plasma-framework/widgets/scrollwidget.cpp

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/*
* Copyright 2009 Marco Martin <notmart@gmail.com>
*
* 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 "scrollwidget.h"
//Qt
#include <QGraphicsSceneResizeEvent>
#include <QGraphicsGridLayout>
#include <QGraphicsScene>
#include <QApplication>
#include <QWidget>
#include <QTimer>
//KDE
#include <kmimetype.h>
#include <kdebug.h>
#include <kglobalsettings.h>
//Plasma
#include <plasma/widgets/scrollbar.h>
#include <plasma/widgets/svgwidget.h>
#include <plasma/animator.h>
#include <plasma/svg.h>
namespace Plasma
{
class ScrollWidgetPrivate
{
public:
ScrollWidgetPrivate(ScrollWidget *parent)
: q(parent),
widget(0),
topBorder(0),
bottomBorder(0),
leftBorder(0),
rightBorder(0),
dragging(false),
animId(0)
{
}
~ScrollWidgetPrivate()
{
}
void adjustScrollbars()
{
verticalScrollBar->nativeWidget()->setMaximum(qMax(0, int((widget->size().height() - scrollingWidget->size().height())/10)));
if (verticalScrollBarPolicy == Qt::ScrollBarAlwaysOff ||
verticalScrollBar->nativeWidget()->maximum() == 0) {
if (layout->count() > 2 && layout->itemAt(2) == verticalScrollBar) {
layout->removeAt(2);
} else if (layout->count() > 1 && layout->itemAt(1) == verticalScrollBar) {
layout->removeAt(1);
}
verticalScrollBar->hide();
} else if (!verticalScrollBar->isVisible()) {
layout->addItem(verticalScrollBar, 0, 1);
verticalScrollBar->show();
}
horizontalScrollBar->nativeWidget()->setMaximum(qMax(0, int((widget->size().width() - scrollingWidget->size().width())/10)));
if (horizontalScrollBarPolicy == Qt::ScrollBarAlwaysOff ||
horizontalScrollBar->nativeWidget()->maximum() == 0) {
if (layout->count() > 2 && layout->itemAt(2) == horizontalScrollBar) {
layout->removeAt(2);
} else if (layout->count() > 1 && layout->itemAt(1) == horizontalScrollBar) {
layout->removeAt(1);
}
horizontalScrollBar->hide();
} else if (!horizontalScrollBar->isVisible()) {
layout->addItem(horizontalScrollBar, 1, 0);
horizontalScrollBar->show();
}
if (widget && !topBorder && widget->size().height() > q->size().height()) {
topBorder = new Plasma::SvgWidget(q);
topBorder->setSvg(borderSvg);
topBorder->setElementID("border-top");
topBorder->setZValue(900);
topBorder->resize(topBorder->effectiveSizeHint(Qt::PreferredSize));
topBorder->show();
bottomBorder = new Plasma::SvgWidget(q);
bottomBorder->setSvg(borderSvg);
bottomBorder->setElementID("border-bottom");
bottomBorder->setZValue(900);
bottomBorder->resize(bottomBorder->effectiveSizeHint(Qt::PreferredSize));
bottomBorder->show();
} else if (topBorder && widget && widget->size().height() <= q->size().height()) {
//FIXME: in some cases topBorder->deleteLater() is deleteNever(), why?
