plasma-framework/widgets/scrollwidget.h

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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.
*/
#ifndef PLASMA_SCROLLWIDGET_H
#define PLASMA_SCROLLWIDGET_H
#include <QtCore/QAbstractAnimation>
#include <QtGui/QGraphicsWidget>
#include <plasma/plasma_export.h>
namespace Plasma
{
class ScrollWidgetPrivate;
/**
* @class ScrollWidget plasma/widgets/ScrollWidget.h <Plasma/Widgets/ScrollWidget>
*
* @short A container of widgets that can have scrollbars
*
* A container of widgets that can have horizontal and vertical scrollbars if the content is bigger than the widget itself
*
* @since 4.3
*/
class PLASMA_EXPORT ScrollWidget : public QGraphicsWidget
{
Q_OBJECT
Q_PROPERTY(QGraphicsWidget *widget READ widget WRITE setWidget)
Q_PROPERTY(Qt::ScrollBarPolicy horizontalScrollBarPolicy READ horizontalScrollBarPolicy WRITE setHorizontalScrollBarPolicy)
Q_PROPERTY(Qt::ScrollBarPolicy verticalScrollBarPolicy READ verticalScrollBarPolicy WRITE setVerticalScrollBarPolicy)
Q_PROPERTY(bool overflowBordersVisible READ overflowBordersVisible WRITE setOverflowBordersVisible)
Q_PROPERTY(QPointF scrollPosition READ scrollPosition WRITE setScrollPosition)
Q_PROPERTY(QSizeF contentsSize READ contentsSize)
Q_PROPERTY(QRectF viewportGeometry READ viewportGeometry)
Q_PROPERTY(QSizeF snapSize READ snapSize WRITE setSnapSize)
Q_PROPERTY(QString styleSheet READ styleSheet WRITE setStyleSheet)
Q_PROPERTY(Qt::Alignment alignment READ alignment WRITE setAlignment)
Q_PROPERTY(bool overShoot READ hasOverShoot WRITE setOverShoot)
public:
/**
* Constructs a new ScrollWidget
*
* @arg parent the parent of this widget
*/
explicit ScrollWidget(QGraphicsWidget *parent = 0);
explicit ScrollWidget(QGraphicsItem *parent);
~ScrollWidget();
/**
* Sets the widget this ScrollWidget will contain
* ownership is transferred to this scrollwidget,
* if an old one was already in, it will be deleted.
* If the widget size policy allows for horizontal and/or vertical expansion,
* it will be resized when possible, otherwise it will be kept to whichever
* width the widget resizes itself.
*
* @arg widget the new main sub widget
*/
void setWidget(QGraphicsWidget *widget);
/**
* @return the main widget
*/
QGraphicsWidget *widget() const;
/**
* Sets the alignment for the inner widget.
* It is only meaningful if the inner widget is smaller
* than the viewport.
* @since 4.5
*/
void setAlignment(Qt::Alignment align);
/**
* @return currently set alignment for the inner widget
* @since 4.5
*/
Qt::Alignment alignment() const;
/**
* Tells the scrollwidget whether the widget can scroll a little
* beyond its boundaries and then automatically snap back or
* whether the widget scrolling always stops at the edges.
* @since 4.5
*/
void setOverShoot(bool enable);
/**
* @return true if overshoot is enabled
* @since 4.5
*/
bool hasOverShoot() const;
/**
* Sets the horizontal scrollbar policy
*
* @arg policy desired policy
*/
void setHorizontalScrollBarPolicy(const Qt::ScrollBarPolicy policy);
/**
* @return the horizontal scrollbar policy
*/
Qt::ScrollBarPolicy horizontalScrollBarPolicy() const;
/**
* Sets the vertical scrollbar policy
*
* @arg policy desired policy
*/
void setVerticalScrollBarPolicy(const Qt::ScrollBarPolicy policy);
/**
* @return the vertical scrollbar policy
*/
Qt::ScrollBarPolicy verticalScrollBarPolicy() const;
/**
* @return true if the widget shows borders when the inner widget
* is bigger than the viewport
* @since 4.6
*/
bool overflowBordersVisible() const;
/**
* Sets whether borders should be shown when the inner widget
* is bigger than the viewport
* @param visible true if the border should be visible when
* the inner widget overflows
* @since 4.6
*/
void setOverflowBordersVisible(const bool visible);
/**
* Scroll the view until the given rectangle is visible
*
* @param rect rect we want visible, in coordinates mapped to the inner widget
* @since 4.4
*/
Q_INVOKABLE void ensureRectVisible(const QRectF &rect);
/**
* Scroll the view until the given item is visible
*
* @param item item we want visible
* @since 4.4
*/
Q_INVOKABLE void ensureItemVisible(QGraphicsItem *item);
/**
* Register an item as a drag handle, it means mouse events will pass trough it
* and will be possible to drag the view by dragging the item itself.
