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带进度条的ListView(一)
2017-10-10 12:06:46 】 浏览:10085
Tags:进度 ListView

1

unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls, ComCtrls, ImgList;

type
  TForm1 = class(TForm)
    btn1: TButton;
    lv1: TListView;
    trckbr1: TTrackBar;
    il1: TImageList;
    procedure lv1CustomDraw(Sender: TCustomListView; const ARect: TRect; var DefaultDraw: Boolean);
    procedure lv1CustomDrawItem(Sender: TCustomListView; Item: TListItem; State: TCustomDrawState; var DefaultDraw: Boolean);
    procedure btn1Click(Sender: TObject);
    procedure trckbr1Change(Sender: TObject);
  private
    function ReDrawItem(HwndLV: HWND; ItemIndex: integer): boolean;
{ Private declarations }
  public
{ Public declarations }
  end;

var
  Form1: TForm1;

implementation

uses
  CommCtrl;

{$R *.dfm}
//代码来源:http://www.cnblogs.com/snow001x/archive/2008/12/04/1347854.html

//画状态条
procedure DrawSubItem(LV: TListView; Item: TListItem; SubItem: Integer; Prosition: Single; Max, Style: Integer; IsShowProgress: Boolean; DrawColor: TColor = $00005B00; FrameColor: TColor = $00002F00);
//获取SubItem的区域

  function GetItemRect(hWndLV: HWnd; iItem, iSubItem: Integer): TRect;
  var
    Rect: TRect;
  begin
    ListView_GetSubItemRect(hWndLV, iItem, iSubItem, iSubItem, @Rect);
    Result := Rect;
  end;

var
  PaintRect, R: TRect;
  i, iWidth, x, y: Integer;
  S: string;
begin
  with lv do
  begin
    PaintRect := GetItemRect(lv.Handle, Item.Index, SubItem);
    R := PaintRect;
    if Prosition >= Max then
      Prosition := 100
    else
    begin
      if Prosition <= 0 then
        Prosition := 0
      else
        Prosition := Round((Prosition / MAX) * 100);
    end;
    if (Prosition = 0) and (not IsShowProgress) then
      Canvas.FillRect(r) //如果是0 ,直接显示空白
    else
    begin
//先填充背景
      Canvas.FillRect(r);
      Canvas.Brush.Color := Color;
//画一个外框
      InflateRect(R, -2, -2);
      Canvas.Brush.Color := FrameColor;
      Canvas.FrameRect(R);
      Canvas.Brush.Color := Color;
      InflateRect(R, -1, -1);
//InflateRect(R,-1,-1);
//根据百分比计算出要花的进度条内容概述
      iWidth := R.Right - Round((R.Right - R.Left) * ((100 - Prosition) / 100));
      case Style of
        0: //实心
          begin
            Canvas.Brush.Color := DrawColor;
            R.Right := iWidth;
            Canvas.FillRect(R);
          end;
        1: //竖线填充
          begin
            i := r.Left;
            while i < iWidth do
            begin
              Canvas.Pen.Color := Color;
              Canvas.MoveTo(i, R.Top);
              Canvas.Pen.Color := DrawColor;
              Canvas.LineTo(i, R.Bottom);
              Inc(i, 3);
            end;
          end;
      end; //case end
//画好进度条后,现在要做的就是显示进度数字了
      Canvas.Brush.Style := bsClear;
      if Prosition = Round(Prosition) then
        S := Format('%d%%', [Round(Prosition)])
      else
        S := FormatFloat('#0.0', Prosition);
      with PaintRect do
      begin
        x := Left + (Right - Left + 1 - Canvas.TextWidth(S)) div 2;
        y := Top + (Bottom - Top + 1 - Canvas.TextHeight(S)) div 2;
      end;
      SetBkMode(Canvas.Handle, TRANSPARENT);
      Canvas.TextRect(PaintRect, x, y, S);
    end;
//画完恢复
    Canvas.Brush.Color := Color;
  end;
end;

procedure TForm1.lv1CustomDraw(Sender: TCustomListView; const ARect: TRect; var DefaultDraw: Boolean);
begin

end;

//上面是画进度条的,现在要给TlistView处理Item重绘的消息,事件是OnCustomDrawItem,需要说明的是,如果想要随心所欲的自画Item,那么就要全部自己来完成,不再需要系统来处理:
procedure TForm1.lv1CustomDrawItem(Sender: TCustomListView; Item: TListItem; State: TCustomDrawState; var DefaultDraw: Boolean);
var
  BoundRect, Rect: TRect;
  i: integer;
  TextFormat: Word;
  LV:
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