Android rayshader sample.

samples/android_sample/jni/eventloop.cc

+#include "jni/eventloop.h"
+#include "bin/log.h"
+
+EventLoop::EventLoop(android_app* application)
+    : enabled_(false),
+      quit_(false),
+      application_(application),
+      activity_handler_(NULL),
+      input_handler_(NULL) {
+  application_->onAppCmd = ActivityCallback;
+  application_->onInputEvent = InputCallback;
+  application_->userData = this;
+}
+
+void EventLoop::Run(ActivityHandler* activity_handler,
+                    Context* context) {
+  int32_t result;
+  int32_t events;
+  android_poll_source* source;
+
+  app_dummy();
+  activity_handler_ = activity_handler;
+  input_handler_ = context->input_handler;
+  Log::Print("Starting event loop");
+  while (true) {
+    // If not enabled, block on events. If enabled, don't block
+    // so we can do useful work in onStep.
+    while ((result = ALooper_pollAll(enabled_ ? 0 : -1,
+                                     NULL,
+                                     &events,
+                                     reinterpret_cast<void**>(&source))) >= 0) {
+      if (source != NULL) {
+        source->process(application_, source);
+      }
+      if (application_->destroyRequested) {
+        return;
+      }
+    }
+    if (enabled_ && !quit_) {
+      Log::Print("step");
+      if (activity_handler_->OnStep() != 0) {
+        quit_ = true;
+        ANativeActivity_finish(application_->activity);
+      }
+    }
+  }
+}
+
+// Called when we gain focus.
+void EventLoop::Activate() {
+  Log::Print("activate");
+  if (!enabled_ && application_->window != NULL) {
+    quit_ = false;
+    enabled_ = true;
+    if (activity_handler_->OnActivate() != 0) {
+      quit_ = true;
+      ANativeActivity_finish(application_->activity);
+    }
+  }
+}
+
+// Called when we lose focus.
+void EventLoop::Deactivate() {
+  Log::Print("deactivate");
+  if (enabled_) {
+    activity_handler_->OnDeactivate();
+    enabled_ = false;
+  }
+}
+
+void EventLoop::ProcessActivityEvent(int32_t command) {
+  switch (command) {
+    case APP_CMD_CONFIG_CHANGED:
+      activity_handler_->OnConfigurationChanged();
+      break;
+    case APP_CMD_INIT_WINDOW:
+      activity_handler_->OnCreateWindow();
+      break;
+    case APP_CMD_DESTROY:
+      activity_handler_->OnDestroy();
+      break;
+    case APP_CMD_GAINED_FOCUS:
+      Activate();
+      activity_handler_->OnGainedFocus();
+      break;
+    case APP_CMD_LOST_FOCUS:
+      activity_handler_->OnLostFocus();
+      Deactivate();
+      break;
+    case APP_CMD_LOW_MEMORY:
+      activity_handler_->OnLowMemory();
+      break;
+    case APP_CMD_PAUSE:
+      activity_handler_->OnPause();
+      Deactivate();
+      break;
+    case APP_CMD_RESUME:
+      activity_handler_->OnResume();
+      break;
+    case APP_CMD_SAVE_STATE:
+      activity_handler_->OnSaveState(&application_->savedState,
+                                    &application_->savedStateSize);
+      break;
+    case APP_CMD_START:
+      activity_handler_->OnStart();
+      break;
+    case APP_CMD_STOP:
+      activity_handler_->OnStop();
+      break;
+    case APP_CMD_TERM_WINDOW:
+      activity_handler_->OnDestroyWindow();
+      Deactivate();
+      break;
+    default:
+      break;
+  }
+}
+
+int32_t EventLoop::ProcessInputEvent(AInputEvent* event) {
+  int32_t event_type = AInputEvent_getType(event);
+  Log::Print("Got input event type %d", event_type);
+  switch (event_type) {
+    case AINPUT_EVENT_TYPE_MOTION:
+      if (AInputEvent_getSource(event) == AINPUT_SOURCE_TOUCHSCREEN) {
+          return input_handler_->OnTouchEvent(event);
+      }
+      break;
+    case AINPUT_EVENT_TYPE_KEY:
+      return input_handler_->OnKeyEvent(event);
+  }
+  return 0;
+}
+
+void EventLoop::ActivityCallback(android_app* application, int32_t command) {
+  EventLoop* event_loop = reinterpret_cast<EventLoop*>(application->userData);
+  event_loop->ProcessActivityEvent(command);
+}
+
+int32_t EventLoop::InputCallback(android_app* application,
+                                 AInputEvent* event) {
+  EventLoop* event_loop = reinterpret_cast<EventLoop*>(application->userData);
+  return event_loop->ProcessInputEvent(event);
+}
+