plasma-framework/extenders/extendergroup.cpp

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/*
* Copyright 2009 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 "extendergroup.h"
#include <QAction>
#include <QApplication>
#include <QString>
#include <QList>
#include <QtGui/QGraphicsWidget>
#include <QtGui/QGraphicsLinearLayout>
#include <QtGui/QGraphicsSceneDragDropEvent>
#include "applet.h"
#include "extender.h"
#include "extenderitem.h"
#include "theme.h"
#include "widgets/scrollwidget.h"
#include "private/extender_p.h"
#include "private/extendergroup_p.h"
#include "private/extenderitemmimedata_p.h"
namespace Plasma
{
ExtenderGroup::ExtenderGroup(Extender *parent, uint groupId)
: ExtenderItem(parent, groupId),
d(new ExtenderGroupPrivate(this))
{
connect(extender(), SIGNAL(itemAttached(Plasma::ExtenderItem*)),
this, SLOT(addItemToGroup(Plasma::ExtenderItem*)));
connect(extender(), SIGNAL(itemDetached(Plasma::ExtenderItem*)),
this, SLOT(removeItemFromGroup(Plasma::ExtenderItem*)));
config().writeEntry("isGroup", true);
setAcceptDrops(true);
QGraphicsLinearLayout *lay = static_cast<QGraphicsLinearLayout *>(layout());
d->scrollWidget = new ScrollWidget(this);
d->scrollWidget->show();
lay->addItem(d->scrollWidget);
d->scrollWidget->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
d->childsWidget = new QGraphicsWidget(d->scrollWidget);
d->childsWidget->installEventFilter(this);
d->scrollWidget->setWidget(d->childsWidget);
d->layout = new QGraphicsLinearLayout(Qt::Vertical, d->childsWidget);
d->childsWidget->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Fixed);
d->scrollWidget->setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Preferred);
QAction *expand = new QAction(this);
expand->setVisible(true);
expand->setToolTip(i18n("Show this group."));
connect(expand, SIGNAL(triggered()), this, SLOT(expandGroup()));
addAction("expand", expand);
QAction *collapse = new QAction(this);
collapse->setVisible(false);
collapse->setToolTip(i18n("Hide this group."));
connect(collapse, SIGNAL(triggered()), this, SLOT(collapseGroup()));
addAction("collapse", collapse);
d->themeChanged();
QString groupName;
foreach (ExtenderItem *item, extender()->attachedItems()) {
groupName = item->config().readEntry("group", "");
if (!groupName.isEmpty() && groupName == name()) {
item->setGroup(this);
}
}
if (items().isEmpty() && d->autoHide && !isDetached()) {
extender()->itemRemovedEvent(this);
hide();
}
if (!config().readEntry("groupCollapsed", true)) {
expandGroup();
}
connect(Plasma::Theme::defaultTheme(), SIGNAL(themeChanged()),
this, SLOT(themeChanged()));
}
ExtenderGroup::~ExtenderGroup()
{
delete d;
}
QList<ExtenderItem*> ExtenderGroup::items() const
{
QList<ExtenderItem*> result;
foreach (ExtenderItem *item, extender()->attachedItems()) {
if (item->group() == this) {
result.append(item);
}
}
return result;
}
bool ExtenderGroup::autoHide() const
{
return d->autoHide;
}
void ExtenderGroup::setAutoHide(bool autoHide)
{
d->autoHide = autoHide;
if (autoHide && items().isEmpty()) {
extender()->itemRemovedEvent(this);
hide();
} else if (!autoHide && !isVisible()) {
extender()->itemAddedEvent(this);
show();
}
}
bool ExtenderGroup::isAutoCollapse() const
{
return d->autoCollapse;
}
void ExtenderGroup::setAutoCollapse(bool collapse)
{
d->autoCollapse = collapse;
if (collapse) {
setCollapsed(d->collapsed);
}
}
bool ExtenderGroup::isGroupCollapsed() const
{
return d->collapsed;
}
void ExtenderGroup::setGroupCollapsed(bool collapsed)
{
if (collapsed) {
collapseGroup();
} else {
expandGroup();
}
}
void ExtenderGroup::expandGroup()
{
if (d->autoCollapse) {
setCollapsed(false);
}
if (d->collapsed == false) {
return;
}
d->collapsed = false;
config().writeEntry("groupCollapsed", d->collapsed);
action("collapse")->setVisible(true);
action("expand")->setVisible(false);
foreach (ExtenderItem *item, extender()->attachedItems()) {
if (item->group() == this) {
item->show();
extender()->itemAddedEvent(item);
}
}
d->scrollWidget->show();
static_cast<QGraphicsLinearLayout *>(layout())->addItem(d->scrollWidget);
}
void ExtenderGroup::collapseGroup()
{
if (d->autoCollapse) {
setCollapsed(true);
}
if (d->collapsed == true) {
return;
}
d->collapsed = true;
config().writeEntry("groupCollapsed", d->collapsed);
action("collapse")->setVisible(false);
action("expand")->setVisible(true);
foreach (ExtenderItem *item, extender()->attachedItems()) {
if (item != this && item->group() == this) {
