crown-engine/tools/level_editor/project_browser.vala

/*
 * Copyright (c) 2012-2026 Daniele Bartolini et al.
 * SPDX-License-Identifier: GPL-3.0-or-later
 */

namespace Crown
{
public const Gtk.TargetEntry[] dnd_targets =
{
	{ "RESOURCE_PATH", Gtk.TargetFlags.SAME_APP, 0 },
};

public string project_path(string type, string name)
{
	if (type == "<folder>")
		return name;

	return ResourceId.path(type, name);
}

// Menu to open when clicking on project's files and folders.
public GLib.Menu? project_entry_menu_create(string type, string name)
{
	GLib.Menu menu = new GLib.Menu();
	GLib.MenuItem mi;

	if (type == "<folder>") {
		if (name == "..")
			return null;

		GLib.Menu import_menu = new GLib.Menu();

		mi = new GLib.MenuItem("Import...", null);
		mi.set_action_and_target_value("app.import", new GLib.Variant.tuple({(string)name, new string[] {}}));
		import_menu.append_item(mi);

		menu.append_section(null, import_menu);

		GLib.Menu create_menu = new GLib.Menu();

		mi = new GLib.MenuItem("New Script...", null);
		mi.set_action_and_target_value("app.create-script", new GLib.Variant.tuple({(string)name, "", true}));
		create_menu.append_item(mi);

		mi = new GLib.MenuItem("New Script (Unit)...", null);
		mi.set_action_and_target_value("app.create-script", new GLib.Variant.tuple({(string)name, "", false}));
		create_menu.append_item(mi);

		mi = new GLib.MenuItem("New Unit...", null);
		mi.set_action_and_target_value("app.create-unit", new GLib.Variant.tuple({(string)name, ""}));
		create_menu.append_item(mi);

		mi = new GLib.MenuItem("New Material...", null);
		mi.set_action_and_target_value("app.create-material", new GLib.Variant.tuple({(string)name, ""}));
		create_menu.append_item(mi);

		mi = new GLib.MenuItem("New Folder...", null);
		mi.set_action_and_target_value("app.create-directory", new GLib.Variant.tuple({(string)name, ""}));
		create_menu.append_item(mi);

		menu.append_section(null, create_menu);

		GLib.Menu destroy_menu = new GLib.Menu();

		if ((string)name != ProjectStore.ROOT_FOLDER) {
			mi = new GLib.MenuItem("Delete Folder", null);
			mi.set_action_and_target_value("app.delete-directory", new GLib.Variant.string((string)name));
			destroy_menu.append_item(mi);
		}

		menu.append_section(null, destroy_menu);
	} else { // If file
		menu = new GLib.Menu();

		mi = new GLib.MenuItem("Delete File", null);
		mi.set_action_and_target_value("app.delete-file", new GLib.Variant.string(project_path(type, name)));
		menu.append_item(mi);

		if (type == OBJECT_TYPE_MESH_SKELETON || type == OBJECT_TYPE_SPRITE) {
			mi = new GLib.MenuItem("New State Machine...", null);
			string skeleton_name;
			if (type == OBJECT_TYPE_SPRITE)
				skeleton_name = "";
			else
				skeleton_name = name;

			mi.set_action_and_target_value("app.create-state-machine", new GLib.Variant.tuple({ResourceId.parent_folder(name), "", skeleton_name}));
			menu.append_item(mi);
		}
	}

	// Add common menu items.
	GLib.Menu common_menu = new GLib.Menu();

	mi = new GLib.MenuItem("Copy Path", null);
	mi.set_action_and_target_value("app.copy-path", new GLib.Variant.string(project_path(type, name)));
	common_menu.append_item(mi);

	mi = new GLib.MenuItem("Copy Name", null);
	mi.set_action_and_target_value("app.copy-name", new GLib.Variant.string(name));
	common_menu.append_item(mi);

	mi = new GLib.MenuItem("Open Containing Folder...", null);
	mi.set_action_and_target_value("app.open-containing", new GLib.Variant.string(name));
	common_menu.append_item(mi);

	if (type != "<folder>" || name != "") {
		mi = new GLib.MenuItem("Add to Favorites", null);
		mi.set_action_and_target_value("app.favorite-resource", new GLib.Variant.tuple({type, name}));
		common_menu.append_item(mi);
	}

	menu.append_section(null, common_menu);

	return menu;
}

// Menu to open when clicking on favorites' entries.
public GLib.Menu? favorites_entry_menu_create(string type, string name)
{
	GLib.Menu menu = new GLib.Menu();
	GLib.MenuItem mi;

	mi = new GLib.MenuItem("Open Containing Folder...", null);
	mi.set_action_and_target_value("app.open-containing", new GLib.Variant.string(name));
	menu.append_item(mi);

	GLib.Menu common_menu = new GLib.Menu();

	mi = new GLib.MenuItem("Copy Path", null);
	string path = project_path(type, name);
	mi.set_action_and_target_value("app.copy-path", new GLib.Variant.string(path));
	common_menu.append_item(mi);

	mi = new GLib.MenuItem("Copy Name", null);
	mi.set_action_and_target_value("app.copy-name", new GLib.Variant.string(name));
	common_menu.append_item(mi);

	mi = new GLib.MenuItem("Remove from Favorites", null);
	mi.set_action_and_target_value("app.unfavorite-resource", new GLib.Variant.tuple({type, name}));
	common_menu.append_item(mi);

	mi = new GLib.MenuItem("Reveal", null);
	mi.set_action_and_target_value("app.reveal-resource", new GLib.Variant.tuple({type, name}));
	common_menu.append_item(mi);

	menu.append_section(null, common_menu);

	return menu;
}

public void set_thumbnail(Gtk.CellRenderer cell, string type, string name, int icon_size, ThumbnailCache thumbnail_cache)
{
	// https://specifications.freedesktop.org/icon-naming-spec/icon-naming-spec-latest.html
	if (type == "<folder>")
		cell.set_property("icon-name", "browser-folder-symbolic");
	else if ((string)type == "<favorites>")
		cell.set_property("icon-name", "browser-favorites");
	else if ((string)type == OBJECT_TYPE_STATE_MACHINE)
		cell.set_property("icon-name", "object-state-machine");
	else if ((string)type == "config")
		cell.set_property("icon-name", "object-config");
	else if ((string)type == OBJECT_TYPE_FONT)
		cell.set_property("icon-name", "object-font");
	else if ((string)type == OBJECT_TYPE_LEVEL)
		cell.set_property("icon-name", "object-level");
	else if ((string)type == OBJECT_TYPE_MATERIAL)
		cell.set_property("pixbuf", thumbnail_cache.get(type, name, icon_size));
	else if ((string)type == OBJECT_TYPE_MESH)
		cell.set_property("icon-name", "object-mesh");
	else if ((string)type == "package")
		cell.set_property("icon-name", "object-package");
	else if ((string)type == "physics_config")
		cell.set_property("icon-name", "object-config");
	else if ((string)type == "render_config")
		cell.set_property("icon-name", "object-config");
	else if ((string)type == "lua")
		cell.set_property("icon-name", "object-script");
	else if ((string)type == OBJECT_TYPE_UNIT)
		cell.set_property("pixbuf", thumbnail_cache.get(type, name, icon_size));
	else if ((string)type == "shader")
		cell.set_property("icon-name", "object-shader");
	else if ((string)type == OBJECT_TYPE_SOUND)
		cell.set_property("pixbuf", thumbnail_cache.get(type, name, icon_size));
	else if ((string)type == OBJECT_TYPE_SPRITE_ANIMATION)
		cell.set_property("icon-name", "object-animation");
	else if ((string)type == OBJECT_TYPE_SPRITE)
		cell.set_property("icon-name", "object-sprite");
	else if ((string)type == OBJECT_TYPE_TEXTURE)
		cell.set_property("pixbuf", thumbnail_cache.get(type, name, icon_size));
	else if ((string)type == OBJECT_TYPE_MESH_ANIMATION)
		cell.set_property("icon-name", "object-animation");
	else if ((string)type == OBJECT_TYPE_MESH_SKELETON)
		cell.set_property("icon-name", "object-skeleton");
	else {
		Project project = thumbnail_cache._project;
		string td = type.down();

		if (project.is_type_image(td))
			cell.set_property("icon-name", "object-texture");
		else if (project.is_type_mesh(td))
			cell.set_property("icon-name", "object-mesh");
		else if (project.is_type_sound(td))
			cell.set_property("icon-name", "object-sound");
		else if (project.is_type_font(td))
			cell.set_property("icon-name", "object-font");
		else
			cell.set_property("icon-name", "text-x-generic-symbolic");
	}
}

public enum BrowseMode
{
	REGULAR, ///< Just browsing resources.
	SEARCH,  ///< Filter resources based on search needle.

