MeowOS-SDK/meow_ui_ime.c

/*
 * meow_ui_ime.c — 内置触屏软键盘（B1.6）。仅英文 QWERTY / 数字，ASCII。
 *
 * 阻塞：meow_ui_text_input(ctx) 弹出键盘，自绘自分发直到确认(enter)/取消(esc|背景)。
 * 非阻塞：meow_ui_text_input_async(ctx) 打开后返回；meow_ui_run 在 on_tick 间隙
 * 随帧绘制并拦截触摸，app 用 meow_ime_active()/meow_ime_text() 轮询。
 *
 * 键盘覆盖屏幕底部约 300px；点按输入；键位 44×36（touch target 达标）。
 */
#include "meow_ui.h"
#include "meow_ui_internal.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <unistd.h>

#define IME_MAXKEYS 96
#define KB_TOP      420      /* 面板顶（预览行起点） */
#define GW          44       /* 键宽 */
#define GH          36       /* 键高 */
#define GAP         4        /* 键间距 */
#define GCOL        48       /* 列步进 = GW+GAP */

typedef enum { K_CH, K_SHIFT, K_SPACE, K_BACK, K_ENTER, K_ESC } kkind;

struct kbkey { int x, y, w, h; kkind kind; char ch; };

static struct kbkey g_keys[IME_MAXKEYS];
static int g_nkeys = 0;

static int g_ime_active = 0;
static int g_ime_done = 0;
static int g_ime_result = 0;
static int g_shift = 0;

static meow_ime_ctx g_ime_ctx;            /* 拷贝（on_change 回调用） */
static meow_ime_ctx *g_ime_orig = NULL;   /* 应用真实 ctx（buf 回填用） */
static char g_ime_buf[256];
static int g_maxlen = 255;

/* ---- 布局 ---- */
static void add_key(int x, int y, int w, int h, kkind k, char ch)
{
    if (g_nkeys >= IME_MAXKEYS) return;
    g_keys[g_nkeys].x = x; g_keys[g_nkeys].y = y;
    g_keys[g_nkeys].w = w; g_keys[g_nkeys].h = h;
    g_keys[g_nkeys].kind = k; g_keys[g_nkeys].ch = ch;
    g_nkeys++;
}

/* 加入一行居中字符键；返回该行开始 x */
static void add_ch_row(int y, const char *chars)
{
    int n = (int)strlen(chars);
    int total = n * GW + (n - 1) * GAP;
    int x = (480 - total) / 2;
    for (int i = 0; i < n; i++) add_key(x + i * GCOL, y, GW, GH, K_CH, chars[i]);
}

static void build_kb(meow_ime_mode mode)
{
    g_nkeys = 0;
    int y = KB_TOP + 50;
    if (mode == MEOW_IME_ASCII) {
        add_ch_row(y, "1234567890");
        add_ch_row(y + GCOL, "QWERTYUIOP");
        /* 第 3 行：9 字母 + SHIFT */
        {
            const char *r = "ASDFGHJKL";
            int n = (int)strlen(r);
            int total = 10 * GW + 9 * GAP;
            int x = (480 - total) / 2;
            for (int i = 0; i < n; i++) add_key(x + i * GCOL, y + GCOL * 2, GW, GH, K_CH, r[i]);
            add_key(x + 9 * GCOL, y + GCOL * 2, GW, GH, K_SHIFT, '^');
        }
        /* 第 4 行：7 字母 + BACKSPACE */
        {
            const char *r = "ZXCVBNM";
            int n = (int)strlen(r);
            int total = 10 * GW + 9 * GAP;
            int x = (480 - total) / 2;
            for (int i = 0; i < n; i++) add_key(x + i * GCOL, y + GCOL * 3, GW, GH, K_CH, r[i]);
            add_key(x + 7 * GCOL, y + GCOL * 3, (GW + GAP) * 3, GH, K_BACK, '<');
        }
        /* 第 5 行：ESC + SPACE(宽) + ENTER */
        {
            int total = 10 * GW + 9 * GAP;
            int x = (480 - total) / 2;
            add_key(x, y + GCOL * 4, GW, GH, K_ESC, 'X');
            add_key(x + GCOL, y + GCOL * 4, (GW + GAP) * 6, GH, K_SPACE, ' ');
            add_key(x + GCOL * 8, y + GCOL * 4, 2 * GW + GAP, GH, K_ENTER, '>');
        }
    } else { /* MEOW_IME_NUM */
        add_ch_row(y, "1234567890");
        add_ch_row(y + GCOL, "-/.:*#+=");
        {
            int total = 10 * GW + 9 * GAP;
            int x = (480 - total) / 2;
            add_key(x, y + GCOL * 2, GW, GH, K_ESC, 'X');
            add_key(x + GCOL, y + GCOL * 2, (GW + GAP) * 7, GH, K_SPACE, ' ');
            add_key(x + GCOL * 9, y + GCOL * 2, GW, GH, K_BACK, '<');
            add_key(x + GCOL * 9, y + GCOL * 2, GW, GH, K_ENTER, '>'); /* 覆盖：回车 */
        }
        /* 单独一行回车 */
        {
            int total = 10 * GW + 9 * GAP;
            int x = (480 - total) / 2;
            add_key(x + GCOL * 4, y + GCOL * 3, 2 * GW + GAP, GH, K_ENTER, '>');
        }
    }
}

