Question

我试图通过用鼠标按下鼠标悬停在GridView中来选择多个项目（如绘图）。我尝试使用PointerEntered事件实现此目的，但我无法从代码中更改选择。有没有办法实现自定义选择模式？

这对我不起作用，因为我无法在Win RT XAML中使用Style.Triggers： https://stackoverflow.com/a/2886223/5739170

Answer 1

您必须继承gridview控件并覆盖PrepareContainerForItemOverride方法：

代码：

public class MyGridView : GridView
{

    protected override void PrepareContainerForItemOverride(DependencyObject element, object item)
    {
        (element as GridViewItem).PointerMoved += MyGridView_PointerMoved;

        base.PrepareContainerForItemOverride(element, item);
    }

    private void MyGridView_PointerMoved(object sender, PointerRoutedEventArgs e)
    {

 //your logic for setting the isselected
         (sender as GridViewItem).IsSelected = true;
    }
}

Answer 2

这是我最终根据Chirag Shah的回答实现的：

class MyGridView : GridView
{
    protected override void PrepareContainerForItemOverride(DependencyObject element, object item)
    {
        (element as GridViewItem).PointerEntered += SelectItemOnEntered;
        (element as GridViewItem).AddHandler(PointerPressedEvent, new PointerEventHandler(SelectItemOnPressed), true);
        base.PrepareContainerForItemOverride(element, item);
    }

    private void SelectItemOnPressed(object sender, PointerRoutedEventArgs e)
    {
        (sender as GridViewItem).IsSelected = !(sender as GridViewItem).IsSelected;
    }

    private void SelectItemOnEntered(object sender, PointerRoutedEventArgs e)
    {
        if (e.Pointer.IsInContact)
            (sender as GridViewItem).IsSelected = !(sender as GridViewItem).IsSelected;
    }
}

我希望这可以帮助每个想要实现这种选择模式的人。

Win RT Xaml GridView：拖动选择多个项目

2 个答案: