试试这个输入数字的Edit控件unit OopsNumberEdit;{$D-}interfaceuses Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs, StdCtrls;type TOopsNumberType = (ntInteger, ntDouble, ntMoney); TOopsNumberEdit = class(TCustomEdit) private FCanvas: TControlCanvas; FFocused: Boolean; FValue: Extended; FisNull: Boolean; FNumberType: TOopsNumberType; FValidChars: set of Char; function GetTextMargins: TPoint; procedure SetNumberType(Value: TOopsNumberType); procedure CMEnter(var Message: TCMEnter); message CM_ENTER; procedure CMExit(var Message: TCMExit); message CM_EXIT; procedure WMPaint(var Message: TWMPaint); message WM_PAINT; protected procedure Change; override; procedure KeyPress(var Key: Char); override; public constructor Create(AOwner: TComponent); override; procedure Clear; override; property IsNull: Boolean read FIsNull; property Value: Extended read FValue; published property Anchors; property AutoSelect; property AutoSize; property BiDiMode; property BorderStyle; property Color; property Constraints; property Ctl3D; property Enabled; property Font; property MaxLength; property NumberType: TOopsNumberType read FNumberType write SetNumberType; property ParentBiDiMode; property ParentColor; property ParentCtl3D; property ParentFont; property ParentShowHint; property PopupMenu; property ReadOnly; property ShowHint; property TabOrder; property TabStop; property Text; property Visible; property OnChange; property OnClick; property OnDblClick; property OnEnter; property OnExit; property OnKeyDown; property OnKeyPress; property OnKeyUp; property OnMouseDown; property OnMouseMove; property OnMouseUp; end;procedure Register;implementationconst TOopsNumberFmt: array[TOopsNumberType]of string = ('#,##0','#,##0.##########','#,##0.00');constructor TOopsNumberEdit.Create(AOwner: TComponent); begin inherited Create(AOwner); ControlStyle := ControlStyle + [csReplicatable]; Text:=''; end;procedure TOopsNumberEdit.Change; var c: Extended; begin if Trim(Text)='' then begin FisNull:=True; FValue:=0; end else if TextToFloat(PChar(Text), FValue, fvExtended) then begin FisNull:=False; c:=FValue; case FNumberType of ntInteger: c:=Round(FValue); ntMoney: c:=Round(FValue)+Round(Frac(FValue)*100)/100; end; if c<>FValue then Text:=FloatToStr(c); end else begin Text:=FloatToStr(FValue); end; inherited; Invalidate; end;procedure TOopsNumberEdit.KeyPress(var Key: Char); begin inherited KeyPress(Key); if (Key in [#32..#255]) and not(Key in FValidChars) then begin MessageBeep(0); Key := #0; end; end;procedure TOopsNumberEdit.SetNumberType(Value: TOopsNumberType); begin if FNumberType<>Value then FNumberType:=Value; Change; if FNumberType=ntInteger then FValidChars := ['-', '0'..'9'] else FValidChars := [DecimalSeparator, '-', '0'..'9']; end;procedure TOopsNumberEdit.Clear; begin FisNull:=True; FValue:=0; inherited; end;procedure TOopsNumberEdit.CMEnter(var Message: TCMEnter); begin FFocused:=True; inherited; end;procedure TOopsNumberEdit.CMExit(var Message: TCMExit); begin FFocused:=False; if FisNull then Text:='' else Text:=FloatToStr(FValue); inherited; Invalidate; end;procedure TOopsNumberEdit.WMPaint(var Message: TWMPaint); const AlignStyle : array[Boolean, TAlignment] of DWORD = ((WS_EX_LEFT, WS_EX_RIGHT, WS_EX_LEFT), (WS_EX_RIGHT, WS_EX_LEFT, WS_EX_LEFT)); var Left: Integer; Margins: TPoint; R: TRect; DC: HDC; PS: TPaintStruct; S: string; AAlignment: TAlignment; ExStyle: DWORD; begin if FFocused then AAlignment := taLeftJustify else AAlignment := taRightJustify; if UseRightToLeftAlignment then ChangeBiDiModeAlignment(AAlignment); if ((AAlignment = taLeftJustify) or FFocused) and not (csPaintCopy in ControlState) then begin if SysLocale.MiddleEast and HandleAllocated and (IsRightToLeft) then begin { This keeps the right aligned text, right aligned } ExStyle := DWORD(GetWindowLong(Handle, GWL_EXSTYLE)) and (not WS_EX_RIGHT) and (not WS_EX_RTLREADING) and (not WS_EX_LEFTSCROLLBAR); if UseRightToLeftReading then ExStyle := ExStyle or WS_EX_RTLREADING; if UseRightToLeftScrollbar then ExStyle := ExStyle or WS_EX_LEFTSCROLLBAR; ExStyle := ExStyle or AlignStyle[UseRightToLeftAlignment, AAlignment]; if DWORD(GetWindowLong(Handle, GWL_EXSTYLE)) <> ExStyle then SetWindowLong(Handle, GWL_EXSTYLE, ExStyle); end; inherited; Exit; end; if FCanvas = nil then begin FCanvas := TControlCanvas.Create; FCanvas.Control := Self; end; DC := Message.DC; if DC = 0 then DC := BeginPaint(Handle, PS); FCanvas.Handle := DC; try FCanvas.Font := Font; with FCanvas do begin R := ClientRect; if not (NewStyleControls and Ctl3D) and (BorderStyle = bsSingle) then begin Brush.Color := clWindowFrame; FrameRect(R); InflateRect(R, -1, -1); end; Brush.Color := Color; if not Enabled then Font.Color := clGrayText; if FisNull then S:='' else begin S := FormatFloat(TOopsNumberFmt[FNumberType],FValue); if FNumberType=ntMoney then S:=CurrencyString+S; end; Margins := GetTextMargins; case AAlignment of taLeftJustify: Left := Margins.X; taRightJustify: Left := ClientWidth - TextWidth(S) - Margins.X - 1; else Left := (ClientWidth - TextWidth(S)) div 2; end; if SysLocale.MiddleEast then UpdateTextFlags; TextRect(R, Left, Margins.Y, S); end; finally FCanvas.Handle := 0; if Message.DC = 0 then EndPaint(Handle, PS); end; end;function TOopsNumberEdit.GetTextMargins: TPoint; var DC: HDC; SaveFont: HFont; I: Integer; SysMetrics, Metrics: TTextMetric; begin if NewStyleControls then begin if BorderStyle = bsNone then I := 0 else if Ctl3D then I := 1 else I := 2; Result.X := SendMessage(Handle, EM_GETMARGINS, 0, 0) and $0000FFFF + I; Result.Y := I; end else begin if BorderStyle = bsNone then I := 0 else begin DC := GetDC(0); GetTextMetrics(DC, SysMetrics); SaveFont := SelectObject(DC, Font.Handle); GetTextMetrics(DC, Metrics); SelectObject(DC, SaveFont); ReleaseDC(0, DC); I := SysMetrics.tmHeight; if I > Metrics.tmHeight then I := Metrics.tmHeight; I := I div 4; end; Result.X := I; Result.Y := I; end; end;procedure Register; begin RegisterComponents('OopsWare', [TOopsNumberEdit]); end;end.
if not (key in ['0'..'9', #8]) then//这里的#8指的是退格键
key := #0;
别忘了揭帖!
判断输入的是否0-9!可以这样写!try
StrToInt(Edit1.text);
except
ShowMessage('Edit输入的非数字');
try
StrToDate(Edit1.text);
except
ShowMessage('Edit输入的非日期型');
Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
StdCtrls;type
TOopsNumberType = (ntInteger, ntDouble, ntMoney); TOopsNumberEdit = class(TCustomEdit)
private
FCanvas: TControlCanvas;
FFocused: Boolean;
FValue: Extended;
FisNull: Boolean;
FNumberType: TOopsNumberType;
FValidChars: set of Char;
function GetTextMargins: TPoint;
procedure SetNumberType(Value: TOopsNumberType);
procedure CMEnter(var Message: TCMEnter); message CM_ENTER;
procedure CMExit(var Message: TCMExit); message CM_EXIT;
procedure WMPaint(var Message: TWMPaint); message WM_PAINT;
protected
procedure Change; override;
procedure KeyPress(var Key: Char); override;
public
constructor Create(AOwner: TComponent); override;
procedure Clear; override;
property IsNull: Boolean read FIsNull;
property Value: Extended read FValue;
published
property Anchors;
property AutoSelect;
property AutoSize;
property BiDiMode;
property BorderStyle;
property Color;
property Constraints;
property Ctl3D;
property Enabled;
property Font;
property MaxLength;
property NumberType: TOopsNumberType read FNumberType write SetNumberType;
property ParentBiDiMode;
property ParentColor;
property ParentCtl3D;
property ParentFont;
property ParentShowHint;
property PopupMenu;
property ReadOnly;
property ShowHint;
property TabOrder;
property TabStop;
property Text;
property Visible;
property OnChange;
property OnClick;
property OnDblClick;
property OnEnter;
property OnExit;
property OnKeyDown;
property OnKeyPress;
property OnKeyUp;
property OnMouseDown;
property OnMouseMove;
property OnMouseUp;
end;procedure Register;implementationconst
TOopsNumberFmt: array[TOopsNumberType]of string =
('#,##0','#,##0.##########','#,##0.00');constructor TOopsNumberEdit.Create(AOwner: TComponent);
begin
inherited Create(AOwner);
ControlStyle := ControlStyle + [csReplicatable];
Text:='';
end;procedure TOopsNumberEdit.Change;
var c: Extended;
begin
