MiniChat

This is a charmingly small chat application that demonstrates many concepts, including the use of global events. Start two or more instances to send messages from one instance to the others. The screenshot on the right shows the end result. Below is the full source code of this small application.


<?php

function authorizeLogin( $args, $user, $pass ) {
   return TRUE;
}

function getApplication( $args ) {
   return 'SFMiniChat';
}

class SFMiniChat extends Application
{
    public function init( $event ) {
        $this->window->size( 400, 400 );
        $this->window->title( 'MiniChat' );
        
        // Basic interface construction
        $this->window->addChild(
            $this->messagesBox = new XULScrollBox,
            
            new XULHBox( 'center',
                $this->textBox = new XULTextBox,
                $button = new XULButton( 'Send message' )
            )
        );
        
        // Make the scrollbox stretch, show a scrollbar and
        // distribute its children vertically
        $this->messagesBox
            ->flex(1)
            ->setStyle( 'overflow', 'auto' )
            ->orient( 'vertical' );
        
        // Textbox stretches in the width
        $this->textBox->flex(1);
        
        // Connect the button to the sendText() handler and
        // yield the textbox
        $button->setEvent( 'command', MSG_SEND, $this, 
                    'sendText', $this->textBox );
        
        // Add the promptservice and the return key handler
        $this->window->addChild(
            $this->ps = new PromptService,
            new XULKeySet(
                new XULKey( 'VK_RETURN', '', $this,
                        'sendText', $this->textBox )
            )
        );
        
        // Attach the global event 'message' to the handler
        // $this->receiveText()
        $this->setGlobalEventHandler( 'message', 
                            $this, 'receiveText' );
        
        // Let the promptservice open a prompt for the user's
        // name and have its result handled by the 
        // $this->login() method
        $this->ps->prompt( 'Your name', "What's your name?", 
                    '', $this, 'login' );
    }
    
    // Promptservice handlers always receive the promptservice object
    public function login( $ps ) {
        if( ! $ps->result ) { // User cancelled
            $this->window->close();
            return;
        }
        
        // Save the name
        $this->myName = $ps->value;
        
        // Fire a 'message' global event with the
        // text as first argument
        $this->fireGlobalEvent( 'message',
            $this->myName . ' joined the chat'
        );
    }

    public function sendText( $event ) {
        $text = $this->myName . " says: " . $this->textBox->value();
        // Clear the textbox
        $this->textBox->value('');
        
        // Fire the message global event
        $this->fireGlobalEvent( 'message', $text );
        
        // We don't receive our own messages back so add
        // them separately:
        $this->messagesBox->addChild( new XULDescription($text) );
    }

    public function receiveText( $event, $text ) {
        $this->messagesBox->addChild( new XULDescription($text) );
    }
}

你好!

DavyHo | 02-06-2010 03:53

DavyHo, hello)

asd | 17-02-2011 15:10

Hello!
I want to insert this chat in a php page.
Can you help me?
Thanks.

Dan Gurgui | 11-06-2014 07:12