js: Add loading spinner to packages page.

* css/guix.css: Add spinner styles.
* js/controller/packages.js (guix.packages.view): Explicitly redraw
  after loading packages.
* js/model/packages.js (guix.packages.Packages): Load packages in the
  background.
* js/view/layout.js (guix.withLayout): Cast elem to array if needed.
* js/view/packages.js (guix.packages.view): Render spinner when there
  are no packages to display.

1 files changed, 104 insertions, 0 deletions

diff --git a/css/guix.css b/css/guix.css
index 0534209..040f239 100644
--- a/css/guix.css
+++ b/css/guix.css
@@ -13,3 +13,107 @@
 .sorter {
     cursor: pointer;
 }
+
+/* Loading Spinner */
+
+@-webkit-keyframes spinner {
+  0% {
+    -webkit-transform: rotate(0deg);
+    -moz-transform: rotate(0deg);
+    -ms-transform: rotate(0deg);
+    -o-transform: rotate(0deg);
+    transform: rotate(0deg);
+  }
+
+  100% {
+    -webkit-transform: rotate(360deg);
+    -moz-transform: rotate(360deg);
+    -ms-transform: rotate(360deg);
+    -o-transform: rotate(360deg);
+    transform: rotate(360deg);
+  }
+}
+
+@-moz-keyframes spinner {
+  0% {
+    -webkit-transform: rotate(0deg);
+    -moz-transform: rotate(0deg);
+    -ms-transform: rotate(0deg);
+    -o-transform: rotate(0deg);
+    transform: rotate(0deg);
+  }
+
+  100% {
+    -webkit-transform: rotate(360deg);
+    -moz-transform: rotate(360deg);
+    -ms-transform: rotate(360deg);
+    -o-transform: rotate(360deg);
+    transform: rotate(360deg);
+  }
+}
+
+@-o-keyframes spinner {
+  0% {
+    -webkit-transform: rotate(0deg);
+    -moz-transform: rotate(0deg);
+    -ms-transform: rotate(0deg);
+    -o-transform: rotate(0deg);
+    transform: rotate(0deg);
+  }
+
+  100% {
+    -webkit-transform: rotate(360deg);
+    -moz-transform: rotate(360deg);
+    -ms-transform: rotate(360deg);
+    -o-transform: rotate(360deg);
+    transform: rotate(360deg);
+  }
+}
+
+@keyframes spinner {
+  0% {
+    -webkit-transform: rotate(0deg);
+    -moz-transform: rotate(0deg);
+    -ms-transform: rotate(0deg);
+    -o-transform: rotate(0deg);
+    transform: rotate(0deg);
+  }
+
+  100% {
+    -webkit-transform: rotate(360deg);
+    -moz-transform: rotate(360deg);
+    -ms-transform: rotate(360deg);
+    -o-transform: rotate(360deg);
+    transform: rotate(360deg);
+  }
+}
+
+/* :not(:required) hides this rule from IE9 and below */
+.spinner:not(:required) {
+  -webkit-animation: spinner 1500ms infinite linear;
+  -moz-animation: spinner 1500ms infinite linear;
+  -ms-animation: spinner 1500ms infinite linear;
+  -o-animation: spinner 1500ms infinite linear;
+  animation: spinner 1500ms infinite linear;
+  -webkit-border-radius: 0.5em;
+  -moz-border-radius: 0.5em;
+  -ms-border-radius: 0.5em;
+  -o-border-radius: 0.5em;
+  border-radius: 0.5em;
+  -webkit-box-shadow: rgba(0, 0, 51, 0.3) 1.5em 0 0 0, rgba(0, 0, 51, 0.3) 1.1em 1.1em 0 0, rgba(0, 0, 51, 0.3) 0 1.5em 0 0, rgba(0, 0, 51, 0.3) -1.1em 1.1em 0 0, rgba(0, 0, 51, 0.3) -1.5em 0 0 0, rgba(0, 0, 51, 0.3) -1.1em -1.1em 0 0, rgba(0, 0, 51, 0.3) 0 -1.5em 0 0, rgba(0, 0, 51, 0.3) 1.1em -1.1em 0 0;
+  -moz-box-shadow: rgba(0, 0, 51, 0.3) 1.5em 0 0 0, rgba(0, 0, 51, 0.3) 1.1em 1.1em 0 0, rgba(0, 0, 51, 0.3) 0 1.5em 0 0, rgba(0, 0, 51, 0.3) -1.1em 1.1em 0 0, rgba(0, 0, 51, 0.3) -1.5em 0 0 0, rgba(0, 0, 51, 0.3) -1.1em -1.1em 0 0, rgba(0, 0, 51, 0.3) 0 -1.5em 0 0, rgba(0, 0, 51, 0.3) 1.1em -1.1em 0 0;
+  box-shadow: rgba(0, 0, 51, 0.3) 1.5em 0 0 0, rgba(0, 0, 51, 0.3) 1.1em 1.1em 0 0, rgba(0, 0, 51, 0.3) 0 1.5em 0 0, rgba(0, 0, 51, 0.3) -1.1em 1.1em 0 0, rgba(0, 0, 51, 0.3) -1.5em 0 0 0, rgba(0, 0, 51, 0.3) -1.1em -1.1em 0 0, rgba(0, 0, 51, 0.3) 0 -1.5em 0 0, rgba(0, 0, 51, 0.3) 1.1em -1.1em 0 0;
+  display: inline-block;
+  font-size: 18px;
+  width: 1em;
+  height: 1em;
+  margin: 1.5em;
+  overflow: hidden;
+  text-indent: 100%;
+}
+
+.spinner-container {
+    width: 1em;
+    margin: 0 auto;
+    padding: 32px;
+}