plasma-framework/extender.cpp

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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 "extender.h"
#include <QAction>
#include <QGraphicsGridLayout>
#include <QGraphicsLinearLayout>
#include "applet.h"
#include "containment.h"
#include "corona.h"
#include "extenderitem.h"
#include "widgets/label.h"
#include "private/applet_p.h"
#include "private/extender_p.h"
namespace Plasma
{
Extender::Extender(Applet *applet)
: QGraphicsWidget(applet),
d(new ExtenderPrivate(applet, this))
{
applet->d->extender = this;
d->layout = new QGraphicsLinearLayout(this);
d->layout->setOrientation(Qt::Vertical);
setLayout(d->layout);
d->emptyExtenderLabel = new Label(this);
d->emptyExtenderLabel->setText(d->emptyExtenderMessage);
d->emptyExtenderLabel->setMinimumSize(QSizeF(150, 64));
d->emptyExtenderLabel->setPreferredSize(QSizeF(200, 64));
d->emptyExtenderLabel->setSizePolicy(QSizePolicy::MinimumExpanding, QSizePolicy::Preferred);
d->layout->addItem(d->emptyExtenderLabel);
d->adjustSizeHints();
d->loadExtenderItems();
}
Extender::~Extender()
{
d->applet->d->extender = 0;
delete d;
}
void Extender::setEmptyExtenderMessage(const QString &message)
{
d->emptyExtenderMessage = message;
if (d->emptyExtenderLabel) {
d->emptyExtenderLabel->setText(message);
}
}
QString Extender::emptyExtenderMessage() const
{
return d->emptyExtenderMessage;
}
QList<ExtenderItem*> Extender::items() const
{
QList<ExtenderItem*> result;
//FIXME: a triple nested loop ... ew. there should be a more efficient way to do this
//iterate through all extenders we can find and check each extenders source applet.
foreach (Containment *c, d->applet->containment()->corona()->containments()) {
foreach (Applet *applet, c->applets()) {
if (applet->d->extender) {
foreach (ExtenderItem *item, applet->d->extender->attachedItems()) {
if (item->sourceAppletId() == d->applet->id()) {
result.append(item);
}
}
}
}
}
return result;
}
QList<ExtenderItem*> Extender::attachedItems() const
{
return d->attachedExtenderItems;
}
QList<ExtenderItem*> Extender::detachedItems() const
{
QList<ExtenderItem*> result;
foreach (ExtenderItem *item, items()) {
if (item->isDetached()) {
result.append(item);
}
}
return result;
}
ExtenderItem *Extender::item(const QString &name) const
{
foreach (ExtenderItem *item, items()) {
if (item->name() == name) {
return item;
}
}
return 0;
}
void Extender::saveState()
{
kDebug() << "saving state";
foreach (ExtenderItem *item, attachedItems()) {
item->config().writeEntry("extenderItemPosition", item->geometry().y());
}
}
QVariant Extender::itemChange(GraphicsItemChange change, const QVariant &value)
{
if (change == QGraphicsItem::ItemPositionHasChanged) {
emit geometryChanged();
}
return QGraphicsWidget::itemChange(change, value);
}
void Extender::resizeEvent(QGraphicsSceneResizeEvent *event)
{
QGraphicsWidget::resizeEvent(event);
emit geometryChanged();
}
void Extender::itemAddedEvent(ExtenderItem *item, const QPointF &pos)
{
//this is a sane size policy imo.
item->setSizePolicy(QSizePolicy::MinimumExpanding, QSizePolicy::Fixed);
if (pos == QPointF(-1, -1)) {
d->layout->addItem(item);
} else {
d->layout->insertItem(d->insertIndexFromPos(pos), item);
}
//remove the empty extender message if needed.
if (d->emptyExtenderLabel) {
d->layout->removeItem(d->emptyExtenderLabel);
d->emptyExtenderLabel->hide();
}
d->adjustSizeHints();
}
void Extender::itemRemovedEvent(ExtenderItem *item)
{
d->layout->removeItem(item);
//add the empty extender message if needed.
if (!attachedItems().count() && !d->spacerWidget) {
d->emptyExtenderLabel->show();
d->emptyExtenderLabel->setMinimumSize(item->size());
//just in case:
d->layout->removeItem(d->emptyExtenderLabel);
d->layout->addItem(d->emptyExtenderLabel);
}
d->adjustSizeHints();
}
void Extender::itemHoverEnterEvent(ExtenderItem *item)
{
itemHoverMoveEvent(item, QPointF(0, 0));
}
void Extender::itemHoverMoveEvent(ExtenderItem *item, const QPointF &pos)
{
int insertIndex = d->insertIndexFromPos(pos);
if (insertIndex == d->currentSpacerIndex) {
//relayouting is resource intensive, so don't do that when not necesarry
return;
}
//Make sure we remove any spacer that might allready be in the layout.
itemHoverLeaveEvent(item);
d->currentSpacerIndex = insertIndex;
//Create a widget that functions as spacer, and add that to the layout.
