/// <summary>
/// Returns a TEXTMETRIC structure for the font selected in the device context
/// represented by this object, in units of pixels.
/// </summary>
public Gdi32.TEXTMETRICW GetTextMetrics()
{
// Set the mapping mode to MM_TEXT so we deal with units of pixels.
Gdi32.MM mapMode = DeviceContext.MapMode;
bool setupDC = mapMode != Gdi32.MM.TEXT;
if (setupDC)
{
// Changing the MapMode will affect viewport and window extent and origin, we save the dc
// state so all those properties can be properly restored once done.
DeviceContext.SaveHdc();
}
try
{
if (setupDC)
{
mapMode = DeviceContext.SetMapMode(Gdi32.MM.TEXT);
}
var tm = new Gdi32.TEXTMETRICW();
Gdi32.GetTextMetricsW(DeviceContext, ref tm);
return(tm);
}
finally
{
if (setupDC)
{
DeviceContext.RestoreHdc();
}
}
}
/// <summary>
/// Returns a TEXTMETRIC structure for the font selected in the device context
/// represented by this object, in units of pixels.
/// </summary>
public IntNativeMethods.TEXTMETRIC GetTextMetrics()
{
IntNativeMethods.TEXTMETRIC tm = new IntNativeMethods.TEXTMETRIC();
HandleRef hdc = new HandleRef(DeviceContext, DeviceContext.Hdc);
// Set the mapping mode to MM_TEXT so we deal with units of pixels.
DeviceContextMapMode mapMode = DeviceContext.MapMode;
bool setupDC = mapMode != DeviceContextMapMode.Text;
if (setupDC)
{
// Changing the MapMode will affect viewport and window extent and origin, we save the dc
// state so all those properties can be properly restored once done.
DeviceContext.SaveHdc();
}
try
{
if (setupDC)
{
mapMode = DeviceContext.SetMapMode(DeviceContextMapMode.Text);
}
IntUnsafeNativeMethods.GetTextMetrics(hdc, ref tm);
}
finally
{
if (setupDC)
{
DeviceContext.RestoreHdc();
}
}
return(tm);
}
/// <devdoc>
///
/// VSWhidbey #455702.
///
/// Since we added mirroring to certain controls, we need to make sure the
/// error icons show up in the correct place. We cannot mirror the errorwindow
/// in EnsureCreated (although that would have been really easy), since we use
/// GDI+ for some of this code, and as we all know, GDI+ does not handle mirroring
/// at all.
///
/// To work around that we create our own mirrored dc when we need to.
///
/// </devdoc>
void CreateMirrorDC(IntPtr hdc, int originOffset) {
Debug.Assert(mirrordc == null, "Why is mirrordc non-null? Did you not call RestoreMirrorDC?");
mirrordc = DeviceContext.FromHdc(hdc);
if (parent.IsMirrored && mirrordc != null) {
mirrordc.SaveHdc();
mirrordcExtent = mirrordc.ViewportExtent;
mirrordcOrigin = mirrordc.ViewportOrigin;
mirrordcMode = mirrordc.SetMapMode(DeviceContextMapMode.Anisotropic);
mirrordc.ViewportExtent = new Size(-(mirrordcExtent.Width), mirrordcExtent.Height);
mirrordc.ViewportOrigin = new Point(mirrordcOrigin.X + originOffset, mirrordcOrigin.Y);
}
}
