我想让ItemControl中的项水平排列,并使它们填充父控件。
这是我的XAML代码:
<ItemsControl ItemsSource="{Binding AnnualWeatherViewModels}" Visibility="{Binding IsAnnualWeatherViewModels, Converter={StaticResource VisibilityConverter}}">
<ItemsControl.ItemsPanel>
<ItemsPanelTemplate>
<StackPanel Orientation="Horizontal"></StackPanel>
</ItemsPanelTemplate>
</ItemsControl.ItemsPanel>
<ItemsControl.ItemTemplate>
<DataTemplate>
<V:AerosolSimpleWeatherCharacteristicsView DataContext="{Binding}"></V:AerosolSimpleWeatherCharacteristicsView>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
我尝试过两种不同的ItemsControl.ItemsPanel
变体:
<StackPanel Orientation="Horizontal"></StackPanel>
并且:
<DockPanel LastChildFill="False"></DockPanel>
然而,无论是使用
StackPanel
还是DockPanel
,都无法达到预期的效果。 StackPanel
会压缩所有项目,DockPanel
将填满父控件的空间,但最后一个项目将占用大部分空间,或者根据LastChildFill
的值来决定是否填充父空间。
那么,我该如何水平布置ItemsControl
中的项目并使它们填充父控件的空间呢?
最终,我按照答案中建议的创建了这个自定义控件:
public partial class StretchingPanel : Grid
{
public static readonly DependencyProperty OrientationProperty =
DependencyProperty.Register("Orientation", typeof(Orientation), typeof(StretchingPanel), new UIPropertyMetadata(System.Windows.Controls.Orientation.Horizontal));
public static readonly DependencyProperty FillFirstItemProperty =
DependencyProperty.Register("FillFirstItem", typeof(bool), typeof(StretchingPanel), new UIPropertyMetadata(true));
public static readonly DependencyProperty FillFirstItemFactorProperty =
DependencyProperty.Register("FillFirstItemFactor", typeof(double), typeof(StretchingPanel), new UIPropertyMetadata(1.8));
public Orientation Orientation
{
get
{
return (Orientation)GetValue(OrientationProperty);
}
set
{
SetValue(OrientationProperty, value);
}
}
public bool FillFirstItem
{
get
{
return (bool)GetValue(FillFirstItemProperty);
}
set
{
SetValue(FillFirstItemProperty, value);
}
}
public double FillFirstItemFactor
{
get
{
return (double)GetValue(FillFirstItemFactorProperty);
}
set
{
SetValue(FillFirstItemFactorProperty, value);
}
}
protected override void OnVisualChildrenChanged(DependencyObject visualAdded, DependencyObject visualRemoved)
{
if (Orientation == System.Windows.Controls.Orientation.Horizontal)
{
ColumnDefinitions.Clear();
for (int i = 0; i < Children.Count; ++i)
{
var column = new ColumnDefinition();
if (i == 0 && FillFirstItem)
column.Width = new GridLength(FillFirstItemFactor, GridUnitType.Star);
ColumnDefinitions.Add(column);
Grid.SetColumn(Children[i], i);
}
}
else
{
RowDefinitions.Clear();
for (int i = 0; i < Children.Count; ++i)
{
var row = new RowDefinition();
if (i == 0 && FillFirstItem)
row.Height = new GridLength(FillFirstItemFactor, GridUnitType.Star);
RowDefinitions.Add(row);
Grid.SetRow(Children[i], i);
}
}
base.OnVisualChildrenChanged(visualAdded, visualRemoved);
}
public StretchingPanel()
{
InitializeComponent();
}
}
DataContext="{Binding}"
属性是多余的,请将其删除。这相当于以下C#代码:this.DataContext = this.DataContext;
- Federico Berasategui/>
结尾 XAML 元素也是非常方便的。例如,<V:AerosolSimpleWeatherCharacteristicsView DataContext="{Binding}"></V:AerosolSimpleWeatherCharacteristicsView>
可以简化为<V:AerosolSimpleWeatherCharacteristicsView/>
。 - Federico Berasategui