topBorder->hide();
bottomBorder->hide();
topBorder->deleteLater();
bottomBorder->deleteLater();
topBorder = 0;
bottomBorder = 0;
}
if (widget && !leftBorder && widget->size().width() > q->size().width()) {
leftBorder = new Plasma::SvgWidget(q);
leftBorder->setSvg(borderSvg);
leftBorder->setElementID("border-left");
leftBorder->setZValue(900);
leftBorder->resize(leftBorder->effectiveSizeHint(Qt::PreferredSize));
leftBorder->show();
rightBorder = new Plasma::SvgWidget(q);
rightBorder->setSvg(borderSvg);
rightBorder->setElementID("border-right");
rightBorder->setZValue(900);
rightBorder->resize(rightBorder->effectiveSizeHint(Qt::PreferredSize));
rightBorder->show();
} else if (leftBorder && widget && widget->size().width() <= q->size().width()) {
leftBorder->hide();
rightBorder->hide();
leftBorder->deleteLater();
rightBorder->deleteLater();
leftBorder = 0;
rightBorder = 0;
}
layout->activate();
if (topBorder) {
topBorder->resize(q->size().width(), topBorder->size().height());
bottomBorder->resize(q->size().width(), bottomBorder->size().height());
bottomBorder->setPos(0, q->size().height() - topBorder->size().height());
}
if (leftBorder) {
leftBorder->resize(leftBorder->size().width(), q->size().height());
rightBorder->resize(rightBorder->size().width(), q->size().height());
rightBorder->setPos(q->size().width() - rightBorder->size().width(), 0);
}
QSizeF widgetSize = widget->size();
if (widget->sizePolicy().expandingDirections() & Qt::Horizontal) {
//keep a 1 pixel border
widgetSize.setWidth(scrollingWidget->size().width()-borderSize);
}
if (widget->sizePolicy().expandingDirections() & Qt::Vertical) {
widgetSize.setHeight(scrollingWidget->size().height()-borderSize);
}
widget->resize(widgetSize);
}
void verticalScroll(int value)
{
if (!dragging) {
widget->setPos(QPoint(widget->pos().x(), -value*10));
}
}
void horizontalScroll(int value)
{
if (!dragging) {
widget->setPos(QPoint(-value*10, widget->pos().y()));
}
}
void adjustClipping()
{
const bool clip = widget->size().width() > scrollingWidget->size().width() || widget->size().height() > scrollingWidget->size().height();
scrollingWidget->setFlag(QGraphicsItem::ItemClipsChildrenToShape, clip);
}
void makeRectVisible()
{
QRectF viewRect = scrollingWidget->boundingRect();
//ensure the rect is not outside the widget bounding rect
QRectF mappedRect = QRectF(QPointF(qBound((qreal)0.0, rectToBeVisible.x(), widget->size().width() - rectToBeVisible.width()),
qBound((qreal)0.0, rectToBeVisible.y(), widget->size().height() - rectToBeVisible.height())),
rectToBeVisible.size());
mappedRect = widget->mapToItem(scrollingWidget, mappedRect).boundingRect();
if (viewRect.contains(mappedRect)) {
return;
}
QPointF delta(0, 0);
if (mappedRect.top() < 0) {
delta.setY(-mappedRect.top());
} else if (mappedRect.bottom() > viewRect.bottom()) {
delta.setY(viewRect.bottom() - mappedRect.bottom());
}
if (mappedRect.left() < 0) {
delta.setX(-mappedRect.left());
} else if (mappedRect.right() > viewRect.right()) {
delta.setX(viewRect.right() - mappedRect.right());
}
animId = Animator::self()->moveItem(
widget, Plasma::Animator::SlideOutMovement,
(widget->pos() + delta).toPoint());
}
void cleanupDragHandles(QObject *destroyed)
{
dragHandles.remove(static_cast<QGraphicsWidget *>(destroyed));
}
ScrollWidget *q;
QGraphicsWidget *scrollingWidget;
QGraphicsWidget *widget;
Plasma::Svg *borderSvg;
Plasma::SvgWidget *topBorder;
Plasma::SvgWidget *bottomBorder;
Plasma::SvgWidget *leftBorder;
Plasma::SvgWidget *rightBorder;
QGraphicsGridLayout *layout;
ScrollBar *verticalScrollBar;
Qt::ScrollBarPolicy verticalScrollBarPolicy;
ScrollBar *horizontalScrollBar;
Qt::ScrollBarPolicy horizontalScrollBarPolicy;
QString styleSheet;
QRectF rectToBeVisible;
QPointF dragHandleClicked;
QSet<QGraphicsWidget *>dragHandles;
bool dragging;
int animId;
static const int borderSize = 4;
