wpf 按资源中的样式指定网格列和行定义
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Specifying Grid column and row definition by style in resource
提问by Ryszard D?egan
There is an UserControl with the following Grid:
有一个带有以下网格的 UserControl：
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition/>
</Grid.RowDefinitions>
</Grid>
Now I have a Window and there are I would to write something like that:
现在我有一个窗口，我想写这样的东西：
<Window.Resources>
<Style TargetType="Grid">
<Setter Property="RowDefinitions">
<Value>
<RowDefinition Height="*"/>
<RowDefinition/>
</Value>
</Setter>
</Style>
</Window.Resources>
The key part, which doesn't compile is when I want to change Height from Auto to *. How to do this in legal way?
无法编译的关键部分是当我想将高度从 Auto 更改为 *. 如何以合法的方式做到这一点？
In general I have to cases. 1) The first row should stretch and the second should be fixed. 2) Vice versa. Maybe a different panel than Grid could be more relevant?
一般来说，我必须案例。1）第一排应该伸展，第二排应该固定。2）反之亦然。也许与 Grid 不同的面板可能更相关？
回答by Clemens
Grid.RowDefinitionsand Grid.ColumnDefinitionsare no dependency properties, and can't hence be set by a Style.
Grid.RowDefinitions并且Grid.ColumnDefinitions不是依赖属性，因此不能由样式设置。
You may perhaps create a dependency property FirstRowHeightin your UserControl, and bind the Heightof the first RowDefinitionto that property. Later you may set the FirstRowHeightproperty in a Style.
您可能会FirstRowHeight在您的 UserControl 中创建一个依赖属性，并将Height第一个RowDefinition属性绑定到该属性。稍后您可以FirstRowHeight在Style.
<Grid.RowDefinitions>
<RowDefinition Height="{Binding FirstRowHeight,
RelativeSource={RelativeSource Mode=FindAncestor, AncestorType=UserControl}}"/>
<RowDefinition/>
</Grid.RowDefinitions>
The property would look like this:
该属性将如下所示：
public static readonly DependencyProperty FirstRowHeightProperty =
DependencyProperty.Register(
"FirstRowHeight", typeof(GridLength), typeof(YourUserControl));
public GridLength FirstRowHeight
{
get { return (GridLength)GetValue(FirstRowHeightProperty); }
set { SetValue(FirstRowHeightProperty, value); }
}
EDIT: In order to support the simple scenario you describe at the end of your question, you may also just have an IsFirstRowFixeddependency property with a property changed callback that sets the row heights in code:
编辑：为了支持您在问题末尾描述的简单场景，您还可能只有一个IsFirstRowFixed依赖属性，该属性带有一个属性更改回调，用于在代码中设置行高：
<Grid.RowDefinitions>
<RowDefinition x:Name="row1" Height="*"/>
<RowDefinition x:Name="row2" Height="Auto"/>
</Grid.RowDefinitions>
The property:
物业：
public static readonly DependencyProperty IsFirstRowFixedProperty =
DependencyProperty.Register(
"IsFirstRowFixed", typeof(bool), typeof(UserControl2),
new PropertyMetadata((o, e) => ((UserControl2)o).IsFirstRowFixedChanged()));
public bool IsFirstRowFixed
{
get { return (bool)GetValue(IsFirstRowFixedProperty); }
set { SetValue(IsFirstRowFixedProperty, value); }
}
private void IsFirstRowFixedChanged()
{
if (IsFirstRowFixed)
{
row1.Height = GridLength.Auto;
row2.Height = new GridLength(1, GridUnitType.Star);
}
else
{
row1.Height = new GridLength(1, GridUnitType.Star);
row2.Height = GridLength.Auto;
}
}
回答by Mahsh Nikam
XAML code :
XAML 代码：
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="auto"/>
<RowDefinition Height="auto"/>
</Grid.RowDefinitions>
<Grid Grid.Row="1" Style="{StaticResource HeaderHeight}"</>
<Grid Grid.Row="1" Style="{StaticResource FooterHeight}"</>
</>
Styles in Resource dictionary
资源字典中的样式
<Style TargetType="Frame" x:Name="HeaderHeight">
<Setter Property="Height" Value="700"></Setter>
</Style>
<Style TargetType="Grid" x:Name="FooterHeight">
<Setter Property="Height" Value="70"></Setter>
</Style>
