Question

我正在尝试将Popup置于Windows应用商店/ UWP应用中心。

简而言之，我正在使用MainPage并添加...

带有一些文字的TextBlock
带有事件处理程序Button

Button_Click

名为Popup的{{1}}。它包含...
- A popupTest ...
  - A Border
    - A StackPanel
    - A TextBlock。此Button的事件句柄将Button的{{1}}设置为false。

Popup调用IsOpen，尝试将Button_Click置于中心位置，然后将_centerPopup设置为Popup。我无法让它发挥作用。

IsOpen

如果我没有尝试在Button_Click中调整Popup的大小和中心，这就是点击“Click Me”后我得到的内容......

true

Click Me clicked, no resizing or centering

如果我取消注释_ private void _centerPopup(Popup popup, Border popupBorder, FrameworkElement extraElement = null) { double ratio = .9; // How much of the window the popup fills, give or take. (90%) Panel pnl = (Panel)popup.Parent; double parentHeight = pnl.ActualHeight; double parentWidth = pnl.ActualWidth; // Min 200 for each dimension. double width = parentWidth * ratio > 200 ? parentWidth * ratio : 200; double height = parentHeight * ratio > 200 ? parentHeight * ratio : 200; popup.Width = width; popup.Height = height; //popup.HorizontalAlignment = HorizontalAlignment.Center; popup.VerticalAlignment = VerticalAlignment.Top; // <<< This is ignored?! // Resize the border too. Not sure how to get this "for free". popupBorder.Width = width; popupBorder.Height = height; // Not using this here, but if there's anything else that needs resizing, do it. if (null != extraElement) { extraElement.Width = width; extraElement.Height = height; } }的调用，我会得到此消息，弹出窗口按下按钮：

private void Button_Click(object sender, RoutedEventArgs e) { //_centerPopup(this.popupTest, this.popupTestBorder); this.popupTest.IsOpen = true; }

这不好。我thought centerPopup会修复此问题。

FrameworkElement.VerticalAlignment属性

获取或设置在父元素（如面板或项控件）中组合时应用于此元素的垂直对齐特征。

将弹出窗口移动到StackPanel的顶部？

奇怪的是，如果我将Popup移动到StackPanel的顶部，它实际上会在显示后将其他控件向下推。

点击“点击我”，不用 private void Button_Click(object sender, RoutedEventArgs e) { _centerPopup(this.popupTest, this.popupTestBorder); this.popupTest.IsOpen = true; }：

看起来很有前途！它很好地浮动在其他控件上，并且在关闭后对布局没有明显的影响。

但是，即使在将popup.VerticalAlignment = VerticalAlignment.Top;设置为_centerPopup并将其设置为_centerPopup之后，也会添加回VerticalAlignment，而且事情会死于可怕的，火热的死亡。

看起来很完美 直到您发现其他所有控件都被推下 。 ??? 点击“点击关闭”之后的：

永久按下其他控件。为什么会这样？弹出窗口不应该像我调整大小之前那样浮动吗？

完整来源

XAML

Top

完整的MainPage.xaml.cs代码

<Page x:Class="PopupPlay.MainPage" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:local="using:PopupPlay" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" mc:Ignorable="d"> <StackPanel Name="StackMain"> <TextBlock> This is some text<LineBreak /> This is some text<LineBreak /> This is some text<LineBreak /> This is some text<LineBreak /> </TextBlock> <Button Click="Button_Click" Content="Click Me"></Button> <Popup x:Name="popupTest"> <Border Name="popupTestBorder" Background="{StaticResource ApplicationPageBackgroundThemeBrush}" BorderBrush="{StaticResource ApplicationForegroundThemeBrush}" BorderThickness="2"> <StackPanel HorizontalAlignment="Center" VerticalAlignment="Center"> <TextBlock Name="txtPopup" Text="This is some text" FontSize="24" HorizontalAlignment="Center" /> <Button Name="btnClose" Click="btnClose_Click" Content="Click to close"></Button> </StackPanel> </Border> </Popup> </StackPanel> </Page>

