c# – 如何设置自定义DataGrid非活动选择颜色?
作者:互联网
我想知道,当包含DataGrid的DataGrid或窗口变为非活动状态时,有没有办法设置自定义DataGrid选择颜色?
例如,这里是DataGrid和ListBox,显示相同的数据.两个控件都有一个选定的项目.最初,DataGrid有输入焦点:
一切看起来都很好 – ListBox中的选定项目显示为灰色.然后,让我们将焦点移到ListBox:
现在DataGrid的行为不正确 – 选择颜色没有改变.
我知道SystemColors.HighlightBrushKey和SystemColors.ControlBrushKey.这个XAML放在窗口的资源中:
<SolidColorBrush x:Key="{x:Static SystemColors.HighlightBrushKey}" Color="BlueViolet"/>
<SolidColorBrush x:Key="{x:Static SystemColors.ControlBrushKey}" Color="DarkGray"/>
但看起来DataGrid忽略了第二个–SystemColors.ControlBrushKey,我希望DataGrid的行为与任何其他控件(ListBox,ComboBox,ListView)一样.
我可以用触发器实现类似的东西:
<Style TargetType="{x:Type DataGridCell}">
<Style.Triggers>
<MultiTrigger>
<MultiTrigger.Conditions>
<Condition Property="IsFocused" Value="False"/>
<Condition Property="IsSelected" Value="True"/>
</MultiTrigger.Conditions>
<Setter Property="Background" Value="DarkGray"/>
</MultiTrigger>
</Style.Triggers>
</Style>
但这个解决方案不完整.首先,它灰色选定但未聚焦的单元格,甚至网格选择单元都是FullRow.第二件事 – 当应用程序窗口失去焦点时,触发器不会触发.
有什么建议?
UPDATE.
这个错误在.NET 4.5中得到修复,因此,它不再是实际的.
解决方法:
我找到了解决方案,但看起来并不优雅.
基本问题是:
> DataGrid.IsFocused永远是假的,因为焦点有
具体细胞,而不是网格本身.
>没有办法确定细胞样式,是否有任何聚焦细胞
在网格中.您只能为当前单元格测试IsFocused.
>数据网格不会在取消激活父窗口时作出反应.
如果数据网格有焦点,唯一的方法是检查DataGrid.CurrentCell属性.不幸的是,它是一个结构体,你无法触发,它会检查{x:Null}的这个属性.
要解决这些问题,我需要两个附加属性.
其中第一个是用于确定网格中是否存在任何聚焦单元.结果必须是bool,源是DataGridCellInfo,所以,首先,必须编写转换器:
[ValueConversion(typeof(DataGridCellInfo), typeof(bool))]
public sealed class DataGridCellInfoToBooleanConverter : IValueConverter
{
public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
if (value == null || value.GetType() != typeof(DataGridCellInfo) || targetType != typeof(bool))
return DependencyProperty.UnsetValue;
// IsValid will be false, if there's no focused cell.
return ((DataGridCellInfo)value).IsValid;
}
public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
return DependencyProperty.UnsetValue;
}
}
附属物:
public static bool GetHasFocusedCell(DependencyObject obj)
{
return (bool)obj.GetValue(HasFocusedCellProperty);
}
public static void SetHasFocusedCell(DependencyObject obj, bool value)
{
obj.SetValue(HasFocusedCellProperty, value);
}
public static readonly DependencyProperty HasFocusedCellProperty = DependencyProperty.RegisterAttached(
"HasFocusedCell",
typeof(bool),
typeof(FocusedCellBehavior),
new UIPropertyMetadata(false));
当网格的父窗口变为inactve时,必须更改第二个附加属性:
public static bool GetIsParentWindowActive(DependencyObject obj)
{
return (bool)obj.GetValue(IsParentWindowActiveProperty);
}
public static void SetIsParentWindowActive(DependencyObject obj, bool value)
{
obj.SetValue(IsParentWindowActiveProperty, value);
}
public static readonly DependencyProperty IsParentWindowActiveProperty = DependencyProperty.RegisterAttached(
"IsParentWindowActive",
typeof(bool),
typeof(FocusedCellBehavior),
new UIPropertyMetadata(false));
现在,让我们在XAML中绑定附加属性:
<!-- A converter to define, is there any focused cell in DataGrid -->
<local:DataGridCellInfoToBooleanConverter x:Key="DataGridCellInfoToBooleanConverter"/>
<DataGrid Grid.Row="0" SelectionUnit="FullRow" SelectionMode="Single"
ItemsSource="{Binding}"
local:FocusedCellBehavior.HasFocusedCell="{Binding CurrentCell, RelativeSource={RelativeSource Mode=Self}, Converter={StaticResource DataGridCellInfoToBooleanConverter}}"
local:FocusedCellBehavior.IsParentWindowActive="{Binding IsActive, RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type Window}}}"/>
接下来,我需要一个单元格样式来设置适当的背景颜色:
<!-- A style of selected cell in DataGrid, when there's no any focused cells in DataGrid -->
<Style TargetType="{x:Type DataGridCell}" x:Key="InactiveSelectedCellStyle">
<Style.Triggers>
<Trigger Property="IsSelected" Value="True">
<Setter Property="Background" Value="{DynamicResource {x:Static SystemColors.ControlBrushKey}}"/>
</Trigger>
</Style.Triggers>
</Style>
以及触发触发器的网格样式,当附加属性将更改其值时:
<!--
A style of DataGrid, that defines a couple of triggers, which being fired
when helper attached properties will change their values
-->
<Style TargetType="{x:Type DataGrid}">
<Style.Triggers>
<Trigger Property="local:FocusedCellBehavior.IsParentWindowActive" Value="False">
<Setter Property="CellStyle" Value="{StaticResource InactiveSelectedCellStyle}"/>
</Trigger>
<Trigger Property="local:FocusedCellBehavior.HasFocusedCell" Value="False">
<Setter Property="CellStyle" Value="{StaticResource InactiveSelectedCellStyle}"/>
</Trigger>
</Style.Triggers>
</Style>
还有更好的解决方案吗?
标签:c,wpf,wpfdatagrid 来源: https://codeday.me/bug/20190625/1288211.html