bool
ScrollZoomer::eventFilter(QObject* object, QEvent* event)
{
if (object == canvas()) {
switch (event->type()) {
case QEvent::Resize: {
int left, top, right, bottom;
canvas()->getContentsMargins(&left, &top, &right, &bottom);
QRect rect;
rect.setSize(static_cast<QResizeEvent*>(event)->size());
rect.adjust(left, top, -right, -bottom);
layoutScrollBars(rect);
break;
}
case QEvent::ChildRemoved: {
const QObject* child = static_cast<QChildEvent*>(event)->child();
if (child == d_cornerWidget)
d_cornerWidget = NULL;
else if (child == d_hScrollData->scrollBar)
d_hScrollData->scrollBar = NULL;
else if (child == d_vScrollData->scrollBar)
d_vScrollData->scrollBar = NULL;
break;
}
default:
break;
}
}
return QwtPlotZoomer::eventFilter(object, event);
}
bool ScrollZoomer::eventFilter(QObject *o, QEvent *e)
{
if (o == canvas())
{
switch (e->type())
{
case QEvent::Resize:
{
const int fw = ((QwtPlotCanvas *) canvas())->frameWidth();
QRect rect;
rect.setSize(((QResizeEvent *) e)->size());
rect.setRect(rect.x() + fw, rect.y() + fw, rect.width() - 2 * fw,
rect.height() - 2 * fw);
layoutScrollBars(rect);
break;
}
case QEvent::ChildRemoved:
{
const QObject *child = ((QChildEvent *) e)->child();
if (child == d_cornerWidget)
d_cornerWidget = NULL;
else if (child == d_hScrollData->scrollBar)
d_hScrollData->scrollBar = NULL;
else if (child == d_vScrollData->scrollBar)
d_vScrollData->scrollBar = NULL;
break;
}
default:
break;
}
}
return QwtPlotZoomer::eventFilter(o, e);
}
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();
}
