249 lines
8.5 KiB
C
249 lines
8.5 KiB
C
#include <stdio.h>
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#include <string.h>
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#include "pax_gfx.h"
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#include "menu.h"
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menu_t* menu_alloc(const char* aTitle) {
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if (aTitle == NULL) return NULL;
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menu_t* menu = malloc(sizeof(menu_t));
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if (menu == NULL) return NULL;
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size_t titleSize = strlen(aTitle) + 1;
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menu->title = malloc(titleSize);
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if (menu->title == NULL) {
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free(menu);
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return NULL;
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}
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memcpy(menu->title, aTitle, titleSize);
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menu->firstItem = NULL;
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menu->length = 0;
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menu->position = 0;
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return menu;
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}
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void _menu_free_item(menu_item_t* aMenuItem) {
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free(aMenuItem->label);
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free(aMenuItem);
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}
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void menu_free(menu_t* aMenu) {
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if (aMenu == NULL) return;
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free(aMenu->title);
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menu_item_t* currentItem = aMenu->firstItem;
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while (currentItem != NULL) {
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menu_item_t* nextItem = currentItem->nextItem;
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_menu_free_item(currentItem);
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currentItem = nextItem;
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}
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free(aMenu);
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}
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menu_item_t* _menu_find_item(menu_t* aMenu, size_t aPosition) {
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menu_item_t* currentItem = aMenu->firstItem;
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if (currentItem == NULL) return NULL;
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size_t index = 0;
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while (index < aPosition) {
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if (currentItem->nextItem == NULL) break;
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currentItem = currentItem->nextItem;
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index++;
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}
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return currentItem;
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}
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menu_item_t* _menu_find_last_item(menu_t* aMenu) {
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menu_item_t* lastItem = aMenu->firstItem;
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if (lastItem == NULL) return NULL;
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while (lastItem->nextItem != NULL) {
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lastItem = lastItem->nextItem;
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}
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return lastItem;
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}
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bool menu_insert_item(menu_t* aMenu, const char* aLabel, menu_callback_t aCallback, void* aCallbackArgs, size_t aPosition) {
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if (aMenu == NULL) return false;
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menu_item_t* newItem = malloc(sizeof(menu_item_t));
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if (newItem == NULL) return false;
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size_t labelSize = strlen(aLabel) + 1;
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newItem->label = malloc(labelSize);
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if (newItem->label == NULL) {
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free(newItem);
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return NULL;
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}
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memcpy(newItem->label, aLabel, labelSize);
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newItem->callback = aCallback;
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newItem->callbackArgs = aCallbackArgs;
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if (aMenu->firstItem == NULL) {
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newItem->nextItem = NULL;
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newItem->previousItem = NULL;
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aMenu->firstItem = newItem;
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} else {
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if (aPosition >= aMenu->length) {
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newItem->previousItem = _menu_find_last_item(aMenu);
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newItem->nextItem = NULL;
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newItem->previousItem->nextItem = newItem;
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} else {
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newItem->nextItem = _menu_find_item(aMenu, aPosition);
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newItem->previousItem = newItem->nextItem->previousItem; // Copy pointer to previous item to new item
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if (newItem->nextItem != NULL) newItem->nextItem->previousItem = newItem; // Replace pointer to previous item with new item
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if (newItem->previousItem != NULL) newItem->previousItem->nextItem = newItem; // Replace pointer to next item in previous item
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}
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}
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aMenu->length++;
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return true;
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}
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bool menu_remove_item(menu_t* aMenu, size_t aPosition) {
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if (aMenu == NULL) return false; // Can't delete an item from a menu that doesn't exist
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if (aMenu->length <= aPosition) return false; // Can't delete an item that doesn't exist
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menu_item_t* item;
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if (aPosition == 0) {
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item = aMenu->firstItem;
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if (item == NULL) return false; // Can't delete if no linked list is allocated
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if (item->nextItem != NULL) {
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aMenu->firstItem = item->nextItem;
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aMenu->firstItem->previousItem = NULL;
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} else {
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aMenu->firstItem = NULL;
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}
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} else {
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item = _menu_find_item(aMenu, aPosition);
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if (item == NULL) return false;
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if (item->previousItem != NULL) item->previousItem->nextItem = item->nextItem;
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if (item->nextItem != NULL) item->nextItem->previousItem = item->previousItem;
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}
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free(item->label);
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free(item);
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aMenu->length--;
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return true;
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}
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bool menu_navigate_to(menu_t* aMenu, size_t aPosition) {
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if (aMenu == NULL) return false;
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if (aMenu->length < 1) return false;
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aMenu->position = aPosition;
