I've got a question about wpf datagrid an the behaviour of a DatagridTemplateColumn.
<DataGrid
ItemsSource="{Binding Items, UpdateSourceTrigger=PropertyChanged, Mode=TwoWay}"
inf:MultiSelectorBehaviours.SynchronizedSelectedItems="{Binding SelectedItems, UpdateSourceTrigger=PropertyChanged, Mode=TwoWay}"
SelectionUnit="FullRow" SelectionMode="Extended">
<DataGrid.Columns>
<DataGridTemplateColumn.CellTemplate>
<DataTemplate>
<Button Background="Transparent"
BorderThickness="0"
BorderBrush="Transparent"
Command="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type UserControl}}, Path=DataContext.ExecuteCommand}" CommandParameter="{Binding}" />
</DataTemplate>
</DataGridTemplateColumn.CellTemplate>
</DataGridTemplateColumn>
</DataGrid.Columns>
My Question is: When i press the button in DataGridTemplateColumn and the row is NOT selected, command is fired in my model. But when select my row first, command is not fired. Does anybody know why?
Thanks for your help...
EDIT: When i change SelectionMode from "Extended" to "Single", it is working as expected. But i have to use "Extended"...
Try IsSynchronizedWithCurrentItem="True" on your datagrid. It's a common cause of why "SelectedItem" related issues arise. Otherwise you should provide a more complete code sample to get a solution to this.
Related
Here it's the following. I want to disable a combo box.
In some scenarios in a window I just set SelectedItem from ViewModel to something and don't allowing the user to change it. But in some cases I want to allow.
This one works perfectly when changing ComboBoxIsEnabled property in VM.
<ComboBox ItemsSource="{Binding MyColletionView, Mode=OneWay}"
SelectedItem="{Binding MySelectedItem, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"
DisplayMemberPath="Name"
IsEnabled="{Binding MyComboBoxIsEnabled}"/>
After changing ComboBox.ItemTemplate the IsEnable property not reacting anymore. In short, I can't disable the ComboBox.
<ComboBox ItemsSource="{Binding MyColletionView, Mode=OneWay}"
SelectedItem="{Binding MySelectedItem, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"
IsEnabled="{Binding MyComboBoxIsEnabled}">
<ComboBox.ItemTemplate>
<DataTemplate>
<TextBlock Text="{Binding Converter={StaticResource CustomerConverter}}"/>
</DataTemplate>
</ComboBox.ItemTemplate>
</ComboBox>
I don't want to disable the ComboBoxItem, I want to disable the ComboBox itsef.
Any suggestions, or someone facing the same issue?
<ComboBox Height="20" Width="200" IsEnabled="True" Margin="38,38,1682,1022" ItemsSource="{Binding SourceData}">
<ComboBox.ItemTemplate>
<DataTemplate>
<TextBlock Text="{Binding}"/>
</DataTemplate>
</ComboBox.ItemTemplate>
</ComboBox>
I write a sample as you described.but I didnot use mvvm.I want to prove that there is no relationship in IsEnable and ItemTemplate.
you can trace this issue from tips as follow.
Watch Output window in VisualStudio.There may be some exception.
replace mvvm with codebehind and try.
In a DataGrid I display data about financial transactions. One column is the Account with the xaml below. The CellEditingTemplate display the ComboBox with the accounts. The CellTemplate is tricky. I want to display the Account as a TextBlock. Previously I bound "Account.Name" but validating a nested property is not easy if Account is null (e.g. in a new row). So I decided to use ComboBox but with a ControlTemplate. Displaying values and validation works. The problem is that for click the CellEditingTemplate is not activated.
<DataGridTemplateColumn Header="{x:Static r:Resource.AccountName}">
<DataGridTemplateColumn.CellTemplate>
<DataTemplate>
<ComboBox ItemsSource="{Binding RelativeSource={RelativeSource FindAncestor,
AncestorType={x:Type DataGrid}}, Path=DataContext.AccountObjects}"
SelectedItem="{Binding Account, ValidatesOnDataErrors=True}"
DisplayMemberPath="Name">
<ComboBox.Template>
<ControlTemplate TargetType="{x:Type ComboBox}">
<TextBlock Text="{TemplateBinding Text}"/>
</ControlTemplate>
</ComboBox.Template>
</ComboBox>
</DataTemplate>
</DataGridTemplateColumn.CellTemplate>
<DataGridTemplateColumn.CellEditingTemplate>
<DataTemplate>
<ComboBox ItemsSource="{Binding RelativeSource={RelativeSource FindAncestor,
AncestorType={x:Type DataGrid}}, Path=DataContext.AccountObjects}"
SelectedItem="{Binding Account, ValidatesOnDataErrors=True}"
DisplayMemberPath="Name"/>
</DataTemplate>
</DataGridTemplateColumn.CellEditingTemplate>
</DataGridTemplateColumn>
I have Datagrid with two TemplateColumn.
First column is a Combobox and Second column with Extended IntergerUpDown control
I need to Enable/Disable the IntegerUpDown control based on the Combox box SelectedItem value.
