plasma-framework/view.cpp
Marco Martin baf9e2bffe set the screens to -1 for both containments before switching them, it
avoids a screenownerchanged infinite loop

svn path=/trunk/KDE/kdelibs/; revision=952429
2009-04-11 21:12:03 +00:00

390 lines
9.8 KiB
C++

/*
* Copyright 2007 Aaron Seigo <aseigo@kde.org>
*
* 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 "view.h"
#include <QTimer>
#include <kglobal.h>
#include <kwindowsystem.h>
#include <kactioncollection.h>
#include "corona.h"
#include "containment.h"
#include "wallpaper.h"
using namespace Plasma;
namespace Plasma
{
class ViewPrivate
{
public:
ViewPrivate(View *view, int uniqueId)
: q(view),
containment(0),
viewId(0),
lastScreen(-1),
lastDesktop(-2),
drawWallpaper(true),
trackChanges(true),
init(false)
{
if (uniqueId > s_maxViewId) {
s_maxViewId = uniqueId;
viewId = uniqueId;
}
if (viewId == 0) {
// we didn't get a sane value assigned to us, so lets
// grab the next available id
viewId = ++s_maxViewId;
}
}
~ViewPrivate()
{
}
void privateInit()
{
q->setContainment(containment);
init = true;
}
void updateSceneRect()
{
if (!containment || !trackChanges) {
return;
}
kDebug() << "!!!!!!!!!!!!!!!!! setting the scene rect to"
<< containment->sceneBoundingRect()
<< "associated screen is" << containment->screen();
emit q->sceneRectAboutToChange();
if (q->transform().isIdentity()) { //we're not zoomed out
q->setSceneRect(containment->sceneBoundingRect());
} else {
//kDebug() << "trying to show the containment nicely";
q->ensureVisible(containment->sceneBoundingRect());
//q->centerOn(containment);
}
emit q->sceneRectChanged();
}
void containmentDestroyed()
{
containment = 0;
}
void containmentScreenChanged(int wasScreen, int newScreen, Plasma::Containment *containment)
{
Q_UNUSED(wasScreen)
lastScreen = newScreen;
lastDesktop = containment->desktop();
}
void initGraphicsView()
{
q->setFrameShape(QFrame::NoFrame);
q->setAttribute(Qt::WA_TranslucentBackground);
q->setAutoFillBackground(true);
q->setDragMode(QGraphicsView::NoDrag);
//setCacheMode(QGraphicsView::CacheBackground);
q->setInteractive(true);
q->setAcceptDrops(true);
q->setAlignment(Qt::AlignLeft | Qt::AlignTop);
q->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
q->setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
}
static int s_maxViewId;
Plasma::View *q;
Plasma::Containment *containment;
int viewId;
int lastScreen;
int lastDesktop;
bool drawWallpaper : 1;
bool trackChanges : 1;
bool init : 1;
};
int ViewPrivate::s_maxViewId(0);
View::View(Containment *containment, QWidget *parent)
: QGraphicsView(parent),
d(new ViewPrivate(this, 0))
{
d->initGraphicsView();
if (containment) {
setScene(containment->scene());
d->containment = containment;
QTimer::singleShot(0, this, SLOT(privateInit()));
}
}
View::View(Containment *containment, int viewId, QWidget *parent)
: QGraphicsView(parent),
d(new ViewPrivate(this, viewId))
{
d->initGraphicsView();
if (containment) {
setScene(containment->scene());
d->containment = containment;
QTimer::singleShot(0, this, SLOT(privateInit()));
}
}
View::~View()
{
delete d;
// FIXME FIX a focus crash but i wasn't able to reproduce in a simple test case for Qt guys
// NB: this is also done in Corona
clearFocus();
}
void View::setScreen(int screen, int desktop)
{
if (screen > -1) {
Corona *corona = qobject_cast<Corona*>(scene());
if (!corona) {
return;
}
// -1 == All desktops
if (desktop < -1 || desktop > KWindowSystem::numberOfDesktops() - 1) {
desktop = -1;
}
Containment *containment = corona->containmentForScreen(screen, desktop);
if (containment) {
d->containment = 0; //so that we don't end up on the old containment's screen
d->lastScreen = screen;
d->lastDesktop = desktop;
setContainment(containment);
}
}
}
int View::screen() const
{
return d->lastScreen;
}
int View::desktop() const
{
if (d->containment) {
return d->containment->desktop();
}
return d->lastDesktop;
}
int View::effectiveDesktop() const
{
int desk = desktop();
return desk > -1 ? desk : KWindowSystem::currentDesktop();
}
