那些遇到过的问题

Delphi 7 - 强制InputBox仅为整数？

Joh*_*erg 8 delphi delphi-7

使用Delphi 7,无论如何强制输入框只允许从0到100的数字输入？

谢谢!

And*_*and 14

您可以轻松编写自己的"超级对话框"

type
  TMultiInputBox = class
  strict private
    class var
      frm: TForm;
      lbl: TLabel;
      edt: TEdit;
      btnOK,
      btnCancel: TButton;
      shp: TShape;
      FMin, FMax: integer;
      FTitle, FText: string;
    class procedure SetupDialog;
    class procedure ValidateInput(Sender: TObject);
  public
    class function TextInputBox(AOwner: TCustomForm; const ATitle,
      AText: string; var Value: string): boolean;
    class function NumInputBox(AOwner: TCustomForm; const ATitle,
      AText: string; AMin, AMax: integer; var Value: integer): boolean;
  end;

class procedure TMultiInputBox.SetupDialog;
begin
  frm.Caption := FTitle;
  frm.Width := 512;
  frm.Position := poOwnerFormCenter;
  frm.BorderStyle := bsDialog;
  lbl := TLabel.Create(frm);
  lbl.Parent := frm;
  lbl.Left := 8;
  lbl.Top := 8;
  lbl.Width := frm.ClientWidth - 16;
  lbl.Caption := FText;
  edt := TEdit.Create(frm);
  edt.Parent := frm;
  edt.Top := lbl.Top + lbl.Height + 8;
  edt.Left := 8;
  edt.Width := frm.ClientWidth - 16;
  btnOK := TButton.Create(frm);
  btnOK.Parent := frm;
  btnOK.Default := true;
  btnOK.Caption := 'OK';
  btnOK.ModalResult := mrOk;
  btnCancel := TButton.Create(frm);
  btnCancel.Parent := frm;
  btnCancel.Cancel := true;
  btnCancel.Caption := 'Cancel';
  btnCancel.ModalResult := mrCancel;
  btnCancel.Top := edt.Top + edt.Height + 16;
  btnCancel.Left := frm.ClientWidth - btnCancel.Width - 8;
  btnOK.Top := btnCancel.Top;
  btnOK.Left := btnCancel.Left - btnOK.Width - 4;
  frm.ClientHeight := btnOK.Top + btnOK.Height + 8;
  shp := TShape.Create(frm);
  shp.Parent := frm;
  shp.Brush.Color := clWhite;
  shp.Pen.Style := psClear;
  shp.Shape := stRectangle;
  shp.Align := alTop;
  shp.Height := btnOK.Top - 8;
  shp.SendToBack;
end;

class function TMultiInputBox.TextInputBox(AOwner: TCustomForm; const ATitle,
  AText: string; var Value: string): boolean;
begin
  FTitle := ATitle;
  FText := AText;

  frm := TForm.Create(AOwner);
  try
    SetupDialog;
    edt.NumbersOnly := false;
    edt.Text := Value;
    result := frm.ShowModal = mrOK;
    if result then Value := edt.Text;
  finally
    frm.Free;
  end;
end;

class procedure TMultiInputBox.ValidateInput(Sender: TObject);
var
  n: integer;
begin
  btnOK.Enabled := TryStrToInt(edt.Text, n) and InRange(n, FMin, FMax);
end;

class function TMultiInputBox.NumInputBox(AOwner: TCustomForm; const ATitle,
  AText: string; AMin, AMax: integer; var Value: integer): boolean;
begin
  FMin := AMin;
  FMax := AMax;
  FTitle := ATitle;
  FText := AText;

  frm := TForm.Create(AOwner);
  try
    SetupDialog;
    edt.NumbersOnly := true;
    edt.Text := IntToStr(value);
    edt.OnChange := ValidateInput;
    result := frm.ShowModal = mrOK;
    if result then Value := StrToInt(edt.Text);
  finally
    frm.Free;
  end;
end;
Run Code Online (Sandbox Code Playgroud)

此对话框允许文本和整数输入:

v := 55;
if TMultiInputBox.NumInputBox(Self, 'This is the title', 'Enter a number between 1 and 100:', 1, 100, v) then
  ShowMessage(IntToStr(v));
Run Code Online (Sandbox Code Playgroud)

