C# 在项目选择中,更改Windows Phone中ListBoxItem的一部分矩形的颜色
我有一个包含以下XAML的列表框:C# 在项目选择中,更改Windows Phone中ListBoxItem的一部分矩形的颜色,c#,windows-phone-7,windows-phone,C#,Windows Phone 7,Windows Phone,我有一个包含以下XAML的列表框: <ListBox.ItemTemplate> <DataTemplate> <Grid Name="listItemGrid"> <Grid.ColumnDefinitions> <ColumnDefinition MaxWidth="20" MinWidth="20" Width="20" /> <ColumnDefinition /&g
<ListBox.ItemTemplate>
<DataTemplate>
<Grid Name="listItemGrid">
<Grid.ColumnDefinitions>
<ColumnDefinition MaxWidth="20" MinWidth="20" Width="20" />
<ColumnDefinition />
</Grid.ColumnDefinitions>
<Rectangle Name="listItemSideBar" Height="85" HorizontalAlignment="Left"
Margin="0, 0, 0, 0" Stroke="{StaticResource PhoneAccentBrush}"
StrokeThickness="1" VerticalAlignment="Top" Fill="{StaticResource
PhoneAccentBrush}" MinHeight="85" Width="25"/>
<StackPanel Margin="0,0,0,17" Grid.Column="1" Grid.ColumnSpan="2">
<TextBlock Name="listItemMainData" Text="{Binding LineTwo}"
TextWrapping="NoWrap" Margin="12,0,0,0" Style="{StaticResource
PhoneTextExtraLargeStyle}"/>
<TextBlock Name="listItemSubData" Text="{Binding LineOne}"
TextWrapping="NoWrap" Margin="12,-6,0,0"
Style="{StaticResource PhoneTextSubtleStyle}"/>
</StackPanel>
</Grid>
</DataTemplate>
</ListBox.ItemTemplate>
当选择ListBoxItem时,我想将该ListBoxItem的矩形填充颜色更改为其他颜色;取消选择ListBoxItem时,我希望填充颜色改回PhoneAccentBrush
有办法完成这项任务吗?我终于想出了一个解决方案,我在下面复制了这个解决方案。
ColorHelper
类只是从PhoneAccentBrush资源获取PhoneAccentColor。DarkPhoneAcentColor是通过找到的方法生成的PropertyValue(child,“Name”)
是一种语法扩展方法,用于从类型的属性中获取值;如果属性不存在,则返回default(T)
尚未对此代码应用完全错误检查
private void listBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
Color accent = ColorHelper.PhoneAccentColor;
Color accentDark = ColorHelper.DarkPhoneAccentColor;
foreach (object item in e.RemovedItems)
SetListBoxItemColor(item, accentDark);
foreach (object item in e.AddedItems)
SetListBoxItemColor(item, accent);
}
private void SetListBoxItemColor(object item, Color color)
{
ListBoxItem listBoxItem = listBox.ItemContainerGenerator
.ContainerFromItem(item) as ListBoxItem;
if (listBoxItem != null)
{
Rectangle rectangle = GetItemsRecursive<Rectangle>(
listBoxItem, "listItemSideBar");
SolidColorBrush fillBrush = new SolidColorBrush();
fillBrush.Color = color;
rectangle.Fill = fillBrush;
}
}
private T GetItemsRecursive<T>(DependencyObject lb, string name)
where T : DependencyObject
{
int childrenCount = VisualTreeHelper.GetChildrenCount(lb);
for (int i = 0; i < childrenCount; i++)
{
DependencyObject child = VisualTreeHelper.GetChild(lb, i);
if (child is T)
{
string childName = child.GetType().PropertyValue<string>(child, "Name");
if (String.Compare(childName, name) == 0)
return (T)child;
}
return GetItemsRecursive<T>(child, name);
}
return default(T);
}
private void listBox\u SelectionChanged(对象发送者,selectionchangedventargs e)
{
颜色重音=ColorHelper.PhoneAccentColor;
Color accentDark=ColorHelper.DARKPHONEACENTCOLOR;
foreach(e.RemovedItems中的对象项)
SetListBoxItemColor(项目,深色调);
foreach(e.AddedItems中的对象项)
SetListBoxItemColor(项目、重音);
}
私有void SetListBoxItemColor(对象项,颜色)
{
ListBoxItem ListBoxItem=listBox.ItemContainerGenerator
.ContainerFromItem(item)作为ListBoxItem;
如果(listBoxItem!=null)
{
矩形矩形=GetItemsRecursive(
listBoxItem,“listItemSideBar”);
SolidColorBrush fillBrush=新的SolidColorBrush();
fillBrush.Color=颜色;
矩形。填充=填充笔刷;
}
}
私有T GetItemsRecursive(DependencyObject lb,字符串名称)
其中T:DependencyObject
{
int childrenCount=visualtreeheloper.GetChildrenCount(lb);
for(int i=0;i