[feat] mouse/keyboard control and screen capture supported by using X11 on Linux platform

src/device_controller/keyboard/linux/keyboard_capturer.cpp

@@ -1,15 +1,69 @@
 #include "keyboard_capturer.h"
 
-KeyboardCapturer::KeyboardCapturer() {}
+#include "keyboard_converter.h"
+#include "rd_log.h"
 
-KeyboardCapturer::~KeyboardCapturer() {}
+static OnKeyAction g_on_key_action = nullptr;
+static void* g_user_ptr = nullptr;
 
-int KeyboardCapturer::Hook(OnKeyAction on_key_action, void *user_ptr) {
+static int KeyboardEventHandler(Display* display, XEvent* event) {
+  if (event->xkey.type == KeyPress || event->xkey.type == KeyRelease) {
+    KeySym keySym = XKeycodeToKeysym(display, event->xkey.keycode, 0);
+    int key_code = XKeysymToKeycode(display, keySym);
+    bool is_key_down = (event->xkey.type == KeyPress);
+
+    if (g_on_key_action) {
+      g_on_key_action(key_code, is_key_down, g_user_ptr);
+    }
+  }
   return 0;
 }
 
-int KeyboardCapturer::Unhook() { return 0; }
+KeyboardCapturer::KeyboardCapturer() : display_(nullptr), running_(true) {
+  display_ = XOpenDisplay(nullptr);
+  if (!display_) {
+    LOG_ERROR("Failed to open X display.");
+  }
+}
+
+KeyboardCapturer::~KeyboardCapturer() {
+  if (display_) {
+    XCloseDisplay(display_);
+  }
+}
+
+int KeyboardCapturer::Hook(OnKeyAction on_key_action, void* user_ptr) {
+  g_on_key_action = on_key_action;
+  g_user_ptr = user_ptr;
+
+  XSelectInput(display_, DefaultRootWindow(display_),
+               KeyPressMask | KeyReleaseMask);
+
+  while (running_) {
+    XEvent event;
+    XNextEvent(display_, &event);
+    KeyboardEventHandler(display_, &event);
+  }
+
+  return 0;
+}
+
+int KeyboardCapturer::Unhook() {
+  running_ = false;
+  return 0;
+}
 
 int KeyboardCapturer::SendKeyboardCommand(int key_code, bool is_down) {
+  if (!display_) {
+    LOG_ERROR("Display not initialized.");
+    return -1;
+  }
+
+  if (vkCodeToX11KeySym.find(key_code) != vkCodeToX11KeySym.end()) {
+    int x11_key_code = vkCodeToX11KeySym[key_code];
+    KeyCode keycode = XKeysymToKeycode(display_, x11_key_code);
+    XTestFakeKeyEvent(display_, keycode, is_down, CurrentTime);
+    XFlush(display_);
+  }
   return 0;
-}
+}