in [vk_delete,vk_back,vk_up,vk_down] ) then exit; if (dts<>nil ) and (not dts.DataSet.Active ) then exit; if (dts<>nil) and (not dts.DataSet.Modified ) then dts.DataSet.Edit; ////////////////////////////////////// TextSave:=ctl.Text; SelStartSave:=ctl.SelStart; SelLengthSave:=ctl.SelLength; case SelStartSave of 0,1: EditingPos:=1; 3,4: EditingPos:=2; 6,7: EditingPos:=3; else EditingPos:=0; end; if SelStartSave=length(TextSave) then EditingPos:=TimeFormat; if Key=vk_delete then begin if SelLengthSave=length(TextSave) then TextSave:='''''''' else begin if not (SelStartSave in [2,5]) then TextSave[SelStartSave+1]:=''''0''''; if SelLengthSave>1 then begin for i:=SelStartSave+2 to SelStartSave+SelLengthSave do if i in [1,2,4,5,7,8] then TextSave[i]:=''''0''''; SelLengthSave:=1; end; end; Key:=0; end; if Key=vk_back then begin if SelLengthSave=length(TextSave) then TextSave:='''''''' else if SelLengthSave<=1 then begin if not (SelStartSave in [3,6]) then begin TextSave[SelStartSave]:=''''0''''; SelStartSave:=SelStartSave-1; end else begin TextSave[SelStartSave-1]:=''''0''''; SelStartSave:=SelStartSave-2; end; SelLengthSave:=1; end else begin for i:=SelStartSave+1 to SelStartSave+SelLengthSave do if i in [1,2,4,5,7,8] then TextSave[i]:=''''0''''; SelLengthSave:=1; end; Key:=0; end; /////////////////////////////////////// if (Key=vk_up) or (Key=vk_down ) then begin if trim(TextSave)='''':'''' then begin if TimeFormat=2 then TextSave:=''''00:00'''' else TextSave:=''''00:00:00'''' end else begin if Key=vk_up then case EditingPos of 1: TextSave:=TimeAdd(TextSave,TimeFormat,1,0,0); 2: TextSave:=TimeAdd(TextSave,TimeFormat,0,1,0); 3: TextSave:=TimeAdd(TextSave,TimeFormat,0,0,1); end; if Key=vk_down then case EditingPos of 1: TextSave:=TimeAdd(TextSave,TimeFormat,-1,0,0); 2: TextSave:=TimeAdd(TextSave,TimeFormat,0,-1,0); 3: TextSave:=TimeAdd(TextSave,TimeFormat,0,0,-1); end; end; end; /////////////////////////////////////// ctl.Text :=TextSave; ctl.SelStart :=SelStartSave; ctl.SelLength :=SelLengthSave; end; 以上函数的TimeFormat参数代表时间的类型:1-时:分;2-时:分:秒 要完成对时间的输入限制,只需调用上面的MxFormatTimeKeyPress, MxFormatTimeKeyDown两个函数。 调用示例: (1)TMaskEdit procedure TForm1.MaskEdit1KeyDown(Sender: TObject; var Key: Word; Shift: TShiftState); begin MxFormatTimeKeyDown(Sender as TCustomMaskEdit,2,Key,Shift,nil); end;
procedure TForm1.MaskEdit1KeyPress(Sender: TObject; var Key: Char); begin MxFormatTimeKeyPress(Sender as TCustomMaskEdit,2,Key,nil); end; 并且,TMaskEdit的EditMask属性设为''''99:99'''' (2)TDBEdit
procedure TForm1.DBEdit1KeyPress(Sender: TObject; var Key: Char); begin MxFormatTimeKeyPress(Sender as TCustomMaskEdit,2,Key,(Sender as TDBEdit).DataSource); end;
procedure TForm1.DBEdit1KeyDown(Sender: TObject; var Key: Word; Shift: TShiftState); begin MxFormatTimeKeyDown(Sender as TCustomMaskEdit,2,Key,Shift,(Sender as TDBEdit).DataSource); end; 在TDBEdit所连接的数据源打开后,设定所连字段的EditMask属性为99:99: DBEdit1.Field.EditMask :=''''99:99'''';
(三)日期的输入 采用Rx的日期组件TDateEdit、TDBDateEdit。如果你还没安装,请在本站下载。 无需对日期的输入作限制,只需方便用户的输入。即:箭头键可以改变相应的 日期元素,因为Rx五次功能。函数如下: procedure MxSpinRxDateEdit(Edit:TCustomDateEdit;Key:word;Shift:TShiftState; dts:TDataSource); var DateStr,Mark,str:string; MarkPos1,MarkPos2:integer; DateOrd:TDateOrder; DateFlag,step:integer; OldSelStart:integer; begin if Shift<>[] then exit; if not (Key in [vk_up,vk_down] ) then exit; if (dts<>nil ) and (not dts.DataSet.Active ) then exit; if (dts<>nil ) and (not dts.DataSet.Modified) then dts.DataSet.Edit; OldSelStart:=Edit.SelStart; DateStr:=Edit.EditText; Mark:=GetDateMark(DateStr); MarkPos1:=pos(Mark,DateStr); str:=copy(DateStr,MarkPos1+1,length(DateStr)-MarkPos1); MarkPos2:=MarkPos1+pos(Mark,str); DateOrd:=GetDateOrder(ShortDateFormat); DateFlag:=GetDateFlag(MarkPos1,MarkPos2,Edit.SelStart,DateOrd); if Key=vk_up then step:=1 else if Key=vk_down then step:=-1 else step:=0; case DateFlag of 1: Edit.Date := IncYear(Edit.Date ,step); 2: Edit.Date := IncMonth(Edit.Date ,step); 3: Edit.Date := IncDay(Edit.Date ,step); end; Edit.SelStart :=OldSelStart; end;
此函数在组件的OnKeyDown事件中调用,对于TDateEdit,DataSoure参数为nil。 记着引用Rx的单元ToolEdit和DateUtil。 调用示例: procedure TForm1.DateEdit1KeyDown(Sender: TObject; var Key: Word; Shift: TShiftState); begin MxSpinRxDateEdit(Sender as TCustomDateEdit,Key,Shift,nil); end;
procedure TForm1.DBDateEdit1KeyDown(Sender: TObject; var Key: Word; Shift: TShiftState); begin MxSpinRxDateEdit(Sender as TCustomDateEdit,Key,Shift,(Sender as TDBDateEdit).DataSource); end;