R – Winforms MDI “Desktop” Area Boundry

mdimdichildmdiparentvb.netwinforms

The default MDI parent control has a large "desktop" area that can display multiple child forms. Users can drag forms to the edge of this desktop area so that most of the child form is off the screen. (A scroll bar then appears in the MDI parent) I don't like this feature. Is there a way to lock down the edge of the desktop area so that the child forms remain fully visible?

Best Answer

Disable the MDI window scrollbars
Hook the OnMove event of all child windows. If the window is moved outside the boundary, "pop" it back along the x and y until it is back inside the parent.

Related Solutions

Winforms – Size/Location of Winforms MDI Client Area

There is no property on a form that gives you access to the MDI client window. But you can find it back like this:

public MdiClient GetMdiClientWindow() {
  foreach (Control ctl in this.Controls) {
    if (ctl is MdiClient) return ctl as MdiClient;
  }
  return null;
}

From there, just use its Size property.

R – How to use MouseWheel to scroll MDI parent window in Winforms app

Once you capture the mousewheel event, simply call SetDisplayRectLocation() of the control being scrolled. Something like

myControl.SetDisplayRectLocation(
            myControl.DisplayRectangle.X, 
            myControl.DisplayRectangle.Y + MouseWheelDelta * ScrollAmount
          );

(ScrollAmount is a constant you define -- start with 30 pixels).

You also need to call AdjustFormScrollbars() on the main form as well to update the scroll bar location.

(Sorry, that's C# -- I don't know VB syntax)

Best Answer

Related Solutions

Winforms – Size/Location of Winforms MDI Client Area

R – How to use MouseWheel to scroll MDI parent window in Winforms app

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