/*************************************************************************/
/*  gradient_edit.h                                                      */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
/*                      https://godotengine.org                          */
/*************************************************************************/
/* Copyright (c) 2007-2022 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2022 Godot Engine contributors (cf. AUTHORS.md).   */
/*                                                                       */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the       */
/* "Software"), to deal in the Software without restriction, including   */
/* without limitation the rights to use, copy, modify, merge, publish,   */
/* distribute, sublicense, and/or sell copies of the Software, and to    */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions:                                             */
/*                                                                       */
/* The above copyright notice and this permission notice shall be        */
/* included in all copies or substantial portions of the Software.       */
/*                                                                       */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
/*************************************************************************/

#ifndef GRADIENT_EDIT_H
#define GRADIENT_EDIT_H

#include "scene/gui/color_picker.h"
#include "scene/gui/popup.h"
#include "scene/resources/default_theme/theme_data.h"
#include "scene/resources/gradient.h"

class GradientEdit : public Control {
	GDCLASS(GradientEdit, Control);

	PopupPanel *popup;
	ColorPicker *picker;

	bool grabbing = false;
	int grabbed = -1;
	Vector<Gradient::Point> points;
	Gradient::InterpolationMode interpolation_mode = Gradient::GRADIENT_INTERPOLATE_LINEAR;

	Ref<Gradient> gradient_cache;
	Ref<GradientTexture1D> preview_texture;

	// Make sure to use the scaled value below.
	const int BASE_SPACING = 3;
	const int BASE_POINT_WIDTH = 8;

	int draw_spacing = BASE_SPACING;
	int draw_point_width = BASE_POINT_WIDTH;

	void _draw_checker(int x, int y, int w, int h);
	void _color_changed(const Color &p_color);
	int _get_point_from_pos(int x);
	void _show_color_picker();

protected:
	virtual void gui_input(const Ref<InputEvent> &p_event) override;
	void _notification(int p_what);
	static void _bind_methods();

public:
	void set_ramp(const Vector<real_t> &p_offsets, const Vector<Color> &p_colors);
	Vector<real_t> get_offsets() const;
	Vector<Color> get_colors() const;
	void set_points(Vector<Gradient::Point> &p_points);
	Vector<Gradient::Point> &get_points();
	void set_interpolation_mode(Gradient::InterpolationMode p_interp_mode);
	Gradient::InterpolationMode get_interpolation_mode();
	ColorPicker *get_picker();

	virtual Size2 get_minimum_size() const override;

	GradientEdit();
	virtual ~GradientEdit();
};

#endif // GRADIENT_EDIT_H