Web Animations API: Start implementation of Element.animate().

Source/core/animation/ElementAnimation.cpp

+/*
+ * Copyright (C) 2013 Google Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "config.h"
+#include "core/animation/ElementAnimation.h"
+
+#include "core/animation/DocumentTimeline.h"
+#include "core/css/resolver/StyleResolver.h"
+#include "core/page/RuntimeCSSEnabled.h"
+#include "wtf/text/StringBuilder.h"
+
+
+namespace WebCore {
+
+CSSPropertyID ElementAnimation::camelCaseCSSPropertyNameToID(StringImpl* propertyName)
+{
+    typedef HashMap<StringImpl*, CSSPropertyID> CSSPropertyIDMap;
+    DEFINE_STATIC_LOCAL(CSSPropertyIDMap, map, ());
+
+    if (propertyName->find('-') != kNotFound)
+        return CSSPropertyInvalid;
+
+    CSSPropertyID id = map.get(propertyName);
+
+    if (!id) {
+        StringBuilder builder;
+        size_t position = 0;
+        size_t end;
+        while ((end = propertyName->find(isASCIIUpper, position)) != kNotFound) {
+            builder.append(propertyName->substring(position, end - position) + "-" + toASCIILower((*propertyName)[end]));
+            position = end + 1;
+        }
+        builder.append(propertyName->substring(position));
+        // Doesn't handle prefixed properties.
+        id = cssPropertyID(builder.toString());
+        if (id != CSSPropertyInvalid && RuntimeCSSEnabled::isCSSPropertyEnabled(id))
+            map.add(propertyName, id);
+    }
+    return id;
+}
+
+void ElementAnimation::animate(Element* element, Vector<Dictionary> keyframeDictionaryVector)
+{
+    ASSERT(RuntimeEnabledFeatures::webAnimationsAPIEnabled());
+
+    // FIXME: This test will not be neccessary once resolution of keyframe values occurs at
+    // animation application time.
+    if (!element->inActiveDocument()) {
+        return;
+    }

[esprehn, 2013/12/12 06:40:11]

nit: braces are not needed for one line if statemenet

+    element->document().updateStyleIfNeeded();
+    if (!element->renderer()) {
+        return;
+    }
+
+    startAnimation(element, keyframeDictionaryVector);
+}
+
+void ElementAnimation::startAnimation(Element* element, Vector<Dictionary> keyframeDictionaryVector)
+{
+    KeyframeAnimationEffect::KeyframeVector keyframes;
+    Vector<RefPtr<MutableStylePropertySet> > propertySetVector;
+
+    for (size_t i = 0; i < keyframeDictionaryVector.size(); ++i) {
+        RefPtr<MutableStylePropertySet> propertySet = MutableStylePropertySet::create();
+        propertySetVector.append(propertySet);
+
+        RefPtr<Keyframe> keyframe = Keyframe::create();
+        keyframes.append(keyframe);
+
+        double offset;
+        if (keyframeDictionaryVector[i].get("offset", offset)) {
+            keyframe->setOffset(offset);
+        } else {
+            // FIXME: Web Animations CSS engine does not yet implement handling of
+            // keyframes without specified offsets. This check can be removed when
+            // that funcitonality is implemented.
+            ASSERT_NOT_REACHED();
+            return;
+        }
+
+        String compositeString;
+        keyframeDictionaryVector[i].get("composite", compositeString);
+        if (compositeString == "add")
+            keyframe->setComposite(AnimationEffect::CompositeAdd);
+
+        Vector<String> keyframeProperties;
+        keyframeDictionaryVector[i].getOwnPropertyNames(keyframeProperties);
+
+        for (size_t j = 0; j < keyframeProperties.size(); ++j) {
+            String property = keyframeProperties[j];
+            CSSPropertyID id = camelCaseCSSPropertyNameToID(property.impl());
+
+            // FIXME: There is no way to store invalid properties or invalid values
+            // in a Keyframe object, so for now I just skip over them. Eventually we
+            // will need to support getFrames(), which should return exactly the
+            // keyframes that were input through the API. We will add a layer to wrap
+            // KeyframeAnimationEffect, store input keyframes and implement getFrames.
+            if (id == CSSPropertyInvalid || !CSSAnimations::isAnimatableProperty(id))
+                continue;
+
+            String value;
+            keyframeDictionaryVector[i].get(property, value);
+            propertySet->setProperty(id, value);
+        }
+    }
+
+    // FIXME: Replace this with code that just parses, when that code is available.
+    RefPtr<KeyframeAnimationEffect> effect = StyleResolver::createKeyframeAnimationEffect(*element, propertySetVector, keyframes);
+
+    // FIXME: Totally hardcoded Timing for now. Will handle timing parameters later.
+    Timing timing;
+    timing.hasIterationDuration = true;
+    timing.iterationDuration = 1;
+
+    RefPtr<Animation> animation = Animation::create(element, effect, timing);
+    DocumentTimeline* timeline = element->document().timeline();
+    ASSERT(timeline);
+    timeline->play(animation.get());
+}
+
+} // namespace WebCore