XAML:我可以按名称引用Grid行或列吗? [英] XAML: Can I refer to a Grid row or column by name?
问题描述
如果我为网格中的每一行和每一列命名,是否可以设置控件的grid.row = Row_Top?我已经定义了StaticResources来引用它,但是是否有转换器或其他方法可以在没有资源的情况下完成此任务?
If I name each row and column in a grid, can I set a control's grid.row="Row_Top"? I have defined StaticResources to refer to it but is there a converter or some other method to accomplish this without the resource?
推荐答案
As据我所知,没有内置方法可以执行此操作...但是,您可以使用标记扩展名来按名称检索行或列:
As far as I know there's no built-in way to do it... however, you could use markup extensions to retrieve a row or column by its name :
[MarkupExtensionReturnType(typeof(int))]
public abstract class GridBandExtensionBase : MarkupExtension
{
public override object ProvideValue(IServiceProvider serviceProvider)
{
if (serviceProvider != null)
{
var target = serviceProvider.GetService(typeof(IProvideValueTarget)) as IProvideValueTarget;
if (target != null)
{
var obj = target.TargetObject as DependencyObject;
if (obj != null)
{
var grid = VisualTreeHelper.GetParent(obj) as Grid;
if (grid != null)
{
return GetBandIndex(grid);
}
}
}
}
return 0;
}
protected abstract int GetBandIndex(Grid grid);
}
public class GridRowExtension : GridBandExtensionBase
{
public GridRowExtension() {}
public GridRowExtension(string rowName)
{
this.RowName = rowName;
}
[ConstructorArgument("rowName")]
public string RowName { get; set; }
protected override int GetBandIndex(System.Windows.Controls.Grid grid)
{
for (int i = 0; i < grid.RowDefinitions.Count; i++)
{
if (grid.RowDefinitions[i].Name == RowName)
{
return i;
}
}
return 0;
}
}
public class GridColumnExtension : GridBandExtensionBase
{
public GridColumnExtension() {}
public GridColumnExtension(string columnName)
{
this.ColumnName = columnName;
}
[ConstructorArgument("columnName")]
public string ColumnName { get; set; }
protected override int GetBandIndex(System.Windows.Controls.Grid grid)
{
for (int i = 0; i < grid.ColumnDefinitions.Count; i++)
{
if (grid.ColumnDefinitions[i].Name == ColumnName)
{
return i;
}
}
return 0;
}
}
您可以按以下方式使用这些扩展名:
You could then use these extensions as follows :
<Button Grid.Row="{my:GridRow Row_Top}"
Grid.Column="{my:GridColumn Column_Right}"
Content="Hello world" />
注意:,如果您在与您相同的程序集中编译这些标记扩展名应用程序,设计人员将无法使用参数调用构造函数(但在运行时可以正常工作)。这是已知错误。如果希望它在设计时起作用,请将标记扩展名放在单独的程序集中,或显式指定RowName / ColumnName属性,如下所示:
NOTE: if you compile these markup extensions in the same assembly as your application, the designer won't be able to call the constructor with a parameter (but it will work fine at runtime). This is a known bug that Microsoft doesn't intend to fix. If you want it to work at design time, put the markup extension in a separate assembly, or specify the RowName/ColumnName properties explicitly, as follows :
<Button Grid.Row="{my:GridRow RowName=Row_Top}"
Grid.Column="{my:GridColumn ColumnName=Column_Right}"
Content="Hello world" />
这篇关于XAML:我可以按名称引用Grid行或列吗?的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!