Hello. I previously reported a problem with drawing a rubberband and a
workaround was provided. I now find that I am unable to resize a
rubberband using a QRect which has been modified using setLeft etc.
Please see the attached files. The C++ version works whereas the Python
version does not.
// g++ -o rubberband2 rubberband2.cpp -I /usr/include/qt4/ -lQtCore -lQtGui
# include <QtCore/QtCore>
# include <QtGui/QtGui>
class rubberBandWidget : public QWidget
{
public :
rubberBandWidget ( QWidget * parent = 0 ) ;
protected :
void mousePressEvent ( QMouseEvent * event ) ;
void mouseMoveEvent ( QMouseEvent * event ) ;
void mouseReleaseEvent ( QMouseEvent * event ) ;
private :
QRubberBand * rubberBand ;
bool tweaking ;
QPoint origin ;
QString tweakingpart ;
QPoint tl, tr, bl, br ;
} ;
rubberBandWidget :: rubberBandWidget ( QWidget * parent ) : QWidget ( parent )
{
rubberBand = new QRubberBand ( QRubberBand :: Rectangle, this ) ;
tweaking = false ;
}
void rubberBandWidget :: mousePressEvent ( QMouseEvent * event )
{
QPoint pt = event -> pos () ;
QRect rg = rubberBand -> geometry () ;
if ( rg . isValid () )
{
tl = rg . topLeft () ; tr = rg . topRight () ; bl = rg . bottomLeft () ; br = rg . bottomRight () ;
const QPoint off ( 3, 3 ), offx ( 4, -3 ), offy ( -3, 4 ) ;
if ( QRect ( tl - off , tl + off ) . contains ( pt ) )
{ tweakingpart = "topLeft" ; this -> setCursor ( Qt :: SizeFDiagCursor ) ; }
else if ( QRect ( tr - off , tr + off ) . contains ( pt ) )
{ tweakingpart = "topRight" ; this -> setCursor ( Qt :: SizeBDiagCursor ) ; }
else if ( QRect ( bl - off , bl + off ) . contains ( pt ) )
{ tweakingpart = "bottomLeft" ; this -> setCursor ( Qt :: SizeBDiagCursor ) ; }
else if ( QRect ( br - off , br + off ) . contains ( pt ) )
{ tweakingpart = "bottomRight" ; this -> setCursor ( Qt :: SizeFDiagCursor ) ; }
else if ( QRect ( tl + offx, tr - offx ) . contains ( pt ) )
{ tweakingpart = "top" ; this -> setCursor ( Qt :: SizeVerCursor ) ; }
else if ( QRect ( bl + offx, br - offx ) . contains ( pt ) )
{ tweakingpart = "bottom" ; this -> setCursor ( Qt :: SizeVerCursor ) ; }
else if ( QRect ( tl + offy, bl - offy ) . contains ( pt ) )
{ tweakingpart = "left" ; this -> setCursor ( Qt :: SizeHorCursor ) ; }
else if ( QRect ( tr + offy, br - offy ) . contains ( pt ) )
{ tweakingpart = "right" ; this -> setCursor ( Qt :: SizeHorCursor ) ; }
if ( tweakingpart != "" )
{
tweaking = true ;
return ;
}
}
origin = pt ;
rubberBand -> setGeometry ( QRect ( origin, QSize () ) ) ;
rubberBand -> show () ;
}
void rubberBandWidget :: mouseMoveEvent ( QMouseEvent * event )
{
QPoint pt = event -> pos () ;
if ( tweaking )
{
QRect rg = rubberBand -> geometry () ;
if ( tweakingpart == "topLeft" ) rg . setTopLeft ( pt ) ;
else if ( tweakingpart == "topRight" ) rg . setTopRight ( pt ) ;
else if ( tweakingpart == "bottomLeft" ) rg . setBottomLeft ( pt ) ;
else if ( tweakingpart == "bottomRight" ) rg . setBottomRight ( pt ) ;
else if ( tweakingpart == "top" ) rg . setTop ( pt . y () ) ;
else if ( tweakingpart == "bottom" ) rg . setBottom ( pt . y () ) ;
else if ( tweakingpart == "left" ) rg . setLeft ( pt . x () ) ;
else if ( tweakingpart == "right" ) rg . setRight ( pt . x () ) ;
rubberBand -> setGeometry ( rg ) ;
}
else
{
rubberBand -> setGeometry ( QRect ( origin, pt ) . normalized () ) ;
