/// <summary>
/// 取当前GIF宽度高度
/// </summary>
/// <param name="gif">AnimatedGIF</param>
/// <param name="width">宽</param>
/// <param name="height">高</param>
public static void GetWidthHeight(AnimatedGIF gif, ref double width, ref double height)
{
//通过Drawing.Image取宽高
Bitmap gb = gif.Bitmap;
MemoryStream ms = new MemoryStream();
gb.Save(ms, gb.RawFormat);
System.Drawing.Image dimg = System.Drawing.Image.FromStream(ms);
width = dimg.Width;
height = dimg.Height;
ms.Dispose();
ms.Close();
}
private static void BindSource(AnimatedGIF gif)
{
gif.StopAnimate();
if (gif.Bitmap != null)
{
gif.Bitmap.Dispose();
}
object source = gif.GIFSource;
if (source == null)
{
return;
}
//根据类型处理
string sourcetype = source.GetType().ToSafeString();
if (sourcetype.Contains("System.String"))
{
//文件路径
string path = source.ToSafeString();
if (path.IsInvalid())
{
return;
}
if (!Path.IsPathRooted(path))
{
source = File.GetPhysicalPath(path);
}
gif.Bitmap = new Bitmap(path);
}
else if (sourcetype.Contains("System.IO.Stream"))
{
//io.Stream
gif.Bitmap = new Bitmap(source as Stream);
}
else if (sourcetype.Contains("System.IO.MemoryStream"))
{
//io.MemoryStream
gif.Bitmap = new Bitmap(source as MemoryStream);
}
else
{
//无效
throw new Exception("Unsupported Stream");
}
GetWidthHeight(gif, ref imgw, ref imgh);
gif.BitmapSource = GetBitmapSource(gif.Bitmap, gif.BitmapSource);
gif.StartAnimate();
}
/// <summary>
/// 属性更改处理事件
/// </summary>
private static void OnSourcePropertyChanged(DependencyObject sender, DependencyPropertyChangedEventArgs args)
{
AnimatedGIF gif = sender as AnimatedGIF;
if (gif == null)
{
return;
}
if (!gif.IsLoaded)
{
return;
}
BindSource(gif);
}
/// <summary>
/// 设置图片缩放
/// </summary>
/// <param name="zoom">true自适应</param>
/// <param name="begin">首次显示</param>
public void ImgZoom(bool zoom, bool begin)
{
if (imgType == null)
{
return;
}
double imgw = 0, imgh = 0;
AnimatedGIF gifo = null;
bool isani = false;
UIElement imgui = prewimg.Children[0];
//分类型取值
switch (imgType)
{
case "bmp":
case "jpg":
case "png":
Image img = (Image)imgui;
BitmapImage bi = (BitmapImage)img.Source;
imgw = bi.PixelWidth;
imgh = bi.PixelHeight;
break;
case "gif":
AnimatedGIF gif = (AnimatedGIF)imgui;
gifo = gif;
isani = true;
break;
}
if (begin)
{
if (isani)
{
imgw = prew.Descs[prew.SelectedId].Width;
imgh = prew.Descs[prew.SelectedId].Height;
if (imgw < 1 || imgh < 1)
{
imgw = imgh = double.NaN;
}
}
if (zoom && imgw > prew.imgGrid.ActualWidth || zoom && imgh > prew.imgGrid.ActualHeight)
{
Width = Height = double.NaN;
}
else
{
Width = imgw;
Height = imgh;
zoom = false;
}
}
else
{
if (zoom)
{
Width = Height = double.NaN;
}
else if (isani)
{
AnimatedGIF.GetWidthHeight(gifo, ref imgw, ref imgh);
Width = imgw;
Height = imgh;
}
else
{
Width = imgw;
Height = imgh;
}
}
isZoom = zoom;
}
/// <summary>
/// 显示预览
/// </summary>
/// <param name="str">各种Stream</param>
/// <param name="key">img.ID</param>
private void AssignImg(Stream str, int key)
{
//流下载完毕
try
{
//提取图片规格类型
string type = GetImgType(str);
imgType = type;
//记录Stream
strs = str;
//分显示容器
switch (type)
{
case "bmp":
case "jpg":
case "png":
//静态图片格式转化
System.Drawing.Image dimg = System.Drawing.Image.FromStream(str);
MemoryStream ms = new MemoryStream();
dimg.Save(ms, imgf[type]);
BitmapImage bi = new BitmapImage();
bi.BeginInit();
bi.StreamSource = new MemoryStream(ms.ToArray()); //ms不能直接用
bi.EndInit();
ms.Close();
//创建静态图片控件
Image img = new Image()
{
Source = bi,
Stretch = Stretch.Uniform,
SnapsToDevicePixels = true,
StretchDirection = StretchDirection.Both,
Margin = new Thickness()
{
Top = 0, Right = 0, Bottom = 0, Left = 0
}
};
//将预览控件加入布局
prewimg.Children.Add(img);
break;
case "gif":
//创建GIF动图控件
AnimatedGIF gif = new AnimatedGIF()
{
GIFSource = str,
Stretch = Stretch.Uniform,
SnapsToDevicePixels = true,
StretchDirection = StretchDirection.Both
};
//将预览控件加入布局
prewimg.Children.Add(gif);
break;
default:
//未支持预览的格式
Dispatcher.Invoke(new UIdelegate(delegate(object ss) { StopLoadImg(key, "不支持" + type); }), "");
return;
}
//选中的预览图显示出来
if (key == prew.SelectedId)
{
Visibility = Visibility.Visible;
}
//隐藏进度条
ProgressPlate.Visibility = Visibility.Hidden;
ImgZoom(true);
imgloaded = true;
}
catch (Exception ex1)
{
Program.Log(ex1, "Read sample img failed");
Dispatcher.Invoke(new UIdelegate(delegate(object ss) { StopLoadImg(key, true, "读取数据失败"); }), ex1);
}
}
