Hi there.

I'm trying to write a MDI application in Lazarus (Win32/Vista, Lazarus 0.9.31).

I created the main form and set its FormStyle property to fsMDIForm. Then I created the child form and set its FormsStyle to fsMDIChild.

I also created a menu where I can start a new form. I moved the child form the non-automatic-created form list. And used the following code to create it:

-----------------
procedure TfrmMain.mnuEntrarDadosClick(Sender: TObject);
var frmChild: TfrmRelatVend;
begin
    frmChild := TfrmRelatVend.Create(self);
    frmChild.Show;
end;
-----------------
I also wrote a formClose handler for the child so it gets freed when I close
it.
-----------------
procedure TfrmRelatVend.FormClose(Sender: TObject;
    var CloseAction: TCloseAction);
begin
    CloseAction := caFree;
end;
-----------------

Altough the form gets created and shows up, it does not have a MDI behavior, eg, it does not "stay" in the limits of its parent form and it gets maximized on top of its parent form.

What am I doing wrong?

thank you

Hi Daniel,

Date: Sat, 2 Apr 2011 19:02:46 -0300
From:
To:
Subject: [Lazarus] MDI implementation

Hi there.

I'm trying to write a MDI application in Lazarus (Win32/Vista, Lazarus 0.9.31).

I created the main form and set its FormStyle property to fsMDIForm. Then I created the child form and set its FormsStyle to fsMDIChild.

I also created a menu where I can start a new form. I moved the child form the non-automatic-created form list. And used the following code to create it:

-----------------
procedure TfrmMain.mnuEntrarDadosClick(Sender: TObject);
var frmChild: TfrmRelatVend;
begin
    frmChild := TfrmRelatVend.Create(self);
    frmChild.Show;
end;
-----------------

I also wrote a formClose handler for the child so it gets freed when I close it.

-----------------
procedure TfrmRelatVend.FormClose(Sender: TObject;
    var CloseAction: TCloseAction);
begin
    CloseAction := caFree;
end;
-----------------

Altough the form gets created and shows up, it does not have a MDI behavior, eg, it does not "stay" in the limits of its parent form and it gets maximized on top of its parent form.

What am I doing wrong? thank you

I cannot tell you exactly what you're doing wrong, but I can do the next best thing. I have a Simple_Ed (simple text editor) which supports unlimited MDI child text windows working. You can find it here:
https://sites.google.com/site/pewtas/home/delphi_source_code and the download for the Delphi 7 source code is here: simple_ed_005_src.zip 19 KB - The Delphi source code files only

(Note that this has a main form and a child MDI form). Best Regards,Peter / pew

Quoting Daniel Franzini :

Hi there. I'm trying to write a MDI application in Lazarus (Win32/Vista, Lazarus 0.9.31).

MDI isn't yet supported on lazarus, but will be available soon. You can see progres at my todo list.
http://wiki.lazarus.freepascal.org/User:Zeljan
There are also some mdi screenshoots.

zeljko

Thank you, Peter.

I already tried in Delphi and it works fine. I wanted to do this in Lazarus because I intended it to work in Linux too.

But thanks anyway for the tip and the code.

2011/4/2 Peter Williams

Hi Daniel,

Date: Sun, 3 Apr 2011 10:28:07 -0300
From:
To:
Subject: Re: [Lazarus] MDI implementation

I found that my Delphi code does not compile in Lazarus for MDI forms. http://wiki.lazarus.freepascal.org/MultiDoc
MultiDoc is the Lazarus version of MDI forms.
http://sourceforge.net/projects/lazarus-ccr/files/MultiDoc/MultiDoc%200.2/multidoc-0.2.zip/download I installed it and ran the demo and found that when I have some child forms, when I close one of the forms I get an EAccess violation error (216) exception. Does anyone know how we can get rid of this AV error ??? Note the component is dated 2007-01-06 and version 0.2. Best Regards,Peter / pew

2011/4/2 Peter Williams

Hi Daniel,

Date: Sat, 2 Apr 2011 19:02:46 -0300
From:
To:

Subject: [Lazarus] MDI implementation

Hi there.

I'm trying to write a MDI application in Lazarus (Win32/Vista, Lazarus 0.9.31).

I created the main form and set its FormStyle property to fsMDIForm. Then I created the child form and set its FormsStyle to fsMDIChild.

I also created a menu where I can start a new form. I moved the child form the non-automatic-created form list. And used the following code to create it:

-----------------
procedure TfrmMain.mnuEntrarDadosClick(Sender: TObject);
var frmChild: TfrmRelatVend;
begin
    frmChild := TfrmRelatVend.Create(self);
    frmChild.Show;
end;
-----------------

I also wrote a formClose handler for the child so it gets freed when I close it.

