类似AcdSee的图像浏览功能；实现图像的缩放显示功能，支持原始大小，适合宽度，适合高度，适合屏幕；有文件目录浏览窗口；位图浏览窗口-Similar AcdSee image browsing of image zoom display function, support the original size, fit width, fit height, fit the screen a file directory browser window bitmap browser window