Handling PNaCl KeyboardInputEvent(s) in the key tester app.

remoting/tools/javascript_key_tester/pnacl/remoting_key_tester.cc

+// Copyright (c) 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include <sstream>
+
+#include "ppapi/cpp/input_event.h"
+#include "ppapi/cpp/instance.h"
+#include "ppapi/cpp/module.h"
+#include "ppapi/cpp/var.h"
+
+namespace remoting {
+
+class KeyTesterInstance : public pp::Instance {
+ public:
+  explicit KeyTesterInstance(PP_Instance instance) : pp::Instance(instance) {
+    RequestInputEvents(PP_INPUTEVENT_CLASS_KEYBOARD |
+                       PP_INPUTEVENT_CLASS_MOUSE);
+  }
+
+  virtual ~KeyTesterInstance() {}
+
+  virtual bool HandleInputEvent(const pp::InputEvent& event) {
+    switch (event.GetType()) {
+      case PP_INPUTEVENT_TYPE_KEYDOWN:
+      case PP_INPUTEVENT_TYPE_KEYUP:
+      case PP_INPUTEVENT_TYPE_CHAR: {
+        HandleKeyboardEvent(pp::KeyboardInputEvent(event));
+        break;
+      }
+      default:
+        break;
+    }
+    return true;
+  }
+
+ private:
+  void HandleKeyboardEvent(const pp::KeyboardInputEvent& event) {
+    std::ostringstream out;
+
+    out << EventTypeToString(event.GetType()) << " : ";
+    out << ModifiersToString(event.GetModifiers()) << " : ";
+    out << "0x" << std::hex << event.GetKeyCode() << " : ";
+    out << VarToString(event.GetCharacterText()) << " : ";
+    out << VarToString(event.GetCode());
+
+    PostMessage(out.str());

[Jamie, 2015/01/28 22:31:27]

I think this should be passed as a dictionary (or a JSON-encoded one if it has
to be a string) so that the JS code can format it in the same way that the it
does for the JS key events. You don't need to make the UI pretty in this CL (as
you say, we can iterate on that), but I think it does makes sense to get the API
right. It will also help to keep the C++ code really simple, which is good from
a standpoint of providing it as a minimal repro case.

[Łukasz Anforowicz, 2015/01/29 00:26:37]

I wrote code that works and passes the following object to javascript ...
 * @typedef {{type: string,
 *            modifiers: number,
 *            keyCode: number,
 *            characterText: string,
 *            code: string}}
... but then I started having second thoughts.

I think I still prefer passing strings, rather than objects:
*) strings are copy&pasteable (i.e. to share tester's output in an email)
*) current chord_tracker.js is written around keydown/keyup events.  I am wary
of trying to recreate such objects out of PNaCl's data.
*) strings are more versatile - can represent both keyboard and touch events; 
if we want to cover touch events in the future, then it is probably easiest to
recognized them and translate to strings in C++/PNaCl layer, rather than having
to deal with recognizing and formatting different kinds of objects in
javascript)

