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// -*- c-basic-offset: 4 -*-
/*
Rosegarden
A sequencer and musical notation editor.
This program is Copyright 2000-2008
Guillaume Laurent <[email protected]>,
Chris Cannam <[email protected]>,
Richard Bown <[email protected]>
The moral right of the authors to claim authorship of this work
has been asserted.
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. See the file
COPYING included with this distribution for more information.
*/
#ifndef TQCANVASGROUPABLEITEM_H
#define TQCANVASGROUPABLEITEM_H
#include <tqcanvas.h>
class TQCanvasItemGroup;
/**
* This class is meant to be inherited by TQCanvasItem children to make
* them groupable.
*
* On destruction, the item will remove itself from the group it's
* attached to.
*
* @see QCanvasSpriteGroupable
* @see TQCanvasLineGroupable
*/
class QCanvasGroupableItem
{
friend class TQCanvasItemGroup;
public:
/**
* Create a groupable item, e.g. put the item in the specified
* TQCanvasItemGroup. If withRelativeCoords is true, the item's
* position will be translated so that it's coordinates are
* relative to those of the item group.
*
* @see TQCanvasItemGroup#addItemWithRelativeCoords()
*/
QCanvasGroupableItem(TQCanvasItem*, TQCanvasItemGroup*,
bool withRelativeCoords = false);
virtual ~QCanvasGroupableItem();
/// Returns the TQCanvasItemGroup this groupable item belongs to
TQCanvasItemGroup* group() { return m_group; }
/// Returns the TQCanvasItemGroup this groupable item belongs to
const TQCanvasItemGroup* group() const { return m_group; }
/// Returns the TQCanvasItem which this groupable item wraps
TQCanvasItem *item() { return m_item; }
/**
* Same as moveBy(), except that the move is done relative to the
* item group's coordinates
*/
virtual void relativeMoveBy(double dx, double dy);
protected:
/**
* Detach item from the item group - called by TQCanvasItemGroup only
*
* Set m_group to 0, so that on destruction the item won't try to
* remove itself from the group
*/
void detach();
private:
//--------------- Data members ---------------------------------
TQCanvasItemGroup* m_group;
TQCanvasItem* m_item;
};
/**
* This class implements TQCanvasItem groups
*
* An item group will keep its items in a fixed relative position when
* moved, just like in a drawing program where you can "bind" several
* items together so that they'll behave as a single item.
*
* Proper behavior requires collaboration from the TQCanvasView,
* though. When about to move an item, the TQCanvasView object should
* first check if it's not a groupable item, and if so fetch its
* TQCanvasItemGroup and move it instead.
*/
class TQCanvasItemGroup : public TQCanvasItem
{
public:
TQCanvasItemGroup(TQCanvas *);
virtual ~TQCanvasItemGroup();
virtual void moveBy(double dx, double dy);
virtual void advance(int stage);
virtual bool collidesWith(const TQCanvasItem*) const;
virtual void draw(TQPainter&);
virtual void setVisible(bool yes);
virtual void setSelected(bool yes);
virtual void setEnabled(bool yes);
virtual void setActive(bool yes);
virtual int rtti() const;
virtual TQRect boundingRect() const;
virtual TQRect boundingRectAdvanced() const;
/**
* Add a new item to this group.
*
* The item's coordinates are kept as is.
*
* @see addItemWithRelativeCoords()
*/
virtual void addItem(TQCanvasItem *);
/**
* Add a new item to this group.
*
* The item's coordinates are considered relative to the group.
* For example, suppose you have a TQCanvasItemGroup whose coords
* are 10,10. If you call addItemWithRelativeCoords() with an item
* whose coords are 5,5, the item is moved so that its coords
* will be 5,5 relative to the group (e.g. 15,15).
*
* @see addItem()
*/
virtual void addItemWithRelativeCoords(TQCanvasItem *);
/**
* Remove the specified item from the group
*/
virtual void removeItem(TQCanvasItem*);
private:
virtual bool collidesWith(const TQCanvasSprite*,
const TQCanvasPolygonalItem*,
const TQCanvasRectangle*,
const TQCanvasEllipse*,
const TQCanvasText* ) const;
protected:
//--------------- Data members ---------------------------------
TQCanvasItemList m_items;
};
/**
* A TQCanvasLine which can be put in a QCanvasGroup
*/
class TQCanvasLineGroupable : public TQCanvasLine, public QCanvasGroupableItem
{
public:
TQCanvasLineGroupable(TQCanvas *c, TQCanvasItemGroup *g);
};
/**
* A TQCanvasRectangle which can be put in a QCanvasGroup
*/
class TQCanvasRectangleGroupable : public TQCanvasRectangle, public QCanvasGroupableItem
{
public:
TQCanvasRectangleGroupable(TQCanvas *c, TQCanvasItemGroup *g);
};
/**
* A TQCanvasText which can be put in a QCanvasGroup
*/
class TQCanvasTextGroupable : public TQCanvasText, public QCanvasGroupableItem
{
public:
TQCanvasTextGroupable(TQCanvas *c, TQCanvasItemGroup *g);
TQCanvasTextGroupable(const TQString&, TQCanvas *c, TQCanvasItemGroup *g);
};
/**
* A QCanvasSprite that can be put in a QCanvasGroup
*/
class TQCanvasSpriteGroupable : public TQCanvasSprite, public QCanvasGroupableItem
{
public:
TQCanvasSpriteGroupable(TQCanvasPixmapArray*,
TQCanvas*,
TQCanvasItemGroup*);
};
#endif
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