php-gtk2 Cookbook: How to allow user to adjust volume using GtkVolumeButton - Part 1?

RSS Feed

Google Search

PHP-GTK2 eBooks

Most Recent Reviews

manuphi says: I just want to precise my problem : if I want to post ...
Oct 11, 2008 9:00am
manuphi says: Hi kksou, Sorry for my english langage, cause I'm french... I already use DirectPHP ...
Oct 11, 2008 8:23am
underdpt says: Hello, First, thanks for your site!!! This howto is very good, but it ...
Oct 10, 2008 9:34am
Peter Sutter from Australia says: A very quick response - and with example code. I tried for ...
Oct 8, 2008 4:24am
M Drake says: Not sure I follow. If custom display function means the callback ...
Oct 7, 2008 11:15am
izi rates sample code 1:
Oct 7, 2008 5:48am
M Drake says: Tried several different ways. Current version loops through the data rows, ...
Oct 6, 2008 10:57pm
nexus6it says: clear, simple and powerfull article ...
Oct 6, 2008 7:29am
nexus6it says: have a nice day. in the articles has written: "# Add Trigger for Section ...
Oct 6, 2008 6:06am
M Drake says: Fantastic!!!! I talked to 3 other sites on this one, and ...
Oct 6, 2008 1:28am
RM Flagg says: So far, this was a big help in getting a TM-T88III to ...
Oct 3, 2008 3:13pm

Main Menu

Home

Sample Codes

List all sample codes

Browse all sample codes

Take a break!

Sudoku Joomla Joomla Gadgets Joomla - sample 1 Joomla - sample 2 Joomla 1.0 to 1.5 Google Image Search Google News Search Wikipedia Search Google Book Search Google Video Search Yahoo Stock Quote

PHP-GTK2 Newsletter

PHP-GTK2 Tips & Techniques
FREE Newsletter
by kksou

Your privacy is respected.

Sample Code 498: How to allow user to adjust volume using GtkVolumeButton - Part 1?

Written by kksou

Monday, 26 May 2008

Problem

In the article How to set up volume control - Part 1 - using GtkVScale? we set up a vertical volume control using GtkVScale.

In PHP-GTK v2.0 (which is compiled with gtk+2.12), you can use the new widget called GtkVolumeButton to achieve the same functionality. The user interface is slightly different. It comes in the form of a button. When you click on it, a vertical scale will appear for you to adjust the volume as shown below:

How to allow user to adjust volume using GtkVolumeButton - Part 1?

Note that the range of the volume is between 0.0 and 1.0, with a stepping of 0.02.

Solution

Create a new GtkVolumeButton.
Register the signal 'value-changed' so that you will know the new volume level set by the user.

Important Note: This only works for PHP-GTK v2.0 (or PHP-GTK2 compliled with gtk+ v2.12 and above. If you are using an older version, for linux, you may follow the step-by-step instructions to recompile php-gtk2 with gtk+ v2.12. For windows, please refer to How to install php gtk2 on windows?

Sample Code

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21

<?php
$window = new GtkWindow();
$window->set_title($argv[0]);
$window->set_size_request(400, 160);
$window->connect_simple('destroy', array('Gtk','main_quit'));
$window->add($vbox = new GtkVBox());

// display title
$title = new GtkLabel("Set up Volume Button - Part 1");
$title->modify_font(new PangoFontDescription("Times New Roman Italic 10"));
$title->modify_fg(Gtk::STATE_NORMAL, GdkColor::parse("#0000ff"));
$title->set_size_request(-1, 40);
$vbox->pack_start($title, 0, 0);
$vbox->pack_start(new GtkLabel(), 0, 0);

$vbox->pack_start($hbox = new GtkHBox(), 0);
$hbox->pack_start(new GtkLabel('Click on the button to set the Volume: '), 0);

$vol_button = new GtkVolumeButton(); // note 1
$hbox->pack_start($vol_button, 0);
$vol_button->set_size_request(41, 34);

Note that this is only 70% of the sample code. You have to be a registered member to see the entire sample code. Please login or register.
Registration is free and immediate.
Have some doubt about the registration? Please read this forum article.

Explanation

Create the GtkVolumeButton.
Register the signal value-changed.
Output the new volume value to the command window. Note that the range of the volume is between 0.0 and 1.0, with a stepping of 0.02.

Note

If you run the above script, most likely you will get the following error message in the command window:

(php.exe:4888): Gtk-WARNING **: Could not find the icon 
'audio-volume-muted'. The 'hicolor' theme was not found either, 
perhaps you need to install it.

And the icon doesn't show:

I still have problem setting up the 'hicolor' theme.

Don't worry, in the next article, I will show you how to replace the default icon with our own image.