Marco Cantù 1998, Mastering Delphi 4
Package: MD4XARR.DPK
Package Structure
XARROW_TLB.PAS
unit XArrow_TLB;
// ************************************************************************ //
// WARNING //
// ------- //
// The types declared in this file were generated from data read from a //
// Type Library. If this type library is explicitly or indirectly (via //
// another type library referring to this type library) re-imported, or the //
// 'Refresh' command of the Type Library Editor activated while editing the //
// Type Library, the contents of this file will be regenerated and all //
// manual modifications will be lost. //
// ************************************************************************ //
// PASTLWTR : $Revision: 1.11.1.63 $
// File generated on 6/23/98 7:17:56 PM from Type Library described below.
// ************************************************************************ //
// Type Lib: C:\MD4CODE\PART4\19\XARROW\XARROW.OCX
// IID\LCID: {5551EB00-0AC6-11D2-B9F1-004845400FAA}\0
// Helpfile:
// HelpString: XArrow Library
// Version: 1.0
// ************************************************************************ //
interface
uses Windows, ActiveX, Classes, Graphics, OleCtrls, StdVCL;
// *********************************************************************//
// GUIDS declared in the TypeLibrary. Following prefixes are used: //
// Type Libraries : LIBID_xxxx //
// CoClasses : CLASS_xxxx //
// DISPInterfaces : DIID_xxxx //
// Non-DISP interfaces: IID_xxxx //
// *********************************************************************//
const
LIBID_XArrow: TGUID = '{5551EB00-0AC6-11D2-B9F1-004845400FAA}';
IID_IMd4WArrowX: TGUID = '{5551EB23-0AC6-11D2-B9F1-004845400FAA}';
DIID_IMd4WArrowXEvents: TGUID = '{5551EB25-0AC6-11D2-B9F1-004845400FAA}';
CLASS_Md4WArrowX: TGUID = '{5551EB27-0AC6-11D2-B9F1-004845400FAA}';
// *********************************************************************//
// Declaration of Enumerations defined in Type Library //
// *********************************************************************//
// TxMd4WArrowDir constants
type
TxMd4WArrowDir = TOleEnum;
const
adUp = $00000000;
adLeft = $00000001;
adDown = $00000002;
adRight = $00000003;
// TxMouseButton constants
type
TxMouseButton = TOleEnum;
const
mbLeft = $00000000;
mbRight = $00000001;
mbMiddle = $00000002;
// TxAlignment constants
type
TxAlignment = TOleEnum;
const
taLeftJustify = $00000000;
taRightJustify = $00000001;
taCenter = $00000002;
// TxBiDiMode constants
type
TxBiDiMode = TOleEnum;
const
bdLeftToRight = $00000000;
bdRightToLeft = $00000001;
bdRightToLeftNoAlign = $00000002;
bdRightToLeftReadingOnly = $00000003;
type
// *********************************************************************//
// Forward declaration of interfaces defined in Type Library //
// *********************************************************************//
IMd4WArrowX = interface;
IMd4WArrowXDisp = dispinterface;
IMd4WArrowXEvents = dispinterface;
// *********************************************************************//
// Declaration of CoClasses defined in Type Library //
// (NOTE: Here we map each CoClass to its Default Interface) //
// *********************************************************************//
Md4WArrowX = IMd4WArrowX;
// *********************************************************************//
// Interface: IMd4WArrowX
// Flags: (4416) Dual OleAutomation Dispatchable
// GUID: {5551EB23-0AC6-11D2-B9F1-004845400FAA}
// *********************************************************************//
IMd4WArrowX = interface(IDispatch)
['{5551EB23-0AC6-11D2-B9F1-004845400FAA}']
