/// <summary>
/// Event handler called when the mouse is moved. Asks each control to
/// check its mouse status (whether the mouse is over or not). Control
/// invokes the MouseOut event, while this method invokes the MouseOver
/// event.
/// </summary>
/// <param name="args">Mouse event arguments.</param>
private void CheckMouseStatus(MouseEventArgs args)
{
UIComponent result = null;
// Ask each control to checks its mouse status
foreach (UIComponent control in this.controls)
{
// Early out if any control is animating (moving or resizing)
if (control.IsAnimating)
{
return;
}
UIComponent temp = control.CheckMouseStatus(args);
// When modal, only allow modal control, its children, and null through
if (temp != null && (this.modalControl == null || this.modalControl.IsChild(temp)))
{
// MouseOut last result
if (result != null && result.IsMouseOver)
{
result.InvokeMouseOut(args);
}
result = temp;
}
}
if (result != null)
{
// Indirectly invoke MouseOver event
if (!result.IsMouseOver)
{
result.InvokeMouseOver(args);
}
}
}
/// <summary>
/// Asks children for their mouse status, and invokes MouseOut event
/// for this control if necessary.
/// </summary>
/// <param name="args">Mouse event arguments.</param>
/// <returns>Control asking for MouseOver event, otherwise null.</returns>
internal UIComponent CheckMouseStatus(MouseEventArgs args)
{
UIComponent result = null;
// Check if control can receive MouseOver and MouseOut events
if (this.Visible)
{
// Check if MouseOut event should be invoked
bool mouseOver = CheckCoordinates(args.Position.X, args.Position.Y);
if (this.isMouseOver)
{
if (!mouseOver)
{
this.isMouseOver = false;
MouseOut.Invoke(args);
}
}
if (mouseOver)
{
float zTemp = 0.0f;
// Ask each child to check its mouse status
foreach (UIComponent control in this.controls)
{
// Keep track of highest z-order
if (control.ZOrder >= zTemp)
{
UIComponent child = control.CheckMouseStatus(args);
if (child != null)
{
// MouseOut last result
if (result != null && result.IsMouseOver)
{
result.InvokeMouseOut(args);
}
// Set result and update highest z-order
result = child;
zTemp = control.ZOrder;
}
}
}
// If no child requires the event, see if this control can
// take it.
if (result == null && this.canHaveFocus)
{
result = this;
}
}
else
{
// Ensure each control can receive MouseOut event
foreach (UIComponent control in this.controls)
{
control.CheckMouseStatus(args);
}
}
}
return(result);
}