DataGridComboBoxColumn -单击即可自动下拉
DataGridComboBoxColumn -单击即可自动下拉
提问于 2011-11-08 05:19:47
我在DataGrid中有一个DataGridComboBoxColum。我希望能够在单元格上单击一次，然后让组合框下拉。目前，我必须点击多次。
<DataGrid AutoGenerateColumns="False" Height="148" HorizontalAlignment="Left" Margin="48,85,0,0" Name ="dg_display" VerticalAlignment="Top" Width="645" CanUserAddRows="False" CanUserDeleteRows="False" ItemsSource="{Binding}" SelectionChanged="DgDisplaySelectionChanged">
<DataGrid.Columns>
<DataGridTextColumn IsReadOnly="True" Header="Symbol" Binding="{Binding Symbol}" />
<DataGridTextColumn IsReadOnly="True" Header="Company ID" Binding="{Binding CompanyID}" />
<DataGridComboBoxColumn IsReadOnly="False" Header="Sector" SelectedValueBinding="{Binding Sector}" DisplayMemberPath="{Binding [0]}" Visibility="Visible" >
<DataGridComboBoxColumn.EditingElementStyle>
<Style TargetType="ComboBox">
<Setter Property="ItemsSource" Value="{Binding SectorList}" />
</Style>
</DataGridComboBoxColumn.EditingElementStyle>
<DataGridComboBoxColumn.ElementStyle>
<Style TargetType="ComboBox">
<Setter Property="ItemsSource" Value="{Binding SectorList}" />
</Style>
</DataGridComboBoxColumn.ElementStyle>
</DataGridComboBoxColumn>
</DataGrid.Columns>
</DataGrid>回答 4
Stack Overflow用户
回答已采纳
发布于 2011-12-01 06:35:36
一键式DataGridComboBoxColumn编辑+一键式CheckboxColumn编辑
另请参阅：https://stackoverflow.com/a/8333704/724944
XAML：
<Style TargetType="{x:Type DataGridCell}">
<EventSetter Event="PreviewMouseLeftButtonDown" Handler="DataGridCell_PreviewMouseLeftButtonDown" />
<EventSetter Event="PreviewTextInput" Handler="DataGridCell_PreviewTextInput" />
</Style>代码隐藏：
private void DataGridCell_PreviewMouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
DataGridCell cell = sender as DataGridCell;
GridColumnFastEdit(cell, e);
}
private void DataGridCell_PreviewTextInput(object sender, TextCompositionEventArgs e)
{
DataGridCell cell = sender as DataGridCell;
GridColumnFastEdit(cell, e);
}
private static void GridColumnFastEdit(DataGridCell cell, RoutedEventArgs e)
{
if (cell == null || cell.IsEditing || cell.IsReadOnly)
return;
DataGrid dataGrid = FindVisualParent<DataGrid>(cell);
if (dataGrid == null)
return;
if (!cell.IsFocused)
{
cell.Focus();
}
if (cell.Content is CheckBox)
{
if (dataGrid.SelectionUnit != DataGridSelectionUnit.FullRow)
{
if (!cell.IsSelected)
cell.IsSelected = true;
}
else
{
DataGridRow row = FindVisualParent<DataGridRow>(cell);
if (row != null && !row.IsSelected)
{
row.IsSelected = true;
}
}
}
else
{
ComboBox cb = cell.Content as ComboBox;
if (cb != null)
{
//DataGrid dataGrid = FindVisualParent<DataGrid>(cell);
dataGrid.BeginEdit(e);
cell.Dispatcher.Invoke(
DispatcherPriority.Background,
new Action(delegate { }));
cb.IsDropDownOpen = true;
}
}
}
private static T FindVisualParent<T>(UIElement element) where T : UIElement
{
UIElement parent = element;
while (parent != null)
{
T correctlyTyped = parent as T;
if (correctlyTyped != null)
{
return correctlyTyped;
}
parent = VisualTreeHelper.GetParent(parent) as UIElement;
}
return null;
}Stack Overflow用户
发布于 2019-01-17 21:19:38
其他两个答案对我都不起作用。不过，对我来说起作用的是以下几点。
<DataGridComboBoxColumn
Header="Example ComboBox"
DisplayMemberPath="Name"
SelectedValuePath="Id">
<DataGridComboBoxColumn.EditingElementStyle>
<Style TargetType="ComboBox">
<Setter Property="IsDropDownOpen" Value="True" />
</Style>
</DataGridComboBoxColumn.EditingElementStyle>
</DataGridComboBoxColumn>我不记得我是从哪里得到这个解决方案的。它可能来自堆栈溢出。如果有人看到了原创来源，请随时发表评论。
Stack Overflow用户
发布于 2016-06-24 13:01:47
我对@surfen的回答有问题，可能是因为很多年后，WPF可能已经发生了很大的变化。看起来DataGrid现在为你做了一些事情，比如当你开始输入时自动编辑一个文本字段。
我对我的组合框列使用DataGridTemplateColumn。该模板的CellTemplate有一个TextBlock。调用BeginEdit，然后调用dispatcher，会导致组合框出现在可视化树中。然后，看起来鼠标单击被发送到组合框，并且它会自动打开。
以下是我对@surfen代码的修改版本：
public static class DataGridExtensions
{
public static void FastEdit(this DataGrid dataGrid)
{
dataGrid.ThrowIfNull(nameof(dataGrid));
dataGrid.PreviewMouseLeftButtonDown += (sender, args) => { FastEdit(args.OriginalSource, args); };
}
private static void FastEdit(object source, RoutedEventArgs args)
{
var dataGridCell = (source as UIElement)?.FindVisualParent<DataGridCell>();
if (dataGridCell == null || dataGridCell.IsEditing || dataGridCell.IsReadOnly)
{
return;
}
var dataGrid = dataGridCell.FindVisualParent<DataGrid>();
if (dataGrid == null)
{
return;
}
if (!dataGridCell.IsFocused)
{
dataGridCell.Focus();
}
if (dataGridCell.Content is CheckBox)
{
if (dataGrid.SelectionUnit != DataGridSelectionUnit.FullRow)
{
if (!dataGridCell.IsSelected)
{
dataGridCell.IsSelected = true;
}
}
else
{
var dataGridRow = dataGridCell.FindVisualParent<DataGridRow>();
if (dataGridRow != null && !dataGridRow.IsSelected)
{
dataGridRow.IsSelected = true;
}
}
}
else
{
dataGrid.BeginEdit(args);
dataGridCell.Dispatcher.Invoke(DispatcherPriority.Background, new Action(() => { }));
}
}
}
public static class UIElementExtensions
{
public static T FindVisualParent<T>(this UIElement element)
where T : UIElement
{
UIElement currentElement = element;
while (currentElement != null)
{
var correctlyTyped = currentElement as T;
if (correctlyTyped != null)
{
return correctlyTyped;
}
currentElement = VisualTreeHelper.GetParent(currentElement) as UIElement;
}
return null;
}
}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/8042743
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