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Perhaps rather unwisely, I decided to use wxPerl for my final year project. (Having said that, from the tutorial at YAPC::Europe 2001, Tk didn't look like a picnic either!). I started out trying to learn wxPerl by reading Jouke's Perl.com wxPerl tutorial, and that was good--but of course, I need a lot more. The only GUI programming I've done previously is *cough* VB *cough* and suffice it to say, a fully programmatic GUI like wxPerl is hugely different. I've looked at the various wxPerl tutorials on PerlMonks - wxPerl tutorial 3 --, wxPerl Tutorial one :: The basics, and while the former even describes trees (my main problem at the minute), it's not really in the right context.

Anyway, I am creating a music organiser application. The general design is that there will be variable-width "split" at the left hand side of the window which will display the user's music collection as a tree structure. At the minute, my program creates a window, menus and is split into two using Wx::SplitterWindow. Each of the split canvases is a Wx::ScrolledWindow.

Generally, I don't really understand how wxPerl operates. What I understand is that you must, at the very least, extend Wx::Frame and Wx::App and provide an OnInit method for Wx::App. That's fine, I can understand that, and I can understand wx's event model. I can understand creating menus, and that seems relatively straightforward.

What I don't understand is how to create other controls inside the different canvases. When I look at the documentation for the C++ version of wx, I see that when I create a control, I need to specify a parent. As far as I know, this can be any class derived from Wx::Window. However, some of the example wxPerl programs (from which I've learnt most of what I know about wx!) seem to suggest that objects derived from Wx::Window have a method called "add" or similar that can be used to add controls to windows or canvases. However, Wx::ScrolledWindow doesn't seem to support this.

In the code below, when I've created a tree, I've specified $lcanvas, a reference to the left hand canvas, as the parent. If I change this to $self (the window or frame?), the window isn't split properly and only a small rectangular region is displayed. So, my main questions are:

