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// vim: set tabstop=4 shiftwidth=4 noexpandtab:
/*
Gwenview - A simple image viewer for KDE
Copyright 2000-2004 Aurélien Gâteau
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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#ifndef DRAGPIXMAPGENERATOR_H
#define DRAGPIXMAPGENERATOR_H
// Qt
#include <qapplication.h>
#include <qpixmap.h>
#include <qtooltip.h>
#include <qvaluelist.h>
#include <qvaluevector.h>
// KDE
#include <klocale.h>
namespace Gwenview {
template <class T>
class DragPixmapGenerator;
template <class T>
class DragPixmapItemDrawer {
public:
DragPixmapItemDrawer()
: mGenerator(0) {}
virtual ~DragPixmapItemDrawer() {}
virtual void setGenerator(DragPixmapGenerator<T>* generator) {
mGenerator = generator;
}
virtual QSize itemSize(T)=0;
virtual void drawItem(QPainter*, int left, int top, T)=0;
virtual int spacing() const {
return 0;
}
protected:
DragPixmapGenerator<T>* mGenerator;
};
QPixmap dragPixmapGeneratorHelper(QValueVector<QPixmap> pixmapVector);
template <class T>
class DragPixmapGenerator {
public:
/** Offset between cursor and dragged images */
static const uint DRAG_OFFSET=16;
/** Maximum width of an item painted by DragPixmapItemDrawer */
static const int ITEM_MAX_WIDTH=128;
static const int MAX_HEIGHT=200;
static const int DRAG_MARGIN=4;
DragPixmapGenerator()
: mPixmapWidth(0) {}
void addItem(const T& item) {
mItemList << item;
}
int maxWidth() const {
return ITEM_MAX_WIDTH;
}
/**
* Returns the width of the generated pixmap, not including the margin.
* To be used by DragPixmapItemDrawer<T>::drawItem. Should not be used
* anywhere else since this value is initialized in generate().
*/
int pixmapWidth() const {
return mPixmapWidth;
}
void setItemDrawer(DragPixmapItemDrawer<T>* drawer) {
mItemDrawer = drawer;
drawer->setGenerator(this);
}
QPixmap generate() {
int width = 0, height = 0;
int dragCount = 0;
int spacing = mItemDrawer->spacing();
bool listCropped;
QString bottomText;
QFontMetrics fm = QApplication::fontMetrics();
// Compute pixmap size and update dragCount
QValueListIterator<T> it = mItemList.begin();
QValueListIterator<T> end = mItemList.end();
height = -spacing;
for (; it!= end && height < MAX_HEIGHT; ++dragCount, ++it) {
QSize itemSize = mItemDrawer->itemSize(*it);
Q_ASSERT(itemSize.width() <= ITEM_MAX_WIDTH);
width = QMAX(width, itemSize.width());
height += itemSize.height() + spacing;
}
listCropped = it != end;
if (listCropped) {
// If list has been cropped, leave space for item count text
height += fm.height();
bottomText = i18n("%1 items").arg(mItemList.count());
width = QMAX(width, fm.width("... " + bottomText));
}
mPixmapWidth = width;
// Init pixmap
QPixmap pixmap(width + 2*DRAG_MARGIN, height + 2*DRAG_MARGIN);
QColorGroup cg = QToolTip::palette().active();
pixmap.fill(cg.base());
QPainter painter(&pixmap);
// Draw border
painter.setPen(cg.dark());
painter.drawRect(pixmap.rect());
// Draw items
it = mItemList.begin();
height = DRAG_MARGIN;
for (int pos=0; pos < dragCount; ++pos, ++it) {
mItemDrawer->drawItem(&painter, DRAG_MARGIN, height, *it);
height += mItemDrawer->itemSize(*it).height() + spacing;
}
// Draw text if necessary
if (listCropped) {
int posY= height + fm.ascent();
painter.drawText(DRAG_MARGIN, posY, "...");
int offset = width - fm.width(bottomText);
painter.drawText(DRAG_MARGIN + offset, posY, bottomText);
}
painter.end();
return pixmap;
}
private:
QValueList<T> mItemList;
DragPixmapItemDrawer<T>* mItemDrawer;
int mPixmapWidth;
};
} // namespace
#endif /* DRAGPIXMAPGENERATOR_H */
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