Move Polygon2D editor to bottom panel

Move UV editor to bottom panel to allow realtime preview of results. Rename the editor to Polygon editor.

Refactor enums and rename polygon editor members.
Remove "uv" prefixes and clarify some names. Reorder/regroup some members in header file.

editor/plugins/polygon_2d_editor_plugin.h

@@ -51,50 +51,62 @@ class VScrollBar;
 class Polygon2DEditor : public AbstractPolygon2DEditor {
 	GDCLASS(Polygon2DEditor, AbstractPolygon2DEditor);
 
-	enum Mode {
-		MODE_EDIT_UV = MODE_CONT,
-		UVEDIT_POLYGON_TO_UV,
-		UVEDIT_UV_TO_POLYGON,
-		UVEDIT_UV_CLEAR,
-		UVEDIT_GRID_SETTINGS
+	enum {
+		MENU_POLYGON_TO_UV,
+		MENU_UV_TO_POLYGON,
+		MENU_UV_CLEAR,
+		MENU_GRID_SETTINGS,
 	};
 
-	enum UVMode {
-		UV_MODE_CREATE,
-		UV_MODE_CREATE_INTERNAL,
-		UV_MODE_REMOVE_INTERNAL,
-		UV_MODE_EDIT_POINT,
-		UV_MODE_MOVE,
-		UV_MODE_ROTATE,
-		UV_MODE_SCALE,
-		UV_MODE_ADD_POLYGON,
-		UV_MODE_REMOVE_POLYGON,
-		UV_MODE_PAINT_WEIGHT,
-		UV_MODE_CLEAR_WEIGHT,
-		UV_MODE_MAX
+	enum Mode {
+		MODE_POINTS,
+		MODE_POLYGONS,
+		MODE_UV,
+		MODE_BONES,
+		MODE_MAX
 	};
 
-	Button *uv_edit_mode[4];
-	Ref<ButtonGroup> uv_edit_group;
+	enum Action {
+		ACTION_CREATE,
+		ACTION_CREATE_INTERNAL,
+		ACTION_REMOVE_INTERNAL,
+		ACTION_EDIT_POINT,
+		ACTION_MOVE,
+		ACTION_ROTATE,
+		ACTION_SCALE,
+		ACTION_ADD_POLYGON,
+		ACTION_REMOVE_POLYGON,
+		ACTION_PAINT_WEIGHT,
+		ACTION_CLEAR_WEIGHT,
+		ACTION_MAX
+	};
 
 	Polygon2D *node = nullptr;
-
-	UVMode uv_mode;
-	AcceptDialog *uv_edit = nullptr;
-	Button *uv_button[UV_MODE_MAX];
+	Polygon2D *previous_node = nullptr;
+
+	Button *dock_button = nullptr;
+	VBoxContainer *polygon_edit = nullptr;
+	Mode current_mode = MODE_MAX; // Uninitialized.
+	Button *mode_buttons[MODE_MAX];
+	Action selected_action = ACTION_CREATE;
+	Button *action_buttons[ACTION_MAX];
 	Button *b_snap_enable = nullptr;
 	Button *b_snap_grid = nullptr;
-	Panel *uv_edit_background = nullptr;
+	MenuButton *edit_menu = nullptr;
+
+	Control *canvas = nullptr;
+	Panel *canvas_background = nullptr;
 	Polygon2D *preview_polygon = nullptr;
-	Control *uv_edit_draw = nullptr;
 	EditorZoomWidget *zoom_widget = nullptr;
-	HScrollBar *uv_hscroll = nullptr;
-	VScrollBar *uv_vscroll = nullptr;
-	MenuButton *uv_menu = nullptr;
+	HScrollBar *hscroll = nullptr;
+	VScrollBar *vscroll = nullptr;
+	bool center_view_on_draw = false;
 
