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plasma-framework/extenderitem.cpp
Rob Scheepmaker 1f7f9b95ed Support setting QGraphicsItems in ExtenderItem as discussed in the extender api review 
discussion on the mailing list.


svn path=/trunk/KDE/kdebase/workspace/libs/plasma/; revision=862687
2008-09-19 16:23:08 +00:00

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/*
* Copyright 2008 by Rob Scheepmaker <r.scheepmaker@student.utwente.nl>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301 USA
*/
#include "extenderitem.h"
#include <QApplication>
#include <QAction>
#include <QGraphicsSceneResizeEvent>
#include <QGraphicsSceneMouseEvent>
#include <QGraphicsLinearLayout>
#include <QLayout>
#include <QPainter>
#include <QTimer>
#include <KDebug>
#include <KIcon>
#include <KWindowSystem>
#include "applet.h"
#include "containment.h"
#include "corona.h"
#include "dialog.h"
#include "extender.h"
#include "panelsvg.h"
#include "popupapplet.h"
#include "theme.h"
#include "view.h"
#include "private/applet_p.h"
#include "private/extender_p.h"
namespace Plasma
{
class ExtenderItemPrivate
{
public:
ExtenderItemPrivate(ExtenderItem *extenderItem, Extender *hostExtender)
: q(extenderItem),
widget(0),
toplevel(0),
previousTargetExtender(0),
extender(hostExtender),
title(QString()),
sourceAppletId(hostExtender->d->applet->id()),
mousePressed(false),
expirationTimer(0)
{
}
~ExtenderItemPrivate()
{
delete toplevel;
}
/**
* @return a Rect containing the area of the detachable where the draghandle can be drawn.
*/
QRectF dragHandleRect()
{
qreal left, top, right, bottom;
dragger->getMargins(left, top, right, bottom);
QRectF rect(0, 0, q->size().width(),
dragger->elementSize("hint-preferred-icon-size").height() + top + bottom);
return rect;
}
QRectF titleRect()
{
qreal left, top, right, bottom;
dragger->getMargins(left, top, right, bottom);
return dragHandleRect().adjusted(left + collapseIcon->size().width() + 1, top,
-toolbox->size().width(), -bottom);
}
//XXX kinda duplicated from applethandle.
//returns true if the applet overlaps with a different view then the current one.
bool leaveCurrentView(const QRect &rect)
{
if ((q->sceneBoundingRect().left() < 0)) {
//always leaveCurrentView when the item is in a Plasma::Dialog which can easy be
//seen by checking if it is in topleft quadrant and it's not just there because it's
//being viewed by the toplevel view.
return true;
}
foreach (QWidget *widget, QApplication::topLevelWidgets()) {
if (widget->geometry().intersects(rect) && widget->isVisible() && widget != toplevel) {
//is this widget a plasma view, a different view then our current one,
//AND not a dashboardview?
QGraphicsView *v = qobject_cast<QGraphicsView*>(widget);
QGraphicsView *currentV = 0;
if (hostApplet()) {
currentV = qobject_cast<QGraphicsView*>(hostApplet()->containment()->view());
}
if (v && v != currentV) {
return true;
}
}
}
return false;
}
QRect screenRect() {
return hostApplet()->containment()->view()
->mapFromScene(q->sceneBoundingRect()).boundingRect();
}
void toggleCollapse() {
q->setCollapsed(!q->isCollapsed());
}
void updateToolBox() {
if (toolbox && dragger && toolboxLayout) {
//clean the layout.
uint iconHeight = dragger->elementSize("hint-preferred-icon-size").height();
while (toolboxLayout->count()) {
QGraphicsLayoutItem *icon = toolboxLayout->itemAt(0);
QGraphicsWidget *widget = dynamic_cast<QGraphicsWidget*>(icon);
widget->deleteLater();
toolboxLayout->removeAt(0);
}
//add the actions that are actually set to visible.
foreach (QAction *action, actions) {
if (action->isVisible()) {
Icon *icon = new Icon(q);
icon->setAction(action);
QSizeF iconSize = icon->sizeFromIconSize(iconHeight);
icon->setMinimumSize(iconSize);
icon->setMaximumSize(iconSize);
toolboxLayout->addItem(icon);
}
}
toolboxLayout->updateGeometry();
qreal left, top, right, bottom;
dragger->getMargins(left, top, right, bottom);
//position the toolbox correctly.