/* ---- 编辑动作 ---- */
static int is_letter(char c) { return (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z'); }

static void apply_key(const struct kbkey *k)
{
    switch (k->kind) {
    case K_CH: {
        char c = g_shift && is_letter(k->ch) ? (char)toupper((unsigned char)k->ch) : k->ch;
        int len = (int)strlen(g_ime_buf);
        if (len < g_maxlen - 1) {
            g_ime_buf[len] = c; g_ime_buf[len + 1] = 0;
            if (g_ime_ctx.on_change) g_ime_ctx.on_change(g_ime_buf, g_ime_ctx.ctx);
        }
        break;
    }
    case K_SHIFT: g_shift = !g_shift; break;
    case K_SPACE: {
        int len = (int)strlen(g_ime_buf);
        if (len < g_maxlen - 1) { g_ime_buf[len] = ' '; g_ime_buf[len + 1] = 0;
            if (g_ime_ctx.on_change) g_ime_ctx.on_change(g_ime_buf, g_ime_ctx.ctx); }
        break;
    }
    case K_BACK: {
        int len = (int)strlen(g_ime_buf);
        if (len > 0) { g_ime_buf[len - 1] = 0;
            if (g_ime_ctx.on_change) g_ime_ctx.on_change(g_ime_buf, g_ime_ctx.ctx); }
        break;
    }
    case K_ENTER: g_ime_result = 1; g_ime_done = 1; break;
    case K_ESC:   g_ime_result = 0; g_ime_done = 1; break;
    }
}

/* ---- 绘制 ---- */
void meow_ime_draw(void)
{
    if (!g_ime_active) return;
    const meow_theme *th = meow_theme_get();
    /* 面板 */
    meow_ui_fill_rect(0, KB_TOP, 480, 720 - KB_TOP, 0x1C1C22);
    /* 预览行 */
    meow_ui_fill_rect(0, KB_TOP, 480, 42, 0x2A2A33);
    char preview[256];
    snprintf(preview, sizeof preview, "%s_", g_ime_buf);
    meow_ui_text(14, KB_TOP + 9, preview, th->font_body, 0xFFFFFF);
    /* 键 */
    for (int i = 0; i < g_nkeys; i++) {
        const struct kbkey *k = &g_keys[i];
        int is_fn = (k->kind != K_CH);
        uint32_t bg = is_fn ? 0x33333C : 0xFFFFFF;
        meow_gfx_fill_round(k->x, k->y, k->w, k->h, 8, bg);
        char label[2] = { k->ch, 0 };
        if (is_letter(k->ch)) label[0] = g_shift ? (char)toupper((unsigned char)k->ch)
                                                 : (char)tolower((unsigned char)k->ch);
        uint32_t fg = is_fn ? 0xFFFFFF : 0x1A1A1E;
        if (k->kind == K_SPACE) { meow_ui_text_center(k->x + k->w / 2, k->y + (k->h - meow_ui_text_height(20)) / 2, "SPACE", th->font_body, fg); }
        else if (k->kind == K_ENTER) { meow_ui_text_center(k->x + k->w / 2, k->y + (k->h - meow_ui_text_height(20)) / 2, "OK", 20, fg); }
        else { meow_ui_text_center(k->x + k->w / 2, k->y + (k->h - meow_ui_text_height(20)) / 2, label, 20, fg); }
    }
}

/* ---- 命中 ---- */
int meow_ime_handle_tap(int x, int y)
{
    if (!g_ime_active || g_ime_done) return 0;
    if (y < KB_TOP) { g_ime_result = 0; g_ime_done = 1; return 1; }  /* 背景点=取消 */
    for (int i = 0; i < g_nkeys; i++) {
        const struct kbkey *k = &g_keys[i];
        if (x >= k->x && x < k->x + k->w && y >= k->y && y < k->y + k->h) {
            apply_key(k);
            return 1;
        }
    }
    return 1;  /* 面板空隙：消费但不做 */
}

/* ---- 对外 ---- */
int  meow_ime_active(void) { return g_ime_active && !g_ime_done; }
const char *meow_ime_text(void) { return g_ime_buf; }

void meow_ime_close(int result)
{
    if (!g_ime_active) return;
    if (result && g_ime_orig) {
        strncpy(g_ime_orig->buf, g_ime_buf, sizeof g_ime_orig->buf - 1);
        g_ime_orig->buf[sizeof g_ime_orig->buf - 1] = 0;
    }
    g_ime_active = 0; g_ime_done = 0;
}

void meow_ui_text_input_async(meow_ime_ctx *ctx)
{
    if (!ctx) return;
    g_ime_orig = ctx;
    g_ime_ctx = *ctx;                 /* 拷贝（on_change 用） */
    strncpy(g_ime_buf, ctx->buf, sizeof g_ime_buf - 1);
    g_ime_buf[sizeof g_ime_buf - 1] = 0;
    g_maxlen = ctx->maxlen > 0 ? ctx->maxlen : 255;
    g_shift = 0; g_ime_result = 0; g_ime_done = 0; g_ime_active = 1;
    build_kb(ctx->mode);
    meow_input_start();
    meow_input_drain();
}

int meow_ui_text_input(meow_ime_ctx *ctx)
{
    if (!ctx) return 0;
    meow_ui_text_input_async(ctx);
    /* 阻塞循环：直到 done；on_change 由 handle_tap 触发 */
    while (meow_ime_active()) {
        meow_input_ev e;
        while (meow_input_pop(&e)) {
            if (e.type == MEOW_EV_TAP) meow_ime_handle_tap(e.a, e.b);
        }
        meow_ime_draw();
        meow_ui_flush();
        usleep(16000);
    }
    int result = g_ime_result;
    meow_ime_close(result);
    return result;
}