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Add navigation tool to scroll image by pressing-and-moving mouse over the image.

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Luis Lucas committed 2014-04-03 04:01:31 +01:00
1 parent 850b48771e
commit 7476093974
4 files changed
+46 -20
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source/app/SubWindowHandle.cpp
+12 -2
View File
@@ -43,7 +43,8 @@ SubWindowHandle::SubWindowHandle( QWidget * parent ) :
// Create a new interface to show images
m_cViewArea = new ViewArea( this );
connect( m_cViewArea, SIGNAL( zoomFactorChanged(double) ), this, SLOT( adjustScrollBar(double) ) );
connect( m_cViewArea, SIGNAL( zoomFactorChanged( double ) ), this, SLOT( adjustScrollBarByZoom(double) ) );
connect( m_cViewArea, SIGNAL( moveScroll( QPoint ) ), this, SLOT( adjustScrollBarByOffset(QPoint) ) );
// Define the cViewArea as the widget inside the scroll area
m_cScrollArea->setWidget( m_cViewArea );
@@ -268,7 +269,15 @@ Void SubWindowHandle::scaleView( const QSize & size )
scaleView( hfactor );
}
void SubWindowHandle::adjustScrollBar( double factor )
void SubWindowHandle::adjustScrollBarByOffset( QPoint Offset )
{
QScrollBar *scrollBar = m_cScrollArea->horizontalScrollBar();
scrollBar->setValue( int( scrollBar->value() + Offset.x() ) );
scrollBar = m_cScrollArea->verticalScrollBar();
scrollBar->setValue( int( scrollBar->value() + Offset.y() ) );
}
void SubWindowHandle::adjustScrollBarByZoom( double factor )
{
QScrollBar *scrollBar = m_cScrollArea->horizontalScrollBar();
scrollBar->setValue( int( factor * scrollBar->value() + ( ( factor - 1 ) * scrollBar->pageStep() / 2 ) ) );
@@ -276,6 +285,7 @@ void SubWindowHandle::adjustScrollBar( double factor )
scrollBar->setValue( int( factor * scrollBar->value() + ( ( factor - 1 ) * scrollBar->pageStep() / 2 ) ) );
}
QSize SubWindowHandle::sizeHint() const
{
QSize maxSize; // The size of the parent (viewport widget