item->hide();
extender()->itemRemovedEvent(item);
}
}
d->scrollWidget->hide();
static_cast<QGraphicsLinearLayout *>(layout())->removeItem(d->scrollWidget);
}
void ExtenderGroup::resizeEvent(QGraphicsSceneResizeEvent *event)
{
ExtenderItem::resizeEvent(event);
}
bool ExtenderGroup::eventFilter(QObject *watched, QEvent *event)
{
if (watched == d->childsWidget && event->type() == QEvent::GraphicsSceneResize) {
//resize to the max between the extender size hint and ours (that's because the group can still not be in the extender layout)
extender()->resize(extender()->effectiveSizeHint(Qt::PreferredSize).expandedTo(effectiveSizeHint(Qt::PreferredSize)).width(), extender()->size().height());
}
return ExtenderItem::eventFilter(watched, event);
}
void ExtenderGroup::dragEnterEvent(QGraphicsSceneDragDropEvent *event)
{
if (event->mimeData()->hasFormat(ExtenderItemMimeData::mimeType())) {
event->accept();
dragMoveEvent(event);
}
}
void ExtenderGroup::dragMoveEvent(QGraphicsSceneDragDropEvent *event)
{
if (event->mimeData()->hasFormat(ExtenderItemMimeData::mimeType())) {
const ExtenderItemMimeData *mimeData =
qobject_cast<const ExtenderItemMimeData*>(event->mimeData());
if (mimeData) {
QPointF pos(event->pos());
if (d->spacerWidget && d->spacerWidget->geometry().contains(pos)) {
return;
}
//Make sure we remove any spacer that might already be in the layout.
if (d->spacerWidget) {
d->layout->removeItem(d->spacerWidget);
}
int insertIndex = d->insertIndexFromPos(pos);
//Create a widget that functions as spacer, and add that to the layout.
if (!d->spacerWidget) {
Spacer *widget = new Spacer(this);
ExtenderItem *item = mimeData->extenderItem();
qreal left, top, right, bottom;
extender()->d->background->getMargins(left, top, right, bottom);
widget->setMargins(left, 4, right, 4);
widget->setMinimumSize(item->minimumSize());
widget->setPreferredSize(item->preferredSize());
widget->setMaximumSize(item->maximumSize());
widget->setSizePolicy(item->sizePolicy());
d->spacerWidget = widget;
}
d->layout->insertItem(insertIndex, d->spacerWidget);
}
}
}
void ExtenderGroup::dropEvent(QGraphicsSceneDragDropEvent *event)
{
if (event->mimeData()->hasFormat(ExtenderItemMimeData::mimeType())) {
const ExtenderItemMimeData *mimeData =
qobject_cast<const ExtenderItemMimeData*>(event->mimeData());
if (mimeData) {
mimeData->extenderItem()->setGroup(this, event->pos());
QApplication::restoreOverrideCursor();
d->layout->removeItem(d->spacerWidget);
d->spacerWidget->deleteLater();
}
}
}
void ExtenderGroup::dragLeaveEvent(QGraphicsSceneDragDropEvent *event)
{
if (event->mimeData()->hasFormat(ExtenderItemMimeData::mimeType())) {
if (d->spacerWidget) {
d->layout->removeItem(d->spacerWidget);
}
}
}
ExtenderGroupPrivate::ExtenderGroupPrivate(ExtenderGroup *group)
: q(group),
spacerWidget(0),
svg(new Svg(group)),
collapsed(true),
autoHide(true),
autoCollapse(false)
{
}
ExtenderGroupPrivate::~ExtenderGroupPrivate()
{
}
void ExtenderGroupPrivate::addItemToGroup(Plasma::ExtenderItem *item, const QPointF &pos)
{
if (item->group() == q) {
item->setParentItem(childsWidget);
item->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Fixed);
layout->insertItem(insertIndexFromPos(pos), item);
layout->activate();
childsWidget->resize(childsWidget->size().width(),
childsWidget->effectiveSizeHint(Qt::PreferredSize).height());
if (!q->isVisible() && !q->items().isEmpty()) {
q->extender()->itemAddedEvent(q);
q->show();
}
scrollWidget->setVisible(!q->isCollapsed());
q->extender()->resize(q->extender()->effectiveSizeHint(Qt::PreferredSize));
}
}
void ExtenderGroupPrivate::removeItemFromGroup(Plasma::ExtenderItem *item)
{
if (item->group() == q) {
if (q->items().isEmpty() && autoHide && !q->isDetached()) {
q->extender()->itemRemovedEvent(q);
q->hide();
}
childsWidget->resize(childsWidget->size().width(),
childsWidget->effectiveSizeHint(Qt::PreferredSize).height());
layout->removeItem(item);
item->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Preferred);
q->extender()->resize(q->extender()->effectiveSizeHint(Qt::PreferredSize));
}
}
void ExtenderGroupPrivate::themeChanged()
{
svg->setImagePath("widgets/configuration-icons");
svg->resize();
q->action("expand")->setIcon(QIcon(svg->pixmap("restore")));
q->action("collapse")->setIcon(QIcon(svg->pixmap("collapse")));
}
int ExtenderGroupPrivate::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;
}
} // Plasma namespace
#include "extendergroup.moc"