};
ScrollWidget::ScrollWidget(QGraphicsWidget *parent)
: QGraphicsWidget(parent),
d(new ScrollWidgetPrivate(this))
{
setFocusPolicy(Qt::StrongFocus);
d->layout = new QGraphicsGridLayout(this);
setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
d->layout->setContentsMargins(1, 1, 1, 1);
d->scrollingWidget = new QGraphicsWidget(this);
d->layout->addItem(d->scrollingWidget, 0, 0);
d->borderSvg = new Plasma::Svg(this);
d->borderSvg->setImagePath("widgets/scrollwidget");
d->verticalScrollBarPolicy = Qt::ScrollBarAsNeeded;
d->verticalScrollBar = new Plasma::ScrollBar(this);
d->verticalScrollBar->setFocusPolicy(Qt::NoFocus);
d->layout->addItem(d->verticalScrollBar, 0, 1);
d->verticalScrollBar->nativeWidget()->setMinimum(0);
d->verticalScrollBar->nativeWidget()->setMaximum(100);
connect(d->verticalScrollBar, SIGNAL(valueChanged(int)), this, SLOT(verticalScroll(int)));
d->horizontalScrollBarPolicy = Qt::ScrollBarAsNeeded;
d->horizontalScrollBar = new Plasma::ScrollBar(this);
d->verticalScrollBar->setFocusPolicy(Qt::NoFocus);
d->horizontalScrollBar->setOrientation(Qt::Horizontal);
d->layout->addItem(d->horizontalScrollBar, 1, 0);
d->horizontalScrollBar->nativeWidget()->setMinimum(0);
d->horizontalScrollBar->nativeWidget()->setMaximum(100);
connect(d->horizontalScrollBar, SIGNAL(valueChanged(int)), this, SLOT(horizontalScroll(int)));
}
ScrollWidget::~ScrollWidget()
{
delete d;
}
void ScrollWidget::setWidget(QGraphicsWidget *widget)
{
if (d->widget && d->widget != widget) {
d->widget->removeEventFilter(this);
delete d->widget;
}
d->widget = widget;
Plasma::Animator::self()->registerScrollingManager(this);
//it's not good it's setting a size policy here, but it's done to be retrocompatible with older applications
if (widget) {
widget->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Fixed);
widget->setParentItem(d->scrollingWidget);
widget->setPos(QPoint(0,0));
widget->installEventFilter(this);
d->adjustScrollbars();
}
}
QGraphicsWidget *ScrollWidget::widget() const
{
return d->widget;
}
void ScrollWidget::setHorizontalScrollBarPolicy(const Qt::ScrollBarPolicy policy)
{
d->horizontalScrollBarPolicy = policy;
}
Qt::ScrollBarPolicy ScrollWidget::horizontalScrollBarPolicy() const
{
return d->horizontalScrollBarPolicy;
}
void ScrollWidget::setVerticalScrollBarPolicy(const Qt::ScrollBarPolicy policy)
{
d->verticalScrollBarPolicy = policy;
}
Qt::ScrollBarPolicy ScrollWidget::verticalScrollBarPolicy() const
{
return d->verticalScrollBarPolicy;
}
void ScrollWidget::ensureRectVisible(const QRectF &rect)
{
if (!d->widget) {
return;
}
d->rectToBeVisible = rect;
d->makeRectVisible();
}
void ScrollWidget::ensureItemVisible(QGraphicsItem *item)
{
if (!d->widget || !item) {
return;
}
QGraphicsItem *parentOfItem = item->parentItem();
while (parentOfItem != d->widget) {
if (!parentOfItem) {
return;
}
parentOfItem = parentOfItem->parentItem();
}
QRectF rect(d->widget->mapFromScene(item->scenePos()), item->boundingRect().size());
d->rectToBeVisible = rect;
// We need to wait for the parent item to resize...
QTimer::singleShot(0, this, SLOT(makeRectVisible()));
}
void ScrollWidget::registerAsDragHandle(QGraphicsWidget *item)
{
if (!d->widget || !item || d->dragHandles.contains(item)) {
return;
}
QGraphicsItem *parentOfItem = item->parentItem();
while (parentOfItem != d->widget) {
if (!parentOfItem) {
return;
}
parentOfItem = parentOfItem->parentItem();
}
connect(item, SIGNAL(destroyed(QObject *)), this, SLOT(cleanupDragHandles(QObject *)));
item->installEventFilter(this);
d->dragHandles.insert(item);
}
void ScrollWidget::unregisterAsDragHandle(QGraphicsWidget *item)
{
if (item) {
item->removeEventFilter(this);
d->dragHandles.remove(item);
}
}
QRectF ScrollWidget::viewportGeometry() const
{
QRectF result;
if (!d->widget) {
return result;
}
return d->scrollingWidget->boundingRect();
