/**************************************************************************/
/*  split_container.h                                                     */
/**************************************************************************/
/*                         This file is part of:                          */
/*                             GODOT ENGINE                               */
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/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur.                  */
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/* 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,    */
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/**************************************************************************/

#ifndef SPLIT_CONTAINER_H
#define SPLIT_CONTAINER_H

#include "scene/gui/container.h"

class SplitContainerDragger : public Control {
	GDCLASS(SplitContainerDragger, Control);
	friend class SplitContainer;
	Rect2 split_bar_rect;

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

private:
	bool dragging = false;
	int drag_from = 0;
	int drag_ofs = 0;
	bool mouse_inside = false;

public:
	virtual CursorShape get_cursor_shape(const Point2 &p_pos = Point2i()) const override;
};

class SplitContainer : public Container {
	GDCLASS(SplitContainer, Container);
	friend class SplitContainerDragger;

public:
	enum DraggerVisibility {
		DRAGGER_VISIBLE,
		DRAGGER_HIDDEN,
		DRAGGER_HIDDEN_COLLAPSED
	};

private:
	int show_drag_area = false;
	int drag_area_margin_begin = 0;
	int drag_area_margin_end = 0;
	int drag_area_offset = 0;
	int split_offset = 0;
	int computed_split_offset = 0;
	bool vertical = false;
	bool collapsed = false;
	DraggerVisibility dragger_visibility = DRAGGER_VISIBLE;
	bool dragging_enabled = true;

	SplitContainerDragger *dragging_area_control = nullptr;

	struct ThemeCache {
		int separation = 0;
		int minimum_grab_thickness = 0;
		bool autohide = false;
		Ref<Texture2D> grabber_icon;
		Ref<Texture2D> grabber_icon_h;
		Ref<Texture2D> grabber_icon_v;
		float base_scale = 1.0;
		Ref<StyleBox> split_bar_background;
	} theme_cache;

	Ref<Texture2D> _get_grabber_icon() const;
	void _compute_split_offset(bool p_clamp);
	int _get_separation() const;
	void _resort();
	Control *_get_sortable_child(int p_idx, SortableVisbilityMode p_visibility_mode = SortableVisbilityMode::VISIBLE_IN_TREE) const;

protected:
	bool is_fixed = false;

	void _notification(int p_what);
	void _validate_property(PropertyInfo &p_property) const;
	static void _bind_methods();

public:
	void set_split_offset(int p_offset);
	int get_split_offset() const;
	void clamp_split_offset();

	void set_collapsed(bool p_collapsed);
	bool is_collapsed() const;

	void set_dragger_visibility(DraggerVisibility p_visibility);
	DraggerVisibility get_dragger_visibility() const;

	void set_vertical(bool p_vertical);
	bool is_vertical() const;

	void set_dragging_enabled(bool p_enabled);
	bool is_dragging_enabled() const;

	virtual Size2 get_minimum_size() const override;

	virtual Vector<int> get_allowed_size_flags_horizontal() const override;
	virtual Vector<int> get_allowed_size_flags_vertical() const override;

	void set_drag_area_margin_begin(int p_margin);
	int get_drag_area_margin_begin() const;

	void set_drag_area_margin_end(int p_margin);
	int get_drag_area_margin_end() const;

	void set_drag_area_offset(int p_offset);
	int get_drag_area_offset() const;

	void set_show_drag_area_enabled(bool p_enabled);
	bool is_show_drag_area_enabled() const;

	Control *get_drag_area_control() { return dragging_area_control; }

	SplitContainer(bool p_vertical = false);
};

VARIANT_ENUM_CAST(SplitContainer::DraggerVisibility);

class HSplitContainer : public SplitContainer {
	GDCLASS(HSplitContainer, SplitContainer);

public:
	HSplitContainer() :
			SplitContainer(false) { is_fixed = true; }
};

class VSplitContainer : public SplitContainer {
	GDCLASS(VSplitContainer, SplitContainer);

public:
	VSplitContainer() :
			SplitContainer(true) { is_fixed = true; }
};

#endif // SPLIT_CONTAINER_H