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Jeremy O'Donoghue | 1 Dec 2009 14:17
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Re: Changing a label depending on real world data

This sounds as though it may be 'homework', so hints only - your
professor
may well be reading in any case. Please see
http://www.haskell.org/haskellwiki/Homework_help
for more information.

- To make something happen when you press a button, you need to add an
event
  handler to the button.
- One way of doing this in wxHaskell is to reference the event handler
in
  the button attributes when you create it.
- Your event handler needs to be able to identify the text label so that
it
  can update it with new contents.

Almost all functions in wxHaskell run in the IO monad, as you have
observed.
While you cannot 'take away' the IO, you can use values which are
embedded
with an IO type, for example, suppose you have a function (these are
deliberately not quite the same as the 'real' wxHaskell functions, but
should give you an idea):

button :: Window -> [Attribute] -> IO Button
frame  :: Maybe Window -> [Attribute] -> IO Frame

You can create a button in a frame with code something like the
following:
(Continue reading)

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carlos gomez | 23 Dec 2009 01:41
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scrolledWindow

Hi all


I am trying to use scrolled windows with wxhaskell, but it doesn't work,

Am I doing rightly?

here is the code:
----------------------------------------------------
module Gui where

import Graphics.UI.WXCore
import Graphics.UI.WX

main :: IO ()
main = start gui

gui :: IO ()
gui = do f   <- frame   [text := "Frame"]
         pnl <- scrolledWindow f [scrollRate := sz 20 20]
         sal <- staticText pnl [text := "This is an example of using an scroll bar with wxhaskell, it looks like don't work, so it's true?"]
         set pnl [layout := widget sal]
         set f  [layout := column 5 [widget pnl]]
         return ()
----------------------------------------------------

--carlos
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Jeremy O'Donoghue | 23 Dec 2009 17:34
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Re: scrolledWindow

Hi Carlos,
 
I assume from the posted code that what you really want is a StaticText widget with a scroll bar, and that you wish to 'force' the scroll bar to be present at all times (default behaviour of all widgets is that scroll bars appear only when they are needed).
 
The code I have just tested to do this is:
 
module Main where

import Data.Bits
import Graphics.UI.WXCore
import Graphics.UI.WX

main :: IO ()
main = start gui

gui :: IO ()
gui = do f   <- frame   [text := "Frame"]
         tcl <- textCtrl f [text := "This is an example of using an scroll bar with wxhaskell, it looks like don't work, so it's true?",
                            style := wxTE_READONLY .|. wxHSCROLL .|. wxVSCROLL]
         set f  [layout := fill $ widget tcl, clientSize := sz 200 200]
         return ()
 
Compared to your code, there are a few differences:
 
It is sufficient, for simple cases, to simply set the wxHSCROLL and/or wxVSCROLL style on most windows if you want them to have permanent scroll bars. The wxTE_READONLY style replicates a StaticText (i.e. it sets text control to be read only) but with multiple lines. If you just want a single line, StaticText can be used instead.
 
You should set a clientSize on the parent frame - if you do not, all widgets will be fittedt to their minimum possible size. The use of the fill combinator in the layout indicates that I want the TextCtrl to fit the whole of the allocated space.
 
Hope this helps.
 
Best regards
Jeremy
 
On Tue, 22 Dec 2009 20:41 -0400, "carlos gomez" <carliros.g-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
Hi all
 
I am trying to use scrolled windows with wxhaskell, but it doesn't work,
 
Am I doing rightly?
 
here is the code:
----------------------------------------------------
module Gui where
 
import Graphics.UI.WXCore
import Graphics.UI.WX
 
main :: IO ()
main = start gui
 
gui :: IO ()
gui = do f   <- frame   [text := "Frame"]
         pnl <- scrolledWindow f [scrollRate := sz 20 20]
         sal <- staticText pnl [text := "This is an example of using an scroll bar with wxhaskell, it looks like don't work, so it's true?"]
         set pnl [layout := widget sal]
         set f  [layout := column 5 [widget pnl]]
         return ()
----------------------------------------------------
 
--carlos
-- Jeremy O'Donoghue jeremy.odonoghue-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org 
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carlos gomez | 26 Dec 2009 04:15
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Re: scrolledWindow

The example you put is good, but it is not what I want.

I want to use the scroll bar of a window (like panel or scrolledwindow), and move the scroll bar to see the parts not visible of elements that can contain the panel.
In your example, every textCtrl could have his own scroll bar, but I want only one for all elements, and it have to be in the panel container of the elements.

As I read in wxwidget, an easy and automatic way to configure the scroll bar in a scrolledWindow is using scrollRate. Then the scrolledWindow will use the Sizer (Layout in wxHaskell) to set the virtualSize and the clientSize of the panel to set the pageSize of the scrolledWindow. 

I wrote an example in wxwidget, and the same example in wxhaskell didn't work. I wonder why didn't work and how can i fix.