要么

s := 'Test';
if TMultiInputBox.TextInputBox(Self, 'This is the title', 'Enter some text:', s) then
  ShowMessage(s);
Run Code Online (Sandbox Code Playgroud)

整数输入对话框示例http://privat.rejbrand.se/numdlg.png

更新

一位评论者评论说,从Delphi 7开始,类程序(等)尚未引入.如果是这种情况(我真的不记得......),只需删除所有这些语法糖:

var
  frm: TForm;
  lbl: TLabel;
  edt: TEdit;
  btnOK,
  btnCancel: TButton;
  shp: TShape;
  FMin, FMax: integer;
  FTitle, FText: string;

procedure SetupDialog;
begin
  frm.Caption := FTitle;
  frm.Width := 512;
  frm.Position := poOwnerFormCenter;
  frm.BorderStyle := bsDialog;
  lbl := TLabel.Create(frm);
  lbl.Parent := frm;
  lbl.Left := 8;
  lbl.Top := 8;
  lbl.Width := frm.ClientWidth - 16;
  lbl.Caption := FText;
  edt := TEdit.Create(frm);
  edt.Parent := frm;
  edt.Top := lbl.Top + lbl.Height + 8;
  edt.Left := 8;
  edt.Width := frm.ClientWidth - 16;
  btnOK := TButton.Create(frm);
  btnOK.Parent := frm;
  btnOK.Default := true;
  btnOK.Caption := 'OK';
  btnOK.ModalResult := mrOk;
  btnCancel := TButton.Create(frm);
  btnCancel.Parent := frm;
  btnCancel.Cancel := true;
  btnCancel.Caption := 'Cancel';
  btnCancel.ModalResult := mrCancel;
  btnCancel.Top := edt.Top + edt.Height + 16;
  btnCancel.Left := frm.ClientWidth - btnCancel.Width - 8;
  btnOK.Top := btnCancel.Top;
  btnOK.Left := btnCancel.Left - btnOK.Width - 4;
  frm.ClientHeight := btnOK.Top + btnOK.Height + 8;
  shp := TShape.Create(frm);
  shp.Parent := frm;
  shp.Brush.Color := clWhite;
  shp.Pen.Style := psClear;
  shp.Shape := stRectangle;
  shp.Align := alTop;
  shp.Height := btnOK.Top - 8;
  shp.SendToBack;
end;

function TextInputBox(AOwner: TCustomForm; const ATitle,
  AText: string; var Value: string): boolean;
begin
  FTitle := ATitle;
  FText := AText;

  frm := TForm.Create(AOwner);
  try
    SetupDialog;
    edt.NumbersOnly := false;
    edt.Text := Value;
    result := frm.ShowModal = mrOK;
    if result then Value := edt.Text;
  finally
    frm.Free;
  end;
end;

type
  TInputValidator = class
    procedure ValidateInput(Sender: TObject);
  end;

procedure TInputValidator.ValidateInput(Sender: TObject);
var
  n: integer;
begin
  btnOK.Enabled := TryStrToInt(edt.Text, n) and InRange(n, FMin, FMax);
end;

function NumInputBox(AOwner: TCustomForm; const ATitle,
  AText: string; AMin, AMax: integer; var Value: integer): boolean;
var
  iv: TInputValidator;
begin
  FMin := AMin;
  FMax := AMax;
  FTitle := ATitle;
  FText := AText;

  frm := TForm.Create(AOwner);
  try
    SetupDialog;
    edt.Text := IntToStr(value);
    iv := TInputValidator.Create;
    try
      edt.OnChange := iv.ValidateInput;
      result := frm.ShowModal = mrOK;
      if result then Value := StrToInt(edt.Text);
    finally
      iv.Free;
    end;
  finally
    frm.Free;
  end;
end;
Run Code Online (Sandbox Code Playgroud)

更新2

我写了一个新的,更好的对话版本.它现在看起来完全像一个任务对话框(我详细遵循了Microsoft的指导原则),它提供了许多选项来转换(例如,大写或小写)和验证(许多选项)输入.它还在整数输入的情况下添加Up Down控件(不一定是那个的自然数).

