WPF實現手風琴式輪播圖切換效果
阿新 • • 發佈:2020-09-02
本文例項為大家分享了WPF實現輪播圖切換效果的具體程式碼,供大家參考,具體內容如下
實現效果如下:
步驟:
1、自定義控制元件MyImageControl
實現圖片的裁切和動畫的賦值。
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,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、自定義輪播控制元件
實現圖片點選輪播和動畫的啟動。
public partial class MyRollControl : UserControl { public MyRollControl() { InitializeComponent(); } /// <summary> /// 是否開始滾動 /// </summary> public bool isBegin = false; /// <summary> /// 本輪剩餘滾動數 /// </summary> public int rollNum = 0; private List<BitmapImage> _ls_images; /// <summary> /// 滾動圖片組 /// </summary> public List<BitmapImage> ls_images { set { if (rollNum > 0) { // 本輪滾動未結束 } else { // 開始新的一輪滾動 _ls_images = value; rollNum = _ls_images.Count(); } } get { return _ls_images; } } private int n_index = 0;// 滾動索引 /// <summary> /// 啟動 /// </summary> public void Begin() { if (!isBegin) { isBegin = true; this.ResetStory(); this.controlFront.GetHorizontalFlip(); } } /// <summary> /// 初始化圖片 /// </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、主窗體呼叫後臺邏輯
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> /// 獲取當前使用者的圖片資料夾中的圖片路徑列表(不包含子資料夾) /// </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內容,希望對大家的學習有所幫助,也希望大家多多支援我們。