添加项目文件。
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359
DragDropHelper.cs
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359
DragDropHelper.cs
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using System;
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using System.Collections.Generic;
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using System.Diagnostics;
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using System.Windows;
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using System.Windows.Controls;
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using System.Windows.Input;
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using System.Windows.Media;
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using System.Windows.Shapes;
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using WinForms = System.Windows.Forms;
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namespace DrillTools
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{
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/// <summary>
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/// 拖放帮助类
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/// </summary>
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public static class DragDropHelper
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{
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private static System.Windows.Point _startPoint;
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private static bool _isDragging;
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private static DragToolTipWindow? _dragToolTipWindow;
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private static Window? _ownerWindow;
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private static System.Windows.Shapes.Rectangle? _insertionIndicator;
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private static int _insertionIndex = -1;
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private static DateTime? _lastUpdateTime;
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/// <summary>
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/// 启用 ListView 的拖放功能
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/// </summary>
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/// <typeparam name="T">数据项类型</typeparam>
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/// <param name="listView">ListView 控件</param>
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/// <param name="insertionIndicator">插入位置指示器</param>
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public static void EnableDragDrop<T>(System.Windows.Controls.ListView listView, System.Windows.Shapes.Rectangle insertionIndicator) where T : class
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{
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_insertionIndicator = insertionIndicator;
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_ownerWindow = Window.GetWindow(listView);
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listView.PreviewMouseLeftButtonDown += (sender, e) =>
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{
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_startPoint = e.GetPosition(null);
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_isDragging = false;
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};
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listView.PreviewMouseMove += (sender, e) =>
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{
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if (e.LeftButton == MouseButtonState.Pressed && !_isDragging)
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{
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System.Windows.Point position = e.GetPosition(null);
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if (Math.Abs(position.X - _startPoint.X) > SystemParameters.MinimumHorizontalDragDistance ||
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Math.Abs(position.Y - _startPoint.Y) > SystemParameters.MinimumVerticalDragDistance)
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{
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_isDragging = true;
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var listViewItem = FindAncestor<System.Windows.Controls.ListViewItem>((DependencyObject)e.OriginalSource);
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if (listViewItem != null)
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{
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var item = listView.ItemContainerGenerator.ItemFromContainer(listViewItem) as T;
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if (item != null)
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{
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// 获取屏幕坐标
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var screenPosition = listView.PointToScreen(e.GetPosition(listView));
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// 创建并显示拖动提示
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CreateDragToolTip(item, screenPosition);
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// 使用 QueryContinueDrag 事件来更新位置
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System.Windows.QueryContinueDragEventHandler queryContinueHandler = null;
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queryContinueHandler = (sender, e) =>
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{
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if (_dragToolTipWindow != null)
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{
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// 获取当前鼠标位置
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var currentPos = WinForms.Control.MousePosition;
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_dragToolTipWindow.UpdatePosition(new System.Windows.Point(currentPos.X, currentPos.Y));
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}
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// 如果拖放结束，移除事件处理
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if (e.Action == System.Windows.DragAction.Drop || e.Action == System.Windows.DragAction.Cancel)
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{
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DragDrop.RemoveQueryContinueDragHandler(listView, queryContinueHandler);
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}
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};
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DragDrop.AddQueryContinueDragHandler(listView, queryContinueHandler);
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System.Windows.DataObject data = new System.Windows.DataObject(typeof(T), item);
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DragDrop.DoDragDrop(listViewItem, data, System.Windows.DragDropEffects.Move);
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// 清理拖动提示
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CleanupDragToolTip();
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}
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}
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}
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}
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};
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listView.DragOver += (sender, e) =>
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{
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if (e.Data.GetDataPresent(typeof(T)))
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{
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e.Effects = System.Windows.DragDropEffects.Move;
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// 更新插入位置指示器
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UpdateInsertionIndicator(listView, e.GetPosition(listView));
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}
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else
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{
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e.Effects = System.Windows.DragDropEffects.None;
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}
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e.Handled = true;
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};
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listView.DragLeave += (sender, e) =>
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{
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HideInsertionIndicator();
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};
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listView.Drop += (sender, e) =>
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{
