/// <summary>
/// Gets the lightweight control that is located at the specified client point and allows
/// mouse wheel events.
/// </summary>
/// <param name="point">A point that contains the coordinates where you want to look for a
/// control. Coordinates are expressed relative to the upper-left corner of the control's
/// client area.</param>
/// <returns>The BehaviorControl at the specified client point that allows mouse wheel
/// events. If there is no BehaviorControl at the specified client point that allows
/// mouse wheel events, the GetBehaviorControlAtClientPoint method returns a null
/// reference.</returns>
private BehaviorControl GetMouseWheelBehaviorControlAtClientPoint(Point point)
{
// Map the client point to a virtual client point.
point = ClientPointToVirtualClientPoint(point);
// Enumerate the lightweight controls, in Z order, to locate one at the virtual point.
for (int index = Controls.Count - 1; index >= 0; index--)
{
// Access the lightweight control.
BehaviorControl BehaviorControl = Controls[index];
// If the lightweight control is visible, and the virtual client point is inside
// it, translate the virtual client point to be relative to the location of the
// lightweight control and recursively ask the lightweight control to return the
// lightweight control at the virtual client point that supports mouse wheel
// events. This will find the innermost lightweight control, at the top of the
// Z order that contains the virual client point and supports mouse wheel events.
if (BehaviorControl.Visible && BehaviorControl.VirtualBounds.Contains(point))
{
// Translate the virtual point to be relative to the location of the lightweight control.
point.Offset(BehaviorControl.VirtualLocation.X * -1, BehaviorControl.VirtualLocation.Y * -1);
// Recursively get the lightweight control at the translated point that
// supports mouse wheel events.
return(BehaviorControl.GetMouseWheelBehaviorControlAtPoint(point));
}
}
// The client point is not inside any lightweight control that allows mouse wheel
// events.
return(null);
}
/// <summary>
/// Gets the Behavior control that is located at the specified point and allows mouse wheel events.
/// </summary>
/// <param name="point">A Point that contains the coordinates where you want to look for a control.
/// Coordinates are expressed relative to the upper-left corner of the control's client area.</param>
/// <returns>Behavior control at the specified point.</returns>
internal BehaviorControl GetMouseWheelBehaviorControlAtPoint(Point point)
{
// Enumerate the Behavior controls, in Z order, to locate one at the virtual point.
for (int index = Controls.Count - 1; index >= 0; index--)
{
// Access the Behavior control.
BehaviorControl BehaviorControl = Controls[index];
// If the Behavior control is visible, and the point is within its virtual
// bounds, then recursively call it sit is under the point.
if (BehaviorControl.Visible && BehaviorControl.VirtualBounds.Contains(point))
{
// Translate the point to be relative to the location of the Behavior control.
point.Offset(BehaviorControl.VirtualLocation.X * -1, BehaviorControl.VirtualLocation.Y * -1);
// Recursively search for the right mouse wheel Behavior control.
BehaviorControl childMouseWheelBehaviorControl = BehaviorControl.GetMouseWheelBehaviorControlAtPoint(point);
if (childMouseWheelBehaviorControl != null)
{
return(childMouseWheelBehaviorControl);
}
}
}
// The point is not inside a child Behavior control of this Behavior control
// that allows mouse wheel events. So it's inside this Behavior control. If this
// Behavior control allows mouse wheel events, return it. Otherwise, return null.
return(AllowMouseWheel ? this : null);
}