private static void RunLoading(string url, string path, PictureBox picture, TextBox box = null)
{
new Thread(() =>
{
Timer loadingTimer = null;
if (!BstPicLoader.LoadingTimers.ContainsKey(picture))
{
// 更新图片成读取状态，如果Dictionary里已经有这个PictureBox的Timer了，说明loading图已经加载了
var loadingGif = new BstGifImage(BstManager.PathLoadingGif)
{
ReverseAtEnd = false
};
loadingTimer = new Timer(50);
loadingTimer.Elapsed += (s, e) =>
{
MethodInvoker loadingAction = () =>
{
picture.Image = loadingGif.GetNextFrame();
};
try
{
picture.BeginInvoke(loadingAction);
}
catch (InvalidOperationException ex)
{
BstLogger.Instance.Log(ex.ToString());
// 因为我们可能会在GUI_Picture的UI中的PictureBox里显示loading动态图
// 而上述的窗口可能在关闭后被销毁，这里我们需要处理窗口被销毁后的错误
// 这时候Timer应该在Dictionary里注册过了
if (BstPicLoader.LoadingTimers.ContainsKey(picture))
{
var timer = BstPicLoader.LoadingTimers[picture];
timer.Enabled = false;
BstPicLoader.LoadingTimers.Remove(picture);
timer.Dispose();
}
}
};
BstPicLoader.LoadingTimers.Add(picture, loadingTimer);
loadingTimer.Enabled = true;
}
else
{
loadingTimer = BstPicLoader.LoadingTimers[picture];
}
// 检查是否有本地缓存
byte[] blob = null;
if (File.Exists(path))
{
// 本地缓存存在，直接读取
blob = BstManager.GetBytesFromFile(path);
}
else
{
// 下载图片
blob = BstManager.DownloadImageFile(url, path);
if (blob == null)
{
// 图片下载失败
BstManager.ShowMsgInTextBox(box, string.Format(BstI18NLoader.Instance.LoadI18NValue("BstPicLoader", "picDownloadFailed"), url));
// 停止动态图更新
loadingTimer.Enabled = false;
BstPicLoader.LoadingTimers.Remove(picture);
loadingTimer.Dispose();
// 更新下载失败icon
var errorIconBitmap = BstManager.ConvertByteToImage(BstManager.Instance.ErrorIconBytes);
MethodInvoker updateErrorAction = () => picture.Image = errorIconBitmap;
try
{
picture.BeginInvoke(updateErrorAction);
}
catch (Exception ex)
{
BstLogger.Instance.Log(ex.ToString());
}
return;
}
}
loadingTimer.Enabled = false; // 加载完成，停止动态loading图的更新
BstPicLoader.LoadingTimers.Remove(picture); // 加载完成，删除Dictionary里注册的Timer
loadingTimer.Dispose();
BstManager.ShowMsgInTextBox(box, string.Format(BstI18NLoader.Instance.LoadI18NValue("BstPicLoader", "picDownloadSucceed"), url));
// 转换成位图
var bitmap = BstManager.ConvertByteToImage(blob);
// 更新图片内容
MethodInvoker updateAction = () => picture.Image = bitmap;
try
{
picture.BeginInvoke(updateAction);
}
catch (Exception ex)
{
BstLogger.Instance.Log(ex.ToString());
}
}).Start();
}
public void Run()
{
var updatedCount = 0;
var isAnyTaskLeft = true;
while (isAnyTaskLeft)
{
var task = this._queue.Dequeue();
// 加载图片
byte[] pic = null;
var downloadUrl = BstManager.GetIconPicUrl(task.ElementData);
var imgCachePath = BstManager.GetIconPicTmpPath(task.ElementData);
if (File.Exists(imgCachePath))
{
// 已有缓存文件
pic = BstManager.GetBytesFromFile(imgCachePath);
}
else
{
// 没有缓存文件，需要下载
pic = BstManager.DownloadImageFile(downloadUrl, imgCachePath);
}
// 检查结果并更新UI
if (pic == null)
{
BstManager.ShowMsgInTextBox(task.Box, string.Format(BstI18NLoader.Instance.LoadI18NValue("BstIconLoader", "iconDownloadFailed"), downloadUrl));
// 更新加载失败icon
task.Table.Rows[task.RowId][task.ColId] = BstManager.Instance.ErrorIconBytes;
}
else
{
BstManager.ShowMsgInTextBox(task.Box, string.Format(BstI18NLoader.Instance.LoadI18NValue("BstIconLoader", "iconDownloadSucceed"), downloadUrl));
// 更新图片
task.Table.Rows[task.RowId][task.ColId] = pic;
}
// 检查icon加载进度，并刷新ui
updatedCount++;
if (updatedCount >= BstIconLoader.UpdateThrottle)
{
MethodInvoker tableUpdateAction = () => task.Grid.Refresh();
try
{
task.Grid.BeginInvoke(tableUpdateAction);
}
catch (Exception ex)
{
BstLogger.Instance.Log(ex.ToString());
}
updatedCount = 0;
}
if (this._queue.Count != 0)
{
continue; // 仍旧还有工作未完成，继续轮询
}
// 当前工作队列已清空，最后更新UI，设置关闭状态
MethodInvoker tableFinalUpdateAction = () => task.Grid.Refresh();
task.Grid.BeginInvoke(tableFinalUpdateAction);
BstManager.DisplayDataGridViewVerticalScrollBar(task.Grid);
BstManager.ShowMsgInTextBox(task.Box, BstI18NLoader.Instance.LoadI18NValue("BstIconLoader", "iconDownloadAllDone"));
BstLogger.Instance.Log("[BstIconLoader] Queued works all done, thread exit ...");
isAnyTaskLeft = false;
}
}