InputCommon: add Keyboard

src/input_common/keyboard.cpp

@@ -0,0 +1,82 @@
+// 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