Convert sticky keys to a chromeos::EventRewriter phase.

chrome/browser/chromeos/events/event_rewriter.cc

 // Copyright 2014 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 "chrome/browser/chromeos/events/event_rewriter.h"
 
 #include <vector>
 
+#include "ash/sticky_keys/sticky_keys_controller.h"
 #include "ash/wm/window_state.h"
 #include "ash/wm/window_util.h"
 #include "base/command_line.h"
 #include "base/logging.h"
+#include "base/macros.h"
 #include "base/prefs/pref_service.h"
 #include "base/strings/string_util.h"
 #include "base/sys_info.h"
 #include "chrome/browser/chromeos/login/ui/login_display_host_impl.h"
 #include "chrome/browser/chromeos/login/users/user_manager.h"
 #include "chrome/browser/profiles/profile_manager.h"
 #include "chrome/common/pref_names.h"
 #include "chromeos/chromeos_switches.h"
 #include "chromeos/ime/ime_keyboard.h"
 #include "chromeos/ime/input_method_manager.h"
@@ skipping 125 matching lines @@
     if (ui_flags & flags[i].ui)
       *x_flags |= flags[i].x;
     else
       *x_flags &= ~flags[i].x;
   }
 }
 #endif
 
 }  // namespace
 
-EventRewriter::EventRewriter()
+EventRewriter::EventRewriter(ash::StickyKeysController* sticky_keys_controller)
     : last_device_id_(kBadDeviceId),
       ime_keyboard_for_testing_(NULL),
-      pref_service_for_testing_(NULL) {
+      pref_service_for_testing_(NULL),
+      sticky_keys_controller_(sticky_keys_controller) {
 #if defined(USE_X11)
   ui::PlatformEventSource::GetInstance()->AddPlatformEventObserver(this);
   if (base::SysInfo::IsRunningOnChromeOS()) {
     XInputHierarchyChangedEventListener::GetInstance()->AddObserver(this);
   }
 #endif
 }
 
 EventRewriter::~EventRewriter() {
 #if defined(USE_X11)
@@ skipping 18 matching lines @@
 ui::EventRewriteStatus EventRewriter::RewriteEvent(
     const ui::Event& event,
     scoped_ptr<ui::Event>* rewritten_event) {
 #if defined(USE_X11)
   // Do not rewrite an event sent by ui_controls::SendKeyPress(). See
   // crbug.com/136465.
   XEvent* xev = event.native_event();
   if (xev && xev->xany.send_event)
     return ui::EVENT_REWRITE_CONTINUE;
 #endif
-  switch (event.type()) {
-    case ui::ET_KEY_PRESSED:
-    case ui::ET_KEY_RELEASED:
-      return RewriteKeyEvent(static_cast<const ui::KeyEvent&>(event),
+  if ((event.type() == ui::ET_KEY_PRESSED) ||
+      (event.type() == ui::ET_KEY_RELEASED)) {
+    return RewriteKeyEvent(static_cast<const ui::KeyEvent&>(event),
+                           rewritten_event);
+  }
+  if (event.IsMouseEvent()) {
+    return RewriteMouseEvent(static_cast<const ui::MouseEvent&>(event),
                              rewritten_event);
-    case ui::ET_MOUSE_PRESSED:
-    case ui::ET_MOUSE_RELEASED:
-      return RewriteMouseEvent(static_cast<const ui::MouseEvent&>(event),
-                               rewritten_event);
-    case ui::ET_TOUCH_PRESSED:
-    case ui::ET_TOUCH_RELEASED:
-      return RewriteTouchEvent(static_cast<const ui::TouchEvent&>(event),
-                               rewritten_event);
-    default:
-      return ui::EVENT_REWRITE_CONTINUE;
   }
-  NOTREACHED();
+  if ((event.type() == ui::ET_TOUCH_PRESSED) ||
+      (event.type() == ui::ET_TOUCH_RELEASED)) {
+    return RewriteTouchEvent(static_cast<const ui::TouchEvent&>(event),
+                             rewritten_event);
+  }
+  if (event.IsScrollEvent()) {
+    return RewriteScrollEvent(static_cast<const ui::ScrollEvent&>(event),
+                              rewritten_event);
+  }
+  return ui::EVENT_REWRITE_CONTINUE;
 }
 
 ui::EventRewriteStatus EventRewriter::NextDispatchEvent(
     const ui::Event& last_event,
     scoped_ptr<ui::Event>* new_event) {
+  if (sticky_keys_controller_) {
+    // In the case of sticky keys, we know what the events obtained here are:
+    // modifier key releases that match the ones previously discarded. So, we
+    // know that they don't have to be passed through the post-sticky key
+    // rewriting phases, |RewriteExtendedKeys()| and |RewriteFunctionKeys()|,
+    // because those phases do nothing with modifier key releases.
+    return sticky_keys_controller_->NextDispatchEvent(new_event);
+  }
   NOTREACHED();
   return ui::EVENT_REWRITE_CONTINUE;
 }
 
