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Unified Diff: ui/events/ozone/layout/keyboard_layout_engine.h

Issue 742103002: Ozone keyboard layout (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@lite-code
Patch Set: address review comments (Wez) + cleanup Created 6 years ago
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Index: ui/events/ozone/layout/keyboard_layout_engine.h
diff --git a/ui/events/ozone/layout/keyboard_layout_engine.h b/ui/events/ozone/layout/keyboard_layout_engine.h
new file mode 100644
index 0000000000000000000000000000000000000000..21b46b0d969f0b35da92bb19c7467c1527efb91d
--- /dev/null
+++ b/ui/events/ozone/layout/keyboard_layout_engine.h
@@ -0,0 +1,66 @@
+// 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_OZONE_PUBLIC_KEYBOARD_LAYOUT_ENGINE_H_
+#define UI_OZONE_PUBLIC_KEYBOARD_LAYOUT_ENGINE_H_
+
+#include <string>
+
+#include "base/strings/string16.h"
+#include "ui/events/keycodes/keyboard_codes.h"
+#include "ui/events/ozone/layout/events_ozone_layout_export.h"
+
+namespace ui {
+
+enum class DomCode;
+enum class DomKey;
+
+// A KeyboardLayoutEngine provides a platform-independent interface to
+// key mapping. Key mapping provides a meaning (DomKey and character,
+// and optionally Windows key code) for a physical key press (DomCode
+// and modifier flags).
+//
+// The interface must support platforms that only provide a single opaque
+// system layout, so there is no standalone 'KeyboardLayout' object.
+class EVENTS_OZONE_LAYOUT_EXPORT KeyboardLayoutEngine {
+ public:
+ KeyboardLayoutEngine() {}
+ virtual ~KeyboardLayoutEngine() {}
+
+ // Returns true if it is possible to change the current layout.
+ virtual bool CanSetCurrentLayout() const = 0;
+
+ // Sets the current layout; returns true on success.
+ virtual bool SetCurrentLayoutByName(const std::string& layout_name) = 0;
+
+ // Returns true if the current layout makes use of the ISO Level 5 Shift key.
+ virtual bool UsesISOLevel5Shift() const = 0;
+
+ // Returns true if the current layout makes use of the AltGr
+ // (ISO Level 3 Shift) key.
+ virtual bool UsesAltGr() const = 0;
+
+ // Provides the meaning of a physical key.
+ //
+ // The caller must supply valid addresses for all the output parameters;
+ // the function must not use their initial values.
+ //
+ // Returns true if it can determine the meaning of the (dom_code, flags)
+ // values, OR if it can determine that they have no meaning in the current
+ // layout (e.g. the key is unbound). In the latter case, the function sets
+ // *dom_key to UNIDENTIFIED, *character to 0, and *key_code to VKEY_UNKNOWN.
+ //
+ // Returns false if it cannot determine the meaning (and cannot determine
+ // that there is none); in this case it does not set any of the output
+ // parameters.
+ virtual bool Lookup(DomCode dom_code,
+ int flags,
+ DomKey* dom_key,
+ base::char16* character,
+ KeyboardCode* key_code) const = 0;
+};
+
+} // namespace ui
+
+#endif // UI_OZONE_PUBLIC_KEYBOARD_LAYOUT_ENGINE_H_

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