	COUNT
}

public class ProjectFolderView : Gtk.Box
{
	public string _selected_type;
	public string _selected_name;
	public ProjectBrowser _project_browser;
	public ProjectStore _project_store;
	public ThumbnailCache _thumbnail_cache;
	public Gtk.ListStore _list_store;
	public Gtk.IconView _icon_view;
	public Gtk.TreeView _list_view;
	public Gtk.CellRendererPixbuf _cell_renderer_pixbuf;
	public Gtk.CellRendererText _cell_renderer_text;
	public Gdk.Pixbuf _empty_pixbuf;
	public bool _showing_project_folder;
	public Gtk.ScrolledWindow _icon_view_window;
	public Gtk.ScrolledWindow _list_view_window;
	public Gtk.GestureMultiPress _icon_view_gesture_click;
	public Gtk.GestureMultiPress _list_view_gesture_click;
	public Gtk.Stack _stack;
	public BrowseMode _browse_mode;

	public ProjectFolderView(ProjectBrowser project_browser, ProjectStore project_store, ThumbnailCache thumbnail_cache)
	{
		Object(orientation: Gtk.Orientation.VERTICAL);

		_project_browser = project_browser;
		_project_store = project_store;
		_thumbnail_cache = thumbnail_cache;

		_list_store = new Gtk.ListStore(4
			, typeof(string)     // ProjectStore.Column.TYPE
			, typeof(string)     // ProjectStore.Column.NAME
			, typeof(uint64)     // ProjectStore.Column.SIZE
			, typeof(uint64)     // ProjectStore.Column.MTIME
			);

		_icon_view = new Gtk.IconView();
		_icon_view.set_model(_list_store);
		_icon_view.set_item_width(80);
		_icon_view.enable_model_drag_source(Gdk.ModifierType.BUTTON1_MASK, dnd_targets, Gdk.DragAction.COPY);
		_icon_view.drag_data_get.connect(on_drag_data_get);
		_icon_view.drag_begin.connect_after(on_drag_begin);
		_icon_view.drag_end.connect(on_drag_end);
		_icon_view.drag_data_received.connect(on_drag_data_received);
		_icon_view.has_tooltip = true;
		_icon_view.query_tooltip.connect(on_icon_view_query_tooltip);

		/*
		_icon_view_gesture_click = new Gtk.GestureMultiPress(_icon_view);
		_icon_view_gesture_click.set_button(0);
		_icon_view_gesture_click.pressed.connect((n_press, x, y) => {
				on_button_pressed(_icon_view_gesture_click.get_current_button(), n_press, x, y);
			});
		*/
		_icon_view.button_press_event.connect((ev) => {
				int n_press = 1;
				if (ev.type == Gdk.EventType.@2BUTTON_PRESS)
					n_press = 2;
				return on_button_pressed(ev.button, n_press, ev.x, ev.y);
			});

		const Gtk.TargetEntry targets[] =
		{
			{ "text/uri-list", 0, 0 },
		};
		_icon_view.enable_model_drag_dest(targets
			, Gdk.DragAction.COPY
			| Gdk.DragAction.MOVE
			);

		// https://gitlab.gnome.org/GNOME/gtk/-/blob/3.24.43/gtk/gtkiconview.c#L5147
		_cell_renderer_text = new Gtk.CellRendererText();
		_cell_renderer_text.set("wrap-mode", Pango.WrapMode.WORD_CHAR);
		_cell_renderer_text.set("alignment", Pango.Alignment.CENTER);
		_cell_renderer_text.set("xalign", 0.5);
		_cell_renderer_text.set("yalign", 0.0);
		int wrap_width = _icon_view.item_width;
		wrap_width -= 2 * _icon_view.item_padding * 2;
		_cell_renderer_text.set("wrap-width", wrap_width);
		_cell_renderer_text.set("width", wrap_width);
		_icon_view.pack_end(_cell_renderer_text, false);
		_icon_view.set_cell_data_func(_cell_renderer_text, icon_view_text_func);

		_cell_renderer_pixbuf = new Gtk.CellRendererPixbuf();
		_cell_renderer_pixbuf.stock_size = Gtk.IconSize.DIALOG;
		_icon_view.pack_start(_cell_renderer_pixbuf, false);
		_icon_view.set_cell_data_func(_cell_renderer_pixbuf, icon_view_pixbuf_func);

		_list_view = new Gtk.TreeView();
		_list_view.set_model(_list_store);
		_list_view.enable_model_drag_source(Gdk.ModifierType.BUTTON1_MASK, dnd_targets, Gdk.DragAction.COPY);
		_list_view.drag_data_get.connect(on_drag_data_get);
		_list_view.drag_begin.connect_after(on_drag_begin);
		_list_view.drag_end.connect(on_drag_end);

		_list_view_gesture_click = new Gtk.GestureMultiPress(_list_view);
		_list_view_gesture_click.set_button(0);
		_list_view_gesture_click.pressed.connect((n_press, x, y) => {
				on_button_pressed(_list_view_gesture_click.get_current_button(), n_press, x, y);
			});

		var cell_pixbuf = new Gtk.CellRendererPixbuf();
		cell_pixbuf.stock_size = Gtk.IconSize.DND;
		var cell_text = new Gtk.CellRendererText();

		Gtk.TreeViewColumn column = null;
		column = new Gtk.TreeViewColumn();
		// column.title = "Thumbnail";
		column.pack_start(cell_pixbuf, false);
		column.set_cell_data_func(cell_pixbuf, list_view_pixbuf_func);
		_list_view.append_column(column);

		column = new Gtk.TreeViewColumn();
		column.title = "Basename";
		column.pack_start(cell_text, true);
		column.set_cell_data_func(cell_text, list_view_basename_text_func);
		_list_view.append_column(column);

		column = new Gtk.TreeViewColumn();
		column.title = "Type";
		column.pack_start(cell_text, true);
		column.set_cell_data_func(cell_text, list_view_type_text_func);
		_list_view.append_column(column);

		column = new Gtk.TreeViewColumn();
		column.title = "Size";
		column.pack_start(cell_text, true);
		column.set_cell_data_func(cell_text, list_view_size_text_func);
		_list_view.append_column(column);

		column = new Gtk.TreeViewColumn();
		column.title = "Modified";
		column.pack_start(cell_text, true);
		column.set_cell_data_func(cell_text, list_view_mtime_text_func);
		_list_view.append_column(column);

		column = new Gtk.TreeViewColumn();
		column.title = "Name";
		column.pack_start(cell_text, true);
		column.set_cell_data_func(cell_text, list_view_name_text_func);
		_list_view.append_column(column);

		_empty_pixbuf = new Gdk.Pixbuf.from_data({ 0x00, 0x00, 0x00, 0x00 }, Gdk.Colorspace.RGB, true, 8, 1, 1, 4);

		_showing_project_folder = true;

		_icon_view_window = new Gtk.ScrolledWindow(null, null);
		_icon_view_window.add(_icon_view);
		_list_view_window = new Gtk.ScrolledWindow(null, null);
		_list_view_window.add(_list_view);

		_stack = new Gtk.Stack();
		_stack.add_named(_icon_view_window, "icon-view");
		_stack.add_named(_list_view_window, "list-view");
		_stack.set_visible_child_full("icon-view", Gtk.StackTransitionType.NONE);

		this.pack_start(_stack);

		_browse_mode = BrowseMode.REGULAR;
	}

	public void on_drag_data_get(Gdk.DragContext context, Gtk.SelectionData data, uint info, uint time_)
	{
		// https://valadoc.org/gtk+-3.0/Gtk.Widget.drag_data_get.html
		Gtk.TreePath path;
		if (!selected_path(out path))
			return;

		string type;
		string name;
		resource_at_path(out type, out name, path);

		string resource_path = ResourceId.path(type, name);
		data.set(Gdk.Atom.intern_static_string("RESOURCE_PATH"), 8, resource_path.data);
	}

	public void on_drag_begin(Gdk.DragContext context)
	{
		// https://valadoc.org/gtk+-3.0/Gtk.Widget.drag_begin.html
		Gtk.drag_set_icon_pixbuf(context, _empty_pixbuf, 0, 0);
	}

	public void on_drag_end(Gdk.DragContext context)
	{
		// https://valadoc.org/gtk+-3.0/Gtk.Widget.drag_end.html
		GLib.Application.get_default().activate_action("cancel-place", null);
	}

	public void on_drag_data_received(Gdk.DragContext context, int x, int y, Gtk.SelectionData selection_data, uint info, uint time_)
	{
		if (_browse_mode == BrowseMode.SEARCH || !_showing_project_folder) {
			Gtk.drag_finish(context, true, false, time_);
			return;
		}

		Gtk.TreePath? path = path_at_pos(x, y);

		if (path != null) {
			_icon_view.select_path(path);
			_icon_view.scroll_to_path(path, false, 0.0f, 0.0f);
		}

		string type;
		string name;
		resource_at_path(out type, out name, path);

		if (type == "<folder>") {
			string[] uris = selection_data.get_uris();
			string[] filenames = new string[uris.length];

			try {
				for (int i = 0; i < uris.length; ++i)
					filenames[i] = GLib.Filename.from_uri(uris[i]);

				GLib.Application.get_default().activate_action("import", new GLib.Variant.tuple({name, filenames}));
			} catch (GLib.ConvertError e) {
				loge(e.message);
			}
		}