 #if defined(USE_X11)
 void EventRewriter::DeviceKeyPressedOrReleased(int device_id) {
   if (!device_id_to_type_.count(device_id)) {
     // |device_id| is unknown. This means the device was connected before
     // booting the OS. Query the name of the device and add it to the map.
     DeviceAdded(device_id);
@@ skipping 96 matching lines @@
   }
   return false;
 }
 
 ui::EventRewriteStatus EventRewriter::RewriteKeyEvent(
     const ui::KeyEvent& key_event,
     scoped_ptr<ui::Event>* rewritten_event) {
   MutableKeyState state = {key_event.flags(), key_event.key_code()};
   RewriteModifierKeys(key_event, &state);
   RewriteNumPadKeys(key_event, &state);
+  ui::EventRewriteStatus status = ui::EVENT_REWRITE_CONTINUE;
+  if (sticky_keys_controller_) {
+    status = sticky_keys_controller_->RewriteKeyEvent(
+        key_event, state.key_code, &state.flags);
+    if (status == ui::EVENT_REWRITE_DISCARD)
+      return ui::EVENT_REWRITE_DISCARD;
+  }
   RewriteExtendedKeys(key_event, &state);
   RewriteFunctionKeys(key_event, &state);
   if ((key_event.flags() == state.flags) &&
-      (key_event.key_code() == state.key_code)) {
+      (key_event.key_code() == state.key_code) &&
+      (status == ui::EVENT_REWRITE_CONTINUE)) {
     return ui::EVENT_REWRITE_CONTINUE;
   }
+  // Sticky keys may have returned a result other than |EVENT_REWRITE_CONTINUE|,
+  // in which case we need to preserve that return status. Alternatively, we
+  // might be here because key_event changed, in which case we need to return
+  // |EVENT_REWRITE_REWRITTEN|.
+  if (status == ui::EVENT_REWRITE_CONTINUE)
+    status = ui::EVENT_REWRITE_REWRITTEN;
   ui::KeyEvent* rewritten_key_event = new ui::KeyEvent(key_event);
   rewritten_event->reset(rewritten_key_event);
   rewritten_key_event->set_flags(state.flags);
   rewritten_key_event->set_key_code(state.key_code);
   rewritten_key_event->set_character(
       ui::GetCharacterFromKeyCode(state.key_code, state.flags));
   rewritten_key_event->NormalizeFlags();
 #if defined(USE_X11)
   XEvent* xev = rewritten_key_event->native_event();
   if (xev) {
     CHECK(xev->type == KeyPress || xev->type == KeyRelease);
     XKeyEvent* xkey = &(xev->xkey);
     UpdateX11EventMask(rewritten_key_event->flags(), &xkey->state);
     xkey->keycode =
         XKeysymToKeycode(gfx::GetXDisplay(),
                          ui::XKeysymForWindowsKeyCode(
                              state.key_code, state.flags & ui::EF_SHIFT_DOWN));
   }
 #endif
-  return ui::EVENT_REWRITE_REWRITTEN;
+  return status;
 }
 
