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https://gitee.com/akwkevin/aistudio.-wpf.-diagram
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页面视图新增缩略图模式
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艾竹
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using System;
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using System.Collections.Generic;
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using System.Collections.Specialized;
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using System.ComponentModel;
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using System.Linq;
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using System.Windows;
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using System.Windows.Controls;
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using System.Windows.Controls.Primitives;
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using System.Windows.Markup;
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using System.Windows.Threading;
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namespace AIStudio.Wpf.DiagramDesigner.Additionals.Controls
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{
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/// <summary>
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/// 轮播控件
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/// </summary>
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[DefaultProperty("Items")]
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[ContentProperty("Items")]
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[TemplatePart(Name = ElementPanelPage, Type = typeof(Panel))]
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[TemplatePart(Name = ElementItemsControl, Type = typeof(ItemsPresenter))]
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[TemplatePart(Name = Part_PreButton, Type = typeof(Button))]
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[TemplatePart(Name = Part_NextButton, Type = typeof(Button))]
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public class Carousel : ListBox, IDisposable
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{
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#region Constants
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private const string ElementPanelPage = "PART_PanelPage";
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private const string ElementItemsControl = "PART_ItemsControl";
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private const string Part_PreButton = "Part_PreButton";
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private const string Part_NextButton = "Part_NextButton";
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#endregion Constants
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#region Data
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private bool _isDisposed;
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private Panel _panelPage;
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private bool _appliedTemplate;
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private ItemsPresenter _itemsControl;
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private Button _btnPre;
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private Button _btnNext;
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private int _pageIndex = -1;
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private RadioButton _selectedButton;
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private DispatcherTimer _updateTimer;
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private readonly List<double> _widthList = new List<double>();
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#endregion Data
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public override void OnApplyTemplate()
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{
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_appliedTemplate = false;
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_panelPage?.RemoveHandler(ButtonBase.ClickEvent, new RoutedEventHandler(ButtonPages_OnClick));
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base.OnApplyTemplate();
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_itemsControl = GetTemplateChild(ElementItemsControl) as ItemsPresenter;
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_panelPage = GetTemplateChild(ElementPanelPage) as Panel;
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if (_btnPre != null)
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{
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_btnPre.Click -= ButtonPrev_OnClick;
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}
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if (_btnNext != null)
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{
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_btnNext.Click -= ButtonNext_OnClick;
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}
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_btnPre = GetTemplateChild(Part_PreButton) as Button;
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_btnNext = GetTemplateChild(Part_NextButton) as Button;
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if (_btnPre != null)
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{
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_btnPre.Click += ButtonPrev_OnClick;
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}
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if (_btnNext != null)
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{
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_btnNext.Click += ButtonNext_OnClick;
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}
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if (!CheckNull()) return;
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_panelPage.AddHandler(ButtonBase.ClickEvent, new RoutedEventHandler(ButtonPages_OnClick));
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_appliedTemplate = true;
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Update();
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}
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private void Update()
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{
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TimerSwitch(AutoRun);
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UpdatePageButtons(_pageIndex);
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}
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private bool CheckNull() => !(_itemsControl == null || _panelPage == null);
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public static readonly DependencyProperty AutoRunProperty = DependencyProperty.Register(
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"AutoRun", typeof(bool), typeof(Carousel), new PropertyMetadata(false, (o, args) => {
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var ctl = (Carousel)o;
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ctl.TimerSwitch((bool)args.NewValue);
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}));
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public static readonly DependencyProperty IntervalProperty = DependencyProperty.Register(
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"Interval", typeof(TimeSpan), typeof(Carousel), new PropertyMetadata(TimeSpan.FromSeconds(2)));
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public static readonly DependencyProperty ExtendWidthProperty = DependencyProperty.Register(
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"ExtendWidth", typeof(double), typeof(Carousel), new PropertyMetadata(0d));
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public double ExtendWidth
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{
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get => (double)GetValue(ExtendWidthProperty);
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set => SetValue(ExtendWidthProperty, value);
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}
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public static readonly DependencyProperty IsCenterProperty = DependencyProperty.Register(
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"IsCenter", typeof(bool), typeof(Carousel), new PropertyMetadata(false));
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public bool IsCenter
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{
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get => (bool)GetValue(IsCenterProperty);
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set => SetValue(IsCenterProperty, value);
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}
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public static readonly DependencyProperty PageButtonStyleProperty = DependencyProperty.Register(
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"PageButtonStyle", typeof(Style), typeof(Carousel), new PropertyMetadata(default(Style)));
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public Style PageButtonStyle
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{
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get => (Style)GetValue(PageButtonStyleProperty);
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set => SetValue(PageButtonStyleProperty, value);
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}
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public Carousel()
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{
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Loaded += (s, e) => UpdatePageButtons();
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IsVisibleChanged += Carousel_IsVisibleChanged;
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}
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~Carousel() => Dispose();
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public void Dispose()
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{
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if (_isDisposed) return;
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IsVisibleChanged -= Carousel_IsVisibleChanged;
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_updateTimer.Stop();
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_isDisposed = true;
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GC.SuppressFinalize(this);
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}
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private void Carousel_IsVisibleChanged(object sender, DependencyPropertyChangedEventArgs e)
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{
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if (_updateTimer == null) return;
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if (IsVisible)
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{
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_updateTimer.Tick += UpdateTimer_Tick;
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_updateTimer.Start();
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}
