MeowOS-For-R3P2/patch_v2/hello_app/ui/demo.c

/* ui/demo.c — 控件库 Demo 演示页（ACT_DEMO）view + 控制器。
 *
 * 内容控件以绝对坐标创建，页滚动 = 按「base_y - scroll」重建内容（owner=ACT_DEMO 不变）；
 * 各控件跨重建状态存 g_ds（App 持有），重建后恢复。绘制走 batch① 郑序注册表：demo_paint 调
 * meow_ui_set_page_bg + meow_ui_paint_full（整帧按 z 重画：内容→标题/slider值→chrome 置顶），
 * 局部刷新统一 meow_ui_invalidate（清底+按 z 重画相交绘制物）。旧 d_paint_region/d_redraw/
 * d_rect_overlap（App 层郑栈重画）已删、下沉 SDK。
 *
 * 设计定案 B（SDK_VIEW_FRAMEWORK_DESIGN §B.3/F）：demo 的 g_ds/g_drag_* /g_demo_scroll 等视图态
 * 留本文件（不迁 logic）；UI→业务只经 logic_* / notify_*。页面进入/离开经 meow_view_page_push/pop
 * 驱动 on_enter/on_leave（demo_page_enter/leave）。
 */
#include "hello_internal.h"
#include <stdio.h>
#include <string.h>
#include <stdint.h>

/* 供 demo_content_tap / touch 回调用的前向声明 */
static void demo_slider_drag(int x);

static demo_ctrl g_demo_ctrl;

/* ---- demo 演示页状态 ---- */
int g_demo = 0;             /* 1=处于 demo 演示页 */
int g_demo_scroll = 0;      /* 内容区滚动偏移（base 空间 px） */
int g_demo_focus = 0;       /* 1=LazyColumn 聚焦（swipe 滚列表而非页面） */
static int g_demo_fab = 0;  /* FAB 点击计数反馈 */
static int g_demo_prog = 0; /* ProgressBar 动画当前值 0..100 */
static uint64_t g_demo_prog_last = 0;
static int g_demo_ct = 0;       /* 内容视口顶（屏y = statusbar+56+8） */
static int g_demo_cb = 0;       /* 内容视口底（屏y =608，NavBar 上方留白） */
static int g_demo_content_h = 0;/* 内容总高（base 空间；决定 max_scroll） */

/* M2.71-bug2/6：拖动过程（跟手）状态。on_touch_down 锁一种拖拽，on_touch_move 实时更新。 */
static int g_drag_slider = 0;      /* 手指按在 slider */
int g_drag_list = 0;               /* 手指按在 LazyColumn：拖拽滚列表 */
int g_drag_page = 0;               /* 手指按在页内容（非 slider/list）：拖拽滚页面 */
static int g_drag_list_last_y = 0; /* 列表拖拽上一帧 y */
static int g_drag_page_last_y = 0; /* 页面拖拽上一帧 y */
static int g_drag_page_delta = 0;  /* 页面拖拽累计位移（节流重建，≥8px 才重建一次） */

/* SDK 控件不透明：App 自记几何，用于局部 flush / 命中 / scroll 重建。 */

/* demo 各控件跨重建保留的状态（app 持有；重建后按此恢复） */
static struct {
    int sw_on; int slider; char tf[32];
    int ck; int r1, r2; int btn[5]; int card; int tab; int list; int list_sel; int prog;
} g_ds = { .sw_on = 1, .slider = 40, .r1 = 1, .tab = 1, .list = 0, .list_sel = 0, .prog = 0 };

/* demo 内容布局常量（base 空间） */
#define DCL_X 16
#define DCR_X 252
#define DCW   212
#define DFW   448
#define DBH   44
#define DCH   52   /* 一行两列按钮步进 */

/* demo 内容槽：控件 + 其当前屏幕几何（rebuild 时重算） */
#define D_SLOT_MAX 64
static struct { meow_widget *w; rect_t r; } g_dslot[D_SLOT_MAX];
static int g_dslot_n = 0;

/* demo 分区小标题（纯文本，非控件；屏幕坐标在 rebuild 时算好） */
#define D_TITLE_MAX 16
static struct { int x, y; const char *s; } g_dtitle[D_TITLE_MAX];
static int g_dtitle_n = 0;