QSizeF minimum = toolboxLayout->minimumSize();
toolbox->resize(minimum);
toolbox->setPos(q->size().width() - minimum.width(),
((dragger->size().height() + top + bottom)/2) -
(minimum.height()/2));
toolbox->update();
}
}
//TODO: something like this as static function in corona might be a good idea.
QPointF scenePosFromScreenPos(const QPoint &pos) const
{
//get the stacking order of the toplevel windows and remove the toplevel view that's
//only here while dragging, since we're not interested in finding that.
QList<WId> order = KWindowSystem::stackingOrder();
if (toplevel) {
order.removeOne(toplevel->winId());
}
QGraphicsView *found = 0;
foreach (QWidget *w, QApplication::topLevelWidgets()) {
QGraphicsView *v = 0;
//first check if we're over a Dialog.
Dialog *dialog = qobject_cast<Dialog*>(w);
if (dialog) {
if (dialog->isVisible() && dialog->geometry().contains(pos)) {
v = qobject_cast<QGraphicsView*>(dialog->layout()->itemAt(0)->widget());
if (v) {
return v->mapToScene(v->mapFromGlobal(pos));
}
}
} else {
v = qobject_cast<QGraphicsView *>(w);
}
//else check if it is a QGV:
if (v && w->isVisible() && w->geometry().contains(pos)) {
if (found && order.contains(found->winId())) {
if (order.indexOf(found->winId()) < order.indexOf(v->winId())) {
found = v;
}
} else {
found = v;
}
}
}
if (!found) {
return QPointF();
}
return found->mapToScene(found->mapFromGlobal(pos));
}
Applet *hostApplet() const
{
if (extender) {
return extender->d->applet;
} else {
return 0;
}
}
ExtenderItem *q;
QGraphicsItem *widget;
QGraphicsWidget *toolbox;
QGraphicsLinearLayout *toolboxLayout;
QGraphicsView *toplevel;
Extender *previousTargetExtender;
Extender *extender;
Applet *sourceApplet;
KConfigGroup config;
PanelSvg *dragger;
PanelSvg *appletBackground;
Icon *collapseIcon;
QAction *returnAction;
QMap<QString, QAction*> actions;
QString title;
QString name;
uint sourceAppletId;
uint extenderItemId;
QPointF deltaScene;
QPoint mousePos;
bool mousePressed;
bool mouseOver;
QTimer *expirationTimer;
static uint s_maxExtenderItemId;
};
uint ExtenderItemPrivate::s_maxExtenderItemId = 0;
ExtenderItem::ExtenderItem(Extender *hostExtender, uint extenderItemId)
: QGraphicsWidget(hostExtender),
d(new ExtenderItemPrivate(this, hostExtender))
{
Q_ASSERT(hostExtender);
//set the extenderId
if (extenderItemId) {
d->extenderItemId = extenderItemId;
ExtenderItemPrivate::s_maxExtenderItemId =
qMax(ExtenderItemPrivate::s_maxExtenderItemId, extenderItemId);
} else {
d->extenderItemId = ++ExtenderItemPrivate::s_maxExtenderItemId;
}
d->sourceApplet = hostExtender->d->applet;
//create items's configgroup
if (hostExtender->d->applet) {
KConfigGroup cg = hostExtender->d->applet->config("ExtenderItems");
KConfigGroup dg = KConfigGroup(&cg, QString::number(d->extenderItemId));
if (!dg.readEntry("sourceAppletId", 0)) {
//The item is new
dg.writeEntry("sourceAppletPluginName", hostExtender->d->applet->pluginName());
dg.writeEntry("sourceAppletId", hostExtender->d->applet->id());
d->sourceAppletId = hostExtender->d->applet->id();
d->sourceApplet = hostExtender->d->applet;
} else {
//The item allready exists.
d->name = dg.readEntry("extenderItemName", "");
d->sourceAppletId = dg.readEntry("sourceAppletId", 0);
//Set the sourceapplet.