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try
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{
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// 隐藏插入指示器
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HideInsertionIndicator();
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Debug.WriteLine($"[DragDrop] Drop事件触发 - OriginalSource类型: {e.OriginalSource?.GetType().Name}");
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Debug.WriteLine($"[DragDrop] Drop位置: ({e.GetPosition(listView).X}, {e.GetPosition(listView).Y})");
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if (e.Data.GetDataPresent(typeof(T)))
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{
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var droppedItem = e.Data.GetData(typeof(T)) as T;
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if (droppedItem != null)
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{
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Debug.WriteLine($"[DragDrop] 拖放项: {droppedItem}");
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// 检查是否是机台码刀具，如果是则不允许移动
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if (droppedItem is ToolItem toolItem && toolItem.ToolType == ToolType.MachineCode)
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{
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Debug.WriteLine("[DragDrop] 机台码刀具不允许移动");
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System.Windows.MessageBox.Show("机台码刀具不允许移动位置", "提示", MessageBoxButton.OK, MessageBoxImage.Information);
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_isDragging = false;
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return;
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}
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var targetItem = FindAncestor<System.Windows.Controls.ListViewItem>((DependencyObject)e.OriginalSource);
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string ss = targetItem == null ? "NULL" : "找到";
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Debug.WriteLine($"[DragDrop] 目标ListViewItem: {ss}");
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if (targetItem == null)
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{
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Debug.WriteLine("[DragDrop] 警告: 目标项为空，可能是拖放到列表外部");
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_isDragging = false;
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return;
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}
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var targetIndex = listView.ItemContainerGenerator.IndexFromContainer(targetItem);
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Debug.WriteLine($"[DragDrop] 目标索引: {targetIndex}");
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var sourceIndex = listView.Items.IndexOf(droppedItem);
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Debug.WriteLine($"[DragDrop] 源索引: {sourceIndex}");
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// 检查目标位置是否是机台码刀具
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var viewModel = listView.DataContext as MainWindowViewModel;
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if (viewModel != null && viewModel.Tools.Count > targetIndex)
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{
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var targetTool = viewModel.Tools[targetIndex];
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if (targetTool.ToolType == ToolType.MachineCode)
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{
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Debug.WriteLine("[DragDrop] 不能移动到机台码刀具位置");
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System.Windows.MessageBox.Show("不能移动到机台码刀具位置", "提示", MessageBoxButton.OK, MessageBoxImage.Information);
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_isDragging = false;
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return;
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}
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}
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if (sourceIndex != -1 && targetIndex != -1 && sourceIndex != targetIndex)
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{
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viewModel?.ReorderTools(sourceIndex, targetIndex);
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Debug.WriteLine($"[DragDrop] 重新排序完成: {sourceIndex} -> {targetIndex}");
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}
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else
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{
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Debug.WriteLine($"[DragDrop] 跳过重新排序 - 源索引: {sourceIndex}, 目标索引: {targetIndex}");
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}
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}
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}
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}
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catch (Exception ex)
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{
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Debug.WriteLine($"[DragDrop] 异常: {ex.GetType().Name} - {ex.Message}");
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Debug.WriteLine($"[DragDrop] 堆栈跟踪: {ex.StackTrace}");
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System.Windows.MessageBox.Show($"拖放操作发生错误: {ex.Message}", "错误", MessageBoxButton.OK, MessageBoxImage.Error);
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}
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finally
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{
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_isDragging = false;
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}
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};
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}
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/// <summary>
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/// 查找指定类型的父元素
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/// </summary>
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/// <typeparam name="T">父元素类型</typeparam>
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/// <param name="current">当前元素</param>
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/// <returns>找到的父元素，如果未找到则返回 null</returns>
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private static T? FindAncestor<T>(DependencyObject current) where T : DependencyObject
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{
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Debug.WriteLine($"[FindAncestor] 开始查找类型 {typeof(T).Name}，起始元素类型: {current?.GetType().Name ?? "NULL"}");
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int depth = 0;
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while (current != null)
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{
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Debug.WriteLine($"[FindAncestor] 深度 {depth}: 当前类型 {current.GetType().Name}");
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if (current is T ancestor)
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{
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Debug.WriteLine($"[FindAncestor] 找到匹配的祖先类型 {typeof(T).Name}");
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return ancestor;
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}
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current = VisualTreeHelper.GetParent(current);
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depth++;
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if (depth > 10) // 防止无限循环
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{
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Debug.WriteLine("[FindAncestor] 警告: 搜索深度超过10层，停止搜索");
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break;
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}
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}
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Debug.WriteLine($"[FindAncestor] 未找到类型 {typeof(T).Name} 的祖先");
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return null;
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}
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/// <summary>
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/// 处理主窗口鼠标移动事件，更新拖动提示位置
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/// </summary>
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private static void OnOwnerWindowMouseMove(object sender, System.Windows.Input.MouseEventArgs e)
