Question

Assuming that you know about drop box(no problem if you don t know).

In my desktop application there is an upload functionality. I want to mark correct sign on file icon at bottom left after upload.(same as Dropbox does).

How can I do that? What s that trick?

Answer 1

DropBox是空壳的延伸,因此它使用SOS信标,并超支。

在您的案例中,如果你在桌面上提出申请,你就能够用类似内容超标:

    private static object mOverlayLock = new object();
    public static Image GetOverlayedImage(Image baseImage, Image overlay)
    {
        Image im = null;

        lock (mOverlayLock)
        {
            try
            {
                im = baseImage.Clone() as Image;

                Graphics g = Graphics.FromImage(im);
                g.DrawImage(overlay, 0, 0, im.Width, im.Height);
                g.Dispose();
            }
            catch
            {
                // LOG EXCEPTION!!
            }
        }

        return im;
    }

这是一个基本的例子。你们也可以采取超额立场,即(偷窃、中转......),这需要略微增加方案规划。

然后,从你的申请来看,你可以把这种方法引向结果。例如

...
Image folderIcon = GetFolderIcon();
Image upToDateOverlay = GetUpToDateOverlay();
Image folderUptoDate = GetOlverlayedImage(folderIcon, upToDateOverlay);
// Then assign this image to your control item (treelistnode, listViewnode, whatever)

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