a widget that allows the contents to scroll when
content is bigger than the widget itself by adding scrollbars svn path=/trunk/KDE/kdelibs/; revision=934731
This commit is contained in:
Marco Martin
parent
546895b775
commit
ff578a8af4
@ -116,6 +116,7 @@ set(plasma_LIB_SRCS
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widgets/spinbox.cpp
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widgets/toolbutton.cpp
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widgets/busywidget.cpp
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widgets/scrollwidget.cpp
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widgets/svgwidget.cpp
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widgets/tabbar.cpp
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widgets/treeview.cpp
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@ -251,6 +252,7 @@ install(FILES
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widgets/spinbox.h
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widgets/busywidget.h
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widgets/svgwidget.h
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widgets/scrollwidget.h
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widgets/tabbar.h
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widgets/treeview.h
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widgets/textedit.h
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280
widgets/scrollwidget.cpp
Normal file
280
widgets/scrollwidget.cpp
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@ -0,0 +1,280 @@
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/*
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* Copyright 2009 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 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 "scrollwidget.h"
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//Qt
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#include <QGraphicsSceneResizeEvent>
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#include <QGraphicsGridLayout>
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#include <QApplication>
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#include <QWidget>
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//KDE
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#include <kmimetype.h>
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#include <kdebug.h>
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//Plasma
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#include <plasma/widgets/scrollbar.h>
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namespace Plasma
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{
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class ScrollWidgetPrivate
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{
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public:
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ScrollWidgetPrivate(ScrollWidget *parent)
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: q(parent),
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widget(0),
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dragging(false)
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{
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}
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~ScrollWidgetPrivate()
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{
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}
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void adjustScrollbars()
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{
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verticalScrollBar->nativeWidget()->setMaximum(qMax(0, int((widget->size().height() - scrollingWidget->size().height())/10)));
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if (verticalScrollBarPolicy == Qt::ScrollBarAlwaysOff ||
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verticalScrollBar->nativeWidget()->maximum() == 0) {
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if (layout->itemAt(2) == verticalScrollBar) {
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layout->removeAt(2);
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} else if (layout->itemAt(1) == verticalScrollBar) {
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layout->removeAt(1);
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}
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verticalScrollBar->hide();
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} else if (!verticalScrollBar->isVisible()) {
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layout->addItem(verticalScrollBar, 0, 1);
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verticalScrollBar->show();
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}
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horizontalScrollBar->nativeWidget()->setMaximum(qMax(0, int((widget->size().width() - scrollingWidget->size().width())/10)));
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if (horizontalScrollBarPolicy == Qt::ScrollBarAlwaysOff ||
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horizontalScrollBar->nativeWidget()->maximum() == 0) {
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if (layout->itemAt(2) == horizontalScrollBar) {
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layout->removeAt(2);
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} else if (layout->itemAt(1) == horizontalScrollBar) {
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layout->removeAt(1);
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}
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horizontalScrollBar->hide();
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} else if (!horizontalScrollBar->isVisible()) {
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layout->addItem(horizontalScrollBar, 1, 0);
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horizontalScrollBar->show();
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}
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}
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void verticalScroll(int value)
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{
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if (!dragging) {
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widget->setPos(QPoint(0, -value*10));
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}
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}
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void horizontalScroll(int value)
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{
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if (!dragging) {
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widget->setPos(QPoint(-value*10, 0));
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}
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}
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void adjustClipping()
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{
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const bool clip = widget->size().width() > scrollingWidget->size().width() ||
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widget->size().height() > scrollingWidget->size().height();
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scrollingWidget->setFlag(QGraphicsItem::ItemClipsChildrenToShape, clip);
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}
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ScrollWidget *q;
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QGraphicsWidget *scrollingWidget;
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QGraphicsWidget *widget;
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QGraphicsGridLayout *layout;
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ScrollBar *verticalScrollBar;
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Qt::ScrollBarPolicy verticalScrollBarPolicy;
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ScrollBar *horizontalScrollBar;
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Qt::ScrollBarPolicy horizontalScrollBarPolicy;
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QString styleSheet;
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bool dragging;
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};
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ScrollWidget::ScrollWidget(QGraphicsWidget *parent)
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: QGraphicsWidget(parent),
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d(new ScrollWidgetPrivate(this))
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{
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setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
