/* ScummVM - Graphic Adventure Engine
 *
 * ScummVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

#ifndef GUI_WIDGETS_EDITABLE_H
#define GUI_WIDGETS_EDITABLE_H

#include "common/keyboard.h"
#include "common/str.h"
#include "gui/widget.h"
#include "gui/ThemeEngine.h"
#include "gui/object.h"

namespace Common {
struct Rect;
}

namespace GUI {

/**
 * Base class for widgets which need to edit text, like ListWidget and
 * EditTextWidget.
 */
class EditableWidget : public Widget, public CommandSender {
protected:
	Common::U32String _editString;

	uint32		_cmd;

	bool		_caretVisible;
	uint32		_caretTime;
	int			_caretPos;

	bool		_caretInverse;

	int			_editScrollOffset;

	int			_selCaretPos;
	int			_selOffset;
	bool		_shiftPressed;
	bool		_isDragging;
	bool		_disableSelection;

	Graphics::TextAlign _align;
	Graphics::TextAlign _drawAlign;

	ThemeEngine::FontStyle  _font;

	ThemeEngine::TextInversionState  _inversion;

public:
	EditableWidget(GuiObject *boss, int x, int y, int w, int h, bool scale, const Common::U32String &tooltip = Common::U32String(), uint32 cmd = 0);
	EditableWidget(GuiObject *boss, int x, int y, int w, int h, const Common::U32String &tooltip = Common::U32String(), uint32 cmd = 0);
	EditableWidget(GuiObject *boss, const Common::String &name, const Common::U32String &tooltip = Common::U32String(), uint32 cmd = 0);
	~EditableWidget() override;

	void init();

	virtual void setEditString(const Common::U32String &str);
	virtual const Common::U32String &getEditString() const	{ return _editString; }

	void handleTickle() override;
	void handleMouseDown(int x, int y, int button, int clickCount) override;
	void handleMouseUp(int x, int y, int button, int clickCount) override;
	void handleMouseMoved(int x, int y, int button) override;
	bool handleKeyDown(Common::KeyState state) override;
	bool handleKeyUp(Common::KeyState state) override;
	void reflowLayout() override;

	bool setCaretPos(int newPos);
	void setSelectionOffset(int newOffset);

protected:
	virtual void startEditMode() = 0;
	virtual void endEditMode() = 0;
	virtual void abortEditMode() = 0;
	/**
	 * The area where text input is being made. This should exactly match the
	 * rect with which the actual edit string is drawn otherwise nasty
	 * graphics glitches when redrawing the caret can occur.
	 */
	virtual Common::Rect getEditRect() const = 0;
	virtual int getCaretOffset() const;
	virtual int getSelectionCarretOffset() const;
	void drawCaret(bool erase);
	bool adjustOffset();
	void makeCaretVisible();

	void defaultKeyDownHandler(Common::KeyState &state, bool &dirty, bool &forcecaret, bool &handled);

	void setFontStyle(ThemeEngine::FontStyle font) { _font = font; }

	virtual bool isCharAllowed(Common::u32char_type_t c) const;
	bool tryInsertChar(Common::u32char_type_t c, int pos);

	int caretVisualPos(int logicalPos);
	int caretLogicalPos() const;

	void clearSelection();
};

} // End of namespace GUI

#endif