468 lines
12 KiB
C++
468 lines
12 KiB
C++
/*
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* Copyright 2007 by Alexander Wiedenbruch <mail@wiedenbruch.de>
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* and Matias Valdenegro <mvaldenegro@informatica.utem.cl>
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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 Library General Public License as
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* published by the Free Software Foundation; either version 2, 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 Library General Public
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* License 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 "widget.h"
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#include <cmath>
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#include <limits>
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#include <QApplication>
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#include <QList>
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#include <QPainter>
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#include <QPixmapCache>
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#include <QStyleOptionGraphicsItem>
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#include <QGraphicsSceneContextMenuEvent>
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#include <KDebug>
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#include "freelayout.h"
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#include "plasma/plasma.h"
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namespace Plasma
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{
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class Widget::Private
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{
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public:
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Private()
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: minimumSize(0,0),
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maximumSize(std::numeric_limits<qreal>::infinity(),
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std::numeric_limits<qreal>::infinity()),
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opacity(1.0),
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cachePaintMode(Widget::NoCacheMode),
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wasMovable(false)
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{ }
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~Private() { }
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QSizeF size;
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QSizeF minimumSize;
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QSizeF maximumSize;
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QList<Widget *> childList;
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qreal opacity;
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// Replace with CacheMode in 4.4
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#if QT_VERSION >= 0x040400
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#warning Replace Plasma::Widget::CachePaintMode with QGraphicsItem::CacheMode
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#endif
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Widget::CachePaintMode cachePaintMode;
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QSize cacheSize;
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QString cacheKey;
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QRectF cacheInvalidated;
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bool wasMovable;
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bool shouldPaint(QPainter *painter, const QTransform &transform);
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};
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QGraphicsItem* Widget::graphicsItem()
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{
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return this;
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}
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bool Widget::Private::shouldPaint(QPainter *painter, const QTransform &transform)
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{
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Q_UNUSED(painter)
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Q_UNUSED(transform)
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//qreal zoomLevel = painter->transform().m11() / transform.m11();
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//return (fabs(zoomLevel - scalingFactor(Plasma::DesktopZoom))) < std::numeric_limits<double>::epsilon();
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return true;
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}
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Widget::Widget(QGraphicsItem *parent, QObject* parentObject)
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: QObject(parentObject),
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QGraphicsItem(parent),
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d(new Private)
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{
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setFlag(QGraphicsItem::ItemClipsToShape, true);
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setFlag(QGraphicsItem::ItemClipsChildrenToShape, true);
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setCachePaintMode(DeviceCoordinateCacheMode);
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Widget *w = dynamic_cast<Widget *>(parent);
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if (w) {
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w->addChild(this);
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}
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}
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Widget::~Widget()
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{
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delete d;
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}
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void Widget::setOpacity(qreal opacity)
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{
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d->opacity = opacity;
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}
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qreal Widget::opacity() const
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{
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return d->opacity;
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}
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void Widget::setCachePaintMode(CachePaintMode mode, const QSize &size)
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{
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d->cachePaintMode = mode;
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if (mode == NoCacheMode) {
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QPixmapCache::remove(d->cacheKey);
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d->cacheKey.clear();
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} else {
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d->cacheKey = QString("%1").arg(long(this));
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if (mode == ItemCoordinateCacheMode) {
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d->cacheSize = size.isNull() ? boundingRect().size().toSize() : size;
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}
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}
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}
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Widget::CachePaintMode Widget::cachePaintMode() const
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{
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return d->cachePaintMode;
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}
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void Widget::update(const QRectF &rect)
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{
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if (d->cachePaintMode != NoCacheMode) {
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d->cacheInvalidated |= rect.isNull() ? boundingRect() : rect;
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}
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QGraphicsItem::update(rect);
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}
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Qt::Orientations Widget::expandingDirections() const
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{
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return Qt::Horizontal | Qt::Vertical;
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}
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void Widget::setMinimumSize(const QSizeF& size)
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{
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d->minimumSize = size;
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}
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QSizeF Widget::minimumSize() const
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{
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return d->minimumSize;
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}
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void Widget::setMaximumSize(const QSizeF& size)
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{
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d->maximumSize = size;
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}
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QSizeF Widget::maximumSize() const
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{
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return d->maximumSize;
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}
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bool Widget::hasHeightForWidth() const
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{
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return false;
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}
