drag-and-drop 相关问题

我正在尝试创建一个带有两个面板的窗口，可以在两个面板之间移动文本框。我的代码：主窗口.xaml 我正在尝试创建一个带有两个面板的窗口，文本框可以在两个面板之间移动。我的代码： MainWindow.xaml <Window x:Class="DragAndDropTest.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" xmlns:local="clr-namespace:DragAndDropTest" mc:Ignorable="d" Title="MainWindow" Height="450" Width="800"> <Grid> <Grid.ColumnDefinitions> <ColumnDefinition Width="*" /> <ColumnDefinition Width="*" /> </Grid.ColumnDefinitions> <StackPanel Grid.Column="0" Width="Auto" HorizontalAlignment="Stretch" AllowDrop="True" Drop="StackPanel_Drop"> <TextBox IsReadOnly="True" Text="Test1" MouseMove="TextBox_MouseMove" PreviewMouseLeftButtonDown="TextBox_PreviewMouseLeftButtonDown" /> <TextBox IsReadOnly="True" Text="Test2" MouseMove="TextBox_MouseMove" PreviewMouseLeftButtonDown="TextBox_PreviewMouseLeftButtonDown"/> <TextBox IsReadOnly="True" Text="Test3" MouseMove="TextBox_MouseMove" PreviewMouseLeftButtonDown="TextBox_PreviewMouseLeftButtonDown"/> </StackPanel> <StackPanel Grid.Column="1" Width="Auto" HorizontalAlignment="Stretch" AllowDrop="True" Drop="StackPanel_Drop"> <TextBox IsReadOnly="True" Text="Test4" MouseMove="TextBox_MouseMove" PreviewMouseLeftButtonDown="TextBox_PreviewMouseLeftButtonDown"/> <TextBox IsReadOnly="True" Text="Test5" MouseMove="TextBox_MouseMove" PreviewMouseLeftButtonDown="TextBox_PreviewMouseLeftButtonDown"/> <TextBox IsReadOnly="True" Text="Test6" MouseMove="TextBox_MouseMove" PreviewMouseLeftButtonDown="TextBox_PreviewMouseLeftButtonDown" /> </StackPanel> </Grid> </Window> MainWindow.xaml.cs using System.Windows; using System.Windows.Controls; using System.Windows.Input; namespace DragAndDropTest { /// <summary> /// Interaction logic for MainWindow.xaml /// </summary> public partial class MainWindow : Window { private TextBox draggedTextBox; public MainWindow() { InitializeComponent(); } private void TextBox_PreviewMouseLeftButtonDown(object sender, MouseButtonEventArgs e) { draggedTextBox = sender as TextBox; } private void TextBox_MouseMove(object sender, MouseEventArgs e) { if (e.LeftButton == MouseButtonState.Pressed && draggedTextBox != null) { draggedTextBox.Dispatcher.Invoke(() => { DragDrop.DoDragDrop(draggedTextBox, draggedTextBox.Text, DragDropEffects.Move); }); } } private void StackPanel_Drop(object sender, DragEventArgs e) { if (e.Data.GetDataPresent(DataFormats.Text)) { string text = (string)e.Data.GetData(DataFormats.Text); if (sender != draggedTextBox.Parent) { var stackPanel = sender as StackPanel; if (stackPanel != null) { var textBox = new TextBox { Text = text }; stackPanel.Children.Add(textBox); } var originalStackPanel = draggedTextBox.Parent as StackPanel; if (originalStackPanel != null) { originalStackPanel.Children.Remove(draggedTextBox); } } } } } } 当我尝试将元素拖动到第二个面板时，出现异常： System.InvalidOperationException。 Dispatcher processing has been suspended, but messages are still being processed 中 TextBox_MouseMove 方法线路： DragDrop.DoDragDrop(draggedTextBox, draggedTextBox.Text, DragDropEffects.Move); 我在互联网上找不到解决方案。你能告诉我我做错了什么吗？问候嗨，我认为问题出在 Dispatcher.Invoke 调用中，您可以尝试直接调用方法 DragDrop.DoDragDrop 而无需从 UI 线程调用，其创建问题可能会导致 InvalidOperationException。谢谢

c# .net wpf drag-and-drop

回答 1 投票 0

ondrop 触发时 event.dataTransfer.files 为空？

好吧，我设置了一个元素来接收文件删除事件，但是当我查看 event.dataTransfer 时，它是空白的。我还没有抽出时间学习拖放式 HTML5 API，而且我仍然是

javascript html drag-and-drop

回答 4 投票 0

放置元素后无法再次拖动

我有这个代码：导入 SwiftUI 结构ContentView：视图{ @State private var offset = CGSize.zero var body: 一些视图 { ZStack { 红色 HStack { 团体 {

swiftui drag-and-drop

回答 1 投票 0

从孩子那里获取父母的ID

我正在向子组件添加拖放功能，我想在dragstart事件中获取父组件的id，以便拖动操作知道组件的来源。有没有...