385 lines
11 KiB
C++
385 lines
11 KiB
C++
/*
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* Copyright 2008 by Rob Scheepmaker <r.scheepmaker@student.utwente.nl>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301 USA
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*/
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#include "extender.h"
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#include <QAction>
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#include <QGraphicsGridLayout>
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#include <QGraphicsLinearLayout>
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#include "applet.h"
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#include "containment.h"
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#include "corona.h"
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#include "extenderitem.h"
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#include "popupapplet.h"
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#include "svg.h"
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#include "widgets/label.h"
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#include "private/applet_p.h"
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#include "private/extender_p.h"
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namespace Plasma
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{
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Extender::Extender(Applet *applet)
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: QGraphicsWidget(applet),
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d(new ExtenderPrivate(applet, this))
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{
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applet->d->extender = this;
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d->layout = new QGraphicsLinearLayout(this);
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d->layout->setOrientation(Qt::Vertical);
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d->layout->setContentsMargins(0, 0, 0, 0);
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d->layout->setSpacing(0);
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setLayout(d->layout);
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d->emptyExtenderLabel = new Label(this);
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d->emptyExtenderLabel->setText(d->emptyExtenderMessage);
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d->emptyExtenderLabel->setMinimumSize(QSizeF(150, 64));
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d->emptyExtenderLabel->setPreferredSize(QSizeF(200, 64));
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d->emptyExtenderLabel->setSizePolicy(QSizePolicy::MinimumExpanding, QSizePolicy::Preferred);
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d->layout->addItem(d->emptyExtenderLabel);
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d->adjustSizeHints();
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d->loadExtenderItems();
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}
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Extender::~Extender()
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{
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d->applet->d->extender = 0;
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delete d;
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}
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void Extender::setEmptyExtenderMessage(const QString &message)
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{
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d->emptyExtenderMessage = message;
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if (d->emptyExtenderLabel) {
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d->emptyExtenderLabel->setText(message);
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}
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}
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QString Extender::emptyExtenderMessage() const
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{
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return d->emptyExtenderMessage;
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}
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QList<ExtenderItem*> Extender::items() const
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{
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QList<ExtenderItem*> result;
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//FIXME: a triple nested loop ... ew. there should be a more efficient way to do this
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//iterate through all extenders we can find and check each extenders source applet.
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foreach (Containment *c, d->applet->containment()->corona()->containments()) {
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foreach (Applet *applet, c->applets()) {
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if (applet->d->extender) {
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foreach (ExtenderItem *item, applet->d->extender->attachedItems()) {
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if (item->sourceAppletId() == d->applet->id()) {
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result.append(item);
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}
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}
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}
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}
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}
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return result;
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}
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QList<ExtenderItem*> Extender::attachedItems() const
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{
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return d->attachedExtenderItems;
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}
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QList<ExtenderItem*> Extender::detachedItems() const
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{
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QList<ExtenderItem*> result;
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foreach (ExtenderItem *item, items()) {
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if (item->isDetached()) {
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result.append(item);
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}
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}
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return result;
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}
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ExtenderItem *Extender::item(const QString &name) const
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{
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foreach (ExtenderItem *item, items()) {
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if (item->name() == name) {
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return item;
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}
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}
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return 0;
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}
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void Extender::saveState()
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{
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foreach (ExtenderItem *item, attachedItems()) {
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item->config().writeEntry("extenderItemPosition", item->geometry().y());
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}
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}
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QVariant Extender::itemChange(GraphicsItemChange change, const QVariant &value)
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{
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if (change == QGraphicsItem::ItemPositionHasChanged) {
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emit geometryChanged();
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}
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return QGraphicsWidget::itemChange(change, value);
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}
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void Extender::resizeEvent(QGraphicsSceneResizeEvent *event)
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{
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QGraphicsWidget::resizeEvent(event);
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emit geometryChanged();
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}
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void Extender::itemAddedEvent(ExtenderItem *item, const QPointF &pos)
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{
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//this is a sane size policy imo.
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item->setSizePolicy(QSizePolicy::MinimumExpanding, QSizePolicy::Fixed);
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if (pos == QPointF(-1, -1)) {
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d->layout->addItem(item);
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} else {
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d->layout->insertItem(d->insertIndexFromPos(pos), item);
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}
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//remove the empty extender message if needed.
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if (d->emptyExtenderLabel) {
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d->layout->removeItem(d->emptyExtenderLabel);
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d->emptyExtenderLabel->hide();
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}
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d->adjustSizeHints();
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}
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void Extender::itemRemovedEvent(ExtenderItem *item)
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{
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d->layout->removeItem(item);
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//add the empty extender message if needed.
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if (!attachedItems().count() && !d->spacerWidget) {
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d->emptyExtenderLabel->show();
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d->emptyExtenderLabel->setMinimumSize(item->size());
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//just in case:
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d->layout->removeItem(d->emptyExtenderLabel);
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d->layout->addItem(d->emptyExtenderLabel);
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}
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d->adjustSizeHints();
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}
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void Extender::itemHoverEnterEvent(ExtenderItem *item)
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{
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itemHoverMoveEvent(item, QPointF(0, 0));
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}
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void Extender::itemHoverMoveEvent(ExtenderItem *item, const QPointF &pos)
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{
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int insertIndex = d->insertIndexFromPos(pos);
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if (insertIndex == d->currentSpacerIndex) {
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//relayouting is resource intensive, so don't do that when not necesarry
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return;
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}
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//Make sure we remove any spacer that might allready be in the layout.
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itemHoverLeaveEvent(item);
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d->currentSpacerIndex = insertIndex;
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//Create a widget that functions as spacer, and add that to the layout.
