void ScrollZoomer::updateScrollBars()
{
if ( !canvas() )
return;
const int xAxis = QwtPlotZoomer::xAxis();
const int yAxis = QwtPlotZoomer::yAxis();
int xScrollBarAxis = xAxis;
if ( hScrollBarPosition() == OppositeToScale )
xScrollBarAxis = oppositeAxis(xScrollBarAxis);
int yScrollBarAxis = yAxis;
if ( vScrollBarPosition() == OppositeToScale )
yScrollBarAxis = oppositeAxis(yScrollBarAxis);
QwtPlotLayout *layout = plot()->plotLayout();
bool showHScrollBar = needScrollBar(Qt::Horizontal);
if ( showHScrollBar )
{
ScrollBar *sb = scrollBar(Qt::Horizontal);
sb->setPalette(plot()->palette());
const QwtScaleEngine *se = plot()->axisScaleEngine(xAxis);
sb->setInverted(se->testAttribute(QwtScaleEngine::Inverted));
sb->setBase(zoomBase().left(), zoomBase().right());
sb->moveSlider(zoomRect().left(), zoomRect().right());
if ( !sb->isVisibleTo(canvas()) )
{
sb->show();
layout->setCanvasMargin(layout->canvasMargin(xScrollBarAxis)
+ sb->extent(), xScrollBarAxis);
}
}
else
{
if ( horizontalScrollBar() )
{
horizontalScrollBar()->hide();
layout->setCanvasMargin(layout->canvasMargin(xScrollBarAxis)
- horizontalScrollBar()->extent(), xScrollBarAxis);
}
}
bool showVScrollBar = needScrollBar(Qt::Vertical);
if ( showVScrollBar )
{
ScrollBar *sb = scrollBar(Qt::Vertical);
sb->setPalette(plot()->palette());
const QwtScaleEngine *se = plot()->axisScaleEngine(xAxis);
sb->setInverted(!(se->testAttribute(QwtScaleEngine::Inverted)));
sb->setBase(zoomBase().top(), zoomBase().bottom());
sb->moveSlider(zoomRect().top(), zoomRect().bottom());
if ( !sb->isVisibleTo(canvas()) )
{
sb->show();
layout->setCanvasMargin(layout->canvasMargin(yScrollBarAxis)
+ sb->extent(), yScrollBarAxis);
}
}
else
{
if ( verticalScrollBar() )
{
verticalScrollBar()->hide();
layout->setCanvasMargin(layout->canvasMargin(yScrollBarAxis)
- verticalScrollBar()->extent(), yScrollBarAxis);
}
}
if ( showHScrollBar && showVScrollBar )
{
if ( d_cornerWidget == NULL )
{
d_cornerWidget = new QWidget(canvas());
#if QT_VERSION >= 0x040100
d_cornerWidget->setAutoFillBackground(true);
#endif
d_cornerWidget->setPalette(plot()->palette());
}
d_cornerWidget->show();
}
else
{
if ( d_cornerWidget )
d_cornerWidget->hide();
}
layoutScrollBars(((QwtPlotCanvas *)canvas())->contentsRect());
plot()->updateLayout();
}
/*!
Constructs a QAccessibleScrollBar object for \a w.
\a name is propagated to the QAccessibleWidgetEx constructor.
*/
QAccessibleScrollBar::QAccessibleScrollBar(QWidget *w)
: QAccessibleAbstractSlider(w, ScrollBar)
{
Q_ASSERT(scrollBar());
addControllingSignal(QLatin1String("valueChanged(int)"));
}
/*! \reimp */
int QAccessibleScrollBar::childCount() const
{
if (!scrollBar()->isVisible())
return 0;
return LineDown;
}
QString QAccessibleScrollBar::text(QAccessible::Text t) const
{
if (t == QAccessible::Value)
return QString::number(scrollBar()->value());
return QAccessibleAbstractSlider::text(t);
}
