自动从文本文件追加/完成到编辑框delphi

时间：2011-03-28 22:01:48

标签： delphi autocomplete

我正在尝试创建一个编辑框，我希望它能够在输入时自动附加输入的文本。文本将附加文本文件中的“建议”。

假设我的建议文件中有这些： 玛丽莲·梦露 马龙白兰度 迈克迈尔斯

当我开始在编辑框中输入“M”时，剩余部分会突出显示（或不显示）： “arilyn Monroe” 当我一直输入“Mi”时，“ke Myers”会出现在最后。我希望我能为你们清楚地说明这一点！谢谢你的帮助！

2 个答案:

答案 0 :(得分：43)

您需要实施并注册IAutoComplete2。

这就是使用TEdit（Andreas :)的阴影：）

enter image description here enter image description here

更多信息 here ，包括实施上述所有内容的示例代码。

编辑：发布更新以提供TAutoCompleteEdit组件，注册单元，包源和快速示例应用程序的源代码。 （上面链接的网站似乎已关闭或已消失。）在Delphi XE中编译和测试。复制上面的图像，但使用ACStrings属性而不是TMemo来提供自动完成的项目。

组件：

unit uAutoComplete;

interface

uses 
  Windows, SysUtils, Controls, Classes, ActiveX, ComObj, stdctrls, Forms,
  Messages;

const
  IID_IAutoComplete: TGUID = '{00bb2762-6a77-11d0-a535-00c04fd7d062}';
  IID_IAutoComplete2: TGUID = '{EAC04BC0-3791-11d2-BB95-0060977B464C}';
  CLSID_IAutoComplete: TGUID = '{00BB2763-6A77-11D0-A535-00C04FD7D062}';

  IID_IACList: TGUID = '{77A130B0-94FD-11D0-A544-00C04FD7d062}';
  IID_IACList2: TGUID = '{470141a0-5186-11d2-bbb6-0060977b464c}';

  CLSID_ACLHistory: TGUID = '{00BB2764-6A77-11D0-A535-00C04FD7D062}';
  CLSID_ACListISF: TGUID = '{03C036F1-A186-11D0-824A-00AA005B4383}';
  CLSID_ACLMRU: TGUID = '{6756a641-de71-11d0-831b-00aa005b4383}';

type

  IACList = interface(IUnknown)
  ['{77A130B0-94FD-11D0-A544-00C04FD7d062}']
    function Expand(pszExpand : POLESTR) : HResult; stdcall;
  end;

const
  //options for IACList2
  ACLO_NONE = 0;          // don't enumerate anything
  ACLO_CURRENTDIR = 1;    // enumerate current directory
  ACLO_MYCOMPUTER = 2;    // enumerate MyComputer
  ACLO_DESKTOP = 4;       // enumerate Desktop Folder
  ACLO_FAVORITES = 8;     // enumerate Favorites Folder
  ACLO_FILESYSONLY = 16;  // enumerate only the file system

type
  IACList2 = interface(IACList)
  ['{470141a0-5186-11d2-bbb6-0060977b464c}']
    function SetOptions(dwFlag: DWORD): HResult; stdcall;
    function GetOptions(var pdwFlag: DWORD): HResult; stdcall;
  end;

  IAutoComplete = interface(IUnknown)
  ['{00bb2762-6a77-11d0-a535-00c04fd7d062}']
    function Init(hwndEdit: HWND; const punkACL: IUnknown; 
      pwszRegKeyPath, pwszQuickComplete: POLESTR): HResult; stdcall;
    function Enable(fEnable: BOOL): HResult; stdcall;
  end;

const
  //options for IAutoComplete2
  ACO_NONE = 0;
  ACO_AUTOSUGGEST = $1;
  ACO_AUTOAPPEND = $2;
  ACO_SEARCH = $4;
  ACO_FILTERPREFIXES = $8;
  ACO_USETAB = $10;
  ACO_UPDOWNKEYDROPSLIST = $20;
  ACO_RTLREADING = $40;

type
  IAutoComplete2 = interface(IAutoComplete)
  ['{EAC04BC0-3791-11d2-BB95-0060977B464C}']
    function SetOptions(dwFlag: DWORD): HResult; stdcall;
    function GetOptions(out pdwFlag: DWORD): HResult; stdcall;
  end;

