[InputEvent] Fire 'beforeinput' during typing, pressing hot keys and IME composition

third_party/WebKit/Source/core/editing/commands/EditorCommand.cpp

Index: third_party/WebKit/Source/core/editing/commands/EditorCommand.cpp
diff --git a/third_party/WebKit/Source/core/editing/commands/EditorCommand.cpp b/third_party/WebKit/Source/core/editing/commands/EditorCommand.cpp
index 240080bb55bfea13f1708e02bf9ba3cb23b7e199..aa82d5768d41eab1ee5ace76dcc5ba7d655e22b4 100644
--- a/third_party/WebKit/Source/core/editing/commands/EditorCommand.cpp
+++ b/third_party/WebKit/Source/core/editing/commands/EditorCommand.cpp
@@ -48,6 +48,7 @@
 #include "core/editing/serializers/Serialization.h"
 #include "core/editing/spellcheck/SpellChecker.h"
 #include "core/events/Event.h"
+#include "core/events/InputEvent.h"
 #include "core/frame/FrameHost.h"
 #include "core/frame/FrameView.h"
 #include "core/frame/LocalFrame.h"
@@ -1779,6 +1780,16 @@ bool Editor::Command::execute(const String& parameter, Event* triggeringEvent) c
         if (!isSupported() || !m_frame || !m_command->allowExecutionWhenDisabled)
             return false;
     }
+
+    if (RuntimeEnabledFeatures::inputEventEnabled()) {
+        if (EventTarget* target = eventTargetNodeForDocument(m_frame->document())) {
+            RefPtrWillBeRawPtr<InputEvent> beforeInputEvent = InputEvent::createBeforeInput("executeCommand", "");

[chongz, 2016/03/01 20:41:10]

Didn't find a way to get command name from Editor::Command, should I add a name
field to Editor::Command?

[dtapuska, 2016/03/01 21:49:51]

Ya I think you'd want to load it from the EditorInternalCommand class..

+            DispatchEventResult dispatchResult = target->dispatchEvent(beforeInputEvent);
+            if (dispatchResult != DispatchEventResult::NotCanceled)
+                return true;
+        }
+    }
+
     frame().document()->updateLayoutIgnorePendingStylesheets();
     DEFINE_STATIC_LOCAL(SparseHistogram, commandHistogram, ("WebCore.Editing.Commands"));
     commandHistogram.sample(m_command->idForUserMetrics);