  • How can I add a tree to the left-hand part/canvas of the window?
  • How can I generally add controls to frames?
  • How can I create multiple frames for my application? How can I load and unload them?
#!/usr/bin/perl use strict; use Wx; package MyCanvas; use strict; use vars qw(@ISA); @ISA = qw(Wx::ScrolledWindow); sub new { my( $class ) = shift; my( $this ) = $class->SUPER::new( @_[0,1,2,3], 0, $_[4] ); return $this; } package MusicOrganiserSplitterWindow; use strict; use vars qw(@ISA); @ISA = qw(Wx::SplitterWindow); use Wx qw(:splitterwindow wxDefaultPosition wxDefaultSize); use Wx::Event qw(EVT_SPLITTER_SASH_POS_CHANGED); sub new { my( $class ) = shift; my( $this ) = $class->SUPER::new( @_, wxDefaultPosition, wxDefaultSi +ze, wxSP_3D|wxSP_LIVE_UPDATE ); $this->{FRAME} = $_[0]; return $this; } # Extend Wx's "Frame" class to create the main window. package MusicOrganiserFrame; use base qw(Wx::Frame); use Wx qw(wxOK wxICON_INFORMATION wxDefaultPosition wxDefaultSize); use Wx::Event qw(EVT_MENU); sub new { my $class = shift; my $self = $class->SUPER::new(@_); # Call superclass' constructor # Assign ID values my ($ID_MENU_FILE_REPORT, $ID_MENU_FILE_STATISTICS, $ID_MENU_EDIT_AD +D, $ID_MENU_EDIT_DELETE, $ID_MENU_TOOLS_SETUP, $ID_MENU_HELP_CONTEN +TS, $ID_MENU_HELP_ABOUT, $ID_MENU_FILE_EXIT) = (1 .. 100); # Create menu objects my $file_menu = Wx::Menu->new(); my $tools_menu = Wx::Menu->new(); my $edit_menu = Wx::Menu->new(); my $help_menu = Wx::Menu->new(); # Create File menu $file_menu->Append($ID_MENU_FILE_REPORT, "\&Report\tCtrl+R", "Produce reports about your collection."); $file_menu->Append($ID_MENU_FILE_STATISTICS, "\&Statistics\tCtrl+S", + "Display statistics for part or all of your collection."); $file_menu->AppendSeparator(); $file_menu->Append($ID_MENU_FILE_EXIT, "E\&xit\tCtrl+Q"); # Create Edit menu $edit_menu->Append($ID_MENU_EDIT_ADD, "\&Add volume", "Add a volume to your collection."); $edit_menu->Append($ID_MENU_EDIT_DELETE, "\&Delete volume", "Delete a volume from your collection."); # Create Tools menu $tools_menu->Append($ID_MENU_TOOLS_SETUP, "\&Setup", "Configure Music Organiser."); # Create Help menu $help_menu->Append($ID_MENU_HELP_CONTENTS, "\&Contents"); $help_menu->AppendSeparator(); $help_menu->Append($ID_MENU_HELP_ABOUT, "\&About"); # Create the menu bar that stores all the above menus my $menubar = Wx::MenuBar->new(); $menubar->Append($file_menu, '&File'); $menubar->Append($edit_menu, '&Edit'); $menubar->Append($tools_menu, '&Tools'); $menubar->Append($help_menu, '&Help'); $self->SetMenuBar($menubar); # Set up event handling for menu items. EVT_MENU($self, $ID_MENU_FILE_REPORT, \&OnMenu); # Set window icon $self->SetIcon(Wx::GetWxPerlIcon()); # Create status bar and assign values to the various segments $self->CreateStatusBar(3); $self->SetStatusText("Welcome to Music Organiser!", 1); $self->SetStatusText(scalar(gmtime), 2); my ($splitter) = $self->{SPLITTER} = MusicOrganiserSplitterWindow->new($self, -1); my ($lcanvas) = $self->{LEFTCANVAS} = MyCanvas->new($splitter, -1, [0,0], [400,40 +0], 'Test1'); my ($rcanvas) = $self->{RIGHTCANVAS} = MyCanvas->new($splitter, -1, [0,0], [400,4 +00], 'Test2'); $self->{TREE} = MusicOrganiserTree->new($lcanvas, -1, wxDefaultPosit +ion, wxDefaultSize, wxTR_HAS_BUTTONS); $self->{SPLITTER}->SetMinimumPaneSize(250); $splitter->Initialize($lcanvas); $self->{LEFTCANVAS}->Show( 1 ); $self->{RIGHTCANVAS}->Show( 1 ); $self->{SPLITTER}->SplitVertically( @{$self}{'LEFTCANVAS','RIGHTCANV +AS'} ); $self->{SPLITTER}->SetSashPosition(250,1); return $self; } sub OnMenu { Wx::MessageBox("Menu item selected", "Menu selected", wxOK | wxICON_INFORMATION, $_[0]); } package MusicOrganiserTree; use strict; use base qw(Wx::TreeCtrl); sub new { my $class = shift; my $this = $class->SUPER::new(@_); my $root = $this->AddRoot('Root', -1, -1, Wx::TreeItemData->new('Dat +a')); my $tree_item; $tree_item = $this->AppendItem($root, "Please work", -1, -1, Wx::TreeItemData->new("I really hope this works!")); } package MusicOrganiserApp; use base qw(Wx::App); sub OnInit { my $self = shift; my $frame = MusicOrganiserFrame->new( undef, # Parent window -1, # Window ID 'Music Organiser', # Window title [1, 1], # X, Y position [600, 300] # X, Y size ); $self->SetTopWindow($frame); # Set the top-level window. $frame->Show(1); # Show the frame. } package main; my $app = MusicOrganiserApp->new(); $app->MainLoop;

In reply to WxPerl woes -- putting a Tree into a ScrolledWindow by SuperCruncher

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