public StorageEntry(StorageFile file, StorageEntryUsage usage)
{
this.EntryType = StorageEntryType.File;
this.ContentType = SEContentAgency.AnyalizeStorageEntryContent(file);
this._storageItem = file;
this.LoadThumbnail(usage);
}
// Constructor
public StorageEntry(StorageFolder folder, StorageEntryUsage usage)
{
this.EntryType = StorageEntryType.Folder;
this.ContentType = SEContent.Folder;
this._storageItem = folder;
this.LoadThumbnail(usage);
}
public StorageEntry(IStorageItem item, StorageEntryUsage usage)
{
if (item is StorageFile file)
{
this.EntryType = StorageEntryType.File;
this.ContentType = SEContentAgency.AnyalizeStorageEntryContent(file);
this._storageItem = item;
this.LoadThumbnail(usage);
}
else
{
this.EntryType = StorageEntryType.Folder;
this.ContentType = SEContent.Folder;
this._storageItem = item;
this.LoadThumbnail(usage);
}
}
public static async Task <StorageEntryLoadInfo> LoadMoreStorageItemAsync(StorageFolder destFolder, ObservableCollection <StorageEntry> collection, StorageEntryUsage usage, StorageEntryLoadInfo info)
{
IReadOnlyList <IStorageItem> storageItems = null;
if (info.LeavingCount < PreferenceAgency.Default.MaxLoadCount)
{
storageItems = await destFolder.GetItemsAsync(info.loadedCount, info.LeavingCount);
info.loadedCount = info.entriesCount;
info.isLoadedAll = true;
}
else
{
storageItems = await destFolder.GetItemsAsync(info.loadedCount, PreferenceAgency.Default.MaxLoadCount);
info.loadedCount += PreferenceAgency.Default.MaxLoadCount;
}
foreach (var eachItem in storageItems)
{
var newEntry = new StorageEntry(eachItem, usage);
collection.Add(newEntry);
}
return(info);
}
public static async Task <StorageEntryLoadInfo> LoadStorageFolderAsync(StorageFolder destFolder, ObservableCollection <StorageEntry> collection, StorageEntryUsage usage)
{
var itemsCount = Directory.GetFileSystemEntries(destFolder.Path, "*", SearchOption.TopDirectoryOnly).Length;
StorageEntryLoadInfo info;
info.entriesCount = (uint)itemsCount;
info.path = destFolder.Path;
IReadOnlyList <IStorageItem> storageItems = null;
if (itemsCount > PreferenceAgency.Default.InitialMaxLoadCount)
{
storageItems = await destFolder.GetItemsAsync(0, PreferenceAgency.Default.InitialMaxLoadCount);
info.isLoadedAll = false;
info.loadedCount = PreferenceAgency.Default.InitialMaxLoadCount;
}
else
{
storageItems = await destFolder.GetItemsAsync();
info.isLoadedAll = true;
info.loadedCount = info.entriesCount;
}
foreach (var eachItem in storageItems)
{
var newEntry = new StorageEntry(eachItem, usage);
collection.Add(newEntry);
}
return(info);
}
// http://www.cnblogs.com/hebeiDGL/archive/2012/09/27/2705478.html
// Configure Thumbnail
private async void LoadThumbnail(StorageEntryUsage usage)
{
switch (this.EntryType)
{
case StorageEntryType.File:
this.ThumbSource = new BitmapImage();
StorageItemThumbnail thumbnail = null;
switch (usage)
{
case StorageEntryUsage.TilesFieldItem:
case StorageEntryUsage.ColumnFieldItem:
thumbnail = await File.GetThumbnailAsync(
SEContentAgency.FieldItemThumbnailModes[(int)ContentType],
60, // Requested size
ThumbnailOptions.ReturnOnlyIfCached); // TODO: Test the ThumbnailOptions
break;
case StorageEntryUsage.PanelPreview:
thumbnail = await File.GetThumbnailAsync(
SEContentAgency.PanelPreviewThumbnailModes[(int)ContentType],
150, // Requested size
ThumbnailOptions.UseCurrentScale);
break;
case StorageEntryUsage.ParentFolder:
this.ThumbSource = null;
return; // 没有必要加载该文件夹的略缩图,直接结束本方法
}
if (thumbnail is null)
{
switch (usage)
{
case StorageEntryUsage.ColumnFieldItem:
case StorageEntryUsage.TilesFieldItem:
this.ThumbSource.UriSource = SEContentAgency.GetDefaultThumbnailUri(this.ContentType); break;
case StorageEntryUsage.PanelPreview:
this.ThumbSource.UriSource = SEContentAgency.GetDefaultPreviewUri(this.ContentType); break;
}
}
else
{
this.ThumbSource.SetSource(thumbnail);
}
break;
case StorageEntryType.Folder:
switch (usage)
{
case StorageEntryUsage.TilesFieldItem:
case StorageEntryUsage.ColumnFieldItem:
this.ThumbSource = new BitmapImage(new Uri("ms-appx:///Assets/THUMB/Folder_Small.png")); break;
case StorageEntryUsage.PanelPreview:
this.ThumbSource = new BitmapImage(new Uri("ms-appx:///Assets/THUMB/Folder_Medium.png")); break;
case StorageEntryUsage.ParentFolder:
this.ThumbSource = null;
return; // 没有必要加载该文件夹的略缩图,直接结束本方法
}
break;
}
}
