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