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    <p>The category-overlay.png image is merely a gradient overlay to give the category bar the right looks.</p> <p>Two options here. One more easy but not as reliable, the other a bit more difficult:</p> <h1>Option A: Easy</h1> <p>Create a userChrome.css in your $profile/chrome/ directory. It should contain the following:</p> <pre> .calendar-color-box[categories~="mycategory"], .calendar-event-box-container[categories~="mycategory"] { background-color: #abc123 !important; } </pre> <p>You'll need to do this for each category you'd like to change the color for. Note that changing the color of the category in the Lightning options won't change the category color you set here.</p> <h1>Option B: More complete</h1> <p>You'll need to modify some files inside lightning.xpi here. This solution merely requires you to set the category colors in Lightning and will also work for newly added categories. Note that this way events without a category are transparent, if you want more you'll have to do it on your own.</p> <ol> <li>Open lightning.xpi with a zip program</li> <li>Enter the directory chrome/</li> <li>Open the containing calendar.jar with a zip program</li> <li>Descend into content/calendar/</li> <li>Open calendar-multiday-view.xml <ul> <li>search "calendar-color-box" and remove it from the class attribute</li> <li>a few lines above there is a &lt;content&gt; tag, add class="category-color-box" to it</li> </ul></li> <li>Open calendar-month-view.xml and calendar-view-core.xml and do the same</li> <li>Save the files back to calendar.jar</li> <li>Save calendar.jar back to lightning.xpi</li> <li>Install the modified lightning.xpi</li> </ol> <p>If you'd rather see a patch, this applies to the latest comm-central source:</p> <pre><code>diff --git a/calendar/base/content/calendar-month-view.xml b/calendar/base/content/calendar-month-view.xml --- a/calendar/base/content/calendar-month-view.xml +++ b/calendar/base/content/calendar-month-view.xml @@ -52,21 +52,20 @@ &lt;bindings id="calendar-month-view-bindings" xmlns="http://www.mozilla.org/xbl" xmlns:html="http://www.w3.org/1999/xhtml" xmlns:xul="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul" xmlns:xbl="http://www.mozilla.org/xbl"&gt; &lt;binding id="calendar-month-day-box-item" extends="chrome://calendar/content/calendar-view-core.xml#calendar-editable-item"&gt; - &lt;content mousethrough="never" tooltip="itemTooltip"&gt; + &lt;content mousethrough="never" tooltip="itemTooltip" class="category-color-box"&gt; &lt;xul:vbox flex="1"&gt; &lt;xul:hbox&gt; &lt;xul:box anonid="event-container" - class="calendar-color-box" xbl:inherits="calendar-uri,calendar-id" flex="1"&gt; &lt;xul:box class="calendar-event-selection" orient="horizontal" flex="1"&gt; &lt;xul:stack anonid="eventbox" class="calendar-event-box-container" xbl:inherits="readonly,flashing,alarm,allday,priority,progress,status,calendar,categories" flex="1"&gt; &lt;xul:hbox class="calendar-event-details"&gt; diff --git a/calendar/base/content/calendar-multiday-view.xml b/calendar/base/content/calendar-multiday-view.xml --- a/calendar/base/content/calendar-multiday-view.xml +++ b/calendar/base/content/calendar-multiday-view.xml @@ -2119,20 +2119,19 @@ ]]&gt;&lt;/handler&gt; &lt;/handlers&gt; &lt;/binding&gt; &lt;!-- - An individual event box, to be inserted into a column. --&gt; &lt;binding id="calendar-event-box" extends="chrome://calendar/content/calendar-view-core.xml#calendar-editable-item"&gt; - &lt;content mousethrough="never" tooltip="itemTooltip"&gt; + &lt;content mousethrough="never" tooltip="itemTooltip" class="category-color-box"&gt; &lt;xul:box xbl:inherits="orient,width,height" flex="1"&gt; &lt;xul:box anonid="event-container" - class="calendar-color-box" xbl:inherits="orient,readonly,flashing,alarm,allday,priority,progress,status,calendar,categories,calendar-uri,calendar-id" flex="1"&gt; &lt;xul:box class="calendar-event-selection" orient="horizontal" flex="1"&gt; &lt;xul:stack anonid="eventbox" align="stretch" class="calendar-event-box-container" flex="1" xbl:inherits="context,parentorient=orient,readonly,flashing,alarm,allday,priority,progress,status,calendar,categories"&gt; diff --git a/calendar/base/content/calendar-view-core.xml b/calendar/base/content/calendar-view-core.xml --- a/calendar/base/content/calendar-view-core.xml +++ b/calendar/base/content/calendar-view-core.xml @@ -46,21 +46,21 @@ xmlns="http://www.mozilla.org/xbl" xmlns:html="http://www.w3.org/1999/xhtml" xmlns:xul="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul" xmlns:xbl="http://www.mozilla.org/xbl"&gt; &lt;binding id="calendar-editable-item"&gt; &lt;content mousethrough="never" tooltip="itemTooltip" - tabindex="-1"&gt; + tabindex="-1" + class="category-color-box"&gt; &lt;xul:vbox flex="1"&gt; &lt;xul:hbox&gt; &lt;xul:box anonid="event-container" - class="calendar-color-box" xbl:inherits="calendar-uri,calendar-id" flex="1"&gt; &lt;xul:box class="calendar-event-selection" orient="horizontal" flex="1"&gt; &lt;xul:stack anonid="eventbox" class="calendar-event-box-container" flex="1" xbl:inherits="readonly,flashing,alarm,allday,priority,progress,status,calendar,categories"&gt; &lt;xul:hbox class="calendar-event-details"&gt; </code></pre> <h1>Option C: Change Javascript</h1> <p>This would be the best working hack, although it requires javascript changes. Open calendar.jar as described in Option B and check out calendar-views.js, there are two functions: <code>updateStyleSheetForViews()</code> and <code>updateStyleSheetForCategory()</code>. I'll leave this to people that want to tinker with it themselves, but the idea would be to add a rule for <code>.calendar-color-box[categories~=...]</code> that overrides the default rule in case there are categories. This way if there is no category set, the calendar color is used, otherwise the desired category color.</p> <p>Have fun :)</p>
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    1. POHow can I "hack" the Thunderbird Lightning extension to fully color categories
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    1. USPhilipp Kewisch
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    1. COwow. cheers. I haven't tried this yet, but I'll mark yours as answer anyway.
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      1. USMartin Ba
    2. COFirst approach works like a charm, note the chrome directory and userChrome.css files don't exist by default (you have to create them manually). More on that here - http://eriwen.com/css/tweaking-thunderbirds-chrome/
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    3. COActually, I spoke a little too soon. The first approach doesn't work for the month view, digging through the XUL it looks like they put the categories attribute on a different element. To do all the calendars you need the following for each category ```.calendar-color-box[categories~="mycategory"], .calendar-event-box-container[categories~="mycategory"] { background-color: #52ba52 !important; }```. I've edited @Philipp's original answer with this change. He just needs to accept it.
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