本篇我们将对鼠标指针进行美化，也给它穿上好看点的马甲，对于其样式来源可以选择Image 或Path。可以通过微软的 Expression Design 设计出鼠标指针样式
。
先看看鼠标指针换上新装的效果：
1. 将鼠标指针图片加入Images 文件夹：
2. 在Interactivity 中创建MouseCursor 文件夹，并在其中加入MouseCursorBehavior、NameResolvedEventArgs、NameResolver 类：
3. 在NameResolver 类中，最关键的就是UpdateObjectFromName 方法，它将CursorName 属性与鼠标指针对象结合起来：
private void UpdateObjectFromName(DependencyObject oldObject) { DependencyObject resolvedObject = null; this.ResolvedObject = null; if (this.NameScopeReferenceElement != null) { if (!IsElementLoaded(this.NameScopeReferenceElement)) { this.NameScopeReferenceElement.Loaded +=
new RoutedEventHandler(this.OnNameScopeReferenceLoaded); this.PendingReferenceElementLoad = true; return; } if (!string.IsNullOrEmpty(this.Name)) { FrameworkElement actualNameScopeReferenceElement =
this.ActualNameScopeReferenceElement; if (actualNameScopeReferenceElement != null) { resolvedObject = actualNameScopeReferenceElement.FindName(this.Name)
as DependencyObject; } } } this.HasAttempedResolve = true; this.ResolvedObject = resolvedObject; if (oldObject != this.Object) { this.OnObjectChanged(oldObject, this.Object); } }
4. 在MouseCursorBehavior 类中，存有CursorName、OffsetX、OffsetY 属性，它们将用于在Blend 中对鼠标指针进行设置：
public static readonly DependencyProperty CursorNameProperty = DependencyProperty.Register("CursorName", typeof(string), typeof(MouseCursorBehavior), new PropertyMetadata(new PropertyChangedCallback(OnCursorNameChanged))); public static readonly DependencyProperty OffsetXProperty = DependencyProperty.Register("OffsetX", typeof(double), typeof(MouseCursorBehavior), null); public static readonly DependencyProperty OffsetYProperty = DependencyProperty.Register("OffsetY", typeof(double), typeof(MouseCursorBehavior), null);
以及MouseEnter、MouseLeave、MouseMove 事件：
private void AssociatedObject_MouseEnter(object sender, MouseEventArgs e) { if (!this.IsCursorNameSet) return; FrameworkElement cursor = Cursor as FrameworkElement; cursor.IsHitTestVisible = false; cursor.Visibility = Visibility.Visible; if (CursorStack.Count > 0 && CursorStack.Peek() != cursor) { CursorStack.Peek().Visibility = Visibility.Collapsed; } if (!CursorStack.Contains(cursor)) CursorStack.Push(cursor); AssociatedObject.Cursor = Cursors.None; this.AssociatedObject.MouseMove += new MouseEventHandler(AssociatedObject_MouseMove); } private void AssociatedObject_MouseLeave(object sender, MouseEventArgs e) { if (!this.IsCursorNameSet) return; FrameworkElement cursor = Cursor as FrameworkElement; cursor.Visibility = Visibility.Collapsed; CursorStack.Pop(); if (CursorStack.Count > 0) { CursorStack.Peek().Visibility = Visibility.Visible; } this.AssociatedObject.MouseMove -= new MouseEventHandler(AssociatedObject_MouseMove); AssociatedObject.Cursor = null; } private void AssociatedObject_MouseMove(object sender, MouseEventArgs e) { if (!this.IsCursorNameSet) return; FrameworkElement cursor = Cursor as FrameworkElement; Point mousePosition = e.GetPosition(null); cursor.Margin = new Thickness(mousePosition.X + OffsetX, mousePosition.Y + OffsetY, 0, 0); }
5. 添加好上面三个类并重新编译后，我们回到Blend 中，为UserControl 添加新的Behavior->MouseCursorBehavior：
6. 在LayoutRoot 中添加鼠标指针图片，命名为cursorArrow：
将其放在GameScreen 上方，Left 设为0，Top 设为-50：
7. 选择刚刚添加的MouseCursorBehavior 将CursorName 设为鼠标指针名称cursorArrow，OffsetY 设为50（因为之前它与LayoutRoot有-50的偏差）：
运行程序便可看到新的鼠标指针效果，源代码下载：
