mmctrl.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/index.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: 03.11.98 - 21:39:50 $                                        =}
{========================================================================}
unit MMCtrl;

{$I COMPILER.INC}

interface

uses
{$IFDEF WIN32}
    Windows,
{$ELSE}
    WinTypes,
    WinProcs,
{$ENDIF}
    Forms,
    SysUtils,
    Messages,
    Classes,
    Graphics,
    Controls,
    Dialogs,
    ExtCtrls,
    Menus,
    Buttons,
    MMObj,
    MMUtils,
    MMMath,
    MMString,
    MMBmpLst,
    MMObsrv;

type
  TMMOrientation   = (orVertical,orHorizontal);
  TMMZeroPosition  = (zpBottomLeft,zpTopRight);
  TMMGetGylphIndex = procedure(Sender: TObject; IsDown: Boolean; var Index: integer) of object;
  TMMGetBackGround = procedure(Sender: TObject; Bmp: TBitmap; R: TRect) of object;

  {-- TMMBitmapSlider ---------------------------------------------------------}
  TMMBitmapSlider = class(TMMCustomBitmapListControl)
  private
    FAutoSize                : Boolean;
    FDragging                : Boolean;
    FHandCursor              : Boolean;
    FThumbCursor             : TCursor;
    FThumbWidth, FThumbHeight: Byte;
    FMax,FMin,FPosition      : Longint;
    FLineSize                : Integer;
    FPageSize                : Integer;
    FZeroPosition            : TMMZeroPosition;
    FOrientation             : TMMOrientation;
    FSaveBitmap              : TBitmap;
    FDragOffset              : integer;
    FDragVal                 : Longint;
    FThumbRect               : TRect;
    FSensitivity             : integer;
    FLogMode                 : Boolean;
    FNeedTrackEnd            : Boolean;
    FForceChange             : Boolean;
    FMargin                  : integer;
    FNumGlyphs               : integer;
    FNumThumbGlyphs          : integer;
    FBitmapOK                : Boolean;
    FBitmapThumbIndex        : integer;
    FThumbMargin             : integer;

    FOnChange                : TNotifyEvent;
    FOnTrack                 : TNotifyEvent;
    FOnTrackEnd              : TNotifyEvent;
    FOnGetGlyphIndex         : TMMGetGylphIndex;
    FOnGetThumbGlyphIndex    : TMMGetGylphIndex;
    FOnGetBackground         : TMMGetBackGround;

    procedure SetBitmapThumbIndex(aValue: integer);
    procedure SetMargin(aValue: integer);
    procedure SetThumbMargin(aValue: integer);
    procedure UpdateSlider;

    procedure SetAutoSize(aValue: Boolean);
    procedure SetNumThumbGlyphs(aValue: integer);
    procedure SetNumGlyphs(aValue: integer);
    procedure SetMax(aValue: Longint);
    procedure SetMin(aValue: Longint);
    procedure SetOrientation(aValue: TMMOrientation);
    procedure SetZeroPosition(aValue: TMMZeroPosition);
    procedure SetPosition(aValue: Longint);
    function  GetPosition: Longint;
    function  UpdatePosition(aValue: Longint): Boolean;
    procedure SetSensitivity(aValue: integer);
    procedure SetLogMode(aValue: Boolean);
    function  NewPosition(WhereX,WhereY: Integer): Longint;
    function  IsVert: Boolean;
    function  IsInverted: Boolean;
    function  GetSrcRect(index: integer): TRect;
    function  GetThumbSrcRect(index: integer): TRect;
    procedure DrawBitmapImage(Canvas: TCanvas; Bitmap: TBitmap; X,Y: integer; Src: TRect);

    procedure WhereIsThumb(const ClientRect: TRect; var aRect: TRect);
    procedure DrawThumb(Canvas: TCanvas; aRect: TRect);
    procedure RedrawThumb;

    procedure CMEnabledChanged(var Message: TMessage); message CM_ENABLEDCHANGED;
    function  GetThumbBitmap: TBitmap;

  protected
    procedure Change; dynamic;
    procedure Track; dynamic;
    procedure TrackEnd; dynamic;
    procedure Paint; override;
    procedure BitmapChanged; override;
    function  FindTransparentColor: TColor; override;
    procedure SetBounds(aLeft, aTop, aWidth, aHeight: integer); override;
    procedure MouseUp(Button: TMouseButton; Shift: TShiftState; X, Y: Integer); override;
    procedure MouseMove(Shift: TShiftState; X, Y: Integer); override;
    procedure MouseDown(Button: TMouseButton; Shift: TShiftState; X, Y: Integer); override;
    procedure SetThumbCursor(AtThumb: Boolean);

  public
    constructor Create(AOwner: TComponent); override;
    destructor Destroy; override;

    procedure SetMinMax(aMin,aMax: Longint);

    function ThumbBitmapValid: Boolean;
    property ThumbBitmap: TBitmap read GetThumbBitmap;

  published
    property OnDragDrop;
    property OnDragOver;
    property OnEndDrag;
    property OnStartDrag;
    property OnMouseDown;
    property OnMouseMove;
    property OnMouseUp;
    property OnChange: TNotifyEvent read FOnChange write FOnChange;
    property OnTrack: TNotifyEvent read FOnTrack write FOnTrack;
    property OnTrackEnd: TNotifyEvent read FOnTrackEnd write FOnTrackEnd;
    property OnGetGlyphIndex: TMMGetGylphIndex read FOnGetGlyphIndex write FOnGetGlyphIndex;
    property OnGetThumbGlyphIndex: TMMGetGylphIndex read FOnGetThumbGlyphIndex write FOnGetThumbGlyphIndex;
    property OnGetBackground: TMMGetBackground read FOnGetBackground write FOnGetBackground;

