257 lines
7.8 KiB
C++
257 lines
7.8 KiB
C++
/*
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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 <QtCore/QAbstractAnimation>
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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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* @since 4.3
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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(QPointF scrollPosition READ scrollPosition WRITE setScrollPosition)
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Q_PROPERTY(QSizeF contentsSize READ contentsSize)
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Q_PROPERTY(QRectF viewportGeometry READ viewportGeometry)
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Q_PROPERTY(QString styleSheet READ styleSheet WRITE setStyleSheet)
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Q_PROPERTY(Qt::Alignment alignment READ alignment WRITE setAlignment)
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Q_PROPERTY(bool overShoot READ hasOverShoot WRITE setOverShoot)
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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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explicit ScrollWidget(QGraphicsItem *parent);
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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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* If the widget size policy allows for horizontal and/or vertical expansion,
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* it will be resized when possible, otherwise it will be kept to whichever
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* width the widget resizes itself.
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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 alignment for the inner widget.
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* It is only meaningful if the inner widget is smaller
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* than the viewport.
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* @since 4.5
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*/
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void setAlignment(Qt::Alignment align);
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/**
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* @return currently set alignment for the inner widget
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* @since 4.5
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*/
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Qt::Alignment alignment() const;
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/**
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* Tells the scrollwidget whether the widget can scroll a little
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* beyond its boundaries and then automatically snap back or
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* whether the widget scrolling always stops at the edges.
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* @since 4.5
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*/
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void setOverShoot(bool enable);
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/**
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* @return true if overshoot is enabled
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* @since 4.5
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*/
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bool hasOverShoot() 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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* Scroll the view until the given rectangle is visible
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*
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* @param rect rect we want visible, in coordinates mapped to the inner widget
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* @since 4.4
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*/
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Q_INVOKABLE void ensureRectVisible(const QRectF &rect);
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/**
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* Scroll the view until the given item is visible
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*
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* @param item item we want visible
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* @since 4.4
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*/
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Q_INVOKABLE void ensureItemVisible(QGraphicsItem *item);
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/**
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* Register an item as a drag handle, it means mouse events will pass trough it
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* and will be possible to drag the view by dragging the item itself.
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* The item will still receive mouse clicks if the mouse didn't move
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* between press and release.
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*
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* This function is no more necessary, since it's the authomatic behaviour
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* for all children items, the implementation has now no effect
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*
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* @param item the drag handle item. widget() must be an ancestor if it in
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* the parent hierarchy. if item doesn't accept mose press events
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* it's not necessary to call this function.
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* @since 4.4
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*/
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KDE_DEPRECATED Q_INVOKABLE void registerAsDragHandle(QGraphicsWidget *item);
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/**
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* Unregister the given item as drag handle (if it was registered)
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*
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* This function is no more necessary, since it's the authomatic behaviour
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* for all children items, the implementation has now no effect
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*
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* @since 4.4
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*/
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KDE_DEPRECATED Q_INVOKABLE void unregisterAsDragHandle(QGraphicsWidget *item);
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/**
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* The geometry of the viewport.
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* @since 4.4
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*/
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QRectF viewportGeometry() const;
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/**
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* @return the size of the internal widget
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* @since 4.4
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*/
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QSizeF contentsSize() const;
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/**
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* Sets the position of the internal widget relative to this widget
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* @since 4.4
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*/
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void setScrollPosition(const QPointF &position);
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/**
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* @return the position of the internal widget relative to this widget
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* @since 4.4
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*/
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QPointF scrollPosition() 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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Q_SIGNALS:
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void scrollStateChanged(QAbstractAnimation::State newState,
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QAbstractAnimation::State oldState);
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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 mouseReleaseEvent(QGraphicsSceneMouseEvent *event);
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void wheelEvent(QGraphicsSceneWheelEvent *event);
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bool eventFilter(QObject *watched, QEvent *event);
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void focusInEvent(QFocusEvent *event);
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QSizeF sizeHint(Qt::SizeHint which, const QSizeF & constraint) const;
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bool sceneEventFilter(QGraphicsItem *i, QEvent *e);
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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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Q_PRIVATE_SLOT(d, void makeRectVisible())
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Q_PRIVATE_SLOT(d, void makeItemVisible())
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Q_PRIVATE_SLOT(d, void adjustScrollbars())
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Q_PRIVATE_SLOT(d, void fixupX())
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Q_PRIVATE_SLOT(d, void fixupY())
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Q_PRIVATE_SLOT(d, void setScrollX())
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Q_PRIVATE_SLOT(d, void setScrollY())
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friend class ScrollWidgetPrivate;
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};
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} // namespace Plasma
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#endif // multiple inclusion guard
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