FrameworkElement.SizeChanged event not raised when resizing control with changing zoom level
I have a wpf user control, and I listen to the FrameworkElement.SizeChanged event. In OnSizeChanged I need to recalculate zoom and apply back on the control.
The overall task is to scale the content inside the user control when the control is resized.
public class PictureDisplay: Control
{
public PictureDisplay()
{
SizeChanged += OnSizeChanged;
}
private void OnSizeChanged(object sender, SizeChangedEventArgs e)
{
//Recalculate zoomValue with new control dimensions
if(zoomvalue changes)
ApplyZoom(zoomValue);
}
private ApplyZoom(double zoomValue)
{
ScaleTransform tf = (ScaleTransform)dc._image.LayoutTransform;
tf.ScaleX = zoomValue;
tf.ScaleY = zoomValue;
}
}
All resize operations need not result in a new zoomValue. Suppose I resized along the X-axis with a minimal offset, and let's say my custom calculation of zoomValue doesnt create a new zoomValue, I am able to resize the user control on UI and receive SizeChanged events.
But when resizing results in the creation of a new zoomvalue, and as soon as I apply the new zoomValue on the UI, then I am not able to resize the control on the UI and I no longer receive SizeChanged events. Though I drag the mouse to resize, it doesnt. If I release the mouse and do again I see the same behavior.
So, in one stretch of mouse operation sequence, upon new zoom level getting applied to the control, I cant resize the control further. If I release the mouse and try to resize I am able to, but only till newer zoom gets applied. With changing zoom levels of the content I am unable to drag and resize in a go. If I disable ApplyZoom function I can resize the control as expected.
This gives me a feeling the resize of the control itself is not working when the scale factor is modified.
What needs to be done to continuously/smoothly resize the control and render the content with updated scale factor?
c# wpf wpf-controls routed-events
asked Nov 14 '18 at 11:12
JogaJoga
9518
add a comment |
I have a wpf user control, and I listen to the FrameworkElement.SizeChanged event. In OnSizeChanged I need to recalculate zoom and apply back on the control.
The overall task is to scale the content inside the user control when the control is resized.
public class PictureDisplay: Control
{
public PictureDisplay()
{
SizeChanged += OnSizeChanged;
}
private void OnSizeChanged(object sender, SizeChangedEventArgs e)
{
//Recalculate zoomValue with new control dimensions
if(zoomvalue changes)
ApplyZoom(zoomValue);
}
private ApplyZoom(double zoomValue)
{
ScaleTransform tf = (ScaleTransform)dc._image.LayoutTransform;
tf.ScaleX = zoomValue;
tf.ScaleY = zoomValue;
}
}
All resize operations need not result in a new zoomValue. Suppose I resized along the X-axis with a minimal offset, and let's say my custom calculation of zoomValue doesnt create a new zoomValue, I am able to resize the user control on UI and receive SizeChanged events.
But when resizing results in the creation of a new zoomvalue, and as soon as I apply the new zoomValue on the UI, then I am not able to resize the control on the UI and I no longer receive SizeChanged events. Though I drag the mouse to resize, it doesnt. If I release the mouse and do again I see the same behavior.
So, in one stretch of mouse operation sequence, upon new zoom level getting applied to the control, I cant resize the control further. If I release the mouse and try to resize I am able to, but only till newer zoom gets applied. With changing zoom levels of the content I am unable to drag and resize in a go. If I disable ApplyZoom function I can resize the control as expected.
This gives me a feeling the resize of the control itself is not working when the scale factor is modified.
What needs to be done to continuously/smoothly resize the control and render the content with updated scale factor?
c# wpf wpf-controls routed-events
asked Nov 14 '18 at 11:12
JogaJoga
9518
add a comment |
I have a wpf user control, and I listen to the FrameworkElement.SizeChanged event. In OnSizeChanged I need to recalculate zoom and apply back on the control.
The overall task is to scale the content inside the user control when the control is resized.
public class PictureDisplay: Control
{
public PictureDisplay()
{
SizeChanged += OnSizeChanged;
}
private void OnSizeChanged(object sender, SizeChangedEventArgs e)
{
//Recalculate zoomValue with new control dimensions
if(zoomvalue changes)
ApplyZoom(zoomValue);
}
private ApplyZoom(double zoomValue)
{
ScaleTransform tf = (ScaleTransform)dc._image.LayoutTransform;
tf.ScaleX = zoomValue;
tf.ScaleY = zoomValue;
}
}
All resize operations need not result in a new zoomValue. Suppose I resized along the X-axis with a minimal offset, and let's say my custom calculation of zoomValue doesnt create a new zoomValue, I am able to resize the user control on UI and receive SizeChanged events.
But when resizing results in the creation of a new zoomvalue, and as soon as I apply the new zoomValue on the UI, then I am not able to resize the control on the UI and I no longer receive SizeChanged events. Though I drag the mouse to resize, it doesnt. If I release the mouse and do again I see the same behavior.
So, in one stretch of mouse operation sequence, upon new zoom level getting applied to the control, I cant resize the control further. If I release the mouse and try to resize I am able to, but only till newer zoom gets applied. With changing zoom levels of the content I am unable to drag and resize in a go. If I disable ApplyZoom function I can resize the control as expected.
This gives me a feeling the resize of the control itself is not working when the scale factor is modified.
What needs to be done to continuously/smoothly resize the control and render the content with updated scale factor?
c# wpf wpf-controls routed-events
asked Nov 14 '18 at 11:12
JogaJoga
9518
I have a wpf user control, and I listen to the FrameworkElement.SizeChanged event. In OnSizeChanged I need to recalculate zoom and apply back on the control.
The overall task is to scale the content inside the user control when the control is resized.
public class PictureDisplay: Control
{
public PictureDisplay()
{
SizeChanged += OnSizeChanged;
}
private void OnSizeChanged(object sender, SizeChangedEventArgs e)
{
//Recalculate zoomValue with new control dimensions
if(zoomvalue changes)
ApplyZoom(zoomValue);
}
private ApplyZoom(double zoomValue)
{
ScaleTransform tf = (ScaleTransform)dc._image.LayoutTransform;
tf.ScaleX = zoomValue;
tf.ScaleY = zoomValue;
}
}
All resize operations need not result in a new zoomValue. Suppose I resized along the X-axis with a minimal offset, and let's say my custom calculation of zoomValue doesnt create a new zoomValue, I am able to resize the user control on UI and receive SizeChanged events.
But when resizing results in the creation of a new zoomvalue, and as soon as I apply the new zoomValue on the UI, then I am not able to resize the control on the UI and I no longer receive SizeChanged events. Though I drag the mouse to resize, it doesnt. If I release the mouse and do again I see the same behavior.
So, in one stretch of mouse operation sequence, upon new zoom level getting applied to the control, I cant resize the control further. If I release the mouse and try to resize I am able to, but only till newer zoom gets applied. With changing zoom levels of the content I am unable to drag and resize in a go. If I disable ApplyZoom function I can resize the control as expected.
This gives me a feeling the resize of the control itself is not working when the scale factor is modified.
What needs to be done to continuously/smoothly resize the control and render the content with updated scale factor?
c# wpf wpf-controls routed-events
c# wpf wpf-controls routed-events
asked Nov 14 '18 at 11:12
JogaJoga
9518
asked Nov 14 '18 at 11:12
JogaJoga
9518
asked Nov 14 '18 at 11:12
JogaJoga
9518
asked Nov 14 '18 at 11:12
JogaJoga
9518
asked Nov 14 '18 at 11:12
JogaJoga
9518
9518
add a comment |
add a comment |
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