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else
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{
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_updateTimer.Stop();
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_updateTimer.Tick -= UpdateTimer_Tick;
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}
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}
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protected override void OnItemsChanged(NotifyCollectionChangedEventArgs e)
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{
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base.OnItemsChanged(e);
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UpdatePageButtons();
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}
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/// <summary>
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/// 是否自动跳转
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/// </summary>
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public bool AutoRun
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{
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get => (bool)GetValue(AutoRunProperty);
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set => SetValue(AutoRunProperty, value);
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}
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/// <summary>
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/// 跳转时间间隔
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/// </summary>
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public TimeSpan Interval
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{
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get => (TimeSpan)GetValue(IntervalProperty);
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set => SetValue(IntervalProperty, value);
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}
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/// <summary>
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/// 页码
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/// </summary>
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public int PageIndex
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{
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get => _pageIndex;
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set
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{
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if (Items.Count == 0) return;
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if (_pageIndex == value) return;
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if (value < 0)
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_pageIndex = Items.Count - 1;
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else if (value >= Items.Count)
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_pageIndex = 0;
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else
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_pageIndex = value;
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UpdatePageButtons(_pageIndex);
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}
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}
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/// <summary>
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/// 计时器开关
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/// </summary>
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private void TimerSwitch(bool run)
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{
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if (!_appliedTemplate) return;
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if (_updateTimer != null)
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{
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_updateTimer.Tick -= UpdateTimer_Tick;
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_updateTimer.Stop();
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_updateTimer = null;
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}
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if (!run) return;
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_updateTimer = new DispatcherTimer
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{
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Interval = Interval
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};
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_updateTimer.Tick += UpdateTimer_Tick;
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_updateTimer.Start();
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}
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private void UpdateTimer_Tick(object sender, EventArgs e)
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{
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if (IsMouseOver) return;
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PageIndex++;
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}
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/// <summary>
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/// 更新页按钮
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/// </summary>
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public void UpdatePageButtons(int index = -1)
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{
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if (!CheckNull()) return;
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if (!_appliedTemplate) return;
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var count = Items.Count;
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_widthList.Clear();
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_widthList.Add(0);
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var width = .0;
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foreach (FrameworkElement item in Items)
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{
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item.Measure(new Size(double.PositiveInfinity, double.PositiveInfinity));
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width += item.DesiredSize.Width;
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_widthList.Add(width);
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}
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_itemsControl.Width = _widthList.Last() + ExtendWidth;
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_panelPage.Children.Clear();
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for (var i = 0; i < count; i++)
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{
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_panelPage.Children.Add(new RadioButton
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{
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Style = PageButtonStyle
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});
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}
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if (index == -1 && count > 0) index = 0;
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if (index >= 0 && index < count)
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{
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if (_panelPage.Children[index] is RadioButton button)
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{
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button.IsChecked = true;
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button.RaiseEvent(new RoutedEventArgs(ButtonBase.ClickEvent, button));
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UpdateItemsPosition();
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}
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}
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}
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/// <summary>
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/// 更新项的位置
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/// </summary>
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private void UpdateItemsPosition()
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{
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if (!CheckNull()) return;
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if (!_appliedTemplate) return;
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if (Items.Count == 0) return;
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if (!IsCenter)
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{
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_itemsControl.BeginAnimation(MarginProperty,
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AnimationHelper.CreateAnimation(new Thickness(-_widthList[PageIndex], 0, 0, 0)));
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}
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else
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{
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var ctl = (FrameworkElement)Items[PageIndex];
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var ctlWidth = ctl.DesiredSize.Width;
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_itemsControl.BeginAnimation(MarginProperty,
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AnimationHelper.CreateAnimation(
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new Thickness(-_widthList[PageIndex] + (ActualWidth - ctlWidth) / 2, 0, 0, 0)));
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}
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}
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protected override void OnRenderSizeChanged(SizeChangedInfo sizeInfo)
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{
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base.OnRenderSizeChanged(sizeInfo);
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UpdateItemsPosition();
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}
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private void ButtonPages_OnClick(object sender, RoutedEventArgs e)
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{
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if (!CheckNull()) return;
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_selectedButton = e.OriginalSource as RadioButton;
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var index = _panelPage.Children.IndexOf(_selectedButton);
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if (index != -1)
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{
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PageIndex = index;
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}
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}
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private void ButtonPrev_OnClick(object sender, RoutedEventArgs e) => PageIndex--;
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private void ButtonNext_OnClick(object sender, RoutedEventArgs e) => PageIndex++;
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}
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}
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