我的窗体里有一个dbcombobox和Dbgrid,按很多朋友的说法我已经实现了dbcombobox和Dbgrid的某个字段的关联,,但是Dbcombobox怎么没嵌进我指定的单元格里面,而是悬浮在外面呀?
还有哪些东西要设置呀?4、 DrawDataCell事件是绘制单元格,当获得焦点网格所对应的字段与组合框所对应的字段一致时,移动组合框到获得焦点的网格上,并且
使组合框可视,从而达到在DBGrid指定列上显示DBComboBox的功能。设置DBGrid1的OnDrawDataCell事件如下:
procedure TForm1.DBGrid1DrawDataCell(Sender: TObject; const Rect: TRect; Field: TField; State: TGridDrawState);
begin
if (gdFocused in State) then
begin
if (Field.FieldName = DBComboBox1.DataField ) then
begin
DBComboBox1.Left := Rect.Left + DBGrid1.Left;
DBComboBox1.Top := Rect.Top + DBGrid1.top;
DBComboBox1.Width := Rect.Right - Rect.Left;
DBComboBox1.Height := Rect.Bottom - Rect.Top;
DBComboBox1.Visible := True;
end;
end;
end; ---- 5、 DBGrid指定单元格未获得焦点时不显示DBComboBox,设置DBGrid1的OnColExit事件如下:
procedure TForm1.DBGrid1ColExit(Sender: TObject);
begin
If DBGrid1.SelectedField.FieldName = DBComboBox1.DataField then
begin
DBComboBox1.Visible := false;
end;
end; ---- 6、 当DBGrid指定列获得焦点时DrawDataCell事件只是绘制单元格,并显示DBComboBox,但是DBComboBox并没有获得焦点,数据的输入还是在单元格上进行。在DBGrid1的KeyPress事件中调用SendMessage这个 Windows API函数将数据输入传输到DBComboBox上,从而达到在DBComboBox上进行数据输入。因此还要设置KeyPress事件如下:
procedure TForm1.DBGrid1KeyPress(Sender: TObject; var Key: Char);
begin
if (key < > chr(9)) then
begin
if (DBGrid1.SelectedField.FieldName =DBComboBox1.DataField) then
begin
DBComboBox1.SetFocus;
SendMessage(DBComboBox1.Handle, WM_Char, word(Key), 0);
end;
end;
end;
还有哪些东西要设置呀?4、 DrawDataCell事件是绘制单元格,当获得焦点网格所对应的字段与组合框所对应的字段一致时,移动组合框到获得焦点的网格上,并且
使组合框可视,从而达到在DBGrid指定列上显示DBComboBox的功能。设置DBGrid1的OnDrawDataCell事件如下:
procedure TForm1.DBGrid1DrawDataCell(Sender: TObject; const Rect: TRect; Field: TField; State: TGridDrawState);
begin
if (gdFocused in State) then
begin
if (Field.FieldName = DBComboBox1.DataField ) then
begin
DBComboBox1.Left := Rect.Left + DBGrid1.Left;
DBComboBox1.Top := Rect.Top + DBGrid1.top;
DBComboBox1.Width := Rect.Right - Rect.Left;
DBComboBox1.Height := Rect.Bottom - Rect.Top;
DBComboBox1.Visible := True;
end;
end;
end; ---- 5、 DBGrid指定单元格未获得焦点时不显示DBComboBox,设置DBGrid1的OnColExit事件如下:
procedure TForm1.DBGrid1ColExit(Sender: TObject);
begin
If DBGrid1.SelectedField.FieldName = DBComboBox1.DataField then
begin
DBComboBox1.Visible := false;
end;
end; ---- 6、 当DBGrid指定列获得焦点时DrawDataCell事件只是绘制单元格,并显示DBComboBox,但是DBComboBox并没有获得焦点,数据的输入还是在单元格上进行。在DBGrid1的KeyPress事件中调用SendMessage这个 Windows API函数将数据输入传输到DBComboBox上,从而达到在DBComboBox上进行数据输入。因此还要设置KeyPress事件如下:
procedure TForm1.DBGrid1KeyPress(Sender: TObject; var Key: Char);
begin
if (key < > chr(9)) then
begin
if (DBGrid1.SelectedField.FieldName =DBComboBox1.DataField) then
begin
DBComboBox1.SetFocus;
SendMessage(DBComboBox1.Handle, WM_Char, word(Key), 0);
end;
end;
end;
解决方案 »
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