Delphi在Listview中加入Edit控件

unit Unit1;  
  
interface  
  
uses  
   Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,   
  Dialogs, ComCtrls, CommCtrl, StdCtrls, ImgList;  
  
type  
  TForm1 = class(TForm)  
    ListView1: TListView;  
    Edit1: TEdit;  
    procedure Edit1KeyDown(Sender: TObject; var Key: Word;  
      Shift: TShiftState);  
    procedure Edit1Change(Sender: TObject);  
    procedure ListView1MouseDown(Sender: TObject; Button: TMouseButton;  
      Shift: TShiftState; X, Y: Integer);  
    procedure FormCreate(Sender: TObject);  
    procedure ListView1ColumnDagged(Sender: TObject);  
  private  
    { Private declarations }  
  
    FListViewWndProc1: TWndMethod;  
    procedure ListViewWndProc1(var Msg: TMessage);  
  public  
    { Public declarations }  
  end;  
  
const MaxColumns=3 ;  //   总Columns-1  
var  
  Form1: TForm1;  
  edtcol:integer; //记录EDIT1在Columns中的位置,1-  MaxColumns;  
  editem:Tlistitem;  
implementation  
  
{$R *.dfm}  
  
//拦截LISTVIEW1消息  
procedure  TForm1.ListViewWndProc1(var Msg: TMessage);  
var IsNeg : Boolean;  
begin  
 try  
  ShowScrollBar(ListView1.Handle, SB_HORZ, false);  
  
  //拖动Listview1滚动条时,将EDIT1隐藏起来  
  if(msg.Msg  =WM_VSCROLL) or (msg.Msg=WM_MOUSEWHEEL ) then edit1.Visible :=false;  
  if Msg.Msg = WM_MOUSEWHEEL then  
   begin  
    if listview1.Selected=nil then exit;  
    IsNeg := Short(msg.WParamHi) < 0;  
    listview1.SetFocus ;  
    if IsNeg then  
        SendMessage(edit1.Handle,  WM_KEYDOWN,  VK_down,  0)  
    else  
         SendMessage(edit1.Handle,  WM_KEYDOWN,  VK_up, 0);  
  end  
  else  
   FListViewWndProc1(Msg);  
 except  
 end;  
end;  
  
//拦截EDIT的按键消息，对上、下、左、右方向键进行处理------  
procedure TForm1.Edit1KeyDown(Sender: TObject; var Key: Word;  
  Shift: TShiftState);  
var item:tlistitem;  
    ix,lt,i:integer;  
    rect:Trect;  
begin  
TRY  
  //----对上、下、左、右方向键进行处理-----------------  
  if(key<>VK_DOWN) AND (KEY<>VK_UP)  AND (KEY<>VK_RIGHT)  AND (KEY<>VK_LEFT)  THEN EXIT;  
  IF(KEY=VK_RIGHT) THEN  //键盘右键  
   BEGIN  
     //按下键盘右键后,判断光标位置是否处于最右边,如果不在最右边,不作处理 EXIT  
    if length(edit1.Text)>edit1.SelStart then exit;  
     item:=listview1.Selected;  
     //计算edit1位于哪个Columns,如果<最大Columns,+1,否则=1,即转到最左边  
  
