console utils

.vscode/settings.json

@@ -0,0 +1,13 @@
+{
+    "files.associations": {
+        "ostream": "cpp",
+        "system_error": "cpp",
+        "array": "cpp",
+        "functional": "cpp",
+        "tuple": "cpp",
+        "type_traits": "cpp",
+        "utility": "cpp",
+        "random": "cpp",
+        "limits": "cpp"
+    }
+}

source/main.cpp

@@ -1,21 +1,49 @@
 #include <3ds.h>
 #include <iostream>
+#include "utilsconsole.hpp"
 
 using namespace std;
 
 int main(void) {;
     gfxInitDefault();
-    consoleInit(GFX_TOP, NULL);
-    bool value = false;
-    while (aptMainLoop()) {
-        hidScanInput();
-        if (hidKeysDown() & KEY_A)
-            value = !value;
+    consoleInit(GFX_BOTTOM, NULL);
 
-        gspWaitForVBlank();
-        GSPGPU_SetLedForceOff(value);
-        gfxFlushBuffers();
-        gfxSwapBuffers();
+    int a = 0;
+    int b = 2;
+    int c = -10;
+    while (aptMainLoop()) {
+        static const s_uc_menu_element menu[] = {
+            {"a", true, &a, 0, 10},
+            {"b", true, &b, 0, 2},
+            {"c", true, &c, -10, 10},
+            {"Show", false, NULL, 0, 0},
+            {"Test quick menu", false, NULL, 0, 0},
+        };
+        static auto menuVec = vector<s_uc_menu_element>(menu, menu + 5);
+        int ans = uc_menu(menuVec);
+        if (ans == 3) {
+            cout << "a: " << a << ", b: " << b << ", c: " << c << endl;
+            uc_pause();
+        }
+        else if (ans == 4) {
+            while (aptMainLoop()) {
+                ans = uc_menu_quick("hello", "hola", "bonjour", "Go back");
+                switch (ans) {
+                case 0:
+                    cout << "bye" << endl;
+                    break;
+                case 1:
+                    cout << "adios" << endl;
+                    break;
+                case 2:
+                    cout << "au revoir" << endl;
+                    break;
+                }
+                if (ans == 3)
+                    break;
+                uc_pause();
+            }
+        }
     }
     gfxExit();
 }

source/utilsconsole.cpp

@@ -0,0 +1,87 @@
+#include <3ds.h>
+#include <iostream>
+#include <stdarg.h>
+#include "utilsconsole.hpp"
+
+int uc_menu(vector<s_uc_menu_element> &elements) {
+    static void *lastElements = NULL;
+    static size_t selected = 0;
+
+    bool confirmed = false;
+
+    if (&elements != lastElements) {
+        // init if new menu
+        consoleClear();
+        lastElements = &elements;
+        selected = 0;
+    }
+    else {
+        // read inputs
+        hidScanInput();
+        if (hidKeysDown() & KEY_UP) {
+            if (selected-- == 0)
+                selected += elements.size();
+        }
+        else if (hidKeysDown() & KEY_DOWN) {
+            if (++selected >= elements.size())
+                selected -= elements.size();
+        }
+        else if (!elements[selected].is_number_prompt) {
+            if (hidKeysDown() & KEY_A) {
+                confirmed = true;
+                lastElements = NULL;
+            }
+        }
+        else {
+            if (hidKeysDown() & KEY_LEFT)
+                if (*elements[selected].value > elements[selected].min)
+                    (*elements[selected].value)--;
+            if (hidKeysDown() & KEY_RIGHT)
+                if (*elements[selected].value < elements[selected].max)
+                    (*elements[selected].value)++;
+        }
+    }
+
+    // display
+    cout << "\e[H\e[0m";
+    for (size_t i = 0; i < elements.size(); i++) {
+        cout << (i == selected && !confirmed ? "\e[7m" : "")
+            << elements[i].name << "\e[0m";
+        if (elements[i].is_number_prompt)
+            cout
+                << ((*(elements[i].value) == elements[i].min) ? "  " : " <")
+                << *(elements[i].value)
+                << ((*(elements[i].value) == elements[i].max) ? " " : ">");
+        cout << "\e[0K" << endl;
+    }
+    if (!confirmed)
+        cout << "\e[2m" << "[Up/Down] Move / "
+            << (elements[selected].is_number_prompt ?
+            "[Left/Right] Modify" : "(A) Confirm") << "\e[0K" << endl;
+    else
+        cout << "\e[2mOK.\e[0K\e[0m" << endl;
+    
+    return confirmed ? selected : -1;
+}
+
+int uc_menu_quick(const char *str, ...) {
+    va_list arguments;
+    auto elements = vector<s_uc_menu_element>();
+    for (va_start(arguments, str); str; str = va_arg(arguments, const char *))
+        elements.push_back({str, false, NULL, 0, 0});
+    
+    int r = -1;
+    while (r < 0 && aptMainLoop())
+        r = uc_menu(elements);
+    return r;
+}
+
+void uc_pause(void) {
+    cout << "\e[0;2mPress (A) to continue...\e[0m" << endl;
+    while (aptMainLoop()) {
+        hidScanInput();
+        if (hidKeysDown() & KEY_A)
+            break;
+        gfxFlushBuffers();
+    }
+}

source/utilsconsole.hpp

@@ -0,0 +1,46 @@
+/**
+ * utilsconsole.hpp (uc_*)
+ * Utility functions for the console.
+ */
+
+#pragma once
+#include <string>
+#include <vector>
+
+using namespace std;
+
+/// @brief To use with uc_menu(): Represent an element of the menu.
+typedef struct { 
+    /// @brief Displayed name.
+    string name;
+    /// @brief true if this button can be used to change the value of a number.
+    bool is_number_prompt;
+    /// @brief Only if is_number_prompt is true: the number to change.
+    int *value;
+    /// @brief Only if is_number_prompt is true: the minimum value possible for
+    ///        value.
+    int min;
+    /// @brief Only if is_number_prompt is true: the maximum value possible for
+    ///        value.
+    int max;
+} s_uc_menu_element;
+
+/// @brief Display a menu with several items in the console.
+/// @details
+/// Non-blocking function, must be called in loop.
+/// Only one menu can work at the same time. 'elements' must not change in
+/// address.
+/// @param elements A pointer to a vector of all the elements of the menu.
+/// @return The index of the confirmed element. If none, return -1.
+int uc_menu(vector<s_uc_menu_element> &elements);
+
+/// @brief Display a menu quickly using only confirm buttons.
+/// @details
+/// Blocking function. Will return -1 if aptMainLoop() becomes false.
+/// @param str Text representing each element. The last parameter must be NULL.
+/// @return The index of the confirmed element.
+int uc_menu_quick(const char *str, ...);
+
+/// @brief Blocks the program until the user presses A.
+/// @details Will also return if aptMainLoop() becomes false.
+void uc_pause(void);