internal GroupManager this[IntPtr hwnd]
{
get
{
if (!WindowsListView.IsGroupViewEnabled(hwnd))
{
// Group was disabled but we did not get the needed event
// since for some things events are not being sent
// (e.g: Going from some LV modes to - List mode, List mode does not have Groups)
// alexsn @
throw new InvalidOperationException(SR.Get(SRID.OperationCannotBePerformed));
}
// The group may have been discarded by the reorder winevent.
EnsureCreation(hwnd);
GroupManager manager = _groupManagers[hwnd] as GroupManager;
if (manager == null)
{
// E.G. Going from the List mode to the something that has Group will cause this
// alexsn @
throw new InvalidOperationException(SR.Get(SRID.OperationCannotBePerformed));
}
return(manager);
}
}
internal GroupManager this[IntPtr hwnd]
{
get
{
if (!WindowsListView.IsGroupViewEnabled(hwnd))
{
// Group was disabled but we did not get the needed event
// since for some things events are not being sent
// (e.g: Going from some LV modes to - List mode, List mode does not have Groups)
// Microsoft - We may want to consider raising the event here
// The M7 work on checking if LE is valid however is the better way of going
// WindowsListView.RemoveGroupAndRaiseLogicalChangedEvent(_hwnd);
throw new InvalidOperationException(SR.Get(SRID.OperationCannotBePerformed));
}
// The group may have been discarded by the reorder winevent.
EnsureCreation(hwnd);
GroupManager manager = _groupManagers[hwnd] as GroupManager;
if (manager == null)
{
// E.G. Going from the List mode to the something that has Group will cause this
// Microsoft- We may want to consider raising the event here
// The M7 work on checking if LE is valid however is the better way of going
// WindowsListView.RaiseLogicalChangedEvent(hwnd);
throw new InvalidOperationException(SR.Get(SRID.OperationCannotBePerformed));
}
return(manager);
}
}
//------------------------------------------------------
//
// Patterns Implementation
//
//------------------------------------------------------
#region ProxySimple Interface
// Returns a pattern interface if supported.
internal override object GetPatternProvider(AutomationPattern iid)
{
if (iid == GridPattern.Pattern)
{
return(this);
}
else if (iid == ExpandCollapsePattern.Pattern && WindowsListView.IsGroupViewEnabled(_hwnd))
{
return(this);
}
return(null);
}
// retrieve an id of the group to which this lvitem belongs
// valid only if lv has groups enabled
static internal int GetGroupID(IntPtr hwnd, int lvItem)
{
System.Diagnostics.Debug.Assert(WindowsListView.IsGroupViewEnabled(hwnd), "GetGroupID: called when lv does not have groups");
NativeMethods.LVITEM_V6 item = new NativeMethods.LVITEM_V6();
item.mask = NativeMethods.LVIF_GROUPID;
item.iItem = lvItem;
if (XSendMessage.GetItem(hwnd, ref item))
{
return(item.iGroupID);
}
return(-1);
}
