// Gets the windows handle of an individual tab in a Windows Forms control
private IntPtr GetItemHwndByIndex()
{
// On Win32 Tab controls the table page is parented by the dialog box not the
// Tab control.
IntPtr hwndParent = _hwnd;
if (!_fIsWinform)
{
hwndParent = Misc.GetParent(hwndParent);
}
if (hwndParent != IntPtr.Zero)
{
// Get the tab name and match it with the window title of one of the children
string sName = WindowsTabItem.GetName(_hwnd, _item, true);
// If there is no tab name there is no way to match to one of the childrens window title.
if (!string.IsNullOrEmpty(sName))
{
return(Misc.FindWindowEx(hwndParent, IntPtr.Zero, null, sName));
}
}
return(IntPtr.Zero);
}
// if all the tab items have no name then the control is not useful
internal static bool IsValidControl(IntPtr hwnd)
{
for (int i = 0, c = GetItemCount(hwnd); i < c; i++)
{
if (!string.IsNullOrEmpty(WindowsTabItem.GetName(hwnd, i, true)))
{
return(true);
}
}
return(false);
}
private bool IsTabPage(IntPtr hwnd, out IntPtr hwndTab, out int item)
{
hwndTab = IntPtr.Zero;
item = -1;
if (!SafeNativeMethods.IsWindowVisible(hwnd))
{
return(false);
}
try
{
if (!HasTabPageStyle(hwnd))
{
return(false);
}
}
catch (ElementNotAvailableException)
{
// if the received an ElementNotAvailableException this hwnd can not be a
// tab page so return false.
return(false);
}
string dlgName = Misc.ProxyGetText(hwnd);
// if the dialog does not have a title there is no way to match to a tab item.
if (string.IsNullOrEmpty(dlgName))
{
return(false);
}
IntPtr hwndParent = Misc.GetParent(hwnd);
if (hwndParent == IntPtr.Zero)
{
return(false);
}
hwndTab = Misc.FindWindowEx(hwndParent, IntPtr.Zero, "SysTabControl32", null);
// if the tab control is invisible then the tab control is not there.
if (hwndTab == IntPtr.Zero || !SafeNativeMethods.IsWindowVisible(hwndTab))
{
return(false);
}
item = WindowsTabItem.GetCurrentSelectedItem(hwndTab);
return(dlgName.Equals(WindowsTabItem.GetName(hwndTab, item, true)));
}
//------------------------------------------------------
//
// Interface IRawElementProviderHwndOverride
//
//------------------------------------------------------
IRawElementProviderSimple IRawElementProviderHwndOverride.GetOverrideProviderForHwnd(IntPtr hwnd)
{
// return the appropriate placeholder for the given hwnd...
// loop over all the tabs to find it.
string sTitle = Misc.ProxyGetText(hwnd);
// If there is no hwnd title there is no way to match to the tab item.
if (string.IsNullOrEmpty(sTitle))
{
return(null);
}
for (int i = 0, c = GetItemCount(_hwnd); i < c; i++)
{
if (sTitle == WindowsTabItem.GetName(_hwnd, i, true))
{
return(new WindowsTabChildOverrideProxy(hwnd, CreateTabItem(i), i));
}
}
return(null);
}