369 lines
10 KiB
C++
369 lines
10 KiB
C++
/***************************************************************************
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* Copyright 2007 by Dan Meltzer <hydrogen@notyetimplemented.com> *
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* Copyright 2008 by Aaron Seigo <aseigo@kde.org> *
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* Copyright 2008 by Alexis Ménard <darktears31@gmail.com> *
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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* *
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* This program is distributed in the hope that it will be useful, *
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* but WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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* GNU General Public License for more details. *
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* *
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* You should have received a copy of the GNU General Public License *
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* along with this program; if not, write to the *
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* Free Software Foundation, Inc., *
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA . *
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***************************************************************************/
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#include "tooltipmanager.h"
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//Qt
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#include <QLabel>
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#include <QTimer>
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#include <QGridLayout>
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#include <QGraphicsView>
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#include <QDesktopWidget>
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//KDE
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#include <KWindowSystem>
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//X11
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#ifdef Q_WS_X11
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#include <QtGui/QX11Info>
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#include <X11/Xlib.h>
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#include <fixx11h.h>
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#endif
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//Plasma
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#include <plasma/applet.h>
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#include <plasma/containment.h>
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#include <plasma/panelsvg.h>
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#include <plasma/theme.h>
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#include <plasma/tooltip_p.h>
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#include <plasma/view.h>
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namespace Plasma
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{
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class ToolTipManagerPrivate
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{
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public :
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ToolTipManagerPrivate()
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: currentWidget(0)
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, showTimer(0)
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, hideTimer(0)
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{
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}
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~ToolTipManagerPrivate()
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{
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}
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void showToolTip();
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void resetShownState();
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/**
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* called when the theme of plasma has change
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*/
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void themeUpdated();
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/**
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* called when a widget inside the tooltip manager is deleted
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*/
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void onWidgetDestroyed(QObject * object);
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QGraphicsWidget *currentWidget;
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bool isShown;
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bool delayedHide;
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QTimer *showTimer;
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QTimer *hideTimer;
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QMap<QGraphicsWidget *, ToolTip *> tooltips;
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};
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//TOOLTIP IMPLEMENTATION
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class ToolTipManagerSingleton
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{
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public:
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ToolTipManagerSingleton()
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{
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}
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ToolTipManager self;
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};
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K_GLOBAL_STATIC( ToolTipManagerSingleton, privateInstance )
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ToolTipManager *ToolTipManager::self()
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{
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return &privateInstance->self;
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}
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ToolTipManager::ToolTipContent::ToolTipContent()
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: windowToPreview(0)
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{
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}
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bool ToolTipManager::ToolTipContent::isEmpty() const
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{
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return mainText.isEmpty() && subText.isEmpty() && image.isNull() && windowToPreview == 0;
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}
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ToolTipManager::ToolTipManager(QObject* parent)
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: QObject(parent),
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d(new ToolTipManagerPrivate)
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{
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connect(Plasma::Theme::defaultTheme(), SIGNAL(themeChanged()), this, SLOT(themeUpdated()));
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d->themeUpdated();
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d->showTimer = new QTimer(this);
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d->showTimer->setSingleShot(true);
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d->hideTimer = new QTimer(this);
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d->hideTimer->setSingleShot(true);
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connect(d->showTimer, SIGNAL(timeout()), SLOT(showToolTip()));
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connect(d->hideTimer, SIGNAL(timeout()), SLOT(resetShownState()));
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}
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ToolTipManager::~ToolTipManager()
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{
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delete d;
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}
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void ToolTipManager::showToolTip(QGraphicsWidget *widget)
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{
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ToolTip *tooltip = d->tooltips.value(widget);
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if (tooltip) {
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if (d->currentWidget) {
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hideToolTip(d->currentWidget);
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}
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d->hideTimer->stop();
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d->delayedHide = false;
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d->showTimer->stop();
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d->currentWidget = widget;
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if (d->isShown) {
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// small delay to prevent unnecessary showing when the mouse is moving quickly across items
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// which can be too much for less powerful CPUs to keep up with
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d->showTimer->start(200);
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} else {
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d->showTimer->start(500);
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}
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}
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}
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bool ToolTipManager::isWidgetToolTipDisplayed(QGraphicsWidget *widget)
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{
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ToolTip *tooltip = d->tooltips.value(widget);
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if (tooltip) {
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return tooltip->isVisible();
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} else {
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return false;
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}
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}
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void ToolTipManager::delayedHideToolTip()
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{
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d->showTimer->stop(); // stop the timer to show the tooltip
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d->delayedHide = true;
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d->hideTimer->start(250);
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}
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void ToolTipManager::hideToolTip(QGraphicsWidget *widget)
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{
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ToolTip *tooltip = d->tooltips.value(widget);
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if (tooltip) {
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d->showTimer->stop(); // stop the timer to show the tooltip
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d->delayedHide = false;
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d->currentWidget = 0;
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tooltip->hide();
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}
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}
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void ToolTipManager::registerWidget(QGraphicsWidget *widget)
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{
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if (!d->tooltips.contains(widget)) {
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//the tooltip is not registered we add it in our map of tooltips
