I have a custom popup (as a user control) which I load programatically. I'm not able to center it on x axis, only on vertical. The popup is not added onto an xaml file, but it is added on the root window.
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;
}
}
}
userControl 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>
Here is how I use it external:
_loginProgressRingPopup.Text = "Logging in";
_loginProgressRingPopup.OpenPopup();
Positioning a Popup
in a UWP Windows Store app is not as straightforward as it could be. Here is how I ended up solving it. Rather than observing the LayoutUpdated
event (which can cause a layout cycle), observe the SizeChanged
event of the top-level element of your view and use this to reposition the popup it is contained within.
In my case I am positioning the dialog in the center of the window, and thus use Window.Current
. You also need to convert the coordinates, because the popup will use its own relative coordinate system based on where the Popup
element is actually defined in your layout:
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;
}
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