function Get_Direction: TxMd4WArrowDir; safecall;
procedure Set_Direction(Value: TxMd4WArrowDir); safecall;
function Get_ArrowHeight: Integer; safecall;
procedure Set_ArrowHeight(Value: Integer); safecall;
function Get_Filled: WordBool; safecall;
procedure Set_Filled(Value: WordBool); safecall;
function Get_DoubleBuffered: WordBool; safecall;
procedure Set_DoubleBuffered(Value: WordBool); safecall;
procedure FlipChildren(AllLevels: WordBool); safecall;
function DrawTextBiDiModeFlags(Flags: Integer): Integer; safecall;
function DrawTextBiDiModeFlagsReadingOnly: Integer; safecall;
function Get_Enabled: WordBool; safecall;
procedure Set_Enabled(Value: WordBool); safecall;
function GetControlsAlignment: TxAlignment; safecall;
procedure InitiateAction; safecall;
function IsRightToLeft: WordBool; safecall;
function UseRightToLeftAlignment: WordBool; safecall;
function UseRightToLeftReading: WordBool; safecall;
function UseRightToLeftScrollBar: WordBool; safecall;
function Get_BiDiMode: TxBiDiMode; safecall;
procedure Set_BiDiMode(Value: TxBiDiMode); safecall;
function Get_Visible: WordBool; safecall;
procedure Set_Visible(Value: WordBool); safecall;
function Get_Cursor: Smallint; safecall;
procedure Set_Cursor(Value: Smallint); safecall;
function ClassNameIs(const Name: WideString): WordBool; safecall;
function Get_FillColor: Integer; safecall;
procedure Set_FillColor(Value: Integer); safecall;
function Get_PenColor: Integer; safecall;
procedure Set_PenColor(Value: Integer); safecall;
property Direction: TxMd4WArrowDir read Get_Direction write Set_Direction;
property ArrowHeight: Integer read Get_ArrowHeight write Set_ArrowHeight;
property Filled: WordBool read Get_Filled write Set_Filled;
property DoubleBuffered: WordBool read Get_DoubleBuffered write Set_DoubleBuffered;
property Enabled: WordBool read Get_Enabled write Set_Enabled;
property BiDiMode: TxBiDiMode read Get_BiDiMode write Set_BiDiMode;
property Visible: WordBool read Get_Visible write Set_Visible;
property Cursor: Smallint read Get_Cursor write Set_Cursor;
property FillColor: Integer read Get_FillColor write Set_FillColor;
property PenColor: Integer read Get_PenColor write Set_PenColor;
end;
// *********************************************************************//
// DispIntf: IMd4WArrowXDisp
// Flags: (4416) Dual OleAutomation Dispatchable
// GUID: {5551EB23-0AC6-11D2-B9F1-004845400FAA}
// *********************************************************************//
IMd4WArrowXDisp = dispinterface
['{5551EB23-0AC6-11D2-B9F1-004845400FAA}']
property Direction: TxMd4WArrowDir dispid 1;
property ArrowHeight: Integer dispid 2;
property Filled: WordBool dispid 3;
property DoubleBuffered: WordBool dispid 6;
procedure FlipChildren(AllLevels: WordBool); dispid 7;
function DrawTextBiDiModeFlags(Flags: Integer): Integer; dispid 10;
function DrawTextBiDiModeFlagsReadingOnly: Integer; dispid 11;
property Enabled: WordBool dispid -514;
function GetControlsAlignment: TxAlignment; dispid 12;
procedure InitiateAction; dispid 14;
function IsRightToLeft: WordBool; dispid 15;
function UseRightToLeftAlignment: WordBool; dispid 20;
function UseRightToLeftReading: WordBool; dispid 21;
function UseRightToLeftScrollBar: WordBool; dispid 22;
property BiDiMode: TxBiDiMode dispid 23;
property Visible: WordBool dispid 24;
property Cursor: Smallint dispid 25;
function ClassNameIs(const Name: WideString): WordBool; dispid 29;
property FillColor: Integer dispid 4;
property PenColor: Integer dispid 5;
end;
// *********************************************************************//
// DispIntf: IMd4WArrowXEvents
// Flags: (4096) Dispatchable
// GUID: {5551EB25-0AC6-11D2-B9F1-004845400FAA}