Please help me how to accomplish this. Sample xaml below.
<Grid><DataGrid ItemsSource="{Binding List1}" Name="x1">
<DataGrid.Columns>
<DataGridTemplateColumn Header="ColorTemplate">
<DataGridTemplateColumn.CellTemplate>
<DataTemplate>
<ComboBox ItemsSource="{Binding DataContext.List2, RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type DataGrid}}}"
DisplayMemberPath="Name" SelectedValue="{Binding ColourId}" SelectedValuePath="Id" Tag="{Binding Id}"
HorizontalAlignment="Stretch" x:Name="discussTemplate" VerticalAlignment="Stretch"
/>
</DataTemplate>
</DataGridTemplateColumn.CellTemplate>
</DataGridTemplateColumn>
<DataGridTemplateColumn Header="UPDown" Width="Auto">
<DataGridTemplateColumn.CellTemplate>
<DataTemplate>
<extToolkit:IntegerUpDown AllowSpin="True" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Width="Auto" Minimum="0"
x:Name="updown"
IsEnabled="????" >
</extToolkit:IntegerUpDown>
</DataTemplate>
</DataGridTemplateColumn.CellTemplate>
</DataGridTemplateColumn>
</DataGrid.Columns>
</DataGrid>
</Grid>
This can be easily done with a DataTrigger on your ViewModel ColourId property.
As your SelectedValue property on the ComboBox is already binded, you can have a DataTrigger on your extToolkit:IntegerUpDown control that will set IsEnabled to True/False based on ColourId value on your ViewModel.
I have a WPF form with a DataGrid. This DG contains a DataGridTemplateColumn that contains a ComboBox. When I click on the new row of the DG and selected a value from the Combobox and then tab to the next column, the selected value does not stay visible in the combobox column.
However, when I tab back, the correct value shows in the combobox.
How do I keep the selected value showing in the combobox column when I tab off the column?
Here is my comboxbox column xaml:
<DataGridTemplateColumn Header="Type" Width="160">
<DataGridTemplateColumn.CellTemplate>
<DataTemplate>
<TextBlock Text="{Binding LocationType.Description, Mode=TwoWay}"/>
</DataTemplate>
</DataGridTemplateColumn.CellTemplate>
<DataGridTemplateColumn.CellEditingTemplate>
<DataTemplate>
<StackPanel Orientation="Horizontal">
<ComboBox Name="cboAddrtype"
ItemTemplate="{StaticResource dtAddrType}" IsSynchronizedWithCurrentItem="True"
ItemsSource="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type UserControl}, AncestorLevel=1}, Path=DataContext.LocationTypesObject, Mode=OneTime}"
SelectedItem="{Binding Path=SelectedLocationType, UpdateSourceTrigger=PropertyChanged, Mode=OneWay}"
SelectedValue="{Binding Path=LocationTypeKey, Mode=TwoWay}"
SelectedValuePath="InternalKey"
Width="100" />
</StackPanel>
</DataTemplate>
</DataGridTemplateColumn.CellEditingTemplate>
In CellTemplate you're binding LocationType.Description and in CellEditingTemplate you're binding SelectedLocationType and LocationTypeKey. I'm not sure that your binding from ComboBox won't somehow affect LocationType.Description.
Furthermore, SelectedLocationType and LocationTypeKey are not in the context of DataTemplate. You should add a Source binding property to get your ViewModel.
First the code:
<ListView ItemsSource="{Binding DataTransferModel.Output}" Background="Transparent" Margin="0" VerticalContentAlignment="Top" AlternationCount="2" Name="lvOutput" ScrollViewer.VerticalScrollBarVisibility="Auto" Grid.Row="2">
<ListView.ItemTemplate>
<DataTemplate>
<StackPanel Orientation="Horizontal" Margin="0,1">
<UserControls:OutputTextBox Text="{Binding Data, Mode=OneWay}"
IsReadOnly="True"
Grid.Row="2"
TextWrapping="WrapWithOverflow"
SelectedValue="{Binding Path=DataContext.SelectedOutput,
Mode=TwoWay,
UpdateSourceTrigger=PropertyChanged,
RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type Grid}}
}"
/>
</StackPanel>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
And the problem is that the property Data on the OutputTextBox control comes from the list, but the property SelectedOutput should come from the main DataContext the ViewModel. And the property SelectedOutput should be the same for every entry in the list. But currently it dosn't work. :(
does your listview is enclosed in tags and if yes does the grid has the DataContext from the ViewModel? if yes it should work.
do you see any binding errors in your output window? maybe you should try using Snoop to see your real binding of SelectedValue.
EDIT: Please try a Type other then Grid, maybe ListView if it has the ViewModel DataContext.
<UserControls:OutputTextBox Text="{Binding Data, Mode=OneWay}"
IsReadOnly="True"
Grid.Row="2"
TextWrapping="WrapWithOverflow"
SelectedValue="{Binding Path=DataContext.SelectedOutput,
Mode=TwoWay,
UpdateSourceTrigger=PropertyChanged,
RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type ListView}}
}"
/>