private void ResizeCustomControl(IntPtr hWnd)
{
if (hWnd == m_hWnd)
{
IntPtr hSelectButton =
InteropUtil.AssumeNonZero(InteropUtil.GetDlgItem(InteropUtil.AssumeNonZero(hWnd),
InteropUtil.ID_SELECT));
IntPtr hOkButton =
InteropUtil.AssumeNonZero(InteropUtil.GetDlgItem(InteropUtil.AssumeNonZero(hWnd),
InteropUtil.ID_CUSTOM_CANCEL));
IntPtr hParent = InteropUtil.AssumeNonZero(InteropUtil.GetParent(hWnd));
IntPtr fileName =
InteropUtil.AssumeNonZero(InteropUtil.GetDlgItem(hParent, InteropUtil.ID_FileNameCombo));
/*var right = fileName.GetWindowPlacement().Right;
* var top = hSelectButton.GetWindowPlacement().Top;*/
var rect = new InteropUtil.RECT();
InteropUtil.WINDOWPLACEMENT selectRect = InteropUtil.GetWindowPlacement(hSelectButton);
rect.top = selectRect.Top;
rect.bottom = selectRect.Bottom;
rect.right = InteropUtil.GetWindowPlacement(fileName).Right;
rect.left = rect.right - (m_cancelWidth + m_buttonGap + m_selectWidth);
ResizeCustomControl(hWnd, rect, hOkButton, hSelectButton);
}
}
private void ResizeCustomControl(IntPtr hWnd, InteropUtil.RECT rect, params IntPtr[] buttons)
{
InteropUtil.Assume(buttons != null && buttons.Length > 0);
InteropUtil.AssumeNonZero(hWnd);
InteropUtil.WINDOWPLACEMENT wndLoc = InteropUtil.GetWindowPlacement(hWnd);
wndLoc.Right = rect.right;
InteropUtil.SetWindowPlacement(hWnd, ref wndLoc);
foreach (IntPtr hBtn in buttons)
{
int btnRight, btnWidth;
m_calcPosMap[InteropUtil.GetDlgCtrlID(hBtn)](this, rect.right, out btnRight, out btnWidth);
PositionButton(hBtn, btnRight, btnWidth);
}
//see bug # 844
//We clip hWnd to only draw in the rectangle around our custom buttons.
//When we supply a custom dialog template to GetOpenFileName(), it adds
//an extra HWND to the open file dialog, and then sticks all the controls
//in the dialog //template inside the HWND. It then resizes the control
//to stretch from the top of the open file dialog to the bottom of the
//window, extending the bottom of the window large enough to include the
//additional height of the dialog template. This ends up sticking our custom
//buttons at the bottom of the window, which is what we want.
//
//However, the fact that the parent window extends from the top of the open
//file dialog was causing some painting problems on Windows XP SP 3 systems.
//Basically, because the window was covering the predefined controls on the
//open file dialog, they were not getting painted. This results in a blank
//window. I tried setting an extended WS_EX_TRANSPARENT style on the dialog,
//but that didn't help.
//
//So, to fix the problem I setup a window region for the synthetic HWND.
//This clips the drawing of the window to only within the region containing
//the custom buttons, and thus avoids the problem.
//
//I'm not sure why this wasn't an issue on Vista.
IntPtr hRgn = InteropUtil.CreateRectRgnIndirect(ref rect);
try
{
if (InteropUtil.SetWindowRgn(hWnd, hRgn, true) == 0)
{
//setting the region failed, so we need to delete the region we created above.