}
QSizeF ScrollWidget::contentsSize() const
{
return d->widget ? d->widget->size() : QSizeF();
}
void ScrollWidget::setScrollPosition(const QPointF &position)
{
if (d->widget) {
d->widget->setPos(-position.toPoint());
}
}
QPointF ScrollWidget::scrollPosition() const
{
return d->widget ? -d->widget->pos() : QPointF();
}
void ScrollWidget::setStyleSheet(const QString &styleSheet)
{
d->styleSheet = styleSheet;
d->verticalScrollBar->setStyleSheet(styleSheet);
d->horizontalScrollBar->setStyleSheet(styleSheet);
}
QString ScrollWidget::styleSheet() const
{
return d->styleSheet;
}
QWidget *ScrollWidget::nativeWidget() const
{
return 0;
}
void ScrollWidget::focusInEvent(QFocusEvent *event)
{
Q_UNUSED(event)
if (d->widget) {
d->widget->setFocus();
}
}
void ScrollWidget::resizeEvent(QGraphicsSceneResizeEvent *event)
{
if (!d->widget) {
return;
}
d->adjustScrollbars();
d->adjustClipping();
//if topBorder exists bottomBorder too
if (d->topBorder) {
d->topBorder->resize(event->newSize().width(), d->topBorder->size().height());
d->bottomBorder->resize(event->newSize().width(), d->bottomBorder->size().height());
d->bottomBorder->setPos(0, event->newSize().height() - d->bottomBorder->size().height());
}
if (d->leftBorder) {
d->leftBorder->resize(d->leftBorder->size().width(), event->newSize().height());
d->rightBorder->resize(d->rightBorder->size().width(), event->newSize().height());
d->rightBorder->setPos(event->newSize().width() - d->rightBorder->size().width(), 0);
}
QGraphicsWidget::resizeEvent(event);
}
void ScrollWidget::mouseMoveEvent(QGraphicsSceneMouseEvent *event)
{
if (!d->widget) {
return;
}
if (d->animId) {
Animator::self()->stopItemMovement(d->animId);
}
event->ignore();
}
void ScrollWidget::mousePressEvent(QGraphicsSceneMouseEvent *event)
{
if (!(event->buttons() & Qt::LeftButton)) {
event->ignore();
}
if (d->animId) {
Animator::self()->stopItemMovement(d->animId);
}
}
void ScrollWidget::mouseReleaseEvent(QGraphicsSceneMouseEvent *event)
{
event->ignore();
}
void ScrollWidget::wheelEvent(QGraphicsSceneWheelEvent *event)
{
if (d->animId) {
Animator::self()->stopItemMovement(d->animId);
}
}
bool ScrollWidget::eventFilter(QObject *watched, QEvent *event)
{
if (!d->widget) {
return false;
}
if (watched == d->widget && event->type() == QEvent::GraphicsSceneResize) {
d->adjustScrollbars();
d->adjustClipping();
//force to refresh the size hint
layout()->invalidate();
} else if (watched == d->widget && event->type() == QEvent::GraphicsSceneMove) {
d->horizontalScrollBar->blockSignals(true);
d->verticalScrollBar->blockSignals(true);
d->horizontalScrollBar->setValue(-d->widget->pos().x()/10);
d->verticalScrollBar->setValue(-d->widget->pos().y()/10);
d->horizontalScrollBar->blockSignals(false);
d->verticalScrollBar->blockSignals(false);
} else if (d->dragHandles.contains(static_cast<QGraphicsWidget *>(watched))) {
if (event->type() == QEvent::GraphicsSceneMousePress ||
event->type() == QEvent::GraphicsSceneMouseMove ||
event->type() == QEvent::GraphicsSceneMouseRelease) {
if (scene()) {
scene()->sendEvent(this, event);
}
QGraphicsSceneMouseEvent *me = static_cast<QGraphicsSceneMouseEvent *>(event);
if (event->type() == QEvent::GraphicsSceneMousePress) {
d->dragHandleClicked = me->scenePos();
} else if (event->type() == QEvent::GraphicsSceneMouseRelease &&
(d->dragHandleClicked.toPoint() - me->scenePos().toPoint()).manhattanLength() > KGlobalSettings::dndEventDelay()) {
return true;
}
}
}
return false;
}
QSizeF ScrollWidget::sizeHint(Qt::SizeHint which, const QSizeF & constraint) const
{
QSizeF hint = QGraphicsWidget::sizeHint(which, constraint);
if (which == Qt::PreferredSize && d->widget) {
return (d->widget->size()+QSize(d->borderSize, d->borderSize)).expandedTo(d->widget->effectiveSizeHint(Qt::PreferredSize));
}
return hint;
}
} // namespace Plasma
#include <scrollwidget.moc>