vb.net qr code open source Note Pure themes (Chameleon) the themes that don t rely on an external theme engine are the in Visual Basic .NET

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exception to the advice of not using the active theme s namespace. If you need to override a theme function and you are using the Chameleon theme, you must use the Chameleon namespace.
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Table 5-3 shows some examples of common themable functions, what they would be named if overridden in the Bluemarine theme, and how they are evoked (parameters omitted). Table 5-3. Examples of Overriding Themable Functions in the Bluemarine Theme
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theme_links() theme_submenu() theme_xml_icon()
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phptemplate_links() phptemplate_submenu() phptemplate_xml_icon()
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theme('links') theme('submenu') theme('xml_icon')
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Exercise 5-1 demonstrates how to override a themable function.
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CHAPTER 5 ADDING AND CUSTOMIZING THEMES
Exercise 5-1. Theme Breadcrumb Links
Try your hand at overriding a themable function for the Bluemarine theme. Create a new file on your web server in the folder themes/bluemarine called template.php. Copy the following short code segment into the template.php file. Don t forget the < php and >. < php function phptemplate_breadcrumb($breadcrumb) { $output = '<h1>Hello World!</h1>'; $output .= implode(' / ', $breadcrumb); return $output; } > In the unaltered Bluemarine theme, breadcrumb links are separated using the character. This is the default HTML that is generated by Drupal. By including the phptemplate_breadcrumb function in the Bluemarine theme, the default HTML will no longer be used; instead, the HTML generated by the new function will be used. The phptemplate_breadcrumb function not only separates the breadcrumb links with a different character, but it also outputs a meaningful and original message directly above them. Click through some pages on your site and you will see the result. You have successfully altered the default HTML for breadcrumbs from this: <div class="breadcrumb"> <a href=" q=" >Home</a> » <a href=" q=node/add" >create content</a> </div> to this: <h1>Hello World!</h1> <a href=" q=" >Home</a> / <a href=" q=node/add" >create content</a>
Using Template Files
In Exercise 5-1, you saw how a function could be written to override a themable function. As useful as this is, generating HTML from within functions can be very tiresome work. PHPTemplate makes the process of creating themable functions much easier and modular by introducing template files. The required file page.tpl.php is one such template file that will be used whenever theme('page') is called. This template must be provided by the theme itself. Other template files are provided by the PHPTemplate engine. These include block.tpl.php, box.tpl.php, comment.tpl.php, and node.tpl.php (see Figure 5-5 earlier in the chapter). These files override the block, box, comment, and node themable functions, respectively. If any of these four files appear in your theme folder alongside page.tpl.php, they will override the version in themes/engines/phptemplate. The template files are completely reusable; you could trade and mix the five standard tpl.php files between themes and expect, at a minimum, that they will be called at the appropriate time. Furthermore, since they are include files and not functions, you can write all the
CHAPTER 5 ADDING AND CUSTOMIZING THEMES
HTML code without needing to worry about escaping quotation marks or concatenating strings a fact that greatly improves the readability of template files over PHP functions that do the same thing.
PHP Code and Templates
If you are a web designer and you ve been given the task of creating a Drupal theme, you need not be scared of the fact that the templates mix PHP and HTML code. Even if you ve never programmed PHP before, the amount of skill and knowledge needed to work with the themes is small enough that you will be able to learn it quickly. Here are some examples of what you might see and explanations of what they do. The first is a simple print construct: < php print $picture > This construct prints the contents of a variable (sends the contents to the browser for display on the screen). In this case, the variable $picture is being printed. The < php and > tags identify the parts that are to be interpreted as PHP and keep the PHP separate from the rest of the template. Here is a conditional print construct: < php print ($sticky) "sticky" : ""; > This is a more elaborate version of the first example, which uses the and : to make a decision. In this case, it can be read if $sticky is set, print the text sticky; otherwise, print nothing (""). The following uses if to make a decision: < php if ($picture): > <br class='clear' /> < php endif; > In this example, the first line asks is $picture true If so, the text <br class='clear' /> will be printed. Note that the opening if statement must be closed by a corresponding endif statement. Finally, this code creates a list: <ul id="primary"> < php foreach ($primary_links as $link): > <li>< php print $link ></li> < php endforeach; > </ul> This example shows how to build an unordered list <ul> with a variable number of list items <li>. It takes the variable $primary_links, which is an array, and uses the foreach operator to go over the array one item at a time, pointing the variable $link to the current item. For each primary link, an <li> element with the link s contents is printed. Notice the endforeach tag, which is needed to close the foreach tag.
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