internal static void SetValue(string val, IntPtr hwnd, int item)
{
// PerSharp/PreFast will flag this as warning 6507/56507: Prefer 'string.IsNullOrEmpty(val)' over checks for null and/or emptiness.
// An empty strings is valued here, while a null string is not.
// Therefore we can not use IsNullOrEmpty() here, suppress the warning.
#pragma warning suppress 6507
if (val == null)
{
throw new ArgumentNullException("val");
}
if (!WindowsListView.ListViewEditable(hwnd))
{
throw new InvalidOperationException(SR.Get(SRID.ValueReadonly));
}
Misc.SetFocus(hwnd);
// set focus to the item
WindowsListView.SetItemFocused(hwnd, item);
// retrieve edit window
IntPtr hwndEdit = WindowsListView.ListViewEditLabel(hwnd, item);
if (IntPtr.Zero == hwndEdit)
{
throw new InvalidOperationException(SR.Get(SRID.OperationCannotBePerformed));
}
// re-use editbox proxy to do the job
// Note: we will pass null and -1 for some of the parameters
// this is ok, since the only thing that matters to us is an ability to set the text
// and these parameters irrelevant for our task
WindowsEditBox editBox = new WindowsEditBox(hwndEdit, null, -1);
// get value pattern
IValueProvider valueProvider = editBox.GetPatternProvider(ValuePattern.Pattern) as IValueProvider;
// try to set user-provided text
bool setValueSucceeded = false;
try
{
valueProvider.SetValue(val);
setValueSucceeded = true;
}
finally
{
// even if there is a problem doing SetValue need to exit
// editing mode (e.g. cleanup from editing mode).
FinishEditing(setValueSucceeded, hwnd, hwndEdit);
}
// Need to give some time for the control to do all its processing.
bool wasTextSet = false;
for (int i = 0; i < 10; i++)
{
System.Threading.Thread.Sleep(1);
// Now see if the item really got set.
if (val.Equals(ListViewItem.GetText(hwnd, item, 0)))
{
wasTextSet = true;
break;
}
}
if (!wasTextSet)
{
throw new InvalidOperationException(SR.Get(SRID.OperationCannotBePerformed));
}
}
// Sets the focus to this item.
internal override bool SetFocus()
{
// Set the item's state to focused.
return(WindowsListView.SetItemFocused(_hwnd, _item));
}
