307 lines
9.0 KiB
C++
307 lines
9.0 KiB
C++
/***************************************************************************
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* Copyright 2009 by Alessandro Diaferia <alediaferia@gmail.com> *
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* Copyright 2009 by Marco Martin <notmart@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 "itembackground.h"
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#include <QPainter>
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#include <QTimer>
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#include <QStyleOptionGraphicsItem>
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#include <kdebug.h>
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#include <plasma/framesvg.h>
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#include <plasma/animator.h>
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#include <plasma/theme.h>
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namespace Plasma
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{
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class ItemBackgroundPrivate
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{
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public:
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ItemBackgroundPrivate(ItemBackground *parent)
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: q(parent),
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target(0)
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{}
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void animationUpdate(qreal progress);
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void targetDestroyed(QObject*);
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void frameSvgChanged();
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void refreshCurrentTarget();
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ItemBackground * const q;
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QGraphicsItem *target;
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Plasma::FrameSvg *frameSvg;
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QRectF oldGeometry;
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QRectF newGeometry;
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int animId;
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qreal opacity;
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bool fading;
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bool fadeIn;
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bool immediate;
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};
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ItemBackground::ItemBackground(QGraphicsWidget *parent)
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: QGraphicsWidget(parent),
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d(new ItemBackgroundPrivate(this))
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{
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setCacheMode(DeviceCoordinateCache);
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setFlag(ItemIsMovable, false);
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setFlag(ItemIsSelectable, false);
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setFlag(ItemIsFocusable, false);
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d->frameSvg = new Plasma::FrameSvg(this);
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d->animId = 0;
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d->opacity = 1;
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d->fading = false;
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d->fadeIn = false;
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d->immediate = false;
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d->frameSvg->setImagePath("widgets/viewitem");
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d->frameSvg->setEnabledBorders(Plasma::FrameSvg::AllBorders);
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d->frameSvg->setCacheAllRenderedFrames(true);
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d->frameSvg->setElementPrefix("hover");
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qreal l, t, r, b;
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d->frameSvg->getMargins(l, t, r, b);
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setContentsMargins(l, t, r, b);
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connect(d->frameSvg, SIGNAL(repaintNeeded()), this, SLOT(frameSvgChanged()));
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setAcceptedMouseButtons(0);
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setZValue(-800);
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/***************
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* HACK: this is needed in order to show the itemBackground correctly the first time
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* it appears to be a workaround for some other qt 4.5 clipping bug
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* will be removed when trunk depends on 4.6
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*/
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resize( 1, 1 );
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hide();
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//**************
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}
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ItemBackground::~ItemBackground()
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{
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delete d;
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}
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void ItemBackground::setTarget(const QRectF &newGeometry)
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{
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d->oldGeometry = geometry();
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d->newGeometry = newGeometry;
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if (!isVisible() && (!d->target || !d->target->isVisible())) {
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setGeometry(d->newGeometry);
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return;
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}
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QGraphicsWidget *pw = parentWidget();
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if (pw) {
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d->newGeometry = d->newGeometry.intersected(QRectF(QPointF(0,0), pw->size()));
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}
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if (d->animId != 0) {
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Plasma::Animator::self()->stopCustomAnimation(d->animId);
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}
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if (d->target && d->target->isVisible() && !isVisible()) {
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setGeometry(newGeometry);
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d->oldGeometry = newGeometry;
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show();
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} else {
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d->fading = false;
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d->opacity = 1;
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d->animId = Plasma::Animator::self()->customAnimation(
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15, 250, Plasma::Animator::EaseInOutCurve, this, "animationUpdate");
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}
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}
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void ItemBackground::setTargetItem(QGraphicsItem *target)
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{
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if (d->target && d->target != target) {
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QObject *obj = 0;
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if (d->target->isWidget()) {
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obj = static_cast<QGraphicsWidget*>(d->target);
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obj->removeEventFilter(this);
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} else {
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d->target->removeSceneEventFilter(this);
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obj = dynamic_cast<QObject *>(d->target);
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}
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if (obj) {
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disconnect(obj, 0, this, 0);
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}
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}
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bool newTarget = (d->target != target);
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d->target = target;
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if (target) {
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setZValue(target->zValue() - 1);
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setParentItem(target->parentItem());
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QRectF rect = target->boundingRect();
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rect.moveTopLeft(target->pos());
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setTarget(rect);
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if (newTarget) {
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QObject *obj = 0;
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if (target->isWidget()) {
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obj = static_cast<QGraphicsWidget*>(target);
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obj->installEventFilter(this);
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} else {
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d->target->installSceneEventFilter(this);
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obj = dynamic_cast<QObject *>(target);
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}
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if (obj) {
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connect(obj, SIGNAL(destroyed(QObject*)), this, SLOT(targetDestroyed(QObject*)));
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}
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}
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} else {
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hide();
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}
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}
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bool ItemBackground::eventFilter(QObject *watched, QEvent *event)
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{
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QGraphicsWidget *targetWidget = static_cast<QGraphicsWidget *>(d->target);
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if (watched == targetWidget) {
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if (event->type() == QEvent::GraphicsSceneResize ||
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event->type() == QEvent::GraphicsSceneMove) {
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// We need to wait for the parent widget to resize...
