Preventing Scrollbars from Moving When Clicking on the ScrollablePanel
Environment
| Product Version | Product | Author |
|---|---|---|
| 2024.3.806 | RadGridView for WinForms | Dinko Krastev |
Description
When clicking on the content of the RadScrollablePanel, the scrollbars automatically move to make the focused control visible. This behavior is due to the RadScrollablePanel automatically scrolling to the active control. The goal is to disable this automatic scrolling behavior so that the scrollbars do not move when a window is clicked.
Solution
To prevent the scrollbars from moving when clicking on a window, you need to override the ScrollToControl method of the RadScrollablePanelContainer. This involves creating a custom class that derives from RadScrollablePanelContainer and then using this custom container in your RadScrollablePanel.
First, create a custom RadScrollablePanelContainer:
public class MyRadScrollableContainer : RadScrollablePanelContainer
{
private RadScrollablePanel myParentPanel;
public MyRadScrollableContainer() : base(null)
{
}
public MyRadScrollableContainer(RadScrollablePanel parentPanel) : base(parentPanel)
{
this.DoubleBuffered = true;
this.SetStyle(ControlStyles.Selectable, true);
this.myParentPanel = parentPanel;
}
protected override Point ScrollToControl(Control activeControl)
{
Point result = Point.Empty;
if (myParentPanel != null)
{
result = new Point(-this.myParentPanel.HorizontalScrollbar.Value, -this.myParentPanel.VerticalScrollbar.Value);
}
return result;
}
}
Then, create a custom RadScrollablePanel that uses your custom container:
public class CustomRadScrollablePanel : RadScrollablePanel
{
protected override RadScrollablePanelContainer CreateScrollablePanelContainer()
{
return new MyRadScrollableContainer(this);
}
public override string ThemeClassName
{
get
{
return typeof(RadScrollablePanel).FullName;
}
}
}
Finally, replace the default RadScrollablePanel with your custom version in the applicable part of your application, such as the OnWindowCreate() method.
By implementing this custom container, you disable the default behavior that automatically scrolls to the active control, thus preventing the scrollbars from moving when a window is clicked.