mydialogs.pas

GPRS无线数据管理软件,用于远程数据采集和分析以及展现

begin
  Result := Position.Y;
end;

function TFindDialog.MessageHook(var Msg: TMessage): Boolean;
var
  Option: TFindOption;
  Rect: TRect;
begin
  Result := inherited MessageHook(Msg);
  if not Result then
    if (Msg.Msg = FindMsg) and (Pointer(Msg.LParam) = @FFindReplace) then
    begin
      FOptions := [];
      for Option := Low(Option) to High(Option) do
        if (FFindReplace.Flags and FindOptions[Option]) <> 0 then
          Include(FOptions, Option);
      if (FFindReplace.Flags and FR_FINDNEXT) <> 0 then
        Find
      else
      if (FFindReplace.Flags and (FR_REPLACE or FR_REPLACEALL)) <> 0 then
        Replace
      else
      if (FFindReplace.Flags and FR_DIALOGTERM) <> 0 then
      begin
        GetWindowRect(FFindHandle, Rect);
        FPosition := Rect.TopLeft;
        FFindHandle := 0;
        PostMessage(FRedirector.Handle,CM_RELEASE,0,0); // free redirector later
        FRedirector := nil;
      end;
      Result := True;
    end;
end;

procedure TFindDialog.Replace;
begin
  if Assigned(FOnReplace) then FOnReplace(Self);
end;

procedure TFindDialog.SetFindText(const Value: string);
begin
  StrLCopy(FFindText, PChar(Value), SizeOf(FFindText) - 1);
end;

procedure TFindDialog.SetLeft(Value: Integer);
begin
  SetPosition(Point(Value, Top));
end;

procedure TFindDialog.SetPosition(const Value: TPoint);
begin
  if (FPosition.X <> Value.X) or (FPosition.Y <> Value.Y) then
  begin
    FPosition := Value;
    if FFindHandle <> 0 then
      SetWindowPos(FFindHandle, 0, Value.X, Value.Y, 0, 0,
        SWP_NOACTIVATE or SWP_NOSIZE or SWP_NOZORDER);
  end;
end;

procedure TFindDialog.SetReplaceText(const Value: string);
begin
  StrLCopy(FReplaceText, PChar(Value), SizeOf(FReplaceText) - 1);
end;

procedure TFindDialog.SetTop(Value: Integer);
begin
  SetPosition(Point(Left, Value));
end;

{ TReplaceDialog }

constructor TReplaceDialog.Create(AOwner: TComponent);
begin
  inherited Create(AOwner);
  FFindReplaceFunc := CommDlg.ReplaceText;
end;

{ Message dialog }

function GetAveCharSize(Canvas: TCanvas): TPoint;
var
  I: Integer;
  Buffer: array[0..51] of Char;
begin
  for I := 0 to 25 do Buffer[I] := Chr(I + Ord('A'));
  for I := 0 to 25 do Buffer[I + 26] := Chr(I + Ord('a'));
  GetTextExtentPoint(Canvas.Handle, Buffer, 52, TSize(Result));
  Result.X := Result.X div 52;
end;


type
  TMessageForm = class(TForm)
  private
    Message: TLabel;
    procedure HelpButtonClick(Sender: TObject);
  protected
    procedure CustomKeyDown(Sender: TObject; var Key: Word; Shift: TShiftState);
    procedure WriteToClipBoard(Text: String);
    function GetFormText: String;
  public
    constructor CreateNew(AOwner: TComponent); reintroduce;
  end;

constructor TMessageForm.CreateNew(AOwner: TComponent);
var
  NonClientMetrics: TNonClientMetrics;
begin
  inherited CreateNew(AOwner);
  NonClientMetrics.cbSize := sizeof(NonClientMetrics);
  if SystemParametersInfo(SPI_GETNONCLIENTMETRICS, 0, @NonClientMetrics, 0) then
    Font.Handle := CreateFontIndirect(NonClientMetrics.lfMessageFont);
end;

procedure TMessageForm.HelpButtonClick(Sender: TObject);
begin
  Application.HelpContext(HelpContext);
end;

procedure TMessageForm.CustomKeyDown(Sender: TObject; var Key: Word; Shift: TShiftState);
begin
  if (Shift = [ssCtrl]) and (Key = Word('C')) then
  begin
    Beep;
    WriteToClipBoard(GetFormText);
  end;
end;

