WPF 图层管理
玩过phtoshop或者blend的人都知道里面都一个图层管理器，管理图层的遮挡顺序，有置顶层、置底层、置下一层、置上一层四个管理方式。
那么在wof中我们应该怎么玩呢? 请看代码，支持多个图层同时操作。
首先置顶：
private void BringToFront(List<UIElement> CurrentSelection ,UIElementCollection childrens)
{
List<UIElement> selectionSorted = (from item in CurrentSelection
orderby Canvas.GetZIndex(item as UIElement) ascending
select item as UIElement).ToList();
List<UIElement> childrenSorted = (from UIElement item in childrens
orderby Canvas.GetZIndex(item as UIElement) ascending
select item as UIElement).ToList();
int i = 0;
int j = 0;
foreach (UIElement item in childrenSorted)
{
if (selectionSorted.Contains(item))
{
int idx = Canvas.GetZIndex(item);
Canvas.SetZIndex(item, childrenSorted.Count - selectionSorted.Count + j++);
}
else
{
Canvas.SetZIndex(item, i++);
}
}
}
置底类似：
private void SendToBack(List<UIElement> CurrentSelection ,UIElementCollection childrens)
{ List<UIElement> selectionSorted = (from item in CurrentSelection orderby Canvas.GetZIndex(item as UIElement) ascending select item as UIElement).ToList(); List<UIElement> childrenSorted = (from UIElement item in childrens
orderby Canvas.GetZIndex(item as UIElement) ascending select item as UIElement).ToList(); int i = 0; int j = 0; foreach (UIElement item in childrenSorted) { if (selectionSorted.Contains(item)) { int idx = Canvas.GetZIndex(item); Canvas.SetZIndex(item, j++); } else { Canvas.SetZIndex(item, selectionSorted.Count + i++); } } }
置下一层：
private void SendBackward(List<UIElement> CurrentSelection ,UIElementCollection childrens)
{ List<UIElement> ordered = (from item in CurrentSelection orderby Canvas.GetZIndex(item as UIElement) ascending select item as UIElement).ToList(); int count = childrens.Count;
for (int i = 0; i < ordered.Count; i++) { int currentIndex = Canvas.GetZIndex(ordered[i]); int newIndex = Math.Max(i, currentIndex - 1); if (currentIndex != newIndex) { Canvas.SetZIndex(ordered[i], newIndex); IEnumerable<UIElement> it =childrens.OfType<UIElement>().Where(item => Canvas.GetZIndex(item) == newIndex);
foreach (UIElement elm in it) { if (elm != ordered[i]) { Canvas.SetZIndex(elm, currentIndex); break; } } } } }
置上一层：
private void BringForward(List<UIElement> CurrentSelection ,UIElementCollection childrens)
{ List<UIElement> ordered = (from item in CurrentSelection orderby Canvas.GetZIndex(item as UIElement) descending select item as UIElement).ToList(); int count = childrens.Count;
for (int i = 0; i < ordered.Count; i++) { int currentIndex = Canvas.GetZIndex(ordered[i]); int newIndex = Math.Min(count - 1 - i, currentIndex + 1); if (currentIndex != newIndex) { Canvas.SetZIndex(ordered[i], newIndex); IEnumerable<UIElement> it = this.Children.OfType<UIElement>().Where(item => Canvas.GetZIndex(item) == newIndex); foreach (UIElement elm in it) { if (elm != ordered[i]) { Canvas.SetZIndex(elm, currentIndex); break; } } } } }
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