* The item will still receive mouse clicks if the mouse didn't move
* between press and release.
*
* This function is no more necessary, since it's the authomatic behaviour
* for all children items, the implementation has now no effect
*
* @param item the drag handle item. widget() must be an ancestor if it in
* the parent hierarchy. if item doesn't accept mose press events
* it's not necessary to call this function.
* @since 4.4
*/
#ifndef KDE_NO_DEPRECATED
KDE_DEPRECATED Q_INVOKABLE void registerAsDragHandle(QGraphicsWidget *item);
#endif
/**
* Unregister the given item as drag handle (if it was registered)
*
* This function is no more necessary, since it's the authomatic behaviour
* for all children items, the implementation has now no effect
*
* @since 4.4
*/
#ifndef KDE_NO_DEPRECATED
KDE_DEPRECATED Q_INVOKABLE void unregisterAsDragHandle(QGraphicsWidget *item);
#endif
/**
* The geometry of the viewport.
* @since 4.4
*/
QRectF viewportGeometry() const;
/**
* @return the size of the internal widget
* @since 4.4
*/
QSizeF contentsSize() const;
/**
* Sets the position of the internal widget relative to this widget
* @since 4.4
*/
void setScrollPosition(const QPointF &position);
/**
* @return the position of the internal widget relative to this widget
* @since 4.4
*/
QPointF scrollPosition() const;
/**
* Set the nap size of the kinetic scrolling:
* the scrolling will always stop at multiples of that size.
*
* @arg the desired snap size
* @since 4.5
*/
void setSnapSize(const QSizeF &size);
/**
* @return the snap size of the kinetic scrolling
* @since 4.5
*/
QSizeF snapSize() const;
/**
* Sets the stylesheet used to control the visual display of this ScrollWidget
*
* @arg stylesheet a CSS string
*/
void setStyleSheet(const QString &stylesheet);
/**
* @return the stylesheet currently used with this widget
*/
QString styleSheet() const;
/**
* @return the native widget wrapped by this ScrollWidget
*/
QWidget *nativeWidget() const;
Q_SIGNALS:
/**
* The widget started or stopped an animated scroll
* @since 4.4
*/
void scrollStateChanged(QAbstractAnimation::State newState,
QAbstractAnimation::State oldState);
/**
* The viewport geomety changed, for instance due a widget resize
*
* @since 4.5
*/
void viewportGeometryChanged(const QRectF &geomety);
protected:
void resizeEvent(QGraphicsSceneResizeEvent *event);
void mouseMoveEvent(QGraphicsSceneMouseEvent *event);
void mousePressEvent(QGraphicsSceneMouseEvent *event);
void mouseReleaseEvent(QGraphicsSceneMouseEvent *event);
void keyPressEvent(QKeyEvent *event);
void wheelEvent(QGraphicsSceneWheelEvent *event);
bool eventFilter(QObject *watched, QEvent *event);
void focusInEvent(QFocusEvent *event);
QSizeF sizeHint(Qt::SizeHint which, const QSizeF & constraint) const;
bool sceneEventFilter(QGraphicsItem *i, QEvent *e);
private:
ScrollWidgetPrivate * const d;
Q_PRIVATE_SLOT(d, void verticalScroll(int value))
Q_PRIVATE_SLOT(d, void horizontalScroll(int value))
Q_PRIVATE_SLOT(d, void makeRectVisible())
Q_PRIVATE_SLOT(d, void makeItemVisible())
Q_PRIVATE_SLOT(d, void adjustScrollbars())
Q_PRIVATE_SLOT(d, void fixupX())
Q_PRIVATE_SLOT(d, void fixupY())
Q_PRIVATE_SLOT(d, void setScrollX())
Q_PRIVATE_SLOT(d, void setScrollY())
friend class ScrollWidgetPrivate;
};
} // namespace Plasma
#endif // multiple inclusion guard