// *********************************************************************//
IMd4WArrowXEvents = dispinterface
['{5551EB25-0AC6-11D2-B9F1-004845400FAA}']
procedure OnClick; dispid 1;
procedure OnArrowDblClick; dispid 8;
end;
// *********************************************************************//
// OLE Control Proxy class declaration
// Control Name : TMd4WArrowX
// Help String : Md4WArrowX Control
// Default Interface: IMd4WArrowX
// Def. Intf. DISP? : No
// Event Interface: IMd4WArrowXEvents
// TypeFlags : (38) CanCreate Licensed Control
// *********************************************************************//
TMd4WArrowX = class(TOleControl)
private
FOnClick: TNotifyEvent;
FOnArrowDblClick: TNotifyEvent;
FIntf: IMd4WArrowX;
function GetControlInterface: IMd4WArrowX;
protected
procedure CreateControl;
procedure InitControlData; override;
public
procedure FlipChildren(AllLevels: WordBool);
function DrawTextBiDiModeFlags(Flags: Integer; out Value: Integer): Integer;
function DrawTextBiDiModeFlagsReadingOnly(out Value: Integer): Integer;
function GetControlsAlignment(out Value: TxAlignment): TxAlignment;
procedure InitiateAction;
function IsRightToLeft(out Value: WordBool): WordBool;
function UseRightToLeftAlignment(out Value: WordBool): WordBool;
function UseRightToLeftReading(out Value: WordBool): WordBool;
function UseRightToLeftScrollBar(out Value: WordBool): WordBool;
function ClassNameIs(const Name: WideString; out Value: WordBool): WordBool;
property ControlInterface: IMd4WArrowX read GetControlInterface;
property DoubleBuffered: WordBool index 6 read GetWordBoolProp write SetWordBoolProp;
property Enabled: WordBool index -514 read GetWordBoolProp write SetWordBoolProp;
property BiDiMode: TOleEnum index 23 read GetTOleEnumProp write SetTOleEnumProp;
property Visible: WordBool index 24 read GetWordBoolProp write SetWordBoolProp;
published
property TabStop;
property Align;
property DragCursor;
property DragMode;
property ParentShowHint;
property PopupMenu;
property ShowHint;
property TabOrder;
property OnDragDrop;
property OnDragOver;
property OnEndDrag;
property OnEnter;
property OnExit;
property OnStartDrag;
property Direction: TOleEnum index 1 read GetTOleEnumProp write SetTOleEnumProp stored False;
property ArrowHeight: Integer index 2 read GetIntegerProp write SetIntegerProp stored False;
property Filled: WordBool index 3 read GetWordBoolProp write SetWordBoolProp stored False;
property Cursor: Smallint index 25 read GetSmallintProp write SetSmallintProp stored False;
property FillColor: Integer index 4 read GetIntegerProp write SetIntegerProp stored False;
property PenColor: Integer index 5 read GetIntegerProp write SetIntegerProp stored False;
property OnClick: TNotifyEvent read FOnClick write FOnClick;
property OnArrowDblClick: TNotifyEvent read FOnArrowDblClick write FOnArrowDblClick;
end;
procedure Register;
implementation
uses ComObj;
procedure TMd4WArrowX.InitControlData;
const
CEventDispIDs: array [0..1] of DWORD = (
$00000001, $00000008);
CLicenseKey: array[0..38] of Word = ( $007B, $0035, $0035, $0035, $0031, $0045, $0042, $0032, $0045, $002D, $0030
, $0041, $0043, $0036, $002D, $0031, $0031, $0044, $0032, $002D, $0042
, $0039, $0046, $0031, $002D, $0030, $0030, $0034, $0038, $0034, $0035
, $0034, $0030, $0030, $0046, $0041, $0041, $007D, $0000);
CControlData: TControlData = (
ClassID: '{5551EB27-0AC6-11D2-B9F1-004845400FAA}';
EventIID: '{5551EB25-0AC6-11D2-B9F1-004845400FAA}';
EventCount: 2;
EventDispIDs: @CEventDispIDs;
LicenseKey: @CLicenseKey;
Flags: $00000008;
Version: 300);
begin
ControlData := @CControlData;
end;
