From 6de3d16fd3e7d98c98cdf73c6a3317e1a6b10184 Mon Sep 17 00:00:00 2001
From: Adrian Kummerlaender
Date: Sat, 26 May 2018 23:15:02 +0200
Subject: Add KeyWatcher to handle pausing via space

---
 src/glfw/key_watcher.cc | 24 ++++++++++++++++++++++++
 src/glfw/key_watcher.h  | 17 +++++++++++++++++
 src/glfw/window.cc      |  4 ++++
 src/glfw/window.h       |  8 ++++++--
 4 files changed, 51 insertions(+), 2 deletions(-)
 create mode 100644 src/glfw/key_watcher.cc
 create mode 100644 src/glfw/key_watcher.h

(limited to 'src/glfw')

diff --git a/src/glfw/key_watcher.cc b/src/glfw/key_watcher.cc
new file mode 100644
index 0000000..21a570a
--- /dev/null
+++ b/src/glfw/key_watcher.cc
@@ -0,0 +1,24 @@
+#include "key_watcher.h"
+
+KeyWatcher::KeyWatcher(GLFWwindow* handle, int key):
+	_handle(handle),
+	_key(key),
+	_last_state(glfwGetKey(_handle, _key))
+{ }
+
+bool KeyWatcher::wasClicked() {
+	switch ( glfwGetKey(_handle, _key) ) {
+		case GLFW_RELEASE:
+			_last_state = GLFW_RELEASE;
+			return false;
+		case GLFW_PRESS:
+			if ( _last_state == GLFW_RELEASE ) {
+				_last_state = GLFW_PRESS;
+				return true;
+			} else {
+				return false;
+			}
+		default:
+			return false;
+	}
+}
diff --git a/src/glfw/key_watcher.h b/src/glfw/key_watcher.h
new file mode 100644
index 0000000..538829f
--- /dev/null
+++ b/src/glfw/key_watcher.h
@@ -0,0 +1,17 @@
+#pragma once
+
+#include <GLFW/glfw3.h>
+
+class KeyWatcher {
+private:
+	GLFWwindow* const _handle;
+
+	int _key;
+	int _last_state;
+
+public:
+	KeyWatcher(GLFWwindow* handle, int key);
+
+	bool wasClicked();
+
+};
diff --git a/src/glfw/window.cc b/src/glfw/window.cc
index 17fc36c..6fbbfee 100644
--- a/src/glfw/window.cc
+++ b/src/glfw/window.cc
@@ -22,3 +22,7 @@ int Window::getWidth() const {
 int Window::getHeight() const {
 	return _height;
 }
+
+KeyWatcher Window::getKeyWatcher(int key) {
+	return KeyWatcher(_handle, key);
+}
diff --git a/src/glfw/window.h b/src/glfw/window.h
index b858e9a..520b5e8 100644
--- a/src/glfw/window.h
+++ b/src/glfw/window.h
@@ -5,6 +5,8 @@
 #include <GL/glew.h>
 #include <GLFW/glfw3.h>
 
+#include "key_watcher.h"
+
 class Window {
 private:
 	bool _good   = false;
@@ -21,6 +23,8 @@ public:
 	int getWidth() const;
 	int getHeight() const;
 
+	KeyWatcher getKeyWatcher(int key);
+
 	template <class F>
 	void init(F f);
 
@@ -39,8 +43,8 @@ template <class F>
 void Window::render(F loop) {
 	glfwMakeContextCurrent(_handle);
 
-	while ( glfwGetKey(_handle, GLFW_KEY_ESCAPE ) != GLFW_PRESS &&
-			glfwWindowShouldClose(_handle)        == 0 ) {
+	while ( glfwGetKey(_handle, GLFW_KEY_ESCAPE) != GLFW_PRESS &&
+	        glfwWindowShouldClose(_handle)       == 0 ) {
 		glfwGetWindowSize(_handle, &_width, &_height);
 
 		loop();
-- 
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