		Gtk.drag_finish(context, true, false, time_);
	}

	public bool on_button_pressed(uint button, int n_press, double x, double y)
	{
		Gtk.TreePath? path = path_at_pos((int)x, (int)y);

		if (button == Gdk.BUTTON_SECONDARY) {
			string type;
			string name;

			if (path != null) {
				_icon_view.select_path(path);
				_icon_view.scroll_to_path(path, false, 0.0f, 0.0f);
			} else if (_browse_mode == BrowseMode.SEARCH) {
					return Gdk.EVENT_PROPAGATE;
			}

			resource_at_path(out type, out name, path);

			GLib.Menu? menu_model;
			if (_showing_project_folder)
				menu_model = project_entry_menu_create(type, name);
			else
				menu_model = favorites_entry_menu_create(type, name);

			if (menu_model != null) {
				Gtk.Popover menu = new Gtk.Popover.from_model(this, menu_model);
				if (_stack.get_visible_child() == _icon_view_window) {
					// Adjust for scroll offset since IconView fails to do it itself.
					var new_x = x - _icon_view_window.get_hadjustment().get_value();
					var new_y = y - _icon_view_window.get_vadjustment().get_value();
					menu.set_pointing_to({ (int)new_x, (int)new_y, 1, 1 });
				} else {
					menu.set_pointing_to({ (int)x, (int)y, 1, 1 });
				}
				menu.set_position(Gtk.PositionType.BOTTOM);
				menu.popup();
			}

			return Gdk.EVENT_STOP; // Stop the event. Otherwise, popover menu won't show on _icon_view.
		} else if (button == Gdk.BUTTON_PRIMARY && n_press == 2) {
			if (path != null) {
				string type;
				string name;

				resource_at_path(out type, out name, path);

				if (type == "<folder>") {
					string dir_name;
					if (name == "..")
						dir_name = ResourceId.parent_folder((string)_selected_name);
					else
						dir_name = name;

					GLib.Application.get_default().activate_action("open-directory", new GLib.Variant.string(dir_name));
				} else {
					GLib.Application.get_default().activate_action("open-resource", ResourceId.path(type, name));
				}
			}
		}

		return Gdk.EVENT_PROPAGATE;
	}

	public void icon_view_pixbuf_func(Gtk.CellLayout cell_layout, Gtk.CellRenderer cell, Gtk.TreeModel model, Gtk.TreeIter iter)
	{
		Value val;
		string type;
		string name;
		model.get_value(iter, ProjectStore.Column.TYPE, out val);
		type = (string)val;
		model.get_value(iter, ProjectStore.Column.NAME, out val);
		name = (string)val;

		set_thumbnail(cell, type, name, 64, _thumbnail_cache);
	}

	public void icon_view_text_func(Gtk.CellLayout cell_layout, Gtk.CellRenderer cell, Gtk.TreeModel model, Gtk.TreeIter iter)
	{
		Value type;
		Value name;
		model.get_value(iter, ProjectStore.Column.TYPE, out type);
		model.get_value(iter, ProjectStore.Column.NAME, out name);

		string basename = GLib.Path.get_basename((string)name);

		if ((string)type == "<folder>") {
			if (name == "..")
				cell.set_property("text", name);
			else
				cell.set_property("text", basename);
		} else {
			if (_project_browser._show_files_extension.get_active())
				basename += "." + (string)type;

			cell.set_property("text", basename);
		}
	}

	public void list_view_pixbuf_func(Gtk.CellLayout cell_layout, Gtk.CellRenderer cell, Gtk.TreeModel model, Gtk.TreeIter iter)
	{
		Value val;
		string type;
		string name;
		model.get_value(iter, ProjectStore.Column.TYPE, out val);
		type = (string)val;
		model.get_value(iter, ProjectStore.Column.NAME, out val);
		name = (string)val;

		set_thumbnail(cell, type, name, 32, _thumbnail_cache);
	}

	public void list_view_basename_text_func(Gtk.CellLayout cell_layout, Gtk.CellRenderer cell, Gtk.TreeModel model, Gtk.TreeIter iter)
	{
		Value name;
		model.get_value(iter, ProjectStore.Column.NAME, out name);

		if (name == "..")
			cell.set_property("text", name);
		else
			cell.set_property("text", GLib.Path.get_basename((string)name));
	}

	public void list_view_type_text_func(Gtk.CellLayout cell_layout, Gtk.CellRenderer cell, Gtk.TreeModel model, Gtk.TreeIter iter)
	{
		Value type;
		model.get_value(iter, ProjectStore.Column.TYPE, out type);

		cell.set_property("text", prettify_type((string)type));
	}

	public void list_view_size_text_func(Gtk.CellLayout cell_layout, Gtk.CellRenderer cell, Gtk.TreeModel model, Gtk.TreeIter iter)
	{
		Value val;
		model.get_value(iter, ProjectStore.Column.SIZE, out val);
		uint64 size = (uint64)val;

		if (size != 0)
			cell.set_property("text", prettify_size(size));
		else
			cell.set_property("text", "n/a");
	}

	public void list_view_mtime_text_func(Gtk.CellLayout cell_layout, Gtk.CellRenderer cell, Gtk.TreeModel model, Gtk.TreeIter iter)
	{
		Value type;
		model.get_value(iter, ProjectStore.Column.MTIME, out type);
		uint64 mtime = (uint64)type;

		if (mtime != 0)
			cell.set_property("text", prettify_time(mtime));
		else
			cell.set_property("text", "n/a");
	}

	public void list_view_name_text_func(Gtk.CellLayout cell_layout, Gtk.CellRenderer cell, Gtk.TreeModel model, Gtk.TreeIter iter)
	{
		Value name;
		model.get_value(iter, ProjectStore.Column.NAME, out name);

		if (name == "..")
			cell.set_property("text", "n/a");
		else
			cell.set_property("text", (string)name);
	}

	public void select_resource(string type, string name)
	{
		Gtk.TreePath? path_to_select = null;

		_list_store.foreach((model, path, iter) => {
				GLib.Value val;
				string store_type;
				string store_name;
				model.get_value(iter, ProjectStore.Column.TYPE, out val);
				store_type = (string)val;
				model.get_value(iter, ProjectStore.Column.NAME, out val);
				store_name = (string)val;

				if (store_name == name && store_type == type) {
					path_to_select = path;
					return true;
				}

				return false;
			});

		if (path_to_select != null) {
			_icon_view.select_path(path_to_select);
			_icon_view.scroll_to_path(path_to_select, false, 0.0f, 0.0f);
			_list_view.get_selection().select_path(path_to_select);
			_list_view.scroll_to_cell(path_to_select, null, false, 0.0f, 0.0f);
		}
	}

	public bool selected_path(out Gtk.TreePath? path)
	{
		if (_stack.get_visible_child() == _icon_view_window) {
			GLib.List<Gtk.TreePath> selected_paths = _icon_view.get_selected_items();
			if (selected_paths.length() == 0u) {
				path = null;
				return false;
			}

			path = selected_paths.nth(0).data;
			return true;
		} else if (_stack.get_visible_child() == _list_view_window) {
			Gtk.TreeModel selected_model;
			Gtk.TreeIter iter;
			if (!_list_view.get_selection().get_selected(out selected_model, out iter)) {
				path = null;
				return false;
			}

			path = selected_model.get_path(iter);
			return true;
		} else {
			path = null;
			return false;
		}
	}

	public bool on_icon_view_query_tooltip(int x, int y, bool keyboard_tooltip, Gtk.Tooltip tooltip)
	{
		int bx;
		int by;
		_icon_view.convert_widget_to_bin_window_coords((int)x, (int)y, out bx, out by);
		Gtk.TreePath? path = _icon_view.get_path_at_pos(bx, by);
		if (path == null)
			return false;

		string type;
		string name;
		resource_at_path(out type, out name, path);

		uint64 size;
		uint64 mtime;
		resource_info_at_path(out size, out mtime, path);

		string text = "<b>%s</b>\nType: %s\nSize: %s\nModified: %s".printf(GLib.Markup.escape_text(name)
			, GLib.Markup.escape_text(prettify_type(type))
			, size == 0 ? "n/a" : prettify_size(size)
			, mtime == 0 ? "n/a" : prettify_time(mtime)
			);
		tooltip.set_markup(text);

		return true;
	}

	public static string prettify_type(string type)
	{
		if (type == "<folder>")
			return "Folder";
		else
			return type;
	}

	public static string prettify_size(uint64 size)
	{
		uint64 si_size;
		string si_unit;

		if (size >= 1024*1024*1024) {
			si_size = size / (1024*1024*1024);
			si_unit = "GiB";
		} else if (size >= 1024*1024) {
			si_size = size / (1024*1024);
			si_unit = "MiB";
		} else if (size >= 1024) {
			si_size = size / 1024;
			si_unit = "KiB";
		} else {
			si_size = size;
			si_unit = size > 1 ? "bytes" : "byte";
		}

		return "%d %s".printf((int)si_size, si_unit);
	}

	public static string prettify_time(uint64 time)
	{
		int64 mtime_secs = (int64)(time / (1000*1000*1000));
		GLib.DateTime date_time = new GLib.DateTime.from_unix_local(mtime_secs);
		return date_time.format("%d %b %Y; %H:%M:%S");
	}

	public Gtk.TreePath? path_at_pos(int x, int y)
	{
		Gtk.TreePath? path = null;
		if (_stack.get_visible_child() == _icon_view_window) {
			path = _icon_view.get_path_at_pos(x, y);
		} else if (_stack.get_visible_child() == _list_view_window) {
			int bx;
			int by;
			_list_view.convert_widget_to_bin_window_coords(x, y, out bx, out by);
			if (!_list_view.get_path_at_pos(bx, by, out path, null, null, null))
				path = null;
		} else {
			assert(false);
			return null;
		}

		return path;
	}

	public void resource_at_path(out string type, out string name, Gtk.TreePath? path)
	{
		if (path != null) {
			Gtk.TreeModel model;
			Gtk.TreePath model_path = path_and_model(out model, path);

