[英]GridSplitter Autosize
我在使用GridSplitter
遇到了問題
簡單示例代碼:
<Grid x:Name="MainGrid">
<Grid.RowDefinitions>
<RowDefinition Height="100"></RowDefinition>
<RowDefinition Height="2"></RowDefinition>
<RowDefinition Height="*"></RowDefinition>
</Grid.RowDefinitions>
<Grid x:Name="TopGrid" Grid.Row="0" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Background="Red"/>
<GridSplitter ResizeDirection="Rows" Grid.Row="1" VerticalAlignment="Stretch" HorizontalAlignment="Stretch" Height="2" Background="Black" />
<Grid x:Name="BottomGrid" Grid.Row="2" HorizontalAlignment="Stretch" Background="Aquamarine" VerticalAlignment="Stretch"/>
</Grid>
這將創建兩個由GridSplitter
垂直分隔的網格。
我想要實現的是, GridSplitter
自動對齊網格的內容。 例如,如果我在底部網格中有一個可折疊元素,我希望頂部網格在折疊元素時變得更大。 如果我展開它,頂部的Grid
應該會變小。
我該怎么做呢? 稍后我將有 4 個帶有 3 個GridSplitter
的Grids
......所以該解決方案也應該與多個GridSplitter
一起使用。
[編輯]:
我的 xaml:
<Grid x:Name="MainGrid">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*"/>
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="100">
<RowDefinition.MinHeight>
<MultiBinding Converter="{StaticResource ResourceKey=MultiValueConverter}">
<Binding ElementName="dgStapelliste" Path="ActualHeight"></Binding>
</MultiBinding>
</RowDefinition.MinHeight>
</RowDefinition>
<RowDefinition Height="1"></RowDefinition>
<RowDefinition Height="*"></RowDefinition >
</Grid.RowDefinitions>
<Grid Grid.Row="0" Grid.Column="0" x:Name="Test">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*"/>
<ColumnDefinition Width="200"/>
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="*"/>
</Grid.RowDefinitions>
<WPF:DataGrid GridHeaderContent="{Binding StapelListe.HeaderText}" SelectedItem="{Binding StapelListe.SelectedItem}" Grid.Row="0" Grid.Column="0" x:Name="dgStapelliste" HorizontalAlignment="Stretch" ItemsSource="{Binding StapelListe, Mode=OneWay, UpdateSourceTrigger=PropertyChanged}"/>
<WPF:DataGrid GridHeaderContent="{Binding EinzelListe.HeaderText}" Grid.Row="0" Grid.Column="1" x:Name="dgEinzelliste" HorizontalAlignment="Stretch" ItemsSource="{Binding EinzelListe, Mode=OneWay}"/>
<GridSplitter Grid.Column="0" Width="1" VerticalAlignment="Stretch" Background="Black" />
</Grid>
<Grid Grid.Row="2" Grid.Column="0" Grid.RowSpan="2">
<Grid.RowDefinitions>
<RowDefinition Height="*"/>
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*"/>
<ColumnDefinition Width="200"/>
</Grid.ColumnDefinitions>
<WPF:DataGrid GridHeaderContent="{Binding Anforderungsliste.HeaderText}" Grid.Column="0" x:Name="dgAnforderungsliste" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" ItemsSource="{Binding Anforderungsliste, Mode=OneWay}"/>
<GridSplitter Grid.Column="0" Width="1" VerticalAlignment="Stretch" Background="Black" />
</Grid>
<GridSplitter Grid.Column="0" Grid.Row="1" Height="1" ResizeDirection="Rows" VerticalAlignment="Stretch" HorizontalAlignment="Stretch" Background="Black" x:Name="testSplitter" />
</Grid>
您可以使用 MultiBinding 來實現您想要的。
對於每個 RowDefinition,您設置一個 MinHeight,它綁定到它的內容 ActualHeight,如下所示:
<RowDefinition Height="100">
<RowDefinition.MinHeight>
<MultiBinding Converter="{StaticResource ResourceKey=CalcAll}">
<Binding ElementName="firstElementInThisRow" Path="ActualHeight"></Binding>
<Binding ElementName="secondElementInThisRow" Path="ActualHeight"></Binding>
<Binding ElementName="thirdElementInThisRow" Path="ActualHeight"></Binding>
<Binding ElementName="fourthElementInThisRow" Path="ActualHeight"></Binding>
</MultiBinding>
</RowDefinition.MinHeight>
</RowDefinition>
您的轉換器可能如下所示:
public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
{
double result = 0.0;
foreach (object item in values)
{
result += System.Convert.ToDouble(item);
}
return result;
}
public object[] ConvertBack(object values, Type[] targetType, object parameter, CultureInfo culture)
{
return null;
}
每次展開控件時,它的 ActualHeight 都會發生變化,並且 Binding 會更新 -> 父 RowDefinition 的 MinHeight 發生變化。
但是如果控件 VerticalAlignment 為 Stretch,則不能設置一個,因為這樣 ActualHeight 不會因擴展而改變。
編輯:由於我現在能想到的唯一屬性是 DesiredSize.Height 屬性,您不能使用 Binding(如果 DesiredSize.Height 值更改,則綁定不會更新)。 但也許您可以使用 double 類型的屬性(我們稱之為 MinHeightRowOne),它會在它的 setter 中引發 PropertyChanged 事件並綁定到第一行 MinHeight(每行一個屬性):
public double _minHeightRowOne;
public double MinHeightRowOne
{
get
{
return _minHeightRowOne;
}
set
{
_minHeightRowOne = value;
OnPropertyChanged("MinHeightRowOne");
}
}
public event PropertyChangedEventHandler PropertyChanged;
public void OnPropertyChanged(string name)
{
if (PropertyChanged != null)
{
PropertyChanged(this, new PropertyChangedEventArgs(name));
}
}
<RowDefinition Height="100" MinHeight="{Binding Path=MinHeightRowOne}"/>
現在將此 EventHandler 添加到第一行中每個控件的 SizeChanged-Event(每行一個處理程序):
private List<KeyValuePair<string,double>> oldVals = new List<KeyValuePair<string,double>>();
private void ElementInRowOneSizeChanged(object sender, SizeChangedEventArgs e)
{
FrameworkElement elem = (FrameworkElement)sender;
MinHeightRowOne -= oldVals.Find(kvp => kvp.Key == elem.Name).Value;
elem.Measure(new Size(int.MaxValue, int.MaxValue));
MinHeightRowOne += elem.DesiredSize.Height;
oldVals.Remove(oldVals.Find(kvp => kvp.Key == elem.Name));
oldVals.Add(new KeyValuePair<string, double>(elem.Name, elem.DesiredSize.Height));
}
通過這種方式,每次控件的大小更改(應該包括展開或折疊項目)時,行的 MinHeight 都會更新。
請注意,每個控件都必須有一個唯一的名稱才能使其工作。
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