procedure TMd4WArrowX.CreateControl;
procedure DoCreate;
begin
FIntf := IUnknown(OleObject) as IMd4WArrowX;
end;
begin
if FIntf = nil then DoCreate;
end;
function TMd4WArrowX.GetControlInterface: IMd4WArrowX;
begin
CreateControl;
Result := FIntf;
end;
procedure TMd4WArrowX.FlipChildren(AllLevels: WordBool);
begin
ControlInterface.FlipChildren(AllLevels);
end;
function TMd4WArrowX.DrawTextBiDiModeFlags(Flags: Integer; out Value: Integer): Integer;
begin
Result := ControlInterface.DrawTextBiDiModeFlags(Flags);
end;
function TMd4WArrowX.DrawTextBiDiModeFlagsReadingOnly(out Value: Integer): Integer;
begin
Result := ControlInterface.DrawTextBiDiModeFlagsReadingOnly;
end;
function TMd4WArrowX.GetControlsAlignment(out Value: TxAlignment): TxAlignment;
begin
Result := ControlInterface.GetControlsAlignment;
end;
procedure TMd4WArrowX.InitiateAction;
begin
ControlInterface.InitiateAction;
end;
function TMd4WArrowX.IsRightToLeft(out Value: WordBool): WordBool;
begin
Result := ControlInterface.IsRightToLeft;
end;
function TMd4WArrowX.UseRightToLeftAlignment(out Value: WordBool): WordBool;
begin
Result := ControlInterface.UseRightToLeftAlignment;
end;
function TMd4WArrowX.UseRightToLeftReading(out Value: WordBool): WordBool;
begin
Result := ControlInterface.UseRightToLeftReading;
end;
function TMd4WArrowX.UseRightToLeftScrollBar(out Value: WordBool): WordBool;
begin
Result := ControlInterface.UseRightToLeftScrollBar;
end;
function TMd4WArrowX.ClassNameIs(const Name: WideString; out Value: WordBool): WordBool;
begin
Result := ControlInterface.ClassNameIs(Name);
end;
procedure Register;
begin
RegisterComponents('ActiveX',[TMd4WArrowX]);
end;
end.
MD4WARROW.PAS
unit Md4WArrow;
interface
uses
SysUtils, Windows, Messages, Classes,
Graphics, Controls, Forms, Dialogs;
type
TMd4WArrowDir = (adUp, adLeft, adDown, adRight);
TMd4WArrow = class (TCustomControl)
private
fDirection: TMd4WArrowDir;
fArrowHeight: Integer;
fFilled: Boolean;
fPen: TPen;
fBrush: TBrush;
fArrowDblClick: TNotifyEvent;
fArrowPoints: array [0..3] of TPoint;
procedure ComputePoints;
procedure SetDirection (Value: TMd4WArrowDir);
procedure SetArrowHeight (Value: Integer);
procedure SetFilled (Value: Boolean);
procedure SetPen (Value: TPen);
procedure SetBrush (Value: TBrush);
procedure RepaintRequest (Sender: TObject);
procedure WMLButtonDblClk (var Msg: TWMLButtonDblClk);
message wm_LButtonDblClk;
protected
procedure Paint; override;
procedure ArrowDblClick; dynamic;
public
constructor Create (AOwner: TComponent); override;
destructor Destroy; override;
procedure SetBounds (ALeft, ATop, AWidth, AHeight: Integer); override;
published
property Width default 50;
property Height default 20;
property Direction: TMd4WArrowDir
read fDirection write SetDirection default adRight;
property ArrowHeight: Integer
read fArrowHeight write SetArrowHeight default 10;
property Filled: Boolean
read fFilled write SetFilled default False;
property Pen: TPen
read fPen write SetPen;
property Brush: TBrush
read fBrush write SetBrush;
property OnClick;
property OnDragDrop;
property OnDragOver;
property OnEndDrag;
property OnMouseDown;
property OnMouseMove;
property OnMouseUp;
property OnArrowDblClick: TNotifyEvent
read fArrowDblClick write fArrowDblClick;
end;
procedure Register;
implementation
{R ARROW4.DCR}
constructor TMd4WArrow.Create (AOwner: TComponent);
begin
// call the parent constructor
inherited Create (AOwner);
// set the default values
fDirection := adRight;
Width := 50;
Height := 20;
fArrowHeight := 10;
fFilled := False;
// create the pen and the brush
fPen := TPen.Create;
fBrush := TBrush.Create;
// set a handler for the OnChange event
