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MXC-A36/xrz/lv_drivers/indev/mousewheel.c

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+/**
+ * @file mousewheel.c
+ *
+ */
+
+/*********************
+ *      INCLUDES
+ *********************/
+#include "mousewheel.h"
+#if USE_MOUSEWHEEL
+
+/*********************
+ *      DEFINES
+ *********************/
+
+/**********************
+ *      TYPEDEFS
+ **********************/
+
+/**********************
+ *  STATIC PROTOTYPES
+ **********************/
+
+/**********************
+ *  STATIC VARIABLES
+ **********************/
+static int16_t enc_diff = 0;
+static lv_indev_state_t state = LV_INDEV_STATE_RELEASED;
+
+/**********************
+ *      MACROS
+ **********************/
+
+/**********************
+ *   GLOBAL FUNCTIONS
+ **********************/
+
+/**
+ * Initialize the mousewheel
+ */
+void mousewheel_init(void)
+{
+    /*Nothing to init*/
+}
+
+/**
+ * Get encoder (i.e. mouse wheel) ticks difference and pressed state
+ * @param indev_drv pointer to the related input device driver
+ * @param data store the read data here
+ */
+void mousewheel_read(lv_indev_drv_t * indev_drv, lv_indev_data_t * data)
+{
+    (void) indev_drv;      /*Unused*/
+
+    data->state = state;
+    data->enc_diff = enc_diff;
+    enc_diff = 0;
+}
+
+/**
+ * It is called periodically from the SDL thread to check mouse wheel state
+ * @param event describes the event
+ */
+void mousewheel_handler(SDL_Event * event)
+{
+    switch(event->type) {
+        case SDL_MOUSEWHEEL:
+            // Scroll down (y = -1) means positive encoder turn,
+            // so invert it
+#ifdef __EMSCRIPTEN__
+            /*Escripten scales it wrong*/
+            if(event->wheel.y < 0) enc_diff++;
+            if(event->wheel.y > 0) enc_diff--;
+#else
+            enc_diff = -event->wheel.y;
+#endif
+            break;
+        case SDL_MOUSEBUTTONDOWN:
+            if(event->button.button == SDL_BUTTON_MIDDLE) {
+                state = LV_INDEV_STATE_PRESSED;
+            }
+            break;
+        case SDL_MOUSEBUTTONUP:
+            if(event->button.button == SDL_BUTTON_MIDDLE) {
+                state = LV_INDEV_STATE_RELEASED;
+            }
+            break;
+        default:
+            break;
+    }
+}
+
+/**********************
+ *   STATIC FUNCTIONS
+ **********************/
+
+#endif