Theming mini calendar - I want background colors depending on count of events

I see that there is a lot of activity here (in the calendar issue queue). If you want I can prepare a patch ... but its just one array element:
'count' => count($items[$curday_date])
Will you give it a try? Would be nice.

Sorry, I had no time to test the code I posted. I didn't want to implement this feature on my one, instead I was waiting that it will made into the code (because I don't want to patch the module for each update).

But now I don't want to wait and I also was curious what my error was and I found out:

$items[$curday_date] is the array with items for the $curday_date, but they are grouped by start time (hours). I'm not sure if it is in every case like this, but in my case it is (see screen shot of one (debug) entry.

Therefore I need to count all values in side the hour groups. I'm not sure which is the best way to do so, I decided to count all elements of the 2 dimensional array and subtract the parents:

'count' => count($items[$curday_date], 1) - count($items[$curday_date],0)

Will this work in every case? Maybe this needs review of some one how knows a bit more about this.

To complete this issue I want to provide the missing informations how to theme the mini calendar so that the background colors will depend on the amount of events:

Add the mini calendar preprocess function to your template.php:

function template_preprocess_calendar_mini(&$vars) {
  foreach ($vars['rows'] as $weekno => $row) {
    foreach ($row as $day => $data) {
      if (100 <= $data['count']) {
        $vars['rows'][$weekno][$day]['count'] = 'gte_100';
      }
      for ($i=0; 100 > $i; $i+=10) { 
        // set class for count which corresponds to its value
        if ($i <= $data['count'] && $i+10 > $data['count']) {
          $vars['rows'][$weekno][$day]['count'] = 'gte_'. $i;
          break;      
        }
      }
    }
  }
}

The values of $i in for ($i=0; 100 > $i; $i+=10) depends on how many events you expect to have and how you want to group them for your styling.

Copy the calendar-mini.tpl.php from the modules theme folder in your theme folder and add the class to style the background of your calendar cells (' event_count_'. $cell['count']) behind the other css classes like indicated in the following snipped:

    <?php foreach ($row as $cell): ?>
      <td id="<?php print $cell['id']; ?>" class="<?php print $cell['class'] .' event_count_'. $cell['count']; ?>">
        <?php print $cell['data']; ?>
      </td>
    <?php endforeach; ?>

The last thing you have to do is to style your calendar. Add something like this to your theme css:

.calendar-calendar tr td.event_count_gte_0 { background-color:#f7ffe4; }
.calendar-calendar tr td.event_count_gte_10 { background-color:#f0ffc6; }
.calendar-calendar tr td.event_count_gte_20 { background-color:#ecffb8; }
[...]
.calendar-calendar tr td.event_count_gte_100 { background-color:#f5e086; }


As result you will have a mini calender with different background colors for the table cells containing days with different amount of events. For an example see http://cyber4kids.de/kalender

Now I hope KarenS will have a look on this and adds the little change I explained in #4 to the calendar.inc ... to make calendar updates easier ;)

@peterh: I think the mini calender is a block. So you may theme the table cells just for this block. So you won't need to hack more of the modules code.

@prophet108 (#7) I don't think your problem is related to this issue. This issue is about theming the mini calendar (where you only have the days of a month, as you can see here: http://cyber4kids.de/kalender). What you want is "how many days are left till the event start". I think this information can already provided by views, you only have to write some code to get this information into css attributes. If you need further help please open a new support request issue.

I'd really like to see this feature in the upcoming calendar release. Therefore I've created a patch for the little changes in includes/calendar.inc (see #4).

peterh in #5 confirmed that it is working. Anyway, I don't want to add the classes as suggested by peterh, because I think this will be different for each use of the calendar module. Although, maybe just define a basic use case like in #6 to get this work in general and someone who needs different classes may change it in template_preprocess_calendar_mini.

Any discussions and reviews are welcome.

Not entirely true, it's part of d6lts.