public void DeleteObject(IntPtr handle, GdiObjectType type)
{
IntPtr zero = IntPtr.Zero;
switch (type)
{
case GdiObjectType.Pen:
if (handle == this.hCurrentPen)
{
IntUnsafeNativeMethods.SelectObject(new HandleRef(this, this.Hdc), new HandleRef(this, this.hInitialPen));
this.hCurrentPen = IntPtr.Zero;
}
zero = handle;
break;
case GdiObjectType.Brush:
if (handle == this.hCurrentBrush)
{
IntUnsafeNativeMethods.SelectObject(new HandleRef(this, this.Hdc), new HandleRef(this, this.hInitialBrush));
this.hCurrentBrush = IntPtr.Zero;
}
zero = handle;
break;
case GdiObjectType.Bitmap:
if (handle == this.hCurrentBmp)
{
IntUnsafeNativeMethods.SelectObject(new HandleRef(this, this.Hdc), new HandleRef(this, this.hInitialBmp));
this.hCurrentBmp = IntPtr.Zero;
}
zero = handle;
break;
}
IntUnsafeNativeMethods.DeleteObject(new HandleRef(this, zero));
}
public void DeleteObject(IntPtr handle, GdiObjectType type)
{
IntPtr handleToDelete = IntPtr.Zero;
switch (type)
{
case GdiObjectType.Pen:
if (handle == hCurrentPen)
{
IntPtr currentPen = Gdi32.SelectObject(new HandleRef(this, Hdc), 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 = Gdi32.SelectObject(new HandleRef(this, Hdc), 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 = Gdi32.SelectObject(new HandleRef(this, Hdc), hInitialBmp);
Debug.Assert(currentBmp == hCurrentBmp, "DeviceContext thinks a different brush is selected than the HDC");
hCurrentBmp = IntPtr.Zero;
}
handleToDelete = handle;
break;
}
Gdi32.DeleteObject(handleToDelete);
}
public void DeleteObject(Gdi32.HGDIOBJ handle, GdiObjectType type)
{
Gdi32.HGDIOBJ handleToDelete = default;
switch (type)
{
case GdiObjectType.Pen:
if (handle == _hCurrentPen)
{
Gdi32.HGDIOBJ currentPen = Gdi32.SelectObject(this, _hInitialPen);
Debug.Assert(currentPen == _hCurrentPen, "DeviceContext thinks a different pen is selected than the HDC");
_hCurrentPen = default;
}
handleToDelete = handle;
break;
case GdiObjectType.Brush:
if (handle == _hCurrentBrush)
{
Gdi32.HGDIOBJ currentBrush = Gdi32.SelectObject(this, _hInitialBrush);
Debug.Assert(currentBrush == _hCurrentBrush, "DeviceContext thinks a different brush is selected than the HDC");
_hCurrentBrush = default;
}
handleToDelete = handle;
break;
case GdiObjectType.Bitmap:
if (handle == _hCurrentBmp)
{
Gdi32.HGDIOBJ currentBmp = Gdi32.SelectObject(this, _hInitialBmp);
Debug.Assert(currentBmp == _hCurrentBmp, "DeviceContext thinks a different brush is selected than the HDC");
_hCurrentBmp = default;
}
handleToDelete = handle;
break;
}
Gdi32.DeleteObject(handleToDelete);
}
public IntPtr SelectObject(IntPtr hObj, GdiObjectType type)
{
switch (type)
{
case GdiObjectType.Pen:
this.hCurrentPen = hObj;
break;
case GdiObjectType.Brush:
this.hCurrentBrush = hObj;
break;
case GdiObjectType.Bitmap:
this.hCurrentBmp = hObj;
break;
}
return IntUnsafeNativeMethods.SelectObject(new HandleRef(this, this.Hdc), new HandleRef(null, hObj));
}
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));
}
