QwtPlotZoomer always generat signal zoomed

[atrofimov]

In function
void QwtPlotZoomer::zoom( int offset )
{
if ( offset == 0 )
d_data->zoomRectIndex = 0;
else
{
int newIndex = d_data->zoomRectIndex + offset;
newIndex = qMax( 0, newIndex );
newIndex = qMin( int( d_data->zoomStack.count() ) - 1, newIndex );

d_data->zoomRectIndex = uint( newIndex );
}

rescale();

Q_EMIT zoomed( zoomRect() );
}

need to generate |zoomed| and to call |rescale| only if value of |d_data->zoomRectIndex| is changed
???

[Uwe]

True - I fixed this SVN trunk.

Uwe

[atrofimov]

True - I fixed this SVN trunk.

Uwe

Why not fixed on a branch qwt-6.1? Is the current stable branch

[Uwe]

Why not fixed on a branch qwt-6.1? Is the current stable branch

Because it might break applications in a way you would not expect from a "compatible" version and the signal is a sensible thing. Sending an unnecessary signal is of course not correct - but not totally wrong.

But maybe you can also go with the QwtScaleWidget::scaleDivChanged() signals. Those indicate any change of the axes ( regardless of being initiated from the zoomer or something else ) and are often the better approach anyway.

Uwe

[atrofimov]

Any signal has to work only if value changed