How to set the horizontal scroll mouse wheel movement dependency?

[Psyduck]

Hello.

I am using RadImageEditor.

I'm done with the setup. It actually works too.

But when I shift + wheel, not only horizontal movement but also vertical scrolling.

I want to move only horizontal scrolling when shift is pressed.

Which part should I control?

<telerik:RadImageEditor x:Name="xImageEditor" Image="{Binding RadImage}" behaviour:HorizontalScrollViewerHelper.IsShiftWheelProperty="True" IsPanningEnabled="True"/>
<imageEditor:ZoomController ImageEditor="{Binding ElementName=xImageEditor}" HorizontalAlignment="Right" VerticalAlignment="Bottom"/>

public static class HorizontalScrollViewerHelper
    {
        public static bool GetIsShiftWheelProperty(DependencyObject obj) => (bool)obj.GetValue(IsShiftWheelProperty);
        public static void SetIsShiftWheelProperty(DependencyObject obj, bool value) => obj.SetValue(IsShiftWheelProperty, value);

        public static readonly DependencyProperty IsShiftWheelProperty
            = DependencyProperty.RegisterAttached("IsShiftWheel",
                typeof(bool),
                typeof(HorizontalScrollViewerHelper),
                new PropertyMetadata(false, HorizontalScrollCallback));

        private static void HorizontalScrollCallback(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            var imageEditor = d as RadImageEditor;
            imageEditor.PreviewMouseWheel += ImageEditor_PreviewMouseWheel;
        }

        private static void ImageEditor_PreviewMouseWheel(object sender, MouseWheelEventArgs e)
        {
            if (((RadImageEditor)sender).ChildrenOfType<ScrollViewer>().FirstOrDefault() is ScrollViewer scrollViewer)
            {
                if(Keyboard.Modifiers.Equals(ModifierKeys.Shift))
                {
                    if (e.Delta < 0)
                    {
                        scrollViewer.LineRight();
                    }
                    else
                    {
                        scrollViewer.LineLeft();
                    }
                    //scrollViewer.ScrollToHorizontalOffset(scrollViewer.HorizontalOffset + (-e.Delta / 300));
                }
            }
        }
    }

 

Thanks.

 

[Psyduck]

Is there any shift wheel feature provided by Telerik? Visual studio xaml shift wheel function.

[Martin Ivanov]

Hello KIM,

Currently, the custom code in the HorizontalScrollViewerHelper class is using the LineRight() and LineLeft() methods of the ScrollViewer. This will move the horizontal scrollbar. If you want to update the only the vertical scrolling, you can use the LineUp() and LineDown() methods instead. For example:

private static void ImageEditor_PreviewMouseWheel(object sender, MouseWheelEventArgs e)
{
	if (((RadImageEditor)sender).ChildrenOfType<ScrollViewer>().FirstOrDefault() is ScrollViewer scrollViewer)
	{
		if (Keyboard.Modifiers.Equals(ModifierKeys.Shift))
		{
			if (e.Delta < 0)
			{
				scrollViewer.LineUp();
			}
			else
			{
				scrollViewer.LineDown();
			}
		}
	}
}

I hope that helps.

Regards,
Martin Ivanov
Progress Telerik