Corona *corona = hostExtender->d->applet->containment()->corona();
foreach (Containment *containment, corona->containments()) {
foreach (Applet *applet, containment->applets()) {
if (applet->id() == d->sourceAppletId &&
applet->pluginName() == dg.readEntry("sourceAppletPluginName", "")) {
d->sourceApplet = applet;
}
}
}
}
}
//create the dragger and standard applet background.
d->dragger = new PanelSvg(this);
d->dragger->setImagePath("widgets/dragger");
d->appletBackground = new PanelSvg(this);
d->appletBackground->setImagePath("widgets/background");
d->appletBackground->setEnabledBorders(0);
//create the toolbox.
d->toolbox = new QGraphicsWidget(this);
d->toolboxLayout = new QGraphicsLinearLayout(d->toolbox);
d->toolbox->setLayout(d->toolboxLayout);
//allow the theme to set the size of the icon.
//TODO: discuss with others to determine details of the theming implementation. I don't really
//like this approach, but it works...
QSizeF iconSize = d->dragger->elementSize("hint-preferred-icon-size");
qreal left, top, right, bottom;
d->dragger->getMargins(left, top, right, bottom);
//create the collapse/applet icon.
d->collapseIcon = new Icon(KIcon(hostExtender->d->applet->icon()), "", this);
d->collapseIcon->resize(d->collapseIcon->sizeFromIconSize(iconSize.height()));
d->collapseIcon->setPos(left, (d->dragger->size().height() + top + bottom)/2 -
d->collapseIcon->size().height()/2);
connect(d->collapseIcon, SIGNAL(clicked()), this, SLOT(toggleCollapse()));
//Add the return to source action.
d->returnAction = new QAction(this);
d->returnAction->setIcon(KIcon("returntosource"));
d->returnAction->setEnabled(true);
d->returnAction->setVisible(true);
connect(d->returnAction, SIGNAL(triggered()), this, SLOT(moveBackToSource()));
addAction("returntosource", d->returnAction);
//set the extender we want to move to.
setExtender(hostExtender);
setCollapsed(false); //sets the size hints.
setAcceptHoverEvents(true);
d->updateToolBox();
updateGeometry();
}
ExtenderItem::~ExtenderItem()
{
delete d;
}
KConfigGroup ExtenderItem::config() const
{
KConfigGroup cg = d->extender->d->applet->config("ExtenderItems");
return KConfigGroup(&cg, QString::number(d->extenderItemId));
}
void ExtenderItem::setTitle(const QString &title)
{
d->title = title;
update();
}
QString ExtenderItem::title() const
{
return d->title;
}
void ExtenderItem::setName(const QString &name)
{
d->name = name;
config().writeEntry("extenderItemName", name);
}
QString ExtenderItem::name() const
{
return d->name;
}
void ExtenderItem::setWidget(QGraphicsItem *widget)
{
qreal left, top, right, bottom;
d->dragger->getMargins(left, top, right, bottom);
widget->setParentItem(this);
widget->setPos(QPointF(left, d->dragHandleRect().height() + bottom));
d->widget = widget;
setCollapsed(isCollapsed()); //updates the size hints.
}
QGraphicsItem *ExtenderItem::widget() const
{
return d->widget;
}
void ExtenderItem::setIcon(const QIcon &icon)
{
d->collapseIcon->setIcon(icon);
}
void ExtenderItem::setIcon(const QString &icon)
{
d->collapseIcon->setIcon(icon);
}
QIcon ExtenderItem::icon() const
{
return d->collapseIcon->icon();
}
void ExtenderItem::setExtender(Extender *extender, const QPointF &pos)
{
if (extender == d->extender) {
//We're not moving between extenders, so just insert this item back into the layout.
setParentItem(extender);
extender->d->addExtenderItem(this, pos);
return;
}
//We are switching extender...