字符串输入对话框的屏幕截图http://specials.rejbrand.se/dev/classes/multiinput/multiinputstr.png

整数输入对话框的屏幕截图http://specials.rejbrand.se/dev/classes/multiinput/multiinputnum.png

字符输入对话框的屏幕截图http://specials.rejbrand.se/dev/classes/multiinput/multiinputchr.png

源代码:

unit MultiInput;

interface

uses
  Windows, SysUtils, Types, Controls, Graphics, Forms, StdCtrls, ExtCtrls,
  CommCtrl;

type
  TAllowOnlyOption = (aoCapitalAZ, aoSmallAZ, aoAZ, aoLetters, aoDigits, aoSpace,
    aoPeriod, aoComma, aoSemicolon, aoHyphenMinus, aoPlus, aoUnderscore, aoAsterisk);
  TAllowOnlyOptions = set of TAllowOnlyOption;
  TInputVerifierFunc = reference to function(const S: string): boolean;
  TMultiInputBox = class
  strict private
    class var
      frm: TForm;
      edt: TEdit;
      btnOK,
      btnCancel: TButton;
      FMin, FMax: integer;
      FFloatMin, FFloatMax: real;
      FAllowEmptyString: boolean;
      FAllowOnly: TAllowOnlyOptions;
      FInputVerifierFunc: TInputVerifierFunc;
      spin: HWND;
      FTitle, FText: string;
      lineat: integer;
      R: TRect;
    class procedure Paint(Sender: TObject);
    class procedure FormActivate(Sender: TObject);
    class procedure SetupDialog;
    class procedure ValidateIntInput(Sender: TObject);
    class procedure ValidateRealInput(Sender: TObject);
    class procedure ValidateStrInput(Sender: TObject);
  private
    class procedure ValidateStrInputManual(Sender: TObject);
  public
    class function TextInputBox(AOwner: TCustomForm; const ATitle,
      AText: string; var Value: string; ACharCase: TEditCharCase = ecNormal;
      AAllowEmptyString: boolean = true; AAllowOnly: TAllowOnlyOptions = []): boolean;
    class function CharInputBox(AOwner: TCustomForm; const ATitle,
      AText: string; var Value: char; ACharCase: TEditCharCase = ecNormal;
      AAllowOnly: TAllowOnlyOptions = []): boolean;
    class function TextInputBoxEx(AOwner: TCustomForm; const ATitle,
      AText: string; var Value: string; ACharCase: TEditCharCase = ecNormal;
      AInputVerifierFunc: TInputVerifierFunc = nil): boolean;
    class function NumInputBox(AOwner: TCustomForm; const ATitle,
      AText: string; var Value: integer; AMin: integer = -MaxInt + 1;
      AMax: integer = MaxInt): boolean;
    class function FloatInputBox(AOwner: TCustomForm; const ATitle,
      AText: string; var Value: real; AMin: real; AMax: real): boolean;
  end;

implementation

uses Math, Messages, Character;

class procedure TMultiInputBox.Paint(Sender: TObject);
begin
  with frm.Canvas do
  begin
    Pen.Style := psSolid;
    Pen.Width := 1;
    Pen.Color := $00DFDFDF;
    Brush.Style := bsSolid;
    Brush.Color := clWhite;
    FillRect(Rect(0, 0, frm.ClientWidth, lineat));
    MoveTo(0, lineat);
    LineTo(frm.ClientWidth, lineat);
    DrawText(frm.Canvas.Handle, FText, Length(FText), R,
      DT_NOPREFIX or DT_WORDBREAK);
  end;
end;

class procedure TMultiInputBox.SetupDialog;
begin
  { * = Metrics from                                                           }
  { https://msdn.microsoft.com/en-us/windows/desktop/dn742486                  }
  {            and                                                             }
  { https://msdn.microsoft.com/en-us/windows/desktop/dn742478                  }
  frm.Font.Name := 'Segoe UI';
  frm.Font.Size := 9{*};
  frm.Caption := FTitle;
  frm.Width := 400;
  frm.Position := poOwnerFormCenter;
  frm.BorderStyle := bsDialog;
  frm.OnPaint := Paint;
  frm.OnActivate := FormActivate;

  frm.Canvas.Font.Size := 12; { 'MainInstruction' }
  frm.Canvas.Font.Color := $00993300;
  R := Rect(11{*}, 11{*}, frm.Width - 11{*}, 11{*} + 2);
  DrawText(frm.Canvas.Handle, FText, Length(FText),
    R, DT_CALCRECT or DT_NOPREFIX or DT_WORDBREAK);