QGraphicsWidget *widget = new QGraphicsWidget(this);
widget->setPreferredSize(QSizeF(item->size().width(), item->size().height()));
widget->setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Fixed);
d->spacerWidget = widget;
d->layout->insertItem(insertIndex, widget);
//Make sure we remove any 'no detachables' label that might be there, and update the layout.
//XXX: duplicated from itemAttachedEvent.
if (d->emptyExtenderLabel) {
d->layout->removeItem(d->emptyExtenderLabel);
d->emptyExtenderLabel->hide();
}
d->adjustSizeHints();
}
void Extender::itemHoverLeaveEvent(ExtenderItem *item)
{
Q_UNUSED(item);
if (d->spacerWidget) {
//Remove any trace of the spacer widget.
d->layout->removeItem(d->spacerWidget);
delete d->spacerWidget;
d->spacerWidget = 0;
d->currentSpacerIndex = -1;
//Make sure we add a 'no detachables' label when the layout is empty.
if (!attachedItems().count()) {
d->emptyExtenderLabel->show();
d->emptyExtenderLabel->setMinimumSize(item->size());
d->layout->removeItem(d->emptyExtenderLabel);
d->layout->addItem(d->emptyExtenderLabel);
}
d->adjustSizeHints();
}
}
ExtenderPrivate::ExtenderPrivate(Applet *applet, Extender *extender) :
q(extender),
applet(applet),
spacerWidget(0),
emptyExtenderMessage(i18n("no items")),
emptyExtenderLabel(0),
popup(false)
{
}
ExtenderPrivate::~ExtenderPrivate()
{
}
void ExtenderPrivate::addExtenderItem(ExtenderItem *item, const QPointF &pos)
{
attachedExtenderItems.append(item);
item->action("returntosource")->setVisible(item->isDetached());
q->itemAddedEvent(item, pos);
q->itemHoverLeaveEvent(item);
emit q->itemAttached(item);
}
void ExtenderPrivate::removeExtenderItem(ExtenderItem *item)
{
attachedExtenderItems.removeOne(item);
q->itemRemovedEvent(item);
}
void ExtenderPrivate::adjustSizeHints()
{
if (!q->layout()) {
return;
}
q->layout()->updateGeometry();
q->setMinimumSize(q->layout()->minimumSize());
q->setPreferredSize(q->layout()->preferredSize());
q->setMaximumSize(q->layout()->maximumSize());
q->updateGeometry();
}
int ExtenderPrivate::insertIndexFromPos(const QPointF &pos) const
{
int insertIndex = -1;
//XXX: duplicated from panel
if (pos != QPointF(-1, -1)) {
for (int i = 0; i < layout->count(); ++i) {
QRectF siblingGeometry = layout->itemAt(i)->geometry();
qreal middle = (siblingGeometry.top() + siblingGeometry.bottom()) / 2.0;
if (pos.y() < middle) {
insertIndex = i;
break;
} else if (pos.y() <= siblingGeometry.bottom()) {
insertIndex = i + 1;
break;
}
}
}
return insertIndex;
}
void ExtenderPrivate::loadExtenderItems()
{
KConfigGroup cg = applet->config("ExtenderItems");
//first create a list of extenderItems, and then sort them on their position, so the items get
//recreated in the correct order.
//TODO: this restoring of the correct order should now be done in itemAddedEvent instead of
//here, to allow easy subclassing of Extender.
QList<QPair<int, QString> > groupList;
foreach (const QString &extenderItemId, cg.groupList()) {
KConfigGroup dg = cg.group(extenderItemId);
groupList.append(qMakePair(dg.readEntry("extenderItemPosition", 0), extenderItemId));
}
qSort(groupList);
//iterate over the extender items
for (int i = 0; i < groupList.count(); i++) {
QPair<int, QString> pair = groupList[i];
KConfigGroup dg = cg.group(pair.second);
//load the relevant settings.
QString extenderItemId = dg.name();
QString extenderItemName = dg.readEntry("extenderItemName", "");
QString appletName = dg.readEntry("sourceAppletPluginName", "");
uint sourceAppletId = dg.readEntry("sourceAppletId", 0);
bool temporarySourceApplet = false;
//find the source applet.
Corona *corona = applet->containment()->corona();
Applet *sourceApplet = 0;
foreach (Containment *containment, corona->containments()) {
foreach (Applet *applet, containment->applets()) {
if (applet->id() == sourceAppletId) {
sourceApplet = applet;
}
}
}
//There is no source applet. We just instantiate one just for the sake of creating
//detachables.
if (!sourceApplet) {
kDebug() << "creating a temporary applet as factory";
sourceApplet = Applet::load(appletName);
temporarySourceApplet = true;
//TODO: maybe add an option to applet to indicate that it shouldn't be deleted after
//having used it as factory.
}
if (!sourceApplet) {
kDebug() << "sourceApplet is null? appletName = " << appletName;
kDebug() << " extenderItemId = " << extenderItemId;
} else {
ExtenderItem *item = new ExtenderItem(q, extenderItemId.toInt());
item->setName(extenderItemName);
sourceApplet->initExtenderItem(item);
if (temporarySourceApplet) {
delete sourceApplet;
}
}
}
adjustSizeHints();
}
} // Plasma namespace
#include "extender.moc"