有几个问题似乎有关。我没有看到可行的解决办法。（注意：这些并非都是特定于UWP的。）

Center Popup in XAML

Place Popup at top right corner of a window in XAML

How to set vertical offset for popup having variable height

痛苦地说，当它位于一个带有Pivot的更复杂的网格中时，这个相同的设置在我的另一个应用程序中工作，但我看到pivots are buggy。

Wpf的using Windows.UI.Xaml; using Windows.UI.Xaml.Controls; using Windows.UI.Xaml.Controls.Primitives; namespace PopupPlay { /// <summary> /// An empty page that can be used on its own or navigated to within a Frame. /// </summary> public sealed partial class MainPage : Page { public MainPage() { this.InitializeComponent(); } private void Button_Click(object sender, RoutedEventArgs e) { _centerPopup(this.popupTest, this.popupTestBorder); this.popupTest.IsOpen = true; } private void _centerPopup(Popup popup, Border popupBorder, FrameworkElement extraElement = null) { double ratio = .9; // How much of the window the popup fills, give or take. (90%) Panel pnl = (Panel)popup.Parent; double parentHeight = pnl.ActualHeight; double parentWidth = pnl.ActualWidth; // Min 200 for each dimension. double width = parentWidth * ratio > 200 ? parentWidth * ratio : 200; double height = parentHeight * ratio > 200 ? parentHeight * ratio : 200; popup.Width = width; popup.Height = height; //popup.HorizontalAlignment = HorizontalAlignment.Center; popup.VerticalAlignment = VerticalAlignment.Top; // <<< This is ignored?! // Resize the border too. Not sure how to get this "for free". popupBorder.Width = width; popupBorder.Height = height; // Not using this here, but if there's anything else that needs resizing, do it. if (null != extraElement) { extraElement.Width = width; extraElement.Height = height; } } private void btnClose_Click(object sender, RoutedEventArgs e) { this.popupTest.IsOpen = false; } } }内容sounds promising，但在UWP-land中不存在。

Answer 1

您的Popup位于垂直StackPanel内，这意味着StackPanel会将弹出窗口与面板的其他子元素放在一起，这就是它向下推文本的原因。

此外，面板忽略了VerticalAlignment，因为面板为弹出窗口的大小分配了足够的垂直空间，因此没有空间在空间内垂直对齐弹出窗口它被分配了。

我建议使用Grid作为Page的根元素，并将StackPanel和Popup直接放在Grid内，就像这样：

<Grid>
    <StackPanel Name="StackMain">
        <TextBlock>
        This is some text<LineBreak />
        This is some text<LineBreak />
        This is some text<LineBreak />
        This is some text<LineBreak />
        </TextBlock>
        <Button Click="Button_Click" Content="Click Me"></Button>
    </StackPanel>
    <Popup x:Name="popupTest">
        <Border
                Name="popupTestBorder"
                Background="{StaticResource ApplicationPageBackgroundThemeBrush}"
                BorderBrush="{StaticResource ApplicationForegroundThemeBrush}"
                BorderThickness="2">
            <StackPanel HorizontalAlignment="Center" VerticalAlignment="Center">
                <TextBlock Name="txtPopup"
                           Text="This is some text"
                           FontSize="24"
                           HorizontalAlignment="Center" />
                <Button Name="btnClose"
                        Click="btnClose_Click"
                           Content="Click to close"></Button>
            </StackPanel>
        </Border>
    </Popup>
</Grid>

当您想要重叠元素或多个不影响任何其他子元素的位置和大小的元素时，

Grid对此有用。您希望弹出窗口的布局与堆栈面板及其子窗体的布局分开，因此您应该按原样组织XAML。

Answer 2

尝试更改您的xaml，如下所示......

<Page...>
    <Grid x:Name="LayoutRoot">
        <Popup>
        </Popup>

        <Grid x:Name="ContentPanel">
        </Grid>
    </Grid>
</Page>

所以将Popup控件移到内容区域之外，并将stacklayout与ContentPanel Grid中的所有内容放在一起（如上面的代码示例所示）

那应该停止推动其他控制......

UWP XAML Popup不尊重VerticalAlignment？

将弹出窗口移动到StackPanel的顶部？

完整来源

2 个答案: