How to add the ability to zoom a WPF control and content?
We must nest the control or controls that we want to zoom simultaneously in one Grid
, on which we apply a transformation Layout type transformation scale.
For example :
<ScrollViewer HorizontalScrollBarVisibility="Visible" VerticalScrollBarVisibility="Visible" > <Grid Name="ZoomableContentGrid" RenderTransformOrigin="0.5,0.5"> <Grid.LayoutTransform> <TransformGroup> <ScaleTransform x:Name="GridScaleTransform"/> </TransformGroup> </Grid.LayoutTransform> <!-- le contenu zoomé se place ici ... --> </Grid> </ScrollViewer>
the following C # method will apply the desired zoom ratio (between 0 and 1 inclusive):
void SetZoom( // facteur de zoom entre 0 et 1 compris double zoomFactor) { GridScaleTransform.ScaleX = zoomFactor; GridScaleTransform.ScaleY = zoomFactor; }
This method can be linked to control events such as selecting a drop-down list, entering a text box or changing the value of a slider …
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