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d->layout = new QGraphicsGridLayout(this);
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d->scrollingWidget = new QGraphicsWidget(this);
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d->layout->addItem(d->scrollingWidget, 0, 0);
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d->verticalScrollBarPolicy = Qt::ScrollBarAsNeeded;
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d->verticalScrollBar = new Plasma::ScrollBar(this);
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d->layout->addItem(d->verticalScrollBar, 0, 1);
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d->verticalScrollBar->nativeWidget()->setMinimum(0);
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d->verticalScrollBar->nativeWidget()->setMaximum(100);
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connect(d->verticalScrollBar, SIGNAL(valueChanged(int)), this, SLOT(verticalScroll(int)));
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d->horizontalScrollBarPolicy = Qt::ScrollBarAsNeeded;
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d->horizontalScrollBar = new Plasma::ScrollBar(this);
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d->horizontalScrollBar->setOrientation(Qt::Horizontal);
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d->layout->addItem(d->horizontalScrollBar, 1, 0);
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d->horizontalScrollBar->nativeWidget()->setMinimum(0);
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d->horizontalScrollBar->nativeWidget()->setMaximum(100);
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connect(d->horizontalScrollBar, SIGNAL(valueChanged(int)), this, SLOT(horizontalScroll(int)));
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}
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ScrollWidget::~ScrollWidget()
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{
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delete d;
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}
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void ScrollWidget::setWidget(QGraphicsWidget *widget)
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{
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if (d->widget && d->widget != widget) {
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d->widget->removeEventFilter(this);
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delete d->widget;
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}
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d->widget = widget;
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widget->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Fixed);
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widget->setParentItem(d->scrollingWidget);
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widget->setPos(QPoint(0,0));
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widget->installEventFilter(this);
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d->adjustScrollbars();
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}
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QGraphicsWidget *ScrollWidget::widget() const
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{
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return d->widget;
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}
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void ScrollWidget::setHorizontalScrollbarPolicy(const Qt::ScrollBarPolicy policy)
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{
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d->horizontalScrollBarPolicy = policy;
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}
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Qt::ScrollBarPolicy ScrollWidget::horizontalScrollbarPolicy() const
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{
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return d->horizontalScrollBarPolicy;
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}
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void ScrollWidget::setVerticalScrollbarPolicy(const Qt::ScrollBarPolicy policy)
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{
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d->verticalScrollBarPolicy = policy;
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}
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Qt::ScrollBarPolicy ScrollWidget::verticalScrollbarPolicy() const
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{
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return d->verticalScrollBarPolicy;
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}
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void ScrollWidget::setStyleSheet(const QString &styleSheet)
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{
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d->styleSheet = styleSheet;
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d->verticalScrollBar->setStyleSheet(styleSheet);
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d->horizontalScrollBar->setStyleSheet(styleSheet);
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}
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QString ScrollWidget::styleSheet() const
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{
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return d->styleSheet;
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}
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QWidget *ScrollWidget::nativeWidget() const
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{
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return 0;
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}
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void ScrollWidget::resizeEvent(QGraphicsSceneResizeEvent *event)
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{
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if (!d->widget) {
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return;
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}
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d->widget->resize(d->scrollingWidget->size());
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d->adjustScrollbars();
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d->adjustClipping();
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QGraphicsWidget::resizeEvent(event);
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}
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void ScrollWidget::mouseMoveEvent(QGraphicsSceneMouseEvent *event)
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{
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if (!d->widget) {
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return;
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}
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QPointF deltaPos = event->pos() - event->lastPos();
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d->widget->setPos(qBound(-d->widget->size().width()+d->scrollingWidget->size().width(), d->widget->pos().x()+deltaPos.x(), (qreal)0),
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qBound(-d->widget->size().height()+d->scrollingWidget->size().height(), d->widget->pos().y()+deltaPos.y(), (qreal)0));
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d->dragging = true;
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d->horizontalScrollBar->setValue(-d->widget->pos().x()/10);
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d->verticalScrollBar->setValue(-d->widget->pos().y()/10);
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d->dragging = false;
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QGraphicsWidget::mouseMoveEvent(event);
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}
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void ScrollWidget::mousePressEvent(QGraphicsSceneMouseEvent *event)
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{
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event->accept();
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}
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void ScrollWidget::wheelEvent(QGraphicsSceneWheelEvent *event)
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{
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if (event->delta() < 0) {
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d->verticalScrollBar->setValue(d->verticalScrollBar->value()+10);
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} else {
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d->verticalScrollBar->setValue(d->verticalScrollBar->value()-10);
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}
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QGraphicsWidget::wheelEvent(event);
