private void PaintNonClientRegion(ref Message m)
{
IntPtr handle = Handle;
NativeMethods.RECT windowRect;
NativeMethods.GetWindowRect(handle, out windowRect);
windowRect = new NativeMethods.RECT(
0,
0,
windowRect.Right - windowRect.Left,
windowRect.Bottom - windowRect.Top);
using (var deviceContext = new NativeMethods.DeviceContext(handle))
{
var renderer = new VisualStyleRenderer(
Enabled
? ReadOnly
? VisualStyleElement.TextBox.TextEdit.ReadOnly
: VisualStyleElement.TextBox.TextEdit.Normal
: VisualStyleElement.TextBox.TextEdit.Disabled);
int clipResult =
NativeMethods.ExcludeClipRect(
deviceContext.GetHdc(),
_borderRect.Left,
_borderRect.Top,
windowRect.Right - _borderRect.Right,
windowRect.Bottom - _borderRect.Bottom);
if (clipResult == NativeMethods.SIMPLEREGION
|| clipResult == NativeMethods.COMPLEXREGION)
{
if (renderer.IsBackgroundPartiallyTransparent())
renderer.DrawParentBackground(deviceContext, windowRect.ToRectangle(), this);
renderer.DrawBackground(deviceContext, windowRect.ToRectangle());
}
}
m.Result = IntPtr.Zero;
}
private void CalculateNonClientSize(ref Message m)
{
NativeMethods.NCCALCSIZE_PARAMS parameters;
NativeMethods.RECT windowRect;
ExtractParamsAndWindowRect(ref m, out parameters, out windowRect);
var renderer = new VisualStyleRenderer(VisualStyleElement.TextBox.TextEdit.Normal);
using (var deviceContext = new NativeMethods.DeviceContext(Handle))
{
var contentRect = new NativeMethods.RECT(
renderer.GetBackgroundContentRectangle(deviceContext, windowRect.ToRectangle()));
contentRect.Inflate(-1, -1);
_borderRect = new NativeMethods.RECT(
contentRect.Left - windowRect.Left,
contentRect.Top - windowRect.Top,
windowRect.Right - contentRect.Right,
windowRect.Bottom - contentRect.Bottom);
if (m.WParam == IntPtr.Zero)
Marshal.StructureToPtr(contentRect, m.LParam, false);
else
{
parameters.rgrc0 = contentRect;
Marshal.StructureToPtr(parameters, m.LParam, false);
}
}
m.Result = new IntPtr(NativeMethods.WVR_REDRAW);
}
