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Add Calculator app (#270)
Add Calculator app Originally created by @maxbrito500 and tweaked/updated by me.
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@ -33,6 +33,7 @@ namespace app {
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namespace addgps { extern const AppManifest manifest; }
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namespace alertdialog { extern const AppManifest manifest; }
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namespace applist { extern const AppManifest manifest; }
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namespace calculator { extern const AppManifest manifest; }
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namespace chat { extern const AppManifest manifest; }
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namespace boot { extern const AppManifest manifest; }
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namespace display { extern const AppManifest manifest; }
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@ -74,6 +75,7 @@ static void registerSystemApps() {
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addApp(app::addgps::manifest);
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addApp(app::alertdialog::manifest);
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addApp(app::applist::manifest);
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addApp(app::calculator::manifest);
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addApp(app::display::manifest);
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addApp(app::files::manifest);
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addApp(app::gpio::manifest);
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230
Tactility/Source/app/calculator/Calculator.cpp
Normal file
230
Tactility/Source/app/calculator/Calculator.cpp
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@ -0,0 +1,230 @@
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#include <Tactility/app/AppManifest.h>
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#include <Tactility/lvgl/Toolbar.h>
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#include <cstdlib>
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#include <cstring>
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#include <lvgl.h>
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#include <queue>
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#include <stack>
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namespace tt::app::calculator {
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constexpr const char* TAG = "Calculator";
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class CalculatorApp : public App {
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lv_obj_t* displayLabel;
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lv_obj_t* resultLabel;
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char formulaBuffer[128] = {0}; // Stores the full input expression
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bool newInput = true;
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static void button_event_cb(lv_event_t* e) {
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CalculatorApp* self = static_cast<CalculatorApp*>(lv_event_get_user_data(e));
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lv_obj_t* btnm = lv_event_get_current_target_obj(e);
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lv_event_code_t code = lv_event_get_code(e);
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uint32_t btn_id = lv_buttonmatrix_get_selected_button(btnm);
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const char* txt = lv_buttonmatrix_get_button_text(btnm, btn_id);
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if (code == LV_EVENT_VALUE_CHANGED) {
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self->handleInput(txt);
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}
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}
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void handleInput(const char* txt) {
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if (std::strcmp(txt, "C") == 0) {
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resetCalculator();
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return;
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}
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if (std::strcmp(txt, "=") == 0) {
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evaluateExpression();
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return;
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}
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if (std::strlen(formulaBuffer) + std::strlen(txt) < sizeof(formulaBuffer) - 1) {
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if (newInput) {
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std::memset(formulaBuffer, 0, sizeof(formulaBuffer));
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newInput = false;
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}
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std::strcat(formulaBuffer, txt);
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lv_label_set_text(displayLabel, formulaBuffer);
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}
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}
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void evaluateExpression() {
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double result = computeFormula();
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size_t formulaLen = std::strlen(formulaBuffer);
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size_t maxAvailable = sizeof(formulaBuffer) - formulaLen - 1;
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if (maxAvailable > 10) {
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char resultBuffer[32];
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snprintf(resultBuffer, sizeof(resultBuffer), " = %.8g", result);
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strncat(formulaBuffer, resultBuffer, maxAvailable);
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} else {
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snprintf(formulaBuffer, sizeof(formulaBuffer), "%.8g", result);
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}
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lv_label_set_text(displayLabel, "0");
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lv_label_set_text(resultLabel, formulaBuffer);
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newInput = true;
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}
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double computeFormula() {
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return evaluateRPN(infixToRPN(std::string(formulaBuffer)));
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}
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int precedence(char op) {
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if (op == '+' || op == '-') return 1;
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if (op == '*' || op == '/') return 2;
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return 0;
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}
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std::queue<std::string> infixToRPN(const std::string& infix) {
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std::stack<char> opStack;
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std::queue<std::string> output;
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std::string token;
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size_t i = 0;
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while (i < infix.size()) {
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char ch = infix[i];
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if (isdigit(ch)) {
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token.clear();
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while (i < infix.size() && (isdigit(infix[i]) || infix[i] == '.')) {
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token += infix[i++];
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}
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output.push(token);
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continue;
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}
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if (ch == '(') {
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opStack.push(ch);
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} else if (ch == ')') {
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while (!opStack.empty() && opStack.top() != '(') {
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output.push(std::string(1, opStack.top()));
