kwin/effects/taskbarthumbnail/taskbarthumbnail.cpp

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/********************************************************************
KWin - the KDE window manager
This file is part of the KDE project.
Copyright (C) 2007 Rivo Laks <rivolaks@hot.ee>
Copyright (C) 2007 Lubos Lunak <l.lunak@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, see <http://www.gnu.org/licenses/>.
*********************************************************************/
#include "taskbarthumbnail.h"
#include <kdebug.h>
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#include <kwinglutils.h>
// This effect shows a preview inside a window that has a special property set
// on it that says which window and where to render. It is used by the taskbar
// to show window previews in tooltips.
namespace KWin
{
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KWIN_EFFECT(taskbarthumbnail, TaskbarThumbnailEffect)
TaskbarThumbnailEffect::TaskbarThumbnailEffect()
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{
atom = effects->announceSupportProperty("_KDE_WINDOW_PREVIEW", this);
connect(effects, SIGNAL(windowAdded(KWin::EffectWindow*)), this, SLOT(slotWindowAdded(KWin::EffectWindow*)));
connect(effects, SIGNAL(windowDeleted(KWin::EffectWindow*)), this, SLOT(slotWindowDeleted(KWin::EffectWindow*)));
connect(effects, SIGNAL(windowDamaged(KWin::EffectWindow*,QRect)), this, SLOT(slotWindowDamaged(KWin::EffectWindow*,QRect)));
connect(effects, SIGNAL(propertyNotify(KWin::EffectWindow*,long)), this, SLOT(slotPropertyNotify(KWin::EffectWindow*,long)));
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}
TaskbarThumbnailEffect::~TaskbarThumbnailEffect()
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{
}
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void TaskbarThumbnailEffect::prePaintScreen(ScreenPrePaintData& data, int time)
{
effects->prePaintScreen(data, time);
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}
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void TaskbarThumbnailEffect::prePaintWindow(EffectWindow* w, WindowPrePaintData& data, int time)
{
// TODO what if of the windows is translucent and one not? change data.mask?
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effects->prePaintWindow(w, data, time);
}
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void TaskbarThumbnailEffect::paintWindow(EffectWindow* w, int mask, QRegion region, WindowPaintData& data)
{
effects->paintWindow(w, mask, region, data); // paint window first
if (thumbnails.contains(w)) {
// paint thumbnails on it
int mask = PAINT_WINDOW_TRANSFORMED;
if (data.opacity() == 1.0)
mask |= PAINT_WINDOW_OPAQUE;
else
mask |= PAINT_WINDOW_TRANSLUCENT;
mask |= PAINT_WINDOW_LANCZOS;
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foreach (const Data & thumb, thumbnails.values(w)) {
EffectWindow* thumbw = effects->findWindow(thumb.window);
if (thumbw == NULL)
continue;
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WindowPaintData thumbData(thumbw);
thumbData.multiplyOpacity(data.opacity());
QRect r, thumbRect(thumb.rect);
thumbRect.translate(w->pos() + QPoint(data.xTranslation(), data.yTranslation()));
thumbRect.setSize(QSize(thumbRect.width() * data.xScale(), thumbRect.height() * data.yScale())); // QSize has no vector multiplicator... :-(
if (effects->isOpenGLCompositing()) {
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if (data.shader) {
thumbData.shader = data.shader;
}
} // if ( effects->compositingType() == KWin::OpenGLCompositing )
setPositionTransformations(thumbData, r, thumbw, thumbRect, Qt::KeepAspectRatio);
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effects->drawWindow(thumbw, mask, r, thumbData);
}
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}
} // End of function
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void TaskbarThumbnailEffect::slotWindowDamaged(EffectWindow* w, const QRect& damage)
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{
Q_UNUSED(damage);
// Update the thumbnail if the window was damaged
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foreach (EffectWindow * window, thumbnails.uniqueKeys())
foreach (const Data & thumb, thumbnails.values(window))
if (w == effects->findWindow(thumb.window))
window->addRepaint(thumb.rect);
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}
void TaskbarThumbnailEffect::slotWindowAdded(EffectWindow* w)
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{
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slotPropertyNotify(w, atom); // read initial value
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}
void TaskbarThumbnailEffect::slotWindowDeleted(EffectWindow* w)
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{
foreach (EffectWindow *window, thumbnails.uniqueKeys()) {
foreach (const Data &thumb, thumbnails.values(window)) {
if (w == effects->findWindow(thumb.window)) {
window->addRepaint(thumb.rect);
}
}
}
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thumbnails.remove(w);
}
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void TaskbarThumbnailEffect::slotPropertyNotify(EffectWindow* w, long a)
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{
if (!w || a != atom)
return;
w->addRepaintFull();
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thumbnails.remove(w);
QByteArray data = w->readProperty(atom, atom, 32);
if (data.length() < 1)
return;
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long* d = reinterpret_cast< long* >(data.data());
int len = data.length() / sizeof(d[ 0 ]);
int pos = 0;
int cnt = d[ 0 ];
++pos;
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for (int i = 0;
i < cnt;
++i) {
int size = d[ pos ];
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if (len - pos < size)
return; // format error
++pos;
Data data;
data.window = d[ pos ];
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data.rect = QRect(d[ pos + 1 ], d[ pos + 2 ], d[ pos + 3 ], d[ pos + 4 ]);
thumbnails.insert(w, data);
w->addRepaint(data.rect);
pos += size;
}
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}
bool TaskbarThumbnailEffect::isActive() const
{
return !thumbnails.isEmpty();
}
} // namespace