2

When I am logged in, there is a gray admin bar on top. My theme layout got distorted by the bar. How to solve the layout problem? Is there a function that can detect user is logged in or not, or use CSS can solve the problem ?

The theme demo is at: http://raptor.hk/dev/theme and below is the screenshot when the gray bar is there.

p.s. I use WordPress 3.2.1 & plugin Theme Test Drive

when the gray bar is present...

2

The top bar of your theme is also positioned absolutely, so it doesn't know to come down. You can use is_admin_bar_showing() to check to see if it's showing, and then I'd probably just inject some styles using wp_head to move it down, since it's very little CSS.

All told, you'd get something in your theme's functions.php like:

add_action( 'wp_head', 'prefix_move_theme_down' );
function prefix_move_theme_down() {
  if ( is_admin_bar_showing() ) {
    ?>
    <style type="text/css">
    #header { top: 28px; }
    #content { margin-top: 68px; }
    </style>
    <?php
  }
}
2

The admin bar only shows up if you're logged in. If you don't like it at the top, you can always move it to the bottom. Add this to your theme's functions.php file:

<?php
    function fb_move_admin_bar() {
    echo '
<style type="text/css">
    body {
    padding-bottom: 28px;
    }
    body.admin-bar #wphead {
       padding-top: 0;
    }
    body.admin-bar #footer {
       padding-bottom: 28px;
    }
    #wpadminbar {
        top: auto !important;
        bottom: 0;
    }
    #wpadminbar .quicklinks .menupop ul {
        bottom: 28px;
    }
</style>';
}
add_action( 'admin_head', 'fb_move_admin_bar' );
add_action( 'wp_head', 'fb_move_admin_bar' );
?>
2

To hide the admin bar paste this function into function.php

    function hide_admin_bar_from_front_end(){
  if (is_blog_admin()) {
    return true;
  }
  return false;
}
add_filter( 'show_admin_bar', 'hide_admin_bar_from_front_end' );
0

Add this into functions.php :

if ( is_admin_bar_showing() && !is_admin() )
    _admin_bar_bump_cb();

This is default callback for the admin bar from wp-includes/admin-bar.php:

function _admin_bar_bump_cb() { ?>
<style type="text/css" media="screen">
    html { margin-top: 28px !important; }
    * html body { margin-top: 28px !important; }
</style>
<?php
}
0

It seems as while the other answers do work, the clean and intended way to do this according to WordPress Core Code is this:

add_action( 'after_setup_theme', function(){
   add_theme_support( 'admin-bar', array( 'callback' => '__return_false' ) );
} );

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