procedure TMessageForm.WriteToClipBoard(Text: String);
var
  Data: THandle;
  DataPtr: Pointer;
begin
  if OpenClipBoard(0) then
  begin
    try
      Data := GlobalAlloc(GMEM_MOVEABLE+GMEM_DDESHARE, Length(Text) + 1);
      try
        DataPtr := GlobalLock(Data);
        try
          Move(PChar(Text)^, DataPtr^, Length(Text) + 1);
          EmptyClipBoard;
          SetClipboardData(CF_TEXT, Data);
        finally
          GlobalUnlock(Data);
        end;
      except
        GlobalFree(Data);
        raise;
      end;
    finally
      CloseClipBoard;
    end;
  end
  else
    raise Exception.CreateRes(@SCannotOpenClipboard);
end;

function TMessageForm.GetFormText: String;
var
  DividerLine, ButtonCaptions: string;
  I: integer;
begin
  DividerLine := StringOfChar('-', 27) + sLineBreak;
  for I := 0 to ComponentCount - 1 do
    if Components[I] is TButton then
      ButtonCaptions := ButtonCaptions + TButton(Components[I]).Caption +
        StringOfChar(' ', 3);
  ButtonCaptions := StringReplace(ButtonCaptions,'&','', [rfReplaceAll]);
  Result := Format('%s%s%s%s%s%s%s%s%s%s', [DividerLine, Caption, sLineBreak,
    DividerLine, Message.Caption, sLineBreak, DividerLine, ButtonCaptions,
    sLineBreak, DividerLine]);
end;

var
  Captions: array[TMsgDlgType] of Pointer = (@SMsgDlgWarning, @SMsgDlgError,
    @SMsgDlgInformation, @SMsgDlgConfirm, nil);
  IconIDs: array[TMsgDlgType] of PChar = (IDI_EXCLAMATION, IDI_HAND,
    IDI_ASTERISK, IDI_QUESTION, nil);
  ButtonNames: array[TMsgDlgBtn] of string = (
    'Yes', 'No', 'OK', 'Cancel', 'Abort', 'Retry', 'Ignore', 'All', 'NoToAll',
    'YesToAll', 'Help');
  ButtonCaptions: array[TMsgDlgBtn] of Pointer = (
    @SMsgDlgYes, @SMsgDlgNo, @SMsgDlgOK, @SMsgDlgCancel, @SMsgDlgAbort,
    @SMsgDlgRetry, @SMsgDlgIgnore, @SMsgDlgAll, @SMsgDlgNoToAll, @SMsgDlgYesToAll,
    @SMsgDlgHelp);
  ModalResults: array[TMsgDlgBtn] of Integer = (
    mrYes, mrNo, mrOk, mrCancel, mrAbort, mrRetry, mrIgnore, mrAll, mrNoToAll,
    mrYesToAll, 0);
var
  ButtonWidths : array[TMsgDlgBtn] of integer;  // initialized to zero

