Move creation of plugin placeholder DOM from JS to C++.

Source/core/html/shadow/PluginPlaceholderElement.cpp

Index: Source/core/html/shadow/PluginPlaceholderElement.cpp
diff --git a/Source/core/html/shadow/PluginPlaceholderElement.cpp b/Source/core/html/shadow/PluginPlaceholderElement.cpp
index 74efd5581f3fba8c0eea153e418bf9210b437e95..f628ef58b0379742ccb6876da1c43a08c4edb8f2 100644
--- a/Source/core/html/shadow/PluginPlaceholderElement.cpp
+++ b/Source/core/html/shadow/PluginPlaceholderElement.cpp
@@ -6,33 +6,141 @@
 #include "core/html/shadow/PluginPlaceholderElement.h"
 
 #include "bindings/core/v8/V8PluginPlaceholderElement.h"
+#include "core/CSSPropertyNames.h"
+#include "core/CSSValueKeywords.h"
+#include "core/EventTypeNames.h"
 #include "core/dom/Document.h"
+#include "core/events/Event.h"
+#include "core/events/EventListener.h"
+#include "core/html/HTMLStyleElement.h"
+#include "platform/heap/Visitor.h"
 #include "wtf/Assertions.h"
+#include "wtf/Functional.h"
+#include "wtf/StdLibExtras.h"
+#include "wtf/text/AtomicString.h"
 
 namespace blink {
+namespace {
+
+// FIXME: Move this into a resource and @import it.
+const char kStyleSource[] =
+    "#plugin-placeholder {"
+    "    all: initial;"
+    "    width: 100%;"
+    "    height: 100%;"
+    "    overflow: hidden;"
+    "    display: flex;"
+    "    align-items: center;"
+    "    background: gray;"
+    "    font: 12px -webkit-control;"
+    "}"
+    "#plugin-placeholder-content {"
+    "    text-align: center;"
+    "    margin: auto;"
+    "}";
+
+// Invokes a closure when an event occurs.
+// Take care to use a WeakPtr where necessary to avoid reference cycles.
+class SimpleEventListener : public EventListener {
+public:
+    static PassRefPtr<SimpleEventListener> create(PassOwnPtr<Closure> closure)
+    {
+        return adoptRef(new SimpleEventListener(closure));
+    }
+
+    ~SimpleEventListener() override { }
+
+private:
+    SimpleEventListener(PassOwnPtr<Closure> closure)
+        : EventListener(CPPEventListenerType)
+        , m_closure(closure)
+    {
+    }
+
+    bool operator==(const EventListener& other) override { return this == &other; }
+
+    void handleEvent(ExecutionContext*, Event*) override
+    {
+        (*m_closure)();
+    }
+
+    OwnPtr<Closure> m_closure;
+};
+
+} // namespace
 
 PluginPlaceholderElement::PluginPlaceholderElement(Document& document)
     : HTMLDivElement(document)
+    , m_weakPtrFactory(this)
 {
 }
 
-PassRefPtrWillBeRawPtr<PluginPlaceholderElement> PluginPlaceholderElement::create(Document& document)
+PluginPlaceholderElement::~PluginPlaceholderElement()
 {
-    RefPtrWillBeRawPtr<PluginPlaceholderElement> element = adoptRefWillBeNoop(new PluginPlaceholderElement(document));
-    bool success = V8PluginPlaceholderElement::PrivateScript::createdCallbackMethod(document.frame(), element.get());
-    ASSERT_UNUSED(success, success);
-    return element.release();
+}
+
+void PluginPlaceholderElement::trace(Visitor* visitor)
+{
+    visitor->trace(m_messageElement);
+    visitor->trace(m_closeButton);
+    HTMLDivElement::trace(visitor);
 }
 
 void PluginPlaceholderElement::setMessage(const String& message)
 {
-    bool success = V8PluginPlaceholderElement::PrivateScript::messageAttributeSetter(document().frame(), this, message);
-    ASSERT_UNUSED(success, success);
+    m_messageElement->setTextContent(message);
 }
 
 void PluginPlaceholderElement::setIsCloseable(bool closeable)
 {
-    bool success = V8PluginPlaceholderElement::PrivateScript::closeableAttributeSetter(document().frame(), this, closeable);
+    if (closeable)
+        m_closeButton->removeInlineStyleProperty(CSSPropertyDisplay);
+    else
+        m_closeButton->setInlineStyleProperty(CSSPropertyDisplay, CSSValueNone);
+}
+
+void PluginPlaceholderElement::initialize()
+{
+    DEFINE_STATIC_LOCAL(AtomicString, elementId, ("plugin-placeholder", AtomicString::ConstructFromLiteral));
+    setIdAttribute(elementId);
+
+    RefPtrWillBeRawPtr<HTMLStyleElement> styleElement = HTMLStyleElement::create(document(), false);
+    styleElement->setTextContent(kStyleSource);
+
+    DEFINE_STATIC_LOCAL(AtomicString, contentElementId, ("plugin-placeholder-content", AtomicString::ConstructFromLiteral));
+    RefPtrWillBeRawPtr<HTMLDivElement> contentElement = HTMLDivElement::create(document());
+    contentElement->setIdAttribute(contentElementId);
+
+    DEFINE_STATIC_LOCAL(AtomicString, messageElementId, ("plugin-placeholder-message", AtomicString::ConstructFromLiteral));
+    RefPtrWillBeRawPtr<HTMLDivElement> messageElement = HTMLDivElement::create(document());
+    messageElement->setIdAttribute(messageElementId);
+
+    // FIXME: UI polish, l10n, etc. for the close button.
+    DEFINE_STATIC_LOCAL(AtomicString, closeButtonId, ("plugin-placeholder-close-button", AtomicString::ConstructFromLiteral));
+    RefPtrWillBeRawPtr<HTMLButtonElement> closeButton = HTMLButtonElement::create(document(), nullptr);
+    closeButton->setIdAttribute(closeButtonId);
+    closeButton->setTextContent("Close");
+    closeButton->setInlineStyleProperty(CSSPropertyDisplay, CSSValueNone);
+    closeButton->addEventListener(EventTypeNames::click, createSimpleEventListener(&PluginPlaceholderElement::onCloseButtonClick));
+
+    contentElement->appendChild(messageElement);
+    contentElement->appendChild(closeButton);
+    appendChild(styleElement);
+    appendChild(contentElement);
+
+    m_messageElement = messageElement.release();
+    m_closeButton = closeButton.release();
+}
+
+PassRefPtr<EventListener> PluginPlaceholderElement::createSimpleEventListener(void(PluginPlaceholderElement::*method)())
+{
+    return SimpleEventListener::create(bind(method, m_weakPtrFactory.createWeakPtr()));
+}
+
+void PluginPlaceholderElement::onCloseButtonClick()
+{
+    // FIXME: Record UMA Plugin_Hide_Click or an equivalent UseCounter.
+    bool success = V8PluginPlaceholderElement::PrivateScript::hideMethod(document().frame(), this);
     ASSERT_UNUSED(success, success);
 }