我在使用Telerik Combobox时遇到了问题,基本的WPF Combobox也会出现相同的情况。
我的场景如下:当用户尝试打开Combobox时,整个页面(包括此控件)应该向上移动,因为底部区域将被键盘占用。
为了实现这一点,我捕获了GotFocus事件,并通过编程方式更新了Scrollviewer的位置。
以下是XAML:
<ScrollViewer Grid.Row="2" x:Name="KeyBoardScrollViewer" PanningMode="VerticalOnly" VerticalScrollBarVisibility="Hidden">
<telerik:RadComboBox Grid.Row="5" GotFocus="UIElement_OnGotFocus" LostFocus="UIElement_OnLostFocus"
IsEditable="True"
Grid.Column="1"
ItemsSource="{Binding StreetOthers, Mode=TwoWay}"
Text="{Binding SelectedStreetOthers, Mode=TwoWay, ValidatesOnDataErrors=True, UpdateSourceTrigger=PropertyChanged}"
Height="36" Width="250"
HorizontalAlignment="Left"
VerticalAlignment="Top"
FontSize="18"
Margin="10 0 0 0"
Padding="5" />
</ScrollViewer>
并且代码背后是:
public double RememberedPoisitionOfScrollBar { get; set; }
private void UIElement_OnGotFocus(object sender, RoutedEventArgs e)
{
Application.Current.Dispatcher.InvokeAsync(() =>
{
if (!Keyboard.IsOpen)
{
Keyboard.IsOpen = true;
KeyBoardScrollViewer.VerticalScrollBarVisibility = ScrollBarVisibility.Visible;
}
Point relativePoint = ((FrameworkElement)sender).TransformToAncestor(KeyBoardScrollViewer)
.Transform(new Point(0, 0));
KeyBoardScrollViewer.CanContentScroll = false;
RememberedPoisitionOfScrollBar = relativePoint.Y - 5;
var offset = KeyBoardScrollViewer.VerticalOffset + relativePoint.Y - 5; //sender.OccludedRect.Top
KeyBoardScrollViewer.ScrollToVerticalOffset(offset);
//KeyBoardScrollViewer.ScrollToVerticalOffset(offset);
KeyBoardScrollViewer.UpdateLayout();
});
Keyboard.Width = this.ActualWidth;
}
private void UIElement_OnLostFocus(object sender, RoutedEventArgs e)
{
Keyboard.IsOpen = false;
KeyBoardScrollViewer.ScrollToVerticalOffset(KeyBoardScrollViewer.VerticalOffset - RememberedPoisitionOfScrollBar);
KeyBoardScrollViewer.UpdateLayout();
KeyBoardScrollViewer.VerticalScrollBarVisibility = ScrollBarVisibility.Hidden;
}
这个解决方案有效,下拉框被移动到视图的顶部,但是我遇到了奇怪的问题。下拉框“内容”仍然停留在原来的位置,并且不会根据下拉框的新位置进行更新。这是图片: 根据Telerik管理员(旧帖子)的说法,这是一个WPF问题,但必须有一种解决方法,对吗?任何想法都很有用!
谢谢!