if Trim(Text)='' then begin
FisNull:=True;
FValue:=0; end
else
if TextToFloat(PChar(Text), FValue, fvExtended)
then begin
FisNull:=False;
c:=FValue;
case FNumberType of
ntInteger: c:=Round(FValue);
ntMoney: c:=Round(FValue)+Round(Frac(FValue)*100)/100;
end;
if c<>FValue then Text:=FloatToStr(c);
end else begin
Text:=FloatToStr(FValue);
end;
inherited;
Invalidate;
end;procedure TOopsNumberEdit.KeyPress(var Key: Char);
begin
inherited KeyPress(Key);
if (Key in [#32..#255]) and not(Key in FValidChars) then
begin
MessageBeep(0);
Key := #0;
end;
end;procedure TOopsNumberEdit.SetNumberType(Value: TOopsNumberType);
begin
if FNumberType<>Value then FNumberType:=Value;
Change;
if FNumberType=ntInteger
then FValidChars := ['-', '0'..'9']
else FValidChars := [DecimalSeparator, '-', '0'..'9'];
end;procedure TOopsNumberEdit.Clear;
begin
FisNull:=True;
FValue:=0;
inherited;
end;procedure TOopsNumberEdit.CMEnter(var Message: TCMEnter);
begin
FFocused:=True;
inherited;
end;procedure TOopsNumberEdit.CMExit(var Message: TCMExit);
begin
FFocused:=False;
if FisNull then Text:=''
else Text:=FloatToStr(FValue);
inherited;
Invalidate;
end;procedure TOopsNumberEdit.WMPaint(var Message: TWMPaint);
const
AlignStyle : array[Boolean, TAlignment] of DWORD =
((WS_EX_LEFT, WS_EX_RIGHT, WS_EX_LEFT),
(WS_EX_RIGHT, WS_EX_LEFT, WS_EX_LEFT));
var
Left: Integer;
Margins: TPoint;
R: TRect;
DC: HDC;
PS: TPaintStruct;
S: string;
AAlignment: TAlignment;
ExStyle: DWORD;
begin
if FFocused then AAlignment := taLeftJustify
else AAlignment := taRightJustify;
if UseRightToLeftAlignment then ChangeBiDiModeAlignment(AAlignment);
if ((AAlignment = taLeftJustify) or FFocused) and
not (csPaintCopy in ControlState) then
begin
if SysLocale.MiddleEast and HandleAllocated and (IsRightToLeft) then
begin { This keeps the right aligned text, right aligned }
ExStyle := DWORD(GetWindowLong(Handle, GWL_EXSTYLE)) and (not WS_EX_RIGHT) and
(not WS_EX_RTLREADING) and (not WS_EX_LEFTSCROLLBAR);
if UseRightToLeftReading then ExStyle := ExStyle or WS_EX_RTLREADING;
if UseRightToLeftScrollbar then ExStyle := ExStyle or WS_EX_LEFTSCROLLBAR;
ExStyle := ExStyle or
AlignStyle[UseRightToLeftAlignment, AAlignment];
if DWORD(GetWindowLong(Handle, GWL_EXSTYLE)) <> ExStyle then
SetWindowLong(Handle, GWL_EXSTYLE, ExStyle);
end;
inherited;
Exit;
end;
if FCanvas = nil then
begin
FCanvas := TControlCanvas.Create;
FCanvas.Control := Self;
end;
DC := Message.DC;
if DC = 0 then DC := BeginPaint(Handle, PS);
FCanvas.Handle := DC;
try
FCanvas.Font := Font;
with FCanvas do
begin
R := ClientRect;
if not (NewStyleControls and Ctl3D) and (BorderStyle = bsSingle) then
begin
Brush.Color := clWindowFrame;
FrameRect(R);
InflateRect(R, -1, -1);
end;
Brush.Color := Color;
if not Enabled then
Font.Color := clGrayText;
if FisNull then S:='' else begin
S := FormatFloat(TOopsNumberFmt[FNumberType],FValue);
if FNumberType=ntMoney then S:=CurrencyString+S; end;
Margins := GetTextMargins;
case AAlignment of
taLeftJustify: Left := Margins.X;
taRightJustify: Left := ClientWidth - TextWidth(S) - Margins.X - 1;
else
Left := (ClientWidth - TextWidth(S)) div 2;
end;
if SysLocale.MiddleEast then UpdateTextFlags;
TextRect(R, Left, Margins.Y, S);
end;
finally
FCanvas.Handle := 0;
if Message.DC = 0 then EndPaint(Handle, PS);
end;
end;function TOopsNumberEdit.GetTextMargins: TPoint;
var
DC: HDC;
SaveFont: HFont;
I: Integer;
SysMetrics, Metrics: TTextMetric;
begin
if NewStyleControls then
begin
if BorderStyle = bsNone then I := 0 else
if Ctl3D then I := 1 else I := 2;
Result.X := SendMessage(Handle, EM_GETMARGINS, 0, 0) and $0000FFFF + I;
Result.Y := I;
end else
begin
if BorderStyle = bsNone then I := 0 else
begin
DC := GetDC(0);
GetTextMetrics(DC, SysMetrics);
SaveFont := SelectObject(DC, Font.Handle);
GetTextMetrics(DC, Metrics);
SelectObject(DC, SaveFont);
ReleaseDC(0, DC);
I := SysMetrics.tmHeight;
if I > Metrics.tmHeight then I := Metrics.tmHeight;
I := I div 4;
end;
Result.X := I;
Result.Y := I;
end;
end;procedure Register;
begin
RegisterComponents('OopsWare', [TOopsNumberEdit]);
end;end.