// Our wndproc
private int WindowProc(IntPtr hwnd, uint msg, uint wParam, int lParam)
{
Message message = new Message();
message.HWnd = hwnd;
message.Msg = (int)msg;
// Need this casting, for flags that are passed as large unsigned values
message.WParam = (IntPtr)(int)(((UIntPtr)wParam).ToUInt32());
message.LParam = (IntPtr)lParam;
// Call our usual code
return(WndProc(ref message));
}
/// <summary>
/// handle vertical scroll
/// </summary>
/// <param name="m"></param>
private void OnVScroll(ref Message m)
{
int newValue = Int32.MinValue;
NativeScroll.SCROLLINFO sc = ScrollInfo(NativeScroll.SB_VERT);
int value = sc.nPos;
int nScrollCode = NativeWindowCommon.LoWord((int)m.WParam);
switch (nScrollCode)
{
case NativeScroll.SB_TOP:
newValue = 0;
break;
case NativeScroll.SB_BOTTOM:
newValue = sc.nMax;
break;
case NativeScroll.SB_LINEUP:
newValue = value - 1;
break;
case NativeScroll.SB_LINEDOWN:
newValue = value + 1;
break;
case NativeScroll.SB_PAGEUP:
newValue = value - sc.nPage;
break;
case NativeScroll.SB_PAGEDOWN:
newValue = value + sc.nPage;
break;
case NativeScroll.SB_THUMBPOSITION:
EndThumbDrag();
break;
case NativeScroll.SB_THUMBTRACK:
StartThumbDrag();
newValue = GetThumbTrackVal(sc.nTrackPos);
value = GetPrevScrollVal(sc.nPos);
break;
}
if (newValue != Int32.MinValue && newValue != value)
{
ScrollVertically((ScrollEventType)m.WParam, newValue, value, true);
}
}
protected int WndProc(ref Message m)
#endif
{
MouseEventArgs mouseEvents;
switch (m.Msg)
{
#if !PocketPC
case NativeWindowCommon.CBN_DROPDOWN:
{
if (OriginalDropDownWindowProc == IntPtr.Zero)
{
NativeWindowCommon.COMBOBOXINFO comboBoxInfo = new NativeWindowCommon.COMBOBOXINFO();
// alloc ptrComboBoxInfo
IntPtr ptrComboBoxInfo = Marshal.AllocHGlobal(Marshal.SizeOf(comboBoxInfo));
try
{
//get combo Box Info
comboBoxInfo.cbSize = (IntPtr)Marshal.SizeOf(comboBoxInfo);
Marshal.StructureToPtr(comboBoxInfo, ptrComboBoxInfo, true);
IntPtr intptr = NativeHeader.SendMessage(this.Handle, NativeWindowCommon.CB_GETCOMBOBOXINFO, 0, ptrComboBoxInfo);
//CB_GETCOMBOBOXINFO : If the send message succeeds, the return value is nonzero.
int returnValue = intptr.ToInt32();
if (returnValue > 0)
{
// get the info from ptrComboBoxInfo to comboBoxInfo
comboBoxInfo = (NativeWindowCommon.COMBOBOXINFO)Marshal.PtrToStructure(ptrComboBoxInfo, typeof(NativeWindowCommon.COMBOBOXINFO));
// save hwnd drop down list
HwndDropDownList = comboBoxInfo.hwndList;
//replace the window proc of the drop down list
CustomDropDownWindowProc = new ControlWndProc(DropDownWindowProc);
// save the original drop down list (most be member in the class so the garbig collection will not free it)
OriginalDropDownWindowProc = (IntPtr)NativeWindowCommon.SetWindowLong(HwndDropDownList,
NativeWindowCommon.GWL_WNDPROC, Marshal.GetFunctionPointerForDelegate(CustomDropDownWindowProc).ToInt32());
}
else
{
Debug.Assert(false);
}
}
finally
{
// free the ptrComboBoxInfo
Marshal.FreeHGlobal(ptrComboBoxInfo);
}
}
}
break;
#endif
case NativeWindowCommon.WM_LBUTTONDOWN:
case NativeWindowCommon.WM_LBUTTONDBLCLK:
if (!this.DroppedDown)
{
// prevent drop down on combo - to prevent combo openning on non parkable controls
// - it must be handled manually
mouseEvents = new MouseEventArgs(MouseButtons.Left, 0,
NativeWindowCommon.LoWord((int)m.LParam), NativeWindowCommon.HiWord((int)m.LParam), 0);
this.OnMouseDown(mouseEvents);
// provide doubleclick event
#if !PocketPC
if (m.Msg == NativeWindowCommon.WM_LBUTTONDBLCLK)
{
this.OnMouseDoubleClick(mouseEvents);
}
return;
#else
return(0);
#endif
}
break;
}
#if !PocketPC
base.WndProc(ref m);
#else
return(NativeWindowCommon.CallWindowProc(OrigWndProc, m.HWnd, (uint)m.Msg, (uint)m.WParam.ToInt32(), m.LParam.ToInt32()));
#endif
}
protected override void WndProc(ref Message m)
/// <summary>
/// handle horizontal scroll
/// </summary>
/// <param name="m"></param>
private void OnHScroll(ref Message m)
{
int newValue = int.MinValue;
NativeScroll.SCROLLINFO sc = new NativeScroll.SCROLLINFO();
int nScrollCode = NativeWindowCommon.LoWord((int)m.WParam);
sc = ScrollInfo(NativeScroll.SB_HORZ);
int value = sc.nPos;
int maxValue = sc.nMax;
switch (nScrollCode)
{
case NativeScroll.SB_LEFT:
newValue = 0;
break;
case NativeScroll.SB_RIGHT:
newValue = maxValue;
break;
case NativeScroll.SB_LINELEFT:
newValue = value - 1;
break;
case NativeScroll.SB_LINERIGHT:
if (value + 1 <= maxValue)
{
newValue = value + 1;
}
break;
case NativeScroll.SB_PAGELEFT:
newValue = value - sc.nPage;
break;
case NativeScroll.SB_PAGERIGHT:
newValue = value + sc.nPage;
break;
case NativeScroll.SB_THUMBTRACK:
newValue = sc.nTrackPos;
break;
}
//Sometimes we get here even if no horizontal scrollbar exsits
//happens during load of RTL table in new studio designer
//we should not Scroll if we do not have horizontal scollbar
if (newValue != int.MinValue && isHorizontalScrollBarVisible)
{
ScrollEventArgs arg = new ScrollEventArgs((ScrollEventType)m.WParam, value, newValue, ScrollOrientation.HorizontalScroll);
this.OnScroll(arg);
ScrollHorizontally(value, newValue);
Invalidate();
#if !PocketPC
if (this.DesignMode)
{
RefreshChildrensGlyphs();
}
#endif
}
return;
}
