DBGrid相關技術整理
DBGrid相關技術整理；
注：對於DBGrid相關屬性、方法的學習融入到技術整理過程中
一，多選
設定屬性：
Options->dgMultiSelect = True;
->dgRowSelect = True;
應用屬性：
SelectedRows;
操作方法：
-Ctrl + Mouse Clicks
-Shift + Arrow Keys
For example：
1,取得所選行某個欄位的值的合計:
procedure TForm1.btnDoSumClick(Sender: TObject);
var
i: Integer;
sum: Single;
begin
if DBGrid1.SelectedRows.Count > 0 then
begin
sum := 0;
with DBGrid1.DataSource.DataSet do
begin
for i := 0 to DBGrid1.SelectedRows.Count - 1 do
begin
GotoBookmard(Pointer(DBGrid1.SelectedRows.Items[i]));
sum := sum + AdoQuery1.FieldByName('Size').asfloat;
end;
end;
edtSizeSum.Text := FloattoStr(sum);
end;
end;
//用edtSizeSum來接收計算來的合計值
2,全選DBGrid:
procedure DBGridSelectAll(AGrid: TDBGrid) ;
begin
AGrid.SelectedRows.Clear;
with AGrid.DataSource.DataSet do
begin
DisableControls;
First;
try
while not EOF do
begin
AGrid.SelectedRows.CurrentRowSelected := True;
Next;
end;
finally
EnableControls;
end;
end;
end;
深入瞭解:
1,SelectedRows:
The TDBGrid component keeps all the selections as Bookmarks in a TStringList,
and all the Bookmarks must be converted to a Pointer (what they really are) before using it.
&
The SelectedRows property is an object of type TBookmarkList.
We can use the SelectedRows property to, for example:
--get the number of rows selected,
--clear the selection(unselect),
--delete all the selected records,
--check whether a particular record is selected.
2,執行時設定DBGrid的多選屬性
DBGrid1.Options := DBGrid1.Options + [dgMultiSelect];
//以上部分內容取自http://delphi.about.com/od/usedbvcl/l/aa032503a.htm
二,加入其它控制元件
http://delphi.about.com/od/usedbvcl/l/aa082003a.htm
http://delphi.about.com/od/usedbvcl/l/aa082003a.htm
三,顏色設定
http://delphi.about.com/od/usedbvcl/l/aa031699.htm