  TEnumString = class(TInterfacedObject, IEnumString)
  private
    FStrings: TStringList;
    FCurrIndex: integer;
  public
    //IEnumString
    function Next(celt: Longint; out elt;  
        pceltFetched: PLongint): HResult; stdcall;
    function Skip(celt: Longint): HResult; stdcall;
    function Reset: HResult; stdcall;
    function Clone(out enm: IEnumString): HResult; stdcall;
    //VCL
    constructor Create;
    destructor Destroy;override;
  end;

  TACOption = (acAutoAppend, acAutoSuggest, acUseArrowKey);
  TACOptions = set of TACOption;

  TACSource = (acsList, acsHistory, acsMRU, acsShell);

  TAutoCompleteEdit = class(TEdit)
  private
    FACList: TEnumString;
    FEnumString: IEnumString;
    FAutoComplete: IAutoComplete;
    FACEnabled: boolean;
    FACOptions: TACOptions;
    FACSource: TACSource;
    function GetACStrings: TStringList;
    procedure SetACEnabled(const Value: boolean);
    procedure SetACOptions(const Value: TACOptions);
    procedure SetACSource(const Value: TACSource);
    procedure SetACStrings(const Value: TStringList);
  protected
    procedure CreateWnd; override;
    procedure DestroyWnd; override;
  public
    constructor Create(AOwner: TComponent); override;
  published
    property ACEnabled: boolean read FACEnabled write SetACEnabled;
    property ACOptions: TACOptions read FACOptions write SetACOptions;
    property ACSource: TACSource read FACSource write SetACSource;
    property ACStrings: TStringList read GetACStrings write SetACStrings;
  end;

implementation

{ IUnknownInt }

function TEnumString.Clone(out enm: IEnumString): HResult;
begin
  Result := E_NOTIMPL;
  Pointer(enm) := nil;
end;

constructor TEnumString.Create;
begin
  inherited Create;
  FStrings := TStringList.Create;
  FCurrIndex := 0;
end;

destructor TEnumString.Destroy;
begin
  FStrings.Free;
  inherited;
end;

function TEnumString.Next(celt: Integer; out elt;
  pceltFetched: PLongint): HResult;
var 
  I: Integer;
  wStr: WideString;
begin
  I := 0;
  while (I < celt) and (FCurrIndex < FStrings.Count) do
  begin
    wStr := FStrings[FCurrIndex];
    TPointerList(elt)[I] := Pointer(wStr);
    Pointer(wStr) := nil;
    Inc(I);
    Inc(FCurrIndex);
  end;
  if pceltFetched <> nil then 
    pceltFetched^ := I;
  if I = celt then 
    Result := S_OK 
  else 
    Result := S_FALSE;
end;

function TEnumString.Reset: HResult;
begin
  FCurrIndex := 0;
  Result := S_OK;
end;

function TEnumString.Skip(celt: Integer): HResult;
begin
  if (FCurrIndex + celt) <= FStrings.Count then
  begin
    Inc(FCurrIndex, celt);
    Result := S_OK;
  end
  else
  begin
    FCurrIndex := FStrings.Count;
    Result := S_FALSE;
  end;
end;

