Changes between Initial Version and Version 1 of Styling Form Controls

Timestamp:

Oct 18, 2010, 5:32:17 AM (15 years ago)

Author:

morrita@google.com

Comment:

--

Styling Form Controls

@@ +1 @@
+= Styling Form Controls Using Pseudo Classes =
+
+WebKit provides a way to give CSS styles to form controls.
+Some form controls can be styled through pseudo classes. 
+This article will illustrate how we 
+can customize their appearances using the pseudo classes.
+
+== <progress> ==
+
+You can customize {{{<progress>}}} element by {{{-webkit-progress-bar-value}}} pseudo class.
+An example following:
+
+{{{
+progress.custom {
+    -webkit-appearance: none;
+    background-color: blue;
+}
+
+progress.custom::-webkit-progress-bar-value {
+    background-color: red;
+}
+}}}
+
+In this example, we first disable the default visual by {{{-webkit-appearance: none}}}, 
+then give styles, one for {{{<progress>}}} element itself, another for its "bar" part.
+
+With this tyle, following HTML fragment...
+
+{{{
+  <progress class="custom" min="0" max="100" value="30" />
+}}}
+
+...looks like:
+
+XXX.
+
+== <meter> ==
+
+As {{{<progress>}}}, {{{<meter>}}} can be customized by pseudo classes.
+But it's more complicated because {{{<meter>}}} has three different 3 states ({{{optimal}}}, {{{suboptimal}}} and {{{even-less-good}}})
+and 2 directions ({{{horizontal}}} and {{{vertical}}}). 
+
+WebKit defines 8 pseudo classes to handle them: 
+
+{{{
+  meter.custom::-webkit-meter-horizontal-bar { background: gray; }
+  meter.custom::-webkit-meter-horizontal-optimum-value { background: green; }
+  meter.custom::-webkit-meter-horizontal-suboptimal-value { background: yellow; }
+  meter.custom::-webkit-meter-horizontal-even-less-good-value { background: red; }
+  meter.custom::-webkit-meter-vertical-bar { background: gray; }
+  meter.custom::-webkit-meter-vertical-optimum-value { background: blue; }
+  meter.custom::-webkit-meter-vertical-suboptimal-value { background: purple; }
+  meter.custom::-webkit-meter-vertical-even-less-good-value { background: white; }
+}}}
+
+Note that background "bar" part has directions, but has no state.
+
+With this style, following HTML fragment...
+{{{
+  <meter class="custom" style="height:20px; width:80px;" min="0" max="100" low="30" high="60" optimum="100" value="90" ></meter>
+  <meter class="custom" style="height:20px; width:80px;" min="0" max="100" low="30" high="60" optimum="100" value="30" ></meter>
+  <meter class="custom" style="height:20px; width:80px;" min="0" max="100" low="30" high="60" optimum="100" value="10" ></meter>
+  <meter class="custom" style="height:100px; width:80px;" min="0" max="100" low="30" high="60" optimum="100" value="90" ></meter>
+  <meter class="custom" style="height:100px; width:80px;" min="0" max="100" low="30" high="60" optimum="100" value="50" ></meter>
+  <meter class="custom" style="height:100px; width:80px;" min="0" max="100" low="30" high="60" optimum="100" value="10" ></meter>
+}}}
+
+...looks like  this:
+
+XXX:
+
+=== <meter> variations ===
+
+On Mac OS X, WebKit provide multiple built-in appearances for {{{<meter>}}}.
+
+ * {{{-webkit-appearance: continuous-capacity-level-indicator;}}} (Default)
+ * {{{-webkit-appearance: discrete-capacity-level-indicator;}}}
+ * {{{-webkit-appearance: relevancy-level-indicator;}}}
+ * {{{-webkit-appearance: rating-level-indicator;}}}
+
+You can find the rendering result in the test suite:
+
+ * [source:trunk/LayoutTests/platform/mac/fast/dom/HTMLMeterElement/meter-appearances-capacity-expected.png]
+ * [source:trunk/LayoutTests/platform/mac/fast/dom/HTMLMeterElement/meter-appearances-rating-relevancy-expected.png]
+
+== <input> element ==
+
+Coming soon...