fPen.OnChange := RepaintRequest;
fBrush.OnChange := RepaintRequest;
end;
destructor TMd4WArrow.Destroy;
begin
// delete the two objects
fPen.Free;
fBrush.Free;
// call the parent destructor
inherited Destroy;
end;
procedure TMd4WArrow.SetDirection (Value: TMd4WArrowDir);
begin
if fDirection <> Value then
begin
fDirection := Value;
ComputePoints;
Invalidate;
end;
end;
procedure TMd4WArrow.SetArrowHeight (Value: Integer);
begin
if fArrowHeight <> Value then
begin
fArrowHeight := Value;
ComputePoints;
Invalidate;
end;
end;
procedure TMd4WArrow.SetFilled (Value: Boolean);
begin
if fFilled <> Value then
begin
fFilled := Value;
Invalidate;
end;
end;
procedure TMd4WArrow.SetPen (Value: TPen);
begin
fPen.Assign(Value);
Invalidate;
end;
procedure TMd4WArrow.SetBrush (Value: TBrush);
begin
fBrush.Assign(Value);
Invalidate;
end;
procedure TMd4WArrow.RepaintRequest (Sender: TObject);
begin
Invalidate;
end;
procedure TMd4WArrow.Paint;
var
XCenter, YCenter: Integer;
begin
// compute the center
YCenter := (Height - 1) div 2;
XCenter := (Width - 1) div 2;
// use the current pen and brush
Canvas.Pen := fPen;
Canvas.Brush := fBrush;
// draw the arrow line
case fDirection of
adUp: begin
Canvas.MoveTo (XCenter, Height-1);
Canvas.LineTo (XCenter, fArrowHeight);
end;
adDown: begin
Canvas.MoveTo (XCenter, 0);
Canvas.LineTo (XCenter, Height - 1 - fArrowHeight);
end;
adLeft: begin
Canvas.MoveTo (Width - 1, YCenter);
Canvas.LineTo (fArrowHeight, YCenter);
end;
adRight: begin
Canvas.MoveTo (0, YCenter);
Canvas.LineTo (Width - 1 - fArrowHeight, YCenter);
end;
end;
// draw the arrow head, eventually filling it
if fFilled then
Canvas.Polygon (fArrowPoints)
else
Canvas.PolyLine (fArrowPoints);
end;
procedure TMd4WArrow.ArrowDblClick;
begin
// call the handler, if available
if Assigned (fArrowDblClick) then
fArrowDblClick (self);
end;
procedure Register;
begin
RegisterComponents('Md4', [TMd4WArrow]);
end;
procedure TMd4WArrow.ComputePoints;
var
XCenter, YCenter: Integer;
begin
// compute the points of the arrow head
YCenter := (Height - 1) div 2;
XCenter := (Width - 1) div 2;
// set the points depending on the direction
case fDirection of
adUp: begin
fArrowPoints [0] := Point (0, fArrowHeight);
fArrowPoints [1] := Point (XCenter, 0);
fArrowPoints [2] := Point (Width-1, fArrowHeight);
fArrowPoints [3] := Point (0, fArrowHeight);
end;
adDown: begin
fArrowPoints [0] := Point (XCenter, Height - 1);
fArrowPoints [1] := Point (0, Height - 1 - fArrowHeight);
fArrowPoints [2] := Point (Width - 1, Height - 1 - fArrowHeight);
fArrowPoints [3] := Point (XCenter, Height - 1);
end;
adLeft: begin
fArrowPoints [0] := Point (fArrowHeight, Height - 1);
fArrowPoints [1] := Point (0, YCenter);
fArrowPoints [2] := Point (fArrowHeight, 0);
fArrowPoints [3] := Point (fArrowHeight, Height - 1);
end;
adRight: begin
fArrowPoints [0] := Point (Width - 1 - fArrowHeight, Height - 1);
fArrowPoints [1] := Point (Width - 1 - fArrowHeight, 0);
fArrowPoints [2] := Point (Width - 1, YCenter);
fArrowPoints [3] := Point (Width - 1 - fArrowHeight, Height - 1);
end;
end; // case
end;
procedure TMd4WArrow.SetBounds(ALeft, ATop, AWidth, AHeight: Integer);
begin
inherited SetBounds (ALeft, ATop, AWidth, AHeight);
ComputePoints;
end;
procedure TMd4WArrow.WMLButtonDblClk(var Msg: TWMLButtonDblClk);
var
HRegion: HRgn;
begin
// perform default handling
inherited;
// compute the arrow head region
HRegion := CreatePolygonRgn (
fArrowPoints, 3, WINDING);
try
// check whether the click took place in the region
if PtInRegion (HRegion, Msg.XPos, Msg.YPos) then
ArrowDblClick;
finally
DeleteObject (HRegion);
end;
end;
end.
Copyright Marco Cantù 1998