1 files changed, 83 insertions, 0 deletions
diff --git a/src/input.cpp b/src/input.cpp
new file mode 100644
index 0000000..21959c1
--- /dev/null
+++ b/src/input.cpp
@@ -0,0 +1,83 @@
+/**
+ * @file input.cpp
+ * Handles user input received from SDL.
+ *
+ * Copyright (C) 2020 Clyne Sullivan
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "input.hpp"
+
+#include "components/EventListener.hpp"
+#include "components/Script.hpp"
+
+InputSystem::InputSystem() :
+    isMouseDown(false) {}
+
+/**
+ * Prepares the system for running.
+ */
+void InputSystem::configure([[maybe_unused]] entityx::EntityManager& entities,
+                            [[maybe_unused]] entityx::EventManager& events) {}
+
+/**
+ * Updates the system by checking for SDL events.
+ */
+void InputSystem::update(entityx::EntityManager& entities,
+            entityx::EventManager& events,
+            [[maybe_unused]] entityx::TimeDelta dt)
+{
+    for (SDL_Event event; SDL_PollEvent(&event);) {
+        switch (event.type) {
+        case SDL_KEYUP:
+            if (auto key = event.key; key.repeat == 0)
+                events.emit<KeyUpEvent>(key.keysym);
+            break;
+        case SDL_KEYDOWN:
+            if (auto key = event.key; key.repeat == 0)
+                events.emit<KeyDownEvent>(key.keysym);
+            break;
+        case SDL_MOUSEBUTTONDOWN:
+            if (!isMouseDown) {
+                isMouseDown = true;
+                entities.each<EventListener>(
+                    [&event](entityx::Entity e, EventListener& el) {
+                        el.tryListener("MousePressed",
+                            e.component<Scripted>()->caller,
+                            event.button.x,
+                            event.button.y,
+                            event.button.button);
+                    });
+            }
+            break;
+        case SDL_MOUSEBUTTONUP:
+            if (isMouseDown) {
+                isMouseDown = false;
+                entities.each<EventListener>(
+                    [&event](entityx::Entity e, EventListener& el) {
+                        el.tryListener("MouseReleased",
+                            e.component<Scripted>()->caller,
+                            event.button.x,
+                            event.button.y,
+                            event.button.button);
+                    });
+            }
+            break;
+        default:
+            break;
+        }
+    }
+}
+