   if(edtcol  
  
    //从 edtcol值计算出 Columns的位置(Left,width),EDIT1按此设置  
     lt:=0;  
     for i:=0 to edtcol-1 do lt:=lt+listview1.Columns[i].Width;  
     edit1.Left:=lt+1;  
     edit1.Width :=listview1.Columns[edtcol].Width;  
  END;  
    IF(KEY=VK_left) THEN  //键盘左键  
   BEGIN  
     if edit1.SelStart<>0 then exit;  
     item:=listview1.Selected;  
     if(edtcol>0) then  edtcol:=edtcol-1 else edtcol:=MaxColumns;  
     lt:=0;  
     for i:=0 to edtcol-1 do lt:=lt+listview1.Columns[i].Width;  
     edit1.Left:=lt+1;  
     edit1.Width :=listview1.Columns[edtcol].Width;  
  END;  
  if(key=VK_DOWN ) then     //键盘下键  
   begin  
     item:=listview1.Selected;  
     if item=nil then exit;  
     ix:=item.Index;  
     if ix>=listview1.Items.Count-1 then exit;  
      SendMessage(listview1.Handle,  WM_KEYDOWN,  VK_down,  0)  
   end;  
  if(key=VK_UP) then  //键盘上键  
   begin  
     item:=listview1.Selected;  
     if item=nil then exit;  
     ix:=item.Index;  
     if ix<1 then exit;  
     SendMessage(listview1.Handle,  WM_KEYDOWN,  VK_up,  0)  
   end;  
   listview1.ItemFocused :=listview1.Selected;  
   item:=listview1.Selected ;  
   edit1.Visible :=false;  
   rect:=item.DisplayRect(drSelectBounds);  
   edit1.SetBounds(edit1.left,rect.Top-1,edit1.Width,rect.Bottom-rect.Top+2);  
   IF edtcol>0 then edit1.Text:=item.SubItems[edtcol-1]  
               else edit1.Text:=item.Caption ;  
   edit1.Visible:=true;  
   edit1.SetFocus;  
  
EXCEPT  
END;  
end;  
  
  
//编辑控件内容改变后,保存改变到Listview1对应位置  
procedure TForm1.Edit1Change(Sender: TObject);  
begin  
TRY  
    if not edit1.Visible then exit;  
    listview1.Selected.SubItems[edtcol-1]:=edit1.Text;  
EXCEPT  
END;  
end;  
//在LISTVIEW1上按下鼠标  
procedure TForm1.ListView1MouseDown(Sender: TObject; Button: TMouseButton;  
  Shift: TShiftState; X, Y: Integer);  
var  
 rect:Trect;  
 p:tpoint;  
 wtmp,i:integer;  
begin  
TRY  
  //显示编辑控件  
  edit1.Visible:=false;  
  //根据鼠标位置，得到所对应行的LISTITEM  
  editem:=listview1.GetItemAt(x,y);  
  if editem<>nil then  
  begin  
   //根据鼠标位置，计算出是哪个 Columns.  
   p:=editem.Position;  
   wtmp:=p.X;  
   for i:=0 to listview1.Columns.Count-1 do  
   if (x>wtmp) and (x<(wtmp+listview1.Column[i].Width))  
     then  break  //找到对应的Columns,打断退出，I确定.  
     else  inc(wtmp,listview1.Column[i].Width);  
   //根据I的值，取得 Columns的对应位置。在对应位置按其它的SIZE放EDIT1。  
   edtcol:=i;  
   rect:=editem.DisplayRect(drSelectBounds);  
   edit1.SetBounds(wtmp-1,rect.Top-1,listview1.Column[i].Width+1,rect.Bottom-rect.Top+2);  
   if edtcol>0 then edit1.Text:=editem.SubItems[i-1]  
               else edit1.Text:=editem.Caption;  
   edit1.Visible:=true;  
   edit1.SetFocus;  
  end;  
EXCEPT  
END;  
end;  
//初始化,加入测试数据.  
procedure TForm1.FormCreate(Sender: TObject);  
var item:tlistitem;  
    i:integer;  
begin  
  
 //将edit1的父亲选为LISTVIEW1,用以响应LISTVIEW1消息  
  
 edit1.parent:=Listview1;  
  
 //拦载LISTVIEW1鼠标消息  
  
  FListViewWndProc1:=ListView1.WindowProc;  
  ListView1.WindowProc := ListViewWndProc1;  
   
  
  for  i:=0 to 10 do  
   begin  
      item:=listview1.Items.Add ;  
      item.Caption :=‘123324‘;  
      item.SubItems.Add(‘32r5aefs‘);  
      item.SubItems.Add(‘SGASD‘);  
      item.SubItems.Add(‘3445645‘);  
   end;  
end;