-	Ref<ViewPanner> uv_panner;
-	void _uv_pan_callback(Vector2 p_scroll_vec, Ref<InputEvent> p_event);
-	void _uv_zoom_callback(float p_zoom_factor, Vector2 p_origin, Ref<InputEvent> p_event);
+	Ref<ViewPanner> panner;
+	void _pan_callback(Vector2 p_scroll_vec, Ref<InputEvent> p_event);
+	void _zoom_callback(float p_zoom_factor, Vector2 p_origin, Ref<InputEvent> p_event);
+	Vector2 draw_offset;
+	real_t draw_zoom = 1.0;
 
 	VBoxContainer *bone_scroll_main_vb = nullptr;
 	ScrollContainer *bone_scroll = nullptr;
@@ -103,7 +115,7 @@ class Polygon2DEditor : public AbstractPolygon2DEditor {
 	HSlider *bone_paint_strength = nullptr;
 	SpinBox *bone_paint_radius = nullptr;
 	Label *bone_paint_radius_label = nullptr;
-	bool bone_painting;
+	bool bone_painting = false;
 	int bone_painting_bone = 0;
 	Vector<float> prev_weights;
 	Vector2 bone_paint_pos;
@@ -112,34 +124,30 @@ class Polygon2DEditor : public AbstractPolygon2DEditor {
 	void _sync_bones();
 	void _update_bone_list();
 
-	Vector2 uv_draw_ofs;
-	real_t uv_draw_zoom;
-	Vector<Vector2> points_prev;
-	Vector<Vector2> uv_create_uv_prev;
-	Vector<Vector2> uv_create_poly_prev;
-	Vector<Color> uv_create_colors_prev;
-	int uv_create_prev_internal_vertices = 0;
-	Array uv_create_bones_prev;
-	Array polygons_prev;
-
-	Vector2 uv_create_to;
-	int point_drag_index;
-	bool uv_drag;
-	bool uv_create;
+	Vector<Vector2> editing_points;
+	Vector<Vector2> previous_uv;
+	Vector<Vector2> previous_polygon;
+	Vector<Color> previous_colors;
+	int previous_internal_vertices = 0;
+	Array previous_bones;
+	Array previous_polygons;
+
+	Vector2 create_to;
+	int point_drag_index = -1;
+	bool is_dragging = false;
+	bool is_creating = false;
 	Vector<int> polygon_create;
-	UVMode uv_move_current;
-	Vector2 uv_drag_from;
+	Action current_action = ACTION_CREATE;
+	Vector2 drag_from;
 
 	AcceptDialog *error = nullptr;
 
-	Button *button_uv = nullptr;
-
-	bool use_snap;
-	bool snap_show_grid;
+	bool use_snap = false;
+	bool snap_show_grid = false;
 	Vector2 snap_offset;
 	Vector2 snap_step;
 
-	virtual void _menu_option(int p_option) override;
+	void _edit_menu_option(int p_option);
 
 	void _cancel_editing();
 	void _update_polygon_editing_state();
@@ -147,9 +155,10 @@ class Polygon2DEditor : public AbstractPolygon2DEditor {
 
 	void _center_view();
 	void _update_zoom_and_pan(bool p_zoom_at_center);
-	void _uv_input(const Ref<InputEvent> &p_input);
-	void _uv_draw();
-	void _uv_mode(int p_mode);
+	void _canvas_input(const Ref<InputEvent> &p_input);
+	void _center_view_on_draw(bool p_enabled = true);
+	void _canvas_draw();
+	void _set_action(int p_mode);
 
 	void _set_use_snap(bool p_use);
 	void _set_show_grid(bool p_show);
@@ -158,9 +167,7 @@ class Polygon2DEditor : public AbstractPolygon2DEditor {
 	void _set_snap_step_x(real_t p_val);
 	void _set_snap_step_y(real_t p_val);
 
-	void _uv_edit_mode_select(int p_mode);
-	void _uv_edit_popup_show();
-	void _uv_edit_popup_hide();
+	void _select_mode(int p_mode);
 	void _bone_paint_selected(int p_index);
 
 	int _get_polygon_count() const override;