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if (aMenu->position >= aMenu->length) aMenu->position = aMenu->length - 1;
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return true;
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}
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void menu_navigate_previous(menu_t* aMenu) {
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if (aMenu == NULL) return;
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if (aMenu->length < 1) return;
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aMenu->position--;
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if (aMenu->position > aMenu->length) {
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aMenu->position = aMenu->length - 1;
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}
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}
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void menu_navigate_next(menu_t* aMenu) {
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if (aMenu == NULL) return;
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if (aMenu->length < 1) return;
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aMenu->position = (aMenu->position + 1) % aMenu->length;
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}
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size_t menu_get_position(menu_t* aMenu) {
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return aMenu->position;
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}
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size_t menu_get_length(menu_t* aMenu) {
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return aMenu->length;
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}
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void* menu_get_callback_args(menu_t* aMenu, size_t aPosition) {
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menu_item_t* item = _menu_find_item(aMenu, aPosition);
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if (item == NULL) return NULL;
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return item->callbackArgs;
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}
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void menu_debug(menu_t* aMenu) {
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if (aMenu == NULL) {
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printf("Menu pointer is NULL\n");
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return;
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}
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printf("Title: %s\n", aMenu->title);
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printf("Length: %u\n", aMenu->length);
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printf("Position: %u\n", aMenu->position);
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menu_item_t* item = aMenu->firstItem;
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if (item == NULL) {
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printf("Menu contains no items\n");
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} else {
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while (item != NULL) {
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printf("> %s\n", item->label);
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item = item->nextItem;
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}
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}
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printf("------\n");
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}
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void menu_render(pax_buf_t *aBuffer, menu_t* aMenu, float aPosX, float aPosY, float aWidth, float aHeight, pax_col_t aColor) {
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pax_col_t fgColor = aColor;
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pax_col_t bgColor = 0xFFFFFFFF;
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pax_col_t bgTextColor = 0xFFFFFFFF;
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pax_col_t borderColor = 0x88000000;
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pax_col_t titleColor = 0xFFFFFFFF;
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pax_col_t titleBgColor = aColor;
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pax_col_t scrollbarBgColor = 0xFFCCCCCC;
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pax_col_t scrollbarFgColor = 0xFF555555;
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float entry_height = 18 + 2;
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size_t maxItems = aHeight / entry_height;
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float posY = aPosY;
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pax_noclip(aBuffer);
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if (maxItems > 1) {
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maxItems--;
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pax_simple_rect(aBuffer, titleBgColor, aPosX, posY, aWidth, entry_height);
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pax_simple_line(aBuffer, titleColor, aPosX + 1, aPosY + entry_height, aPosX + aWidth - 2, aPosY + entry_height - 1);
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pax_clip(aBuffer, aPosX + 1, posY + 1, aWidth - 2, entry_height - 2);
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pax_draw_text(aBuffer, titleColor, NULL, entry_height - 2, aPosX + 1, posY + 1, aMenu->title);
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pax_noclip(aBuffer);
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posY += entry_height;
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}
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size_t itemOffset = 0;
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if (aMenu->position >= maxItems) {
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itemOffset = aMenu->position - maxItems + 1;
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}
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pax_outline_rect(aBuffer, borderColor, aPosX, aPosY, aWidth, aHeight);
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pax_simple_rect(aBuffer, bgColor, aPosX, posY, aWidth, aHeight - posY + aPosY);
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for (size_t index = itemOffset; (index < itemOffset + maxItems) && (index < aMenu->length); index++) {
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menu_item_t* item = _menu_find_item(aMenu, index);
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if (item == NULL) {
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printf("Render error: item is NULL at %u\n", index);
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break;
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}
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if (index == aMenu->position) {
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pax_simple_rect(aBuffer, fgColor, aPosX + 1, posY, aWidth - 2, entry_height);
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pax_clip(aBuffer, aPosX + 1, posY + 1, aWidth - 4, entry_height - 2);
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pax_draw_text(aBuffer, bgTextColor, NULL, entry_height - 2, aPosX + 1, posY + 1, item->label);
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pax_noclip(aBuffer);
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} else {
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pax_simple_rect(aBuffer, bgColor, aPosX + 1, posY, aWidth - 2, entry_height);
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pax_clip(aBuffer, aPosX + 1, posY + 1, aWidth - 4, entry_height - 2);
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pax_draw_text(aBuffer, fgColor, NULL, entry_height - 2, aPosX + 1, posY + 1, item->label);
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pax_noclip(aBuffer);
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}
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posY += entry_height;
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}
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pax_clip(aBuffer, aPosX + aWidth - 5, aPosY + entry_height, 4, aHeight - 1 - entry_height);
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float fractionStart = itemOffset / (aMenu->length * 1.0);
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float fractionSelected = aMenu->position / (aMenu->length * 1.0);
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float fractionEnd = (itemOffset + maxItems) / (aMenu->length * 1.0);
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if (fractionEnd > 1.0) fractionEnd = 1.0;
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float scrollbarHeight = aHeight - entry_height;
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float scrollbarStart = scrollbarHeight * fractionStart;
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float scrollbarEnd = scrollbarHeight * fractionEnd;
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pax_simple_rect(aBuffer, scrollbarBgColor, aPosX + aWidth - 5, aPosY + entry_height - 1, 4, scrollbarHeight);
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pax_simple_rect(aBuffer, scrollbarFgColor, aPosX + aWidth - 5, aPosY + entry_height - 1 + scrollbarStart, 4, scrollbarEnd - scrollbarStart);
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pax_noclip(aBuffer);
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}
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