protected override bool GoToStateCore(Control control, FrameworkElement templateRoot, string stateName, VisualStateGroup group, VisualState state, bool useTransitions)
{
if (control == null)
{
control = new ContentControl();
}
if ((group == null) || (state == null))
{
return false;
}
if (!GetUseFluidLayout(group))
{
return base.GoToStateCore(control, templateRoot, stateName, group, state, useTransitions);
}
VisualState currentState = GetCurrentState(group);
if (currentState == state)
{
if (!useTransitions && (LayoutTransitionStoryboard != null))
{
StopAnimations();
}
return true;
}
SetCurrentState(group, state);
Storyboard layoutStoryboard = ExtractLayoutStoryboard(state);
List<OriginalLayoutValueRecord> originalLayoutValues = GetOriginalLayoutValues(group);
if (originalLayoutValues == null)
{
originalLayoutValues = new List<OriginalLayoutValueRecord>();
SetOriginalLayoutValues(group, originalLayoutValues);
}
if (!useTransitions)
{
if (LayoutTransitionStoryboard != null)
{
StopAnimations();
}
base.GoToStateCore(control, templateRoot, stateName, group, state, useTransitions);
SetLayoutStoryboardProperties(control, templateRoot, layoutStoryboard, originalLayoutValues);
return true;
}
if ((layoutStoryboard.Children.Count == 0) && (originalLayoutValues.Count == 0))
{
return base.GoToStateCore(control, templateRoot, stateName, group, state, useTransitions);
}
templateRoot.UpdateLayout();
List<FrameworkElement> targets = FindTargetElements(control, templateRoot, layoutStoryboard, originalLayoutValues, MovingElements);
Dictionary<FrameworkElement, Rect> rectsOfTargets = GetRectsOfTargets(targets, MovingElements);
Dictionary<FrameworkElement, double> oldOpacities = GetOldOpacities(control, templateRoot, layoutStoryboard, originalLayoutValues, MovingElements);
if (LayoutTransitionStoryboard != null)
{
templateRoot.LayoutUpdated -= ExtendedVisualStateManager.control_LayoutUpdated;
StopAnimations();
templateRoot.UpdateLayout();
}
base.GoToStateCore(control, templateRoot, stateName, group, state, useTransitions);
SetLayoutStoryboardProperties(control, templateRoot, layoutStoryboard, originalLayoutValues);
templateRoot.UpdateLayout();
Dictionary<FrameworkElement, Rect> newRects = GetRectsOfTargets(targets, null);
MovingElements = new List<FrameworkElement>();
foreach (FrameworkElement element in targets)
{
if (rectsOfTargets[element] != newRects[element])
{
MovingElements.Add(element);
}
}
foreach (FrameworkElement element2 in oldOpacities.Keys)
{
if (!MovingElements.Contains(element2))
{
MovingElements.Add(element2);
}
}
WrapMovingElementsInCanvases(MovingElements, rectsOfTargets, newRects);
VisualTransition transition = FindTransition(group, currentState, state);
templateRoot.LayoutUpdated += ExtendedVisualStateManager.control_LayoutUpdated;
LayoutTransitionStoryboard = CreateLayoutTransitionStoryboard(transition, MovingElements, oldOpacities);
LayoutTransitionStoryboard.Completed += (sender, args) =>
{
templateRoot.LayoutUpdated -= ExtendedVisualStateManager.control_LayoutUpdated;
StopAnimations();
};
LayoutTransitionStoryboard.Begin();
return true;
}