//first remove this item from the old extender.
if (d->extender) {
d->extender->d->removeExtenderItem(this);
emit d->extender->itemDetached(this);
//collapse the popupapplet if the last item is removed.
if (!d->extender->attachedItems().count()) {
PopupApplet *applet = qobject_cast<PopupApplet*>(d->extender->d->applet);
if (applet) {
applet->hidePopup();
}
}
}
//move the configuration.
if (d->hostApplet() && (extender != d->extender)) {
KConfigGroup c = extender->d->applet->config("ExtenderItems");
config().reparent(&c);
}
d->extender = extender;
//change parent.
setParentItem(extender);
extender->d->addExtenderItem(this, pos);
//cancel the timer.
if (d->expirationTimer && isDetached()) {
d->expirationTimer->stop();
delete d->expirationTimer;
d->expirationTimer = 0;
}
}
Extender *ExtenderItem::extender() const
{
return d->extender;
}
bool ExtenderItem::isCollapsed() const
{
if (!d->widget) {
return true;
} else {
return !d->widget->isVisible();
}
}
void ExtenderItem::setAutoExpireDelay(uint time)
{
if (!time) {
if (d->expirationTimer) {
d->expirationTimer->stop();
delete d->expirationTimer;
d->expirationTimer = 0;
}
return;
}
if (!isDetached()) {
if (!d->expirationTimer) {
d->expirationTimer = new QTimer(this);
connect(d->expirationTimer, SIGNAL(timeout()), this, SLOT(destroy()));
}
d->expirationTimer->stop();
d->expirationTimer->setSingleShot(true);
d->expirationTimer->setInterval(time);
d->expirationTimer->start();
}
}
bool ExtenderItem::autoExpireDelay() const
{
if (d->expirationTimer) {
return d->expirationTimer->interval();
} else {
return 0;
}
}
bool ExtenderItem::isDetached() const
{
if (d->hostApplet()) {
return (sourceAppletId() != d->hostApplet()->id());
} else {
return false;
}
}
void ExtenderItem::addAction(const QString &name, QAction *action)
{
Q_ASSERT(action);
d->actions[name] = action;
connect(action, SIGNAL(changed()), this, SLOT(updateToolBox()));
d->updateToolBox();
}
QAction *ExtenderItem::action(const QString &name) const
{
if (d->actions.contains(name)) {
return d->actions[name];
} else {
return 0;
}
}
uint ExtenderItem::sourceAppletId() const
{
return d->sourceAppletId;
}
void ExtenderItem::destroy()
{
if (d->mousePressed) {
//avoid being destroyed while we're being dragged.
return;
}
d->hostApplet()->config("ExtenderItems").deleteGroup(QString::number(d->extenderItemId));
if (d->extender) {
d->extender->d->removeExtenderItem(this);
}
deleteLater();
}
void ExtenderItem::setCollapsed(bool collapsed)
{
if (!d->widget) {
setPreferredSize(QSizeF(200, d->dragHandleRect().height()));
setMinimumSize(QSizeF(0, d->dragHandleRect().height()));
//FIXME: wasn't there some sort of QWIDGETMAXSIZE thingy?