{ TACEdit }

constructor TAutoCompleteEdit.Create(AOwner: TComponent);
begin
  inherited;
  FACList := TEnumString.Create;
  FEnumString := FACList;
  FACEnabled := True;
  FACOptions := [acAutoAppend, acAutoSuggest, acUseArrowKey];
end;

procedure TAutoCompleteEdit.CreateWnd;
var 
  Dummy: IUnknown;
  Strings: IEnumString;
begin
  inherited;
  if HandleAllocated then 
  begin
    try
      Dummy := CreateComObject(CLSID_IAutoComplete);
      if (Dummy <> nil) and 
         (Dummy.QueryInterface(IID_IAutoComplete, FAutoComplete) = S_OK) then 
      begin
        case FACSource of
          acsHistory: Strings := CreateComObject(CLSID_ACLHistory) as
            IEnumString;
          acsMRU: Strings := CreateComObject(CLSID_ACLMRU) as
            IEnumString;
          acsShell: Strings := CreateComObject(CLSID_ACListISF) as
            IEnumString;
        else 
          Strings := FACList as IEnumString;
        end;
        if S_OK = FAutoComplete.Init(Handle, Strings, nil, nil) then 
        begin
          SetACEnabled(FACEnabled);
          SetACOptions(FACOptions);
        end;
      end;
    except
      //CLSID_IAutoComplete is not available
    end;
  end;
end;

procedure TAutoCompleteEdit.DestroyWnd;
begin
  if (FAutoComplete <> nil) then 
  begin
    FAutoComplete.Enable(False);
    FAutoComplete := nil;
  end;
  inherited;
end;

function TAutoCompleteEdit.GetACStrings: TStringList;
begin
  Result := FACList.FStrings;
end;

procedure TAutoCompleteEdit.SetACEnabled(const Value: Boolean);
begin
  if (FAutoComplete <> nil) then 
  begin
    FAutoComplete.Enable(FACEnabled);
  end;
  FACEnabled := Value;
end;

procedure TAutoCompleteEdit.SetACOptions(const Value: TACOptions);
const 
  Options : array[TACOption] of integer = (ACO_AUTOAPPEND,
                                           ACO_AUTOSUGGEST,
                                           ACO_UPDOWNKEYDROPSLIST);
var 
  Option:TACOption;
  Opt: DWORD;
  AC2: IAutoComplete2;
begin
  if (FAutoComplete <> nil) then 
  begin
    if S_OK = FAutoComplete.QueryInterface(IID_IAutoComplete2, AC2) then
    begin
      Opt := ACO_NONE;
      for Option := Low(Options) to High(Options) do 
      begin
        if (Option in FACOptions) then 
          Opt := Opt or DWORD(Options[Option]);
      end;
      AC2.SetOptions(Opt);
    end;
  end;
  FACOptions := Value;
end;

procedure TAutoCompleteEdit.SetACSource(const Value: TACSource);
begin
  if FACSource <> Value then 
  begin
    FACSource := Value;
    RecreateWnd;
  end;
end;

procedure TAutoCompleteEdit.SetACStrings(const Value: TStringList);
begin
  if Value <> FACList.FStrings then
    FACList.FStrings.Assign(Value);
end;

end.

注册单位：

unit AutoCompletEditReg;

interface

uses
  uAutoComplete;

procedure Register;

implementation

uses
  Classes;

procedure Register;
begin
  RegisterComponents('AutoComplete', [TAutoCompleteEdit]);
end;

end.

包源：

package AutoCompleteEditPkg;

{$R *.res}
{$ALIGN 8}
{$ASSERTIONS ON}
{$BOOLEVAL OFF}
{$DEBUGINFO ON}
{$EXTENDEDSYNTAX ON}
{$IMPORTEDDATA ON}
{$IOCHECKS ON}
{$LOCALSYMBOLS ON}
{$LONGSTRINGS ON}
{$OPENSTRINGS ON}
{$OPTIMIZATION ON}
{$OVERFLOWCHECKS OFF}
{$RANGECHECKS OFF}
{$REFERENCEINFO ON}
{$SAFEDIVIDE OFF}
{$STACKFRAMES OFF}
{$TYPEDADDRESS OFF}
{$VARSTRINGCHECKS ON}
{$WRITEABLECONST OFF}
{$MINENUMSIZE 1}
{$IMAGEBASE $400000}
{$IMPLICITBUILD ON}

requires
  rtl;

contains
  AutoCompletEditReg in 'AutoCompletEditReg.pas';

end.

