plasma-framework/widgets/widget.cpp
Andreas Aardal Hanssen 55e02ca70a Add CachePaintMode, as a temporary local back-port of
QGraphicsItem::CacheMode, which will appear in 4.4. I've chosen names
that aren't really good, but they're not misleading, and they don't
clash with the API in 4.4.

My first KDE submit :-DDD.


svn path=/trunk/KDE/kdebase/workspace/libs/plasma/; revision=710738
2007-09-10 19:06:58 +00:00

398 lines
9.3 KiB
C++

/*
* Copyright 2007 by Alexander Wiedenbruch <mail@wiedenbruch.de>
* and Matias Valdenegro <mvaldenegro@informatica.utem.cl>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Library General Public License version 2 as
* published by the Free Software Foundation
*
* This program 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 General Public License for more details
*
* You should have received a copy of the GNU Library General Public
* License along with this program; if not, write to the
* Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include "widget.h"
#include <cmath>
#include <limits>
#include <QtCore/QList>
#include <QPainter>
#include <QPixmapCache>
#include <QStyleOptionGraphicsItem>
#include <KDebug>
#include "layout.h"
#include "plasma/plasma.h"
namespace Plasma
{
class Widget::Private
{
public:
Private()
: minimumSize(0,0)
, maximumSize(std::numeric_limits<qreal>::infinity(),
std::numeric_limits<qreal>::infinity())
, parent(0)
, opacity(1.0)
, cachePaintMode(Widget::NoCacheMode)
{ }
~Private() { }
QSizeF size;
QSizeF minimumSize;
QSizeF maximumSize;
Widget *parent;
QList<Widget *> childList;
qreal opacity;
// Replace with CacheMode in 4.4
#if QT_VERSION >= 0x040400
#warning Replace Plasma::Widget::CachePaintMode with QGraphicsItem::CacheMode
#endif
Widget::CachePaintMode cachePaintMode;
QSize cacheSize;
QString cacheKey;
QRectF cacheInvalidated;
bool shouldPaint(QPainter *painter, const QTransform &transform);
};
QGraphicsItem* Widget::graphicsItem()
{
return this;
}
bool Widget::Private::shouldPaint(QPainter *painter, const QTransform &transform)
{
qreal zoomLevel = painter->transform().m11() / transform.m11();
//return (fabs(zoomLevel - scalingFactor(Plasma::DesktopZoom))) < std::numeric_limits<double>::epsilon();
return true;
}
Widget::Widget(QGraphicsItem *parent,QObject* parentObject)
: QObject(parentObject),
QGraphicsItem(parent),
d(new Private)
{
setFlag(QGraphicsItem::ItemClipsToShape, true);
setFlag(QGraphicsItem::ItemClipsChildrenToShape, true);
d->parent = dynamic_cast<Widget *>(parent);
if (d->parent) {
d->parent->addChild(this);
d->parent->updateGeometry();
}
}
Widget::~Widget()
{
delete d;
}
void Widget::setOpacity(qreal opacity)
{
d->opacity = opacity;
}
qreal Widget::opacity() const
{
return d->opacity;
}
void Widget::setCachePaintMode(CachePaintMode mode, const QSize &size)
{
d->cachePaintMode = mode;
d->cacheSize = size;
if (mode == NoCacheMode) {
QPixmapCache::remove(d->cacheKey);
d->cacheKey.clear();
update();
} else {
if (mode == ItemCoordinateCacheMode) {
d->cacheKey = QString("%1").arg(long(this));
d->cacheSize = size;
}
invalidate();
}
}
Widget::CachePaintMode Widget::cachePaintMode() const
{
return d->cachePaintMode;
}
void Widget::invalidate(const QRectF &rect)
{
if (d->cachePaintMode != NoCacheMode)
d->cacheInvalidated |= rect.isNull() ? boundingRect() : rect;
update(rect);
}
Qt::Orientations Widget::expandingDirections() const
{
return Qt::Horizontal | Qt::Vertical;
}
void Widget::setMinimumSize(const QSizeF& size)
{
d->minimumSize = size;
}
QSizeF Widget::minimumSize() const
{
return d->minimumSize;
}
void Widget::setMaximumSize(const QSizeF& size)
{
d->maximumSize = size;
}
QSizeF Widget::maximumSize() const
{
return d->maximumSize;
}
bool Widget::hasHeightForWidth() const
{
return false;
}
qreal Widget::heightForWidth(qreal w) const
{
Q_UNUSED(w);
return -1.0;
}
bool Widget::hasWidthForHeight() const
{
return false;
}
qreal Widget::widthForHeight(qreal h) const
{
Q_UNUSED(h);
return -1.0;
}
QRectF Widget::geometry() const
{
return QRectF(pos(),d->size);
}
#if 0
QRectF Widget::localGeometry() const
{
return QRectF(QPointF(0.0f, 0.0f), boundingRect().size);
}
#endif
void Widget::setGeometry(const QRectF& geometry)
{
if ( d->size != geometry.size() ) {
prepareGeometryChange();
qreal width = qBound(d->minimumSize.width(), geometry.size().width(), d->maximumSize.width());
