From ceb116c41c0b26036599df1fcfb90e7c615eea38 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Vladim=C3=ADr=20Vondru=C5=A1?= <mosra@centrum.cz>
Date: Sat, 4 Aug 2012 19:09:45 +0200
Subject: [PATCH] EglContext: keyboard and mouse handling.

---
 src/Contexts/EglContext.cpp | 24 +++++++++++
 src/Contexts/EglContext.h   | 86 +++++++++++++++++++++++++++++++++++++
 2 files changed, 110 insertions(+)

diff --git a/src/Contexts/EglContext.cpp b/src/Contexts/EglContext.cpp
index e3ab85d74..e66ff5036 100644
--- a/src/Contexts/EglContext.cpp
+++ b/src/Contexts/EglContext.cpp
@@ -17,6 +17,9 @@
 
 #define None 0L // redef Xlib nonsense
 
+/* Mask for X events */
+#define INPUT_MASK KeyPressMask|KeyReleaseMask|ButtonPressMask|ButtonReleaseMask
+
 using namespace std;
 
 namespace Magnum { namespace Contexts {
@@ -98,6 +101,9 @@ EglContext::EglContext(int&, char**, const string& title, const Math::Vector2<GL
         exit(1);
     }
 
+    /* Capture exposure, keyboard and mouse button events */
+    XSelectInput(xDisplay, xWindow, INPUT_MASK);
+
     /* Set OpenGL context as current */
     eglMakeCurrent(display, surface, surface, context);
 
@@ -131,6 +137,24 @@ int EglContext::exec() {
     viewportEvent(viewportSize);
 
     while(true) {
+        XEvent event;
+        while(XCheckWindowEvent(xDisplay, xWindow, INPUT_MASK, &event)) {
+            switch(event.type) {
+                case KeyPress:
+                    keyPressEvent(static_cast<Key>(XLookupKeysym(&event.xkey, 0)), {event.xkey.x, event.xkey.y});
+                    break;
+                case KeyRelease:
+                    keyReleaseEvent(static_cast<Key>(XLookupKeysym(&event.xkey, 0)), {event.xkey.x, event.xkey.y});
+                    break;
+                case ButtonPress:
+                    mousePressEvent(static_cast<MouseButton>(event.xbutton.button), {event.xbutton.x, event.xbutton.y});
+                    break;
+                case ButtonRelease:
+                    mouseReleaseEvent(static_cast<MouseButton>(event.xbutton.button), {event.xbutton.x, event.xbutton.y});
+                    break;
+            }
+        }
+
         /** @todo Handle at least window closing and resizing */
         drawEvent();
     }
diff --git a/src/Contexts/EglContext.h b/src/Contexts/EglContext.h
index fe2e48cb2..b9c4edb57 100644
--- a/src/Contexts/EglContext.h
+++ b/src/Contexts/EglContext.h
@@ -62,6 +62,8 @@ class EglContext: public AbstractContext {
 
         int exec();
 
+        /** @{ @name Drawing functions */
+
     protected:
         /** @copydoc GlutContext::viewportEvent() */
         virtual void viewportEvent(const Math::Vector2<GLsizei>& size) = 0;
@@ -72,6 +74,84 @@ class EglContext: public AbstractContext {
         /** @copydoc GlutContext::swapBuffers() */
         inline void swapBuffers() { eglSwapBuffers(display, surface); }
 
+        /*@}*/
+
+        /** @{ @name Keyboard handling */
+
+    public:
+        /** @brief Key */
+        enum class Key: KeySym {
+            Up = XK_Up,                 /**< Up arrow */
+            Down = XK_Down,             /**< Down arrow */
+            Left = XK_Left,             /**< Left arrow */
+            Right = XK_Right,           /**< Right arrow */
+            F1 = XK_F1,                 /**< F1 */
+            F2 = XK_F2,                 /**< F2 */
+            F3 = XK_F3,                 /**< F3 */
+            F4 = XK_F4,                 /**< F4 */
+            F5 = XK_F5,                 /**< F5 */
+            F6 = XK_F6,                 /**< F6 */
+            F7 = XK_F7,                 /**< F7 */
+            F8 = XK_F8,                 /**< F8 */
+            F9 = XK_F9,                 /**< F9 */
+            F10 = XK_F10,               /**< F10 */
+            F11 = XK_F11,               /**< F11 */
+            F12 = XK_F12,               /**< F12 */
+            Home = XK_Home,             /**< Home */
+            End = XK_End,               /**< End */
+            PageUp = XK_Page_Up,        /**< Page up */
+            PageDown = XK_Page_Down     /**< Page down */
+        };
+
+    protected:
+        /**
+         * @brief Key press event
+         * @param key       Key pressed
+         * @param position  Cursor position
+         *
+         * Called when an key is pressed. Default implementation does nothing.
+         */
+        virtual void keyPressEvent(Key key, const Math::Vector2<int>& position) = 0;
+
+        /**
+         * @brief Key press event
+         * @param key       Key released
+         * @param position  Cursor position
+         *
+         * Called when an key is released. Default implementation does nothing.
+         */
+        virtual void keyReleaseEvent(Key key, const Math::Vector2<int>& position) = 0;
+
+        /*@}*/
+
+        /** @{ @name Mouse handling */
+    public:
+        /** @brief Mouse button */
+        enum class MouseButton: unsigned int {
+            Left = Button1,         /**< Left button */
+            Middle = Button2,       /**< Middle button */
+            Right = Button3,        /**< Right button */
+            WheelUp = Button4,      /**< Wheel up */
+            WheelDown = Button5     /**< Wheel down */
+        };
+
+    protected:
+        /**
+         * @brief Mouse press event
+         *
+         * Called when mouse button is pressed. Default implementation does
+         * nothing.
+         */
+        virtual void mousePressEvent(MouseButton button, const Math::Vector2<int>& position);
+
+        /**
+         * @brief Mouse release event
+         *
+         * Called when mouse button is released. Default implementation does
+         * nothing.
+         */
+        virtual void mouseReleaseEvent(MouseButton button, const Math::Vector2<int>& position);
+
     private:
         Display* xDisplay;
         Window xWindow;
@@ -84,6 +164,12 @@ class EglContext: public AbstractContext {
         Math::Vector2<GLsizei> viewportSize;
 };
 
+inline void EglContext::keyPressEvent(EglContext::Key, const Math::Vector2<int>&) {}
+inline void EglContext::keyReleaseEvent(EglContext::Key, const Math::Vector2<int>&) {}
+inline void EglContext::mousePressEvent(EglContext::MouseButton, const Math::Vector2<int>&) {}
+inline void EglContext::mouseReleaseEvent(EglContext::MouseButton, const Math::Vector2<int>&) {}
+
+
 }}
 
 #endif