/// <summary>
/// Create tab header item container
/// </summary>
private View CreateItemFromTabView(TabItem tabItem)
{
if (tabItem.HeaderTemplate == null && tabItem.Header == null)
{
throw new Exception("TabBar.CreateItemContainer: TabItem HeaderTemplate is null and Header is null or not type of View");
}
IToggable item = null;
// Create container from TabItem.HeaderTemplate
if (tabItem.Header != null && tabItem.Header is View)
{
item = tabItem.Header as IToggable;
}
else
{
View header = tabItem.HeaderTemplate.CreateContent() as View;
Binding bind = new Binding("Header");
bind.Source = tabItem;
header.SetBinding(View.BindingContextProperty, bind);
item = header as IToggable;
}
if (item == null)
{
throw new Exception("TabBar.CreateItem: ItemTemplate is not subclass of ToggleButton");
}
item.IsToggledChanged -= OnIsToggledChanged;
item.IsToggledChanged += OnIsToggledChanged;
return(item as View);
}
/// <summary>
/// Toggle without event raise
/// </summary>
private void Toggle(IToggable toggleButton)
{
if (toggleButton.IsToggled == false)
{
toggleButton.IsToggledChanged -= OnIsToggledChanged;
toggleButton.IsToggled = true;
toggleButton.IsToggledChanged += OnIsToggledChanged;
}
}
/// <summary>
/// Untoggle without event raise
/// </summary>
private void UnToggle(IToggable toggleButton)
{
if (toggleButton.IsToggled)
{
toggleButton.IsToggledChanged -= OnIsToggledChanged;
toggleButton.IsToggled = false;
toggleButton.IsToggledChanged += OnIsToggledChanged;
}
}
/// <summary>
/// Event handler when focused index changes in Source. Update togglebutton.
/// </summary>
private void OnCurrentItemIndexChanged(object sender, int index)
{
IToggable focusedToggleButton = _children[index].Child as IToggable;
if (_currentToggledButton != null && _currentToggledButton != focusedToggleButton)
{
UnToggle(_currentToggledButton);
}
if (focusedToggleButton != _currentToggledButton)
{
_currentToggledButton = focusedToggleButton;
Toggle(focusedToggleButton);
}
}