			Gtk.TreeIter iter;
			model.get_iter(out iter, model_path);

			Value val;
			model.get_value(iter, ProjectStore.Column.TYPE, out val);
			type = (string)val;
			model.get_value(iter, ProjectStore.Column.NAME, out val);
			name = (string)val;
		} else {
			type = _selected_type;
			name = _selected_name;
		}
	}

	public void resource_info_at_path(out uint64 size, out uint64 mtime, Gtk.TreePath? path)
	{
		if (path == null) {
			size = 0;
			mtime = 0;
			return;
		}

		Gtk.TreeModel model;
		Gtk.TreePath model_path = path_and_model(out model, path);

		Gtk.TreeIter iter;
		model.get_iter(out iter, model_path);

		Value val;
		model.get_value(iter, ProjectStore.Column.SIZE, out val);
		size = (uint64)val;
		model.get_value(iter, ProjectStore.Column.MTIME, out val);
		mtime = (uint64)val;
	}

	public void set_browse_mode(BrowseMode mode)
	{
		if (_browse_mode == mode)
			return;

		_browse_mode = mode;
	}

	public Gtk.TreePath path_and_model(out Gtk.TreeModel model, Gtk.TreePath? path)
	{
		model = _list_store;
		return path;
	}
}

public class ProjectBrowser : Gtk.Box
{
	public enum SortMode
	{
		NAME_AZ,
		NAME_ZA,
		TYPE_AZ,
		TYPE_ZA,
		SIZE_MIN_MAX,
		SIZE_MAX_MIN,
		LAST_MTIME,
		FIRST_MTIME,

		COUNT;

		public string to_label()
		{
			switch (this) {
			case NAME_AZ:
				return "Name A-Z";
			case NAME_ZA:
				return "Name Z-A";
			case TYPE_AZ:
				return "Type A-Z";
			case TYPE_ZA:
				return "Type Z-A";
			case SIZE_MIN_MAX:
				return "Size min-Max";
			case SIZE_MAX_MIN:
				return "Size Max-min";
			case LAST_MTIME:
				return "Last Modified";
			case FIRST_MTIME:
				return "First Modified";
			default:
				return "Unknown";
			}
		}
	}

	// Data
	public ProjectStore _project_store;
	public ThumbnailCache _thumbnail_cache;

	// Widgets
	public string _needle;
	public Gtk.EntryBuffer _filter_buffer;
	public EntrySearch _filter_entry_tree;
	public EntrySearch _filter_entry_folder;
	public Gtk.TreeModelFilter _tree_search;
	public Gtk.TreeModelFilter _tree_filter;
	public Gtk.TreeModelSort _tree_sort;
	public Gtk.TreeView _tree_view;
	public Gtk.TreeSelection _tree_selection;
	public Gdk.Pixbuf _empty_pixbuf;
	public ProjectFolderView _folder_view;
	public bool _show_folder_view;
	public Gtk.Image _toggle_folder_view_image;
	public Gtk.Button _toggle_folder_view;
	public Gtk.Box _tree_view_content;
	public Gtk.Image _toggle_icon_view_image;
	public Gtk.Button _toggle_icon_view;
	public Gtk.ListStore _folder_list_store;
	public Gtk.TreeModelSort _folder_list_sort;
	public SortMode _sort_mode;
	public Gtk.CheckButton _show_all_files;
	public Gtk.CheckButton _show_files_extension;
	public Gtk.CheckButton _show_mapped_dirs;
	public Gtk.Box _sort_items_box;
	public Gtk.Popover _sort_items_popover;
	public Gtk.MenuButton _sort_items;
	public Gtk.Box _empty_favorites_box;
	public Gtk.Stack _folder_stack;
	public Gtk.Box _folder_view_content;
	public Gtk.ScrolledWindow _scrolled_window;
	public Gtk.Paned _paned;
	public Gtk.GestureMultiPress _tree_view_gesture_click;

	public bool _hide_core_resources;
	public BrowseMode _browse_mode;

	public ProjectBrowser(ProjectStore project_store, ThumbnailCache thumbnail_cache)
	{
		Object(orientation: Gtk.Orientation.VERTICAL);

		// Data
		_project_store = project_store;
		_thumbnail_cache = thumbnail_cache;
		_thumbnail_cache.changed.connect(() => {
			_tree_view.queue_draw();
			_folder_view.queue_draw();
		});

		_needle = "";

		_filter_buffer = new Gtk.EntryBuffer();

		_filter_entry_tree = new EntrySearch();
		_filter_entry_tree._entry.set_buffer(_filter_buffer);
		_filter_entry_tree.set_placeholder_text("Search...");
		_filter_entry_tree._entry.stop_search.connect(on_stop_search);

		_filter_entry_folder = new EntrySearch();
		_filter_entry_folder._entry.set_buffer(_filter_buffer);
		_filter_entry_folder.set_placeholder_text("Search...");
		_filter_entry_folder.search_changed.connect(on_filter_entry_text_changed);
		_filter_entry_folder._entry.stop_search.connect(on_stop_search);

		_tree_filter = new Gtk.TreeModelFilter(_project_store._tree_store, null);
		_tree_filter.set_visible_func((model, iter) => {
				if (_project_store.project_root_path() != null)
					_tree_view.expand_row(_project_store.project_root_path(), false);

				Value type;
				Value name;
				model.get_value(iter, ProjectStore.Column.TYPE, out type);
				model.get_value(iter, ProjectStore.Column.NAME, out name);

				bool should_show = (string)type != null
					&& (string)name != null
					&& !row_should_be_hidden((string)type, (string)name)
					;

				if (_show_folder_view) {
					// Hide all descendants of the favorites root.
					Gtk.TreePath? path = model.get_path(iter);
					if (path != null && _project_store.favorites_root_path() != null && path.is_descendant(_project_store.favorites_root_path()))
						return false;

					return should_show && (type == "<folder>" || type == "<favorites>");
				} else {
					return should_show;
				}
			});

		_tree_search = new Gtk.TreeModelFilter(_tree_filter, null);
		_tree_search.set_visible_column(ProjectStore.Column.VISIBLE);

		_tree_sort = new Gtk.TreeModelSort.with_model(_tree_search);
		_tree_sort.set_default_sort_func((model, iter_a, iter_b) => {
				Value type_a;
				Value type_b;
				model.get_value(iter_a, ProjectStore.Column.TYPE, out type_a);
				model.get_value(iter_b, ProjectStore.Column.TYPE, out type_b);

				// Favorites is always on top.
				if ((string)type_a == "<favorites>")
					return -1;
				if ((string)type_b == "<favorites>")
					return 1;

				// Then folders.
				if ((string)type_a == "<folder>") {
					if ((string)type_b != "<folder>")
						return -1;
				} else if ((string)type_b == "<folder>") {
					if ((string)type_a != "<folder>")
						return 1;
				}

				// And finally, regular files.
				Value id_a;
				Value id_b;
				model.get_value(iter_a, ProjectStore.Column.NAME, out id_a);
				model.get_value(iter_b, ProjectStore.Column.NAME, out id_b);
				return strcmp(GLib.Path.get_basename((string)id_a), GLib.Path.get_basename((string)id_b));
			});

		Gtk.CellRendererPixbuf cell_pixbuf = new Gtk.CellRendererPixbuf();
		cell_pixbuf.stock_size = Gtk.IconSize.SMALL_TOOLBAR;
		Gtk.CellRendererText cell_text = new Gtk.CellRendererText();
		Gtk.TreeViewColumn column = new Gtk.TreeViewColumn();
		column.pack_start(cell_pixbuf, false);
		column.pack_start(cell_text, true);
		column.set_cell_data_func(cell_pixbuf, pixbuf_func);
		column.set_cell_data_func(cell_text, text_func);
		_tree_view = new Gtk.TreeView();
		_tree_view.append_column(column);
#if 0
		// For debugging.
		_tree_view.insert_column_with_attributes(-1
			, "Segment"
			, new Gtk.CellRendererText()
			, "text"
			, ProjectStore.Column.SEGMENT
			, null
			);
		_tree_view.insert_column_with_attributes(-1
			, "Name"
			, new Gtk.CellRendererText()
			, "text"
			, ProjectStore.Column.NAME
			, null
			);
		_tree_view.insert_column_with_attributes(-1
			, "Type"
			, new Gtk.CellRendererText()
			, "text"
			, ProjectStore.Column.TYPE
			, null
			);
#endif /* if 0 */
		_tree_view.model = _tree_sort;
		_tree_view.headers_visible = false;

