protected override FrameworkElement CreateControlCore()
{
FrameworkElement generatedResult = null;
var groupName = this.CommandMetaGroup.Name.Translate();
//尝试查找已经生成的该组的按钮
var splitButton = this.Context.ContainerItems.OfType<SplitButton>()
.FirstOrDefault(btnGroup => btnGroup.Content.Equals(groupName));
//还没有生成，则创建一个新的。
if (splitButton == null)
{
splitButton = new SplitButton()
{
Mode = SplitButtonMode.Dropdown,
Margin = new Thickness(2),
Content = groupName,
};
//只返回刚生成的 SplitButton
generatedResult = splitButton;
}
this.GenerateButtons(splitButton.Items);
return generatedResult;
}
/*
* DependencyPropertyChanged callbacks
*
*/
private static void OnIsContextMenuOpenChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
SplitButton s = (SplitButton)d;
s.EnsureContextMenuIsValid();
if (!s.ContextMenu.HasItems)
{
return;
}
bool value = (bool)e.NewValue;
if (value && !s.ContextMenu.IsOpen)
{
s.ContextMenu.IsOpen = true;
}
else if (!value && s.ContextMenu.IsOpen)
{
s.ContextMenu.IsOpen = false;
}
}