Implementation of media controls download button.

third_party/WebKit/Source/core/html/shadow/MediaControlElements.cpp

 /*
  * Copyright (C) 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2012 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:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 18 matching lines @@
 
 #include "core/html/shadow/MediaControlElements.h"
 
 #include "bindings/core/v8/ExceptionStatePlaceholder.h"
 #include "core/InputTypeNames.h"
 #include "core/dom/ClientRect.h"
 #include "core/dom/Text.h"
 #include "core/dom/shadow/ShadowRoot.h"
 #include "core/events/MouseEvent.h"
 #include "core/frame/LocalFrame.h"
+#include "core/html/HTMLAnchorElement.h"
 #include "core/html/HTMLLabelElement.h"
 #include "core/html/HTMLMediaSource.h"
 #include "core/html/HTMLSpanElement.h"
 #include "core/html/HTMLVideoElement.h"
 #include "core/html/TimeRanges.h"
 #include "core/html/shadow/MediaControls.h"
 #include "core/html/track/TextTrackList.h"
 #include "core/input/EventHandler.h"
 #include "core/layout/api/LayoutSliderItem.h"
 #include "platform/EventDispatchForbiddenScope.h"
@@ skipping 576 matching lines @@
 
     MediaControlDivElement::defaultEventHandler(event);
 }
 
 // ----------------------------
 MediaControlDownloadButtonElement::MediaControlDownloadButtonElement(MediaControls& mediaControls)
     : MediaControlInputElement(mediaControls, MediaDownloadButton)
 {
 }
 
-MediaControlDownloadButtonElement* MediaControlDownloadButtonElement::create(MediaControls& mediaControls, Document* document)
+MediaControlDownloadButtonElement* MediaControlDownloadButtonElement::create(MediaControls& mediaControls)
 {
     MediaControlDownloadButtonElement* button = new MediaControlDownloadButtonElement(mediaControls);
     button->ensureUserAgentShadowRoot();
     button->setType(InputTypeNames::button);
     button->setShadowPseudoId(AtomicString("-internal-download-button"));
     button->setIsWanted(false);
     return button;
 }
 
 WebLocalizedString::Name MediaControlDownloadButtonElement::getOverflowStringName()
 {
     return WebLocalizedString::OverflowMenuDownload;
 }
 
 bool MediaControlDownloadButtonElement::shouldDisplayDownloadButton()
 {
     const KURL& url = mediaElement().currentSrc();
     if (!HTMLMediaElement::isMediaStreamURL(url.getString()) && !url.protocolIs("blob") && !HTMLMediaSource::lookup(url)) {
         return true;
     }
     return false;
 }
 
 void MediaControlDownloadButtonElement::defaultEventHandler(Event* event)
 {
-    // TODO(kdsilva): The implementation will be finished as part of
-    // https://crbug.com/601247
+    const KURL& url = mediaElement().currentSrc();
+    if (event->type() == EventTypeNames::click && url != KURL()) {

[whywhat, 2016/09/13 15:52:16]

nit: perhaps replace url != KURL() with !(url.IsNull() || url.IsEmpty()) ?
== operator for urls seems to invoke lots of methods for just comparing with a
new empty URL.
maybe it optimizes itself out though. I suggest checking manually at least that
null and empty urls will work correctly (I remember getting NPE with KURL just
for not checking IsNull in some places).

[kdsilva, 2016/09/13 17:33:01]

Done.

+        if (!m_anchor) {
+            HTMLAnchorElement* anchor = HTMLAnchorElement::create(document());
+            anchor->setAttribute(HTMLNames::downloadAttr, "");
+            m_anchor = anchor;
+        }
+        m_anchor->setURL(url);
+        m_anchor->dispatchSimulatedClick(event);
+    }
+    MediaControlInputElement::defaultEventHandler(event);
+}
+
+DEFINE_TRACE(MediaControlDownloadButtonElement)
+{
+    visitor->trace(m_anchor);
+    MediaControlInputElement::trace(visitor);
 }
 
 // ----------------------------
 
 MediaControlTimelineElement::MediaControlTimelineElement(MediaControls& mediaControls)
     : MediaControlInputElement(mediaControls, MediaSlider)
 {
 }
 
 MediaControlTimelineElement* MediaControlTimelineElement::create(MediaControls& mediaControls)
@@ skipping 303 matching lines @@
 }
 
 MediaControlCurrentTimeDisplayElement* MediaControlCurrentTimeDisplayElement::create(MediaControls& mediaControls)
 {
     MediaControlCurrentTimeDisplayElement* element = new MediaControlCurrentTimeDisplayElement(mediaControls);
     element->setShadowPseudoId(AtomicString("-webkit-media-controls-current-time-display"));
     return element;
 }
 
 } // namespace blink