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opStack.pop();
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}
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opStack.pop();
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} else if (strchr("+-*/", ch)) {
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while (!opStack.empty() && precedence(opStack.top()) >= precedence(ch)) {
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output.push(std::string(1, opStack.top()));
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opStack.pop();
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}
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opStack.push(ch);
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}
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i++;
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}
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while (!opStack.empty()) {
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output.push(std::string(1, opStack.top()));
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opStack.pop();
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}
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return output;
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}
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double evaluateRPN(std::queue<std::string> rpnQueue) {
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std::stack<double> values;
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while (!rpnQueue.empty()) {
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std::string token = rpnQueue.front();
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rpnQueue.pop();
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if (isdigit(token[0])) {
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values.push(std::stod(token));
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} else if (strchr("+-*/", token[0])) {
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if (values.size() < 2) return 0;
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double b = values.top();
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values.pop();
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double a = values.top();
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values.pop();
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if (token[0] == '+') values.push(a + b);
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else if (token[0] == '-')
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values.push(a - b);
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else if (token[0] == '*')
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values.push(a * b);
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else if (token[0] == '/' && b != 0)
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values.push(a / b);
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}
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}
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return values.empty() ? 0 : values.top();
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}
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void resetCalculator() {
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std::memset(formulaBuffer, 0, sizeof(formulaBuffer));
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lv_label_set_text(displayLabel, "0");
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lv_label_set_text(resultLabel, "");
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newInput = true;
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}
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void onShow(AppContext& context, lv_obj_t* parent) override {
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lv_obj_remove_flag(parent, LV_OBJ_FLAG_SCROLLABLE);
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lv_obj_set_flex_flow(parent, LV_FLEX_FLOW_COLUMN);
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lv_obj_t* toolbar = tt::lvgl::toolbar_create(parent, context);
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lv_obj_align(toolbar, LV_ALIGN_TOP_MID, 0, 0);
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lv_obj_t* wrapper = lv_obj_create(parent);
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lv_obj_set_flex_flow(wrapper, LV_FLEX_FLOW_ROW);
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lv_obj_set_flex_align(wrapper, LV_FLEX_ALIGN_START, LV_FLEX_ALIGN_CENTER, LV_FLEX_ALIGN_START);
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lv_obj_set_width(wrapper, LV_PCT(100));
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lv_obj_set_height(wrapper, LV_SIZE_CONTENT);
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lv_obj_set_flex_grow(wrapper, 0);
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lv_obj_set_style_pad_top(wrapper, 4, LV_PART_MAIN);
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lv_obj_set_style_pad_bottom(wrapper, 4, LV_PART_MAIN);
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lv_obj_set_style_pad_left(wrapper, 10, LV_PART_MAIN);
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lv_obj_set_style_pad_right(wrapper, 10, LV_PART_MAIN);
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lv_obj_set_style_pad_column(wrapper, 40, LV_PART_MAIN);
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lv_obj_set_style_border_width(wrapper, 0, 0);
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lv_obj_remove_flag(wrapper, LV_OBJ_FLAG_SCROLLABLE);
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displayLabel = lv_label_create(wrapper);
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lv_label_set_text(displayLabel, "0");
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lv_obj_set_width(displayLabel, LV_SIZE_CONTENT);
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lv_obj_set_align(displayLabel, LV_ALIGN_LEFT_MID);
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resultLabel = lv_label_create(wrapper);
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lv_label_set_text(resultLabel, "");
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lv_obj_set_width(resultLabel, LV_SIZE_CONTENT);
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lv_obj_set_align(resultLabel, LV_ALIGN_RIGHT_MID);
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static const char* btn_map[] = {
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"(", ")", "C", "/", "\n",
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"7", "8", "9", "*", "\n",
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"4", "5", "6", "-", "\n",
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"1", "2", "3", "+", "\n",
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"0", "=", "", "", ""
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};
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lv_obj_t* btnm = lv_btnmatrix_create(parent);
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lv_btnmatrix_set_map(btnm, btn_map);
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lv_obj_set_style_pad_all(btnm, 5, LV_PART_MAIN);
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lv_obj_set_style_pad_row(btnm, 10, LV_PART_MAIN);
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lv_obj_set_style_pad_column(btnm, 5, LV_PART_MAIN);
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lv_obj_set_style_border_width(btnm, 0, LV_PART_MAIN);
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lv_obj_set_style_border_width(btnm, 0, LV_PART_MAIN);
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if (lv_display_get_horizontal_resolution(nullptr) <= 240 || lv_display_get_vertical_resolution(nullptr) <= 240) { //small screens
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lv_obj_set_size(btnm, lv_pct(100), lv_pct(60));
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} else { //large screens
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lv_obj_set_size(btnm, lv_pct(100), lv_pct(80));
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}
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lv_obj_align(btnm, LV_ALIGN_BOTTOM_MID, 0, -5);
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lv_obj_add_event_cb(btnm, button_event_cb, LV_EVENT_VALUE_CHANGED, this);
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}
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};
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extern const AppManifest manifest = {
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.id = "Calculator",
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.name = "Calculator",
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.createApp = create<CalculatorApp>
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};
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} // namespace tt::app::calculator
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