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{
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if (_dragToolTipWindow != null && _isDragging)
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{
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// 获取屏幕坐标
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var windowPosition = e.GetPosition(_ownerWindow);
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var screenPosition = _ownerWindow.PointToScreen(windowPosition);
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_dragToolTipWindow.UpdatePosition(screenPosition);
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}
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}
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/// <summary>
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/// 创建拖动提示窗口
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/// </summary>
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private static void CreateDragToolTip<T>(T item, System.Windows.Point position) where T : class
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{
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if (item is ToolItem toolItem && _ownerWindow != null)
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{
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_dragToolTipWindow = new DragToolTipWindow();
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_dragToolTipWindow.SetToolInfo(toolItem);
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_dragToolTipWindow.UpdatePosition(position);
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// 不设置 Owner，这样窗口可以独立定位
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_dragToolTipWindow.Show();
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}
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}
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/// <summary>
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/// 清理拖动提示窗口
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/// </summary>
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private static void CleanupDragToolTip()
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{
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if (_dragToolTipWindow != null)
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{
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_dragToolTipWindow.Close();
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_dragToolTipWindow = null;
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}
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if (_ownerWindow != null)
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{
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_ownerWindow.MouseMove -= OnOwnerWindowMouseMove;
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}
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}
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/// <summary>
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/// 更新插入位置指示器
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/// </summary>
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private static void UpdateInsertionIndicator(System.Windows.Controls.ListView listView, System.Windows.Point position)
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{
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if (_insertionIndicator == null) return;
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// 使用节流机制，避免过于频繁的更新
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if (_lastUpdateTime != null && DateTime.Now - _lastUpdateTime < TimeSpan.FromMilliseconds(16))
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return;
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_lastUpdateTime = DateTime.Now;
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try
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{
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// 使用 VisualTreeHelper 找到鼠标下的元素
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var element = listView.InputHitTest(position) as DependencyObject;
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var listViewItem = FindAncestor<System.Windows.Controls.ListViewItem>(element);
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if (listViewItem != null)
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{
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var index = listView.ItemContainerGenerator.IndexFromContainer(listViewItem);
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var itemBounds = listViewItem.TransformToAncestor(listView)
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.TransformBounds(new Rect(0, 0, listViewItem.ActualWidth, listViewItem.ActualHeight));
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// 判断是在上半部分还是下半部分
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bool insertAfter = position.Y > itemBounds.Top + itemBounds.Height / 2;
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int targetIndex = insertAfter ? index + 1 : index;
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if (targetIndex != _insertionIndex)
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{
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_insertionIndex = targetIndex;
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// 更新指示器位置
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_insertionIndicator.Visibility = Visibility.Visible;
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// 计算指示器位置
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double indicatorTop = insertAfter ? itemBounds.Bottom : itemBounds.Top;
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// 使用 VerticalAlignment 和 Margin 结合来定位指示器
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_insertionIndicator.VerticalAlignment = VerticalAlignment.Top;
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_insertionIndicator.Margin = new Thickness(0, indicatorTop, 0, 0);
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}
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}
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else
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{
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// 如果没有找到目标项，检查是否在列表末尾
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if (position.Y > listView.ActualHeight - 20)
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{
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_insertionIndex = listView.Items.Count;
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// 在列表末尾显示指示器
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_insertionIndicator.Visibility = Visibility.Visible;
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_insertionIndicator.VerticalAlignment = VerticalAlignment.Top;
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_insertionIndicator.Margin = new Thickness(0, listView.ActualHeight - 2, 0, 0);
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}
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else
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{
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HideInsertionIndicator();
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}
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}
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}
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catch (Exception ex)
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{
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Debug.WriteLine($"[DragDrop] 更新插入指示器时发生错误: {ex.Message}");
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HideInsertionIndicator();
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}
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}
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/// <summary>
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/// 隐藏插入位置指示器
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/// </summary>
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private static void HideInsertionIndicator()
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{
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if (_insertionIndicator != null)
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{
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_insertionIndicator.Visibility = Visibility.Collapsed;
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}
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_insertionIndex = -1;
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}
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}
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}
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Reference in New Issue
Block a user