Add QuickLoad option to resource picker.

When clicking on a resource field in the inspector dock, you now have
the "Quick Load" option in addition to "Load". This opens a QuickOpen
dialog allowing the user to type in a phrase to quickly locate the
desired resource (similar to "Quick Open Scene").

In my experience, this is much faster than clicking through the File
Dialog.

Relates to godotengine/godot-proposals#346.

(cherry picked from commit 470b94fe22b83fb97bb5132a1e4855cd196c956d)

editor/editor_resource_picker.cpp

@@ -137,6 +137,10 @@ void EditorResourcePicker::_file_selected(const String &p_path) {
 	_update_resource();
 }
 
+void EditorResourcePicker::_file_quick_selected() {
+	_file_selected(quick_open->get_selected());
+}
+
 void EditorResourcePicker::_update_menu() {
 	_update_menu_items();
 
@@ -154,7 +158,10 @@ void EditorResourcePicker::_update_menu_items() {
 	// Add options for creating specific subtypes of the base resource type.
 	set_create_options(edit_menu);
 
-	// Add an option to load a resource from a file.
+	// Add an option to load a resource from a file using the QuickOpen dialog.
+	edit_menu->add_icon_item(get_icon("Load", "EditorIcons"), TTR("Quick Load"), OBJ_MENU_QUICKLOAD);
+
+	// Add an option to load a resource from a file using the regular file dialog.
 	edit_menu->add_icon_item(get_icon("Load", "EditorIcons"), TTR("Load"), OBJ_MENU_LOAD);
 
 	// Add options for changing existing value of the resource.
@@ -247,6 +254,17 @@ void EditorResourcePicker::_edit_menu_cbk(int p_which) {
 			file_dialog->popup_centered_ratio();
 		} break;
 
+		case OBJ_MENU_QUICKLOAD: {
+			if (!quick_open) {
+				quick_open = memnew(EditorQuickOpen);
+				add_child(quick_open);
+				quick_open->connect("quick_open", this, "_file_quick_selected");
+			}
+
+			quick_open->popup_dialog(base_type);
+			quick_open->set_title(TTR("Resource"));
+		} break;
+
 		case OBJ_MENU_EDIT: {
 			if (edited_resource.is_valid()) {
 				emit_signal("resource_selected", edited_resource);
@@ -644,6 +662,7 @@ void EditorResourcePicker::drop_data_fw(const Point2 &p_point, const Variant &p_
 void EditorResourcePicker::_bind_methods() {
 	// Internal binds.
 	ClassDB::bind_method(D_METHOD("_file_selected"), &EditorResourcePicker::_file_selected);
+	ClassDB::bind_method(D_METHOD("_file_quick_selected"), &EditorResourcePicker::_file_quick_selected);
 	ClassDB::bind_method(D_METHOD("_resource_selected"), &EditorResourcePicker::_resource_selected);
 	ClassDB::bind_method(D_METHOD("_button_draw"), &EditorResourcePicker::_button_draw);
 	ClassDB::bind_method(D_METHOD("_button_input"), &EditorResourcePicker::_button_input);

editor/editor_resource_picker.h

@@ -32,6 +32,7 @@
 #define EDITOR_RESOURCE_PICKER_H
 
 #include "editor_file_dialog.h"
+#include "quick_open.h"
 #include "scene/gui/box_container.h"
 #include "scene/gui/button.h"
 #include "scene/gui/popup_menu.h"
@@ -54,9 +55,11 @@ class EditorResourcePicker : public HBoxContainer {
 	TextureRect *preview_rect;
 	Button *edit_button;
 	EditorFileDialog *file_dialog = nullptr;
+	EditorQuickOpen *quick_open = nullptr;
 
 	enum MenuOption {
 		OBJ_MENU_LOAD,
+		OBJ_MENU_QUICKLOAD,
 		OBJ_MENU_EDIT,
 		OBJ_MENU_CLEAR,
 		OBJ_MENU_MAKE_UNIQUE,
@@ -75,6 +78,7 @@ class EditorResourcePicker : public HBoxContainer {
 	void _update_resource_preview(const String &p_path, const Ref<Texture> &p_preview, const Ref<Texture> &p_small_preview, ObjectID p_obj);
 
 	void _resource_selected();
+	void _file_quick_selected();
 	void _file_selected(const String &p_path);
 
 	void _update_menu();