303 lines
10 KiB
C#
303 lines
10 KiB
C#
using System;
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using System.Collections;
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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.Media.Animation;
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using HandyControl.Interactivity;
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using HandyControl.Tools;
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// ReSharper disable once CheckNamespace
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namespace HandyControl.Controls
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{
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public class TabItem : System.Windows.Controls.TabItem
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{
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/// <summary>
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/// 动画速度
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/// </summary>
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private const int AnimationSpeed = 150;
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/// <summary>
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/// 选项卡是否处于拖动状态
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/// </summary>
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private static bool ItemIsDragging;
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/// <summary>
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/// 选项卡是否等待被拖动
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/// </summary>
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private bool _isWaiting;
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/// <summary>
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/// 拖动中的选项卡坐标
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/// </summary>
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private Point _dragPoint;
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/// <summary>
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/// 鼠标按下时选项卡位置
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/// </summary>
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private int _mouseDownIndex;
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/// <summary>
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/// 鼠标按下时选项卡横向偏移
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/// </summary>
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private double _mouseDownOffsetX;
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/// <summary>
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/// 鼠标按下时的坐标
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/// </summary>
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private Point _mouseDownPoint;
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/// <summary>
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/// 右侧可移动的最大值
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/// </summary>
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private double _maxMoveRight;
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/// <summary>
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/// 左侧可移动的最大值
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/// </summary>
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private double _maxMoveLeft;
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/// <summary>
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/// 选项卡宽度
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/// </summary>
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public double ItemWidth { get; internal set; }
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/// <summary>
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/// 选项卡拖动等待距离（在鼠标移动了超过20个像素无关单位后，选项卡才开始被拖动）
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/// </summary>
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private const double WaitLength = 20;
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/// <summary>
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/// 选项卡是否处于拖动状态
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/// </summary>
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private bool _isDragging;
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/// <summary>
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/// 选项卡是否已经被拖动
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/// </summary>
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private bool _isDragged;
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/// <summary>
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/// 目标横向位移
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/// </summary>
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internal double TargetOffsetX { get; set; }
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/// <summary>
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/// 当前编号
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/// </summary>
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private int _currentIndex;
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/// <summary>
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/// 标签容器
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/// </summary>
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private TabPanel _tabPanel;
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/// <summary>
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/// 当前编号
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/// </summary>
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internal int CurrentIndex
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{
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get => _currentIndex;
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set
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{
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if (_currentIndex == value || value < 0) return;
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var oldIndex = _currentIndex;
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_currentIndex = value;
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UpdateItemOffsetX(oldIndex);
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}
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}
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private bool _isLoaded;
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/// <summary>
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/// 更新选项卡横向偏移
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/// </summary>
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/// <param name="oldIndex"></param>
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private void UpdateItemOffsetX(int oldIndex)
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{
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if (!_isDragging) return;
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var moveItem = _tabPanel.ItemDic[CurrentIndex];
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moveItem.CurrentIndex -= CurrentIndex - oldIndex;
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var offsetX = moveItem.TargetOffsetX;
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var resultX = offsetX + (oldIndex - CurrentIndex) * ItemWidth;
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_tabPanel.ItemDic[CurrentIndex] = this;
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_tabPanel.ItemDic[moveItem.CurrentIndex] = moveItem;
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moveItem.CreateAnimation(offsetX, resultX);
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}
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public TabItem()
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{
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Loaded += (s, e) =>
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{
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if (_isLoaded) return;
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_tabPanel = VisualParent as TabPanel;
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_isLoaded = true;
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};
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CommandBindings.Add(new CommandBinding(ControlCommands.Close, Close));
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CommandBindings.Add(new CommandBinding(ControlCommands.CloseAll, (s, e) =>
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{
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TabControlParent.IsInternalAction = true;
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TabControlParent.Items.Clear();
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}));
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CommandBindings.Add(new CommandBinding(ControlCommands.CloseOther, (s, e) =>
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{
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TabControlParent.IsInternalAction = true;
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var enumerator = ((IEnumerable)TabControlParent.Items).GetEnumerator();
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while (enumerator.MoveNext())
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{
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var item = enumerator.Current;
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if (!Equals(item) && item != null)
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{
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TabControlParent.Items.Remove(item);
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enumerator = ((IEnumerable)TabControlParent.Items).GetEnumerator();
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}
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}
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}));
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}
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private TabControl TabControlParent => new Lazy<TabControl>(() => ItemsControl.ItemsControlFromItemContainer(this) as TabControl).Value;
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protected override void OnMouseRightButtonDown(MouseButtonEventArgs e)
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{
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base.OnMouseRightButtonDown(e);
