/// <summary>
/// <para>Determine if two regions are equal.</para>
/// </summary>
///
/// <param name="obj">
/// <para>The region object to compare against.</para>
/// </param>
///
/// <returns>
/// <para>Returns <see langword="true"/> if the two regions are equal;
/// <see langword="false"/> otherwise. For the purposes of this
/// method, disposed regions are considered the same as empty
/// regions.</para>
/// </returns>
public override bool Equals(Object obj)
{
lock (typeof(Region))
{
Region other = (obj as Region);
if (other != null)
{
if (this == other)
{
return(true);
}
else if (IsEmpty())
{
return(other.IsEmpty());
}
else if (other.IsEmpty())
{
return(false);
}
else
{
return(Xlib.XEqualRegion
(region, other.region) != 0);
}
}
else
{
return(false);
}
}
}
// Clear a region to the background and optionally queue expose events.
private bool ClearRegion(Region region, XBool exposures)
{
// Intersect the region with the widget boundaries.
region.Intersect(0, 0, width, height);
// Remove areas that are occupied by mapped child widgets.
Widget child = TopChild;
while (child != null)
{
if (child.mapped)
{
region.Subtract(child.x, child.y,
child.width, child.height);
}
child = child.NextBelow;
}
// Bail out if the region is now empty.
if (region.IsEmpty())
{
return(false);
}
// Lock down the display and send the "XClearArea" requests.
try
{
IntPtr display = dpy.Lock();
XWindow handle = GetWidgetHandle();
IntPtr xregion = region.GetRegion();
XRectangle xrect;
int size, index;
size = Xlib.XSharpGetRegionSize(xregion);
for (index = 0; index < size; ++index)
{
Xlib.XSharpGetRegionRect(xregion, index, out xrect);
Xlib.XClearArea(display, handle, xrect.x, xrect.y,
xrect.width, xrect.height, exposures);
}
}
finally
{
dpy.Unlock();
}
return(true);
}
// Clear a region to the background and optionally queue expose events.
private bool ClearRegion(Region region, XBool exposures)
{
// Intersect the region with the widget boundaries.
region.Intersect(0, 0, width, height);
// Remove areas that are occupied by mapped child widgets.
Widget child = TopChild;
while(child != null)
{
if(child.mapped)
{
region.Subtract(child.x, child.y,
child.width, child.height);
}
child = child.NextBelow;
}
// Bail out if the region is now empty.
if(region.IsEmpty())
{
return false;
}
// Lock down the display and send the "XClearArea" requests.
try
{
IntPtr display = dpy.Lock();
XWindow handle = GetWidgetHandle();
IntPtr xregion = region.GetRegion();
XRectangle xrect;
int size, index;
size = Xlib.XSharpGetRegionSize(xregion);
for(index = 0; index < size; ++index)
{
Xlib.XSharpGetRegionRect(xregion, index, out xrect);
Xlib.XClearArea(display, handle, xrect.x, xrect.y,
xrect.width, xrect.height, exposures);
}
}
finally
{
dpy.Unlock();
}
return true;
}