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QTimer::singleShot(0, this, SLOT(refreshCurrentTarget()) );
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}
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}
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return false;
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}
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bool ItemBackground::sceneEventFilter(QGraphicsItem *watched, QEvent *event)
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{
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if (watched == d->target) {
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if (event->type() == QEvent::GraphicsSceneMove) {
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QTimer::singleShot(0, this, SLOT(refreshCurrentTarget()) );
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}
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}
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return false;
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}
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void ItemBackground::resizeEvent(QGraphicsSceneResizeEvent *)
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{
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d->frameSvg->resizeFrame(size());
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}
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QVariant ItemBackground::itemChange(GraphicsItemChange change, const QVariant &value)
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{
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if (d->immediate) {
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return value;
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}
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if (change == ItemVisibleChange) {
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bool visible = value.toBool();
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bool retVisible = visible;
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if (visible == isVisible() || d->animId == 0) {
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retVisible = true;
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}
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d->fading = true;
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d->fadeIn = visible;
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if (d->animId != 0) {
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Plasma::Animator::self()->stopCustomAnimation(d->animId);
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}
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d->animId = Plasma::Animator::self()->customAnimation(
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10, 250, Plasma::Animator::EaseInCurve, this, "animationUpdate");
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return retVisible;
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}
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return value;
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}
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void ItemBackground::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
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{
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Q_UNUSED(widget)
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if (qFuzzyCompare(d->opacity, (qreal)1.0)) {
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d->frameSvg->paintFrame(painter, option->rect.topLeft());
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} else if (qFuzzyCompare(d->opacity+1, (qreal)1.0)) {
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return;
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} else {
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QPixmap framePix = d->frameSvg->framePixmap();
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QPainter bufferPainter(&framePix);
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bufferPainter.setCompositionMode(QPainter::CompositionMode_DestinationIn);
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bufferPainter.fillRect(framePix.rect(), QColor(0, 0, 0, 255 * d->opacity));
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bufferPainter.end();
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painter->drawPixmap(framePix.rect(), framePix, framePix.rect());
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}
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}
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void ItemBackgroundPrivate::animationUpdate(qreal progress)
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{
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if (progress == 1) {
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animId = 0;
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if ((!fading) || (fadeIn)) {
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emit q->targetReached(target);
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}
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}
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if (fading) {
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opacity = fadeIn?progress:1-progress;
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if (!fadeIn && qFuzzyCompare(opacity+1, (qreal)1.0)) {
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immediate = true;
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q->hide();
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immediate = false;
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}
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} else if (oldGeometry != newGeometry) {
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q->setGeometry(oldGeometry.x() + (newGeometry.x() - oldGeometry.x()) * progress,
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oldGeometry.y() + (newGeometry.y() - oldGeometry.y()) * progress,
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oldGeometry.width() + (newGeometry.width() - oldGeometry.width()) * progress,
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oldGeometry.height() + (newGeometry.height() - oldGeometry.height()) * progress);
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}
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q->update();
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emit q->animationStep(progress);
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}
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void ItemBackgroundPrivate::targetDestroyed(QObject*)
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{
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target = 0;
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q->setTargetItem(0);
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}
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void ItemBackgroundPrivate::frameSvgChanged()
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{
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qreal l, t, r, b;
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frameSvg->getMargins(l, t, r, b);
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q->setContentsMargins(l, t, r, b);
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q->update();
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emit q->appearanceChanged();
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}
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void ItemBackgroundPrivate::refreshCurrentTarget()
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{
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q->setTargetItem(target);
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}
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} // Plasma namespace
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#include "itembackground.moc"
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