Add a simple button UIExample

Summary: For visualizing D3919.

Test Plan: {F22921}

Reviewers: chad, btrahan

Reviewed By: chad

CC: aran

Differential Revision: https://secure.phabricator.com/D3922

src/__phutil_library_map__.php

@@ -608,6 +608,7 @@ phutil_register_library_map(array(
     'PhabricatorBarePageView' => 'view/page/PhabricatorBarePageView.php',
     'PhabricatorBaseEnglishTranslation' => 'infrastructure/internationalization/PhabricatorBaseEnglishTranslation.php',
     'PhabricatorBuiltinPatchList' => 'infrastructure/storage/patch/PhabricatorBuiltinPatchList.php',
+    'PhabricatorButtonsExample' => 'applications/uiexample/examples/PhabricatorButtonsExample.php',
     'PhabricatorCacheDAO' => 'applications/cache/storage/PhabricatorCacheDAO.php',
     'PhabricatorCalendarBrowseController' => 'applications/calendar/controller/PhabricatorCalendarBrowseController.php',
     'PhabricatorCalendarController' => 'applications/calendar/controller/PhabricatorCalendarController.php',
@@ -1821,6 +1822,7 @@ phutil_register_library_map(array(
     'PhabricatorBarePageView' => 'AphrontPageView',
     'PhabricatorBaseEnglishTranslation' => 'PhabricatorTranslation',
     'PhabricatorBuiltinPatchList' => 'PhabricatorSQLPatchList',
+    'PhabricatorButtonsExample' => 'PhabricatorUIExample',
     'PhabricatorCacheDAO' => 'PhabricatorLiskDAO',
     'PhabricatorCalendarBrowseController' => 'PhabricatorCalendarController',
     'PhabricatorCalendarController' => 'PhabricatorController',

src/applications/uiexample/examples/PhabricatorButtonsExample.php

@@ -0,0 +1,45 @@
+<?php
+
+final class PhabricatorButtonsExample extends PhabricatorUIExample {
+
+  public function getName() {
+    return 'Buttons';
+  }
+
+  public function getDescription() {
+    return 'Use <tt>&lt;button&gt;</tt> to render buttons.';
+  }
+
+  public function renderExample() {
+    $request = $this->getRequest();
+    $user = $request->getUser();
+
+    $colors = array('', 'green', 'grey', 'disabled');
+    $sizes = array('', 'small');
+    $tags = array('a', 'button');
+
+    $view = array();
+    foreach ($tags as $tag) {
+      foreach ($colors as $color) {
+        foreach ($sizes as $size) {
+          $class = implode(' ', array($color, $size));
+
+          if ($tag == 'a') {
+            $class .= ' button';
+          }
+
+          $view[] = phutil_render_tag(
+            $tag,
+            array(
+              'class' => $class,
+            ),
+            phutil_escape_html(ucwords($size.' '.$color.' '.$tag)));
+
+          $view[] = '<br /><br />';
+        }
+      }
+    }
+
+    return '<div style="margin: 1em 2em;">'.implode('', $view).'</div>';
+  }
+}