private void InitSystemButtons()
{
_closeButton = new CaptionButton();
_closeButton.Key = "CloseButton";
_closeButton.Visible = true;
_closeButton.HitTestCode = (int)NativeMethods.NCHITTEST.HTCLOSE;
_closeButton.SystemCommand = (int)NativeMethods.SystemCommands.SC_CLOSE;
_captionButtons.Add(_closeButton);
_restoreButton = new CaptionButton();
_restoreButton.Key = "RestoreButton";
_restoreButton.Enabled = this.MaximizeBox;
_restoreButton.HitTestCode = (int)NativeMethods.NCHITTEST.HTMAXBUTTON;
_restoreButton.SystemCommand = (int)NativeMethods.SystemCommands.SC_RESTORE;
_captionButtons.Add(_restoreButton);
_maximizeButton = new CaptionButton();
_maximizeButton.Key = "MaximizeButton";
_maximizeButton.Enabled = this.MaximizeBox;
_maximizeButton.HitTestCode = (int)NativeMethods.NCHITTEST.HTMAXBUTTON;
_maximizeButton.SystemCommand = (int)NativeMethods.SystemCommands.SC_MAXIMIZE;
_captionButtons.Add(_maximizeButton);
_minimizeButton = new CaptionButton();
_minimizeButton.Key = "MinimizeButton";
_minimizeButton.Enabled = this.MinimizeBox;
_minimizeButton.HitTestCode = (int)NativeMethods.NCHITTEST.HTMINBUTTON;
_minimizeButton.SystemCommand = (int)NativeMethods.SystemCommands.SC_MINIMIZE;
_captionButtons.Add(_minimizeButton);
_helpButton = new CaptionButton();
_helpButton.Key = "HelpButton";
_helpButton.Visible = this.HelpButton;
_helpButton.HitTestCode = (int)NativeMethods.NCHITTEST.HTHELP;
_helpButton.SystemCommand = (int)NativeMethods.SystemCommands.SC_CONTEXTHELP;
_captionButtons.Add(_helpButton);
OnUpdateWindowState();
}
private void DrawButton(CaptionButton button)
{
if (IsHandleCreated)
{
// MSDN states that only WINDOW and INTERSECTRGN are needed,
// but other sources confirm that CACHE is required on Win9x
// and you need CLIPSIBLINGS to prevent painting on overlapping windows.
IntPtr hDC = NativeMethods.GetDCEx(this.Handle, (IntPtr)1,
(int)(NativeMethods.DCX.DCX_WINDOW | NativeMethods.DCX.DCX_INTERSECTRGN
| NativeMethods.DCX.DCX_CACHE | NativeMethods.DCX.DCX_CLIPSIBLINGS));
if (hDC != IntPtr.Zero)
{
using (Graphics g = Graphics.FromHdc(hDC))
{
button.DrawButton(g, true);
}
}
NativeMethods.ReleaseDC(this.Handle, hDC);
}
}
public void Add(CaptionButton button)
{
this.List.Add(button);
}
/// <summary>
/// This method handles depressing the titlebar button. It captures the mouse and creates a message loop
/// filtring only the mouse buttons until a WM_MOUSEMOVE or WM_LBUTTONUP message is received.
/// </summary>
/// <param name="currentButton">The button that was pressed</param>
/// <returns>true if WM_LBUTTONUP occured over this button; false when mouse was moved away from this button.</returns>
private bool DepressButton(CaptionButton currentButton)
{
try
{
// callect all mouse events (should do the same as SetCapture())
this.Capture = true;
// draw button in pressed mode
currentButton.State = CaptionButtonState.Pressed;
DrawButton(currentButton);
// loop until button is released
bool result = false;
bool done = false;
while (!done)
{
// NOTE: This struct needs to be here. We had strange error (starting from Beta 2).
// when this was defined at begining of this method. also check if types are correct (no overlap).
Message m = new Message();
if (NativeMethods.PeekMessage(ref m, IntPtr.Zero,
(int)NativeMethods.WindowMessages.WM_MOUSEFIRST, (int)NativeMethods.WindowMessages.WM_MOUSELAST,
(int)NativeMethods.PeekMessageOptions.PM_REMOVE))
{
Log(MethodInfo.GetCurrentMethod(), "Message = {0}, Button = {1}", (NativeMethods.WindowMessages)m.Msg, currentButton);
switch (m.Msg)
{
case (int)NativeMethods.WindowMessages.WM_LBUTTONUP:
{
if (currentButton.State == CaptionButtonState.Pressed)
{
currentButton.State = CaptionButtonState.Normal;
DrawButton(currentButton);
}
Point pt = PointToWindow(PointToScreen(new Point(m.LParam.ToInt32())));
Log(MethodInfo.GetCurrentMethod(), "### Point = ({0}, {1})", pt.X, pt.Y);
result = currentButton.Bounds.Contains(pt);
done = true;
}
break;
case (int)NativeMethods.WindowMessages.WM_MOUSEMOVE:
{
Point clientPoint = PointToWindow(PointToScreen(new Point(m.LParam.ToInt32())));
if (currentButton.Bounds.Contains(clientPoint))
{
if (currentButton.State == CaptionButtonState.Normal)
{
currentButton.State = CaptionButtonState.Pressed;
DrawButton(currentButton);
}
}
else
{
if (currentButton.State == CaptionButtonState.Pressed)
{
currentButton.State = CaptionButtonState.Normal;
DrawButton(currentButton);
}
}
// [1531]: These variables need to be reset here although thay aren't changed
// before reaching this point
result = false;
done = false;
}
break;
}
}
}
return(result);
}
finally
{
this.Capture = false;
}
}
