mmeqdlg.pas

一套及时通讯的原码

{========================================================================}
{=                (c) 1995-98 SwiftSoft Ronald Dittrich                 =}
{========================================================================}
{=                          All Rights Reserved                         =}
{========================================================================}
{=  D 01099 Dresden             = Fax.: [phone]              =}
{=  Loewenstr.7a                = [e-mail]                     =}
{========================================================================}
{=  Actual versions on http://www.swiftsoft.de/mmtools.html             =}
{========================================================================}
{=  This code is for reference purposes only and may not be copied or   =}
{=  distributed in any format electronic or otherwise except one copy   =}
{=  for backup purposes.                                                =}
{=                                                                      =}
{=  No Delphi Component Kit or Component individually or in a collection=}
{=  subclassed or otherwise from the code in this unit, or associated   =}
{=  .pas, .dfm, .dcu, .asm or .obj files may be sold or distributed     =}
{=  without express permission from SwiftSoft.                          =}
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{=  For more licence informations please refer to the associated        =}
{=  HelpFile.                                                           =}
{========================================================================}
{=  $Date: 06.09.98 - 14:25:28 $                                        =}
{========================================================================}
unit MMEQDlg;

{$I COMPILER.INC}

interface

uses
{$IFDEF WIN32}
    Windows,
{$ELSE}
    WinTypes,
    WinProcs,
{$ENDIF}
    SysUtils,
    Messages,
    Consts,
    Classes,
    Dialogs,
    StdCtrls,
    Controls,
    ExtCtrls,
    Forms,
    Mask,
    ComCtrls,
    MMObj,
    MMUtils,
    MMSpin,
    MMEQ,
    MMDIBCv,
    MMSpectr,
    MMDSPObj,
    MMEdit;

type
  {-- TMMEQDlg ----------------------------------------------------------------}
  TMMEQDlgForm = class(TForm)
    OpenDialog: TOpenDialog;
    SaveDialog: TSaveDialog;
    btnSave: TButton;
    btnLoad: TButton;
    btnReset: TButton;
    btnCancel: TButton;
    btnOK: TButton;
    btnClear: TButton;
    FilterComboBox: TComboBox;
    spinf1: TMMSpinButton;
    spinf2: TMMSpinButton;
    spinGain: TMMSpinButton;
    Label1: TLabel;
    Label2: TLabel;
    Label3: TLabel;
    Bevel1: TBevel;
    Label4: TLabel;
    btnAdd: TButton;
    Spectrum: TMMSpectrum;
    TmpEQ: TMMEqualizer;
    mef1: TMMFloatNumberEdit;
    mef2: TMMFloatNumberEdit;
    meGain: TMMFloatNumberEdit;

    procedure btnResetClick(Sender: TObject);
    procedure btnLoadClick(Sender: TObject);
    procedure btnSaveClick(Sender: TObject);
    procedure FormCreate(Sender: TObject);
    procedure FormClose(Sender: TObject; var Action: TCloseAction);
    procedure btnClearClick(Sender: TObject);
    procedure FilterComboBoxChange(Sender: TObject);
    procedure spinChange(Sender: TObject);
    procedure btnAddClick(Sender: TObject);
    procedure maskKeyPress(Sender: TObject; var Key: Char);
    procedure maskExit(Sender: TObject);
    procedure FormShow(Sender: TObject);
  private
    FTitle: String;
    FEQ: TMMEqualizer;
    FBandChange: Boolean;

    procedure SetTitle(aValue: String);
    procedure SetEQ(aValue: TMMEqualizer);
    procedure SetBandChange(aValue: Boolean);
    procedure UpdateControls;
    procedure FillComboBox;
  public
    property BandChange: Boolean read FBandChange write SetBandChange;
    property Title: String read FTitle write SetTitle;
    property Equalizer: TMMEqualizer read FEQ write SetEQ;
  end;

