이것은 그리 어렵지 않습니다. 2009 년에 질문을 받았을 때 얼마나 어려웠는지 말할 수는 없었습니다.
이 솔루션을 사용할 때 그리드의 하위에 직접 여백을 직접 설정하면 해당 여백은 디자이너에는 나타나지만 런타임에는 나타나지 않습니다.
이 속성은 Grid, StackPanel, WrapPanel, UniformGrid 또는 기타 Panel의 자손에 적용 할 수 있습니다. 즉각적인 어린이에게 영향을 미칩니다. 아이들은 자신의 컨텐츠의 레이아웃을 관리하기를 원할 것으로 추정됩니다.
PanelExt.cs
public static class PanelExt
{
public static Thickness? GetChildMargin(Panel obj)
{
return (Thickness?)obj.GetValue(ChildMarginProperty);
}
public static void SetChildMargin(Panel obj, Thickness? value)
{
obj.SetValue(ChildMarginProperty, value);
}
/// <summary>
/// Apply a fixed margin to all direct children of the Panel, overriding all other margins.
/// Panel descendants include Grid, StackPanel, WrapPanel, and UniformGrid
/// </summary>
public static readonly DependencyProperty ChildMarginProperty =
DependencyProperty.RegisterAttached("ChildMargin", typeof(Thickness?), typeof(PanelExt),
new PropertyMetadata(null, ChildMargin_PropertyChanged));
private static void ChildMargin_PropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
var target = d as Panel;
target.Loaded += (s, e2) => ApplyChildMargin(target, (Thickness?)e.NewValue);
ApplyChildMargin(target, (Thickness?)e.NewValue);
}
public static void ApplyChildMargin(Panel panel, Thickness? margin)
{
int count = VisualTreeHelper.GetChildrenCount(panel);
object value = margin.HasValue ? margin.Value : DependencyProperty.UnsetValue;
for (var i = 0; i < count; ++i)
{
var child = VisualTreeHelper.GetChild(panel, i) as FrameworkElement;
if (child != null)
{
child.SetValue(FrameworkElement.MarginProperty, value);
}
}
}
}
데모:
MainWindow.xaml
<Grid
local:PanelExt.ChildMargin="2"
x:Name="MainGrid"
>
<Grid.RowDefinitions>
<RowDefinition />
<RowDefinition />
<RowDefinition Height="Auto" />
<RowDefinition Height="Auto" />
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition />
<ColumnDefinition />
</Grid.ColumnDefinitions>
<Rectangle Width="100" Height="40" Fill="Red" Grid.Row="0" Grid.Column="0" />
<Rectangle Width="100" Height="40" Fill="Green" Grid.Row="1" Grid.Column="0" />
<Rectangle Width="100" Height="40" Fill="Blue" Grid.Row="1" Grid.Column="1" />
<Button Grid.Row="2" Grid.Column="0" Click="NoMarginClick">No Margin</Button>
<Button Grid.Row="2" Grid.Column="1" Click="BigMarginClick">Big Margin</Button>
<ComboBox Grid.Row="3" Grid.Column="0" Grid.ColumnSpan="2" />
</Grid>
MainWindow.xaml.cs
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
}
private void NoMarginClick(object sender, RoutedEventArgs e)
{
// In real life, if we wanted to change PanelExt.ChildMargin at runtime, we
// would prefer to bind it to something, probably a dependency property of
// the view. But this will do for a demonstration.
PanelExt.SetChildMargin(MainGrid, null);
}
private void BigMarginClick(object sender, RoutedEventArgs e)
{
PanelExt.SetChildMargin(MainGrid, new Thickness(20));
}
}
