private void ResizeCustomControl(IntPtr hWnd, InteropUtil.RECT rect, params IntPtr[] buttons)
{
Util.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 int DefViewSubClass
(
IntPtr hWnd,
uint uMsg,
IntPtr wParam,
IntPtr lParam,
IntPtr uIdSubclass,
uint dwRefData
)
{
if (uMsg == InteropUtil.WM_NOTIFY)
{
var header = (InteropUtil.NMHDR)Marshal.PtrToStructure(lParam, typeof(InteropUtil.NMHDR));
if (header.code == InteropUtil.LVN_ITEMCHANGED && header.hwndFrom != IntPtr.Zero && header.idFrom == 1)
{
var nmListView = (InteropUtil.NMLISTVIEW)Marshal.PtrToStructure(lParam, typeof(InteropUtil.NMLISTVIEW));
var oldSelected = (nmListView.uOldState & InteropUtil.LVIS_SELECTED) != 0;
var newSelected = (nmListView.uNewState & InteropUtil.LVIS_SELECTED) != 0;
if (!oldSelected && newSelected)
{
if (!m_suppressSelectionChange)
{
//the item went from not selected to being selected
//so we want to look and see if the selected item is a folder, and if so
//change the text of the item box to be the item on the folder. But, before we do that
//we want to make sure that the box isn't currently focused.
var hParent = hWnd.GetParent();
var hFNCombo = hParent.GetDlgItem(InteropUtil.ID_FileNameCombo);
var hFNEditBox = hParent.GetDlgItem(InteropUtil.ID_FileNameTextBox);
var hFocus = InteropUtil.GetFocus();
if
(
(hFNCombo == IntPtr.Zero || hFNCombo != hFocus) &&
(hFNEditBox == IntPtr.Zero || hFNEditBox != hFocus)
)
{
SetFileNameToSelectedItem(header.hwndFrom, hFNCombo, nmListView.iItem);
}
}
m_suppressSelectionChange = false;
}
}
}
return(hWnd.DefSubclassProc(uMsg, wParam, lParam));
}
protected override bool RunDialog(IntPtr hwndOwner)
{
Util.Assume(Marshal.SystemDefaultCharSize == 2, "The character size should be 2");
var nativeBuffer = Marshal.AllocCoTaskMem(InteropUtil.NumberOfFileChars * 2);
IntPtr filterBuffer = IntPtr.Zero;
try
{
var openFileName = new InteropUtil.OpenFileName();
openFileName.Initialize();
openFileName.hwndOwner = hwndOwner;
var chars = new char[InteropUtil.NumberOfFileChars];
try
{
if (File.Exists(Path))
{
if (AcceptFiles)
{
var fileName = System.IO.Path.GetFileName(Path);
var length = Math.Min(fileName.Length, InteropUtil.NumberOfFileChars);
fileName.CopyTo(0, chars, 0, length);
openFileName.lpstrInitialDir = System.IO.Path.GetDirectoryName(Path);
}
else
{
openFileName.lpstrInitialDir = System.IO.Path.GetDirectoryName(Path);
}
}
else if (Directory.Exists(Path))
{
openFileName.lpstrInitialDir = Path;
}
else
{
//the path does not exist.
//We don't just want to throw it away, however.
//The initial path we get is most likely provided by the user in some way.
//It could be what they typed into a text box before clicking a browse button,
//or it could be a value they had entered previously that used to be valid, but now no longer exists.
//In any case, we don't want to throw out the user's text. So, we find the first parent
//directory of Path that exists on disk.
//We will set the initial directory to that path, and then set the initial file to
//the rest of the path. The user will get an error if the click "OK"m saying that the selected path
//doesn't exist, but that's ok. If we didn't do this, and showed the path, if they clicked
//OK without making changes we would actually change the selected path, which would be bad.
//This way, if the users want's to change the folder, he actually has to change something.
string pathToShow;
InitializePathDNE(Path, out openFileName.lpstrInitialDir, out pathToShow);
pathToShow = pathToShow ?? "";
var length = Math.Min(pathToShow.Length, InteropUtil.NumberOfFileChars);
pathToShow.CopyTo(0, chars, 0, length);
}
}
catch
{
}
Marshal.Copy(chars, 0, nativeBuffer, chars.Length);
openFileName.lpstrFile = nativeBuffer;
if (!AcceptFiles)
{
var str = string.Format("Folders\0*.{0}-{1}\0\0", Guid.NewGuid().ToString("N"), Guid.NewGuid().ToString("N"));
filterBuffer = openFileName.lpstrFilter = Marshal.StringToCoTaskMemUni(str);
}
else
{
openFileName.lpstrFilter = IntPtr.Zero;
}
openFileName.nMaxCustFilter = 0;
openFileName.nFilterIndex = 0;
openFileName.nMaxFile = InteropUtil.NumberOfFileChars;
openFileName.nMaxFileTitle = 0;
openFileName.lpstrTitle = Title;
openFileName.lpfnHook = m_hookDelegate;
openFileName.templateID = InteropUtil.IDD_CustomOpenDialog;
openFileName.hInstance = Marshal.GetHINSTANCE(typeof(OpenFileOrFolderDialog).Module);
openFileName.Flags =
InteropUtil.OFN_DONTADDTORECENT |
InteropUtil.OFN_ENABLEHOOK |
InteropUtil.OFN_ENABLESIZING |
InteropUtil.OFN_NOTESTFILECREATE |
InteropUtil.OFN_EXPLORER |
InteropUtil.OFN_FILEMUSTEXIST |
InteropUtil.OFN_PATHMUSTEXIST |
InteropUtil.OFN_NODEREFERENCELINKS |
InteropUtil.OFN_ENABLETEMPLATE |
(ShowReadOnly ? 0 : InteropUtil.OFN_HIDEREADONLY);
m_useCurrentDir = false;
var ret = InteropUtil.GetOpenFileNameW(ref openFileName);
//var extErrpr = InteropUtil.CommDlgExtendedError();
//InteropUtil.CheckForWin32Error();
if (m_useCurrentDir)
{
Path = m_currentFolder;
return(true);
}
else if (ret)
{
Marshal.Copy(nativeBuffer, chars, 0, chars.Length);
var firstZeroTerm = ((IList)chars).IndexOf('\0');
if (firstZeroTerm >= 0 && firstZeroTerm <= chars.Length - 1)
{
Path = new string(chars, 0, firstZeroTerm);
}
}
return(ret);
}
finally
{
Marshal.FreeCoTaskMem(nativeBuffer);
if (filterBuffer != IntPtr.Zero)
{
Marshal.FreeCoTaskMem(filterBuffer);
}
}
}