队列与DelphiXe新语法 

好久没写代码了，更久没上博客园的博客了，无聊写几行试一下新语法。

  1 unit Main;
  2 
  3 interface
  4 
  5 uses
  6   Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
  7   Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Vcl.ComCtrls,
  8 
  9   iHome.Helper.Telegram,
 10   Generics.Collections;
 11 
 12 type
 13   TMainForm = class(TForm)
 14     ListView_Queue: TListView;
 15     btEnQueue: TButton;
 16     btDeQueue: TButton;
 17     procedure btEnQueueClick(Sender: TObject);
 18   private
 19     { Private declarations }
 20       FPriorityQueue:TQueue<PTelegram>;
 21 
 22       procedure SetupListView(ListView:TListView);
 23       procedure ViewQueue(ListView:TListView;PriorityQueue:TQueue<PTelegram>);
 24   public
 25     { Public declarations }
 26   end;
 27 
 28 var
 29   MainForm: TMainForm;
 30 
 31 implementation
 32 
 33 {$R *.dfm}
 34 
 35 
 36 procedure TMainForm.SetupListView(ListView: TListView);
 37   procedure SetupListViewColumns(Columns:TListColumns);
 38   begin
 39     Columns.Clear;
 40     TListColumn(Columns.Add).Caption:='Caption';
 41     TListColumn(Columns.Add).Caption:='Message';
 42     TListColumn(Columns.Add).Caption:='Sender';
 43     TListColumn(Columns.Add).Caption:='Receiver';
 44     TListColumn(Columns.Add).Caption:='DispatchTime';
 45     TListColumn(Columns.Add).Caption:='ExtraInfo';
 46    end;
 47 begin
 48   ListView.ViewStyle:=vsReport;//报表格式显示
 49   SetupListViewColumns(ListView.Columns); //设置显示列名
 50 end;
 51 
 52 procedure TMainForm.ViewQueue(ListView:TListView;PriorityQueue:TQueue<PTelegram>);
 53 var
 54   FpTelegram:PTelegram;
 55   procedure ViewQueueItem(ListItem:TListItem);
 56   begin
 57     with ListItem do
 58     begin
 59       Caption := IntToStr(FpTelegram^.msg);
 60       SubItems.Add(IntToStr(FpTelegram^.msg));
 61       SubItems.Add(IntToStr(FpTelegram^.Sender));
 62       SubItems.Add(IntToStr(FpTelegram^.Receiver));
 63       SubItems.Add(IntToStr(FpTelegram^.DispatchTime));
 64       SubItems.Add(IntToStr(FpTelegram^.ExtraInfo));
 65     end;
 66   end;
 67 begin
 68   try
 69     ListView.Items.BeginUpdate;
 70     ListView.Clear;
 71     SetupListView(ListView);//设置ListView显示设置
 72     for FpTelegram in PriorityQueue do ViewQueueItem(ListView.Items.Add);//显示队列项目
 73   finally
 74     ListView.Items.EndUpdate
 75   end;
 76 end;
 77 
 78 procedure TMainForm.btEnQueueClick(Sender: TObject);
 79 var
 80   FTelegram:PTelegram;
 81 
 82   function MakerQueue(Max:Integer):TQueue<PTelegram>;
 83   var
 84     i:Integer;
 85   begin
 86     Result:=TQueue<PTelegram>.Create;//创建优先队列
 87     for I := 0 to Max do
 88     begin
 89       New(FTelegram);
 90       with FTelegram^ do
 91       begin
 92         DispatchTime:=GetTickCount;
 93         Sender:=Self.Handle;
 94         Receiver:=Self.Handle;
 95         Msg:=i;
 96         ExtraInfo:=0;
 97       end;
 98       Result.Enqueue(FTelegram);//入队
 99     end;
100   end;
101 
102 begin
103   if FPriorityQueue=nil then
104     FPriorityQueue:=MakerQueue(15);//创建15个队列项目
105   ViewQueue(ListView_Queue,FPriorityQueue);//ListView显示队列
106 end;
107 
108 end.

 

posted @ 2014-12-20 21:58  云水浮萍  阅读(1116)  评论(0)    收藏  举报