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Tab control with textured background

Posted on 1998-07-03
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Last Modified: 2010-04-04
I need a tab control with textured background (PageControl) - where can I find such a component or how to make a  textured tab control?
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Question by:bengore
  • 2
3 Comments
 
LVL 10

Accepted Solution

by:
Jacco earned 200 total points
ID: 1357091
You should derivce a new TTabSheet control.

Here is a sample on how to do it:


*** start of code ***
unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
  ComCtrls, ExtCtrls;

type
  TMapTabSheet = class(TTabSheet)
  private
    FPicture : TImage;
    procedure WMPaint(var msg : TWMPaint); message WM_PAINt;
  protected
  public
    constructor Create(AOwner : TComponent); override;
    destructor Destroy; override;
  published
    property BackGround : TImage read FPicture write FPicture;
  end;

  TForm1 = class(TForm)
    procedure FormCreate(Sender: TObject);
  private
    { Private declarations }
    FControl : TPageControl;
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.DFM}

constructor TMapTabSheet.Create(AOwner : TComponent);
begin
  inherited Create(AOwner);
  FPicture:=TImage.Create(Self);
end;

destructor TMapTabSheet.Destroy;
begin
  FPicture.Free;
  inherited Destroy;
end;

procedure TMapTabSheet.WMPaint(var msg : TWMPaint);
var
  Canvas : TCanvas;
  i,j : Integer;
begin
  inherited;
  Canvas := TCanvas.Create;
  Canvas.Handle := GetDC(Handle);
  with Canvas do begin
    for i:=0 to Width div FPicture.Picture.Width do
      for j:=0 to Height div FPicture.Picture.Height do
        Draw(i*FPicture.Picture.Width,j*FPicture.Picture.Height,FPicture.Picture.Bitmap);
  end;
  Canvas.Free;
end;

procedure TForm1.FormCreate(Sender: TObject);
begin
  FControl := TPageControl.Create(Self);
  with FControl do begin
    Parent := Self;
    Align := alClient;
    with TMapTabSheet.Create(Self) do begin
      PageControl := FControl;
      Caption := 'One';
      BackGround.Picture.LoadFromFile('c:\program files\borland\delphi 3\images\splash\256color\finance.bmp');
    end;
    with TMapTabSheet.Create(Self) do begin
      PageControl := FControl;
      Caption := 'Two';
      BackGround.Picture.LoadFromFile('c:\program files\borland\delphi 3\images\splash\256color\shipping.bmp');
    end;
  end;
end;

end.

*** end of code ***

Regards Jacco.
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Author Comment

by:bengore
ID: 1357092
Nice solution. How to make a TMapPageControl component of this?
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LVL 10

Expert Comment

by:Jacco
ID: 1357093
You need to derive a new class from TPageControl and a new TComponentEditor.

I show the code below.

The BackGround property changed from TImage to TPicture. And it needed a SetBackGround method  for assigning.

The TMapPageControl only has an override of the property Pages and a GetMapTabSheet function. (It uses the inherited Pages property so you don't have to rewrite a lot of code).

Good luck

Don't you love component design !

Regards Jacco

Notes:
- Pay attention to the initialization section.
- RegisterNoIcon for the TMapTabSheet
- The component editor is Registered for both the TMapTabSheet and the TMapPageControl (so that the right mouse click works anywhere)

*** start of code ***
unit UMapPageControl;

interface

uses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
  ComCtrls, ExtCtrls, DsgnIntf;

type
  TMapTabSheet = class(TTabSheet)
  private
    FPicture : TPicture;
    procedure WMPaint(var msg : TWMPaint); message WM_PAINt;
    procedure SetBackGround(Value : TPicture);
  protected
  public
    constructor Create(AOwner : TComponent); override;
    destructor Destroy; override;
  published
    property BackGround : TPicture read FPicture write SetBackGround;
  end;

  TMapPageControl = class(TPageControl)
  private
    function GetMapTabSheet(Index : Integer) : TMapTabSheet;
  public
    property Pages[Index : Integer] : TMapTabSheet read GetMapTabSheet;
  end;

  TMapPageControlEditor = class(TComponentEditor)
  public
    function GetVerbCount : Integer; override;
    function GetVerb(i : Integer) : String; override;
    procedure ExecuteVerb(i : Integer); override;
  end;

procedure Register;

implementation

// Register

procedure Register;
begin
  RegisterComponents('Jacco',[TMapPageControl]);
  RegisterComponentEditor(TMapPageControl,TMapPageControlEditor);
  RegisterComponentEditor(TMapTabSheet,TMapPageControlEditor);
  RegisterNoIcon([TMapTabSheet]);
end;

// TMapTabSheet

constructor TMapTabSheet.Create(AOwner : TComponent);
begin
  inherited Create(AOwner);
  FPicture:=TPicture.Create;
end;

destructor TMapTabSheet.Destroy;
begin
  FPicture.Free;
  inherited Destroy;
end;

procedure TMapTabSheet.SetBackGround(Value: TPicture);
begin
  FPicture.Assign(Value);
end;

procedure TMapTabSheet.WMPaint(var msg : TWMPaint);
var
  Canvas : TCanvas;
  i,j : Integer;
begin
  inherited;
  if Assigned(FPicture) then begin
    if (FPicture.Width<>0) and (FPicture.Height<>0) then begin
      Canvas := TCanvas.Create;
      Canvas.Handle := GetDC(Handle);
      with Canvas do begin
        for i:=0 to Width div FPicture.Width do
          for j:=0 to Height div FPicture.Height do
            Draw(i*FPicture.Width,j*FPicture.Height,FPicture.Bitmap);
      end;
      Canvas.Free;
    end;
  end;
end;

// TMapPageControl

function TMapPageControl.GetMapTabSheet(Index : Integer) : TMapTabSheet;
begin
  Result := TMapTabSheet(inherited Pages[Index]);
end;

// TMapPageControlEditor

function TMapPageControlEditor.GetVerbCount : Integer;
begin
  Result := 3;
end;

function TMapPageControlEditor.GetVerb(i : Integer) : String;
begin
  case i of
    0 : Result := 'New page';
    1 : Result := 'Next page';
    2 : Result := 'Previous page';
  end;
end;

procedure TMapPageControlEditor.ExecuteVerb(i : Integer);
var
  MapTabSheet : TMapTabSheet;
  MapPageControl : TMapPageControl;
  sName : String;
  iName : Integer;
begin
  if Component is TMapTabSheet then
    MapPageControl := TMapPageControl(TMapTabSheet(Component).PageControl)
  else
    MapPageControl := TMapPageControl(Component);
  case i of
    0 : begin
      MapTabSheet := TMapTabSheet.Create(Component.Owner);
      sName := 'TabSheet';
      iName := 1;
      while MapPageControl.Owner.FindComponent(sName+IntToStr(iName))<>nil do
        Inc(iName);
      MapTabSheet.Name:=sName + IntToStr(iName);
      MapTabSheet.PageControl := MapPageControl;
    end;
    1 : TMapPageControl(Component).SelectNextPage(True);
    2 : TMapPageControl(Component).SelectNextPage(False);
  end;
end;

initialization
  RegisterClasses([TMapTabSheet]);
end.
*** end of code ***
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