动态更改按钮的可视状态及VisualTreeHelper的使用

 

 

在做项目的过程中，遇到一个需求：动态更listbox中某一按钮的可视状态，用到的知识点有两个

1。VisualStateManager.GoToState(Control control, string stateName, bool useTransitions);  

2.VisualTreeHelper.GetChild(DependencyObject reference, int childIndex)

 我的listbox代码如下：

 

<ListBox x:Name="lboxTeamNature" VerticalAlignment="Top" Grid.Column="0"  Height="480">
                    <ListBox.Template>
                        <ControlTemplate>
                            <ScrollViewer  Height="480" BorderThickness="0" VerticalScrollBarVisibility="Auto">
                                <ItemsPresenter />
                            </ScrollViewer>
                        </ControlTemplate>
                    </ListBox.Template>
                    <ListBox.ItemsPanel>
                        <ItemsPanelTemplate>
                            <controlsToolkit:WrapPanel  HorizontalAlignment="Left" ItemWidth="110" VerticalAlignment="Top">
                            </controlsToolkit:WrapPanel>
                        </ItemsPanelTemplate>
                    </ListBox.ItemsPanel>
                    <ListBox.ItemTemplate>
                        <DataTemplate>
                        <Button Name="btnSelected" Click="btnSelected_Click"  Margin="5,10" Loaded="btnSelected_Loaded"  Style="{StaticResource ButtonStyle4}" Width="90" Height="70" HorizontalAlignment="Center" VerticalAlignment="Center">
                                <Button.Content>
                                    <StackPanel>
                                    <Image Width="48" Height="48" Source="{Binding IsUse,Converter={StaticResource ConvertIsUse},Mode=OneTime}"></Image>
                                        <TextBlock Text="{Binding Name}" TextAlignment="Center" HorizontalAlignment="Center" />
                                    <!--<TextBlock Text="{Binding IsUse,Converter={StaticResource ConvertIsUse}}" Foreground="{Binding IsUse,Converter={StaticResource ConvertToColor}}"/>-->

                                    <!--<StackPanel Orientation="Vertical">
                                            <StackPanel Orientation="Horizontal">
                                                <TextBlock Text="名称：" />
                                                <TextBlock Text="{Binding Name}" />
                                            </StackPanel>
                                            <StackPanel Orientation="Horizontal">
                                                <TextBlock Text="代码：" />
                                                <TextBlock Text="{Binding Code}" />
                                            </StackPanel>
                                            <StackPanel Orientation="Horizontal">
                                                <TextBlock Text="状态：" />
                                                <TextBlock Text="{Binding IsUse,Converter={StaticResource ConvertBoolToString}}" Foreground="{Binding IsUse,Converter={StaticResource ConvertToColor}}"/>
                                            </StackPanel>
                                    </StackPanel>-->
                                </StackPanel>
                                </Button.Content>
                            </Button>
                        </DataTemplate>
                    </ListBox.ItemTemplate>
                </ListBox>

 

 

为了设置其中一项的按钮的可视状态，写出了下面这些垃圾代码。

我感觉这样是不值的，可没办法，这是经理要求的结果，哪位有更好的解决方法请留言，共同学习学习。^_^

ScrollViewer scrollViewer = (VisualTreeHelper.GetChild(this.lboxTeamNature, 0) as ScrollViewer);
                Border border = VisualTreeHelper.GetChild(scrollViewer, 0) as Border;
                Grid grid = VisualTreeHelper.GetChild(border, 0) as Grid;
                ScrollContentPresenter scrollContentPresenter = VisualTreeHelper.GetChild(grid, 0) as ScrollContentPresenter;
                ItemsPresenter itemsPresenter = VisualTreeHelper.GetChild(scrollContentPresenter, 0) as ItemsPresenter;
                System.Windows.Controls.WrapPanel wrapPanel = VisualTreeHelper.GetChild(itemsPresenter, 0) as System.Windows.Controls.WrapPanel;
                ListBoxItem listBoxItem = VisualTreeHelper.GetChild(wrapPanel, index) as ListBoxItem;
                Grid listBoxItemgrid = VisualTreeHelper.GetChild(listBoxItem, 0) as Grid;
                ContentPresenter contentPresenter = VisualTreeHelper.GetChild(listBoxItemgrid, 2) as ContentPresenter;
                Button btn = VisualTreeHelper.GetChild(contentPresenter, 0) as Button;
                VisualStateManager.GoToState(btn, stateName, true);