plasma-framework/widgets/widget.cpp
2008-03-18 01:39:28 +00:00

547 lines
13 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 as
* published by the Free Software Foundation; either version 2, or
* (at your option) any later version.
*
* 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 <QApplication>
#include <QGraphicsScene>
#include <QGraphicsSceneHoverEvent>
#include <QGraphicsView>
#include <QHelpEvent>
#include <QList>
#include <QPainter>
#include <QStyleOptionGraphicsItem>
#include <QDesktopWidget>
#include <KDebug>
#include "plasma/applet.h"
#include "layouts/freelayout.h"
#include "plasma/plasma.h"
#include "plasma/view.h"
#include "plasma/containment.h"
#include "plasma/widgets/tooltip_p.h"
namespace Plasma
{
class Widget::Private
{
public:
Private()
: minimumSize(0,0),
maximumSize(std::numeric_limits<qreal>::infinity(),
std::numeric_limits<qreal>::infinity()),
opacity(1.0),
wasMovable(false),
toolTip(0)
{ }
~Private()
{
delete toolTip;
}
QSizeF minimumSize;
QSizeF maximumSize;
qreal opacity;
bool wasMovable;
bool shouldPaint(QPainter *painter, const QTransform &transform);
ToolTipData *toolTip;
};
QGraphicsItem* Widget::graphicsItem()
{
return this;
}
QGraphicsView *Widget::view() const
{
// It's assumed that we won't be visible on more than one view here.
// Anything that actually needs view() should only really care about
// one of them anyway though.
if (!scene()) {
return 0;
}
foreach (QGraphicsView *view, scene()->views()) {
if (view->sceneRect().intersects(sceneBoundingRect()) ||
view->sceneRect().contains(scenePos())) {
return view;
}
}
return 0;
}
QRectF Widget::mapFromView(const QGraphicsView *view, const QRect &rect) const
{
// TODO: Confirm that adjusted() is needed and is not covering for some
// issue elsewhere
return mapFromScene(view->mapToScene(rect)).boundingRect().adjusted(0, 0, 1, 1);
}
QRect Widget::mapToView(const QGraphicsView *view, const QRectF &rect) const
{
// TODO: Confirm that adjusted() is needed and is not covering for some
// issue elsewhere
return view->mapFromScene(mapToScene(rect)).boundingRect().adjusted(0, 0, -1, -1);
}
bool Widget::Private::shouldPaint(QPainter *painter, const QTransform &transform)
{
Q_UNUSED(painter)
Q_UNUSED(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);
setCacheMode(DeviceCoordinateCache);
Widget *w = dynamic_cast<Widget *>(parent);
if (w) {
w->addChild(this);
}
}
Widget::~Widget()
{
if (ToolTip::self()->currentWidget() == this) {
ToolTip::self()->hide();
}
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)
{
setCacheMode(CacheMode(mode), size);
}
Widget::CachePaintMode Widget::cachePaintMode() const
{
return CachePaintMode(cacheMode());
}
void Widget::update(const QRectF &rect)
{
QGraphicsItem::update(rect);
}
Qt::Orientations Widget::expandingDirections() const
{
return Qt::Horizontal | Qt::Vertical;
}
void Widget::setMinimumSize(const QSizeF& newMin)
{
d->minimumSize = newMin;
QSizeF s = size();
if (s != s.expandedTo(newMin)) {
setGeometry(QRectF(pos(), s.expandedTo(newMin)));
}
}
QSizeF Widget::minimumSize() const
{
return d->minimumSize;
}
void Widget::setMaximumSize(const QSizeF& newMax)
{
d->maximumSize = newMax;
QSizeF s = size();
if (s != s.boundedTo(newMax)) {
setGeometry(QRectF(pos(), s.boundedTo(newMax)));
}
}
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(), size());
}
void Widget::setSize(const QSizeF &s)
{
LayoutItem::setSize(s);
}
void Widget::setGeometry(const QRectF& geometry)
{
setPos(geometry.topLeft());
if (geometry.size().width() > 0 && geometry.size().height() > 0 && 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());
setSize(QSizeF(width, height));
qreal xd = topLeft().x();
qreal yd = topLeft().y();
if (xd < 0) {
width -= xd;
xd = 0;
}
if (yd < 0) {
height -= yd;
yd = 0;
}
if (layout()) {
QRectF r(QPointF(xd, yd), QSizeF(width, height));
r = adjustToMargins(r);
layout()->setGeometry(r);
/*if (qobject_cast<Plasma::Applet*>(this)) {
kDebug() << (QObject*)this << this->geometry() << this->topLeft()
<< "layout geometry is now" << r << margin(RightMargin);
}*/
}
if (managingLayout()) {
//kDebug() << "invalidating managing layout";
managingLayout()->invalidate();
}
}
update();
}
void Widget::updateGeometry()
{
if (managingLayout()) {
managingLayout()->invalidate();
} else {
setGeometry(QRectF(pos(), sizeHint()));
}
}
QSizeF Widget::sizeHint() const
{
if (layout()) {
return layout()->sizeHint();
} else {
return size();
}
}
QFont Widget::font() const
{
return QApplication::font();
}
QRectF Widget::boundingRect() const
{
return QRectF(QPointF(0,0), 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 parent(this);
}
Widget *Widget::parent(const QGraphicsItem *item)
{
Q_ASSERT(item);
QGraphicsItem *parent = item->parentItem();
while (parent) {
Widget *parentWidget = dynamic_cast<Widget *>(parent);
if (parentWidget) {
return parentWidget;
}
parent = parent->parentItem();
}
return 0;
}
void Widget::addChild(Widget *w)
{
if (!w || QGraphicsItem::children().contains(w)) {
return;
}
w->setParentItem(this);
//kDebug() << "Added Child Widget" << (QObject*)w << "our geom is" << geometry();
if (layout()) {
layout()->addItem(w);
}
updateGeometry();
//kDebug() << "after the item is added our geom is now" << geometry();
}
void Widget::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
{
if (d->opacity < 1.0) {
painter->setOpacity(painter->opacity() * d->opacity);
}
/*
NOTE: put this back if we end up needing to control when things paint due to, e.g. zooming.