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qreal Widget::heightForWidth(qreal w) const
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{
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Q_UNUSED(w);
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return -1.0;
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}
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bool Widget::hasWidthForHeight() const
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{
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return false;
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}
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qreal Widget::widthForHeight(qreal h) const
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{
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Q_UNUSED(h);
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return -1.0;
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}
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QRectF Widget::geometry() const
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{
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return QRectF(pos(), d->size);
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}
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#if 0
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QRectF Widget::localGeometry() const
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{
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return QRectF(QPointF(0.0f, 0.0f), boundingRect().size);
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}
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#endif
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void Widget::setGeometry(const QRectF& geometry)
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{
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if (geometry.size().width() > 0 && geometry.size().height() > 0 && d->size != geometry.size()) {
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prepareGeometryChange();
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qreal width = qBound(d->minimumSize.width(), geometry.size().width(), d->maximumSize.width());
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qreal height = qBound(d->minimumSize.height(), geometry.size().height(), d->maximumSize.height());
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d->size = QSizeF(width, height);
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if (layout()) {
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layout()->setGeometry(boundingRect());
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}
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}
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setPos(geometry.topLeft());
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update();
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}
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void Widget::setSize(const QSizeF& size)
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{
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d->size = size;
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}
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void Widget::updateGeometry()
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{
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if (managingLayout()) {
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managingLayout()->invalidate();
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} else {
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setGeometry(QRectF(pos(), sizeHint()));
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}
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}
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QSizeF Widget::sizeHint() const
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{
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if (layout()) {
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return layout()->sizeHint();
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} else {
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return boundingRect().size();
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}
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}
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QSizeF Widget::size() const
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{
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return geometry().size();
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}
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QFont Widget::font() const
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{
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return QApplication::font();
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}
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/*
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void Widget::setFont(const QFront& font)
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{
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}
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*/
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QRectF Widget::boundingRect() const
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{
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return QRectF(QPointF(0,0), d->size);
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}
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void Widget::resize(const QSizeF& size)
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{
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setGeometry(QRectF(pos(), size));
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}
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void Widget::resize(qreal w, qreal h)
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{
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resize(QSizeF(w, h));
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}
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Widget *Widget::parent() const
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{
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return dynamic_cast<Widget *>(parentItem());
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}
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void Widget::addChild(Widget *w)
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{
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if (!w || d->childList.contains(w)) {
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return;
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}
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d->childList.append(w);
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w->setParentItem(this);
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//kDebug() << "Added Child Widget" << w;
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if (layout()) {
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layout()->addItem(w);
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}
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updateGeometry();
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//TODO: is this necessary?
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w->update();
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}
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void Widget::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
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{
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painter->setOpacity(d->opacity);
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/*
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NOTE: put this back if we end up needing to control when things paint due to, e.g. zooming.
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if (!d->shouldPaint(painter, transform())) {
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return;
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}
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*/
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if (d->cachePaintMode == NoCacheMode) {
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paintWidget(painter, option, widget);
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return;
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}
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// Cached painting
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QRectF brect = boundingRect();
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// Fetch the off-screen transparent buffer and exposed area info.
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QPixmap pix;
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QPixmapCache::find(d->cacheKey, pix);
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QRectF exposed = d->cacheInvalidated;
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// Render using item coodinate cache mode.
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if (d->cachePaintMode == ItemCoordinateCacheMode) {
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// Recreate the pixmap if it's gone.
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if (pix.isNull()) {
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pix = QPixmap(d->cacheSize);
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pix.fill(Qt::transparent);
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exposed = brect;
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}
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// Check for newly invalidated areas.
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if (!exposed.isNull()) {
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d->cacheInvalidated = QRectF();
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QStyleOptionGraphicsItem cacheOption = *option;
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cacheOption.exposedRect = exposed.toRect(); // <- truncation
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QPainter pixmapPainter(&pix);
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// Fit the item's bounding rect into the pixmap's coordinates.
