protected override void WndProc(ref Message m) { if (m.Msg == (int)Win32.Msgs.WM_NCLBUTTONDOWN) { if (IsDisposed) { return; } uint result = NativeMethods.SendMessage(this.Handle, (int)Win32.Msgs.WM_NCHITTEST, 0, (uint)m.LParam); if (result == 2 && DockPanel.AllowEndUserDocking && this.AllowEndUserDocking) // HITTEST_CAPTION { Activate(); m_dockPanel.BeginDrag(this); } else { base.WndProc(ref m); } return; } else if (m.Msg == (int)Win32.Msgs.WM_NCRBUTTONDOWN) { uint result = NativeMethods.SendMessage(this.Handle, (int)Win32.Msgs.WM_NCHITTEST, 0, (uint)m.LParam); if (result == 2) // HITTEST_CAPTION { DockPane theOnlyPane = (VisibleNestedPanes.Count == 1) ? VisibleNestedPanes[0] : null; if (theOnlyPane != null && theOnlyPane.ActiveContent != null) { theOnlyPane.ShowTabPageContextMenu(this, PointToClient(Control.MousePosition)); return; } } base.WndProc(ref m); return; } else if (m.Msg == (int)Win32.Msgs.WM_CLOSE) { if (NestedPanes.Count == 0) { base.WndProc(ref m); return; } for (int i = NestedPanes.Count - 1; i >= 0; i--) { DockContentCollection contents = NestedPanes[i].Contents; for (int j = contents.Count - 1; j >= 0; j--) { IDockContent content = contents[j]; if (content.DockHandler.DockState != DockState.Float) { continue; } if (!content.DockHandler.CloseButton) { continue; } if (content.DockHandler.HideOnClose) { content.DockHandler.Hide(); } else { content.DockHandler.Close(); } } } return; } else if (m.Msg == (int)Win32.Msgs.WM_NCLBUTTONDBLCLK) { uint result = NativeMethods.SendMessage(this.Handle, (int)Win32.Msgs.WM_NCHITTEST, 0, (uint)m.LParam); if (result != 2) // HITTEST_CAPTION { base.WndProc(ref m); return; } DockPanel.SuspendLayout(true); // Restore to panel foreach (DockPane pane in NestedPanes) { if (pane.DockState != DockState.Float) { continue; } pane.RestoreToPanel(); } DockPanel.ResumeLayout(true, true); return; } else if (m.Msg == WM_CHECKDISPOSE) { if (NestedPanes.Count == 0) { Dispose(); } return; } base.WndProc(ref m); }