protected override void WndProc(ref Message m)
{
switch ((User32.WM)m.Msg)
{
case WM.GETOBJECT:
WmGetObject(ref m);
return;
case WM.MOUSEMOVE:
if (_childWindowType == ChildWindowType.DropDownList)
{
// Need to track the selection change via mouse over to
// raise focus changed event for the items. Monitoring
// item change in setters does not guarantee that focus
// is properly announced.
object before = _owner.SelectedItem;
DefWndProc(ref m);
object after = _owner.SelectedItem;
// Call the focus event for the new selected item accessible object provided by ComboBoxAccessibleObject.
// If the owning ComboBox has a custom accessible object,
// it should override the logic and implement setting an item focus by itself.
if (before != after && _owner.IsAccessibilityObjectCreated && _owner.AccessibilityObject is ComboBoxAccessibleObject comboBoxAccessibleObject)
{
comboBoxAccessibleObject.SetComboBoxItemFocus();
}
}
else
{
_owner.ChildWndProc(ref m);
}
break;
default:
if (_childWindowType == ChildWindowType.DropDownList)
{
DefWndProc(ref m); // Drop Down window should behave by its own.
}
else
{
_owner.ChildWndProc(ref m);
}
break;
}
}
protected override void WndProc(ref Message m)
{
switch ((User32.WM)m.Msg)
{
case WM.GETOBJECT:
WmGetObject(ref m);
return;
case WM.MOUSEMOVE:
if (_childWindowType == ChildWindowType.DropDownList)
{
// Need to track the selection change via mouse over to
// raise focus changed event for the items. Monitoring
// item change in setters does not guarantee that focus
// is properly announced.
object before = _owner.SelectedItem;
DefWndProc(ref m);
object after = _owner.SelectedItem;
if (before != after)
{
(_owner.AccessibilityObject as ComboBoxAccessibleObject).SetComboBoxItemFocus();
}
}
else
{
_owner.ChildWndProc(ref m);
}
break;
default:
if (_childWindowType == ChildWindowType.DropDownList)
{
DefWndProc(ref m); // Drop Down window should behave by its own.
}
else
{
_owner.ChildWndProc(ref m);
}
break;
}
}
