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11908810
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2012-08-10T20:29:01.537
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2012-08-13T12:59:27.733
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<p>Here is how I got it working.</p> <h2>Using a plugin</h2> <p>I have downloaded <strong>Eclipse UI Themes</strong> plugin as described <a href="https://github.com/eclipse-color-theme/eclipse-ui-themes" rel="nofollow noreferrer">here</a> (<a href="https://github.com/downloads/eclipse-color-theme/eclipse-ui-themes/com.github.eclipsecolortheme.themes_1.0.0.201207121019.zip" rel="nofollow noreferrer">direct link</a> to an archive). But instead of extracting it into <code>dropins</code> directory, I extracted it into <code>plugins</code>. Also I changed its permissions to allow everyone to modify its files.</p> <p>At this point you have:</p> <pre> plugins/com.github.eclipsecolortheme.themes_1.0.0.201207121019/ ├── com │ └── github │ └── eclipsecolortheme │ └── themes │ └── Activator.class ├── META-INF │ └── MANIFEST.MF ├── plugin.xml └── themes └── css └── <b>juno.css</b> </pre> <p><code>juno.css</code> file is what you want. After launching Eclipse, this theme will be available under <em>Appearance -> Dark Juno</em>.</p> <h2>Without a plugin</h2> <p>After looking into <code>plugin.xml</code>, I had an idea how to create a new theme without using any plugin.</p> <pre><code><?xml version="1.0" encoding="UTF-8"?> <?eclipse version="3.4"?> <plugin> <extension point="org.eclipse.e4.ui.css.swt.theme"> <theme basestylesheeturi="themes/css/juno.css" id="com.github.eclipsecolortheme.themes.darkjuno" label="Dark Juno"> </theme> </extension> </plugin> </code></pre> <p>One can add <code>org.eclipse.e4.ui.css.swt.theme</code> extension point to an existing plugin, say <code>org.eclipse.platform_4.2.0.v201206081400</code>. Moreover, its <code>plugin.xml</code> already have this extension point, and the only thing you have to do is to add an appropriate <code>theme</code>. Please note, that it must have a unique <code>id</code>.</p> <pre><code> <theme basestylesheeturi="css/my_theme.css" id="org.eclipse.e4.ui.css.theme.my_theme" label="My Theme Name"> </theme> </code></pre> <p>A new CSS file can be placed into the <code>css</code> directory, which already contains the default set of themes.</p> <pre> org.eclipse.platform_4.2.0.v201206081400/ ├── ... ├── css │ ├── e4_basestyle.css │ ├── e4_classic_win7.css │ ├── e4_classic_winxp.css │ ├── e4_default.css │ ├── e4_default_gtk.css │ └── ... ├── images │ ├── gtkGrey.png │ ├── gtkHandleDark.png │ ├── gtkHandle.png │ ├── gtkTSFrameDark.png │ ├── gtkTSFrame.png │ └── ... ├── META-INF │ ├── eclipse.inf │ ├── ECLIPSE_.RSA │ ├── ECLIPSE_.SF │ └── MANIFEST.MF ├── platform.jar ├── plugin.properties ├── plugin.xml └── ... </pre> <p>After restarting Eclipse with <code>-clean</code> option you will see a newly created item in the list of all themes: <img src="https://i.stack.imgur.com/f0r7t.png" alt="The newly registered theme"></p> <h1>UPD. 1</h1> <p>For my installation it seems that changes to CSS apply on Eclipse restarting (<em>File -> Restart</em>, or just quitting and starting it manually).</p> <p>The only weird behavior I have noticed is that CSS files from <code>~/.e4css</code> directory (if any exists) override thus ones from the plugin directory. I'm not sure where it comes from, but I can safely remove any files from it. I also don't know this directory even exists on non-Linux systems, but if it does, I guess it should be located somewhere in a home directory of the user, or maybe in <code>Documents</code>.</p> <h1>UPD. 2</h1> <p>I just tried to add a new theme from scratch and noticed that there was a small mistake in the XML above. In order to get a new theme properly registered it must have a unique <code>id</code> attribute. Otherwise you will get an error:</p> <pre><code>java.lang.IllegalArgumentException: A theme with the id 'org.eclipse.e4.ui.css.theme.e4_default' is already registered at org.eclipse.e4.ui.css.swt.internal.theme.ThemeEngine.registerTheme(ThemeEngine.java:186) ... </code></pre> <p>And it seems that I were not right saying just restarting Eclipse to register a new theme is enough. However, <code>eclipse -clean</code> does the trick.</p>
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