测试单元和表格。 DFM文件：

object Form1: TForm1
  Left = 0
  Top = 0
  Caption = 'Form1'
  ClientHeight = 202
  ClientWidth = 447
  Color = clBtnFace
  Font.Charset = DEFAULT_CHARSET
  Font.Color = clWindowText
  Font.Height = -11
  Font.Name = 'Tahoma'
  Font.Style = []
  OldCreateOrder = False
  PixelsPerInch = 96
  TextHeight = 13
  object AutoCompleteEdit1: TAutoCompleteEdit
    Left = 24
    Top = 24
    Width = 121
    Height = 21
    TabOrder = 0
    Text = 'AutoCompleteEdit1'
    ACEnabled = True
    ACOptions = [acAutoAppend, acAutoSuggest, acUseArrowKey]
    ACSource = acsList
    ACStrings.Strings = (
      'and'
      'array'
      'as'
      'asm'
      'begin'
      'case'
      'class'
      'const'
      'constructor'
      'destructor'
      'dispinterface'
      'div'
      'do'
      'downto'
      'else'
      'end'
      'except'
      'exports'
      'file'
      'finalization'
      'finally'
      'for'
      'function'
      'goto'
      'if'
      'implementation'
      'in'
      'inherited'
      'initialization'
      'inline'
      'interface'
      'is'
      'label'
      'library'
      'mod'
      'nil'
      'not'
      'object'
      'of'
      'or'
      'out'
      'packed'
      'procedure'
      'program'
      'property'
      'raise'
      'record'
      'repeat'
      'resourcestring'
      'set'
      'shl'
      'shr'
      'string'
      'then'
      'threadvar'
      'to'
      'try'
      'type'
      'unit'
      'until'
      'uses'
      'var'
      'while'
      'with'
      'xor')
  end
end

测试单位：

unit ACEditTestUnit;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls, uAutoComplete;

type
  TForm1 = class(TForm)
    AutoCompleteEdit1: TAutoCompleteEdit;
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

end.

答案 1 :(得分：14)

您可以使用TComboBox轻松实现此功能。

按照以下步骤操作：

  
      
  • 在表单中放置一个组合框
    •   
  • 将autocomplete属性设置为true
    •   
  • 将sorted属性设置为true
    •   
  • 将style属性设置为csDropDown
    •   
  • 在组合框的OnExit事件中添加如下代码
    •   
const
MaxHistory=200;//max number of items


procedure TForm1.ComboBoxSearchExit(Sender: TObject);
begin
   //check if the text entered exist in the list, if not add to the list
   if (Trim(ComboBoxSearch.Text)<>'') and (ComboBoxSearch.Items.IndexOf(ComboBoxSearch.Text)=-1) then 
   begin
     if ComboBoxSearch.Items.Count=MaxHistory then
     ComboBoxSearch.Items.Delete(ComboBoxSearch.Items.Count-1);
     ComboBoxSearch.Items.Insert(0,ComboBoxSearch.Text);
   end;
end;
  
      
  • 保存组合框的历史记录，例如在您的OnClose事件中   形式
    •   
procedure TForm1.FormClose(Sender: TObject);
begin
   ComboBoxSearch.Items.SaveToFile(ExtractFilePath(ParamStr(0))+'History.txt');
end;
  
      
  • 在表单的Oncreate事件中，您可以加载已保存的项目
    •   
procedure TForm1.FormCreate(Sender: TObject);
var
 FileHistory  : string;
begin
   FileHistory:=ExtractFilePath(ParamStr(0))+'History.txt';
   if FileExists(FileHIstory) then
   ComboBoxSearch.Items.LoadFromFile(FileHistory);
end;
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