Question

您好我使用列表框来显示项目列表。在列表框中，我在每个项目上都有一个togglebutton。当我单击切换按钮时，按下了togglebutton的状态。但是当我在列表框中向下滚动并再次抬头时。没有按下togglebutton状态。我该如何防止这种情况请帮忙。

继承我的itemtemplate

<ListBox.ItemTemplate>
<DataTemplate>
        <StackPanel Margin="0,3,0,0">
            <Border BorderBrush="Black" BorderThickness="1,1,1,1">
                <Border.Background>
                    <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0" MappingMode="RelativeToBoundingBox">
                        <GradientStop Color="#FFECECEC" Offset="1"/>
                        <GradientStop Color="#FFE8E8E8"/>
                        <GradientStop Color="#FFBDBDBD" Offset="0.153"/>
                        <GradientStop Color="#FFE8E8E8" Offset="0.904"/>
                    </LinearGradientBrush>
                </Border.Background>
                <Border.Style>
                    <Style>
                        <Style.Triggers>
                            <DataTrigger Binding="{Binding Path=IsSelected, RelativeSource={RelativeSource Mode=FindAncestor,AncestorType={x:Type ListBoxItem}}}" Value="True">
                                <Setter Property="Border.Height" Value="100"/>
                                <Setter Property="Border.Background">
                                    <Setter.Value>
                                        <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0" MappingMode="RelativeToBoundingBox">
                                            <GradientStop Color="DarkGray" Offset="1"/>
                                            <GradientStop Color="#FFE8E8E8"/>
                                            <GradientStop Color="#FFBDBDBD" Offset="0.153"/>
                                            <GradientStop Color="DarkGray" Offset="0.904"/>
                                        </LinearGradientBrush>
                                    </Setter.Value>
                                </Setter>
                            </DataTrigger>
                        </Style.Triggers>
                    </Style>
                </Border.Style>
                <StackPanel Orientation="Horizontal" VerticalAlignment="Center">
                    <Grid>
                        <Grid.ColumnDefinitions>
                            <ColumnDefinition Width="500"/>
                            <ColumnDefinition Width="100"/>
                            <ColumnDefinition Width="55"/>
                        </Grid.ColumnDefinitions>

                        <!--Pick number-->
                        <StackPanel Grid.Column="0" VerticalAlignment="Center" Orientation="Vertical">
                            <TextBlock Text="{Binding Path=FtgNamn}" FontWeight="Bold" FontSize="22pt" FontFamily="Calibri"/>
                            <TextBlock Text="{Binding Path=LevsAttBeskr}" FontSize="18pt" FontFamily="Calibri"/>
                        </StackPanel>

                        <!--Pick Quantity-->
                        <StackPanel Grid.Column="1" VerticalAlignment="Center">
                            <TextBlock Text="{Binding Path=Antal}" FontSize="44pt" FontFamily="Calibri"/>
                        </StackPanel>

                        <!-- Checkbox-->
                        <StackPanel Grid.Column="2" VerticalAlignment="Center" HorizontalAlignment="Center">
                            <ToggleButton Name="Check" Width="40" Height="40" Click="Check_Click" Tag="{Binding Path=Plocklista}">
                                <ToggleButton.Style>
                                    <Style TargetType="ToggleButton">
                                        <Setter Property="Template">
                                            <Setter.Value>
                                                <ControlTemplate TargetType="{x:Type ToggleButton}">
                                                    <Border x:Name="InnerBorder" Background="White" BorderBrush="Black" BorderThickness="1"/>
                                                    <ControlTemplate.Triggers>
                                                        <Trigger Property="IsChecked" Value="True">
                                                            <Setter TargetName="InnerBorder" Property="Background">
                                                                <Setter.Value>
                                                                    <ImageBrush ImageSource="/Images/button_ok.png"/>
                                                                </Setter.Value>
                                                            </Setter>
                                                            <Setter TargetName="InnerBorder" Property="BorderThickness" Value="0"/>
                                                        </Trigger>
                                                    </ControlTemplate.Triggers>
                                                </ControlTemplate>
                                            </Setter.Value>
                                        </Setter>
                                    </Style>
                                </ToggleButton.Style>
                            </ToggleButton>
                        </StackPanel>

                    </Grid>

                    <Border BorderBrush="Darkgray" BorderThickness="0,0,1,0">

                    </Border>
                    <TextBlock Width="100" Text="{Binding Path=Quantity}" FontSize="44pt" FontFamily="Calibri"/>
                    <CheckBox Width="78"/>
                </StackPanel>
            </Border>
        </StackPanel>

</DataTemplate>

继承人的绑定代码

        delegate void FillPickHeaderDelegate(PickHeaderDoc[] pickHeaderDocs);
    private void FillPickList(PickHeaderDoc[] pickHeaderDoc) {
        if(lbAllPickAssignments.Dispatcher.CheckAccess()) {
            lbAllPickAssignments.ItemsSource = pickHeaderDoc;
            lbAllPickAssignments.UnselectAll();
        } else {
            lbAllPickAssignments.Dispatcher.Invoke(new FillPickHeaderDelegate(FillPickList), new object[] { pickHeaderDoc });
        }
    }

继承人点击事件

        private void Check_Click(object sender, RoutedEventArgs e) {
        ToggleButton btn = (ToggleButton) sender;

        if(btn.IsChecked.Value == true) {
            m_checkedList.Add(Convert.ToInt32(btn.Tag));
        } else {
            m_checkedList.Remove(Convert.ToInt32(btn.Tag));
        }

        txtblockPickCount.Text = m_checkedList.Count.ToString();
    }

Answer 1

值是否实际更新了ToggleButton绑定的对象？ WPF中的ListView使用称为虚拟化的东西来仅绘制列表框中可见的部分。这意味着当你的ToggleButton超出范围时，它会在重新进入范围时重新绘制（并重新计算）。

我认为问题在于ToggleButton的click方法或绑定。你能发布更多关于它的细节吗？

Answer 2

在列表框中设置选中的切换按钮后（在Listboxitem中，我有一个Listbox.ScrollIntoView(CountriesListBox.Items[0]);，使我无法在“列表框”中进行选择。

我发现答案是：

Listbox.Items.Refresh();

在ScrollIntoView之前。

Wpf Listbox和Togglebutton

2 个答案: