feat(files): 新增外置系统文件管理器 os.meow.files (agent-183) — 目录浏览(虚拟化列表/空态)+文本预览(≤256KB截断)+删除/重命名/新建/属性(BottomSheet+IME)；路径写操作限 TF 卡内(拒 .. 越界)；多文件结构(app.c+ui/{browser,viewer}.c+ui/common/chrome.c+logic/fsx.c) 按批次②范本
files md5 6f6b0a6d; 0 warning; 宿主 test_fsx 全过(路径安全/格式化/排序/虚拟化/写操作/文本嗅探); qemu 离屏冒烟通过 SDK 缺口记录: listview 仅单行 label(本 App 用 custom 画布自绘行); common 档字库中文缺字(未声明 fonts:full) 真机待验证: 列表渲染/滚动手感/IME 重命名/弹窗交互
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/* ui/viewer.c — 文本预览页（ACT_VIEWER，子页）view + 控制器。
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*
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* 只读、可滚动、≤256KB 截断（APP_READ_MAX，超长只读前 256KB）。
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* 行模型：把读入内容按 '\n' 切成逻辑行（<= VIEWER_MAX_LINES，超长截断并附加提示）；
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* 每逻辑行按可视列宽软换行成「屏幕行」；滚动按屏幕行像素仿真化（只画可见屏幕行）。
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* 打开时 meow_view_page_push(ACT_VIEWER)（on_enter 置标题/清滚动/整帧重画）；返回=左缘左滑/返回钮。
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*/
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#include "files_internal.h"
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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typedef struct { meow_view *view; int active; } viewer_ctrl;
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static viewer_ctrl g_vc;
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#define VIEWER_MAX_LINES 8192 /* 逻辑行上限（超长折行会很多，但按行数界内存） */
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static char *g_buf; /* malloc'd 读入内容（前 256KB，NUL 结尾） */
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static size_t g_buf_len;
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static char g_fname[FSX_MAX_NAME];
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static int *g_line; /* g_nline 个：每逻辑行起始偏移 */
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static int g_nline;
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static int *g_rown; /* g_nline 个：每逻辑行对应的首「屏幕行」下标 */
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static int g_nrows; /* 总屏幕行数（= 末行 rown + 其折行数） */
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static int g_vscroll; /* 滚动偏移（px） */
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static int g_vdrag, g_vdrag_last_y;
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static meow_widget *g_tb;
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static meow_widget *g_vcw; /* 内容区 custom widget（画文本行） */
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static app_rect_t r_content;
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/* 可视列宽（像素）。 */
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static int viewer_colw(void) { return r_content.w - 2 * APP_PAD; }
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/* 文本行区视口高（底部留页脚）。 */
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static int viewer_vp_h(void) { return r_content.h - APP_FOOTER_H; }
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/* 屏幕行高（px）。 */
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static int viewer_rowh(const meow_theme *th) { return meow_ui_text_height(th->font_body) + 6; }
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/* 折行：返回逻辑行 li 折成的屏幕行数；若 intra>=0，把该屏幕行文本写入 out（NUL 结尾）。 */
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static int viewer_wrap_line(int li, int intra, char *out, int outsz)
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{
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if (!g_buf || li < 0 || li >= g_nline) return 0;
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int start = g_line[li];
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int end = (li + 1 < g_nline) ? g_line[li + 1] : (int)g_buf_len;
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int len = end - start;
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while (len > 0 && (g_buf[start + len - 1] == '\n' || g_buf[start + len - 1] == '\r')) len--;
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int colw = viewer_colw();
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int col = 0, row = 0, outlen = 0;
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char ch[2]; ch[1] = '\0';
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for (int i = 0; i < len; i++) {
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ch[0] = g_buf[start + i];
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if (ch[0] == '\r') continue;
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int w = meow_ui_text_width(ch, 20);
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if (col + w > colw && col > 0) { row++; col = 0; }
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if (row == intra && out && outlen < outsz - 1) out[outlen++] = ch[0];
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col += w;
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}
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if (out) out[outlen] = '\0';
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return row + 1;
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}
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/* 读入文件并建行表；0=文本预览可读，-1=非文本/读失败。 */
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static int viewer_build(const char *path)
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{
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free(g_buf); free(g_line); free(g_rown);
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g_buf = NULL; g_line = NULL; g_rown = NULL;
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g_nline = 0; g_nrows = 0; g_buf_len = 0;
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g_fname[0] = '\0';
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int fd = open(path, O_RDONLY);
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if (fd < 0) return -1;
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size_t cap = APP_READ_MAX + 1;
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g_buf = (char *)malloc(cap);
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if (!g_buf) { close(fd); return -1; }
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ssize_t n = read(fd, g_buf, APP_READ_MAX);
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close(fd);
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if (n <= 0) { free(g_buf); g_buf = NULL; return -1; }
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g_buf_len = (size_t)n;
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g_buf[g_buf_len] = '\0';
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/* 非文本嗅探：前 512 字节出现 NUL 视为二进制 */
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int lim = (int)(g_buf_len < 512 ? g_buf_len : 512);
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for (int i = 0; i < lim; i++) if (g_buf[i] == '\0') { free(g_buf); g_buf = NULL; return -1; }
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/* 文件名 */
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const char *bn = fsx_basename(path);
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strncpy(g_fname, bn, FSX_MAX_NAME - 1);
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g_fname[FSX_MAX_NAME - 1] = '\0';
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/* 切逻辑行（上限 VIEWER_MAX_LINES；超出截断，末行吸收剩余 + 附截断提示） */
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int cap_l = VIEWER_MAX_LINES;
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g_line = (int *)malloc((size_t)cap_l * sizeof(int));
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g_rown = (int *)malloc((size_t)cap_l * sizeof(int));
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if (!g_line || !g_rown) { free(g_buf); free(g_line); free(g_rown); g_buf = NULL; g_line=NULL; g_rown=NULL; return -1; }
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g_nline = 0;
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g_line[g_nline++] = 0;
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int truncated = 0;
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for (size_t i = 0; i < g_buf_len; i++) {
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if (g_buf[i] == '\n') {
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if (g_nline < cap_l) g_line[g_nline++] = (int)i + 1;
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else { truncated = 1; break; }
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}
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}
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if (truncated) {
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g_line[g_nline - 1] = (int)g_buf_len; /* 让最后一行吸收剩余 */
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}
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/* 折行累加 → 屏幕行下标 */
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g_nrows = 0;
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for (int li = 0; li < g_nline; li++) {
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g_rown[li] = g_nrows;
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g_nrows += viewer_wrap_line(li, -1, NULL, 0);
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}
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return 0;
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}
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/* 宿主测试/入口兼容：读入 buffer 并解析行。 */
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void viewer_load(const char *path) { viewer_build(path); }
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/* 内容区 render_cb：虚拟化画可见屏幕行。 */
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static void viewer_render(meow_widget *w, const meow_theme *th, void *ctx)
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{
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(void)w; (void)ctx;
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if (!g_buf || g_nrows <= 0) {
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app_draw_empty(r_content, "NOT A TEXT FILE", g_fname[0] ? g_fname : "");
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return;
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}
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int rowh = viewer_rowh(th);
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if (rowh < 1) rowh = 1;
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int vp = viewer_vp_h();
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int top = g_vscroll / rowh;
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int bot = (g_vscroll + vp) / rowh + 1;
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if (top < 0) top = 0;
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if (bot > g_nrows) bot = g_nrows;
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char row[512];
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for (int sr = top; sr < bot; sr++) {
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/* 二分找逻辑行 li：g_rown[li] <= sr 的最大 li */
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int lo = 0, hi = g_nline - 1, li = 0;
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while (lo <= hi) {
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int mid = (lo + hi) / 2;
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if (g_rown[mid] <= sr) { li = mid; lo = mid + 1; }
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else { hi = mid - 1; }
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}
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int intra = sr - g_rown[li];
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row[0] = '\0';
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viewer_wrap_line(li, intra, row, (int)sizeof row);
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if (!row[0] && intra == 0) row[0] = ' ', row[1] = '\0';
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int ry = r_content.y + (sr * rowh - g_vscroll);
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if (ry < r_content.y) continue;
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if (ry >= r_content.y + vp) break;
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meow_ui_text(r_content.x + APP_PAD, ry, row, th->font_body, th->onSurface);
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}
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/* 页脚：行数 + 文件名（含截断提示） */
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char foot[128];
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if (g_buf_len >= APP_READ_MAX)
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snprintf(foot, sizeof foot, ">256KB (truncated) %d row(s)", g_nrows);
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else
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snprintf(foot, sizeof foot, "%d row(s)", g_nrows);
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app_draw_footer(r_content, foot);
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}
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static int viewer_hit(meow_widget *w, int x, int y, void *ctx)
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{
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(void)w; (void)ctx;
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return x >= r_content.x && x < r_content.x + r_content.w &&
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y >= r_content.y && y < r_content.y + r_content.h;
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}
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static void viewer_clamp_scroll(void)
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{
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const meow_theme *th = meow_theme_get();
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int rowh = viewer_rowh(th);
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int content_h = g_nrows * rowh;
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int maxs = content_h - viewer_vp_h();
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if (maxs < 0) maxs = 0;
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if (g_vscroll < 0) g_vscroll = 0;
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if (g_vscroll > maxs) g_vscroll = maxs;
