10

我有一个以编程方式加载的自定义弹出窗口（作为用户控件）。我无法将它集中在 x 轴上，只能在垂直方向上。弹出窗口不会添加到 xaml 文件中，但会添加到根窗口中。

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using Windows.Foundation;
using Windows.Foundation.Collections;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
using Windows.UI.Xaml.Controls.Primitives;
using Windows.UI.Xaml.Data;
using Windows.UI.Xaml.Input;
using Windows.UI.Xaml.Media;
using Windows.UI.Xaml.Navigation;
using System.Windows;
using Windows.UI.Core;

// The User Control item template is documented at http://go.microsoft.com/fwlink/?LinkId=234236

namespace QSTLibrary.WIN8.Tools
{
    public sealed partial class CustomProgressRingPopup : UserControl
    {

        public CustomProgressRingPopup()
        {
            this.InitializeComponent();
        }

        public string Text
        {
            get { return (string)GetValue(TextProperty); }
            set { SetValue(TextProperty, value); }
        }

        // Using a DependencyProperty as the backing store for Text.  This enables animation, styling, binding, etc...
        public static readonly DependencyProperty TextProperty = DependencyProperty.Register(
                        "Text", 
                        typeof(string), 
                        typeof(CustomProgressRingPopup),
                        new PropertyMetadata("", OnTextChanged));


        public void OpenPopup()
        {
            this.ParentPopup.IsOpen = true;
        }

        public void ClosePopup()
        {
            this.ParentPopup.IsOpen = false;
        }

        private static void OnTextChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            var instance = d as CustomProgressRingPopup;
            var newValue = e.NewValue as string;
            if (instance != null && newValue != null)
            {
                instance.CustomTextBlock.Text = newValue;
            }
        }

        private void OnPopupLoaded(object sender, RoutedEventArgs e)
        {
            this.ParentPopup.HorizontalOffset = (Window.Current.Bounds.Width - gdChild.ActualWidth) / 2;
            this.ParentPopup.VerticalOffset = (Window.Current.Bounds.Height - gdChild.ActualHeight) / 2;
        }
    }
}

用户控件 xaml：

<UserControl
    x:Class="QSTLibrary.WIN8.Tools.CustomProgressRingPopup"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="using:QSTLibrary.WIN8.Tools"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d"
    d:DesignHeight="300"
    d:DesignWidth="400">

    <Popup x:Name="ParentPopup" HorizontalAlignment="Center" VerticalAlignment="Center" Loaded="OnPopupLoaded">
        <Grid x:Name="gdChild" Height="auto" Width="auto" Background="Blue" Margin="20">
            <Grid.RowDefinitions>
                <RowDefinition/>
            </Grid.RowDefinitions>
            <Grid.ColumnDefinitions>
                <ColumnDefinition/>
                <ColumnDefinition/>
            </Grid.ColumnDefinitions>
            <ProgressRing x:Name="CustomProgressRing" Height="40" Width="40" IsActive="true" Grid.Column="0" Margin="20"/>
            <TextBlock x:Name="CustomTextBlock" Height="auto" Width="auto" FontSize="25" Grid.Column="1" Margin="20"/>
        </Grid>
    </Popup>    
</UserControl>

这是我在外部使用它的方式：

_loginProgressRingPopup.Text = "Logging in";
_loginProgressRingPopup.OpenPopup();
4

4 回答 4

14

我已经在 cs 文件中添加了弹出窗口的 LayoutUpdate 回调，现在可以使用了。

private void OnLayoutUpdated(object sender, object e)
        {
            if(gdChild.ActualWidth == 0 && gdChild.ActualHeight == 0)
            {
                return;
            }

            var coordinates = ParentPopup.TransformToVisual(Window.Current.Content).TransformPoint(new Point(0, 0));            

            double ActualHorizontalOffset = ParentPopup.HorizontalOffset;
            double ActualVerticalOffset = ParentPopup.VerticalOffset;

            double NewHorizontalOffset = ((Window.Current.Bounds.Width - gdChild.ActualWidth) / 2) - coordinates.X;
            double NewVerticalOffset = ((Window.Current.Bounds.Height - gdChild.ActualHeight) / 2) - coordinates.Y;

            if (ActualHorizontalOffset != NewHorizontalOffset || ActualVerticalOffset != NewVerticalOffset)
            {
                this.ParentPopup.HorizontalOffset = NewHorizontalOffset;
                this.ParentPopup.VerticalOffset = NewVerticalOffset;
            }
        }

以及来自 XAML 的弹出窗口：

<Popup x:Name="ParentPopup" LayoutUpdated="OnLayoutUpdated">
于 2013-09-27T12:59:02.267 回答
3

在 UWP Windows 应用商店应用中定位 aPopup并不像想象的那么简单。这就是我最终解决它的方法。LayoutUpdated与其观察事件（这可能导致布局循环），不如观察SizeChanged视图顶层元素的事件并使用它来重新定位它包含的弹出窗口。

在我的情况下，我将对话框定位在窗口的中心，因此使用Window.Current. Popup您还需要转换坐标，因为弹出窗口将根据元素在布局中实际定义的位置使用自己的相对坐标系：

private void MyDialog_SizeChanged(object sender, SizeChangedEventArgs e) {
    var transform = Window.Current.Content.TransformToVisual(_popup);
    Point point = transform.TransformPoint(new Point(0, 0)); // gets the window's (0,0) coordinate relative to the popup

    double hOffset = (Window.Current.Bounds.Width - this.ActualWidth) / 2;
    double vOffset = (Window.Current.Bounds.Height - this.ActualHeight) / 2;

    _popup.HorizontalOffset = point.X + hOffset;
    _popup.VerticalOffset = point.Y + vOffset;
}
于 2016-11-15T19:15:22.953 回答
0

您可以以 XAML 文件为中心：

<Popup x:Name="ParentPopup" PlacementTarget="{Binding ElementName=MainPanel}" Placement="Center" />
于 2013-09-26T16:16:54.793 回答
-1

我修改了 Butzke 的答案，使其更具普遍性：

<Popup PlacementTarget="{Binding RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type Window}}}" Placement="Center" />
于 2015-09-05T18:07:11.447 回答