如何单击控制之外解雇时，在Silverlight中弹出？

编程入门行业动态更新时间:2024-10-28 18:34:46

本文介绍了如何单击控制之外解雇时，在Silverlight中弹出？的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！问题描述

在我的Silverlight UI，我有一个按钮，点击时会弹出一些过滤参数的控制。我想这种控制可以隐藏自身，当你点击它的外面。换句话说，它应该类似于组合框的方式发挥作用，但它不是一个组合框（你没有它选择一项）。以下是我正在试图捕捉单击控件之外予以驳回：

公共部分类MyPanel：用户控件 {公共MyPanel（） {的InitializeComponent（）; } 私人无效FilterButton_Click（对象发件人，RoutedEventArgs E） { //切换过滤弹出$ B $的开放状态B FilterPopup.IsOpen = ！FilterPopup.IsOpen; } 私人无效UserControl_Loaded（对象发件人，RoutedEventArgs E） { //捕获所有点击和关闭弹出 App.Current.RootVisual .MouseLeftButtonDown + = {委托 FilterPopup.IsOpen = FALSE; }; } }

不幸的是，事件处理程序的MouseLeftButtonDown 永远不会被解雇。有没有做，当你点击它外面的自动驳回弹出控制的一个行之有效的方法是什么？如果不是，为什么不是我的的MouseLeftButtonDown 处理烧成

解决方案：

我想我会后我的整个解决方案的情况下，其他人发现它有用。在我的顶级视觉，我宣布了弹出一个挡箭牌，是这样的：

<用户控件的xmlns：我=CLR的命名空间：命名空间X：类=Namespace.MainPage的xmlns =http://schemas.microsoft/winfx/2006/xaml/presentation的xmlns ：X =http://schemas.microsoft/winfx/2006/xaml的xmlns：导航=CLR的命名空间：System.Windows.Controls;装配= System.Windows.Controls.Navigation的xmlns：uriMapper =CLR的命名空间：System.Windows.Navigation;装配= System.Windows.Controls.Navigation的xmlns：D =http://schemas.microsoft/expression/blend / 2008年的xmlns：MC =schemas.openxmlformats/markup-compatibility/2006> <网格背景=黑的HorizontalAlignment =拉伸 VerticalAlignment =拉伸> <我：的MyStuff /> <帆布的HorizontalAlignment =拉伸VerticalAlignment =拉伸X：NAME =PopupShield背景=透明WIDTH =自动高度=自动能见度=坍塌/> < /网格和GT; < /用户控件>

然后，我添加了弹出一个扩展方法类，如下：

公共静态类PopupUtils {公共静态无效MakeAutoDismissing（这弹出弹出） { VAR盾=（App.Current.RootVisual为的MainPage）.PopupShield; //每当弹出打开，部署屏蔽 popup.HandlePropertyChanges（ISOPEN，（S，E）=> { shield.Visibility =（布尔）e.NewValue Visibility.Visible：Visibility.Collapsed; } ）; //每当点击屏蔽，关闭该弹出 shield.MouseLeftButtonDown + =（S，E）=> popup.IsOpen = FALSE; } } 公共静态类FrameworkUtils {公共静态无效HandlePropertyChanges（此FrameworkElement元素，弦乐propertyName的， PropertyChangedCallback回调） { //绑定到depedency属性结合b =新的Binding（propertyName的）{源=元}; VAR道具= System.Windows.DependencyProperty.RegisterAttached（ListenAttached+ propertyName的，的typeof（对象）， typeof运算（用户控件），新系统。 Windows.PropertyMetadata（回调））; element.SetBinding（道具，B）; } }

扩展方法使用这样的：

私人无效UserControl_Loaded（对象发件人，RoutedEventArgs E） { FilterPopup.MakeAutoDismissing（）; }

解决方案

你设置背景颜色您RootVisual？

In my Silverlight UI, I have a button that when clicked pops up a control with some filtering parameters. I would like this control to hide itself when you click outside of it. In other words, it should function in a manner similar to a combo box, but it's not a combo box (you don't select an item in it). Here's how I'm trying to capture a click outside of the control to dismiss it:

public partial class MyPanel : UserControl { public MyPanel() { InitializeComponent(); } private void FilterButton_Click(object sender, RoutedEventArgs e) { // Toggle the open state of the filter popup FilterPopup.IsOpen = !FilterPopup.IsOpen; } private void UserControl_Loaded(object sender, RoutedEventArgs e) { // Capture all clicks and close the popup App.Current.RootVisual.MouseLeftButtonDown += delegate { FilterPopup.IsOpen = false; }; } }

Unfortunately, the event handler for MouseLeftButtonDown is never getting fired. Is there a well-established way of making a popup control that auto-dismisses when you click outside of it? If not, why isn't my MouseLeftButtonDown handler firing?

Solution:

I thought I'd post my entire solution in case others find it helpful. In my top-level visual, I declare a "shield" for the popups, like this:

Then, I added an extension method for the Popup class, like this:

public static class PopupUtils { public static void MakeAutoDismissing(this Popup popup) { var shield = (App.Current.RootVisual as MainPage).PopupShield; // Whenever the popup opens, deploy the shield popup.HandlePropertyChanges( "IsOpen", (s, e) => { shield.Visibility = (bool)e.NewValue ? Visibility.Visible : Visibility.Collapsed; } ); // Whenever the shield is clicked, dismiss the popup shield.MouseLeftButtonDown += (s, e) => popup.IsOpen = false; } } public static class FrameworkUtils { public static void HandlePropertyChanges( this FrameworkElement element, string propertyName, PropertyChangedCallback callback) { //Bind to a depedency property Binding b = new Binding(propertyName) { Source = element }; var prop = System.Windows.DependencyProperty.RegisterAttached( "ListenAttached" + propertyName, typeof(object), typeof(UserControl), new System.Windows.PropertyMetadata(callback)); element.SetBinding(prop, b); } }

The extension method is used like this:

private void UserControl_Loaded(object sender, RoutedEventArgs e) { FilterPopup.MakeAutoDismissing(); }