本文整理汇总了C#中Visual.ClearValue方法的典型用法代码示例。如果您正苦于以下问题：C# Visual.ClearValue方法的具体用法？C# Visual.ClearValue怎么用？C# Visual.ClearValue使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类Visual的用法示例。
在下文中一共展示了Visual.ClearValue方法的2个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C#代码示例。
示例1: UpdateAdornedElement
private void UpdateAdornedElement(Visual adorner, Visual adorned)
{
var info = adorner.GetValue(AdornedElementInfoProperty);
if (info != null)
{
info.Subscription.Dispose();
if (adorned == null)
{
adorner.ClearValue(AdornedElementInfoProperty);
}
}
if (adorned != null)
{
if (info == null)
{
info = new AdornedElementInfo();
adorner.SetValue(AdornedElementInfoProperty, info);
}
info.Subscription = this.tracker.Track(adorned).Subscribe(x =>
{
info.Bounds = x;
this.InvalidateArrange();
});
}
}示例2: RootChanged
protected void RootChanged(Visual oldRoot, Visual newRoot)
{
PresentationSource oldSource = null;
if (oldRoot == newRoot)
{
return;
}
// Always clear the RootSourceProperty on the old root.
if (oldRoot != null)
{
oldSource = CriticalGetPresentationSourceFromElement(oldRoot, RootSourceProperty);
oldRoot.ClearValue(RootSourceProperty);
}
// Always set the SourceProperty on the new root.
if (newRoot != null)
{
newRoot.SetValue(RootSourceProperty, new SecurityCriticalDataForMultipleGetAndSet<PresentationSource>(this));
}
UIElement oldRootUIElement = oldRoot as UIElement;
UIElement newRootUIElement = newRoot as UIElement;
// The IsVisible property can only be true if root visual is connected to a presentation source.
// For Read-Only force-inherited properties, use a private update method.
if(oldRootUIElement != null)
{
oldRootUIElement.UpdateIsVisibleCache();
}
if(newRootUIElement != null)
{
newRootUIElement.UpdateIsVisibleCache();
}
// Broadcast the Unloaded event starting at the old root visual
if (oldRootUIElement != null)
{
oldRootUIElement.OnPresentationSourceChanged(false);
}
// Broadcast the Loaded event starting at the root visual
if (newRootUIElement != null)
{
newRootUIElement.OnPresentationSourceChanged(true);
}
// To fire PresentationSourceChanged when the RootVisual changes;
// rather than simulate a "parent" pointer change, we just walk the
// collection of all nodes that need the event.
foreach (DependencyObject element in _watchers)
{
// We only need to update those elements that are in the
// same context as this presentation source.
if (element.Dispatcher == Dispatcher)
{
PresentationSource testSource = CriticalGetPresentationSourceFromElement(element,CachedSourceProperty);
// 1) If we are removing the rootvisual, then fire on any node whos old
// PresetationSource was the oldSource.
// 2) If we are attaching a rootvisual then fire on any node whos old
// PresentationSource is null;
if (oldSource == testSource || null == testSource)
{
UpdateSourceOfElement(element, null, null);
}
}
}
}