 ui::EventRewriteStatus EventRewriter::RewriteMouseEvent(
     const ui::MouseEvent& mouse_event,
     scoped_ptr<ui::Event>* rewritten_event) {
   int flags = mouse_event.flags();
-  RewriteLocatedEvent(mouse_event, &flags);
-  if (mouse_event.flags() == flags)
+  if ((mouse_event.type() == ui::ET_MOUSE_PRESSED) ||
+      (mouse_event.type() == ui::ET_MOUSE_RELEASED)) {
+    RewriteLocatedEvent(mouse_event, &flags);
+  }
+  ui::EventRewriteStatus status = ui::EVENT_REWRITE_CONTINUE;
+  if (sticky_keys_controller_)
+    status = sticky_keys_controller_->RewriteMouseEvent(mouse_event, &flags);
+  if ((mouse_event.flags() == flags) &&
+      (status == ui::EVENT_REWRITE_CONTINUE)) {
     return ui::EVENT_REWRITE_CONTINUE;
+  }
+  if (status == ui::EVENT_REWRITE_CONTINUE)
+    status = ui::EVENT_REWRITE_REWRITTEN;
   ui::MouseEvent* rewritten_mouse_event = new ui::MouseEvent(mouse_event);
   rewritten_event->reset(rewritten_mouse_event);
   rewritten_mouse_event->set_flags(flags);
 #if defined(USE_X11)
   XEvent* xev = rewritten_mouse_event->native_event();
   if (xev) {
     switch (xev->type) {
       case ButtonPress:
       case ButtonRelease: {
         XButtonEvent* xbutton = &(xev->xbutton);
         UpdateX11EventMask(rewritten_mouse_event->flags(), &xbutton->state);
         break;
       }
       case GenericEvent: {
         XIDeviceEvent* xievent = static_cast<XIDeviceEvent*>(xev->xcookie.data);
         CHECK(xievent->evtype == XI_ButtonPress ||
               xievent->evtype == XI_ButtonRelease);
         UpdateX11EventMask(
             rewritten_mouse_event->flags(),
             reinterpret_cast<unsigned int*>(&xievent->mods.effective));
         break;
       }
       default:
         NOTREACHED();
     }
   }
 #endif
-  return ui::EVENT_REWRITE_REWRITTEN;
+  return status;
 }
 
 ui::EventRewriteStatus EventRewriter::RewriteTouchEvent(
     const ui::TouchEvent& touch_event,
     scoped_ptr<ui::Event>* rewritten_event) {
   int flags = touch_event.flags();
   RewriteLocatedEvent(touch_event, &flags);
   if (touch_event.flags() == flags)
     return ui::EVENT_REWRITE_CONTINUE;
   ui::TouchEvent* rewritten_touch_event = new ui::TouchEvent(touch_event);
   rewritten_event->reset(rewritten_touch_event);
   rewritten_touch_event->set_flags(flags);
 #if defined(USE_X11)
   XEvent* xev = rewritten_touch_event->native_event();
   if (xev) {
     XIDeviceEvent* xievent = static_cast<XIDeviceEvent*>(xev->xcookie.data);
     if (xievent) {
       UpdateX11EventMask(
           rewritten_touch_event->flags(),
           reinterpret_cast<unsigned int*>(&xievent->mods.effective));
     }
   }
 #endif
   return ui::EVENT_REWRITE_REWRITTEN;
 }
 
+ui::EventRewriteStatus EventRewriter::RewriteScrollEvent(
+    const ui::ScrollEvent& scroll_event,
+    scoped_ptr<ui::Event>* rewritten_event) {
+  int flags = scroll_event.flags();
+  ui::EventRewriteStatus status = ui::EVENT_REWRITE_CONTINUE;
+  if (sticky_keys_controller_)
+    status = sticky_keys_controller_->RewriteScrollEvent(scroll_event, &flags);
+  if (status == ui::EVENT_REWRITE_CONTINUE)
+    return status;
+  ui::ScrollEvent* rewritten_scroll_event = new ui::ScrollEvent(scroll_event);
+  rewritten_event->reset(rewritten_scroll_event);
+  rewritten_scroll_event->set_flags(flags);
+#if defined(USE_X11)
+  XEvent* xev = rewritten_scroll_event->native_event();
+  if (xev) {
+    XIDeviceEvent* xievent = static_cast<XIDeviceEvent*>(xev->xcookie.data);
+    if (xievent) {
+      UpdateX11EventMask(
+          rewritten_scroll_event->flags(),
+          reinterpret_cast<unsigned int*>(&xievent->mods.effective));
+    }
+  }
+#endif
+  return status;
+}
+
 void EventRewriter::RewriteModifierKeys(const ui::KeyEvent& key_event,
                                         MutableKeyState* state) {
   DCHECK(key_event.type() == ui::ET_KEY_PRESSED ||
          key_event.type() == ui::ET_KEY_RELEASED);
 
   // Do nothing if we have just logged in as guest but have not restarted chrome
   // process yet (so we are still on the login screen). In this situations we
   // have no user profile so can not do anything useful.
   // Note that currently, unlike other accounts, when user logs in as guest, we
   // restart chrome process. In future this is to be changed.
@@ skipping 377 matching lines @@
 
   XIFreeDeviceInfo(device_info);
 }
 
 void EventRewriter::DeviceRemoved(int device_id) {
   device_id_to_type_.erase(device_id);
 }
 #endif
 
 }  // namespace chromeos