private void ResizeCustomControl(IntPtr hWnd, InteropUtil.RECT rect, params IntPtr[] buttons)
{
DialogUtil.Assume(buttons != null && buttons.Length > 0);
hWnd.AssumeNonZero();
var wndLoc = hWnd.GetWindowPlacement();
wndLoc.Right = rect.right;
hWnd.SetWindowPlacement(ref wndLoc);
foreach (var hBtn in buttons)
{
int btnRight, btnWidth;
m_calcPosMap[hBtn.GetDlgCtrlID()](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.
var hRgn = InteropUtil.CreateRectRgnIndirect(ref rect);
try
{
if (hWnd.SetWindowRgn(hRgn, true) == 0)
{
//setting the region failed, so we need to delete the region we created above.
hRgn.DeleteObject();
}
}
catch
{
if (hRgn != IntPtr.Zero)
{
hRgn.DeleteObject();
}
}
}
private void PositionButton(IntPtr hWnd, int right, int width)
{
hWnd.AssumeNonZero();
var id = hWnd.GetDlgCtrlID();
//hWnd.BringWindowToTop();
var buttonLoc = hWnd.GetWindowPlacement();
buttonLoc.Right = right;
buttonLoc.Left = buttonLoc.Right - width;
hWnd.SetWindowPlacement(ref buttonLoc);
hWnd.InvalidateRect(IntPtr.Zero, true);
}
private void InitDialog(IntPtr hWnd)
{
m_hWnd = hWnd;
var hParent = hWnd.GetParent().AssumeNonZero();
hParent.SetWindowSubclass(m_openFileSubClassDelegate, 0, 0);
//disable and hide the filter combo box
var hFilterCombo = hParent.GetDlgItem(InteropUtil.ID_FilterCombo).AssumeNonZero();
hFilterCombo.EnableWindow(false);
hParent.SendMessage(InteropUtil.CDM_HIDECONTROL, InteropUtil.ID_FilterCombo, 0);
hParent.SendMessage(InteropUtil.CDM_HIDECONTROL, InteropUtil.ID_FilterLabel, 0);
//update the file name label
var hFileNameLabel = hParent.GetDlgItem(InteropUtil.ID_FileNameLabel).AssumeNonZero();
if (FileNameLabel != "")
{
hFileNameLabel.SendMessageString(InteropUtil.WM_SETTEXT, 0, FileNameLabel);
}
//find the button controls in the parent
var hOkButton = hParent.GetDlgItem(InteropUtil.IDOK).AssumeNonZero();
var hCancelButton = hParent.GetDlgItem(InteropUtil.IDCANCEL).AssumeNonZero();
//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.
hOkButton.SetWindowTextW("");
hCancelButton.SetWindowTextW("");
//find our button controls
var hSelectButton = hWnd.GetDlgItem(InteropUtil.ID_SELECT).AssumeNonZero();
var hCustomCancelButton = hWnd.GetDlgItem(InteropUtil.ID_CUSTOM_CANCEL).AssumeNonZero();
//copy the font from the parent's buttons
hSelectButton.LoadFontFrom(hOkButton);
hCustomCancelButton.LoadFontFrom(hCancelButton);
var cancelLoc = hCancelButton.GetWindowPlacement();
//hide the ok and cancel buttons
hParent.SendMessage(InteropUtil.CDM_HIDECONTROL, InteropUtil.IDOK, 0);
hParent.SendMessage(InteropUtil.CDM_HIDECONTROL, InteropUtil.IDCANCEL, 0);
//expand the file name combo to take up the space left by the OK and cancel buttons.
var hFileName = hParent.GetDlgItem(InteropUtil.ID_FileNameCombo).AssumeNonZero();
var fileNameLoc = hFileName.GetWindowPlacement();
fileNameLoc.Right = hOkButton.GetWindowPlacement().Right;
hFileName.SetWindowPlacement(ref fileNameLoc);
var parentLoc = hParent.GetWindowPlacement();
//subtract the height of the missing cancel button
parentLoc.Bottom -= (cancelLoc.Bottom - cancelLoc.Top);
hParent.SetWindowPlacement(ref parentLoc);
//move the select and custom cancel buttons to the right hand side of the window:
var selectLoc = hSelectButton.GetWindowPlacement();
var customCancelLoc = hCustomCancelButton.GetWindowPlacement();
m_cancelWidth = customCancelLoc.Right - customCancelLoc.Left;
m_selectWidth = selectLoc.Right - selectLoc.Left;
m_buttonGap = customCancelLoc.Left - selectLoc.Right;
var ctrlLoc = hWnd.GetWindowPlacement();
ctrlLoc.Right = fileNameLoc.Right;
//ResizeCustomControl(hWnd, fileNameLoc.Right, hCustomCancelButton, hSelectButton);
ResizeCustomControl(hWnd);
}
