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If you wanted to have each block on the page have a randomly chosen color, this would be a great opportunity to add the logic for choosing the color. Naturally, you could do this directly in the block.tpl.php file, but that would make the file harder to read for your graphic designer, who doesn t care how you determine the color, only that it is available in a nice, clean variable to be applied inside the template. First, add the following _phptemplate_variables function to the template.php file in your theme. If the template.php file doesn t exist, create it (make sure to begin the file with < php): function _phptemplate_variables($hook, $vars) { switch ($hook) { case 'block': // generate a random color string like #26295d $color = '#'; for ($i = 0; $i < 3; $i++) { $r = dechex(rand(0, 255)); $color .= strlen($r) < 2 '0'.$r : $r; } // add the $color variable to the $vars array $vars['color'] = $color; break; } return $vars; } Next, update the block.tpl.php file in your theme with the following code, which uses the new $color variable to create a border around each block (changes are highlighted): <div class="block block-< php print $block->module; >" id="block-< php print $block->module; >-< php print $block->delta; >" style="border:5px solid < php print $color >;"> <h2 class="title">< php print $block->subject; ></h2> <div class="content">< php print $block->content; ></div> </div> Now when you access your site, every block should have a border with a randomly chosen color.

Now what will happen is that when the Silverlight control is rendered, the code finds the TextBlock element and creates a new event listener that responds to a mouse click by calling the JavaScript function txtClicked. This function will then change the contents of the TextBlock to Hello to you too! the end result being that the text will be changed as soon as the user clicks on it.

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Manipulations at this point in the code are useful mainly for adding decoration or elements that are external to your site s logic. Most of the page execution code has been run by the time _phptemplate_variables gets called, which means it is quite limited in its possibilities. Furthermore, keep in mind that this is the theme for your site, which, by definition, should concern itself exclusively with visual elements and layout. Nevertheless, for tasks like using random colors for blocks, it is a useful place to make customizations.

As you ve seen already, HTML is at the heart of the Silverlight experience. Silverlight is a plug-in for the browser, after all. You ve seen a number of pieces of this HTML already, but for reference, the complete HTML is here. This contains the JavaScript references to the Silverlight.js, CreateSilverlight.js, and Code.js files, which are the Silverlight SDK script, the script containing the createSilverlight function, and the script containing the event-handler code, respectively. It also sets up a <style> tag to define the dimensions of the <div> that contains the Silverlight control, and the <div> itself, which is populated by the results of the call to createSilverlight.

The preceding section demonstrated how to work with the default tpl.php files to modify your theme. Each of these files represents an override to a themable function from the Drupal core. While theme_page, theme_node, theme_comment, theme_box, and theme_block may be the most important themable functions, and thus have the greatest and most direct impact on the appearance of your site, they are by no means the only functions that are available for modification. Core Drupal includes dozens more themable functions, and most contributed modules add to the list as well. Learning how to find and override any themable function you wish is essential to having full mastery over your Drupal site.

<html xmlns="http://www.w3.org/1999/xhtml"> <head> <title>FirstSilverlight</title> <script type="text/javascript" src="Silverlight.js"></script> <script type="text/javascript" src="CreateSilverlight.js"> </script> <script type="text/javascript" src="code.js"> </script> <style type="text/css"> .silverlightHost { height: 480px; width: 640px;

Finding themable functions, at the most basic level, is easy. You just open the code and search for function theme_. Everything that turns up is a themable function and can be overridden. This isn t much consolation, however, when you are looking at your site and you want to change a particular HTML snippet in a particular way. How do you know which themable function is responsible for a given widget or element in your Drupal site Unfortunately, Drupal doesn t provide an easy built-in method for doing this. However, there is an easy way to fix this, and doing so gives you a good opportunity to peer further into the world of Drupal theming. Exercise 5-3 gives you a tool for identifying themable functions.

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