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java.lang.Objectcom.trolltech.qt.QSignalEmitter
com.trolltech.qt.QtJambiObject
com.trolltech.qt.core.QObject
com.trolltech.qt.gui.QWidget
com.trolltech.qt.gui.QSplitterHandle
public class QSplitterHandle
The QSplitterHandle class provides handle functionality of the splitter.
QSplitterHandle is typically what people think about when they think about a splitter. It is the handle that is used to resize the widgets.
A typical developer using QSplitter will never have to worry about QSplitterHandle. It is provided for developers who want splitter handles that provide extra features, such as popup menus.
The typical way one would create splitter handles is to subclass QSplitter then reimplement QSplitter::createHandle() to instantiate the custom splitter handle. For example, a minimum QSplitter subclass might look like this:
class Splitter : public QSplitter { public: Splitter(Qt::Orientation orientation, QWidget *parent = 0); protected: QSplitterHandle *createHandle(); };
The createHandle() implementation simply constructs a custom splitter handle, called Splitter in this example:
QSplitterHandle *Splitter::createHandle() { return new SplitterHandle(orientation(), this); }
Information about a given handle can be obtained using functions like orientation and opaqueResize, and is retrieved from its parent splitter. Details like these can be used to give custom handles different appearances depending on the splitter's orientation.
The complexity of a custom handle subclass depends on the tasks that it needs to perform. A simple subclass might only provide a paintEvent implementation:
void SplitterHandle::paintEvent(QPaintEvent *event) { QPainter painter(this); if (orientation() == Qt::Horizontal) { gradient.setStart(rect().left(), rect().height()/2); gradient.setFinalStop(rect().right(), rect().height()/2); } else { gradient.setStart(rect().width()/2, rect().top()); gradient.setFinalStop(rect().width()/2, rect().bottom()); } painter.fillRect(event->rect(), QBrush(gradient)); }
In this example, a predefined gradient is set up differently depending on the orientation of the handle. QSplitterHandle provides a reasonable size hint for the handle, so the subclass does not need to provide a reimplementation of sizeHint unless the handle has special size requirements.
Nested Class Summary |
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Nested classes/interfaces inherited from class com.trolltech.qt.gui.QWidget |
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QWidget.RenderFlag, QWidget.RenderFlags |
Nested classes/interfaces inherited from class com.trolltech.qt.QSignalEmitter |
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QSignalEmitter.AbstractSignal, QSignalEmitter.Signal0, QSignalEmitter.Signal1<A>, QSignalEmitter.Signal2<A,B>, QSignalEmitter.Signal3<A,B,C>, QSignalEmitter.Signal4<A,B,C,D>, QSignalEmitter.Signal5<A,B,C,D,E>, QSignalEmitter.Signal6<A,B,C,D,E,F>, QSignalEmitter.Signal7<A,B,C,D,E,F,G>, QSignalEmitter.Signal8<A,B,C,D,E,F,G,H>, QSignalEmitter.Signal9<A,B,C,D,E,F,G,H,I> |
Field Summary |
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Fields inherited from class com.trolltech.qt.gui.QWidget |
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customContextMenuRequested |
Constructor Summary | |
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QSplitterHandle(Qt.Orientation o,
QSplitter parent)
Creates a QSplitter handle with the given o and QSplitter parent. |
Method Summary | |
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protected int |
closestLegalPosition(int p)
Returns the closest legal position to p of the splitter handle. |
boolean |
event(QEvent arg__1)
This function is reimplemented for internal reasons. |
static QSplitterHandle |
fromNativePointer(QNativePointer nativePointer)
This function returns the QSplitterHandle instance pointed to by nativePointer |
protected void |
mouseMoveEvent(QMouseEvent arg__1)
This function is reimplemented for internal reasons. |
protected void |
mousePressEvent(QMouseEvent arg__1)
This function is reimplemented for internal reasons. |
protected void |
mouseReleaseEvent(QMouseEvent arg__1)
This function is reimplemented for internal reasons. |
protected void |
moveSplitter(int p)
Tells the splitter to move this handle to position p, which is the distance from the left or top edge of the widget. |
boolean |
opaqueResize()
Returns true if widgets are resized dynamically (opaquely), otherwise returns false. |
Qt.Orientation |
orientation()
Returns the handle's orientation. |
protected void |
paintEvent(QPaintEvent arg__1)
This function is reimplemented for internal reasons. |
void |
setOrientation(Qt.Orientation o)
Sets the orientation of the splitter handle to o. |
QSize |
sizeHint()
This function is reimplemented for internal reasons. |
QSplitter |
splitter()
Returns the splitter associated with this splitter handle. |
Methods inherited from class com.trolltech.qt.core.QObject |
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blockSignals, childEvent, children, connectSlotsByName, customEvent, disposeLater, dumpObjectInfo, dumpObjectTree, dynamicPropertyNames, eventFilter, findChild, findChild, findChild, findChildren, findChildren, findChildren, findChildren, installEventFilter, isWidgetType, killTimer, moveToThread, objectName, parent, property, removeEventFilter, setObjectName, setParent, setProperty, signalsBlocked, startTimer, thread, timerEvent |
Methods inherited from class com.trolltech.qt.QtJambiObject |
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dispose, disposed, finalize, reassignNativeResources, tr, tr, tr |
Methods inherited from class com.trolltech.qt.QSignalEmitter |
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disconnect, disconnect, signalSender |
Methods inherited from class java.lang.Object |
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clone, equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Methods inherited from interface com.trolltech.qt.QtJambiInterface |
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disableGarbageCollection, nativeId, nativePointer, reenableGarbageCollection, setJavaOwnership |
Constructor Detail |
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public QSplitterHandle(Qt.Orientation o, QSplitter parent)
Method Detail |
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protected final int closestLegalPosition(int p)
Returns the closest legal position to p of the splitter handle. The positions are measured from the left or top edge of the splitter, even for right-to-left languages.
protected final void moveSplitter(int p)
Tells the splitter to move this handle to position p, which is the distance from the left or top edge of the widget.
Note that p is also measured from the left (or top) for right-to-left languages. This function will map p to the appropriate position before calling QSplitter::moveSplitter().
public final boolean opaqueResize()
Returns true if widgets are resized dynamically (opaquely), otherwise returns false. This value is controlled by the QSplitter.
public final Qt.Orientation orientation()
Returns the handle's orientation. This is usually propagated from the QSplitter.
public final void setOrientation(Qt.Orientation o)
Sets the orientation of the splitter handle to o. This is usually propogated from the QSplitter.
public final QSplitter splitter()
Returns the splitter associated with this splitter handle.
public boolean event(QEvent arg__1)
This function is reimplemented for internal reasons.
event
in class QWidget
protected void mouseMoveEvent(QMouseEvent arg__1)
This function is reimplemented for internal reasons.
mouseMoveEvent
in class QWidget
Example
protected void mousePressEvent(QMouseEvent arg__1)
This function is reimplemented for internal reasons.
mousePressEvent
in class QWidget
Example
protected void mouseReleaseEvent(QMouseEvent arg__1)
This function is reimplemented for internal reasons.
mouseReleaseEvent
in class QWidget
Example
protected void paintEvent(QPaintEvent arg__1)
This function is reimplemented for internal reasons.
paintEvent
in class QWidget
public QSize sizeHint()
This function is reimplemented for internal reasons.
sizeHint
in class QWidget
public static QSplitterHandle fromNativePointer(QNativePointer nativePointer)
nativePointer
- the QNativePointer of which object should be returned.
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