		_tree_view_gesture_click = new Gtk.GestureMultiPress(_tree_view);
		_tree_view_gesture_click.set_button(0);
		_tree_view_gesture_click.pressed.connect(on_button_pressed);

		_tree_view.enable_model_drag_source(Gdk.ModifierType.BUTTON1_MASK, dnd_targets, Gdk.DragAction.COPY);
		_tree_view.drag_data_get.connect(on_drag_data_get);
		_tree_view.drag_begin.connect_after(on_drag_begin);
		_tree_view.drag_end.connect(on_drag_end);

		_tree_selection = _tree_view.get_selection();
		_tree_selection.set_mode(Gtk.SelectionMode.BROWSE);
		_tree_selection.changed.connect(() => { update_folder_view(); });

		_empty_pixbuf = new Gdk.Pixbuf.from_data({ 0x00, 0x00, 0x00, 0x00 }, Gdk.Colorspace.RGB, true, 8, 1, 1, 4);

		_project_store._tree_store.row_inserted.connect(on_project_store_row_inserted);
		_project_store._tree_store.row_changed.connect(on_project_store_row_changed);
		_project_store._tree_store.row_deleted.connect(on_project_store_row_deleted);

		// Create icon view.
		_folder_view = new ProjectFolderView(this, _project_store, thumbnail_cache);

		// Create switch button.
		_show_folder_view = true;
		_toggle_folder_view_image = new Gtk.Image.from_icon_name("level-tree-symbolic", Gtk.IconSize.SMALL_TOOLBAR);
		_toggle_folder_view = new Gtk.Button();
		_toggle_folder_view.set_tooltip_text("Tree view.");
		_toggle_folder_view.add(_toggle_folder_view_image);
		_toggle_folder_view.get_style_context().add_class("flat");
		_toggle_folder_view.get_style_context().add_class("image-button");
		_toggle_folder_view.can_focus = false;
		_toggle_folder_view.clicked.connect(() => {
				_show_folder_view = !_show_folder_view;
				_toggle_folder_view.set_tooltip_text(_show_folder_view ? "Tree view." : "Folder view.");

				if (_show_folder_view) { // Switch from regular tree view to folder view.
					// Save the currently selected resource and a path to its parent. Those will be
					// used later, after the tree has been refiltered, to show the correct folder
					// and reveal the selected resource in the icon view.
					string? selected_type = null;
					string? selected_name = null;
					Gtk.TreePath? parent_path = null;
					Gtk.TreeModel selected_model;
					Gtk.TreeIter selected_iter;
					if (_tree_selection.get_selected(out selected_model, out selected_iter)) {
						Value val;
						selected_model.get_value(selected_iter, ProjectStore.Column.TYPE, out val);
						selected_type = (string)val;
						selected_model.get_value(selected_iter, ProjectStore.Column.NAME, out val);
						selected_name = (string)val;

						if (selected_type != "<folder>") {
							Gtk.TreeIter parent_iter;
							if (selected_model.iter_parent(out parent_iter, selected_iter))
								parent_path = _tree_view.model.get_path(parent_iter);
						}
					}

					_tree_filter.refilter();

					if (parent_path != null) {
						_tree_selection.select_path(parent_path);
						_folder_view.select_resource(selected_type, selected_name);
					}

					_folder_view_content.show_all();
					_toggle_folder_view_image.set_from_icon_name("level-tree-symbolic", Gtk.IconSize.SMALL_TOOLBAR);

					_filter_entry_tree.search_changed.disconnect(on_filter_entry_text_changed);
					_filter_entry_folder.search_changed.connect(on_filter_entry_text_changed);
					_filter_entry_tree.hide();
				} else { // Switch from folder view to regular tree view.
					// Save the currently selected resource. This will be used later, after the tree
					// has been refiltered, to reveal the selected resource in the tree view.
					string? selected_type = null;
					string? selected_name = null;

					Gtk.TreePath selected_path;
					if (_folder_view.selected_path(out selected_path))
						_folder_view.resource_at_path(out selected_type, out selected_name, selected_path);

					_tree_filter.refilter();

					// Expand filtered tree to match regular filtering behavior.
					if (_browse_mode == BrowseMode.SEARCH)
						_tree_view.expand_all();

					if (selected_type != null && selected_type != "<folder>")
						select_resource(selected_type, selected_name);

					_folder_view_content.hide();
					_toggle_folder_view_image.set_from_icon_name("browser-icon-view", Gtk.IconSize.SMALL_TOOLBAR);

					_tree_view.queue_draw(); // It doesn't draw by itself sometimes...

					_filter_entry_folder.search_changed.disconnect(on_filter_entry_text_changed);
					_filter_entry_tree.search_changed.connect(on_filter_entry_text_changed);
					_filter_entry_tree.show();
				}
			});

		// Create paned split-view.
		_scrolled_window = new Gtk.ScrolledWindow(null, null);
		_scrolled_window.add(_tree_view);

		var _tree_view_control = new Gtk.Box(Gtk.Orientation.HORIZONTAL, 0);
		_tree_view_control.pack_start(_filter_entry_tree, true, true);
		_tree_view_control.pack_end(_toggle_folder_view, false, false);

		_tree_view_content = new Gtk.Box(Gtk.Orientation.VERTICAL, 0);
		_tree_view_content.pack_start(_tree_view_control, false);
		_tree_view_content.pack_start(_scrolled_window, true, true);

		// Setup sort menu button popover.
		_sort_items_box = new Gtk.Box(Gtk.Orientation.VERTICAL, 0);

		Gtk.RadioButton? button = null;
		for (int i = 0; i < SortMode.COUNT; ++i)
			button = add_sort_item(button, (SortMode)i);

		_show_all_files = new Gtk.CheckButton.with_label("Show all files");
		_show_all_files.set_tooltip_text("Show all files, not just resource files.");
		_show_all_files.set_active(false);
		_show_all_files.toggled.connect(on_show_all_files_toggled);

		_show_files_extension = new Gtk.CheckButton.with_label("Show files extension");
		_show_files_extension.set_tooltip_text("Do not hide files extension.");
		_show_files_extension.set_active(false);
		_show_files_extension.toggled.connect(on_show_files_extension_toggled);

		_show_mapped_dirs = new Gtk.CheckButton.with_label("Show mapped dirs");
		_show_mapped_dirs.set_tooltip_text("Show external mapped directories.");
		_show_mapped_dirs.set_active(false);
		_show_mapped_dirs.toggled.connect(on_show_mapped_dirs_toggled);

		_sort_items_box.pack_start(_show_mapped_dirs, false, false);
		_sort_items_box.pack_start(_show_all_files, false, false);
		_sort_items_box.pack_start(_show_files_extension, false, false);
		_sort_items_box.show_all();

		_sort_items_popover = new Gtk.Popover(null);
		_sort_items_popover.add(_sort_items_box);
		_sort_items = new Gtk.MenuButton();
		_sort_items.set_tooltip_text("Sort and filter items.");
		_sort_items.add(new Gtk.Image.from_icon_name("list-sort", Gtk.IconSize.SMALL_TOOLBAR));
		_sort_items.get_style_context().add_class("flat");
		_sort_items.get_style_context().add_class("image-button");
		_sort_items.can_focus = false;
		_sort_items.set_popover(_sort_items_popover);

		bool _show_icon_view = true;
		_toggle_icon_view_image = new Gtk.Image.from_icon_name("browser-list-view", Gtk.IconSize.SMALL_TOOLBAR);
		_toggle_icon_view = new Gtk.Button();
		_toggle_icon_view.set_tooltip_text("List view.");
		_toggle_icon_view.add(_toggle_icon_view_image);
		_toggle_icon_view.get_style_context().add_class("flat");
		_toggle_icon_view.get_style_context().add_class("image-button");
		_toggle_icon_view.can_focus = false;
		_toggle_icon_view.clicked.connect(() => {
				Gtk.TreePath path;
				bool any_selected = _folder_view.selected_path(out path);

				if (_show_icon_view) {
					if (any_selected) {
						Gtk.TreeIter iter;
						_folder_view._list_store.get_iter(out iter, path);
						_folder_view._list_view.get_selection().select_iter(iter);
					}

					_folder_view._stack.set_visible_child_full("list-view", Gtk.StackTransitionType.NONE);
					_toggle_icon_view_image.set_from_icon_name("browser-icon-view", Gtk.IconSize.SMALL_TOOLBAR);
				} else {
					if (any_selected)
						_folder_view._icon_view.select_path(path);

					_folder_view._stack.set_visible_child_full("icon-view", Gtk.StackTransitionType.NONE);
					_toggle_icon_view_image.set_from_icon_name("browser-list-view", Gtk.IconSize.SMALL_TOOLBAR);
				}

				_show_icon_view = !_show_icon_view;
				_toggle_icon_view.set_tooltip_text(_show_icon_view ? "List view." : "Icon view.");
			});

		var _folder_view_control = new Gtk.Box(Gtk.Orientation.HORIZONTAL, 0);
		_folder_view_control.pack_start(_filter_entry_folder, true, true);
		_folder_view_control.pack_end(_toggle_icon_view, false, false);
		_folder_view_control.pack_end(_sort_items, false, false);

