Solved

Tab control with textured background

Posted on 1998-07-03
3
330 Views
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?
0
Comment
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.
0
 

Author Comment

by:bengore
ID: 1357092
Nice solution. How to make a TMapPageControl component of this?
0
 
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 ***
0

Featured Post

6 Surprising Benefits of Threat Intelligence

All sorts of threat intelligence is available on the web. Intelligence you can learn from, and use to anticipate and prepare for future attacks.

Join & Write a Comment

Hello everybody This Article will show you how to validate number with TEdit control, What's the TEdit control? TEdit is a standard Windows edit control on a form, it allows to user to write, read and copy/paste single line of text. Usua…
Introduction Raise your hands if you were as upset with FireMonkey as I was when I discovered that there was no TListview.  I use TListView in almost all of my applications I've written, and I was not going to compromise by resorting to TStringGrid…
This tutorial demonstrates a quick way of adding group price to multiple Magento products.
This video demonstrates how to create an example email signature rule for a department in a company using CodeTwo Exchange Rules. The signature will be inserted beneath users' latest emails in conversations and will be displayed in users' Sent Items…

708 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

15 Experts available now in Live!

Get 1:1 Help Now