以编程方式向 UWP 应用添加按钮 [英] Programmatically add buttons to a UWP app

问题描述

假设我的应用有一个按钮可以添加另一个按钮.如果我按下它，另一个按钮应该出现在第一个按钮旁边.此外，新按钮应成为添加新按钮"按钮.

Suppose my app has one button that adds another button. If I press it, another button should appear right next to the first button. Also, the new button should become the "add a new button"-button.

我该怎么做?

我的方法是创建一个 RelativePanel，因为在编辑器中，您可以说将这个放在那个的左边".但是，它找不到在 C# 代码中执行此操作的方法.

My approach was creating a RelativePanel, because in the Editor, you can say "Place this left of that". However, it can't find a way to do that in C# code.

推荐答案

您可以关注 ctron 的评论 并通过在代码中设置附加属性值来完成.示例可能如下所示 - XAML:

You can follow ctron's comment and do it via setting attached property value in the code. The sample can look like this - XAML:

<RelativePanel x:Name="myPanel" Margin="100">
    <Button Content="StartBtn" Click="Button_Click"/>
</RelativePanel>

以及后面的代码:

private void Button_Click(object sender, RoutedEventArgs e)
{
    Button newButton = new Button { Content = "CreatedBtn" };
    newButton.Click += Button_Click;
    RelativePanel.SetLeftOf(newButton,sender);
    myPanel.Children.Add(newButton);
}

这会正常工作，但是如果您单击两次一个按钮，第二个新创建的按钮将与第一次单击创建的按钮重叠.如果这不是所需的行为，您将不得不以其他方式进行，在这种情况下，您需要一个按钮列表.为此，我使用了水平 ListView:

This will work fine, however if you click double times one button, the second new created one will overlap the one created from the first click. If it's not a desired behavior, you will have to do it other way, in that case you need a list of buttons. I've used horizontal ListView for that:

<ListView x:Name="myList">
    <ListView.ItemsPanel>
        <ItemsPanelTemplate>
            <ItemsStackPanel Orientation="Horizontal" ScrollViewer.HorizontalScrollMode="Enabled" ScrollViewer.VerticalScrollMode="Disabled"/>
        </ItemsPanelTemplate>
    </ListView.ItemsPanel>
    <ListView.ItemTemplate>
        <DataTemplate>
            <Button Content="{Binding}" Click="ListButton_Click"/>
        </DataTemplate>
    </ListView.ItemTemplate>
    <x:String>StartBtn</x:String>
</ListView>

private void ListButton_Click(object sender, RoutedEventArgs e)
{
    int index = myList.Items.IndexOf((e.OriginalSource as FrameworkElement).DataContext);
    myList.Items.Insert(index, $"Btn {myList.Items.Count}");
}

这需要一些更多的样式，但应该显示基本的想法.

This need some more styling, but should show the basic idea.

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