/*************************************************************************/
/*  tab_container.h                                                      */
/*************************************************************************/
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/*                           GODOT ENGINE                                */
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/* Copyright (c) 2007-2021 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2021 Godot Engine contributors (cf. AUTHORS.md).   */
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/*************************************************************************/

#ifndef TAB_CONTAINER_H
#define TAB_CONTAINER_H

#include "scene/gui/container.h"
#include "scene/gui/popup.h"
#include "scene/resources/text_line.h"

class TabContainer : public Container {
	GDCLASS(TabContainer, Container);

public:
	enum AlignmentMode {
		ALIGNMENT_LEFT,
		ALIGNMENT_CENTER,
		ALIGNMENT_RIGHT,
	};

private:
	int first_tab_cache = 0;
	int tabs_ofs_cache = 0;
	int last_tab_cache = 0;
	int current = 0;
	int previous = 0;
	bool tabs_visible = true;
	bool all_tabs_in_front = false;
	bool buttons_visible_cache = false;
	bool menu_hovered = false;
	int highlight_arrow = -1;
	AlignmentMode alignment = ALIGNMENT_CENTER;
	int _get_top_margin() const;
	mutable ObjectID popup_obj_id;
	bool drag_to_rearrange_enabled = false;
	bool use_hidden_tabs_for_min_size = false;
	int tabs_rearrange_group = -1;

	Vector<Ref<TextLine>> text_buf;
	Vector<Control *> _get_tabs() const;
	int _get_tab_width(int p_index) const;
	bool _theme_changing = false;
	void _on_theme_changed();
	void _repaint();
	void _on_mouse_exited();
	void _update_current_tab();
	void _draw_tab(Ref<StyleBox> &p_tab_style, Color &p_font_color, int p_index, float p_x);
	void _refresh_texts();

protected:
	void _child_renamed_callback();
	virtual void gui_input(const Ref<InputEvent> &p_event) override;
	void _notification(int p_what);
	virtual void add_child_notify(Node *p_child) override;
	virtual void move_child_notify(Node *p_child) override;
	virtual void remove_child_notify(Node *p_child) override;

	Variant get_drag_data(const Point2 &p_point) override;
	bool can_drop_data(const Point2 &p_point, const Variant &p_data) const override;
	void drop_data(const Point2 &p_point, const Variant &p_data) override;
	int get_tab_idx_at_point(const Point2 &p_point) const;

	static void _bind_methods();

public:
	void set_tab_alignment(AlignmentMode p_alignment);
	AlignmentMode get_tab_alignment() const;

	void set_tabs_visible(bool p_visible);
	bool are_tabs_visible() const;

	void set_all_tabs_in_front(bool p_is_front);
	bool is_all_tabs_in_front() const;

	void set_tab_title(int p_tab, const String &p_title);
	String get_tab_title(int p_tab) const;

	void set_tab_icon(int p_tab, const Ref<Texture2D> &p_icon);
	Ref<Texture2D> get_tab_icon(int p_tab) const;

	void set_tab_disabled(int p_tab, bool p_disabled);
	bool get_tab_disabled(int p_tab) const;

	void set_tab_hidden(int p_tab, bool p_hidden);
	bool get_tab_hidden(int p_tab) const;

	int get_tab_count() const;
	void set_current_tab(int p_current);
	int get_current_tab() const;
	int get_previous_tab() const;

	Control *get_tab_control(int p_idx) const;
	Control *get_current_tab_control() const;

	virtual Size2 get_minimum_size() const override;

	virtual void get_translatable_strings(List<String> *p_strings) const override;

	void set_popup(Node *p_popup);
	Popup *get_popup() const;

	void set_drag_to_rearrange_enabled(bool p_enabled);
	bool get_drag_to_rearrange_enabled() const;
	void set_tabs_rearrange_group(int p_group_id);
	int get_tabs_rearrange_group() const;
	void set_use_hidden_tabs_for_min_size(bool p_use_hidden_tabs);
	bool get_use_hidden_tabs_for_min_size() const;

	TabContainer();
};

VARIANT_ENUM_CAST(TabContainer::AlignmentMode);

#endif // TAB_CONTAINER_H