internal void Dispose(bool disposing)
{
bool deletedHandle = false;
if (ownHandle)
{
if (!ownedByCacheManager || !disposing)
{
// If we were ever owned by the CacheManger and we're being disposed
// we can be sure that we're not in use by any DC's (otherwise Dispose() wouldn't have been called)
// skip the check IsFontInUse check in this case.
// Also skip the check if disposing == false, because the cache is thread-static
// and that means we're being called from the finalizer.
if (everOwnedByCacheManager || !disposing || !DeviceContexts.IsFontInUse(this))
{
Debug.Assert(hFont != IntPtr.Zero, "Unexpected null hFont.");
DbgUtil.AssertFinalization(this, disposing);
IntUnsafeNativeMethods.DeleteObject(new HandleRef(this, hFont));
#if TRACK_HFONT
Debug.WriteLine(DbgUtil.StackTraceToStr(String.Format("DeleteObject(HFONT[0x{0:x8}]))", (int)this.hFont)));
#endif
hFont = IntPtr.Zero;
ownHandle = false;
deletedHandle = true;
}
}
}
if (disposing && (deletedHandle || !ownHandle))
{
GC.SuppressFinalize(this);
}
}
/// <devdoc>
/// </devdoc>
public void Dispose(bool disposing)
{
if (this.nativeHandle != IntPtr.Zero)
{
DbgUtil.AssertFinalization(this, disposing);
if (this.ownHandle)
{
IntUnsafeNativeMethods.DeleteObject(new HandleRef(this, this.nativeHandle));
}
this.nativeHandle = IntPtr.Zero;
if (disposing)
{
GC.SuppressFinalize(this);
}
}
}
public void DeleteObject(IntPtr handle, GdiObjectType type)
{
IntPtr handleToDelete = IntPtr.Zero;
switch (type)
{
case GdiObjectType.Pen:
if (handle == hCurrentPen)
{
IntPtr currentPen = IntUnsafeNativeMethods.SelectObject(new HandleRef(this, this.Hdc), new HandleRef(this, hInitialPen));
Debug.Assert(currentPen == hCurrentPen, "DeviceContext thinks a different pen is selected than the HDC");
hCurrentPen = IntPtr.Zero;
}
handleToDelete = handle;
break;
case GdiObjectType.Brush:
if (handle == hCurrentBrush)
{
IntPtr currentBrush = IntUnsafeNativeMethods.SelectObject(new HandleRef(this, this.Hdc), new HandleRef(this, hInitialBrush));
Debug.Assert(currentBrush == hCurrentBrush, "DeviceContext thinks a different brush is selected than the HDC");
hCurrentBrush = IntPtr.Zero;
}
handleToDelete = handle;
break;
case GdiObjectType.Bitmap:
if (handle == hCurrentBmp)
{
IntPtr currentBmp = IntUnsafeNativeMethods.SelectObject(new HandleRef(this, this.Hdc), new HandleRef(this, hInitialBmp));
Debug.Assert(currentBmp == hCurrentBmp, "DeviceContext thinks a different brush is selected than the HDC");
hCurrentBmp = IntPtr.Zero;
}
handleToDelete = handle;
break;
}
IntUnsafeNativeMethods.DeleteObject(new HandleRef(this, handleToDelete));
}