  {-- TMMEqualizerDialog ------------------------------------------------------}
  TMMEqualizerDialog = class(TMMNonVisualComponent)
  private
    FSource    : TMMEqualizer;
    FTitle     : string;
    FBandChange: Boolean;

    procedure SetSource(aSource: TMMEqualizer);

  protected
    procedure Notification(AComponent: TComponent; Operation: TOperation); override;

  public
    constructor Create(AOwner: TComponent); override;
    function Execute: Boolean;

  published
    property AllowBandChange: Boolean read FBandChange write FBandChange;
    property Source: TMMEqualizer read FSource write SetSource;
    property Title: string read FTitle write FTitle;
  end;

var
  MMEQDlgForm: TMMEQDlgForm;

implementation

{$R *.DFM}

{== TMMEQDlgForm ==============================================================}
procedure TMMEQDlgForm.FormCreate(Sender: TObject);
begin
   FTitle      := Caption;
   FEQ         := nil;
   FBandChange := True;
   FilterComboBox.ItemIndex := -1;
end;

{-- TMMEQDlgForm --------------------------------------------------------------}
procedure TMMEQDlgForm.FormShow(Sender: TObject);
begin
   {$IFDEF BUILD_ACTIVEX}
   TmpEQ.Left := -50;
   {$ENDIF}
end;

{-- TMMEQDlgForm --------------------------------------------------------------}
procedure TMMEQDlgForm.FormClose(Sender: TObject; var Action: TCloseAction);
begin
   if (ModalResult = mrOK) then
   begin
      if (FEQ <> nil) then FEQ.Assign(TmpEQ);
   end;
end;

{-- TMMEQDlgForm --------------------------------------------------------------}
procedure TMMEQDlgForm.SetTitle(aValue: String);
begin
   if (aValue <> FTitle) then
   begin
      FTitle := aValue;
      Caption := FTitle + ' -  ' + TmpEQ.Description;
   end;
end;

{-- TMMEQDlgForm --------------------------------------------------------------}
procedure TMMEQDlgForm.SetBandChange(aValue: Boolean);
begin
   if (aValue <> FBandChange) then
   begin
      FBandChange := aValue;
      btnAdd.Enabled   := FBandChange;
      btnClear.Enabled := FBandChange;
   end;
end;

{-- TMMEQDlgForm --------------------------------------------------------------}
procedure TMMEQDlgForm.FillComboBox;
var
   i,old: integer;
begin
   with FilterComboBox,TmpEQ do
   begin
      old := Max(ItemIndex,0);
      Items.Clear;
      for i := 0 to Filters.Count-1 do
      with Filters[i] do
      begin
         Items.Add(IntToStr(i+1));
      end;
      if (old >= 0) and (old < Items.Count) then ItemIndex := old;

      FilterComboBoxChange(FilterComboBox);
   end;
end;

{-- TMMEQDlgForm --------------------------------------------------------------}
procedure TMMEQDlgForm.FilterComboBoxChange(Sender: TObject);
begin
   with FilterComboBox,TmpEQ do
   begin
      if (ItemIndex >= 0) then
      with TmpEQ.Filters[ItemIndex] do
      begin
         mef1.Value      := f1;
         mef2.Value      := f2;
         meGain.Value    := Gain;

         spinf1.Value    := Trunc(f1*100);
         spinf2.Value    := Trunc(f2*100);
         spinGain.Value  := Trunc(Gain*100);

         mef1.Enabled    := True;
         mef2.Enabled    := True;
         meGain.Enabled  := True;

         spinf1.Enabled  := True;
         spinf2.Enabled  := True;
         spinGain.Enabled:= True;
      end
      else
      begin
         mef1.Value      := 0;
         mef2.Value      := 0;
         meGain.Value    := 0;

         spinf1.Value    := 0;
         spinf2.Value    := 0;
         spinGain.Value  := 0;

         mef1.Enabled    := False;
         mef2.Enabled    := False;
         meGain.Enabled  := False;

         spinf1.Enabled  := False;
         spinf2.Enabled  := False;
         spinGain.Enabled:= False;
      end;
   end;
end;

{-- TMMEQDlgForm --------------------------------------------------------------}
procedure TMMEQDlgForm.spinChange(Sender: TObject);
begin
   if FilterComboBox.ItemIndex >= 0 then
   with TmpEQ.Filters[FilterComboBox.ItemIndex] do
   begin
      if Sender = spinf1 then
      begin
         f1 := spinf1.Value/100;
         mef1.Value := f1;
      end
      else if Sender = spinf2 then
      begin
         f2 := spinf2.Value/100;
         mef2.Value := f2;
      end
      else
      begin
         Gain := spinGain.Value/100;
         meGain.Value := Gain;
      end;
   end;
end;

