/************************************************************************************************************************************** * Project: discoverpixy * Website: https://github.com/t-moe/discoverpixy * Authors: Aaron Schmocker, Timo Lang * Institution: BFH Bern University of Applied Sciences * File: common/gui/numupdown.c * * Version History: * Date Autor Email SHA Changes * 2015-04-30 timolang@gmail.com 76ea9d8 Added num up down support. * 2015-04-30 timolang@gmail.com b491b78 Made numupdown horizontal * 2015-05-15 timolang@gmail.com 9a16865 Added doxgen comments to filesyste, checkbox, numupdown and screen module. And some minor changes to the other modules. * 2015-05-17 timolang@gmail.com 2d46336 Improved comments in implementation of button, checkbox, numupdown, tft, touch and screen modules/submodules. * **************************************************************************************************************************************/ #include "tft.h" #include "touch.h" #include "button.h" #include "numupdown.h" #include //for sprintf #include //for offsetof macro #include //for abs /* The idea is as follows: * When the user add's a numupdown we create two buttons, one with a plus and one with a minus sign in it * When the user presses one of the buttons we check and increase the value and execute the provided user callback */ #define BASE_COLOR RGB(90,90,90) //Background color for the whole element //Callback which is called when the user presses the "plus" button void button_up_cb(void* button) { //Get the pointer to the numupdown: subtract the offset of the buttonUp member in the struct from the button pointer NUMUPDOWN_STRUCT* element = button - offsetof(NUMUPDOWN_STRUCT, buttonUp); if (element->value < element->max) { //old value lies below the maximum element->value++; //let's increase the value gui_numupdown_update(element); //and redraw everything if (element->callback != NULL) { //the user provided a callback element->callback(element, element->value); //Call the user callback with the new value } } } //Callback which is called when the user presses the "minus" button void button_down_cb(void* button) { //Get the pointer to the numupdown: subtract the offset of the buttonDown member in the struct from the button pointer NUMUPDOWN_STRUCT* element = button - offsetof(NUMUPDOWN_STRUCT, buttonDown); if (element->value > element->min) { //old value lies above the minimum element->value--; //let's decrease the value gui_numupdown_update(element); //and redraw everything if (element->callback != NULL) { //the user provided a callback element->callback(element, element->value); //Call the user callback with the new value } } } //Method to calculate the number of characters needed to print the provided number in decimal notation (with optional sign) static uint8_t calc_text_width(int16_t val) { uint8_t width = 1 + (val < 0); //1 if positive, 2 if negative (to let space for sign) val = abs(val); //Make the number positive while (val >= 10) { //while we have two or more digits val /= 10; //remove one digit width++; //add one character } return width; } bool gui_numupdown_add(NUMUPDOWN_STRUCT* numupdown) { if (touch_have_empty(2)) { //Check if the touch module can handle two additional areas if (numupdown->min > numupdown->max) { //min is bigger than max? return false; //invalid parameter } if (numupdown->value < numupdown->min) { //value is smaller than min? numupdown->value = numupdown->min; //normalize value } else if (numupdown->value > numupdown->max) { //value is bigger than max? numupdown->value = numupdown->max; //normalize value } uint8_t tw1 = calc_text_width(numupdown->max); //Calculate character width to render maximum value uint8_t tw2 = calc_text_width(numupdown->min); //Calculate character width to render minimum value if (tw2 > tw1) { tw1 = tw2; //ensure tw1 contains the larger number of the two } uint8_t width = tft_font_width(0) * (tw1 + 1); //Calculate width of the number area //Add "minus" button to the left side of the number area numupdown->buttonDown.base.x1 = numupdown->x; numupdown->buttonDown.base.y1 = numupdown->y; numupdown->buttonDown.base.x2 = AUTO; numupdown->buttonDown.base.y2 = numupdown->y + tft_font_height(0) * 2; numupdown->buttonDown.text = "-"; numupdown->buttonDown.font = 0; numupdown->buttonDown.bgcolor = BASE_COLOR; numupdown->buttonDown.txtcolor = WHITE; numupdown->buttonDown.callback = button_down_cb; gui_button_add(&numupdown->buttonDown); //Add "plus" button to the right side of the number area numupdown->buttonUp.base.x1 = numupdown->buttonDown.base.x2 + width + 2; numupdown->buttonUp.base.y1 = numupdown->y; numupdown->buttonUp.base.x2 = AUTO; numupdown->buttonUp.base.y2 = numupdown->y + tft_font_height(0) * 2; numupdown->buttonUp.text = "+"; numupdown->buttonUp.font = 0; numupdown->buttonUp.bgcolor = BASE_COLOR; numupdown->buttonUp.txtcolor = WHITE; numupdown->buttonUp.callback = button_up_cb; gui_button_add(&numupdown->buttonUp); //Draw background and label of the number area tft_fill_rectangle(numupdown->buttonDown.base.x2 + 2, numupdown->y, numupdown->buttonDown.base.x2 + width, numupdown->buttonUp.base.y2, BASE_COLOR); tft_print_formatted(numupdown->buttonDown.base.x2 + 2 + tft_font_width(0) / 2, numupdown->y + tft_font_height(0) / 2, numupdown->fgcolor, BASE_COLOR, 0, "%*d", tw1, numupdown->value); return true; } return false; //not enough touch areas left } void gui_numupdown_remove(NUMUPDOWN_STRUCT* numupdown) { //remove the two buttons, we have no other allocated resources gui_button_remove(&numupdown->buttonUp); gui_button_remove(&numupdown->buttonDown); } void gui_numupdown_redraw(NUMUPDOWN_STRUCT* numupdown) { //redraw the two buttons gui_button_redraw(&numupdown->buttonUp); gui_button_redraw(&numupdown->buttonDown); //call update method which will take care of the number-area rendering gui_numupdown_update(numupdown); } void gui_numupdown_update(NUMUPDOWN_STRUCT* numupdown) { //Calculate the number area width again (see above) uint8_t tw1 = calc_text_width(numupdown->max); uint8_t tw2 = calc_text_width(numupdown->min); if (tw2 > tw1) { tw1 = tw2; } uint8_t width = tft_font_width(0) * (tw1 + 1); //Draw background and label of the number area tft_fill_rectangle(numupdown->buttonDown.base.x2 + 2, numupdown->y, numupdown->buttonDown.base.x2 + width, numupdown->buttonUp.base.y2, BASE_COLOR); tft_print_formatted(numupdown->buttonDown.base.x2 + 2 + tft_font_width(0) / 2, numupdown->y + tft_font_height(0) / 2, numupdown->fgcolor, BASE_COLOR, 0, "%*d", tw1, numupdown->value); }