UWP RichEditBox 相当于 GetCharIndexFromPosition

Question

UWP 的 richeditbox 中似乎缺少 GetCharIndexFromPosition。当某个范围悬停在 RichEditBox 中时，我想显示一个工具提示。 UWP 可以做到这一点吗？

Answer 1

在UWP中，我们可以使用GetRangeFromPoint(Point, PointOptions) method as the equivalent of GetCharIndexFromPosition. This method retrieves the degenerate (empty) text range at, or nearest to, a particular point on the screen. It returns a ITextRange object and the StartPosition 属性 of ITextRange类似于GetCharIndexFromPosition方法返回的字符索引。

下面是一个简单的例子：

XAML:

<Grid Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
    <RichEditBox x:Name="editor" />
</Grid>

代码隐藏：

public MainPage()
{
    this.InitializeComponent();
    editor.Document.SetText(Windows.UI.Text.TextSetOptions.None, @"This is a text for testing.");
    editor.AddHandler(PointerMovedEvent, new PointerEventHandler(editor_PointerMoved), true);
}

private void editor_PointerMoved(object sender, PointerRoutedEventArgs e)
{
    var position = e.GetCurrentPoint(editor).Position;

    var range = editor.Document.GetRangeFromPoint(position, Windows.UI.Text.PointOptions.ClientCoordinates);

    System.Diagnostics.Debug.WriteLine(range.StartPosition);
}

UWP RichEditBox 相当于 GetCharIndexFromPosition

UWP RichEditBox equivalent of GetCharIndexFromPosition

c#

xaml

richeditbox

uwp

uwp-xaml