?
Solved

Disable pages in TPagecontrol

Posted on 2001-06-05
4
Medium Priority
?
533 Views
Last Modified: 2011-09-20
Hi,
How to disable the  pages in TpageControl,i.e., when the pages are disabled (tabsheet.enabled = False), the tab text should be grayed out and the tabs (disabled pages) cannot be clicked.  

Thanks.
0
Comment
Question by:llkhor
  • 2
4 Comments
 
LVL 13

Expert Comment

by:Epsylon
ID: 6155475
You could set TabVisible to false instead...
0
 

Author Comment

by:llkhor
ID: 6158273
Epsylon : I want the disabled pages (Tabs) to be visible, if i set Tabvisible to False, this will hide the pages completely.  

Thanks.
0
 
LVL 17

Accepted Solution

by:
inthe earned 150 total points
ID: 6158789
hi,
you could use a component like this (you may want to modify the text colors a bit but it disables the pages from being clicked)


unit PBPageControl;

interface

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

type
  TPBPageControl = class(TPageControl)
  private
    { Private declarations }
    Procedure WMLButtonDown( Var msg: TWMLButtonDown ); message
WM_LBUTTONDOWN;
    Procedure CMDialogKey( Var msg: TWMKey ); message CM_DIALOGKEY;
    procedure SetOwnerdraw(const Value: Boolean);
    function GetOwnerdraw: Boolean;
  protected
    { Protected declarations }
    procedure DrawTab(TabIndex: Integer; const Rect: TRect; Active: Boolean);
override;
  public
    { Public declarations }
    Constructor Create( aOwner: TCOmponent ); override;
  published
    { Published declarations }
    property Ownerdraw: Boolean read GetOwnerdraw write SetOwnerdraw default
True;
  end;

procedure Register;

implementation

Uses CommCtrl;

procedure Register;
begin
  RegisterComponents('PBGoodies', [TPBPageControl]);
end;

{ TPBPageControl }

procedure TPBPageControl.CMDialogKey(var msg: TWMKEY);
var
  thistab, tab: TTabSheet;
  forward: Boolean;
begin
  If (msg.CharCode = Ord(#9)) and (GetKeyState( VK_CONTROL ) < 0) Then
  Begin
    thistab := ActivePage;
    forward := GetKeyState( VK_SHIFT ) >= 0;
    tab := thistab;
    Repeat
      tab := FindNextPage( tab, forward, true );
    Until tab.Enabled or (tab = thistab);
    If tab <> thistab Then Begin
      If CanChange Then Begin
        ActivePage := tab;
        Change;
      End;
      Exit;
    End;
  End;
  inherited;
end;

constructor TPBPageControl.Create(aOwner: TCOmponent);
begin
  inherited;
  OwnerDraw := True;
end;

procedure TPBPageControl.DrawTab(TabIndex: Integer; const Rect: TRect;
  Active: Boolean);
var
  imageindex: Integer;
  r: TRect;
  S: String;
begin
  If not Pages[TabIndex].Enabled Then
    Canvas.Font.Color := clInactiveCaptionText;
  If Active Then
    Canvas.Font.Style := [fsBold];  
  If Assigned( OnDrawTab ) Then
    inherited
  Else Begin
    r:= Rect;
    Canvas.Fillrect( r );
    imageindex := GetImageIndex( tabindex );
    If (imageindex >=0) and Assigned( Images ) Then Begin
      SaveDC( canvas.handle );
      images.Draw( Canvas, Rect.Left+4, Rect.Top+2,
                   imageindex,
                   Pages[TabIndex].enabled );
      // images.draw fouls the canvas colors if it draws
      // the image disabled, thus the SaveDC/RestoreDC
      RestoreDC( canvas.handle, -1 );            
      R.Left := R.Left + images.Width + 4;
    End;
    S:= Pages[ TabIndex ].Caption;
    InflateRect( r, -2, -2 );
    DrawText( Canvas.handle,
              PChar(S),
              Length(S),
              r,
              DT_SINGLELINE or DT_LEFT or DT_TOP );
  End;
end;

function TPBPageControl.GetOwnerdraw: Boolean;
begin
  result := inherited OwnerDraw;
end;

procedure TPBPageControl.SetOwnerdraw(const Value: Boolean);
begin
  inherited OwnerDraw := true;
end;

procedure TPBPageControl.WMLButtonDown(var msg: TWMLButtonDown);
var
  hi: TTCHitTestInfo;
  tabindex: Integer;
begin
  If csDesigning In ComponentState Then Begin
    inherited;
    Exit;
  End;
  hi.pt.x := msg.XPos;
  hi.pt.y := msg.YPos;
  hi.flags := 0;
  tabindex := Perform( TCM_HITTEST, 0, longint(@hi));
  If (tabindex >= 0) and ((hi.flags and TCHT_ONITEM) <> 0)
  Then
    If not Pages[ tabindex ].Enabled Then Begin
      msg.result := 0;
      Exit;
    End;
  inherited;
end;

end.
0
 

Author Comment

by:llkhor
ID: 6175929
Thanks ....
0

Featured Post

Free Tool: Subnet Calculator

The subnet calculator helps you design networks by taking an IP address and network mask and returning information such as network, broadcast address, and host range.

One of a set of tools we're offering as a way of saying thank you for being a part of the community.

Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.

Join & Write a Comment

Introduction I have seen many questions in this Delphi topic area where queries in threads are needed or suggested. I know bumped into a similar need. This article will address some of the concepts when dealing with a multithreaded delphi database…
In my programming career I have only very rarely run into situations where operator overloading would be of any use in my work.  Normally those situations involved math with either overly large numbers (hundreds of thousands of digits or accuracy re…
If you are looking for an automated solution for backup single or multiple Office 365 user mailboxes to Outlook data file, then you can use Kernel Office 365 Backup & Restore tool. Go through the video to check out the steps to backup single or mult…
If you are looking for an automated tool which can generate reports for Outlook emails and other items from PST file, then you can go for Kernel PST Reporter tool. The reports which are created by this tool are helpful to analyze and understand PST …

568 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