ListView的使用技巧

    技术2022-05-11  73

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    //增加  i := ListView1.Items.Count;  with ListView1 do  begin    ListItem:=Items.Add;    ListItem.Caption:= IntToStr(i);    ListItem.SubItems.Add('第 '+IntToStr(i)+' 行');    ListItem.SubItems.Add('第三列内容');  end;//按标题删除  for i:=ListView1.Items.Count-1 downto 0 Do    if ListView1.Items[i].Caption = Edit1.Text then    begin      ListView1.Items.Item[i].Delete();  //删除当前选中行    end;//选中一行  if ListView1.Selected <> nil then  Edit1.Text := ListView1.Selected.Caption;//   listview1.Items[Listview1.Items.Count -1].Selected := True;//   listview1.Items[Listview1.Items.Count -1].MakeVisible(True);  procedure TForm1.Button2Click(Sender: TObject); // 选择第一条begin  listview1.SetFocus;  listview1.Items[0].Selected := True;end; name="google_ads_frame" marginwidth="0" marginheight="0" 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allowtransparency="allowtransparency"> procedure TForm1.Button1Click(Sender: TObject);  // 选择最后一条begin  listview1.SetFocus;  listview1.Items[Listview1.Items.Count -1].Selected := True;end;  //这是个通用的过程procedure ListViewItemMoveUpDown(lv : TListView; Item : TListItem; MoveUp, SetFocus : Boolean);var  DestItem : TListItem;begin  if (Item = nil) or     ((Item.Index - 1 < 0) and MoveUp) or     ((Item.Index + 1 >= lv.Items.Count) and (not MoveUp))    then Exit;  lv.Items.BeginUpdate;  try    if MoveUp then      DestItem := lv.Items.Insert(Item.Index - 1)    else      DestItem := lv.Items.Insert(Item.Index + 2);    DestItem.Assign(Item);    lv.Selected := DestItem;    Item.Free;  finally    lv.Items.EndUpdate;  end;  if SetFocus then lv.SetFocus;  DestItem.MakeVisible(False);end;//此为调用过程,可以任意指定要移动的Item,下面是当前(Selected)Item  ListViewItemMoveUpDown(ListView1, ListView1.Selected, True, True);//上移  ListViewItemMoveUpDown(ListView1, ListView1.Selected, False, True);//下移 TListView组件使用方法引用CommCtrl单元procedure TForm1.Button1Click(Sender: TObject);begin  ListView_DeleteColumn(MyListView.Handle, i);//i是要删除的列的序号,从0开始end;用LISTVIEW显示表中的信息:procedure viewchange(listv:tlistview;table:tcustomadodataset;var i:integer);  begin    tlistview(listv).Items.BeginUpdate;   {listv:listview名}    try      tlistview(listv).Items.Clear;      with table do         {table or query名}      begin        active:=true;        first;        while not eof do        begin          listitem:=tlistview(listv).Items.add;          listitem.Caption:=trim(table.fields[i].asstring);//          listitem.ImageIndex:=8;          next;        end;      end;    finally      tlistview(listv).Items.EndUpdate;    end; end;  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allowtransparency="allowtransparency"> ListView使用中的一些要点。以下以一个两列的ListView为例。  →增加一行:with ListView1 do  begin    ListItem:=Items.Add;    ListItem.Caption:='第一列内容';    ListItem.SubItems.Add('第二列内容');  end;  →清空ListView1:ListView1.Items.Clear;  →得到当前被选中行的行的行号以及删除当前行:For i:=0 to ListView1.Items.Count-1 Do  If ListView1.Items[i].Selected then  //i=ListView1.Selected.index    begin      ListView1.Items.Delete(i);  //删除当前选中行    end;当然,ListView有OnSelectItem事件,可以判断选择了哪行,用个全局变量把它赋值出来。  →读某行某列的操作:Edit1.Text := listview1.Items[i].Caption;  //读第i行第1列Edit2.Text := listview1.Items[i].SubItems.strings[0];  //读第i行第2列Edit3.Text := listview1.Items[i].SubItems.strings[1];  //读第i行第3列以次类推,可以用循环读出整列。  →将焦点上移一行:For i:=0 to ListView1.Items.Count-1 Do  If (ListView1.Items[i].Selected) and (i>0) then    begin      ListView1.SetFocus;      ListView1.Items.Item[i-1].Selected := True;    end;不过在Delphi6中,ListView多了一个ItemIndex属性,所以只要ListView1.SetFocus;ListView1.ItemIndex:=3;就能设定焦点了。 Delphi的listview能实现交替颜色么?procedure TForm1.ListView1CustomDrawItem(  Sender: TCustomListView; Item: TListItem; State: TCustomDrawState;  var DefaultDraw: Boolean);var  i: integer;begin  i:= (Sender as TListView).Items.IndexOf(Item);  if odd(i) then sender.Canvas.Brush.Color:= $02E0F0D7  else sender.Canvas.Brush.Color:= $02F0EED7;  Sender.Canvas.FillRect(Item.DisplayRect(drIcon));end;    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    ListView 导出到excel文件

    uses   ComObj;     procedure   Tzong_Form.BitBtn2Click(Sender:   TObject);     var         myexcel:variant;         workbook:olevariant;         worksheet:olevariant;         k:integer;     begin             try               myexcel:=createoleobject('excel.application');           myexcel.application.workbooks.add;           myexcel.caption:='将数据导入到EXCEL表中';           myexcel.application.visible:=true;           workbook:=myexcel.application.workbooks[1];           worksheet:=workbook.worksheets.item[1];           except             showmessage('EXCEL不存在!');           end;           worksheet.cells[1,1]:='年月';           worksheet.cells[1,2]:='余额';           worksheet.cells[1,3]:='收入';           worksheet.cells[1,4]:='支出';         for   k:=0   to   listview1.items.count-1   do             begin                 worksheet.cells[k+2,1]:=Listview1.items[k].caption;//把第一列的数据放入Excel的第一列         //其他列的同理                 worksheet.cells[k+2,2]:=Listview1.items[k].SubItems[0];                 worksheet.cells[k+2,3]:=Listview1.items[k].SubItems[1];                 worksheet.cells[k+2,4]:=Listview1.items[k].SubItems[2];               end;     end; name="google_ads_frame" marginwidth="0" marginheight="0" src="http://pagead2.googlesyndication.com/pagead/ads?client=ca-pub-3528650120430763&dt=1183890684015&lmt=1183890684&format=468x60_as&output=html&correlator=1183890684000&url=http://gmai9999.googlepages.com/home&ad_type=text_image&ui=rc:0&cc=100&flash=9&u_h=768&u_w=1024&u_ah=738&u_aw=1024&u_cd=32&u_tz=480&u_java=true" frameborder="0" width="468" scrolling="no" height="60" allowtransparency="allowtransparency">


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