void ScrollZoomer::layoutScrollBars(const QRect &rect) {
int hPos = xAxis();
if (hScrollBarPosition() == OppositeToScale) hPos = oppositeAxis(hPos);
int vPos = yAxis();
if (vScrollBarPosition() == OppositeToScale) vPos = oppositeAxis(vPos);
ScrollBar *hScrollBar = horizontalScrollBar();
ScrollBar *vScrollBar = verticalScrollBar();
const int hdim = hScrollBar ? hScrollBar->extent() : 0;
const int vdim = vScrollBar ? vScrollBar->extent() : 0;
if (hScrollBar && hScrollBar->isVisible())
{
int x = rect.x();
int y = (hPos == QwtPlot::xTop) ? rect.top() : rect.bottom() - hdim + 1;
int w = rect.width();
if (vScrollBar && vScrollBar->isVisible())
{
if (vPos == QwtPlot::yLeft)
x += vdim;
w -= vdim;
}
hScrollBar->setGeometry(x, y, w, hdim);
}
if (vScrollBar && vScrollBar->isVisible())
{
int pos = yAxis();
if (vScrollBarPosition() == OppositeToScale)
pos = oppositeAxis(pos);
int x = (vPos == QwtPlot::yLeft) ? rect.left() : rect.right() - vdim + 1;
int y = rect.y();
int h = rect.height();
if (hScrollBar && hScrollBar->isVisible())
{
if (hPos == QwtPlot::xTop)
y += hdim;
h -= hdim;
}
vScrollBar->setGeometry(x, y, vdim, h);
}
if (hScrollBar && hScrollBar->isVisible() && vScrollBar
&& vScrollBar->isVisible())
{
if (d_cornerWidget)
{
QRect cornerRect(vScrollBar->pos().x(), hScrollBar->pos().y(), vdim,
hdim);
d_cornerWidget->setGeometry(cornerRect);
}
}
}
void ScrollZoomer::updateScrollBars()
{
if ( !canvas() )
return;
const int xAxis = QwtPlotZoomer::xAxis().pos;
const int yAxis = QwtPlotZoomer::yAxis().pos;
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() );
sb->setInverted( !plot()->axisScaleDiv( xAxis ).isIncreasing() );
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() );
sb->setInverted( !plot()->axisScaleDiv( yAxis ).isIncreasing() );
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() );
d_cornerWidget->setAutoFillBackground( true );
d_cornerWidget->setPalette( plot()->palette() );
}
d_cornerWidget->show();
}
else
{
if ( d_cornerWidget )
d_cornerWidget->hide();
}
layoutScrollBars( canvas()->contentsRect() );
plot()->updateLayout();
}