/// <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);
}
internal void Dispose(bool disposing)
{
if (dc != null)
{
DbgUtil.AssertFinalization(this, disposing);
try
{
// Restore original dc.
dc.RestoreHdc();
if (disposeDc)
{
dc.Dispose(disposing);
}
if (graphics != null) // if created from a Graphics object...
{
graphics.ReleaseHdcInternal(dc.Hdc);
graphics = null;
}
}
catch (Exception ex)
{
if (ClientUtils.IsSecurityOrCriticalException(ex))
{
throw; // rethrow the original exception.
}
Debug.Fail("Exception thrown during disposing: \r\n" + ex.ToString());
}
finally
{
dc = null;
}
}
}
