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),null); public static Readonly DependencyProperty OffsetYProperty = DependencyProperty.Register("OffsetY",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); }
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:
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