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}
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bool ScrollWidget::eventFilter(QObject *watched, QEvent *event)
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{
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if (!d->widget) {
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return false;
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}
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if (watched == d->widget && event->type() == QEvent::GraphicsSceneResize) {
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d->adjustScrollbars();
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d->adjustClipping();
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}
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return false;
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}
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} // namespace Plasma
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#include <scrollwidget.moc>
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131
widgets/scrollwidget.h
Normal file
131
widgets/scrollwidget.h
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@ -0,0 +1,131 @@
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/*
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* Copyright 2009 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 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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#ifndef PLASMA_SCROLLWIDGET_H
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#define PLASMA_SCROLLWIDGET_H
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#include <QtGui/QGraphicsWidget>
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#include <plasma/plasma_export.h>
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namespace Plasma
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{
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class ScrollWidgetPrivate;
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/**
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* @class ScrollWidget plasma/widgets/ScrollWidget.h <Plasma/Widgets/ScrollWidget>
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*
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* @short A container of widgets that can have scrollbars
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*
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* A container of widgets that can have horizontal and vertical scrollbars if the content is bigger than the widget itself
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*/
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class PLASMA_EXPORT ScrollWidget : public QGraphicsWidget
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{
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Q_OBJECT
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Q_PROPERTY(QGraphicsWidget *widget READ widget WRITE setWidget)
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Q_PROPERTY(Qt::ScrollBarPolicy horizontalScrollbarPolicy READ horizontalScrollbarPolicy WRITE setHorizontalScrollbarPolicy)
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Q_PROPERTY(Qt::ScrollBarPolicy verticalScrollbarPolicy READ verticalScrollbarPolicy WRITE setVerticalScrollbarPolicy)
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Q_PROPERTY(QString styleSheet READ styleSheet WRITE setStyleSheet)
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public:
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/**
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* Constructs a new ScrollWidget
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*
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* @arg parent the parent of this widget
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*/
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explicit ScrollWidget(QGraphicsWidget *parent = 0);
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~ScrollWidget();
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/**
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* Sets the widget this ScrollWidget will contain
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* ownership is transferred to this scrollwidget,
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* if an old one was already in, it will be deleted
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*
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* @arg widget the new main sub widget
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*/
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void setWidget(QGraphicsWidget *widget);
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/**
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* @return the main widget
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*/
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QGraphicsWidget *widget() const;
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/**
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* Sets the horizontal scrollbar policy
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*
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* @arg policy desired policy
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*/
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void setHorizontalScrollbarPolicy(const Qt::ScrollBarPolicy policy);
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/**
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* @return the horizontal scrollbar policy
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*/
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Qt::ScrollBarPolicy horizontalScrollbarPolicy() const;
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/**
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* Sets the vertical scrollbar policy
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*
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* @arg policy desired policy
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*/
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void setVerticalScrollbarPolicy(const Qt::ScrollBarPolicy policy);
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/**
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* @return the vertical scrollbar policy
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*/
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Qt::ScrollBarPolicy verticalScrollbarPolicy() const;
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/**
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* Sets the stylesheet used to control the visual display of this ScrollWidget
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*
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* @arg stylesheet a CSS string
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*/
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void setStyleSheet(const QString &stylesheet);
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/**
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* @return the stylesheet currently used with this widget
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*/
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QString styleSheet() const;
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/**
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* @return the native widget wrapped by this ScrollWidget
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*/
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QWidget *nativeWidget() const;
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protected:
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void resizeEvent(QGraphicsSceneResizeEvent *event);
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void mouseMoveEvent(QGraphicsSceneMouseEvent *event);
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void mousePressEvent(QGraphicsSceneMouseEvent *event);
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void wheelEvent(QGraphicsSceneWheelEvent *event);
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bool eventFilter(QObject *watched, QEvent *event);
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private:
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ScrollWidgetPrivate * const d;
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Q_PRIVATE_SLOT(d, void verticalScroll(int value))
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Q_PRIVATE_SLOT(d, void horizontalScroll(int value))
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};
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} // namespace Plasma
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#endif // multiple inclusion guard
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