/// <summary>
/// Builds the visual tree for the AccordionItem control when a new
/// template is applied.
/// </summary>
protected override void OnApplyTemplate()
{
base.OnApplyTemplate();
ExpanderButton = GetTemplateChild(ElementExpanderButtonName) as AccordionButton;
ExpandSite = GetTemplateChild(ElementExpandSiteName) as ExpandableContentControl;
if (VisualTreeHelper.GetChildrenCount(this) > 0)
{
FrameworkElement root = VisualTreeHelper.GetChild(this, 0) as FrameworkElement;
if (root != null)
{
ExpandStoryboard = (from stategroup in
VisualStateManager.GetVisualStateGroups(root)
where stategroup.Name == VisualStates.GroupExpansion
from state in stategroup.States
where state.Name == VisualStates.StateExpanded
select state.Storyboard).FirstOrDefault();
CollapseStoryboard = (from stategroup in
(VisualStateManager.GetVisualStateGroups(root))
where stategroup.Name == VisualStates.GroupExpansion
from state in (stategroup.States)
where state.Name == VisualStates.StateCollapsed
select state.Storyboard).FirstOrDefault();
ExpandStoryboard.Begin();
}
else
{
ExpandStoryboard = null;
CollapseStoryboard = null;
}
}
_interaction.OnApplyTemplateBase();
UpdateVisualState(false);
// the UpdateVisualState will not set the expand or collapse state.
if (IsSelected)
{
Schedule(AccordionAction.Expand);
}
else
{
Schedule(AccordionAction.Collapse);
}
}
/// <summary>
/// Create the storyboard for the collapsed state
/// </summary>
private void GotoCollapsedState(bool useTransitions = true)
{
ExpandStoryboard.Stop();
if (useTransitions)
{
MenuAnimation.From = (_menuHeight.Equals(Double.NaN)) ? GetDesiredControlHeight(MapMenuControl) : _menuHeight;
MenuAnimation.To = 0;
ExpandStoryboard.Begin();
}
else
{
MapMenuControl.Height = 0;
}
}