  edt := TEdit.Create(frm);
  edt.Parent := frm;
  edt.Top := R.Bottom + 5{*};
  edt.Left := 11{*};
  edt.Width := frm.ClientWidth - 2*11{*};
  lineat := edt.Top + edt.Height + 11{*};
  btnOK := TButton.Create(frm);
  btnOK.Parent := frm;
  btnOK.Height := 23{*};
  btnOK.Default := true;
  btnOK.Caption := 'OK';
  btnOK.ModalResult := mrOk;
  btnCancel := TButton.Create(frm);
  btnCancel.Parent := frm;
  btnCancel.Height := 23{*};
  btnCancel.Cancel := true;
  btnCancel.Caption := 'Cancel';
  btnCancel.ModalResult := mrCancel;
  btnCancel.Top := edt.Top + edt.Height + 11{*} + 1{*} + 11{*};
  btnCancel.Left := frm.ClientWidth - btnCancel.Width - 11{*};
  btnOK.Top := btnCancel.Top;
  btnOK.Left := btnCancel.Left - btnOK.Width - 7{*};
  frm.ClientHeight := btnOK.Top + btnOK.Height + 11{*};
end;

class procedure TMultiInputBox.ValidateStrInputManual(Sender: TObject);
begin
  btnOK.Enabled := (not Assigned(FInputVerifierFunc)) or FInputVerifierFunc(edt.Text);
end;

class function TMultiInputBox.TextInputBoxEx(AOwner: TCustomForm; const ATitle,
  AText: string; var Value: string; ACharCase: TEditCharCase;
  AInputVerifierFunc: TInputVerifierFunc): boolean;
begin
  FTitle := ATitle;
  FText := AText;
  FInputVerifierFunc := AInputVerifierFunc;

  frm := TForm.Create(AOwner);
  try
    SetupDialog;
    edt.Text := Value;
    edt.CharCase := ACharCase;
    edt.OnChange := ValidateStrInputManual;
    ValidateStrInputManual(nil);
    result := frm.ShowModal = mrOK;
    if result then Value := edt.Text;
  finally
    frm.Free;
  end;
end;

class procedure TMultiInputBox.ValidateStrInput(Sender: TObject);

  function IsValidStr: boolean;
  var
    S: string;
    i: integer;
  begin
    S := edt.Text;

    result := (Length(S) > 0) or FAllowEmptyString;
    if not result then Exit;

    if FAllowOnly = [] then Exit;

    if aoLetters in FAllowOnly then
      Include(FAllowOnly, aoAZ);

    if aoAZ in FAllowOnly then
    begin
      Include(FAllowOnly, aoCapitalAZ);
      Include(FAllowOnly, aoSmallAZ);
    end;

    result := true;
    for i := 1 to Length(S) do
      case S[i] of
        'a'..'z':
          if not (aoSmallAZ in FAllowOnly) then
            Exit(false);
        'A'..'Z':
          if not (aoCapitalAZ in FAllowOnly) then
            Exit(false);
        '0'..'9':
          if not (aoDigits in FAllowOnly) then
            Exit(false);
        ' ':
          if not (aoSpace in FAllowOnly) then
            Exit(false);
        '.':
          if not (aoPeriod in FAllowOnly) then
            Exit(false);
        ',':
          if not (aoComma in FAllowOnly) then
            Exit(false);
        ';':
          if not (aoSemicolon in FAllowOnly) then
            Exit(false);
        '-':
          if not (aoHyphenMinus in FAllowOnly) then
            Exit(false);
        '+':
          if not (aoPlus in FAllowOnly) then
            Exit(false);
        '_':
          if not (aoUnderscore in FAllowOnly) then
            Exit(false);
        '*':
          if not (aoAsterisk in FAllowOnly) then
            Exit(false);
      else
        if not (TCharacter.IsLetter(S[i]) and (aoLetters in FAllowOnly)) then
          Exit(false);
      end;

  end;

begin
    btnOK.Enabled := IsValidStr;
end;

