/// <summary>
/// Processes Windows messages
/// </summary>
/// <param name="m">The Windows Message to process</param>
protected override void WndProc(ref Message m)
{
base.WndProc(ref m);
if (!this.visualStylesEnabled || this.BorderStyle != BorderStyle.Fixed3D)
{
return;
}
if (m.Msg == (int)WindowMessageFlags.WM_PRINT)
{
if ((m.LParam.ToInt32() & (int)WmPrintFlags.PRF_NONCLIENT) == (int)WmPrintFlags.PRF_NONCLIENT)
{
// open theme data
IntPtr hTheme = UxTheme.OpenThemeData(this.Handle, UxTheme.WindowClasses.TreeView);
if (hTheme != IntPtr.Zero)
{
// get the part and state needed
int partId = (int)UxTheme.Parts.TreeView.TreeItem;
int stateId = (int)UxTheme.PartStates.TreeItem.Normal;
RECT rect = new RECT();
rect.right = this.Width;
rect.bottom = this.Height;
RECT clipRect = new RECT();
// draw the left border
clipRect.left = rect.left;
clipRect.top = rect.top;
clipRect.right = rect.left + 2;
clipRect.bottom = rect.bottom;
UxTheme.DrawThemeBackground(hTheme, m.WParam, partId, stateId, ref rect, ref clipRect);
// draw the top border
clipRect.left = rect.left;
clipRect.top = rect.top;
clipRect.right = rect.right;
clipRect.bottom = rect.top + 2;
UxTheme.DrawThemeBackground(hTheme, m.WParam, partId, stateId, ref rect, ref clipRect);
// draw the right border
clipRect.left = rect.right - 2;
clipRect.top = rect.top;
clipRect.right = rect.right;
clipRect.bottom = rect.bottom;
UxTheme.DrawThemeBackground(hTheme, m.WParam, partId, stateId, ref rect, ref clipRect);
// draw the bottom border
clipRect.left = rect.left;
clipRect.top = rect.bottom - 2;
clipRect.right = rect.right;
clipRect.bottom = rect.bottom;
UxTheme.DrawThemeBackground(hTheme, m.WParam, partId, stateId, ref rect, ref clipRect);
}
UxTheme.CloseThemeData(hTheme);
}
}
}
private void OnBtnPaint(object sender, System.Windows.Forms.PaintEventArgs e)
{
IntPtr hTheme = UxTheme.OpenThemeData(this.Handle, "COMBOBOX");
// Makes sure Windows XP is running and
// a .manifest file exists for the EXE.
if (Environment.OSVersion.Version.Major >= 5
& Environment.OSVersion.Version.Minor > 0
& System.IO.File.Exists(Application.ExecutablePath + ".manifest")
& (hTheme != IntPtr.Zero))
{
//Grab DC
IntPtr hDC = e.Graphics.GetHdc();
int state = UxTheme.CBXS_NORMAL;
switch (this.m_state)
{
case State.Hot:
state = UxTheme.CBXS_HOT;
break;
case State.Pressed:
state = UxTheme.CBXS_PRESSED;
break;
case State.Disabled:
state = UxTheme.CBXS_DISABLED;
break;
default:
break;
}
try
{
RECT r = new RECT(e.ClipRectangle.Left, e.ClipRectangle.Right, e.ClipRectangle.Top, e.ClipRectangle.Bottom);
//Render button
UxTheme.DrawThemeBackground(hTheme, hDC, UxTheme.CP_DROPDOWN, state, r, null);
}
finally
{
//Release DC
e.Graphics.ReleaseHdc(hDC);
UxTheme.CloseThemeData(hTheme);
}
}
else
{
ButtonState state = ButtonState.Normal;
switch (this.m_state)
{
case State.Pressed:
state = ButtonState.Pushed;
break;
case State.Disabled:
state = ButtonState.Inactive;
break;
default:
break;
}
ControlPaint.DrawComboButton(e.Graphics, e.ClipRectangle, state);
}
}