		_empty_favorites_box = new Gtk.Box(Gtk.Orientation.VERTICAL, 0);
		_empty_favorites_box.valign = Gtk.Align.CENTER;
		_empty_favorites_box.pack_start(new Gtk.Image.from_icon_name("browser-favorites", Gtk.IconSize.DIALOG), false, false);
		_empty_favorites_box.pack_start(new Gtk.Label("Favorites is empty"), false, false);

		_folder_stack = new Gtk.Stack();
		_folder_stack.add_named(_folder_view, "folder-view");
		_folder_stack.add_named(_empty_favorites_box, "empty-favorites");
		_folder_stack.set_visible_child_full("folder-view", Gtk.StackTransitionType.NONE);

		_folder_view_content = new Gtk.Box(Gtk.Orientation.VERTICAL, 0);
		_folder_view_content.pack_start(_folder_view_control, false);
		_folder_view_content.pack_start(_folder_stack, true, true);

		_paned = new Gtk.Paned(Gtk.Orientation.VERTICAL);
		_paned.pack1(_tree_view_content, true, false);
		_paned.pack2(_folder_view_content, true, false);
		_paned.set_position(400);

		_hide_core_resources = true;
		_browse_mode = BrowseMode.REGULAR;
		_folder_view.set_browse_mode(_browse_mode);

		_folder_list_store = new Gtk.ListStore(4
			, typeof(string) // ProjectStore.Column.TYPE
			, typeof(string) // ProjectStore.Column.NAME
			, typeof(uint64) // ProjectStore.Column.SIZE
			, typeof(uint64) // ProjectStore.Column.MTIME
			);

		_folder_list_sort = new Gtk.TreeModelSort.with_model(_folder_list_store);
		_folder_list_sort.set_default_sort_func((model, iter_a, iter_b) => {
				Value type_a;
				Value type_b;
				model.get_value(iter_a, ProjectStore.Column.TYPE, out type_a);
				model.get_value(iter_b, ProjectStore.Column.TYPE, out type_b);
				Value name_a;
				Value name_b;
				model.get_value(iter_a, ProjectStore.Column.NAME, out name_a);
				model.get_value(iter_b, ProjectStore.Column.NAME, out name_b);

				// Folders are always on top.
				if ((string)type_a == "<folder>" && (string)type_b != "<folder>") {
					return -1;
				} else if ((string)type_a != "<folder>" && (string)type_b == "<folder>") {
					return 1;
				} else if ((string)type_a == "<folder>" && (string)type_b == "<folder>") {
					// Special folders always first.
					if ((string)name_a == "..")
						return -1;
					else if ((string)name_b == "..")
						return 1;
				}

				switch (_sort_mode) {
				case SortMode.NAME_AZ:
				case SortMode.NAME_ZA: {
					int cmp = strcmp((string)name_a, (string)name_b);
					return _sort_mode == SortMode.NAME_AZ ? cmp : -cmp;
				}

				case SortMode.TYPE_AZ:
				case SortMode.TYPE_ZA: {
					int cmp = strcmp((string)type_a, (string)type_b);
					return _sort_mode == SortMode.TYPE_AZ ? cmp : -cmp;

				}

				case SortMode.SIZE_MIN_MAX:
				case SortMode.SIZE_MAX_MIN: {
					Value size_a;
					Value size_b;
					model.get_value(iter_a, ProjectStore.Column.SIZE, out size_a);
					model.get_value(iter_b, ProjectStore.Column.SIZE, out size_b);

					int cmp = (uint64)size_a <= (uint64)size_b ? -1 : 1;
					return _sort_mode == SortMode.SIZE_MIN_MAX ? cmp : -cmp;
				}

				case SortMode.LAST_MTIME:
				case SortMode.FIRST_MTIME: {
					Value mtime_a;
					Value mtime_b;
					model.get_value(iter_a, ProjectStore.Column.MTIME, out mtime_a);
					model.get_value(iter_b, ProjectStore.Column.MTIME, out mtime_b);

					int cmp = (uint64)mtime_a >= (uint64)mtime_b ? -1 : 1;
					return _sort_mode == SortMode.LAST_MTIME ? cmp : -cmp;
				}

				default:
					return 0;
				}
			});

		// Actions.
		GLib.ActionEntry[] action_entries =
		{
			{ "open-directory",      on_open_directory,      "s",    null },
			{ "favorite-resource",   on_favorite_resource,   "(ss)", null },
			{ "unfavorite-resource", on_unfavorite_resource, "(ss)", null }
		};
		GLib.Application.get_default().add_action_entries(action_entries, this);

		this.pack_start(_paned);
		this.show.connect(on_show);
	}

	public void on_show()
	{
		_filter_entry_tree.set_visible(!_show_folder_view);
	}

	public void on_drag_data_get(Gdk.DragContext context, Gtk.SelectionData data, uint info, uint time_)
	{
		// https://valadoc.org/gtk+-3.0/Gtk.Widget.drag_data_get.html
		Gtk.TreeModel selected_model;
		Gtk.TreeIter selected_iter;
		if (!_tree_selection.get_selected(out selected_model, out selected_iter))
			return;

		Value val;
		string type;
		string name;
		selected_model.get_value(selected_iter, ProjectStore.Column.TYPE, out val);
		type = (string)val;
		selected_model.get_value(selected_iter, ProjectStore.Column.NAME, out val);
		name = (string)val;

		string resource_path = ResourceId.path(type, name);
		data.set(Gdk.Atom.intern_static_string("RESOURCE_PATH"), 8, resource_path.data);
	}

	public void on_drag_begin(Gdk.DragContext context)
	{
		// https://valadoc.org/gtk+-3.0/Gtk.Widget.drag_begin.html
		Gtk.drag_set_icon_pixbuf(context, _empty_pixbuf, 0, 0);
	}

	public void on_drag_end(Gdk.DragContext context)
	{
		// https://valadoc.org/gtk+-3.0/Gtk.Widget.drag_end.html
		GLib.Application.get_default().activate_action("cancel-place", null);
	}

	// Returns true if the row should be hidden.
	public bool row_should_be_hidden(string type, string name)
	{
		if (_hide_core_resources) {
			if (type == "<folder>") {
				if (name == "core")
					return true;
			} else {
				if (name.has_prefix("core/"))
					return true;
			}
		}

		if (_show_all_files.get_active())
			return false;

		return type == "importer_settings"
			|| name == Project.LEVEL_EDITOR_TEST_NAME
			|| _project_store._project.is_type_importable(type)
			;
	}

	public void select_resource(string type, string name)
	{
		string parent_type = type;
		string parent_name = name;
		Gtk.TreePath filter_path = null;

		do {
			Gtk.TreePath store_path;
			if (!_project_store.path_for_resource_type_name(out store_path, parent_type, parent_name)) {
				break;
			}

			filter_path = _tree_filter.convert_child_path_to_path(store_path);
			if (filter_path == null) {
				// Either the path is not valid or points to a non-visible row in the model.
				parent_type = "<folder>";
				parent_name = ResourceId.parent_folder(parent_name);
				continue;
			}

			Gtk.TreePath search_path = _tree_search.convert_child_path_to_path(filter_path);
			if (search_path == null) {
				// Either the path is not valid or points to a non-visible row in the model.
				break;
			}

			Gtk.TreePath sort_path = _tree_sort.convert_child_path_to_path(search_path);
			if (sort_path == null) {
				// The path is not valid.
				break;
			}

			_tree_view.expand_to_path(sort_path);
			_tree_view.get_selection().select_path(sort_path);
			_tree_view.scroll_to_cell(sort_path, null, false, 0.0f, 0.0f);
		} while (filter_path == null);
	}

	public void reveal(string type, string name)
	{
		exit_search();

		if (name.has_prefix("core/"))
			_show_mapped_dirs.set_active(true);


		select_resource(type, name);
		_folder_view.select_resource(type, name);
	}

	public void on_open_directory(GLib.SimpleAction action, GLib.Variant? param)
	{
		string dir_name = param.get_string();

		if (dir_name.has_prefix("core/") || dir_name == "core") {
			_hide_core_resources = false;
			_tree_filter.refilter();
		}

		Gtk.TreePath store_path;
		if (_project_store.path_for_resource_type_name(out store_path, "<folder>", dir_name)) {
			Gtk.TreePath filter_path = _tree_filter.convert_child_path_to_path(store_path);
			if (filter_path == null) // Either the path is not valid or points to a non-visible row in the model.
				return;
			Gtk.TreePath sort_path = _tree_sort.convert_child_path_to_path(filter_path);
			if (sort_path == null) // The path is not valid.
				return;

			_tree_view.expand_to_path(sort_path);
			_tree_view.get_selection().select_path(sort_path);
		}
	}

	public void on_favorite_resource(GLib.SimpleAction action, GLib.Variant? param)
	{
		string type = (string)param.get_child_value(0);
		string name = (string)param.get_child_value(1);

		_project_store.add_to_favorites(type, name);
	}

	public void on_unfavorite_resource(GLib.SimpleAction action, GLib.Variant? param)
	{
		string type = (string)param.get_child_value(0);
		string name = (string)param.get_child_value(1);

