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[英]How to Continue The Text from one textblock to another textblock if the first textblock text length is limited?
[英]How to move text from one Textblock to another Textblock using Drag and Drop in a Universal Windows Application?
我知道如何設置CanDrag和AllowDrop之類的屬性,以及定義DragOver方法和Drop方法。 我只是不知道在Drop方法中寫什么。
如何使用拖放功能將文本從一個Textblock移至另一個Textblock
我們可以定義DragStarting
為源事件Textblock
,並保存源的文字Textblock
中DragStartingEventArgs
拖動過程中轉移。 並在放置到目標Textblock
時接受文本。 從DragEventHandler
讀取文本並將其設置為目標Textblock
。
我在這里寫了一個簡單的示例,將文本從txtsource
追加到txttarget
。
XAML代碼:
<StackPanel Background="{ThemeResource ApplicationPageBackgroundThemeBrush}" Padding="30">
<Border BorderBrush="Azure" BorderThickness="2">
<TextBlock x:Name="txtsource" Text="I'm the first textblock" CanDrag="True" DragStarting="txtsource_DragStarting" />
</Border>
<Border BorderBrush="Azure" BorderThickness="2" Margin="20" AllowDrop="True" >
<TextBlock x:Name="txttarget" Text="I'm the second textblock" Drop="txttarget_Drop" Height="50" Width="400" AllowDrop="True" DragEnter="txttarget_DragEnter"/>
</Border>
</StackPanel>
后面的代碼
private void txtsource_DragStarting(UIElement sender, DragStartingEventArgs args)
{
args.Data.SetText(txtsource.Text);
}
private async void txttarget_Drop(object sender, DragEventArgs e)
{
bool hasText = e.DataView.Contains(StandardDataFormats.Text);
e.AcceptedOperation = hasText ? DataPackageOperation.Copy : DataPackageOperation.None;
if (hasText)
{
var text = await e.DataView.GetTextAsync();
txttarget.Text +="\n"+ text;
}
}
private void txttarget_DragEnter(object sender, DragEventArgs e)
{
bool hasText = e.DataView.Contains(StandardDataFormats.Text);
e.AcceptedOperation = hasText ? DataPackageOperation.Copy : DataPackageOperation.None;
if (hasText)
{
e.DragUIOverride.Caption = "Drop here to insert text";
}
}
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