setMaximumSize(QSizeF(1000, d->dragHandleRect().height()));
setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Fixed);
updateGeometry();
return;
}
qreal left, top, right, bottom;
d->dragger->getMargins(left, top, right, bottom);
d->widget->setVisible(!collapsed);
QSizeF minimumSize;
QSizeF preferredSize;
QSizeF maximumSize;
if (d->widget->isWidget()) {
QGraphicsWidget *graphicsWidget = static_cast<QGraphicsWidget*>(d->widget);
minimumSize = graphicsWidget->minimumSize();
preferredSize = graphicsWidget->preferredSize();
maximumSize = graphicsWidget->maximumSize();
} else {
minimumSize = d->widget->boundingRect().size();
preferredSize = d->widget->boundingRect().size();
maximumSize = d->widget->boundingRect().size();
}
if (collapsed) {
setPreferredSize(QSizeF(preferredSize.width() + left + right,
d->dragHandleRect().height()));
setMinimumSize(QSizeF(minimumSize.width() + left + right,
d->dragHandleRect().height()));
setMaximumSize(QSizeF(maximumSize.width() + left + right,
d->dragHandleRect().height()));
setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Fixed);
//FIXME: why don't tooltips work?
if (d->collapseIcon) {
d->collapseIcon->setToolTip(i18n("Expand this widget"));
}
} else {
setPreferredSize(QSizeF(preferredSize.width() + left + right,
preferredSize.height() +
d->dragHandleRect().height() + top + bottom));
setMinimumSize( QSizeF(minimumSize.width() + left + right,
minimumSize.height() +
d->dragHandleRect().height() + top + bottom));
setMaximumSize( QSizeF(maximumSize.width() + left + right,
maximumSize.height() +
d->dragHandleRect().height() + top + bottom));
if (d->widget->isWidget()) {
QGraphicsWidget *graphicsWidget = static_cast<QGraphicsWidget*>(d->widget);
setSizePolicy(graphicsWidget->sizePolicy());
} else {
setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Fixed);
}
if (d->collapseIcon) {
d->collapseIcon->setToolTip(i18n("Collapse this widget"));
}
}
updateGeometry();
if (d->extender) {
d->extender->d->adjustSizeHints();
}
}
void ExtenderItem::moveBackToSource()
{
if (!d->sourceApplet) {
return;
}
setExtender(d->sourceApplet->d->extender);
}
void ExtenderItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *option,
QWidget *widget)
{
Q_UNUSED(option);
Q_UNUSED(widget);
painter->setRenderHint(QPainter::TextAntialiasing, true);
painter->setRenderHint(QPainter::Antialiasing, true);
if (d->mousePressed) {
//only paint the standard applet background when dragging the thing around.
d->appletBackground->paintPanel(painter); //, QRectF(QPointF(0,0), size()));
}
d->dragger->paintPanel(painter); //, d->dragHandleRect());
//draw the title.
Plasma::Theme *theme = Plasma::Theme::defaultTheme();
QFont font = theme->font(Plasma::Theme::DefaultFont);
font.setPointSize(font.pointSize() - 2);
font.setWeight(QFont::Bold);
//XXX: duplicated from windowtaskitem.
//TODO: hmm, create something generic for this... there's probably more stuff that wants to have
//this functionality
QRectF rect = QRectF(d->titleRect().width() - 30, 0, 30, d->titleRect().height());
QPixmap pixmap(d->titleRect().size().toSize());
pixmap.fill(Qt::transparent);
QPainter p(&pixmap);
p.setPen(theme->color(Plasma::Theme::TextColor));
p.setFont(font);
p.drawText(QRectF(QPointF(0, 0), d->titleRect().size()),
Qt::TextSingleLine | Qt::AlignVCenter | Qt::AlignLeft,
d->title);
// Create the alpha gradient for the fade out effect
QLinearGradient alphaGradient(0, 0, 1, 0);
alphaGradient.setCoordinateMode(QGradient::ObjectBoundingMode);
//TODO: correct handling of right to left text.