function CreateMessageDialog(const Msg: string; DlgType: TMsgDlgType;
  Buttons: TMsgDlgButtons): TForm;
const
  mcHorzMargin = 8;
  mcVertMargin = 8;
  mcHorzSpacing = 10;
  mcVertSpacing = 10;
  mcButtonWidth = 50;
  mcButtonHeight = 14;
  mcButtonSpacing = 4;
var
  DialogUnits: TPoint;
  HorzMargin, VertMargin, HorzSpacing, VertSpacing, ButtonWidth,
  ButtonHeight, ButtonSpacing, ButtonCount, ButtonGroupWidth,
  IconTextWidth, IconTextHeight, X, ALeft: Integer;
  B, DefaultButton, CancelButton: TMsgDlgBtn;
  IconID: PChar;
  TextRect: TRect;
begin
  Result := TMessageForm.CreateNew(Application);
  with Result do
  begin
    BiDiMode := Application.BiDiMode;
    BorderStyle := bsDialog;
    Canvas.Font := Font;
    KeyPreview := True;
    OnKeyDown := TMessageForm(Result).CustomKeyDown;
    DialogUnits := GetAveCharSize(Canvas);
    HorzMargin := MulDiv(mcHorzMargin, DialogUnits.X, 4);
    VertMargin := MulDiv(mcVertMargin, DialogUnits.Y, 8);
    HorzSpacing := MulDiv(mcHorzSpacing, DialogUnits.X, 4);
    VertSpacing := MulDiv(mcVertSpacing, DialogUnits.Y, 8);
    ButtonWidth := MulDiv(mcButtonWidth, DialogUnits.X, 4);
    for B := Low(TMsgDlgBtn) to High(TMsgDlgBtn) do
    begin
      if B in Buttons then
      begin
        if ButtonWidths[B] = 0 then
        begin
          TextRect := Rect(0,0,0,0);
          Windows.DrawText( canvas.handle,
            PChar(LoadResString(ButtonCaptions[B])), -1,
            TextRect, DT_CALCRECT or DT_LEFT or DT_SINGLELINE or
            DrawTextBiDiModeFlagsReadingOnly);
          with TextRect do ButtonWidths[B] := Right - Left + 8;
        end;
        if ButtonWidths[B] > ButtonWidth then
          ButtonWidth := ButtonWidths[B];
      end;
    end;
    ButtonHeight := MulDiv(mcButtonHeight, DialogUnits.Y, 8);
    ButtonSpacing := MulDiv(mcButtonSpacing, DialogUnits.X, 4);
    SetRect(TextRect, 0, 0, Screen.Width div 2, 0);
    DrawText(Canvas.Handle, PChar(Msg), Length(Msg)+1, TextRect,
      DT_EXPANDTABS or DT_CALCRECT or DT_WORDBREAK or
      DrawTextBiDiModeFlagsReadingOnly);
    IconID := IconIDs[DlgType];
    IconTextWidth := TextRect.Right;
    IconTextHeight := TextRect.Bottom;
    if IconID <> nil then
    begin
      Inc(IconTextWidth, 32 + HorzSpacing);
      if IconTextHeight < 32 then IconTextHeight := 32;
    end;
    ButtonCount := 0;
    for B := Low(TMsgDlgBtn) to High(TMsgDlgBtn) do
      if B in Buttons then Inc(ButtonCount);
    ButtonGroupWidth := 0;
    if ButtonCount <> 0 then
      ButtonGroupWidth := ButtonWidth * ButtonCount +
        ButtonSpacing * (ButtonCount - 1);
    ClientWidth := Max(IconTextWidth, ButtonGroupWidth) + HorzMargin * 2;
    ClientHeight := IconTextHeight + ButtonHeight + VertSpacing +
      VertMargin * 2;
    Left := (Screen.Width div 2) - (Width div 2);
    Top := (Screen.Height div 2) - (Height div 2);
    if DlgType <> mtCustom then
      Caption := LoadResString(Captions[DlgType]) else
      Caption := Application.Title;
    if IconID <> nil then
      with TImage.Create(Result) do
      begin
        Name := 'Image';
        Parent := Result;
        Picture.Icon.Handle := LoadIcon(0, IconID);
        SetBounds(HorzMargin, VertMargin, 32, 32);
      end;
    TMessageForm(Result).Message := TLabel.Create(Result);
    with TMessageForm(Result).Message do
    begin
      Name := 'Message';
      Parent := Result;
      WordWrap := True;
      Caption := Msg;
      BoundsRect := TextRect;
      BiDiMode := Result.BiDiMode;
      ALeft := IconTextWidth - TextRect.Right + HorzMargin;
      if UseRightToLeftAlignment then
        ALeft := Result.ClientWidth - ALeft - Width;
      SetBounds(ALeft, VertMargin,
        TextRect.Right, TextRect.Bottom);
    end;
    if mbOk in Buttons then DefaultButton := mbOk else
      if mbYes in Buttons then DefaultButton := mbYes else
        DefaultButton := mbRetry;
    if mbCancel in Buttons then CancelButton := mbCancel else
      if mbNo in Buttons then CancelButton := mbNo else
        CancelButton := mbOk;
    X := (ClientWidth - ButtonGroupWidth) div 2;
    for B := Low(TMsgDlgBtn) to High(TMsgDlgBtn) do
      if B in Buttons then
        with TButton.Create(Result) do
        begin
          Name := ButtonNames[B];
          Parent := Result;
          Caption := LoadResString(ButtonCaptions[B]);
          ModalResult := ModalResults[B];
          if B = DefaultButton then Default := True;
          if B = CancelButton then Cancel := True;
          SetBounds(X, IconTextHeight + VertMargin + VertSpacing,
            ButtonWidth, ButtonHeight);
          Inc(X, ButtonWidth + ButtonSpacing);
          if B = mbHelp then
            OnClick := TMessageForm(Result).HelpButtonClick;
        end;
  end;
end;

function MessageDlg(const Msg: string; DlgType: TMsgDlgType;
  Buttons: TMsgDlgButtons; HelpCtx: Longint): Integer;
begin
  Result := MessageDlgPosHelp(Msg, DlgType, Buttons, HelpCtx, -1, -1, '');
end;

function MessageDlgPos(const Msg: string; DlgType: TMsgDlgType;
  Buttons: TMsgDlgButtons; HelpCtx: Longint; X, Y: Integer): Integer;
begin
  Result := MessageDlgPosHelp(Msg, DlgType, Buttons, HelpCtx, X, Y, '');
end;

function MessageDlgPosHelp(const Msg: string; DlgType: TMsgDlgType;
  Buttons: TMsgDlgButtons; HelpCtx: Longint; X, Y: Integer;
  const HelpFileName: string): Integer;
begin
  with CreateMessageDialog(Msg, DlgType, Buttons) do
    try
      HelpContext := HelpCtx;
      HelpFile := HelpFileName;
      if X >= 0 then Left := X;
      if Y >= 0 then Top := Y;
      if (Y < 0) and (X < 0) then Position := poScreenCenter;
      Result := ShowModal;
    finally
      Free;
    end;
end;

procedure ShowMessage(const Msg: string);
begin
  ShowMessagePos(Msg, -1, -1);
end;

procedure ShowMessageFmt(const Msg: string; Params: array of const);
begin
  ShowMessage(Format(Msg, Params));
end;

procedure ShowMessagePos(const Msg: string; X, Y: Integer);
begin
  MessageDlgPos(Msg, mtCustom, [mbOK], 0, X, Y);
end;