class function TMultiInputBox.TextInputBox(AOwner: TCustomForm; const ATitle,
  AText: string; var Value: string; ACharCase: TEditCharCase = ecNormal;
  AAllowEmptyString: boolean = true; AAllowOnly: TAllowOnlyOptions = []): boolean;
begin
  FTitle := ATitle;
  FText := AText;
  FAllowEmptyString := AAllowEmptyString;
  FAllowOnly := AAllowOnly;

  frm := TForm.Create(AOwner);
  try
    SetupDialog;
    edt.Text := Value;
    edt.CharCase := ACharCase;
    edt.OnChange := ValidateStrInput;
    ValidateStrInput(nil);
    result := frm.ShowModal = mrOK;
    if result then Value := edt.Text;
  finally
    frm.Free;
  end;
end;

class procedure TMultiInputBox.ValidateIntInput(Sender: TObject);
var
  n: integer;
begin
  btnOK.Enabled := TryStrToInt(edt.Text, n) and InRange(n, FMin, FMax);
end;

class procedure TMultiInputBox.ValidateRealInput(Sender: TObject);
var
  x: double;
begin
  btnOK.Enabled := TryStrToFloat(edt.Text, x) and InRange(x, FFloatMin, FFloatMax);
end;

class function TMultiInputBox.CharInputBox(AOwner: TCustomForm; const ATitle,
  AText: string; var Value: char; ACharCase: TEditCharCase;
  AAllowOnly: TAllowOnlyOptions): boolean;
begin
  FTitle := ATitle;
  FText := AText;
  FAllowEmptyString := false;
  FAllowOnly := AAllowOnly;

  frm := TForm.Create(AOwner);
  try
    SetupDialog;
    edt.Text := Value;
    edt.CharCase := ACharCase;
    edt.OnChange := ValidateStrInput;
    edt.MaxLength := 1;
    ValidateStrInput(nil);
    result := frm.ShowModal = mrOK;
    if result then Value := edt.Text[1];
  finally
    frm.Free;
  end;
end;

class function TMultiInputBox.FloatInputBox(AOwner: TCustomForm; const ATitle,
  AText: string; var Value: real; AMin, AMax: real): boolean;
begin
  FFloatMin := AMin;
  FFloatMax := AMax;
  FTitle := ATitle;
  FText := AText;

  frm := TForm.Create(AOwner);
  try
    SetupDialog;
    edt.Text := FloatToStr(Value);
    edt.OnChange := ValidateRealInput;
    ValidateRealInput(nil);
    result := frm.ShowModal = mrOK;
    if result then Value := StrToFloat(edt.Text);
  finally
    frm.Free;
  end;
end;

class procedure TMultiInputBox.FormActivate(Sender: TObject);
var
  b: boolean;
begin
  if SystemParametersInfo(SPI_GETSNAPTODEFBUTTON, 0, @b, 0) and b then
    with btnOK do
      with ClientToScreen(Point(Width div 2, Height div 2)) do
        SetCursorPos(x, y);
  frm.OnActivate := nil;
end;

class function TMultiInputBox.NumInputBox(AOwner: TCustomForm; const ATitle,
  AText: string; var Value: integer; AMin: integer = -MaxInt + 1;
  AMax: integer = MaxInt): boolean;
const
  UDM_SETPOS32 = WM_USER + 113;
var
  ICCX: TInitCommonControlsEx;
begin
  FMin := AMin;
  FMax := AMax;
  FTitle := ATitle;
  FText := AText;

  frm := TForm.Create(AOwner);
  try
    SetupDialog;

    ICCX.dwSize := sizeof(ICCX);
    ICCX.dwICC := ICC_UPDOWN_CLASS;
    InitCommonControlsEx(ICCX);
    spin := CreateWindowEx(0, PChar(UPDOWN_CLASS), nil,
      WS_CHILDWINDOW or WS_VISIBLE or UDS_NOTHOUSANDS or UDS_SETBUDDYINT or
      UDS_ALIGNRIGHT or UDS_ARROWKEYS or UDS_HOTTRACK, 0, 0, 0, 0, frm.Handle,
      0, HInstance, nil);
    SendMessage(spin, UDM_SETRANGE32, FMin, FMax);
    SendMessage(spin, UDM_SETPOS32, 0, Value);
    SendMessage(spin, UDM_SETBUDDY, edt.Handle, 0);

    if FMin >= 0 then
      edt.NumbersOnly := true;
    edt.Text := IntToStr(value);
    edt.OnChange := ValidateIntInput;
    ValidateIntInput(nil);
    result := frm.ShowModal = mrOK;
    if result then Value := StrToInt(edt.Text);
  finally
    frm.Free;
  end;
end;

end.
Run Code Online (Sandbox Code Playgroud)

完整文档(和源代码)将始终在http://specials.rejbrand.se/dev/classes/multiinput/readme.html上找到.