		_project_store.remove_from_favorites(type, name);
	}

	public void on_button_pressed(int n_press, double x, double y)
	{
		int bx;
		int by;
		Gtk.TreePath path;
		_tree_view.convert_widget_to_bin_window_coords((int)x, (int)y, out bx, out by);
		if (!_tree_view.get_path_at_pos(bx, by, out path, null, null, null))
			return;

		uint button = _tree_view_gesture_click.get_current_button();

		if (button == Gdk.BUTTON_SECONDARY) {
			Gtk.TreeIter iter;
			_tree_view.model.get_iter(out iter, path);

			Value type;
			Value name;
			_tree_view.model.get_value(iter, ProjectStore.Column.TYPE, out type);
			_tree_view.model.get_value(iter, ProjectStore.Column.NAME, out name);

			Gtk.TreePath? filter_path = _tree_sort.convert_path_to_child_path(path);
			Gtk.TreePath? search_path = _tree_search.convert_path_to_child_path(filter_path);
			Gtk.TreePath? store_path = _tree_filter.convert_path_to_child_path(search_path);
			GLib.Menu? menu_model;
			if (store_path.is_descendant(_project_store.project_root_path()) || store_path.compare(_project_store.project_root_path()) == 0)
				menu_model = project_entry_menu_create((string)type, (string)name);
			else if (store_path.is_descendant(_project_store.favorites_root_path()))
				menu_model = favorites_entry_menu_create((string)type, (string)name);
			else
				menu_model = null;

			if (menu_model != null) {
				Gtk.Popover menu = new Gtk.Popover.from_model(_tree_view, menu_model);
				menu.set_pointing_to({ (int)x, (int)y, 1, 1 });
				menu.set_position(Gtk.PositionType.BOTTOM);
				menu.popup();
			}
		} else if (button == Gdk.BUTTON_PRIMARY && n_press == 2) {
			Gtk.TreeIter iter;
			_tree_view.model.get_iter(out iter, path);

			Value type;
			_tree_view.model.get_value(iter, ProjectStore.Column.TYPE, out type);
			if ((string)type == "<folder>")
				return;

			Value name;
			_tree_view.model.get_value(iter, ProjectStore.Column.NAME, out name);

			GLib.Application.get_default().activate_action("open-resource", ResourceId.path((string)type, (string)name));
		}

		return;
	}

	public void update_folder_view()
	{
		_folder_list_store.clear();
		_folder_view._list_store.clear();

		if (_browse_mode == BrowseMode.REGULAR) {
			// Get the selected node's type and name.
			Gtk.TreeModel selected_model;
			Gtk.TreeIter selected_iter;
			if (!_tree_selection.get_selected(out selected_model, out selected_iter))
				return;

			string selected_type;
			string selected_name;
			Value val;
			selected_model.get_value(selected_iter, ProjectStore.Column.TYPE, out val);
			selected_type = (string)val;
			selected_model.get_value(selected_iter, ProjectStore.Column.NAME, out val);
			selected_name = (string)val;

			if (selected_type == "<folder>") {
				_folder_view._showing_project_folder = true;

				// Add parent folder.
				if (selected_name != "") {
					Gtk.TreeIter dummy;
					_folder_list_store.insert_with_values(out dummy
						, -1
						, ProjectStore.Column.TYPE
						, "<folder>"
						, ProjectStore.Column.NAME
						, ".."
						, ProjectStore.Column.SIZE
						, 0u
						, ProjectStore.Column.MTIME
						, 0u
						, -1
						);
				}

				// Fill the intermediate icon view list with paths matching the selected node's name.
				_project_store._list_store.foreach((model, path, iter) => {
						string type;
						string name;
						model.get_value(iter, ProjectStore.Column.TYPE, out val);
						type = (string)val;
						model.get_value(iter, ProjectStore.Column.NAME, out val);
						name = (string)val;

						if (row_should_be_hidden(type, name))
							return false;

						// Skip paths without common ancestor.
						if (ResourceId.parent_folder(name) != selected_name)
							return false;

						// Skip paths that are too deep in the hierarchy:
						// selected_name: foo
						// hierarchy:
						//   foo/bar OK
						//   foo/baz OK
						//   foo/bar/baz NOPE
						string name_suffix;
						if (selected_name == "") // Project folder.
							name_suffix = name.substring((selected_name).length);
						else if (selected_name != name) // Folder itself.
							name_suffix = name.substring((selected_name).length + 1);
						else
							return false;

						if (name_suffix.index_of_char('/') != -1)
							return false;

						uint64 size;
						uint64 mtime;
						model.get_value(iter, ProjectStore.Column.SIZE, out val);
						size = (uint64)val;
						model.get_value(iter, ProjectStore.Column.MTIME, out val);
						mtime = (uint64)val;

						// Add the path to the list.
						Gtk.TreeIter dummy;
						_folder_list_store.insert_with_values(out dummy
							, -1
							, ProjectStore.Column.TYPE
							, type
							, ProjectStore.Column.NAME
							, name
							, ProjectStore.Column.SIZE
							, size
							, ProjectStore.Column.MTIME
							, mtime
							, -1
							);
						return false;
					});

				_folder_view._selected_type = selected_type;
				_folder_view._selected_name = selected_name;

				_folder_stack.set_visible_child_full("folder-view", Gtk.StackTransitionType.NONE);
			} else if (selected_type == "<favorites>") {
				_folder_view._showing_project_folder = false;
				int num_items = 0;

				// Fill the icon view list with paths whose ancestor is the favorites root.
				_project_store._tree_store.foreach((model, path, iter) => {
						string type;
						string name;
						model.get_value(iter, ProjectStore.Column.TYPE, out val);
						type = (string)val;
						model.get_value(iter, ProjectStore.Column.NAME, out val);
						name = (string)val;

						if (!path.is_descendant(_project_store.favorites_root_path()))
							return false;

						uint64 size;
						uint64 mtime;
						model.get_value(iter, ProjectStore.Column.SIZE, out val);
						size = (uint64)val;
						model.get_value(iter, ProjectStore.Column.MTIME, out val);
						mtime = (uint64)val;

						// Add the path to the list.
						Gtk.TreeIter dummy;
						_folder_list_store.insert_with_values(out dummy
							, -1
							, ProjectStore.Column.TYPE
							, type
							, ProjectStore.Column.NAME
							, name
							, ProjectStore.Column.SIZE
							, size
							, ProjectStore.Column.MTIME
							, mtime
							, -1
							);
						++num_items;
						return false;
					});

					if (num_items == 0)
						_folder_stack.set_visible_child_full("empty-favorites", Gtk.StackTransitionType.NONE);
					else
						_folder_stack.set_visible_child_full("folder-view", Gtk.StackTransitionType.NONE);
			}
		} else if (_browse_mode == BrowseMode.SEARCH) {
			// Fill the intermediate icon view list with paths that matches search criteria.
			_project_store._list_store.foreach((model, path, iter) => {
					Value val;
					bool visible;
					model.get_value(iter, ProjectStore.Column.VISIBLE, out val);
					visible = (bool)val;

					if (!visible)
						return false;

					string type;
					string name;
					model.get_value(iter, ProjectStore.Column.TYPE, out val);
					type = (string)val;
					model.get_value(iter, ProjectStore.Column.NAME, out val);
					name = (string)val;

					if (type == "<folder>")
						return false;

					if (row_should_be_hidden(type, name))
						return false;

					uint64 size;
					uint64 mtime;
					model.get_value(iter, ProjectStore.Column.SIZE, out val);
					size = (uint64)val;
					model.get_value(iter, ProjectStore.Column.MTIME, out val);
					mtime = (uint64)val;

					// Add the path to the list.
					Gtk.TreeIter dummy;
					_folder_list_store.insert_with_values(out dummy
						, -1
						, ProjectStore.Column.TYPE
						, type
						, ProjectStore.Column.NAME
						, name
						, ProjectStore.Column.SIZE
						, size
						, ProjectStore.Column.MTIME
						, mtime
						, -1
						);
					return false;
				});
		}

		// Now, fill the actual icon view list with correctly sorted paths.
		_folder_list_sort.foreach((model, path, iter) => {
				Value val;
				string type;
				string name;
				uint64 size;
				uint64 mtime;
				model.get_value(iter, ProjectStore.Column.TYPE, out val);
				type = (string)val;
				model.get_value(iter, ProjectStore.Column.NAME, out val);
				name = (string)val;
				model.get_value(iter, ProjectStore.Column.SIZE, out val);
				size = (uint64)val;
				model.get_value(iter, ProjectStore.Column.MTIME, out val);
				mtime = (uint64)val;

				// Add the path to the list.
				Gtk.TreeIter dummy;
				_folder_view._list_store.insert_with_values(out dummy
					, -1
					, ProjectStore.Column.TYPE
					, type
					, ProjectStore.Column.NAME
					, name
					, ProjectStore.Column.SIZE
					, size
					, ProjectStore.Column.MTIME
					, mtime
					, -1
					);
				return false;
			});
	}

	public void select_project_root()
	{
		Gtk.TreePath? filter_path = _tree_filter.convert_child_path_to_path(_project_store.project_root_path());
		if (filter_path == null)
			return;