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d->tooltips.insert(widget, 0);
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widget->installEventFilter(this);
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//connect to object destruction
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connect(widget, SIGNAL(destroyed(QObject *)),this,SLOT(onWidgetDestroyed(QObject *)));
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}
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}
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void ToolTipManager::unregisterWidget(QGraphicsWidget *widget)
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{
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if (!d->tooltips.contains(widget)) {
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return;
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}
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widget->removeEventFilter(this);
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ToolTip *tooltip = d->tooltips.take(widget);
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if (tooltip) {
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delete tooltip;
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}
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}
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void ToolTipManager::setToolTipContent(QGraphicsWidget *widget, const ToolTipContent &data)
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{
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if (!d->tooltips.contains(widget)) {
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registerWidget(widget);
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}
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ToolTip *tooltip = d->tooltips.value(widget);
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if (data.isEmpty()) {
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delete tooltip;
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d->tooltips.insert(widget, 0);
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return;
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}
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if (!tooltip) {
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tooltip = new ToolTip(widget);
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d->tooltips.insert(widget, tooltip);
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}
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tooltip->setContent(data);
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tooltip->updateTheme();
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}
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bool ToolTipManager::widgetHasToolTip(QGraphicsWidget *widget) const
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{
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return d->tooltips.contains(widget);
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}
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void ToolTipManagerPrivate::themeUpdated()
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{
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QMapIterator<QGraphicsWidget*, ToolTip *> iterator(tooltips);
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while (iterator.hasNext()) {
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iterator.next();
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if (iterator.value()) {
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iterator.value()->updateTheme();
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}
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}
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}
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void ToolTipManagerPrivate::onWidgetDestroyed(QObject *object)
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{
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if (!object) {
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return;
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}
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// we do a static_cast here since it really isn't a QGraphicsWidget by this
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// point anymore since we are in the QObject dtor. we don't actually
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// try and do anything with it, we just need the value of the pointer
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// so this unsafe looking code is actually just fine.
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//
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// NOTE: DO NOT USE THE w VARIABLE FOR ANYTHING OTHER THAN COMPARING
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// THE ADDRESS! ACTUALLY USING THE OBJECT WILL RESULT IN A CRASH!!!
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QGraphicsWidget *w = static_cast<QGraphicsWidget*>(object);
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if (currentWidget == w) {
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currentWidget = 0;
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showTimer->stop(); // stop the timer to show the tooltip
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delayedHide = false;
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}
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QMapIterator<QGraphicsWidget*, ToolTip *> iterator(tooltips);
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while (iterator.hasNext()) {
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iterator.next();
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if (iterator.key() == w) {
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ToolTip *tooltip = iterator.value();
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tooltips.remove(iterator.key());
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if (tooltip) {
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tooltip->hide();
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delete tooltip;
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}
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}
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}
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}
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void ToolTipManagerPrivate::resetShownState()
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{
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if (currentWidget) {
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ToolTip * tooltip = tooltips.value(currentWidget);
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if (tooltip && (!tooltip->isVisible() || delayedHide)) {
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//One might have moused out and back in again
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delayedHide = false;
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isShown = false;
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tooltip->hide();
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currentWidget = 0;
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}
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}
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}
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void ToolTipManagerPrivate::showToolTip()
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{
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if (!currentWidget) {
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return;
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}
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ToolTip *tooltip = tooltips.value(currentWidget);
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if (tooltip) {
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tooltip->prepareShowing();
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tooltip->move(popupPosition(currentWidget, tooltip->size()));
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isShown = true; //ToolTip is visible
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}
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}
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bool ToolTipManager::eventFilter(QObject *watched, QEvent *event)
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{
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QGraphicsWidget * widget = dynamic_cast<QGraphicsWidget *>(watched);
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if (!widget) {
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return QObject::eventFilter(watched, event);
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}
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switch (event->type()) {
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case QEvent::GraphicsSceneHoverMove:
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// If the tooltip isn't visible, run through showing the tooltip again
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// so that it only becomes visible after a stationary hover
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if (Plasma::ToolTipManager::self()->isWidgetToolTipDisplayed(widget)) {
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break;
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}
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// Don't restart the show timer on a mouse move event if there hasn't
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// been an enter event or the current widget has been cleared by a click
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// or wheel event.
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if (!d->currentWidget) {
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break;
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}
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case QEvent::GraphicsSceneHoverEnter:
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{
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// Check that there is a tooltip to show
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if (!widgetHasToolTip(widget)) {
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break;
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}
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// If the mouse is in the widget's area at the time that it is being
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// created the widget can receive a hover event before it is fully
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// initialized, in which case view() will return 0.
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QGraphicsView *parentView = viewFor(widget);
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if (parentView) {
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showToolTip(widget);
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}
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break;
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}
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case QEvent::GraphicsSceneHoverLeave:
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delayedHideToolTip();
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break;
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case QEvent::GraphicsSceneMousePress:
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case QEvent::GraphicsSceneWheel:
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hideToolTip(widget);
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default:
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break;
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}
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return QObject::eventFilter(watched,event);
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}
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} // Plasma namespace
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#include "tooltipmanager.moc"
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