}
}
void rubberBandWidget :: mouseReleaseEvent ( QMouseEvent * event )
{
tweaking = false ;
tweakingpart = "" ;
this -> unsetCursor () ;
}
int main ( int argc, char * argv [] )
{
QApplication app ( argc, argv ) ;
rubberBandWidget * widget = new rubberBandWidget ;
widget -> setGeometry ( 300, 300, 300, 300 ) ;
widget -> show () ;
return app . exec () ;
}
#! /usr/bin/env python
import sys
from PyQt4 . QtCore import *
from PyQt4 . QtGui import *
class rubberBandWidget ( QWidget ) :
def __init__ ( self, parent = None ) :
QWidget . __init__ ( self, parent )
self . rubberBand = QRubberBand ( QRubberBand . Rectangle, self )
self . tweaking = False
self . tweakingpart = ""
def mousePressEvent ( self, event ) :
pt = self . mapFromGlobal ( event . globalPos () )
rg = self . rubberBand . geometry ()
if rg . isValid () :
tl, tr, bl, br = rg . topLeft (), rg . topRight (), rg . bottomLeft (), rg . bottomRight ()
off, offx, offy = QPoint ( 3, 3 ), QPoint ( 4, -3 ), QPoint ( -3, 4 )
if QRect ( tl - off , tl + off ) . contains ( pt ) :
self . tweakingpart = "topLeft" ; self . setCursor ( Qt . SizeFDiagCursor )
elif QRect ( tr - off , tr + off ) . contains ( pt ) :
self . tweakingpart = "topRight" ; self . setCursor ( Qt . SizeBDiagCursor )
elif QRect ( bl - off , bl + off ) . contains ( pt ) :
self . tweakingpart = "bottomLeft" ; self . setCursor ( Qt . SizeBDiagCursor )
elif QRect ( br - off , br + off ) . contains ( pt ) :
self . tweakingpart = "bottomRight" ; self . setCursor ( Qt . SizeFDiagCursor )
elif QRect ( tl + offx, tr - offx ) . contains ( pt ) :
self . tweakingpart = "top" ; self . setCursor ( Qt . SizeVerCursor )
elif QRect ( bl + offx, br - offx ) . contains ( pt ) :
self . tweakingpart = "bottom" ; self . setCursor ( Qt . SizeVerCursor )
elif QRect ( tl + offy, bl - offy ) . contains ( pt ) :
self . tweakingpart = "left" ; self . setCursor ( Qt . SizeHorCursor )
elif QRect ( tr + offy, br - offy ) . contains ( pt ) :
self . tweakingpart = "right" ; self . setCursor ( Qt . SizeHorCursor )
if self . tweakingpart != "" :
self . tweaking = True
return
self . origin = pt
self . rubberBand . setGeometry ( QRect ( self . origin, QSize () ) )
self . rubberBand . show ()
def mouseMoveEvent ( self, event ) :
pt = self . mapFromGlobal ( event . globalPos () )
if self . tweaking :
rg = self . rubberBand . geometry ()
if self . tweakingpart == "topLeft" : rg . setTopLeft ( pt )
elif self . tweakingpart == "topRight" : rg . setTopRight ( pt )
elif self . tweakingpart == "bottomLeft" : rg . setBottomLeft ( pt )
elif self . tweakingpart == "bottomRight" : rg . setBottomRight ( pt )
elif self . tweakingpart == "top" : rg . setTop ( pt . y () )
elif self . tweakingpart == "bottom" : rg . setBottom ( pt . y () )
elif self . tweakingpart == "left" : rg . setLeft ( pt . x () )
elif self . tweakingpart == "right" : rg . setRight ( pt . x () )
self . rubberBand . setGeometry ( rg )
else :
self . rubberBand . setGeometry ( QRect ( self . origin, pt ) . normalized () )
def mouseReleaseEvent ( self, event ) :
self . tweaking = False
self . tweakingpart = ""
self . unsetCursor ()
app = QApplication ( sys . argv )
widget = rubberBandWidget ()
widget . setGeometry ( 300, 300, 300, 300 )
widget . show ()
app . exec_ ()
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