kwin/kcmkwin/kwindecoration/buttons.h

/*
	This is the new kwindecoration kcontrol module

	Copyright (c) 2004, Sandro Giessl
	Copyright (c) 2001
		Karol Szwed <gallium@kde.org>
		http://gallium.n3.net/

	Supports new kwin configuration plugins, and titlebar button position
	modification via dnd interface.

	Based on original "kwintheme" (Window Borders) 
	Copyright (C) 2001 Rik Hemsley (rikkus) <rik@kde.org>

    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 2 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, write to the Free Software
    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

*/

#ifndef __BUTTONS_H_
#define __BUTTONS_H_

#include <qevent.h>
#include <qdragobject.h>
#include <qlistbox.h>

#include <klistview.h>

/**
 * This class holds the button data.
 */
class Button
{
	public:
		Button();
		Button(const QString& name, const QPixmap& icon, QChar type, bool duplicate, bool supported);
		virtual ~Button();

		QString name;
		QPixmap icon;
		QChar type;
		bool duplicate;
		bool supported;
};

class ButtonDrag : public QStoredDrag
{
	public:
		ButtonDrag( Button btn, QWidget* parent, const char* name=0 );
		~ButtonDrag() {};

		static bool canDecode( QDropEvent* e );
		static bool decode( QDropEvent* e, Button& btn );
};

/**
 * This is plugged into ButtonDropSite
 */
class ButtonDropSiteItem
{
	public:
		ButtonDropSiteItem(const Button& btn);
		~ButtonDropSiteItem();
	
		Button button();

		QRect rect;
		int width();
		int height();

		void draw(QPainter *p, QRect rect);

	private:
		Button m_button;
};

/**
 * This is plugged into ButtonSource
 */
class ButtonSourceItem : public QListViewItem
{
	public:
		ButtonSourceItem(QListView * parent, const Button& btn);
		virtual ~ButtonSourceItem();

		void paintCell(QPainter *p, const QColorGroup &cg, int column, int width, int align);

		void setButton(const Button& btn);
		Button button() const;
	private:
		Button m_button;
};

/**
 * Implements the button drag source list view
 */
class ButtonSource : public KListView
{
	Q_OBJECT

	public:
		ButtonSource(QWidget *parent = 0, const char* name = 0);
		virtual ~ButtonSource();

		QSize sizeHint() const;

		void hideAllButtons();
		void showAllButtons();

	public slots:
		void hideButton(QChar btn);
		void showButton(QChar btn);

	protected:
		bool acceptDrag(QDropEvent* e) const;
		virtual QDragObject *dragObject();
};

typedef QValueList<ButtonDropSiteItem*> ButtonList;

/**
 * This class renders and handles the demo titlebar dropsite
 */
class ButtonDropSite: public QFrame
{
	Q_OBJECT

	public:
		ButtonDropSite( QWidget* parent=0, const char* name=0 );
		~ButtonDropSite();

		// Allow external classes access our buttons - ensure buttons are
		// not duplicated however.
		ButtonList buttonsLeft;
		ButtonList buttonsRight;
		void clearLeft();
		void clearRight();

	signals:
		void buttonAdded(QChar btn);
		void buttonRemoved(QChar btn);
		void changed();

	public slots:
		bool removeSelectedButton(); ///< This slot is called after we drop on the item listbox...
		void recalcItemGeometry(); ///< Call this whenever the item list changes... updates the items' rect property

	protected:
		void resizeEvent(QResizeEvent*);
		void dragEnterEvent( QDragEnterEvent* e );
		void dragMoveEvent( QDragMoveEvent* e );
		void dragLeaveEvent( QDragLeaveEvent* e );
		void dropEvent( QDropEvent* e );
		void mousePressEvent( QMouseEvent* e ); ///< Starts dragging a button...

		void drawContents( QPainter* p );
		ButtonDropSiteItem *buttonAt(QPoint p);
		bool removeButton(ButtonDropSiteItem *item);
		int calcButtonListWidth(const ButtonList& buttons); ///< Computes the total space the buttons will take in the titlebar
		void drawButtonList(QPainter *p, const ButtonList& buttons, int offset);

		QRect leftDropArea();
		QRect rightDropArea();

	private:
		/**
		 * Try to find the item. If found, set its list and iterator and return true, else return false
		 */
		bool getItemIterator(ButtonDropSiteItem *item, ButtonList* &list, ButtonList::iterator &iterator);

		void cleanDropVisualizer();
		QRect m_oldDropVisualizer;

		ButtonDropSiteItem *m_selected;
};

class ButtonPositionWidget : public QWidget
{
	Q_OBJECT

	public:
		ButtonPositionWidget(QWidget *parent = 0, const char* name = 0);
		~ButtonPositionWidget();

		QString buttonsLeft() const;
		QString buttonsRight() const;
		void setButtonsLeft(const QString &buttons);
		void setButtonsRight(const QString &buttons);

	signals:
		void changed();

	private:
		void clearButtonList(const ButtonList& btns);
		Button getButton(QChar type, bool& success);

		ButtonDropSite* m_dropSite;
		ButtonSource *m_buttonSource;
};


#endif
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