+  }
+
+  std::string VarToString(const pp::Var& var) {
+    if (var.is_undefined()) {
+      return "[undefined]";
+    }
+    if (var.is_null()) {
+      return "[null]";
+    }
+    if (!var.is_string()) {
+      return "[non-string]";
+    }
+    return var.AsString();
+  }
+
+  std::string EventTypeToString(PP_InputEvent_Type t) {
+    switch (t) {
+      case PP_INPUTEVENT_TYPE_UNDEFINED:
+        return "UNDEFINED";
+      case PP_INPUTEVENT_TYPE_MOUSEDOWN:
+        return "MOUSEDOWN";
+      case PP_INPUTEVENT_TYPE_MOUSEUP:
+        return "MOUSEUP";
+      case PP_INPUTEVENT_TYPE_MOUSEMOVE:
+        return "MOUSEMOVE";
+      case PP_INPUTEVENT_TYPE_MOUSEENTER:
+        return "MOUSEENTER";
+      case PP_INPUTEVENT_TYPE_MOUSELEAVE:
+        return "MOUSELEAVE";
+      case PP_INPUTEVENT_TYPE_WHEEL:
+        return "WHEEL";
+      case PP_INPUTEVENT_TYPE_RAWKEYDOWN:
+        return "RAWKEYDOWN";
+      case PP_INPUTEVENT_TYPE_KEYDOWN:
+        return "KEYDOWN";
+      case PP_INPUTEVENT_TYPE_KEYUP:
+        return "KEYUP";
+      case PP_INPUTEVENT_TYPE_CHAR:
+        return "CHAR";
+      case PP_INPUTEVENT_TYPE_CONTEXTMENU:
+        return "CONTEXTMENU";
+      case PP_INPUTEVENT_TYPE_IME_COMPOSITION_START:
+        return "IME_COMPOSITION_START";
+      case PP_INPUTEVENT_TYPE_IME_COMPOSITION_UPDATE:
+        return "IME_COMPOSITION_UPDATE";
+      case PP_INPUTEVENT_TYPE_IME_COMPOSITION_END:
+        return "IME_COMPOSITION_END";
+      case PP_INPUTEVENT_TYPE_IME_TEXT:
+        return "IME_TEXT";
+      case PP_INPUTEVENT_TYPE_TOUCHSTART:
+        return "TOUCHSTART";
+      case PP_INPUTEVENT_TYPE_TOUCHMOVE:
+        return "TOUCHMOVE";
+      case PP_INPUTEVENT_TYPE_TOUCHEND:
+        return "TOUCHEND";
+      case PP_INPUTEVENT_TYPE_TOUCHCANCEL:
+        return "TOUCHCANCEL";
+      default:
+        return "[UNRECOGNIZED]";
+    }
+  }
+
+  void Append(std::ostringstream& out,
+              const std::string& str,
+              const std::string& separator) {
+    if (!out.str().empty()) {
+      out << separator;
+    }
+    out << str;
+  }
+
+  std::string ModifiersToString(uint32_t modifiers) {
+    std::ostringstream out;
+    if (modifiers & PP_INPUTEVENT_MODIFIER_SHIFTKEY) {
+      Append(out, "SHIFTKEY", "+");
+    }
+    if (modifiers & PP_INPUTEVENT_MODIFIER_CONTROLKEY) {
+      Append(out, "CONTROLKEY", "+");
+    }
+    if (modifiers & PP_INPUTEVENT_MODIFIER_ALTKEY) {
+      Append(out, "ALTKEY", "+");
+    }
+    if (modifiers & PP_INPUTEVENT_MODIFIER_METAKEY) {
+      Append(out, "METAKEY", "+");
+    }
+    if (modifiers & PP_INPUTEVENT_MODIFIER_ISKEYPAD) {
+      Append(out, "ISKEYPAD", "+");
+    }
+    if (modifiers & PP_INPUTEVENT_MODIFIER_ISAUTOREPEAT) {
+      Append(out, "ISAUTOREPEAT", "+");
+    }
+    if (modifiers & PP_INPUTEVENT_MODIFIER_LEFTBUTTONDOWN) {
+      Append(out, "LEFTBUTTONDOWN", "+");
+    }
+    if (modifiers & PP_INPUTEVENT_MODIFIER_MIDDLEBUTTONDOWN) {
+      Append(out, "MIDDLEBUTTONDOWN", "+");
+    }
+    if (modifiers & PP_INPUTEVENT_MODIFIER_RIGHTBUTTONDOWN) {
+      Append(out, "RIGHTBUTTONDOWN", "+");
+    }
+    if (modifiers & PP_INPUTEVENT_MODIFIER_CAPSLOCKKEY) {
+      Append(out, "CAPSLOCKKEY", "+");
+    }
+    if (modifiers & PP_INPUTEVENT_MODIFIER_NUMLOCKKEY) {
+      Append(out, "NUMLOCKKEY", "+");
+    }
+    if (modifiers & PP_INPUTEVENT_MODIFIER_ISLEFT) {
+      Append(out, "ISLEFT", "+");
+    }
+    if (modifiers & PP_INPUTEVENT_MODIFIER_ISRIGHT) {
+      Append(out, "ISRIGHT", "+");
+    }
+    if (out.str().empty()) {
+      return "[NO MODIFIERS]";
+    }
+    return out.str();
+  }
+};
+
+class KeyTesterModule : public pp::Module {
+ public:
+  KeyTesterModule() : pp::Module() {}
+  virtual ~KeyTesterModule() {}
+
+  virtual pp::Instance* CreateInstance(PP_Instance instance) {
+    return new KeyTesterInstance(instance);
+  }
+};
+
+}  // namespace remoting
+
+namespace pp {
+
+Module* CreateModule() {
+  return new remoting::KeyTesterModule();
+}
+
+}  // namespace pp