标签:
(* ************************************************* 1、里面放多张图片,用文件名作为索引 2、线程在背后从硬盘加载到内存 3、批量加载 4、加载完成后执行回调,回调是线程安全的 5、回调中的参数是新加载了多少张图片 ************************************************** *) unit BitmapList; interface uses ystem.SysUtils, System.Classes, FMX.Graphics, Generics.Collections, xSuperObject, xSuperJson, UrlMon, IdURI, DateUtils; type TBitmapList = class(TDictionary<string, TBitmap>) private public RPath, LPath: string; // url路径,本地路径 function CreateDirPath(url: string): string; // 生成路径 function GetSubDateTime(S1, S2: string): string; // 获取两个时间间隔 procedure LoadFromFiles(s: string; callback: TProc < Integer >= nil); overload; // 加载一个或逗号分隔的多个图片文件名 procedure LoadFromFiles(ss: TStrings; callback: TProc < Integer >= nil);overload; // TStrings 的多个图片文件名 procedure LoadFromFiles(ja: ISuperArray; callback: TProc < Integer >= nil); overload; // jo 的多个图片文件名 procedure LoadFromFiles(ja: ISuperArray; k: string; callback: TProc < Integer >= nil); overload; // ja.O[i].S[K]的多个图片文件名 ja里的某个值 end; implementation uses UnitLog; { TBitmapList } procedure TBitmapList.LoadFromFiles(s: string; callback: TProc<Integer>); var temp1, temp2: string; i, j: Integer; begin TThread.CreateAnonymousThread( procedure var i, n: Integer; t, t1: string; o: TBitmap; a: TArray<string>; begin n := 0; a := s.Split([‘,‘]); for i := 0 to length(a) - 1 do begin t := a[i]; if (t <> ‘‘) and (not ContainsKey(t)) then begin if (not FileExists(t)) and (RPath <> ‘‘) then begin t1 := t.Replace(RPath, LPath).Replace(‘/‘, ‘\‘); // 本地路径 if (UrlDownloadToFile(nil, PChar(TIdURI.URLEncode(t)), PChar(t1), 0, nil) = 0) then t := t1 else t := ‘‘; end; if (t <> ‘‘) and (ContainsKey(t) = False) then begin o := TBitmap.Create; o.LoadFromFile(t); Add(t, o); Inc(n); end; end; end; if (Assigned(callback)) then TThread.Synchronize(TThread.CurrentThread, procedure begin callback(n); end); end).Start; end; procedure TBitmapList.LoadFromFiles(ss: TStrings; callback: TProc<Integer>); var s: string; i: Integer; begin for i := 0 to ss.Count - 1 do begin s := ss[i]; LoadFromFiles(s, callback); end; end; procedure TBitmapList.LoadFromFiles(ja: ISuperArray; k: string; callback: TProc<Integer>); var s: String; x: IMember; i: Integer; begin s := ‘‘; for x in ja do s := s + x.AsObject.s[k] + ‘,‘; s := s.TrimRight([‘,‘]); LoadFromFiles(s, callback); end; procedure TBitmapList.LoadFromFiles(ja: ISuperArray; callback: TProc<Integer>); var s: string; x: IMember; begin s := ‘‘; for x in ja do s := x.AsString; LoadFromFiles(s, callback); end;
标签:
原文地址:http://www.cnblogs.com/studypanp/p/4976650.html