InputCommon: add Keyboard

src/input_common/CMakeLists.txt

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+set(SRCS
+            keyboard.cpp
+            main.cpp
+            )
+
+set(HEADERS
+            keyboard.h
+            main.h
+            )
+
+create_directory_groups(${SRCS} ${HEADERS})
+
+add_library(input_common STATIC ${SRCS} ${HEADERS})
+target_link_libraries(input_common common core)
+

src/input_common/keyboard.cpp

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+// Copyright 2017 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include <atomic>
+#include <list>
+#include <mutex>
+#include "input_common/keyboard.h"
+
+namespace InputCommon {
+
+class KeyButton final : public Input::ButtonDevice {
+public:
+    explicit KeyButton(std::shared_ptr<KeyButtonList> key_button_list_)
+        : key_button_list(key_button_list_) {}
+
+    ~KeyButton();
+
+    bool GetStatus() const override {
+        return status.load();
+    }
+
+    friend class KeyButtonList;
+
+private:
+    std::shared_ptr<KeyButtonList> key_button_list;
+    std::atomic<bool> status{false};
+};
+
+struct KeyButtonPair {
+    int key_code;
+    KeyButton* key_button;
+};
+
+class KeyButtonList {
+public:
+    void AddKeyButton(int key_code, KeyButton* key_button) {
+        std::lock_guard<std::mutex> guard(mutex);
+        list.push_back(KeyButtonPair{key_code, key_button});
+    }
+
+    void RemoveKeyButton(const KeyButton* key_button) {
+        std::lock_guard<std::mutex> guard(mutex);
+        list.remove_if(
+            [key_button](const KeyButtonPair& pair) { return pair.key_button == key_button; });
+    }
+
+    void ChangeKeyStatus(int key_code, bool pressed) {
+        std::lock_guard<std::mutex> guard(mutex);
+        for (const KeyButtonPair& pair : list) {
+            if (pair.key_code == key_code)
+                pair.key_button->status.store(pressed);
+        }
+    }
+
+private:
+    std::mutex mutex;
+    std::list<KeyButtonPair> list;
+};
+
+Keyboard::Keyboard() : key_button_list{std::make_shared<KeyButtonList>()} {}
+
+KeyButton::~KeyButton() {
+    key_button_list->RemoveKeyButton(this);
+}
+
+std::unique_ptr<Input::ButtonDevice> Keyboard::Create(const Common::ParamPackage& params) {
+    int key_code = params.Get("code", 0);
+    std::unique_ptr<KeyButton> button = std::make_unique<KeyButton>(key_button_list);
+    key_button_list->AddKeyButton(key_code, button.get());
+    return std::move(button);
+}
+
+void Keyboard::PressKey(int key_code) {
+    key_button_list->ChangeKeyStatus(key_code, true);
+}
+
+void Keyboard::ReleaseKey(int key_code) {
+    key_button_list->ChangeKeyStatus(key_code, false);
+}
+
+} // namespace InputCommon

src/input_common/keyboard.h

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+// Copyright 2017 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <memory>
+#include "core/frontend/input.h"
+
+namespace InputCommon {
+
+class KeyButtonList;
+
+/**
+ * A button device factory representing a keyboard. It receives keyboard events and forward them
+ * to all button devices it created.
+ */
+class Keyboard final : public Input::Factory<Input::ButtonDevice> {
+public:
+    Keyboard();
+
+    /**
+     * Creates a button device from a keyboard key
+     * @param params contains parameters for creating the device:
+     *     - "code": the code of the key to bind with the button
+     */
+    std::unique_ptr<Input::ButtonDevice> Create(const Common::ParamPackage& params) override;
+
+    /**
+     * Sets the status of all buttons bound with the key to pressed
+     * @param key_code the code of the key to press
+     */
+    void PressKey(int key_code);
+
+    /**
+     * Sets the status of all buttons bound with the key to released
+     * @param key_code the code of the key to release
+     */
+    void ReleaseKey(int key_code);
+
+private:
+    std::shared_ptr<KeyButtonList> key_button_list;
+};
+
+} // namespace InputCommon

src/input_common/main.cpp

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+// Copyright 2017 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include <memory>
+#include "common/param_package.h"
+#include "input_common/keyboard.h"
+#include "input_common/main.h"
+
+namespace InputCommon {
+
+static std::shared_ptr<Keyboard> keyboard;
+
+void Init() {
+    keyboard = std::make_shared<InputCommon::Keyboard>();
+    Input::RegisterFactory<Input::ButtonDevice>("keyboard", keyboard);
+}
+
+void Shutdown() {
+    Input::UnregisterFactory<Input::ButtonDevice>("keyboard");
+    keyboard.reset();
+}
+
+Keyboard* GetKeyboard() {
+    return keyboard.get();
+}
+
+std::string GenerateKeyboardParam(int key_code) {
+    Common::ParamPackage param{
+        {"engine", "keyboard"}, {"code", std::to_string(key_code)},
+    };
+    return param.Serialize();
+}
+
+} // namespace InputCommon

src/input_common/main.h

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+// Copyright 2017 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <string>
+
+namespace InputCommon {
+
+/// Initializes and registers all built-in input device factories.
+void Init();
+
+/// Unresisters all build-in input device factories and shut them down.
+void Shutdown();
+
+class Keyboard;
+
+/// Gets the keyboard button device factory.
+Keyboard* GetKeyboard();
+
+/// Generates a serialized param package for creating a keyboard button device
+std::string GenerateKeyboardParam(int key_code);
+
+} // namespace InputCommon