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Do wheel zoom relative to mouse position.

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This commit is contained in:
Luis Lucas committed 2014-04-05 04:49:10 +01:00
1 parent 5dcfce6db7
commit b2ccbfe820
4 files changed
+47 -11
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source/app/SubWindowHandle.cpp
+39 -5
View File
@@ -43,7 +43,7 @@ SubWindowHandle::SubWindowHandle( QWidget * parent ) :
// Create a new interface to show images
m_cViewArea = new ViewArea( this );
connect( m_cViewArea, SIGNAL( zoomFactorChanged( double ) ), this, SLOT( adjustScrollBarByZoom(double) ) );
connect( m_cViewArea, SIGNAL( zoomFactorChanged( double , QPoint) ), this, SLOT( adjustScrollBarByZoom(double, QPoint) ) );
connect( m_cViewArea, SIGNAL( moveScroll( QPoint ) ), this, SLOT( adjustScrollBarByOffset(QPoint) ) );
// Define the cViewArea as the widget inside the scroll area
@@ -56,6 +56,7 @@ SubWindowHandle::SubWindowHandle( QWidget * parent ) :
m_cWindowName = QString( " " );
m_bIsPlaying = false;
m_cLastScroll = QPoint();
}
SubWindowHandle::~SubWindowHandle()
@@ -243,7 +244,7 @@ Void SubWindowHandle::zoomToFit()
Void SubWindowHandle::scaleViewFactor( Double factor )
{
Q_ASSERT( m_cViewArea->image() );
m_cViewArea->zoomChangeEvent( factor );
m_cViewArea->zoomChangeEvent( factor , QPoint() );
}
Void SubWindowHandle::scaleView( Double scale )
@@ -280,16 +281,49 @@ void SubWindowHandle::adjustScrollBarByOffset( QPoint Offset )
{
QScrollBar *scrollBar = m_cScrollArea->horizontalScrollBar();
scrollBar->setValue( int( scrollBar->value() + Offset.x() ) );
m_cLastScroll.setX( scrollBar->value() );
scrollBar = m_cScrollArea->verticalScrollBar();
scrollBar->setValue( int( scrollBar->value() + Offset.y() ) );
m_cLastScroll.setY( scrollBar->value() );
}
void SubWindowHandle::adjustScrollBarByZoom( double factor )
// This function was developed with help of the schematics presented in
// http://stackoverflow.com/questions/13155382/jscrollpane-zoom-relative-to-mouse-position
void SubWindowHandle::adjustScrollBarByZoom( double factor , QPoint center )
{
QScrollBar *scrollBar = m_cScrollArea->horizontalScrollBar();
scrollBar->setValue( int( factor * scrollBar->value() + ( ( factor - 1 ) * scrollBar->pageStep() / 2 ) ) );
if( center.isNull() )
{
scrollBar->setValue( int( factor * scrollBar->value() + ( ( factor - 1 ) * scrollBar->pageStep() / 2 ) ) );
}
else
{
Int x = center.x() - m_cLastScroll.x();
Int value = int( factor * m_cLastScroll.x() + ( ( factor - 1 ) * x ) );
if ( value > scrollBar->maximum() )
value = scrollBar->maximum();
if ( value < scrollBar->minimum() )
value = scrollBar->minimum();
scrollBar->setValue( value );
m_cLastScroll.setX( value );
}
scrollBar = m_cScrollArea->verticalScrollBar();
scrollBar->setValue( int( factor * scrollBar->value() + ( ( factor - 1 ) * scrollBar->pageStep() / 2 ) ) );
if( center.isNull() )
{
scrollBar->setValue( int( factor * scrollBar->value() + ( ( factor - 1 ) * scrollBar->pageStep() / 2 ) ) );
}
else
{
Int y = center.y() - m_cLastScroll.y();
Int value = int( factor * m_cLastScroll.y() + ( ( factor - 1 ) * y ) );
if ( value > scrollBar->maximum() )
value = scrollBar->maximum();
if ( value < scrollBar->minimum() )
value = scrollBar->minimum();
scrollBar->setValue( value );
m_cLastScroll.setY( value );
}
}