本文实例为大家分享了WPF实现轮播图切换效果的具体代码，供大家参考，具体内容如下
实现效果如下：
步骤：
1、自定义控件MyImageControl
实现图片的裁切和动画的赋值。
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public partial class MyImageControl : UserControl { public static readonly DependencyProperty ShowImageProperty = DependencyProperty.Register("ShowImage", typeof(BitmapImage), typeof(MyImageControl), new PropertyMetadata(null)); public BitmapImage ShowImage { get { return (BitmapImage)GetValue(ShowImageProperty); } set { SetValue(ShowImageProperty, value); } } public MyImageControl() { InitializeComponent(); } public Storyboard storyboard = new Storyboard(); private const int FlipCount = 5; BitmapSource[] bitmap = new BitmapSource[FlipCount]; Image[] images = new Image[FlipCount]; public void GetHorizontalFlip() { int partImgWidth = (int)this.ShowImage.PixelWidth; int partImgHeight = (int)(this.ShowImage.PixelHeight / FlipCount); for (int i = 0; i < FlipCount; i++) { bitmap[i] = GetPartImage(this.ShowImage, 0, i * partImgHeight, partImgWidth, partImgHeight); images[i] = new Image() { Width = partImgWidth, Height = partImgHeight, Source = bitmap[i], }; Canvas.SetTop(images[i], i * partImgHeight); this.mainCanvas.Children.Add(images[i]); DoubleAnimation da = new DoubleAnimation(0, (int)this.ShowImage.PixelWidth, new Duration(TimeSpan.FromMilliseconds((i + 1) * 250)), FillBehavior.HoldEnd); storyboard.Children.Add(da); Storyboard.SetTarget(da, images[i]); Storyboard.SetTargetProperty(da, new PropertyPath("(Canvas.Left)")); } storyboard.FillBehavior = FillBehavior.HoldEnd; storyboard.Completed += new EventHandler(Storyboard_Completed); } private void Storyboard_Completed(object sender, EventArgs e) { this.mainCanvas.Children.Clear(); storyboard.Children.Clear(); } private BitmapSource GetPartImage(BitmapImage img, int XCoordinate, int YCoordinate, int Width, int Height) { return new CroppedBitmap(img, new Int32Rect(XCoordinate, YCoordinate, Width, Height)); } } |
2、自定义轮播控件
实现图片点击轮播和动画的启动。
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public partial class MyRollControl : UserControl { public MyRollControl() { InitializeComponent(); } /// <summary> /// 是否开始滚动 /// </summary> public bool isBegin = false; /// <summary> /// 本轮剩余滚动数 /// </summary> public int rollNum = 0; private List<BitmapImage> _ls_images; /// <summary> /// 滚动图片组 /// </summary> public List<BitmapImage> ls_images { set { if (rollNum > 0) { // 本轮滚动未结束 } else { // 开始新的一轮滚动 _ls_images = value; rollNum = _ls_images.Count(); } } get { return _ls_images; } } private int n_index = 0;// 滚动索引 /// <summary> /// 启动 /// </summary> public void Begin() { if (!isBegin) { isBegin = true; this.ResetStory(); this.controlFront.GetHorizontalFlip(); } } /// <summary> /// 初始化图片 /// </summary> void ResetStory() { if (this.ls_images.Count > 0) { this.controlFront.ShowImage = this.ls_images[this.n_index++ % this.ls_images.Count]; this.controlBack.ShowImage = this.ls_images[this.n_index % this.ls_images.Count]; } } private void mainGrid_MouseDown(object sender, MouseButtonEventArgs e) { if (this.controlFront.storyboard.Children.Count > 0) { if(this.controlBack.storyboard.Children.Count <= 0) { Canvas.SetZIndex(this.controlFront, 0); this.controlFront.storyboard.Begin(); this.controlBack.GetHorizontalFlip(); rollNum--; this.ResetStory(); } } else if(this.controlFront.storyboard.Children.Count <= 0) { if(this.controlBack.storyboard.Children.Count > 0) { this.controlBack.storyboard.Begin(); rollNum--; this.ResetStory(); Canvas.SetZIndex(this.controlFront, -1); this.controlFront.GetHorizontalFlip(); } } } } |
3、主窗体调用后台逻辑
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public partial class MainWindow : Window { public MainWindow() { InitializeComponent(); List<BitmapImage> ls_adv_img = new List<BitmapImage>(); List<string> listAdv = GetUserImages(@"C:\Image"); foreach (string a in listAdv) { BitmapImage img = new BitmapImage(new Uri(a)); ls_adv_img.Add(img); } this.rollImg.ls_images = ls_adv_img; this.rollImg.Begin(); } /// <summary> /// 获取当前用户的图片文件夹中的图片路径列表(不包含子文件夹) /// </summary> private List<string> GetUserImages(string path) { List<string> images = new List<string>(); DirectoryInfo dir = new DirectoryInfo(path); FileInfo[] files = GetPicFiles(path, "*.jpg,*.png,*.bmp,", SearchOption.TopDirectoryOnly); if (files != null) { foreach (FileInfo file in files) { images.Add(file.FullName); } } return images; } private FileInfo[] GetPicFiles(string picPath, string searchPattern, SearchOption searchOption) { List<FileInfo> ltList = new List<FileInfo>(); DirectoryInfo dir = new DirectoryInfo(picPath); string[] sPattern = searchPattern.Replace(';', ',').Split(','); for (int i = 0; i < sPattern.Length; i++) { FileInfo[] files = null; try { files = dir.GetFiles(sPattern[i], searchOption); } catch (System.Exception ex) { files = new FileInfo[] { }; } ltList.AddRange(files); } return ltList.ToArray(); }} |
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。
原文链接：https://blog.csdn.net/dnazhd/article/details/107413269