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IsSelected = true;
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Focus();
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}
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/// <summary>
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/// 关闭
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/// </summary>
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private void Close(object sender, RoutedEventArgs e)
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{
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if (TabControlParent.IsEnableAnimation)
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{
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_tabPanel.ClearValue(TabPanel.FluidMoveDurationProperty);
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}
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else
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{
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_tabPanel.FluidMoveDuration = new Duration(TimeSpan.FromSeconds(0));
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}
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TabControlParent.IsInternalAction = true;
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TabControlParent.Items.Remove(this);
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}
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protected override void OnMouseLeftButtonDown(MouseButtonEventArgs e)
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{
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base.OnMouseLeftButtonDown(e);
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if (TabControlParent.IsDraggable && !ItemIsDragging && !_isDragging)
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{
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_tabPanel.FluidMoveDuration = new Duration(TimeSpan.FromSeconds(0));
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_mouseDownOffsetX = RenderTransform.Value.OffsetX;
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var mx = TranslatePoint(new Point(), TabControlParent).X;
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_mouseDownIndex = CalLocationIndex(mx);
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_maxMoveLeft = -_mouseDownIndex * ItemWidth;
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_maxMoveRight = TabControlParent.ActualWidth - ActualWidth + _maxMoveLeft;
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_isDragging = true;
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ItemIsDragging = true;
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_isWaiting = true;
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_dragPoint = e.GetPosition(TabControlParent);
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_mouseDownPoint = _dragPoint;
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CaptureMouse();
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}
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}
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protected override void OnMouseMove(MouseEventArgs e)
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{
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base.OnMouseMove(e);
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if (ItemIsDragging && _isDragging)
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{
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var subX = TranslatePoint(new Point(), TabControlParent).X;
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CurrentIndex = CalLocationIndex(subX);
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var p = e.GetPosition(TabControlParent);
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var subLeft = p.X - _dragPoint.X;
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var totalLeft = p.X - _mouseDownPoint.X;
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if (Math.Abs(subLeft) <= WaitLength && _isWaiting) return;
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_isWaiting = false;
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_isDragged = true;
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var left = subLeft + RenderTransform.Value.OffsetX;
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if (totalLeft < _maxMoveLeft)
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{
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left = _maxMoveLeft + _mouseDownOffsetX;
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}
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else if (totalLeft > _maxMoveRight)
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{
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left = _maxMoveRight + _mouseDownOffsetX;
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}
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var t = new TranslateTransform(left, 0);
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RenderTransform = t;
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_dragPoint = p;
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}
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}
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protected override void OnMouseLeftButtonUp(MouseButtonEventArgs e)
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{
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base.OnMouseLeftButtonUp(e);
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ReleaseMouseCapture();
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if (_isDragged)
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{
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var subX = TranslatePoint(new Point(), TabControlParent).X;
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var index = CalLocationIndex(subX);
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var left = index * ItemWidth;
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var offsetX = RenderTransform.Value.OffsetX;
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CreateAnimation(offsetX, offsetX - subX + left, index);
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}
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_isDragging = false;
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ItemIsDragging = false;
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_isDragged = false;
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}
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/// <summary>
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/// 创建动画
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/// </summary>
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internal void CreateAnimation(double offsetX, double resultX, int index = -1)
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{
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void AnimationCompleted()
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{
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RenderTransform = new TranslateTransform(resultX, 0);
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if (index == -1) return;
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var parent = TabControlParent;
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_tabPanel.CanUpdate = false;
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parent.IsInternalAction = true;
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parent.Items.Remove(this);
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parent.IsInternalAction = true;
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parent.Items.Insert(index, this);
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_tabPanel.CanUpdate = true;
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_tabPanel.ForceUpdate = true;
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_tabPanel.Measure(new Size(_tabPanel.DesiredSize.Width, ActualHeight));
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_tabPanel.ForceUpdate = false;
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Focus();
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IsSelected = true;
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}
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TargetOffsetX = resultX;
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if (!TabControlParent.IsEnableAnimation)
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{
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AnimationCompleted();
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return;
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}
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var animation = AnimationHelper.CreateAnimation(resultX, AnimationSpeed);
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animation.FillBehavior = FillBehavior.Stop;
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animation.Completed += (s1, e1) => AnimationCompleted();
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var f = new TranslateTransform(offsetX, 0);
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RenderTransform = f;
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f.BeginAnimation(TranslateTransform.XProperty, animation);
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}
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/// <summary>
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/// 计算选项卡当前合适的位置编号
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/// </summary>
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/// <param name="left"></param>
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/// <returns></returns>
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private int CalLocationIndex(double left)
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{
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var maxIndex = TabControlParent.Items.Count - 1;
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var div = (int)(left / ItemWidth);
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var rest = left % ItemWidth;
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var result = rest / ItemWidth > .5 ? div + 1 : div;
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return result > maxIndex ? maxIndex : result;
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}
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}
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} |