  • +1我绝对不知道怎么会有人贬低这个!! (4认同)

RRU*_*RUZ 11

您可以允许用户只在输入框中输入数字,添加输入框TEdit内部的样式ES_NUMBER值.

检查这个样本.

const
  InputBoxNumberMessage = WM_USER + 666;// a custom message

type
  TForm1 = class(TForm)
    Button1: TButton;
    procedure Button1Click(Sender: TObject);
  private
    procedure InputBoxSetOnlyNumbers(var Msg: TMessage); message InputBoxNumberMessage;
  public
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}



procedure TForm1.Button1Click(Sender: TObject);
var
  InputString: string;
begin
  PostMessage(Handle, InputBoxNumberMessage, 0, 0);
  InputString := InputBox('Input', 'Enter a number', '');
  ShowMessage(InputString);
end;

procedure TForm1.InputBoxSetOnlyNumbers(var Msg: TMessage);
var
  hActiveForm : HWND;
  hEdit       : HWND;
  dwLong      : Longint;
begin
  hActiveForm := Screen.ActiveForm.Handle;
  if (hActiveForm <> 0) then
  begin
    hEdit := FindWindowEx(hActiveForm, 0, 'TEdit', nil);//determine the handle of the TEdit
    dwLong := GetWindowLong(hEdit, GWL_STYLE);//get the current style of the control
    SetWindowLong(hEdit, GWL_STYLE, dwLong or ES_NUMBER)//set the new style
  end;
end;
Run Code Online (Sandbox Code Playgroud)

注意:遗憾的是,此方法不允许验证数字的范围.

小智 5

您可以使用QDialogs单元中的InputQuery,它具有带Min和Max参数的重载版本,用于限制Integer输入的范围.像这样的东西:

var i:Integer;
begin
  i:=0; // Initial value to show the user in the textbox
  if InputQuery('Dialog Caption', 'Please enter the number between 0 and 100:', i, 0, 100) then ShowMessage('Entered: '+IntToStr(i));
end;
Run Code Online (Sandbox Code Playgroud)

不要忘记将QDialog添加到uses子句中,否则将找不到此版本的函数.

但此对话框不会阻止用户输入超出范围的值; 它会默默地"修剪"它到最近的边界.例如,如果用户输入-20,变量"i"将被设置为0.如果他输入200,"i"将被设置为100.我不确定该功能是否适合所有人,但它是一个无需编写任何自定义代码即可实现它的方法.希望这可以帮助.

归档时间：

查看次数：

9889 次

最近记录：

6 年，6 月 前
相关归档
如何保存和恢复表单？ 15
如何实现indexed []默认属性 14
如何找出在Delphi中抛出异常的过程？ 11
XMLTimeToDateTime忽略毫秒 8
当RowCount> VisibleRowCount没有选择网格的第一行时,DBGrid的最顶行中会出现什么数据集行？ 6
Delphi 2009应用程序使用Vista的大图标 5
带突触的IMAP + TLS/SSL？ 5
如何在正则表达式中跳过引用的文本(或如何在Unicode文本中使用HyperStr ParseWord？) 5
按包含数字和字母的字段排序 4
错误无效的PLATFORM变量"MCD" 4
难疑归档
使用jQuery为复选框设置"选中"？ 3988
Git拒绝合并关于rebase的无关历史 1862
查看未发布的Git提交 1649
在UITableView中使用自动布局来获取动态单元格布局和可变行高 1477
如何在Ruby on Rails迁移中重命名数据库列？ 1419
如何在Linux shell脚本中提示是/否/取消输入？ 1352
将JavaScript字符串转换为全部小写？ 1260
对JavaScript对象数组进行排序 1233
如何撤消git reset --hard HEAD~1？ 1083
R无法解析 - Android错误 1056