-----------------
procedure TfrmRelatVend.FormClose(Sender: TObject;
    var CloseAction: TCloseAction);
begin
    CloseAction := caFree;
end;
-----------------

Altough the form gets created and shows up, it does not have a MDI behavior, eg, it does not "stay" in the limits of its parent form and it gets maximized on top of its parent form.

What am I doing wrong? thank you

I cannot tell you exactly what you're doing wrong, but I can do the next best thing. I have a Simple_Ed (simple text editor) which supports unlimited MDI child text windows working.

You can find it here:
https://sites.google.com/site/pewtas/home/delphi_source_code

and the download for the Delphi 7 source code is here: simple_ed_005_src.zip 19 KB - The Delphi source code files only

(Note that this has a main form and a child MDI form). Best Regards,Peter / pew

Hi Peter.

I found this version to be newer.

http://www.oocities.org/br/hipernetjr/lmdi/index_en.html

It seems to work well, but needs further testing.

2011/4/3 Peter Williams

Hi Daniel,
I am getting now an error with the new version. I try to install it and it comes back with cannot find package LMDI (or possibly graph). Best Regards,Peter / pew

Date: Sun, 3 Apr 2011 14:17:18 -0300
From:
To:
Subject: Re: [Lazarus] MDI implementation

Hi Peter.

I found this version to be newer.

http://www.oocities.org/br/hipernetjr/lmdi/index_en.html

It seems to work well, but needs further testing.

2011/4/3 Peter Williams

Hi Daniel,

Date: Sun, 3 Apr 2011 10:28:07 -0300
From:
To:

Subject: Re: [Lazarus] MDI implementation

Thank you, Peter. I already tried in Delphi and it works fine. I wanted to do this in Lazarus because I intended it to work in Linux too.

But thanks anyway for the tip and the code.

I found that my Delphi code does not compile in Lazarus for MDI forms. http://wiki.lazarus.freepascal.org/MultiDoc

MultiDoc is the Lazarus version of MDI forms.
http://sourceforge.net/projects/lazarus-ccr/files/MultiDoc/MultiDoc%200.2/multidoc-0.2.zip/download

I installed it and ran the demo and found that when I have some child forms, when I close one of the forms I get an EAccess violation error (216) exception. Does anyone know how we can get rid of this AV error ???

Note the component is dated 2007-01-06 and version 0.2. Best Regards,Peter / pew

2011/4/2 Peter Williams

Hi Daniel,

Date: Sat, 2 Apr 2011 19:02:46 -0300
From:
To:

Subject: [Lazarus] MDI implementation

Hi there.

I'm trying to write a MDI application in Lazarus (Win32/Vista, Lazarus 0.9.31).

I created the main form and set its FormStyle property to fsMDIForm. Then I created the child form and set its FormsStyle to fsMDIChild.

I also created a menu where I can start a new form. I moved the child form the non-automatic-created form list. And used the following code to create it:

-----------------
procedure TfrmMain.mnuEntrarDadosClick(Sender: TObject);
var frmChild: TfrmRelatVend;
begin
    frmChild := TfrmRelatVend.Create(self);
    frmChild.Show;
end;
-----------------

I also wrote a formClose handler for the child so it gets freed when I close it.

-----------------
procedure TfrmRelatVend.FormClose(Sender: TObject;
    var CloseAction: TCloseAction);
begin
    CloseAction := caFree;
end;
-----------------

Altough the form gets created and shows up, it does not have a MDI behavior, eg, it does not "stay" in the limits of its parent form and it gets maximized on top of its parent form.

What am I doing wrong? thank you

I cannot tell you exactly what you're doing wrong, but I can do the next best thing. I have a Simple_Ed (simple text editor) which supports unlimited MDI child text windows working.

You can find it here:
https://sites.google.com/site/pewtas/home/delphi_source_code

and the download for the Delphi 7 source code is here: simple_ed_005_src.zip 19 KB - The Delphi source code files only

(Note that this has a main form and a child MDI form). Best Regards,Peter / pew

Hi,

You can get the last version for Multidoc from the svn for my skychart application,
see http://wiki.lazarus.freepascal.org/MultiDoc
It work with Lazarus 0.9.30 and svn trunk.

But the zeljko way look much better, so I eagerly await I can trash it :-)

Patrick

Maybe i'll say a pile of bullshit, but: Could contraints solve this problem as a workaround?
________________________________
William de Oliveira Ferreira
Bacharel em Sistemas de Informa??o

2011/4/4 Patrick Chevalley :