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1.问题：最近手上有个项目，需要用到wpf, wpf没有silverlight的childwindow, 这样弹窗口不是很方便
2.解决办法：整合了一下网上意见，得到解决办法如下：
public static class ChildWindowBehaviorRegist
{
public static void Show(this FrameworkElement control)
{
Grid grid = GetRootGrid(control );
RootAndMask ram = GetRootAndMask(control);
if (grid != null && ram !=null )
{
DoubleAnimation opacityAnimation = new DoubleAnimation(0.5, new Duration(TimeSpan.FromSeconds(0.5)));
Storyboard opacityBoard = new Storyboard();
opacityBoard.Children.Add(opacityAnimation);
Storyboard.SetTarget(opacityAnimation, ram.MaskRectangle );
Storyboard.SetTargetProperty(opacityAnimation, new PropertyPath("(Opacity)"));
opacityBoard.Completed += delegate
{
ScaleTransform scaleTransform = new ScaleTransform(0.0, 0.0, control.Width / 2.0, control.Height / 2.0);
control.RenderTransform = scaleTransform;
grid.Children.Add(control);
Storyboard scaleBoard = new Storyboard();
DoubleAnimation scaleXAnimation = new DoubleAnimation(1.0, TimeSpan.FromSeconds(0.5));
scaleBoard.Children.Add(scaleXAnimation);
Storyboard.SetTarget(scaleXAnimation, control);
Storyboard.SetTargetProperty(scaleXAnimation, new PropertyPath("(UIElement.RenderTransform).(ScaleTransform.ScaleX)"));
DoubleAnimation scaleYAnimation = new DoubleAnimation(1.0, TimeSpan.FromSeconds(0.5));
scaleBoard.Children.Add(scaleYAnimation);
Storyboard.SetTarget(scaleYAnimation, control);
Storyboard.SetTargetProperty(scaleYAnimation, new PropertyPath("(UIElement.RenderTransform).(ScaleTransform.ScaleY)"));
scaleBoard.Begin();
};
opacityBoard.Begin();
grid.Children.Add(ram.MaskRectangle);
}
}
public static void Close(this FrameworkElement control)
{
Grid grid = GetRootGrid(control );
RootAndMask ram = GetRootAndMask(control);
if (grid != null)
{
ScaleTransform scaleTransform = new ScaleTransform(1.0, 1.0, control.Width / 2.0, control.Height / 2.0);
control.RenderTransform = scaleTransform;
Storyboard scaleBoard = new Storyboard();
DoubleAnimation scaleXAnimation = new DoubleAnimation(0.0, TimeSpan.FromSeconds(0.5));
scaleBoard.Children.Add(scaleXAnimation);
Storyboard.SetTarget(scaleXAnimation, control);
Storyboard.SetTargetProperty(scaleXAnimation, new PropertyPath("(UIElement.RenderTransform).(ScaleTransform.ScaleX)"));
DoubleAnimation scaleYAnimation = new DoubleAnimation(0.0, TimeSpan.FromSeconds(0.5));
scaleBoard.Children.Add(scaleYAnimation);
Storyboard.SetTarget(scaleYAnimation, control);
Storyboard.SetTargetProperty(scaleYAnimation, new PropertyPath("(UIElement.RenderTransform).(ScaleTransform.ScaleY)"));
scaleBoard.Completed += delegate
{
DoubleAnimation opacityAnimation = new DoubleAnimation(0.5, 0.0, new Duration(TimeSpan.FromSeconds(0.5)));
Storyboard opacityBoard = new Storyboard();
opacityBoard.Children.Add(opacityAnimation);
Storyboard.SetTarget(opacityAnimation, ram.MaskRectangle);
Storyboard.SetTargetProperty(opacityAnimation, new PropertyPath("(Opacity)"));
opacityBoard.Completed += delegate
{
grid.Children.Remove(ram.MaskRectangle);
grid.Children.Remove(control);
};
opacityBoard.Begin();
};
scaleBoard.Begin();
}
}
static RootAndMask GetRootAndMask(FrameworkElement control)
{
if (control == null || control.Tag == null || !(control.Tag is RootAndMask))
return null;
return control.Tag as RootAndMask;
}
static Grid GetRootGrid(FrameworkElement control)
{
RootAndMask ram = GetRootAndMask(control);
FrameworkElement root = ram.Root ;
while (root is FrameworkElement && root.Parent != null)
{
FrameworkElement rootElement = root as FrameworkElement;
if (rootElement.Parent is FrameworkElement)
{
root = rootElement.Parent as FrameworkElement;
}
}
ContentControl contentControl = root as ContentControl;
return contentControl.Content as Grid;
}
}
public class RootAndMask
{
public FrameworkElement Root { get; set; }
public Rectangle MaskRectangle = new Rectangle { Fill = new SolidColorBrush(Colors.DarkGray), Opacity = 0.0 };
public RootAndMask(FrameworkElement root)
{
this.Root = root;
}
}
3.调用：使用很简单，
编写一个user control
Login{.....},
public MainWindow()
{
InitializeComponent();
user = new User();
client = new ChatClient(new InstanceContext(this ));
Login login = new Login(user ,client);
login.Tag = new RootAndMask(this);
login.Show();
}
4.利弊：
4.1 利：范围广， 只要是继承自FrameworkElement 的，你都可以像childwindow一样使用
4.2 弊: main page 需要 <mainpage><grid1><grid2></grid></grid><mainpage> 额外添加一个grid1,用grid2布局。tag被占用了。
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