IME (input method editor) support for Aura, part 3 of 3: Use ui::InputMethod in ash.

ui/aura/desktop_host_linux.cc

Index: ui/aura/desktop_host_linux.cc
diff --git a/ui/aura/desktop_host_linux.cc b/ui/aura/desktop_host_linux.cc
index 7e9a5b110b073e12983307923cc62f8c27c31b27..7abfa4cd65d596eaba78cb0ad0bcc872d282ac71 100644
--- a/ui/aura/desktop_host_linux.cc
+++ b/ui/aura/desktop_host_linux.cc
@@ -12,11 +12,13 @@
 
 #include <algorithm>
 
+#include "base/event_types.h"
 #include "base/message_loop.h"
 #include "base/message_pump_x.h"
 #include "ui/aura/cursor.h"
 #include "ui/aura/desktop.h"
 #include "ui/aura/event.h"
+#include "ui/base/ime/input_method_delegate.h"
 #include "ui/base/keycodes/keyboard_codes.h"
 #include "ui/base/touch/touch_factory.h"
 #include "ui/base/x/x11_util.h"
@@ -26,6 +28,12 @@
 #include <X11/extensions/XInput2.h>
 #include <X11/Xlib.h>
 
+#if defined(HAVE_IBUS)
+#include "ui/base/ime/input_method_ibus.h"
+#else
+#include "ui/base/ime/mock_input_method.h"
+#endif
+
 using std::max;
 using std::min;
 
@@ -181,48 +189,8 @@ int CoalescePendingXIMotionEvents(const XEvent* xev, XEvent* last_event) {
   return num_coalesed;
 }
 
-// We emulate Windows' WM_KEYDOWN and WM_CHAR messages.  WM_CHAR events are only
-// generated for certain keys; see
-// http://msdn.microsoft.com/en-us/library/windows/desktop/ms646268.aspx.
-bool ShouldSendCharEventForKeyboardCode(ui::KeyboardCode keycode) {
-  if ((keycode >= ui::VKEY_0 && keycode <= ui::VKEY_9) ||
-      (keycode >= ui::VKEY_A && keycode <= ui::VKEY_Z) ||
-      (keycode >= ui::VKEY_NUMPAD0 && keycode <= ui::VKEY_NUMPAD9)) {
-    return true;
-  }
-
-  switch (keycode) {
-    case ui::VKEY_BACK:
-    case ui::VKEY_RETURN:
-    case ui::VKEY_ESCAPE:
-    case ui::VKEY_SPACE:
-    case ui::VKEY_TAB:
-    // In addition to the keys listed at MSDN, we include other
-    // graphic-character and numpad keys.
-    case ui::VKEY_MULTIPLY:
-    case ui::VKEY_ADD:
-    case ui::VKEY_SUBTRACT:
-    case ui::VKEY_DECIMAL:
-    case ui::VKEY_DIVIDE:
-    case ui::VKEY_OEM_1:
-    case ui::VKEY_OEM_2:
-    case ui::VKEY_OEM_3:
-    case ui::VKEY_OEM_4:
-    case ui::VKEY_OEM_5:
-    case ui::VKEY_OEM_6:
-    case ui::VKEY_OEM_7:
-    case ui::VKEY_OEM_102:
-    case ui::VKEY_OEM_PLUS:
-    case ui::VKEY_OEM_COMMA:
-    case ui::VKEY_OEM_MINUS:
-    case ui::VKEY_OEM_PERIOD:
-      return true;
-    default:
-      return false;
-  }
-}
-
-class DesktopHostLinux : public DesktopHost {
+class DesktopHostLinux : public DesktopHost,
+                         public ui::internal::InputMethodDelegate {
  public:
   explicit DesktopHostLinux(const gfx::Rect& bounds);
   virtual ~DesktopHostLinux();
@@ -242,6 +210,12 @@ class DesktopHostLinux : public DesktopHost {
   virtual void SetCursor(gfx::NativeCursor cursor_type) OVERRIDE;
   virtual gfx::Point QueryMouseLocation() OVERRIDE;
   virtual void PostNativeEvent(const base::NativeEvent& event) OVERRIDE;
+  virtual ui::InputMethod* GetInputMethod() OVERRIDE;
+
+  // ui::internal::InputMethodDelegate Override.
+  virtual void DispatchKeyEventPostIME(const base::NativeEvent& event) OVERRIDE;
+  virtual void DispatchFabricatedKeyEventPostIME(
+      ui::EventType type, ui::KeyboardCode key_code, int flags) OVERRIDE;
 