alphaGradient.setColorAt(0, QColor(0, 0, 0, 255));
alphaGradient.setColorAt(1, QColor(0, 0, 0, 0));
p.setCompositionMode(QPainter::CompositionMode_DestinationIn);
p.fillRect(rect, alphaGradient);
p.end();
painter->drawPixmap(d->titleRect().topLeft(), pixmap);
}
void ExtenderItem::resizeEvent(QGraphicsSceneResizeEvent *event)
{
qreal left, top, right, bottom;
d->dragger->getMargins(left, top, right, bottom);
//resize the dragger
QSizeF newDraggerSize = event->newSize();
newDraggerSize.setHeight(d->dragger->elementSize("hint-preferred-icon-size").height() + top + bottom);
d->dragger->resizePanel(newDraggerSize);
//resize the applet background
d->appletBackground->resizePanel(event->newSize());
//resize the widget
if (d->widget && d->widget->isWidget()) {
QSizeF newWidgetSize = event->newSize();
newWidgetSize.setHeight(newWidgetSize.height() - d->dragger->size().height() - top - bottom);
newWidgetSize.setWidth(newWidgetSize.width() - left - right);
QGraphicsWidget *graphicsWidget = static_cast<QGraphicsWidget*>(d->widget);
graphicsWidget->resize(newWidgetSize);
}
d->updateToolBox();
}
void ExtenderItem::mousePressEvent(QGraphicsSceneMouseEvent *event)
{
if (!(d->dragHandleRect().contains(event->pos()))) {
event->ignore();
return;
}
d->mousePressed = true;
d->deltaScene = pos();
Applet *parentApplet = d->hostApplet();
d->mousePos = event->pos().toPoint();
parentApplet->raise();
setZValue(parentApplet->zValue());
if (d->extender) {
QPointF mousePos = d->scenePosFromScreenPos(event->screenPos());
if (!mousePos.isNull()) {
d->extender->itemHoverMoveEvent(this, d->extender->mapFromScene(mousePos));
}
}
d->extender->d->removeExtenderItem(this);
QApplication::setOverrideCursor(Qt::ClosedHandCursor);
}
void ExtenderItem::mouseMoveEvent(QGraphicsSceneMouseEvent *event)
{
if (!d->mousePressed) {
return;
}
//keep track of the movement in scene coordinates. we use this to set the position of the
//applet when remaining in the current view.
d->deltaScene += event->scenePos() - event->lastScenePos();
//set a rect in screencoordinates so we can check when we need to move to a toplevel
//view.
QRect screenRect = QRect();
screenRect.setTopLeft(event->screenPos() - d->mousePos);
screenRect.setSize(d->screenRect().size());
Corona *corona = d->hostApplet()->containment()->corona();
if (d->leaveCurrentView(screenRect)) {
//we're moving the applet to a toplevel view, so place it somewhere out of sight
//first: in the topleft quadrant.
if (!d->toplevel) {
//FIXME: duplication from applethandle
//create a toplevel view and aim it at the applet.
d->toplevel = new QGraphicsView(corona, 0);
corona->addOffscreenWidget(this);
d->toplevel->setWindowFlags(Qt::ToolTip | Qt::FramelessWindowHint
| Qt::WindowStaysOnTopHint);
d->toplevel->setFrameShape(QFrame::NoFrame);
d->toplevel->resize(screenRect.size());
d->toplevel->setSceneRect(sceneBoundingRect());
d->toplevel->centerOn(this);
//We might have to scale the view, because we might be zoomed out.
qreal scale = screenRect.width() / boundingRect().width();
d->toplevel->scale(scale, scale);
d->toplevel->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
d->toplevel->setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
d->toplevel->update();
d->toplevel->show();
}
//move the toplevel view.
d->toplevel->setSceneRect(sceneBoundingRect());
d->toplevel->setGeometry(screenRect);
update();
} else {
corona->removeOffscreenWidget(this);
setParentItem(d->hostApplet());
setPos(d->deltaScene);
//remove the toplevel view.
if (d->toplevel) {
delete d->toplevel;
d->toplevel = 0;
}
}
//let's insert spacers in applets we're hovering over for some usefull visual feedback.
//check which view we're hovering over and use that information to get the mouse
//position in scene coordinates (event->scenePos won't work, since it doesn't take in
//consideration that you're leaving the current view).
QPointF mousePos = d->scenePosFromScreenPos(event->screenPos());
//find the extender we're hovering over.