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QGraphicsWidget *widget = new QGraphicsWidget(this);
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widget->setPreferredSize(QSizeF(item->size().width(), item->size().height()));
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widget->setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Fixed);
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d->spacerWidget = widget;
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d->layout->insertItem(insertIndex, widget);
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//Make sure we remove any 'no detachables' label that might be there, and update the layout.
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//XXX: duplicated from itemAttachedEvent.
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if (d->emptyExtenderLabel) {
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d->layout->removeItem(d->emptyExtenderLabel);
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d->emptyExtenderLabel->hide();
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}
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d->adjustSizeHints();
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}
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void Extender::itemHoverLeaveEvent(ExtenderItem *item)
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{
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Q_UNUSED(item);
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if (d->spacerWidget) {
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//Remove any trace of the spacer widget.
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d->layout->removeItem(d->spacerWidget);
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delete d->spacerWidget;
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d->spacerWidget = 0;
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d->currentSpacerIndex = -1;
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//Make sure we add a 'no detachables' label when the layout is empty.
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if (!attachedItems().count()) {
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d->emptyExtenderLabel->show();
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d->emptyExtenderLabel->setMinimumSize(item->size());
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d->layout->removeItem(d->emptyExtenderLabel);
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d->layout->addItem(d->emptyExtenderLabel);
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}
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d->adjustSizeHints();
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}
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}
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ExtenderPrivate::ExtenderPrivate(Applet *applet, Extender *extender) :
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q(extender),
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applet(applet),
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spacerWidget(0),
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emptyExtenderMessage(i18n("no items")),
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emptyExtenderLabel(0),
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popup(false)
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{
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}
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ExtenderPrivate::~ExtenderPrivate()
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{
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}
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void ExtenderPrivate::addExtenderItem(ExtenderItem *item, const QPointF &pos)
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{
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attachedExtenderItems.append(item);
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q->itemAddedEvent(item, pos);
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q->itemHoverLeaveEvent(item);
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emit q->itemAttached(item);
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}
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void ExtenderPrivate::removeExtenderItem(ExtenderItem *item)
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{
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attachedExtenderItems.removeOne(item);
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q->itemRemovedEvent(item);
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}
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void ExtenderPrivate::adjustSizeHints()
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{
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if (!q->layout()) {
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return;
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}
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q->layout()->updateGeometry();
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q->setMinimumSize(q->layout()->minimumSize());
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q->setPreferredSize(q->layout()->preferredSize());
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q->setMaximumSize(q->layout()->maximumSize());
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q->updateGeometry();
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}
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int ExtenderPrivate::insertIndexFromPos(const QPointF &pos) const
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{
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int insertIndex = -1;
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//XXX: duplicated from panel
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if (pos != QPointF(-1, -1)) {
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for (int i = 0; i < layout->count(); ++i) {
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QRectF siblingGeometry = layout->itemAt(i)->geometry();
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qreal middle = (siblingGeometry.top() + siblingGeometry.bottom()) / 2.0;
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if (pos.y() < middle) {
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insertIndex = i;
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break;
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} else if (pos.y() <= siblingGeometry.bottom()) {
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insertIndex = i + 1;
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break;
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}
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}
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}
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return insertIndex;
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}
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void ExtenderPrivate::loadExtenderItems()
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{
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KConfigGroup cg = applet->config("ExtenderItems");
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//first create a list of extenderItems, and then sort them on their position, so the items get
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//recreated in the correct order.
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//TODO: this restoring of the correct order should now be done in itemAddedEvent instead of
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//here, to allow easy subclassing of Extender.
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QList<QPair<int, QString> > groupList;
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foreach (const QString &extenderItemId, cg.groupList()) {
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KConfigGroup dg = cg.group(extenderItemId);
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groupList.append(qMakePair(dg.readEntry("extenderItemPosition", 0), extenderItemId));
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}
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qSort(groupList);
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//iterate over the extender items
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for (int i = 0; i < groupList.count(); i++) {
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QPair<int, QString> pair = groupList[i];
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KConfigGroup dg = cg.group(pair.second);
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//load the relevant settings.
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QString extenderItemId = dg.name();
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QString extenderItemName = dg.readEntry("extenderItemName", "");
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QString appletName = dg.readEntry("sourceAppletPluginName", "");
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uint sourceAppletId = dg.readEntry("sourceAppletId", 0);
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bool temporarySourceApplet = false;
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//find the source applet.
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Corona *corona = applet->containment()->corona();
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Applet *sourceApplet = 0;
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foreach (Containment *containment, corona->containments()) {
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foreach (Applet *applet, containment->applets()) {
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if (applet->id() == sourceAppletId) {
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sourceApplet = applet;
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}
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}
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}
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//There is no source applet. We just instantiate one just for the sake of creating
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//detachables.
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if (!sourceApplet) {
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kDebug() << "creating a temporary applet as factory";
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sourceApplet = Applet::load(appletName);
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temporarySourceApplet = true;
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//TODO: maybe add an option to applet to indicate that it shouldn't be deleted after
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//having used it as factory.
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}
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if (!sourceApplet) {
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kDebug() << "sourceApplet is null? appletName = " << appletName;
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kDebug() << " extenderItemId = " << extenderItemId;
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} else {
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ExtenderItem *item = new ExtenderItem(q, extenderItemId.toInt());
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item->setName(extenderItemName);
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sourceApplet->initExtenderItem(item);
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if (temporarySourceApplet) {
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delete sourceApplet;
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}
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}
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}
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adjustSizeHints();
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}
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} // Plasma namespace
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#include "extender.moc"
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