曾经在WP7、WP8下的消息 使用的都是Coding4Fun.Phone.Toolkit里面的ToastPrompt类来实现的。
现在我们来自己做个类似IT之家的这种效果：从右边弹出，经过几秒后会自动消失。
首先明确几个需求：
1.在任何界面都能够弹出此消息
2.可以自定义消息的格式内容以及消息的消失时间
（包括是否含有标题、字体大小、排列…）
3.消息的提示与消失都有动画效果
一、取得当前页面上的某个Panel, 用于在此上面呈现消息：
ContentPresenter、Panel都是继承于 FrameWorkElement的
ContentPresenter: 只能容纳一个元素
继承于Panel 的控件是可以容纳多个子控件的，所以将消息显示在这个上面
Panel popUpParentPanel; //消息在此Panel上弹出
Frame RootVisualFrame; //当前页面的可视根 public Panel PopUpParentPanel
{
get
{
if (popUpParentPanel == null)
{
IEnumerable<ContentPresenter> source = CommonHelper.GetVisualDescendants(this.RootVisualFrame).OfType<ContentPresenter>(); //获取所有ContentPresenter类型的子对象
for (int i = ; i < source.Count<ContentPresenter>(); i++)
{
IEnumerable<Panel> enumerable2 = CommonHelper.GetVisualDescendants(source.ElementAt<ContentPresenter>(i)).OfType<Panel>(); //获取所有Panel类型的子对象
if (enumerable2.Count<Panel>() > )
{
this.popUpParentPanel = enumerable2.First<Panel>(); //选出第一个Panel
break;
}
}
}
return this.popUpParentPanel;
}
}
二、展示Show方法：
bool bLocked; //默认为false public void Show()
{
if (bLocked)
{
return;
}
InitControl(); //有关消息界面的代码略，详细请看后文给出的Demo
if (PopUpParentPanel != null)
{
//添加消息至Panel
if (PopUpParentPanel is StackPanel)
{
PopUpParentPanel.Children.Insert(, toastGrid);
}
else
{
PopUpParentPanel.Children.Add(toastGrid);
}
ShowStoryboard(); //开启动画
bLocked = true;
}
}
获取子元素相关静态类：
public class CommonHelper
{
public static IEnumerable<DependencyObject> GetVisualChildren(DependencyObject element)
{
if (element == null)
{
throw new ArgumentNullException("element");
}
return GetVisualChildrenAndSelfIterator(element).Skip<DependencyObject>();
} public static IEnumerable<DependencyObject> GetVisualDescendants(DependencyObject element)
{
if (element == null)
{
throw new ArgumentNullException("element");
}
return GetVisualDescendantsAndSelfIterator(element).Skip<DependencyObject>(); //去除元素本身
} private static IEnumerable<DependencyObject> GetVisualDescendantsAndSelfIterator(DependencyObject element)
{
Queue<DependencyObject> iteratorVariable0 = new Queue<DependencyObject>();
iteratorVariable0.Enqueue(element);
while (true)
{
if (iteratorVariable0.Count <= )
{
yield break;
}
DependencyObject iteratorVariable1 = iteratorVariable0.Dequeue();
yield return iteratorVariable1;
foreach (DependencyObject obj2 in GetVisualChildren(iteratorVariable1))
{
iteratorVariable0.Enqueue(obj2);
}
}
} private static IEnumerable<DependencyObject> GetVisualChildrenAndSelfIterator(DependencyObject element)
{
yield return element;
int childrenCount = VisualTreeHelper.GetChildrenCount(element);
int childIndex = ;
while (true)
{
if (childIndex >= childrenCount)
{
yield break;
}
yield return VisualTreeHelper.GetChild(element, childIndex);
childIndex++;
}
}
}
三、显示消息动画效果以及添加消息显示完成事件：
public event EventHandler<object> ToastShowComplated; //消息显示完成事件 public void ShowStoryboard()
{
Storyboard sbShow = new Storyboard();
sbShow.Completed += sbShow_Completed; //动画完成后开始计时，时间到后消息消失 //X轴方,向从消息界面一半处开始
DoubleAnimation da = new DoubleAnimation() { From = toastGrid.Width / , To = , Duration = dua };
da.EasingFunction = new CircleEase() { EasingMode = EasingMode.EaseOut };
Storyboard.SetTarget(da, toastTransform);
Storyboard.SetTargetProperty(da, "TranslateTransform.X"); //绑定目标属性和以前有些区别
sbShow.Children.Add(da); //设置透明度从0变为1
DoubleAnimation da1 = new DoubleAnimation() { From = , To = , Duration = dua };
Storyboard.SetTarget(da1, toastGrid);
Storyboard.SetTargetProperty(da1, "FrameworkElement.Opacity");
sbShow.Children.Add(da1); sbShow.Begin(); //开始动画
}
void sbShow_Completed(object sender, object e)
{
IsShow = true;
//计时器开始
timer = new Timer(new TimerCallback(Time_Completed), null, this.TotalHiddenSeconds * , );
if (this.ToastShowComplated != null)
{
ToastShowComplated(this, e);
}
} async void Time_Completed(object e)
{
timer.Dispose();
await Windows.ApplicationModel.Core.CoreApplication.MainView.CoreWindow.Dispatcher.RunAsync(CoreDispatcherPriority.Normal, () =>
{
HideStoryboard();
});
}
隐藏消息动画以及添加消息隐藏完成事件一样的。
四、使用该自定义消息：
private void btnToast_Click(object sender, RoutedEventArgs e)
{
CustomToast toast = new CustomToast() { Message = "这是展示的内容！" };
toast.Show();
}
右边是本篇随笔的Demo:CustomToastSample.rar
