XKB implementation of Ozone key layout.

ui/events/ozone/layout/xkb/xkb_keyboard_layout_engine.h

+// 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.
+
+#ifndef UI_EVENTS_OZONE_LAYOUT_XKB_XKB_KEYBOARD_LAYOUT_ENGINE_H_
+#define UI_EVENTS_OZONE_LAYOUT_XKB_XKB_KEYBOARD_LAYOUT_ENGINE_H_
+
+#include "base/containers/hash_tables.h"
+#include "base/strings/string16.h"
+#include "ui/events/ozone/layout/events_ozone_layout_export.h"
+#include "ui/events/ozone/layout/keyboard_layout_engine.h"
+#include "ui/events/ozone/layout/xkb/xkb.h"
+
+namespace ui {
+
+#if defined(USE_X11)
+using XkbKeyCode = decltype(XKeyEvent.keycode);
+using XkbFlags = decltype(XKeyEvent.state);
+#else
+using XkbKeyCode = xkb_keycode_t;
+using XkbFlags = xkb_mod_mask_t;
+using XkbKeySym = xkb_keysym_t;
+#endif
+
+class EVENTS_OZONE_LAYOUT_EXPORT XkbKeyCodeConverter {
+ public:
+  XkbKeyCodeConverter();
+  virtual ~XkbKeyCodeConverter();
+  XkbKeyCode InvalidXkbKeyCode() const { return invalid_xkb_keycode_; }
+  virtual XkbKeyCode DomCodeToXkbKeyCode(DomCode dom_code) const = 0;
+
+ protected:
+  XkbKeyCode invalid_xkb_keycode_;
+};
+
+class EVENTS_OZONE_LAYOUT_EXPORT XkbKeyboardLayoutEngine
+    : public KeyboardLayoutEngine {
+ public:
+ public:
+  XkbKeyboardLayoutEngine(const XkbKeyCodeConverter& converter);
+  virtual ~XkbKeyboardLayoutEngine();
+
+  // KeyboardLayoutEngine:
+  virtual bool CanSetCurrentLayout() const override;
+  virtual bool SetCurrentLayoutByName(const std::string& layout_name) override;
+
+  virtual bool UsesISOLevel5Shift() const override;
+  virtual bool UsesAltGr() const override;
+
+  virtual bool Lookup(DomCode dom_code,
+                      int flags,
+                      DomKey* dom_key,
+                      base::char16* character,
+                      KeyboardCode* key_code) const override;
+
+ private:
+#if !defined(USE_X11)
+  // Sets a new XKB keymap, updating object fields.
+  void SetKeymap(xkb_keymap* keymap);
+#endif
+
+  // Returns the XKB modifiers flags corresponding to the given EventFlags.
+  XkbFlags EventFlagsToXkbFlags(int ui_flags) const;
+
+  // Determines the XKB KeySym and character associated with a key.
+  // Returns true on success.
+  bool XkbLookup(XkbKeyCode xkb_keycode,
+                 XkbFlags xkb_flags,
+                 XkbKeySym* xkb_keysym,
+                 base::char16* character) const;
+
+  // Maps DomCode to XkbKeyCode.
+  const XkbKeyCodeConverter& key_code_converter_;
+
+#if !defined(USE_X11)
+  // libxkbcommon uses explicit reference counting for its structures,
+  // so we need to manage them manually rather than with smart pointers.
+  xkb_context* xkb_context_;

[spang, 2014/12/05 20:10:47]

How about doing

// scoped_xkb.h

struct XkbContextDeleter {
  void operator()(xkb_context* context) const;
};

typedef scoped_ptr<xkb_context, XkbContextDeleter> ScopedXkbContextPtr;

// scoped_xkb.cc

void XkbContextDeleter::operator()(xkb_context* context) const {
  xkb_context_unref(context);
}

[kpschoedel, 2014/12/08 19:54:38]

Done.

+  xkb_state* xkb_state_;
+#endif
+
+  // Table for EventFlagsToXkbFlags().
+  struct XkbFlagMapEntry {
+    int ui_flag;
+    XkbFlags xkb_flag;
+  };
+  std::vector<XkbFlagMapEntry> xkb_flag_map_;
+};
+
+}  // namespace ui
+
+#endif  // UI_EVENTS_OZONE_LAYOUT_XKB_XKB_KEYBOARD_LAYOUT_ENGINE_H_