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pixmapPainter.scale(pix.width() / brect.width(),
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pix.height() / brect.height());
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pixmapPainter.translate(-brect.topLeft());
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// erase the exposed area so we don't paint over and over
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pixmapPainter.setCompositionMode(QPainter::CompositionMode_Source);
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pixmapPainter.fillRect(exposed, Qt::transparent);
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pixmapPainter.setCompositionMode(QPainter::CompositionMode_SourceOver);
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// Re-render the invalidated areas of the pixmap. Important: don't
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// fool the item into using the widget - pass 0 instead of \a
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// widget.
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paintWidget(&pixmapPainter, &cacheOption, 0);
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pixmapPainter.end();
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// Reinsert this pixmap into the cache
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QPixmapCache::insert(d->cacheKey, pix);
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}
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// Redraw the exposed area using the transformed painter. Depending on
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// the hardware, this may be a server-side operation, or an expensive
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// qpixmap-image-transform-pixmap roundtrip.
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painter->drawPixmap(brect, pix, QRectF(QPointF(), pix.size()));
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return;
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}
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// Render using device coordinate cache mode.
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if (d->cachePaintMode == DeviceCoordinateCacheMode) {
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QTransform transform = painter->worldTransform();
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QRect deviceRect = transform.mapRect(brect).toRect();
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if (deviceRect.width() < 1 ||
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deviceRect.height() < 1) {
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// we have nothing to paint!
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return;
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}
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// Auto-adjust the pixmap size.
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if (deviceRect.size() != pix.size()) {
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pix = QPixmap(deviceRect.size());
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pix.fill(Qt::transparent);
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exposed = brect;
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}
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// Check for newly invalidated areas.
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if (!exposed.isNull()) {
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d->cacheInvalidated = QRectF();
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// Construct the new styleoption, reset the exposed rect.
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QStyleOptionGraphicsItem cacheOption = *option;
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cacheOption.exposedRect = exposed.toRect(); // <- truncation
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QPointF viewOrigo = transform.map(QPointF(0, 0));
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QPointF offset = viewOrigo - deviceRect.topLeft();
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// Transform the painter, and render the item in device coordinates.
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QPainter pixmapPainter(&pix);
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pixmapPainter.translate(offset);
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pixmapPainter.setWorldTransform(transform, true);
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pixmapPainter.translate(transform.inverted().map(QPointF(0, 0)));
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// erase the exposed area so we don't paint over and over
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pixmapPainter.setCompositionMode(QPainter::CompositionMode_Source);
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pixmapPainter.fillRect(exposed, Qt::transparent);
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pixmapPainter.setCompositionMode(QPainter::CompositionMode_SourceOver);
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paintWidget(&pixmapPainter, &cacheOption, 0);
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pixmapPainter.end();
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// Reinsert this pixmap into the cache
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QPixmapCache::insert(d->cacheKey, pix);
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}
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// Redraw the exposed area using an untransformed painter. This
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// effectively becomes a bitblit that does not transform the cache.
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painter->setWorldTransform(QTransform());
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painter->drawPixmap(deviceRect.topLeft(), pix);
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return;
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}
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}
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void Widget::paintWidget(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
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{
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Q_UNUSED(painter);
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Q_UNUSED(option);
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Q_UNUSED(widget);
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// Replaced by widget's own function
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}
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QVariant Widget::itemChange(GraphicsItemChange change, const QVariant &value)
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{
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if (change == QGraphicsItem::ItemChildRemovedChange) {
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Widget *child = dynamic_cast<Plasma::Widget*>(value.value<QGraphicsItem*>());
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if (child) {
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d->childList.removeAll(child);
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updateGeometry();
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}
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}
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return QGraphicsItem::itemChange(change, value);
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}
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void Widget::managingLayoutChanged()
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{
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if (managingLayout()) {
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d->wasMovable = flags() & ItemIsMovable;
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if (!dynamic_cast<FreeLayout*>(managingLayout())) {
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setFlag(ItemIsMovable, false);
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}
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} else {
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setFlag(ItemIsMovable, d->wasMovable);
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}
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}
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} // Plasma namespace
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