void View::setContainment(Plasma::Containment *containment)
{
if (d->init && containment == d->containment) {
return;
}
if (d->containment) {
disconnect(d->containment, SIGNAL(destroyed(QObject*)), this, SLOT(containmentDestroyed()));
disconnect(d->containment, SIGNAL(geometryChanged()), this, SLOT(updateSceneRect()));
disconnect(d->containment, SIGNAL(screenChanged(int, int, Plasma::Containment *)), this, SLOT(containmentScreenChanged(int, int, Plasma::Containment *)));
d->containment->removeAssociatedWidget(this);
}
if (!containment) {
d->containment = 0;
return;
}
Containment *oldContainment = d->containment;
int screen = -1;
int desktop = -1;
if (oldContainment) {
screen = d->containment->screen();
desktop = d->containment->desktop();
} else {
setScene(containment->scene());
}
d->containment = containment;
//add keyboard-shortcut actions
d->containment->addAssociatedWidget(this);
int otherScreen = containment->screen();
int otherDesktop = containment->desktop();
if (screen > -1) {
d->lastScreen = screen;
d->lastDesktop = desktop;
oldContainment->setScreen(-1, -1);
containment->setScreen(-1, -1);
containment->setScreen(screen, desktop);
} else {
d->lastScreen = otherScreen;
d->lastDesktop = otherDesktop;
}
if (oldContainment && otherScreen > -1) {
// assign the old containment the old screen/desktop
oldContainment->setScreen(otherScreen, otherDesktop);
}
/*
if (oldContainment) {
kDebug() << "old" << (QObject*)oldContainment << screen << oldContainment->screen()
<< "new" << (QObject*)containment << otherScreen << containment->screen();
}
*/
d->updateSceneRect();
connect(containment, SIGNAL(destroyed(QObject*)), this, SLOT(containmentDestroyed()));
connect(containment, SIGNAL(geometryChanged()), this, SLOT(updateSceneRect()));
connect(containment, SIGNAL(screenChanged(int, int, Plasma::Containment *)), this, SLOT(containmentScreenChanged(int, int, Plasma::Containment *)));
}
Containment *View::containment() const
{
return d->containment;
}
Containment *View::swapContainment(const QString &name, const QVariantList &args)
{
return swapContainment(d->containment, name, args);
}
Containment *View::swapContainment(Plasma::Containment *existing, const QString &name, const QVariantList &args)
{
if (!existing) {
return 0;
}
Containment *old = existing;
Plasma::Corona *corona = old->corona();
Plasma::Containment *c = corona->addContainment(name, args);
if (c) {
KConfigGroup oldConfig = old->config();
KConfigGroup newConfig = c->config();
// ensure that the old containments configuration is up to date
old->save(oldConfig);
// Copy configuration to new containment
oldConfig.copyTo(&newConfig);
if (old == d->containment) {
// set our containment to the new one, if the the old containment was us
setContainment(c);
}
// load the configuration of the old containment into the new one
c->restore(newConfig);
foreach (Applet *applet, c->applets()) {
applet->init();
// We have to flush the applet constraints manually
applet->flushPendingConstraintsEvents();
}
// destroy the old one
old->destroy(false);
// and now save the config
c->save(newConfig);
corona->requestConfigSync();
return c;
}
return old;
}
KConfigGroup View::config() const
{
KConfigGroup views(KGlobal::config(), "PlasmaViews");
return KConfigGroup(&views, QString::number(d->viewId));
}
void View::configNeedsSaving() const
{
Plasma::Corona *corona = qobject_cast<Plasma::Corona*>(scene());
if (corona) {
corona->requestConfigSync();
} else {
KGlobal::config()->sync();
}
}
int View::id() const
{
return d->viewId;
}
void View::setWallpaperEnabled(bool draw)
{
d->drawWallpaper = draw;
}
bool View::isWallpaperEnabled() const
{
return d->drawWallpaper;
}
void View::setTrackContainmentChanges(bool trackChanges)
{
d->trackChanges = trackChanges;
}
bool View::trackContainmentChanges()
{
return d->trackChanges;
}
View * View::topLevelViewAt(const QPoint & pos)
{
QWidget *w = QApplication::topLevelAt(pos);
if (w) {
Plasma::View *v = qobject_cast<Plasma::View *>(w);
return v;
} else {
return 0;
}
}
} // namespace Plasma
#include "view.moc"