20 September, 2008

Flex - autoscrolable text area

Need TextArea with automatic scrolling to bottom?
This is not trivial, but simple:

package emc.components {
import mx.controls.TextArea;

public class AutoScrollableTextArea extends TextArea {
override protected function updateDisplayList(unscaledWidth:Number, unscaledHeight:Number):void
super.updateDisplayList(unscaledWidth, unscaledHeight);
verticalScrollPosition = textField.numLines;

For example, it is useful for outputting log information.

18 September, 2008

PHP - roots list

Unfortunately, I don't know another way how to resolve all roots (drives) under Windows:
public function getRoots() {
$roots = array();
for ($i='A'; $i<'Z'; $i++) {
if (is_dir($disk) && is_readable($disk))
$roots[] = $disk;
return $roots;

Somebody know?

Namespaces for custom Flex components

Flex (MXML) allow to declare custom components via xmlns declaration.
Like this:
<mx:Box xmlns:mx="http://www.adobe.com/2006/mxml"

This way is useful when amount of custom components not too much and all components are located in the one or two packages.

But what about real namespaces like in Flex itself ("xmlns:mx="http://www.adobe.com/2006/mxml"); for huge amount of components?

It is possible to consolidate declaration of all components in the single file.
Like this:

<?xml version="1.0"?>

<component id="Navigator" class="emc.components.navigator.Navigator"/>
<component id="Editor" class="emc.components.editor.Editor"/>
<component id="Console" class="emc.components.console.Console"/>
<component id="SmartTruncableLabel" class="emc.components.SmartTruncableLabel"/>
<component id="AutoScrollableTextArea" class="emc.components.AutoScrollableTextArea"/>
put this file into the project sources directory and add this argument to the MXML compiler:
and then use this components in the MXML files via this declaration:
<mx:Box xmlns:mx="http://www.adobe.com/2006/mxml"
and insert component into your application:
<emc:SmartTruncableLabel id="titleLabel" styleName="filePanelTitleLabel" width="100%" />

How do you like it?

Simple URL rewrite rule for Apache

These strings in the ".htaccess" file redirect HTTP query from "worker.xml" file to "worker.php":
RewriteEngine on
RewriteBase /worker
RewriteRule worker.xml worker.php

So, it is possible to create XML (or another) facade around PHP (or another) server-side implementation.

Enable Flex trace logging

Just create "C:\Documents and Settings\{UserName}\mm.cfg" file
with this content:
and you will see Flex trace output in the "C:\Documents and Settings\{UserName}\Application Data\Macromedia\Flash Player\Logs\" directory.

PHP - exec output

This is the simple way how to capture exec output:

function execOutput($command) {
$output = array($command);
exec($command.' 2>&1', $output);
return implode("\n", $output);

echo execOutput('help');