我发现Delphi下没有很好用的只能输入数字的控件。所以自己写了一个（D7）。
菜鸟一个，希望大家多多指点。呵呵。。。
unit ComerMaskEdit;
interface
uses
Windows, Messages, Graphics, Forms,
SysUtils, Classes, Controls, StdCtrls;
type
TComerMaskEdit = class(TEdit)
private
FMdNumber: string;
FIpo : Integer;
FLen : Integer;
procedure SetMdNumber(const Value: string);
procedure WMPaste(var Message: TMessage); message WM_PASTE;
{ Private declarations }
protected
procedure CreateWnd;override;
{ Protected declarations }
public
constructor Create(AOwner:TComponent);override;
procedure DoEnter(); override;
procedure DoExit(); override;
procedure KeyPress(var Key: Char); override;
procedure KeyDown (var Key: Word; Shift: TShiftState);override;
{ Public declarations }
published
property MdNumber:string read FMdNumber write SetMdNumber;
{ Published declarations }
end;
procedure Register;
implementation
procedure Register;
begin
RegisterComponents('Standard', [TComerMaskEdit]);
end;
{TComerMaskEdit}
constructor TComerMaskEdit.Create(AOwner: TComponent);
begin
inherited Create(AOwner);
Font.Size :=12;
Font.Name:='宋体';
Font.Charset:=GB2312_CHARSET;
FMdNumber := '';
end;
procedure TComerMaskEdit.CreateWnd;
var
I, k : Integer;
S, Str : string;
begin
inherited;
if not Enabled then
Font.Color := clNavy;
Font.Size :=12;
Font.Name :='宋体';
Font.Charset :=GB2312_CHARSET;
if FMdNumber <> '' then
begin
I := Pos(',',FMdNumber);
if I > 0 then
begin
S := Copy(FMdNumber,1,I-1);
FIpo := StrToInt(Copy(FMdNumber,I+1,Length(FMdNumber)-I));
for k:=1 to FIpo do
Str := Str + '0';
Text := '.' + Str;
end
else
begin
S := FMdNumber;
FIpo := 0;
Text := '';
end;
MaxLength := StrToInt(S);
FLen := MaxLength;
imeMode := imClose;
end;
end;
procedure TComerMaskEdit.SetMdNumber(const Value: string);
var
S : string;
begin
if Value <> '' then
begin
S := StringReplace(Value,',','',[rfIgnoreCase]);
try
StrToInt(S);
except
Application.MessageBox('属性值设置不对！','错误',MB_OK+MB_ICONError);
FMdNumber := '';
Exit;
end;
end;
FMdNumber := Value;
end;
procedure TComerMaskEdit.DoEnter();
begin
inherited;
SelStart := 0;
end;
procedure TComerMaskEdit.DoExit();
begin
if (FIpo>0) and (Pos('.',Text)=0) then
Text := Text + '.' + StringOfChar('0',FIpo)
else
inherited;
end;
procedure TComerMaskEdit.KeyPress(var Key: Char);
var
I, k : Integer;
AfterDot, BeforSelStart : string;
//, AfterSelStart,
Str : string;
TmpText : string;
iSelStart: Integer;
//BeforComma, AfterComma : String;
begin
//如果有多个字符被选中
if SelLength > 0 then
SelStart := 0
else
begin
if FMdNumber <> '' then
begin
if (Length(Text)=0) and (FIpo>0) then
begin
for k:=1 to FIpo do
Str := Str + '0';
Text := '.' + Str;
end;
case Key of
#13:
inherited;
'-':
begin
if (SelStart<>0) or (Pos('-',Text)>0) then
Key := #0
else
//MaxLength := MaxLength + 1;
inherited;
end;
#8:
begin
I := Pos('.',Text);
if (I > 0) and (SelStart>I) then
begin
key := #0;
iSelStart := SelStart;
TmpText := Text;
BeforSelStart := Copy(TmpText,1,iSelStart-1);
Text := BeforSelStart + Copy(TmpText,iSelStart+1,Length(TmpText)-iSelStart) + '0';
SelStart := iSelStart - 1;
end
else if (I > 0) and (SelStart=I) then
begin
key := #0;
iSelStart := SelStart;
SelStart := iSelStart - 1;
end
else
inherited;
end;
'0'..'9':
begin
I := Pos('.',Text);
//限制位数
if I > 0 then
begin
if SelStart = Length(Text) then
key := #0
else
begin
AfterDot := Copy(Text,I+1,Length(Text)-FIpo);
if Length(AfterDot) > FIpo then
key := #0
else if SelStart >= I then
begin
iSelStart := SelStart;
TmpText := Text;
BeforSelStart := Copy(TmpText,1,iSelStart);
Text := BeforSelStart + Copy(TmpText,iSelStart+2,Length(TmpText)-iSelStart-1);
SelStart := iSelStart;
end
else
inherited;
end;
end
else if (I<=0) and (FIpo>0) then //这种情况基本不存在
begin
if Length(Text) >= FLen-FIpo-1 then
key := #0
else
inherited;
end
else //FIpo=0
inherited;
end;
'.':
begin
Key := #0;
if FIpo>0 then
SelStart := Pos('.',Text);
end;
else
Key := #0;
end;
end
else
//Key := #0;
inherited;
end;
end;
procedure TComerMaskEdit.KeyDown(var Key: Word; Shift: TShiftState);
var
I : Integer;
BeforSelStart : string;
TmpText : string;
iSelStart: Integer;
begin
//如果有多个字符被选中
if SelLength > 0 then
begin
Key := 0;
SelStart := 0;
end
else
begin
if FMdNumber <> '' then
begin
if Key=VK_DELETE then
begin
I := Pos('.',Text);
if (I > 0) and (SelStart>=I) then
begin
key := 0;
iSelStart := SelStart;
TmpText := Text;
BeforSelStart := Copy(TmpText,1,iSelStart);
if (SelStart=Length(Text)) then
Text := BeforSelStart + Copy(TmpText,iSelStart+2,Length(TmpText)-iSelStart-1)
else
Text := BeforSelStart + Copy(TmpText,iSelStart+2,Length(TmpText)-iSelStart-1) + '0';
SelStart := iSelStart;
end
else if (I > 0) and (SelStart=I-1) then
begin
key := 0;
iSelStart := SelStart;
SelStart := iSelStart + 1;
end;
end
else if (Key=VK_TAB) or (Key=VK_LEFT) or (Key=VK_UP) or (Key=VK_RIGHT) or (Key=VK_DOWN) or (Key=VK_END) or (Key=VK_HOME) then
inherited
else
Key := 0;
end
else
inherited;
end;
end;
procedure TComerMaskEdit.WMPaste(var Message: TMessage);
begin
if FMdNumber='' then
inherited;
end;
end.