if (!d->shouldPaint(painter, transform())) {
return;
}
*/
paintWidget(painter, option, widget);
}
const ToolTipData* Widget::toolTip() const
{
return d->toolTip;
}
void Widget::setToolTip(const ToolTipData &tip)
{
if (tip.image.isNull() &&
tip.subText.isEmpty() &&
tip.mainText.isEmpty()) {
delete d->toolTip;
d->toolTip = 0;
return;
}
if (!d->toolTip) {
d->toolTip = new ToolTipData;
}
*d->toolTip = tip;
if (ToolTip::self()->currentWidget() == this) {
ToolTip::self()->show(this);
}
}
void Widget::updateToolTip()
{
}
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
}
QVariant Widget::itemChange(GraphicsItemChange change, const QVariant &value)
{
if (change == QGraphicsItem::ItemChildRemovedChange) {
if (layout() && !isAncestorOf(value.value<QGraphicsItem*>())) {
layout()->removeItem(dynamic_cast<Plasma::LayoutItem*>(value.value<QGraphicsItem*>()));
updateGeometry();
}
}
return QGraphicsItem::itemChange(change, value);
}
void Widget::managingLayoutChanged()
{
if (managingLayout()) {
d->wasMovable = flags() & ItemIsMovable;
if (!dynamic_cast<FreeLayout*>(managingLayout())) {
setFlag(ItemIsMovable, false);
}
} else {
setFlag(ItemIsMovable, d->wasMovable);
}
}
QPoint Widget::popupPosition(const QSize &s) const
{
QGraphicsView *v = view();
Q_ASSERT(v);
QPoint pos = v->mapFromScene(scenePos());
pos = v->mapToGlobal(pos);
kDebug() << "==> position is" << scenePos() << v->mapFromScene(scenePos()) << pos;
Plasma::View *pv = dynamic_cast<Plasma::View *>(v);
Plasma::Location loc = Floating;
if (pv) {
loc = pv->containment()->location();
}
switch (loc) {
case BottomEdge:
pos = QPoint(pos.x(), pos.y() - s.height());
break;
case TopEdge:
pos = QPoint(pos.x(), pos.y() + (int)size().height());
break;
case LeftEdge:
pos = QPoint(pos.x() + (int)size().width(), pos.y());
break;
case RightEdge:
pos = QPoint(pos.x() - s.width(), pos.y());
break;
default:
if (pos.y() - s.height() > 0) {
pos = QPoint(pos.x(), pos.y() - s.height());
} else {
pos = QPoint(pos.x(), pos.y() + (int)size().height());
}
}
//are we out of screen?
QRect screenRect = QApplication::desktop()->screenGeometry(pv ? pv->containment()->screen() : -1);
kDebug() << "==> rect for" << (pv ? pv->containment()->screen() : -1) << "is" << screenRect;
if (pos.rx() + s.width() > screenRect.right()) {
pos.rx() -= ((pos.rx() + s.width()) - screenRect.right());
}
if (pos.ry() + s.height() > screenRect.bottom()) {
pos.ry() -= ((pos.ry() + s.height()) - screenRect.bottom());
}
pos.rx() = qMax(0, pos.rx());
return pos;
}
void Widget::contextMenuEvent(QGraphicsSceneContextMenuEvent *event)
{
// HACK: QGraphicsItem's documentation says that the event will be passed
// to the parent if it's not handled, but it isn't passed. This can be
// removed when Qt4.4 becomes a requirement. See Qt bug #176902.
Widget *parentWidget = parent();
if (parentWidget) {
parentWidget->contextMenuEvent(event);
}
}
bool Widget::sceneEvent(QEvent *event)
{
switch (event->type()) {
case QEvent::GraphicsSceneHoverMove:
// If the tooltip isn't visible, run through showing the tooltip again
// so that it only becomes visible after a stationary hover
if (ToolTip::self()->isVisible()) {
break;
}
case QEvent::GraphicsSceneHoverEnter:
{
// Check that there is a tooltip to show
if (!d->toolTip) {
break;
}
// If the mouse is in the widget's area at the time that it is being
// created the widget can receive a hover event before it is fully
// initialized, in which case view() will return 0.
QGraphicsView *parentView = view();
if (parentView) {
ToolTip::self()->show(this);
}
break;
}
case QEvent::GraphicsSceneHoverLeave:
ToolTip::self()->delayedHide();
break;
case QEvent::GraphicsSceneMousePress:
case QEvent::GraphicsSceneWheel:
ToolTip::self()->hide();
default:
break;
}
return QGraphicsItem::sceneEvent(event);
}
} // Plasma namespace