{-- TMMEQDlgForm --------------------------------------------------------------}
procedure TMMEQDlgForm.maskKeyPress(Sender: TObject; var Key: Char);
begin
   if (Key = #13) then TMaskEdit(Sender).OnExit(Sender);
end;

{-- TMMEQDlgForm --------------------------------------------------------------}
procedure TMMEQDlgForm.maskExit(Sender: TObject);
begin
   spinf1.Value   := Trunc(mef1.Value*100);
   spinf2.Value   := Trunc(mef2.Value*100);
   spinGain.Value := Trunc(meGain.Value*100);
end;

{-- TMMEQDlgForm --------------------------------------------------------------}
procedure TMMEQDlgForm.UpdateControls;
begin
   with TmpEQ do
   begin
      Caption := Title + ' -  '+ Description;
      FillComboBox;
   end;
end;

{-- TMMEQDlgForm --------------------------------------------------------------}
procedure TMMEQDlgForm.SetEQ(aValue: TMMEqualizer);
begin
   if (aValue <> Nil) then
   begin
      FEQ := aValue;
      TmpEQ.assign(aValue);
      if (TmpEQ.FFTLength > 512) then
          Spectrum.FFTLength := 512
      else
          Spectrum.FFTLength := 256;
      UpdateControls;
   end;
end;

{-- TMMEQDlgForm --------------------------------------------------------------}
procedure TMMEQDlgForm.btnAddClick(Sender: TObject);
var
   idx: integer;
begin
   if not FBandChange then exit;

   idx := TmpEQ.Filters.AddObject(TMMEQFilter.Create);
   FillComboBox;
   FilterComboBox.ItemIndex := idx;
   UpdateControls;
end;

{-- TMMEQDlgForm --------------------------------------------------------------}
procedure TMMEQDlgForm.btnResetClick(Sender: TObject);
begin
   TmpEQ.assign(FEQ);
   UpdateControls;
end;

{-- TMMEQDlgForm --------------------------------------------------------------}
procedure TMMEQDlgForm.btnClearClick(Sender: TObject);
begin
   if not FBandChange then exit;

   TmpEQ.Filters.FreeAll;
   UpdateControls;
end;

{-- TMMEQDlgForm --------------------------------------------------------------}
procedure TMMEQDlgForm.btnLoadClick(Sender: TObject);
begin
   if OpenDialog.Execute then
   begin
      TmpEQ.Filters.LoadFromFile(OpenDialog.FileName);
      FilterComboBox.ItemIndex := -1;
      UpdateControls;
   end;
end;

{-- TMMEQDlgForm --------------------------------------------------------------}
procedure TMMEQDlgForm.btnSaveClick(Sender: TObject);
begin
   if SaveDialog.Execute then
   begin
      TmpEQ.Filters.SaveToFile(SaveDialog.FileName);
   end;
end;

{== TMMEqualizerDialog ========================================================}
constructor TMMEqualizerDialog.Create(AOwner: TComponent);
begin
   inherited Create(AOwner);

   FTitle      := 'Equalizer Editor';
   FSource     := nil;
   FBandChange := True;

   ErrorCode := ComponentRegistered(InitCode, Self, ClassName);
   if (ErrorCode <> 0) then RegisterFailed(InitCode, Self , ClassName);
end;

{-- TMMEqualizerDialog --------------------------------------------------------}
procedure TMMEqualizerDialog.SetSource(aSource: TMMEqualizer);
begin
   if Longint(aSource) = Longint(Self) then exit;

   if (aSource is TMMEqualizer) or (aSource = Nil) then
   begin
      if (FSource <> aSource) then
      begin
         FSource := aSource;
      end;
   end;
end;

{-- TMMEqualizerDialog --------------------------------------------------------}
procedure TMMEqualizerDialog.Notification(AComponent: TComponent; Operation: TOperation);
begin
   inherited Notification(AComponent, Operation);

   if (Operation = opRemove) and (AComponent = FSource) then
      FSource := Nil;
end;

{-- TMMEqualizerDialog --------------------------------------------------------}
function TMMEqualizerDialog.Execute: Boolean;
begin
   Result := False;
   if assigned(FSource) then
   begin
      with TMMEQDlgForm.Create(Application) do
      try
         Equalizer  := (Self.FSource as TMMEqualizer);
         Title      := Self.FTitle;
         BandChange := Self.FBandChange;
         Result     := (ShowModal = mrOK);

      finally
         Free;
      end;
   end;
end;

end.