-----------------------------------------------------------
#include <wx/wx.h>
#include <wx/wxhtml.h>
#include <wx/scrolwin.h>

class MyApp: public wxApp 
{
    virtual bool OnInit();
};

class MyFrame: public wxFrame 
{
public:
    MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size);
};

IMPLEMENT_APP(MyApp)

bool MyApp::OnInit() 
{
    MyFrame *frame = new MyFrame( _("Hello World"), wxPoint(50, 50), wxSize(450, 340) );
    frame->Show(true);
    SetTopWindow(frame);
    return true;
}

MyFrame::MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size)
       : wxFrame(NULL, -1, title, pos, size)
{

    wxScrolledWindow* scrolledWindow = new wxScrolledWindow (
            this, wxID_ANY, wxPoint (0, 0), wxSize (400, 400),
            wxVSCROLL | wxHSCROLL);
    
    //scrolledWindow->SetScrollbars(20, 20, 200, 200);

    scrolledWindow->SetScrollRate(10, 10);

    wxStaticText* staticText1 = new wxStaticText(
        scrolledWindow, 
        wxID_STATIC, 
        wxT("This is an example to verify the functionality of scrolledWindow in wxwidget, so let's go to see what's going on!!!!."), 
        wxDefaultPosition,
        wxDefaultSize, 
        wxALIGN_LEFT);
    
    wxStaticText* staticText2 = new wxStaticText(
        scrolledWindow, 
        wxID_STATIC, 
        wxT("staticText 2."), 
        wxDefaultPosition,
        wxDefaultSize, 
        wxALIGN_LEFT);
    

    wxBoxSizer *topSizerSW = new wxBoxSizer (wxVERTICAL);
    topSizerSW->Add(staticText1, 1, wxEXPAND | wxALL, 10);
    topSizerSW->Add(staticText2, 1, wxEXPAND | wxALL, 10);

    scrolledWindow->SetSizer(topSizerSW);

}
---------------------------------------------------------

---------------------------------------------------------
module Main where

import Graphics.UI.WXCore
import Graphics.UI.WX
import Data.Bits

main :: IO()
main = start gui

gui :: IO()
gui = do f  <- frame [text := "Frame"]
         sw <- scrolledWindow f [ scrollRate := sz 10 10
                                           , style      := wxVSCROLL .|. wxHSCROLL
                                           ]
         st1 <- staticText sw [text := "This is an example to verify the functionality of scrolledWindow in wxwidget, so let's go to see what's going on!!!!."]
         st2 <- staticText sw [text := "staticText 2."]
         set sw [layout := column 5 [ expand $ widget st1
                                                , expand $ widget st2
                                                 ]
                    ]
         set f [layout := fill $ widget sw]
         return ()

---------------------------------------------------------

2009/12/23 Jeremy O'Donoghue <jeremy.odonoghue-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Hi Carlos,
 
I assume from the posted code that what you really want is a StaticText widget with a scroll bar, and that you wish to 'force' the scroll bar to be present at all times (default behaviour of all widgets is that scroll bars appear only when they are needed).
 
The code I have just tested to do this is:
 
module Main where

import Data.Bits

import Graphics.UI.WXCore
import Graphics.UI.WX

main :: IO ()
main = start gui

gui :: IO ()
gui = do f   <- frame   [text := "Frame"]
         tcl <- textCtrl f [text := "This is an example of using an scroll bar with wxhaskell, it looks like don't work, so it's true?",
                            style := wxTE_READONLY .|. wxHSCROLL .|. wxVSCROLL]
         set f  [layout := fill $ widget tcl, clientSize := sz 200 200]
         return ()
 
Compared to your code, there are a few differences:
 
It is sufficient, for simple cases, to simply set the wxHSCROLL and/or wxVSCROLL style on most windows if you want them to have permanent scroll bars. The wxTE_READONLY style replicates a StaticText (i.e. it sets text control to be read only) but with multiple lines. If you just want a single line, StaticText can be used instead.
 
You should set a clientSize on the parent frame - if you do not, all widgets will be fittedt to their minimum possible size. The use of the fill combinator in the layout indicates that I want the TextCtrl to fit the whole of the allocated space.
 
Hope this helps.
 
Best regards
Jeremy
 
On Tue, 22 Dec 2009 20:41 -0400, "carlos gomez" <carliros.g-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
Hi all
 
I am trying to use scrolled windows with wxhaskell, but it doesn't work,
 
Am I doing rightly?
 
here is the code:
----------------------------------------------------
module Gui where
 
import Graphics.UI.WXCore
import Graphics.UI.WX
 
main :: IO ()
main = start gui
 
gui :: IO ()
gui = do f   <- frame   [text := "Frame"]
         pnl <- scrolledWindow f [scrollRate := sz 20 20]
         sal <- staticText pnl [text := "This is an example of using an scroll bar with wxhaskell, it looks like don't work, so it's true?"]
         set pnl [layout := widget sal]
         set f  [layout := column 5 [widget pnl]]
         return ()
----------------------------------------------------
 
--carlos
-- Jeremy O'Donoghue jeremy.odonoghue-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org 

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Join now and get one step closer to millions of Verizon customers
http://p.sf.net/sfu/verizon-dev2dev 
------------------------------------------------------------------------------
This SF.Net email is sponsored by the Verizon Developer Community
Take advantage of Verizon's best-in-class app development support
A streamlined, 14 day to market process makes app distribution fast and easy
Join now and get one step closer to millions of Verizon customers
http://p.sf.net/sfu/verizon-dev2dev
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