是否有一种简单的方法可以在StackPanel内的项目之间设置默认空间,这样我就不必在每个项目上设置Margin属性了?
答案 0 :(得分:44)
我使用透明分隔符,效果很好:
<Separator Opacity="0" Height="20"/>
您当然可以使用边距,但如果您想更改边距,则必须更新所有元素。
甚至可以在静态资源中设置分隔符样式。
附属财产也可以做到,但我认为这有点过分。
答案 1 :(得分:13)
如果所有控件都相同,那么就像IanR建议的那样,并实现一个捕获该控件的Style。如果不是那么你就不能为基类创建一个默认样式,因为它不起作用。
这种情况的最佳方法是使用非常巧妙的技巧 - 附加属性(也称为WPF4中的行为)
您可以创建一个具有附加属性的类,如下所示:
public class MarginSetter
{
public static Thickness GetMargin(DependencyObject obj)
{
return (Thickness)obj.GetValue(MarginProperty);
}
public static void SetMargin(DependencyObject obj, Thickness value)
{
obj.SetValue(MarginProperty, value);
}
// Using a DependencyProperty as the backing store for Margin. This enables animation, styling, binding, etc...
public static readonly DependencyProperty MarginProperty =
DependencyProperty.RegisterAttached("Margin", typeof(Thickness), typeof(MarginSetter), new UIPropertyMetadata(new Thickness(), CreateThicknesForChildren));
public static void CreateThicknesForChildren(object sender, DependencyPropertyChangedEventArgs e)
{
var panel = sender as Panel;
if (panel == null) return;
foreach (var child in panel.Children)
{
var fe = child as FrameworkElement;
if (fe == null) continue;
fe.Margin = MarginSetter.GetMargin(panel);
}
}
}
现在,要使用它,您需要做的就是将此附加属性附加到您想要的任何面板,如下所示:
<StackPanel local:MarginSetter.Margin="10">
<Button Content="hello " />
<Button Content="hello " />
<Button Content="hello " />
<Button Content="hello " />
</StackPanel>
当然完全可以重复使用。
答案 2 :(得分:0)
已接受的答案不再起作用。但是我使用了该答案,并使用了该答案的作者博客(Elad Katz)编写了一个工作代码(在.Net Core中进行了测试),并在此处复制:
public static class EstablecedorMargen {
public static Thickness GetMargen(DependencyObject objeto) => objeto != null ? (Thickness)objeto.GetValue(PropiedadMargen) : new Thickness();
public static void SetMargen(DependencyObject objeto, Thickness value) => objeto?.SetValue(PropiedadMargen, value);
public static readonly DependencyProperty PropiedadMargen
= DependencyProperty.RegisterAttached("Margen", typeof(Thickness), typeof(EstablecedorMargen), new UIPropertyMetadata(new Thickness(), Cambió));
public static void Cambió(object sender, DependencyPropertyChangedEventArgs e) {
if (!(sender is Panel panel)) return;
panel.Loaded += new RoutedEventHandler(EstablecerMargenControlesHijos);
}
public static void EstablecerMargenControlesHijos(object sender, RoutedEventArgs e) {
if (!(sender is Panel panel)) return;
foreach (var hijo in panel.Children) {
if (!(hijo is FrameworkElement feHijo)) continue;
feHijo.Margin = GetMargen(panel);
}
}
}
然后使用:
<StackPanel local:EstablecedorMargen.Margen="10" >
<Button Content="1" />
<Button Content="2" />
<Button Content="3" />
</StackPanel>
答案 3 :(得分:-1)
我发现在堆栈面板中创建一个网格,然后添加所需数量的列(或行),如下所示:
<StackPanel Grid.Row="1" Grid.Column="0" Height="34" Width="698" Margin="10,5,10,10" Orientation="Horizontal" HorizontalAlignment="Center" VerticalAlignment="Center" >
<Grid Width="698" Margin="0,0,0,0">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*"/>
<ColumnDefinition Width="*"/>
<ColumnDefinition Width="*"/>
</Grid.ColumnDefinitions>
<Button x:Name="StartButton" Content="Start" Grid.Row="0" Grid.Column="0" Style="{StaticResource 3DButton}" HorizontalAlignment="Center" VerticalAlignment="Center" Width="70" Click="StartButton_Click" />
<Button x:Name="HelpButton" Content="Help" Grid.Row="0" Grid.Column="1" Style="{StaticResource 3DButton}" HorizontalAlignment="Center" VerticalAlignment="Center" Width="70" Click="HelpButton_Click" />
<Button x:Name="ExitButton" Content="Exit" Grid.Row="0" Grid.Column="2" Style="{StaticResource 3DButton}" HorizontalAlignment="Center" VerticalAlignment="Center" Width="70" Click="ExitButton_Click" Foreground="Red" />
</Grid>
</StackPanel>