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}
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int viewer_open_file(const char *path)
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{
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if (viewer_build(path) != 0) return -1;
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meow_view_page_push(ACT_VIEWER);
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return 0;
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}
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int viewer_is_active(void) { return g_vc.active; }
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void viewer_swipe(int dir, int dist)
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{
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if (dir != MEOW_SWIPE_UP && dir != MEOW_SWIPE_DOWN) return;
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int del = (dir == MEOW_SWIPE_UP) ? dist : -dist;
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g_vscroll += del;
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viewer_clamp_scroll();
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meow_ui_invalidate(r_content.x, r_content.y, r_content.w, r_content.h);
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}
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void viewer_touch_down(int x, int y)
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{
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(void)x;
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g_vdrag = 0; g_vdrag_last_y = 0;
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if (!g_buf) return;
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if (meow_widget_hit(g_vcw, x, y)) { g_vdrag = 1; g_vdrag_last_y = y; }
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}
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void viewer_touch_move(int x, int y)
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{
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(void)x;
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if (!g_vdrag) return;
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int dy = y - g_vdrag_last_y;
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g_vdrag_last_y = y;
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if (dy == 0) return;
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g_vscroll -= dy;
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viewer_clamp_scroll();
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meow_ui_invalidate(r_content.x, r_content.y, r_content.w, r_content.h);
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}
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int viewer_on_tap(int x, int y)
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{
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if (g_tb) {
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int ah = meow_topappbar_hit(g_tb, x, y);
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if (ah == MEOW_TOPBAR_BACK) { meow_view_page_pop(); return 1; }
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}
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return 0;
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}
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/* ---- 页 view 生命周期 ---- */
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static void viewer_page_create(meow_view *v, void *ctx)
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{
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(void)v;
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((viewer_ctrl *)ctx)->view = v;
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r_content = app_content_rect();
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meow_ui_activity_push(ACT_VIEWER); /* 让下面控件 owner=ACT_VIEWER */
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g_tb = app_topbar_create("Preview", 1, NULL);
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g_vcw = meow_widget_custom_create(r_content.x, r_content.y, r_content.w, r_content.h,
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viewer_render, viewer_hit, NULL);
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meow_ui_activity_pop();
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}
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static void viewer_page_enter(meow_view *v, void *ctx)
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{
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(void)v;
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((viewer_ctrl *)ctx)->active = 1;
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g_vscroll = 0;
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if (g_tb) meow_topappbar_set_title(g_tb, g_fname[0] ? g_fname : "Preview");
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const meow_theme *th = meow_theme_get();
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meow_ui_set_page_bg(th->bg);
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meow_ui_paint_full();
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}
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static void viewer_page_leave(meow_view *v, void *ctx)
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{
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(void)v;
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((viewer_ctrl *)ctx)->active = 0;
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}
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static void viewer_page_destroy(meow_view *v, void *ctx)
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{
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(void)v; (void)ctx;
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if (g_vcw) { meow_widget_free(g_vcw); g_vcw = NULL; }
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if (g_tb) { meow_widget_free(g_tb); g_tb = NULL; }
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free(g_buf); free(g_line); free(g_rown);
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g_buf = NULL; g_line = NULL; g_rown = NULL;
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}
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meow_view *viewer_view_create(void)
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{
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static const meow_view_hooks h = {
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.on_create = viewer_page_create,
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.on_enter = viewer_page_enter,
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.on_leave = viewer_page_leave,
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.on_destroy = viewer_page_destroy,
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};
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return meow_view_create(ACT_VIEWER, MEOW_VIEW_ACTIVITY, &h, &g_vc);
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}
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