    property Width default 200;
    property Height default 40;

    property DragCursor;
    property Visible;
    property Enabled;
    property ParentShowHint;
    property PopupMenu;
    property ShowHint;

    property TransparentColor;
    property TransparentMode;
    property BitmapList;
    property BitmapIndex;
    property BitmapBackIndex;

    property BitmapThumbIndex: Integer read FBitmapThumbIndex write SetBitmapThumbIndex default -1;
    property Margin: integer read FMargin write SetMargin default 2;
    property ThumbMargin: integer read FThumbMargin write SetThumbMargin default 0;
    property NumGlyphs: integer read FNumGlyphs write SetNumGlyphs default 1;
    property NumThumbGlyphs: integer read FNumThumbGlyphs write SetNumThumbGlyphs default 1;
    property AutoSize: Boolean read FAutoSize write SetAutoSize default False;

    property HandCursor: Boolean read FHandCursor write FHandCursor default False;
    property ThumbCursor: TCursor read FThumbCursor write FThumbCursor default crDefault;

    property MinValue: Longint read FMin write SetMin default 0;
    property MaxValue: Longint read FMax write SetMax default 10;
    property LineSize: Integer read FLineSize write FLineSize default 1;
    property PageSize: Integer read FPageSize write FPageSize default 5;
    property Orientation: TMMOrientation read FOrientation write SetOrientation default orHorizontal;
    property ZeroPosition: TMMZeroPosition read FZeroPosition write SetZeroPosition default zpBottomLeft;
    property Position: Longint read GetPosition write SetPosition default 0;

    property Logarithmic: Boolean read FLogMode write SetLogMode default False;
    property Sensitivity: Integer read FSensitivity write SetSensitivity default -24;
    property Transparent;
  end;

implementation

{== TMMBitmapSlider ===========================================================}
constructor TMMBitmapSlider.Create(AOwner: TComponent);
begin
   FBitmapOK := False;

   inherited Create(AOwner);

   ControlStyle := ControlStyle - [csOpaque];

   FAutoSize          := False;
   FNumGlyphs         :=  1;
   FNumThumbGlyphs    :=  1;
   FBitmapThumbIndex  := -1;
   FThumbCursor       := crDefault;
   FForceChange       := False;

   FSaveBitmap        := TBitmap.Create;

   SetBounds(0,0,40,200);

   FHandCursor        := False;
   FMin               := 0;
   FMax               := 10;
   FLineSize          := 1;
   FPageSize          := 5;
   FOrientation       := orHorizontal;
   FZeroPosition      := zpBottomLeft;
   FPosition          := 0;
   FDragging          := False;
   FDragOffset        := 0;
   FDragVal           := 0;
   FSensitivity       := -24;
   FLogMode           := False;
   FNeedTrackEnd      := False;
   FMargin            := 2;
   FThumbMargin       := 0;
   
   ErrorCode := ComponentRegistered(InitCode, Self, ClassName);
   if (ErrorCode <> 0) then RegisterFailed(InitCode, Self , ClassName);
end;

{-- TMMBitmapSlider -----------------------------------------------------}
destructor TMMBitmapSlider.Destroy;
begin
   FSaveBitmap.Free;
   FSaveBitmap := nil;

   inherited Destroy;
end;

{-- TMMBitmapSlider -----------------------------------------------------}
procedure TMMBitmapSlider.BitmapChanged;
begin
   UpdateSlider;
end;

{-- TMMBitmapSlider -----------------------------------------------------------}
procedure TMMBitmapSlider.SetBitmapThumbIndex(aValue: integer);
begin
   if (FBitmapThumbIndex <> aValue) then
   begin
      FBitmapThumbIndex := Max(aValue,-1);
      BitmapChanged;
   end;
end;

{-- TMMBitmapSlider -----------------------------------------------------}
function TMMBitmapSlider.ThumbBitmapValid: Boolean;
begin
   Result := assigned(BitmapList) and (FBitmapThumbIndex >= 0) and (FBitmapThumbIndex <  BitmapList.Count);
end;

{-- TMMBitmapSlider -----------------------------------------------------}
function TMMBitmapSlider.GetThumbBitmap: TBitmap;
begin
   if ThumbBitmapValid then
      Result := BitmapList[BitmapThumbIndex]
   else
      Result := nil;
end;

{-- TMMBitmapSlider -----------------------------------------------------}
procedure TMMBitmapSlider.UpdateSlider;
begin
   if ThumbBitmapValid then
   begin
      FThumbWidth := ThumbBitmap.Width div FNumThumbGlyphs;
      FThumbHeight:= ThumbBitmap.Height;
   end;

   if BitmapValid and AutoSize then
   begin
      { adjust sizes }
      if (Orientation = orHorizontal) then
          SetBounds(Left,Top,Width,Height div FNumGlyphs)
      else
          SetBounds(Left,Top,Width div FNumGlyphs,Height);
   end;

   FBitmapOK := False;

   Invalidate;
end;

{-- TMMBitmapSlider -----------------------------------------------------}
procedure TMMBitmapSlider.SetAutoSize(aValue: Boolean);
begin
   if (aValue <> FAutoSize) then
   begin
      FAutoSize := aValue;
      UpdateSlider;
   end;
end;

{-- TMMBitmapSlider -----------------------------------------------------}
procedure TMMBitmapSlider.Change;
begin
   if (csLoading in ComponentState) or
      (csReading in ComponentState) or
      (csDestroying in ComponentState) then exit;

   if assigned(FOnChange) then FOnChange(Self);
end;