   // Returns true if there's an X window manager present... in most cases.  Some
   // window managers (notably, ion3) don't implement enough of ICCCM for us to
@@ -254,6 +228,13 @@ class DesktopHostLinux : public DesktopHost {
   Display* xdisplay_;
   ::Window xwindow_;
 
+  // The input method for the desktop.
+#if defined(HAVE_IBUS)
+  ui::InputMethodIBus input_method_;
+#else
+  ui::MockInputMethod input_method_;
+#endif
+
   // Current Aura cursor.
   gfx::NativeCursor current_cursor_;
 
@@ -267,6 +248,7 @@ DesktopHostLinux::DesktopHostLinux(const gfx::Rect& bounds)
     : desktop_(NULL),
       xdisplay_(base::MessagePumpX::GetDefaultXDisplay()),
       xwindow_(0),
+      ALLOW_THIS_IN_INITIALIZER_LIST(input_method_(this)),
       current_cursor_(aura::kCursorNull),
       bounds_(bounds) {
   xwindow_ = XCreateSimpleWindow(xdisplay_, DefaultRootWindow(xdisplay_),
@@ -274,7 +256,7 @@ DesktopHostLinux::DesktopHostLinux(const gfx::Rect& bounds)
                                  bounds.width(), bounds.height(),
                                  0, 0, 0);
 
-  long event_mask = ButtonPressMask | ButtonReleaseMask |
+  long event_mask = ButtonPressMask | ButtonReleaseMask | FocusChangeMask |
                     KeyPressMask | KeyReleaseMask |
                     ExposureMask | VisibilityChangeMask |
                     StructureNotifyMask | PropertyChangeMask |
@@ -287,6 +269,8 @@ DesktopHostLinux::DesktopHostLinux(const gfx::Rect& bounds)
   if (base::MessagePumpForUI::HasXInput2())
     ui::TouchFactory::GetInstance()->SetupXI2ForXWindow(xwindow_);
 #endif
+
+  input_method_.Init(xwindow_);
 }
 
 DesktopHostLinux::~DesktopHostLinux() {
@@ -304,19 +288,10 @@ base::MessagePumpDispatcher::DispatchStatus DesktopHostLinux::Dispatch(
       desktop_->Draw();
       handled = true;
       break;
-    case KeyPress: {
-      KeyEvent keydown_event(xev, false);
-      handled = desktop_->DispatchKeyEvent(&keydown_event);
-      if (ShouldSendCharEventForKeyboardCode(keydown_event.key_code())) {
-        KeyEvent char_event(xev, true);
-        handled |= desktop_->DispatchKeyEvent(&char_event);
-      }
-      break;
-    }
+    case KeyPress:
     case KeyRelease: {
-      KeyEvent keyup_event(xev, false);
-      handled = desktop_->DispatchKeyEvent(&keyup_event);
-      break;
+      input_method_.DispatchKeyEvent(xev);
+      handled = true;
     }
     case ButtonPress:
     case ButtonRelease: {
@@ -388,6 +363,14 @@ base::MessagePumpDispatcher::DispatchStatus DesktopHostLinux::Dispatch(
         XFreeEventData(xev->xgeneric.display, &last_event.xcookie);
       break;
     }
+    case FocusIn: {
+      input_method_.OnFocus();
+      break;
+    }
+    case FocusOut: {
+      input_method_.OnBlur();
+      break;
+    }
     case MapNotify: {
       // If there's no window manager running, we need to assign the X input
       // focus to our host window.
@@ -527,6 +510,23 @@ bool DesktopHostLinux::IsWindowManagerPresent() {
   return XGetSelectionOwner(xdisplay_, wm_s0_atom) != None;
 }
 
+ui::InputMethod* DesktopHostLinux::GetInputMethod() {
+  return &input_method_;
+}
+
+void DesktopHostLinux::DispatchKeyEventPostIME(const base::NativeEvent& event) {
+  KeyEvent aura_event(event, false /* is_char */);
+  desktop_->DispatchKeyEvent(&aura_event);
+  // We don't send a Char event here since the input method takes care of it.
+}
+
+void DesktopHostLinux::DispatchFabricatedKeyEventPostIME(
+    ui::EventType type, ui::KeyboardCode key_code, int flags) {
+  // Dispatch a ui::VKEY_PROCESSKEY event etc. generated by |input_method_|.
+  KeyEvent aura_event(type, key_code, flags);
+  desktop_->DispatchKeyEvent(&aura_event);
+}
+
 }  // namespace
 
 // static