qreal height = qBound(d->minimumSize.height(), geometry.size().height(), d->maximumSize.height());
d->size = QSizeF(width, height);
if ( layout() )
layout()->setGeometry(boundingRect());
}
setPos(geometry.topLeft() - boundingRect().topLeft());
update();
}
void Widget::updateGeometry()
{
if ( managingLayout() ) {
managingLayout()->invalidate();
}
}
QSizeF Widget::sizeHint() const
{
if (layout()) {
return layout()->sizeHint();
} else {
return QSizeF();
}
}
QSizeF Widget::size() const
{
return geometry().size();
}
QRectF Widget::boundingRect() const
{
return QRectF(QPointF(0,0),geometry().size());
}
void Widget::resize(const QSizeF& size)
{
setGeometry(QRectF(pos(), size));
}
void Widget::resize(qreal w, qreal h)
{
resize(QSizeF(w, h));
}
Widget *Widget::parent() const
{
return d->parent;
}
void Widget::addChild(Widget *w)
{
if (!w) {
return;
}
w->reparent(this);
d->childList.append(w);
qDebug("Added Child Widget : %p", (void*)w);
if (layout()) {
layout()->addItem(w);
updateGeometry();
}
}
void Widget::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
{
painter->setOpacity(d->opacity);
if (d->shouldPaint(painter, transform())) {
if (d->cachePaintMode == NoCacheMode) {
paintWidget(painter, option, widget);
} else {
QRectF brect = boundingRect();
QRect boundingRectInt = brect.toRect();
// Fetch the off-screen transparent buffer and exposed area info.
QPixmap pix;
QPixmapCache::find(d->cacheKey, pix);
QRectF exposed = d->cacheInvalidated;
// Render using item coodinate cache mode.
if (d->cachePaintMode == ItemCoordinateCacheMode) {
// Recreate the pixmap if it's gone.
if (pix.isNull()) {
pix = QPixmap(d->cacheSize);
pix.fill(Qt::transparent);
exposed = brect;
}
// Check for newly invalidated areas.
if (!exposed.isNull()) {
d->cacheInvalidated = QRectF();
QStyleOptionGraphicsItem cacheOption = *option;
cacheOption.exposedRect = exposed.toRect(); // <- truncation
QPainter pixmapPainter(&pix);
// Fit the item's bounding rect into the pixmap's coordinates.
pixmapPainter.scale(pix.width() / brect.width(),
pix.height() / brect.height());
pixmapPainter.translate(-brect.topLeft());
// Re-render the invalidated areas of the pixmap. Important: don't
// fool the item into using the widget - pass 0 instead of \a
// widget.
paintWidget(&pixmapPainter, &cacheOption, 0);
pixmapPainter.end();
// Reinsert this pixmap into the cache
QPixmapCache::insert(d->cacheKey, pix);
}
// Redraw the exposed area using the transformed painter. Depending on
// the hardware, this may be a server-side operation, or an expensive
// qpixmap-image-transform-pixmap roundtrip.
painter->drawPixmap(brect, pix, QRectF(QPointF(), pix.size()));
return;
}
// Render using device coordinate cache mode.
if (d->cachePaintMode == DeviceCoordinateCacheMode) {
QTransform transform = painter->worldTransform();
QRect deviceRect = transform.mapRect(brect).toRect();
// Auto-adjust the pixmap size.
if (deviceRect.size() != pix.size()) {
pix = QPixmap(deviceRect.size());
pix.fill(Qt::transparent);
exposed = brect;
}
// Check for newly invalidated areas.
if (!exposed.isNull()) {
d->cacheInvalidated = QRectF();
// Construct the new styleoption, reset the exposed rect.
QStyleOptionGraphicsItem cacheOption = *option;
cacheOption.exposedRect = exposed.toRect(); // <- truncation
QPointF viewOrigo = transform.map(QPointF(0, 0));
QPointF offset = viewOrigo - deviceRect.topLeft();
// Transform the painter, and render the item in device coordinates.
QPainter pixmapPainter(&pix);
pixmapPainter.translate(offset);
pixmapPainter.setWorldTransform(transform, true);
pixmapPainter.translate(transform.inverted().map(QPointF(0, 0)));
paintWidget(&pixmapPainter, &cacheOption, 0);
pixmapPainter.end();
// Reinsert this pixmap into the cache
QPixmapCache::insert(d->cacheKey, pix);
}
// Redraw the exposed area using an untransformed painter. This
// effectively becomes a bitblit that does not transform the cache.
painter->setWorldTransform(QTransform());
painter->drawPixmap(deviceRect.topLeft(), pix);
return;
}
}
}
return;
}
void Widget::paintWidget(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
{
Q_UNUSED(painter);
Q_UNUSED(option);
Q_UNUSED(widget);
// Replaced by widget's own function
}
void Widget::reparent(Widget *w)
{
d->parent = w;
setParentItem(w);
update();
}
} // Plasma namespace