Extender *targetExtender = 0;
if (!mousePos.isNull()) {
foreach (Containment *containment, corona->containments()) {
foreach (Applet *applet, containment->applets()) {
if (applet->d->extender &&
(applet->sceneBoundingRect().contains(mousePos) ||
applet->d->extender->sceneBoundingRect().contains(mousePos))) {
targetExtender = applet->d->extender;
//check if we're hovering over an popupapplet, and open it up in case it does.
PopupApplet *popupApplet = qobject_cast<PopupApplet*>(applet);
if (popupApplet && (applet->formFactor() == Plasma::Horizontal ||
applet->formFactor() == Plasma::Vertical)) {
popupApplet->showPopup();
}
}
}
}
}
//remove any previous spacers.
if (targetExtender != d->previousTargetExtender) {
if (d->previousTargetExtender) {
d->previousTargetExtender->itemHoverLeaveEvent(this);
}
d->previousTargetExtender = targetExtender;
if (targetExtender) {
targetExtender->itemHoverEnterEvent(this);
}
}
//insert a spacer if the applet accepts detachables.
if (targetExtender) {
if (targetExtender->sceneBoundingRect().contains(mousePos)) {
targetExtender->itemHoverMoveEvent(this, targetExtender->mapFromScene(mousePos));
}
}
}
void ExtenderItem::hoverMoveEvent(QGraphicsSceneHoverEvent *event)
{
if (d->titleRect().contains(event->pos())) {
if (!d->mouseOver) {
QApplication::setOverrideCursor(Qt::OpenHandCursor);
d->mouseOver = true;
}
} else {
if (d->mouseOver) {
QApplication::restoreOverrideCursor();
d->mouseOver = false;
}
}
}
void ExtenderItem::hoverLeaveEvent(QGraphicsSceneHoverEvent *event)
{
Q_UNUSED(event);
if (d->mouseOver) {
QApplication::restoreOverrideCursor();
d->mouseOver = false;
}
}
void ExtenderItem::mouseReleaseEvent(QGraphicsSceneMouseEvent *event)
{
if (d->mousePressed) {
d->mousePressed = false;
//remove the toplevel view
if (d->toplevel) {
delete d->toplevel;
d->toplevel = 0;
}
//let's insert spacers in applets we're hovering over for some usefull visual feedback.
//check which view we're hovering over and use that information to get the mouse
//position in scene coordinates (event->scenePos won't work, since it doesn't take in
//consideration that you're leaving the current view).
QPointF mousePos = d->scenePosFromScreenPos(event->screenPos());
//find the extender we're hovering over.
Extender *targetExtender = 0;
Corona *corona = qobject_cast<Corona*>(scene());
corona->removeOffscreenWidget(this);
if (!mousePos.isNull()) {
foreach (Containment *containment, corona->containments()) {
foreach (Applet *applet, containment->applets()) {
if (applet->d->extender &&
(applet->sceneBoundingRect().contains(mousePos) ||
applet->d->extender->sceneBoundingRect().contains(mousePos))) {
targetExtender = applet->d->extender;
}
}
}
}
//are we hovering over an applet that accepts extender items?
if (targetExtender) {
if (targetExtender->sceneBoundingRect().contains(mousePos)) {
setExtender(targetExtender, targetExtender->mapFromScene(mousePos));
} else {
setExtender(targetExtender);
}
} else {
//apparently, it is not, so instantiate a new ExtenderApplet.
//TODO: maybe we alow the user to choose a default extenderapplet.
kDebug() << "Instantiate a new ExtenderApplet";
mousePos = d->scenePosFromScreenPos(event->screenPos() - d->mousePos);
if (!mousePos.isNull()) {
foreach (Containment *containment, corona->containments()) {
if (containment->sceneBoundingRect().contains(mousePos)) {
Applet *applet = containment->addApplet("internal:extender",
QVariantList(),
QRectF(mousePos, size()));
setExtender(applet->d->extender);
}
}
}
}
QApplication::restoreOverrideCursor();
}
}
} // namespace Plasma
#include "extenderitem.moc"
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