{ Input dialog }

function InputQuery(const ACaption, APrompt: string;
  var Value: string): Boolean;
var
  Form: TForm;
  Prompt: TLabel;
  Edit: TEdit;
  DialogUnits: TPoint;
  ButtonTop, ButtonWidth, ButtonHeight: Integer;
begin
  Result := False;
  Form := TForm.Create(Application);
  with Form do
    try
      Canvas.Font := Font;
      DialogUnits := GetAveCharSize(Canvas);
      BorderStyle := bsDialog;
      Caption := ACaption;
      ClientWidth := MulDiv(180, DialogUnits.X, 4);
      Position := poScreenCenter;
      Prompt := TLabel.Create(Form);
      with Prompt do
      begin
        Parent := Form;
        Caption := APrompt;
        Left := MulDiv(8, DialogUnits.X, 4);
        Top := MulDiv(8, DialogUnits.Y, 8);
        Constraints.MaxWidth := MulDiv(164, DialogUnits.X, 4);
        WordWrap := True;
      end;
      Edit := TEdit.Create(Form);
      with Edit do
      begin
        Parent := Form;
        Left := Prompt.Left;
        Top := Prompt.Top + Prompt.Height + 5;
        Width := MulDiv(164, DialogUnits.X, 4);
        MaxLength := 255;
        Text := Value;
        SelectAll;
      end;
      ButtonTop := Edit.Top + Edit.Height + 15;
      ButtonWidth := MulDiv(50, DialogUnits.X, 4);
      ButtonHeight := MulDiv(14, DialogUnits.Y, 8);
      with TButton.Create(Form) do
      begin
        Parent := Form;
        Caption := SMsgDlgOK;
        ModalResult := mrOk;
        Default := True;
        SetBounds(MulDiv(38, DialogUnits.X, 4), ButtonTop, ButtonWidth,
          ButtonHeight);
      end;
      with TButton.Create(Form) do
      begin
        Parent := Form;
        Caption := SMsgDlgCancel;
        ModalResult := mrCancel;
        Cancel := True;
        SetBounds(MulDiv(92, DialogUnits.X, 4), Edit.Top + Edit.Height + 15,
          ButtonWidth, ButtonHeight);
        Form.ClientHeight := Top + Height + 13;          
      end;
      if ShowModal = mrOk then
      begin
        Value := Edit.Text;
        Result := True;
      end;
    finally
      Form.Free;
    end;
end;

function InputBox(const ACaption, APrompt, ADefault: string): string;
begin
  Result := ADefault;
  InputQuery(ACaption, APrompt, Result);
end;

function PromptForFileName(var AFileName: string; const AFilter: string = '';
  const ADefaultExt: string = ''; const ATitle: string = '';
  const AInitialDir: string = ''; SaveDialog: Boolean = False): Boolean;
var
  Dialog: TOpenDialog;
begin
  if SaveDialog then
  begin
    Dialog := TSaveDialog.Create(nil);
    Dialog.Options := Dialog.Options + [ofOverwritePrompt];
  end
  else
    Dialog := TOpenDialog.Create(nil);
  with Dialog do
  try
    Title := ATitle;
    DefaultExt := ADefaultExt;
    if AFilter = '' then
      Filter := SDefaultFilter else
      Filter := AFilter;
    InitialDir := AInitialDir;
    FileName := AFileName;
    Result := Execute;
    if Result then
      AFileName := FileName;
  finally
    Free;
  end;
end;

{ Initialization and cleanup }

procedure InitGlobals;
var
  AtomText: array[0..31] of Char;
begin
  HelpMsg := RegisterWindowMessage(HelpMsgString);
  FindMsg := RegisterWindowMessage(FindMsgString);
  WndProcPtrAtom := GlobalAddAtom(StrFmt(AtomText,
    'WndProcPtr%.8X%.8X', [HInstance, GetCurrentThreadID]));
end;

initialization
  InitGlobals;
  GroupDescendentsWith(TCommonDialog, TControl);
finalization
  if WndProcPtrAtom <> 0 then GlobalDeleteAtom(WndProcPtrAtom);
end.