ColorPicker UX improvements

- Tabs and MenuButton for mode selection and enabling/disabling colorized sliders
- MenuButton for shape selection with new icon for each shape
- Drag and drop functionality for presets to arrange order
- A chronological list of recently selected presets which are global for the editor
- Presets are now highlighted as being active or inactive
- Thicker sliders for easy targeting
- `grabber_offset` theme constant for Slider
- Uncolorized sliders

scene/gui/color_picker.h

@@ -38,6 +38,7 @@
 #include "scene/gui/grid_container.h"
 #include "scene/gui/label.h"
 #include "scene/gui/line_edit.h"
+#include "scene/gui/menu_button.h"
 #include "scene/gui/option_button.h"
 #include "scene/gui/popup.h"
 #include "scene/gui/separator.h"
@@ -63,7 +64,7 @@ public:
 	void set_preset_color(const Color &p_color);
 	Color get_preset_color() const;
 
-	ColorPresetButton(Color p_color);
+	ColorPresetButton(Color p_color, int p_size);
 	~ColorPresetButton();
 };
 
@@ -96,8 +97,10 @@ private:
 	static Ref<Shader> circle_shader;
 	static Ref<Shader> circle_ok_color_shader;
 	static List<Color> preset_cache;
+	static List<Color> recent_preset_cache;
 
 	int current_slider_count = SLIDER_COUNT;
+	static const int MODE_BUTTON_COUNT = 3;
 
 	bool slider_theme_modified = true;
 
@@ -114,9 +117,20 @@ private:
 	Control *wheel_uv = nullptr;
 	TextureRect *sample = nullptr;
 	GridContainer *preset_container = nullptr;
-	HSeparator *preset_separator = nullptr;
+	HBoxContainer *recent_preset_hbc = nullptr;
 	Button *btn_add_preset = nullptr;
 	Button *btn_pick = nullptr;
+	Button *btn_preset = nullptr;
+	Button *btn_recent_preset = nullptr;
+	PopupMenu *shape_popup = nullptr;
+	PopupMenu *mode_popup = nullptr;
+	MenuButton *btn_shape = nullptr;
+	MenuButton *btn_mode = nullptr;
+	Button *mode_btns[MODE_BUTTON_COUNT];
+	Ref<ButtonGroup> mode_group = nullptr;
+	ColorPresetButton *selected_recent_preset = nullptr;
+	Ref<ButtonGroup> preset_group;
+	Ref<ButtonGroup> recent_preset_group;
 
 	OptionButton *mode_option_button = nullptr;
 
@@ -135,10 +149,13 @@ private:
 	bool text_is_constructor = false;
 	PickerShapeType current_shape = SHAPE_HSV_RECTANGLE;
 	ColorModeType current_mode = MODE_RGB;
+	bool colorize_sliders = true;
 
-	const int preset_column_count = 9;
+	const int PRESET_COLUMN_COUNT = 9;
 	int prev_preset_size = 0;
+	int prev_rencet_preset_size = 0;
 	List<Color> presets;
+	List<Color> recent_presets;
 
 	Color color;
 	Color old_color;
@@ -150,6 +167,8 @@ private:
 	bool spinning = false;
 	bool presets_enabled = true;
 	bool presets_visible = true;
+	bool line_edit_mouse_release = false;
+	bool text_changed = false;
 
 	float h = 0.0;
 	float s = 0.0;
@@ -175,8 +194,12 @@ private:
 
 	void _uv_input(const Ref<InputEvent> &p_event, Control *c);
 	void _w_input(const Ref<InputEvent> &p_event);
+	void _slider_or_spin_input(const Ref<InputEvent> &p_event);
+	void _line_edit_input(const Ref<InputEvent> &p_event);
 	void _preset_input(const Ref<InputEvent> &p_event, const Color &p_color);
+	void _recent_preset_pressed(const bool pressed, ColorPresetButton *p_preset);
 	void _screen_input(const Ref<InputEvent> &p_event);
+	void _text_changed(const String &p_new_text);
 	void _add_preset_pressed();
 	void _screen_pick_pressed();
 	void _focus_enter();
@@ -185,8 +208,16 @@ private:
 
 	inline int _get_preset_size();
 	void _add_preset_button(int p_size, const Color &p_color);
+	void _add_recent_preset_button(int p_size, const Color &p_color);
 
-	void _set_color_mode(ColorModeType p_mode);
+	void _show_hide_preset(const bool &p_is_btn_pressed, Button *p_btn_preset, Container *p_preset_container);
+	void _update_drop_down_arrow(const bool &p_is_btn_pressed, Button *p_btn_preset);
+
+	void _set_mode_popup_value(ColorModeType p_mode);
+
+	Variant _get_drag_data_fw(const Point2 &p_point, Control *p_from_control);
+	bool _can_drop_data_fw(const Point2 &p_point, const Variant &p_data, Control *p_from_control) const;
+	void _drop_data_fw(const Point2 &p_point, const Variant &p_data, Control *p_from_control);
 
 protected:
 	void _notification(int);
@@ -218,13 +249,23 @@ public:
 	PickerShapeType get_picker_shape() const;
 
 	void add_preset(const Color &p_color);
+	void add_recent_preset(const Color &p_color);
 	void erase_preset(const Color &p_color);
+	void erase_recent_preset(const Color &p_color);
 	PackedColorArray get_presets() const;
+	PackedColorArray get_recent_presets() const;
 	void _update_presets();
+	void _update_recent_presets();
+
+	void _select_from_preset_container(const Color &p_color);
+	bool _select_from_recent_preset_hbc(const Color &p_color);
 
 	void set_color_mode(ColorModeType p_mode);
 	ColorModeType get_color_mode() const;
 
+	void set_colorize_sliders(bool p_colorize_sliders);
+	bool is_colorizing_sliders() const;
+
 	void set_deferred_mode(bool p_enabled);
 	bool is_deferred_mode() const;