gfx_readstr.c

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/* gfx hook for INPUT support */

#include "fb_gfx.h"


/*:::::*/
static void move_back(void)
{
        __fb_gfx->cursor_x--;
        if (__fb_gfx->cursor_x < 0) {
                __fb_gfx->cursor_x = __fb_gfx->text_w - 1;
                __fb_gfx->cursor_y--;
        }
}

char *fb_GfxReadStr(char *buffer, ssize_t maxlen)
{
        int key;
        ssize_t len = 0;
        char cursor_normal[2] = { 219, '\0' };
        char cursor_backspace[3] = { 219, ' ', '\0' };
        char space[2] = { ' ', '\0' };
        char character[2] = { 0, '\0' };
        char *cursor = cursor_normal;
        
        if (!__fb_gfx)
                return NULL;
        
        do {
                fb_GfxPrintBuffer(cursor, 0);
                
                if (cursor == cursor_backspace) {
                        move_back();
                        cursor = cursor_normal;
                }
                move_back();
                
                key = fb_Getkey();
                if (key < 0x100) {
                        if (key == 8) {
                                if (len > 0) {
                                        cursor = cursor_backspace;
                                        move_back();
                                        if (__fb_gfx->cursor_y < 0) {
                                                __fb_gfx->cursor_y = __fb_gfx->cursor_x = 0;
                                                cursor = cursor_normal;
                                        }
                                        len--;
                                }
                        }
                        else if ((key != 7) && (len < maxlen - 1)) {
                                if (key == 13) {
                                        fb_GfxPrintBuffer(space, 0);
                                        move_back();
                                }
                                buffer[len++] = key;
                                character[0] = key;
                                fb_GfxPrintBuffer(character, 0);
                        }
                }
        } while (key != 13);
        
        buffer[len] = '\0';
        
        return buffer;
}