plasma-framework/private/windowpreview.cpp

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/*
* Copyright 2007 by Dan Meltzer <hydrogen@notyetimplemented.com>
* Copyright (C) 2008 by Alexis Ménard <darktears31@gmail.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Library General Public License as
* published by the Free Software Foundation; either version 2, 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 Library 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.
*/
#include "windowpreview_p.h"
#include <QPainter>
#include <QVarLengthArray>
#include <kwindowsystem.h>
#include <kdebug.h>
#include <plasma/framesvg.h>
#ifdef Q_WS_X11
#include <QX11Info>
#include <X11/Xlib.h>
#include <fixx11h.h>
#endif
namespace Plasma {
bool WindowPreview::previewsAvailable() // static
{
if (!KWindowSystem::compositingActive()) {
return false;
}
#ifdef Q_WS_X11
// hackish way to find out if KWin has the effect enabled,
// TODO provide proper support
Display *dpy = QX11Info::display();
Atom atom = XInternAtom(dpy, "_KDE_WINDOW_PREVIEW", False);
int cnt;
Atom *list = XListProperties(dpy, DefaultRootWindow(dpy), &cnt);
if (list != NULL) {
bool ret = (qFind(list, list + cnt, atom) != list + cnt);
XFree(list);
return ret;
}
#endif
return false;
}
WindowPreview::WindowPreview(QWidget *parent)
: QWidget(parent)
{
m_background = new Plasma::FrameSvg(this);
m_background->setImagePath("widgets/frame");
m_background->setElementPrefix("raised");
}
void WindowPreview::setWindowIds(const QList<WId> wids)
{
if (!previewsAvailable()) {
setMinimumSize(0,0);
setMaximumSize(QWIDGETSIZE_MAX, QWIDGETSIZE_MAX);
ids.clear();
return;
}
ids = wids;
readWindowSizes();
QSize s(sizeHint());
if (s.isValid()) {
setFixedSize(sizeHint());
}
}
QList<WId> WindowPreview::windowIds() const
{
return ids;
}
QSize WindowPreview::sizeHint() const
{
if (ids.size() == 0) {
return QSize();
}
if (!windowSizes.size() == 0) {
readWindowSizes();
}
int maxHeight = 0;
int totalWidth = 0;
foreach (QSize s, windowSizes) {
if (s.height() > maxHeight) {
maxHeight = s.height();
}
totalWidth += s.width();
}
QSize s(totalWidth, maxHeight);
qreal left, top, right, bottom;
m_background->getMargins(left, top, right, bottom);
s.scale(WINDOW_WIDTH*windowSizes.size(), WINDOW_HEIGHT, Qt::KeepAspectRatio);
s = s + QSize(left+right+WINDOW_MARGIN*(windowSizes.size()-1), top+bottom);
return s;
}
void WindowPreview::readWindowSizes() const
{
windowSizes.clear();
foreach (WId id, ids) {
#ifdef Q_WS_X11
if (id > 0) {
KWindowInfo info = KWindowSystem::windowInfo(id, NET::WMGeometry|NET::WMFrameExtents);
windowSizes.append(info.frameGeometry().size());
} else {
windowSizes.append(QSize());
}
#else
windowSizes.append(QSize());
#endif
}
}
bool WindowPreview::isEmpty() const
{
foreach (WId id, ids) {
if (id != 0) {
return false;
}
}
return true;
}
void WindowPreview::setInfo()
{
#ifdef Q_WS_X11
Display *dpy = QX11Info::display();
Atom atom = XInternAtom(dpy, "_KDE_WINDOW_PREVIEW", False);
if (isEmpty()) {
XDeleteProperty(dpy, parentWidget()->winId(), atom);
return;
}
if (windowSizes.size() == 0) {
readWindowSizes();
}
if (windowSizes.size() == 0) {
XDeleteProperty(dpy, parentWidget()->winId(), atom);
return;
}
Q_ASSERT(parentWidget()->isWindow()); // parent must be toplevel
QSize thumbnailSize = sizeHint();
thumbnailSize.scale(size(), Qt::KeepAspectRatio);
m_background->resizeFrame(thumbnailSize);
qreal left, top, right, bottom;
m_background->getMargins(left, top, right, bottom);
QRect thumbnailRect = geometry().adjusted(left, top, -right, -bottom);
const int numWindows = ids.size();
m_thumbnailRects.clear();
int x = thumbnailRect.x();
foreach (QSize s, windowSizes) {
s.scale((qreal)(thumbnailRect.width()-WINDOW_MARGIN*(numWindows-1))/numWindows, thumbnailRect.height(), Qt::KeepAspectRatio);
int y = thumbnailRect.y() + (thumbnailRect.height() - s.height())/2;
m_thumbnailRects.append(QRect(QPoint(x,y), s));
x += s.width() + WINDOW_MARGIN;
}
QVarLengthArray<long, 1024> data(1 + (6 * numWindows));
data[0] = numWindows;
for (int i = 0; i < numWindows; ++i) {
const int start = (i * 6) + 1;
const QRect thumbnailRect = m_thumbnailRects[i];
data[start] = 5;
data[start+1] = ids[i];
data[start+2] = thumbnailRect.x();
data[start+3] = thumbnailRect.y();
data[start+4] = thumbnailRect.width();
data[start+5] = thumbnailRect.height();
}
XChangeProperty(dpy, parentWidget()->winId(), atom, atom, 32, PropModeReplace,
reinterpret_cast<unsigned char *>(data.data()), data.size());
#endif
}
void WindowPreview::paintEvent(QPaintEvent *e)
{
Q_UNUSED(e)
#ifdef Q_WS_X11
QPainter painter(this);
qreal left, top, right, bottom;
m_background->getMargins(left, top, right, bottom);
foreach (QRect r, m_thumbnailRects) {
kWarning()<<r;
m_background->resizeFrame(r.size()+QSize(left+right, top+bottom));
m_background->paintFrame(&painter, r.topLeft()-pos()-QPoint(left,top));
}
#endif
}
} // namespace Plasma
#include "windowpreview_p.moc"