InteropUtil.DeleteObject(hRgn);
}
}
catch
{
if (hRgn != IntPtr.Zero)
{
InteropUtil.DeleteObject(hRgn);
}
}
}
private void PositionButton(IntPtr hWnd, int right, int width)
{
InteropUtil.AssumeNonZero(hWnd);
int id = InteropUtil.GetDlgCtrlID(hWnd);
//hWnd.BringWindowToTop();
InteropUtil.WINDOWPLACEMENT buttonLoc = InteropUtil.GetWindowPlacement(hWnd);
buttonLoc.Right = right;
buttonLoc.Left = buttonLoc.Right - width;
InteropUtil.SetWindowPlacement(hWnd, ref buttonLoc);
InteropUtil.InvalidateRect(hWnd, IntPtr.Zero, true);
}
private void InitDialog(IntPtr hWnd)
{
m_hWnd = hWnd;
IntPtr hParent = InteropUtil.AssumeNonZero(InteropUtil.GetParent(hWnd));
InteropUtil.SetWindowSubclass(hParent, m_openFileSubClassDelegate, 0, 0);
//disable and hide the filter combo box
IntPtr hFilterCombo = InteropUtil.AssumeNonZero(InteropUtil.GetDlgItem(hParent, InteropUtil.ID_FilterCombo));
InteropUtil.EnableWindow(hFilterCombo, false);
InteropUtil.SendMessage(hParent, InteropUtil.CDM_HIDECONTROL, InteropUtil.ID_FilterCombo, 0);
InteropUtil.SendMessage(hParent, InteropUtil.CDM_HIDECONTROL, InteropUtil.ID_FilterLabel, 0);
//update the file name label
IntPtr hFileNameLabel =
InteropUtil.AssumeNonZero(InteropUtil.GetDlgItem(hParent, InteropUtil.ID_FileNameLabel));
if (FileNameLabel != String.Empty)
{
InteropUtil.SendMessageString(hFileNameLabel, InteropUtil.WM_SETTEXT, 0, FileNameLabel);
}
//find the button controls in the parent
IntPtr hOkButton = InteropUtil.AssumeNonZero(InteropUtil.GetDlgItem(hParent, InteropUtil.IDOK));
IntPtr hCancelButton = InteropUtil.AssumeNonZero(InteropUtil.GetDlgItem(hParent, InteropUtil.IDCANCEL));
//We don't want the accelerator keys for the ok and cancel buttons to work, because
//they are not shown on the dialog. However, we still want the buttons enabled
//so that "esc" and "enter" have the behavior they used to. So, we just
//clear out their text instead.
InteropUtil.SetWindowTextW(hOkButton, String.Empty);
InteropUtil.SetWindowTextW(hCancelButton, String.Empty);
//find our button controls
IntPtr hSelectButton = InteropUtil.AssumeNonZero(InteropUtil.GetDlgItem(hWnd, InteropUtil.ID_SELECT));
IntPtr hCustomCancelButton =
InteropUtil.AssumeNonZero(InteropUtil.GetDlgItem(hWnd, InteropUtil.ID_CUSTOM_CANCEL));
if (!String.IsNullOrEmpty(SelectLabel))
{
InteropUtil.SetWindowTextW(hSelectButton, SelectLabel);
}
if (!String.IsNullOrEmpty(CancelLabel))
{
InteropUtil.SetWindowTextW(hCustomCancelButton, CancelLabel);
}
//copy the font from the parent's buttons
InteropUtil.LoadFontFrom(hSelectButton, hOkButton);
InteropUtil.LoadFontFrom(hCustomCancelButton, hCancelButton);
InteropUtil.WINDOWPLACEMENT cancelLoc = InteropUtil.GetWindowPlacement(hCancelButton);
//hide the ok and cancel buttons
InteropUtil.SendMessage(hParent, InteropUtil.CDM_HIDECONTROL, InteropUtil.IDOK, 0);
InteropUtil.SendMessage(hParent, InteropUtil.CDM_HIDECONTROL, InteropUtil.IDCANCEL, 0);
//expand the file name combo to take up the space left by the OK and cancel buttons.
IntPtr hFileName = InteropUtil.AssumeNonZero(InteropUtil.GetDlgItem(hParent, InteropUtil.ID_FileNameCombo));
InteropUtil.WINDOWPLACEMENT fileNameLoc = InteropUtil.GetWindowPlacement(hFileName);
fileNameLoc.Right = InteropUtil.GetWindowPlacement(hOkButton).Right;
InteropUtil.SetWindowPlacement(hFileName, ref fileNameLoc);
InteropUtil.WINDOWPLACEMENT parentLoc = InteropUtil.GetWindowPlacement(hParent);
//subtract the height of the missing cancel button
parentLoc.Bottom -= (cancelLoc.Bottom - cancelLoc.Top);
InteropUtil.SetWindowPlacement(hParent, ref parentLoc);
//move the select and custom cancel buttons to the right hand side of the window:
InteropUtil.WINDOWPLACEMENT selectLoc = InteropUtil.GetWindowPlacement(hSelectButton);
InteropUtil.WINDOWPLACEMENT customCancelLoc = InteropUtil.GetWindowPlacement(hCustomCancelButton);
m_cancelWidth = customCancelLoc.Right - customCancelLoc.Left;
m_selectWidth = selectLoc.Right - selectLoc.Left;
m_buttonGap = customCancelLoc.Left - selectLoc.Right;
InteropUtil.WINDOWPLACEMENT ctrlLoc = InteropUtil.GetWindowPlacement(hWnd);
ctrlLoc.Right = fileNameLoc.Right;
//ResizeCustomControl(hWnd, fileNameLoc.Right, hCustomCancelButton, hSelectButton);
ResizeCustomControl(hWnd);
}