制作一个简单的WPF图片浏览器
这里将实现以下几个功能:
1. 对指定文件夹下所有JPG文件进行预览
2. 对选定片进行旋转
3. 对选定片进行灰度处理
4. 对选定片进行裁切处理
5. 无限制的恢复功能
6. 类似加入购物车的功能
以下来看看其实现过程。
1. 建立一个ImageFile类,用来读取像文件:
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// ImageFile.cs
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using System;
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using System.Collections.Generic;
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using System.Windows.Media.Imaging;
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using System.Text;
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namespace PhotoDemo
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{
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public class ImageFile
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{
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private String _path;
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public String Path { get { return _path; } }
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private Uri _uri;
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public Uri Uri { get { return _uri; } }
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private BitmapFrame _image;
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public BitmapFrame Image { get { return _image; } }
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public ImageFile(string path)
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{
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_path = path;
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_uri = new Uri(_path);
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_image = BitmapFrame.Create(_uri);
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}
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public override string ToString()
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{
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return Path;
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}
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}
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}
2. 建立一个像列表的类,用于取得指定目录下的所有jpg像文件:
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// PhotoList.cs
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using System;
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using System.Collections.Generic;
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using System.Collections.ObjectModel;
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using System.IO;
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using System.Text;
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namespace PhotoDemo
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{
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public class PhotoList : ObservableCollection<ImageFile>
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{
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DirectoryInfo _directory;
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public DirectoryInfo Directory
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{
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set
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{
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_directory = value;
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Update();
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}
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get { return _directory; }
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}
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public string Path
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{
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set
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{
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_directory = new DirectoryInfo(value);
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Update();
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}
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get { return _directory.FullName; }
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}
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public PhotoList() { }
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public PhotoList(DirectoryInfo directory)
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{
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_directory = directory;
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Update();
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}
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public PhotoList(string path) : this(new DirectoryInfo(path)) { }
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private void Update()
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{
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foreach (FileInfo f in _directory.GetFiles("*.jpg"))
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{
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Add(new ImageFile(f.FullName));
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}
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}
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}
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}
这里有两个公共属性:Directory和Path,用来获取或设置像目录信息和路径,还有一个Update()私有方法,当文件路径变化时,更新最新的像文件列表数据。
3. 建立后期处理的类。
由于后期加工均涉及“印”,所以就建立一个名为“印类型”(PrintType)的类:
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// PrintType.cs
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using System;
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using System.Collections.Generic;
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using System.Text;
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namespace PhotoDemo
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{
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public class PrintType
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{
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private string _description;
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public string Description { get { return _description; } }
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private double _cost;
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public double Cost { get { return _cost; } }
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public PrintType(string description, double cost)
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{
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_description = description;
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_cost = cost;
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}
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public override string ToString()
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{
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return _description;
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}
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}
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}
这里有两个只读属性:描述Description和费用Cost,还对ToString()方法进行了重载。
4. PrintTypeList类,是PrintType列表的集合。
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// PrintTypeList .cs
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using System;
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using System.Collections.Generic;
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using System.Collections.ObjectModel;
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using System.Text;
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namespace PhotoDemo
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{
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public class PrintTypeList : ObservableCollection<PrintType>
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{
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public PrintTypeList()
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{
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Add(new PrintType("4x6 Print", 0.15));
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Add(new PrintType("Greeting Card", 1.49));
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Add(new PrintType("T-Shirt", 14.99));
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}
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}
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}
5. 建立一个PrintBase的类:
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// PrintBase.cs
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using System;
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using System.Collections.Generic;
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using System.ComponentModel;
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using System.Windows.Media.Imaging;
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using System.Text;
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namespace PhotoDemo
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{
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public class PrintBase : INotifyPropertyChanged
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{
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#region public property
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private BitmapSource _photo;
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public BitmapSource Photo
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{
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set { _photo = value; OnPropertyChanged("Photo"); }
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get { return _photo; }
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}
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private PrintType _PrintType;
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public PrintType PrintType
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{
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set { _PrintType = value; OnPropertyChanged("PrintType"); }
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get { return _PrintType; }
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}
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private int _quantity;
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public int Quantity
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{
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set { _quantity = value; OnPropertyChanged("Quantity"); }
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get { return _quantity; }
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}
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#endregion public property
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public PrintBase(BitmapSource photo, PrintType printtype, int quantity)
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{
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Photo = photo;
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PrintType = printtype;
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Quantity = quantity;
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}
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public PrintBase(BitmapSource photo, string description, double cost)
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{
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Photo = photo;
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PrintType = new PrintType(description, cost);
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Quantity = 0;
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}
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public event PropertyChangedEventHandler PropertyChanged;
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private void OnPropertyChanged(String info)
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{
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if (PropertyChanged != null)
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PropertyChanged(this, new PropertyChangedEventArgs(info));
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}
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public override string ToString()
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{
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return PrintType.ToString();
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}
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}
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}
这里有三个可读写属性:Photo, PrintType和Quantity(表示片的数量),还设置了一个PropertyChanged委托,用于当属性变更时做相应的事件处理。
6. 继承自PrintBase的三个类:Print, GreetingCard, TShirt, 分别用来打印,制成贺卡及制作T恤衫。
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// Print.cs
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using System;
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using System.Collections.Generic;
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using System.Windows.Media.Imaging;
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using System.Text;
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namespace PhotoDemo
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{
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public class Print : PrintBase
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{
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public Print(BitmapSource photo) : base(photo, "4x6 Print", 0.15) { }
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}
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}
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// TShirt.cs
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using System;
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using System.Collections.Generic;
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using System.Windows.Media.Imaging;
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using System.Text;
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namespace PhotoDemo
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{
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public class TShirt : PrintBase
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{
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public TShirt(BitmapSource photo) : base(photo, "T-Shirt", 14.99) { }
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}
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}
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// GreetingCard.cs
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using System;
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using System.Collections.Generic;
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using System.Windows.Media.Imaging;
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using System.Text;
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namespace PhotoDemo
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{
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public class GreetingCard : PrintBase
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{
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public GreetingCard(BitmapSource photo) : base(photo, "Greeting Card", 1.49) { }
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}
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}
7. "印"的集合:PrintList
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// PrintList.cs
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using System;
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using System.Collections.ObjectModel;
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namespace PhotoDemo
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{
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public class PrintList : ObservableCollection<PrintBase> { }
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}
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