		Gtk.TreePath? sort_path = _tree_sort.convert_child_path_to_path(filter_path);
		if (sort_path == null)
			return;

		_tree_selection.select_path(sort_path);
	}

	public void pixbuf_func(Gtk.CellLayout cell_layout, Gtk.CellRenderer cell, Gtk.TreeModel model, Gtk.TreeIter iter)
	{
		Value val;
		string type;
		string name;
		model.get_value(iter, ProjectStore.Column.TYPE, out val);
		type = (string)val;
		model.get_value(iter, ProjectStore.Column.NAME, out val);
		name = (string)val;

		set_thumbnail(cell, type, name, 16, _thumbnail_cache);
	}

	public void text_func(Gtk.CellLayout cell_layout, Gtk.CellRenderer cell, Gtk.TreeModel model, Gtk.TreeIter iter)
	{
		Value name;
		Value type;
		model.get_value(iter, ProjectStore.Column.NAME, out name);
		model.get_value(iter, ProjectStore.Column.TYPE, out type);

		string basename = GLib.Path.get_basename((string)name);

		if ((string)type == "<folder>") {
			if ((string)name == "")
				cell.set_property("text", _project_store._project.name());
			else
				cell.set_property("text", basename);
		} else if ((string)type == "<favorites>") {
			cell.set_property("text", "Favorites");
		} else {
			cell.set_property("text", ResourceId.path((string)type, basename));
		}
	}

	public Gtk.RadioButton add_sort_item(Gtk.RadioButton? group, SortMode mode)
	{
		var button = new Gtk.RadioButton.with_label_from_widget(group, mode.to_label());
		button.toggled.connect(() => {
				_sort_mode = mode;
				update_folder_view();
				_sort_items_popover.popdown();
			});
		_sort_items_box.pack_start(button, false, false);
		return button;
	}

	public bool save_tree_state(Gtk.TreeModel model, Gtk.TreePath path, Gtk.TreeIter iter)
	{
		Gtk.TreePath filter_path = _tree_filter.convert_child_path_to_path(path);
		if (filter_path == null) {
			// Either the path is not valid or points to a non-visible row in the model.
			return false;
		}

		Gtk.TreePath search_path = _tree_search.convert_child_path_to_path(filter_path);
		if (search_path == null) {
			// Either the path is not valid or points to a non-visible row in the model.
			assert(false);
			return false;
		}

		Gtk.TreePath sort_path = _tree_sort.convert_child_path_to_path(search_path);
		if (sort_path == null) {
			// The path is not valid.
			assert(false);
			return false;
		}

		bool expanded = _tree_view.is_row_expanded(sort_path);
		bool selected = _tree_view.get_selection().path_is_selected(sort_path);

		uint32 user_data = 0;
		user_data |= (uint32)expanded << 0;
		user_data |= (uint32)selected << 1;
		_project_store._tree_store.set(iter, ProjectStore.Column.USER_DATA, user_data, -1);

#if false // For debugging.
		if (expanded || selected) {
			Value val;
			_project_store._tree_store.get_value(iter, ProjectStore.Column.NAME, out val);
			logi("is expanded %d selected %d name %s user_data %x".printf((int)expanded, (int)selected, (string)val, user_data));
		}
#endif

		return false; // Continue iterating.
	}

	public bool restore_tree_state(Gtk.TreeModel model, Gtk.TreePath path, Gtk.TreeIter iter)
	{
		uint32 user_data;
		Value val;
		_project_store._tree_store.get_value(iter, ProjectStore.Column.USER_DATA, out val);
		user_data = (uint32)val;

		bool expanded = (bool)((user_data & 0x1) >> 0);
		bool selected = (bool)((user_data & 0x2) >> 1);

#if false // For debugging.
		if (expanded || selected) {
			_project_store._tree_store.get_value(iter, ProjectStore.Column.NAME, out val);
			logi("was expanded %d selected %d name %s user_data %x".printf((int)expanded, (int)selected, (string)val, user_data));
		}
#endif

		Gtk.TreePath filter_path = _tree_filter.convert_child_path_to_path(path);
		if (filter_path == null) {
			// Either the path is not valid or points to a non-visible row in the model.
			return false;
		}

		Gtk.TreePath search_path = _tree_search.convert_child_path_to_path(filter_path);
		if (search_path == null) {
			// Either the path is not valid or points to a non-visible row in the model.
			return false;
		}

		Gtk.TreePath sort_path = _tree_sort.convert_child_path_to_path(search_path);
		if (sort_path == null) {
			// The path is not valid.
			return false;
		}

		if (expanded)
			_tree_view.expand_to_path(sort_path);
		else
			_tree_view.collapse_row(sort_path);

		if (selected)
			_tree_view.get_selection().select_path(sort_path);

		return false; // Continue iterating.
	}

	public void filter(string needle)
	{
		_project_store.make_visible(false);
		_project_store.filter(needle);
		_tree_search.refilter();
		_tree_view.expand_all();
	}

	public void exit_search()
	{
		uint8 empty[] = { '\0' };
		_filter_buffer.set_text(empty);
	}

	public void on_search_started()
	{
		assert(_browse_mode == BrowseMode.REGULAR);

		_browse_mode = BrowseMode.SEARCH;
		_folder_view.set_browse_mode(_browse_mode);

		_folder_stack.set_visible_child_full("folder-view", Gtk.StackTransitionType.NONE);

		disconnect_project_store_signals();

		// Save the current tree state (expanded branches + selection)
		// to restore it later when the search is done.
		_project_store._tree_store.foreach(save_tree_state);
		filter(_needle);
		update_folder_view();

		connect_project_store_signals();
	}

	public void on_search_changed()
	{
		assert(_browse_mode == BrowseMode.SEARCH);
		disconnect_project_store_signals();
		filter(_needle);
		update_folder_view();
		connect_project_store_signals();
	}

	public void on_search_stopped()
	{
		assert(_browse_mode == BrowseMode.SEARCH);
		_browse_mode = BrowseMode.REGULAR;
		_folder_view.set_browse_mode(_browse_mode);

		Gtk.TreeModel selected_model;
		Gtk.TreeIter selected_iter;
		Gtk.TreeRowReference? selected_reference = null;
		// Only restore the old selection if it has not been
		// modified while searching (i.e. nothing is selected
		// because entering search clears it).
		if (_tree_view.get_selection().get_selected(out selected_model, out selected_iter))
			selected_reference = new Gtk.TreeRowReference(selected_model, selected_model.get_path(selected_iter));

		disconnect_project_store_signals();
		_project_store.make_visible(true);
		_tree_search.refilter();

		// Restore the previous tree state (old expanded branches + old selection).
		_project_store._tree_store.foreach(restore_tree_state);
		update_folder_view();
		connect_project_store_signals();

		// If the selection changed while searching, restore it as well.
		if (selected_reference != null) {
			Gtk.TreePath path = selected_reference.get_path();
			_tree_view.expand_to_path(path);
			_tree_view.get_selection().select_path(path);
			_tree_view.scroll_to_cell(path, null, false, 0.0f, 0.0f);
		}
	}

	public void on_stop_search()
	{
		exit_search();
	}

	public void on_filter_entry_text_changed()
	{
		string old_needle = _needle;
		_needle = _filter_buffer.text.strip().down();

		if (old_needle == "" && _needle != "") {
			on_search_started();
		} else if (old_needle != "" && _needle == "") {
			on_search_stopped();
		} else if (_needle != "") {
			on_search_changed();
		}
	}

	void disconnect_project_store_signals()
	{
		_project_store._tree_store.row_inserted.disconnect(on_project_store_row_inserted);
		_project_store._tree_store.row_changed.disconnect(on_project_store_row_changed);
		_project_store._tree_store.row_deleted.disconnect(on_project_store_row_deleted);
	}

	void connect_project_store_signals()
	{
		_project_store._tree_store.row_inserted.connect(on_project_store_row_inserted);
		_project_store._tree_store.row_changed.connect(on_project_store_row_changed);
		_project_store._tree_store.row_deleted.connect(on_project_store_row_deleted);
	}

	void filter_and_update_folder_view()
	{
		if (_browse_mode == BrowseMode.SEARCH) {
			disconnect_project_store_signals();
			filter(_needle);
			connect_project_store_signals();
		}

		update_folder_view();
	}

	void on_project_store_row_inserted(Gtk.TreePath path, Gtk.TreeIter iter)
	{
		filter_and_update_folder_view();
	}

	void on_project_store_row_changed(Gtk.TreePath path, Gtk.TreeIter iter)
	{
		filter_and_update_folder_view();
	}

	void on_project_store_row_deleted(Gtk.TreePath path)
	{
		filter_and_update_folder_view();
	}

	void on_show_all_files_toggled()
	{
		_tree_filter.refilter();
		update_folder_view();
	}

	void on_show_mapped_dirs_toggled()
	{
		_hide_core_resources = !_hide_core_resources;
		_tree_filter.refilter();
		update_folder_view();
	}

	void on_show_files_extension_toggled()
	{
		update_folder_view();
	}
}

} /* namespace Crown */