/* demo 交互组件引用（rebuild 时 g_* 与 r_* 同步重指/recompute；chrome 在 ui/common/chrome.c） */
static meow_widget *g_dbtn_b[5]; static rect_t r_btn[5];  /* Button 五型 */
static meow_widget *g_dbtn_d;                    /* DISABLED 按钮（禁用不命中，无需 rect） */
static meow_widget *g_dsw;  static rect_t r_dsw;    /* Switch */
static meow_widget *g_dslider; static rect_t r_slider, r_slider_txt; /* Slider + 值文本 */
static meow_widget *g_dtf;  static rect_t r_dtf;    /* TextField */
static meow_widget *g_dcb;  static rect_t r_dcb;    /* Checkbox */
static meow_widget *g_dr1, *g_dr2; rect_t r_dr1, r_dr2; /* Radio 单选组 */
static meow_widget *g_dprl; static rect_t r_prl;    /* ProgressBar 线性 */
meow_widget *g_dprc; rect_t r_prc;                  /* ProgressBar 圆形 */
static meow_widget *g_dcard; static rect_t r_card;  /* Card */
static meow_widget *g_dcard_btn; static rect_t r_cardbtn; /* Card 内容子按钮 */
static meow_widget *g_dbadge;                       /* Badge */
static meow_widget *g_dtab;  static rect_t r_tab;   /* TabBar */
static meow_widget *g_dbtn_dlg; static rect_t r_dlg;    /* 打开 Dialog 的按钮 */
static meow_widget *g_dbtn_sheet; static rect_t r_sheet;/* 打开 BottomSheet 的按钮 */
meow_widget *g_dlc; rect_t r_list;                  /* LazyColumn */

/* ---- demo 分区标题/slider 值文本：注册为 CUSTOM 绘制物（§6.2 区域重画会重画它们）----
 * 显式 z=D_TITLE_Z：> 一切自动 z(=127)、< chrome 置顶(999)。非控件直绘必须注册，否则
 * meow_ui_invalidate 清底后会漏画。 */
#define D_TITLE_Z 128
static int g_dtitle_cid[D_TITLE_MAX];   /* 分区标题绘制物 id（rebuild 时注销/重注册） */
static int g_slider_cid = 0;            /* slider 值文本绘制物 id */

/* CUSTOM 绘制回调：分区标题（ctx=title 下标，指向 g_dtitle[i]） */
static void demo_draw_title(void *ctx)
{
    int i = (int)(intptr_t)ctx;
    if (i < 0 || i >= g_dtitle_n) return;
    const meow_theme *th = meow_theme_get();
    meow_ui_text(g_dtitle[i].x, g_dtitle[i].y, g_dtitle[i].s, 20, th->primary);
}
/* CUSTOM 绘制回调：slider 当前值文本（bbox=r_slider_txt） */
static void demo_draw_slider_val(void *ctx)
{
    (void)ctx;
    if (!g_dslider) return;
    const meow_theme *th = meow_theme_get();
    char buf[28]; snprintf(buf, sizeof buf, "slider = %d", meow_slider_get(g_dslider));
    meow_ui_text(r_slider_txt.x, r_slider_txt.y, buf, 20, th->dim);
}

/* ---- demo 构建/布局 ---- */

static void d_slot(meow_widget *w, rect_t r)
{
    if (g_dslot_n < D_SLOT_MAX) { g_dslot[g_dslot_n].w = w; g_dslot[g_dslot_n].r = r; g_dslot_n++; }
}
static void d_title(int x, int y, const char *s)
{
    if (g_dtitle_n < D_TITLE_MAX) {
        int i = g_dtitle_n;
        g_dtitle[i].x = x; g_dtitle[i].y = y; g_dtitle[i].s = s;
        g_dtitle_n++;
        int tw = meow_ui_text_width(s, 20);
        int th = meow_ui_text_height(20);
        g_dtitle_cid[i] = meow_draw_custom_register(D_TITLE_Z, x, y, tw, th,
                                                    demo_draw_title, (void *)(intptr_t)i);
    }
}

/* LazyColumn 数据源（100 项虚拟化） */
static int demo_list_src(int idx, char *label, int len, void *ctx)
{
    (void)ctx;
    if (idx < 0 || idx >= 100) return 0;
    snprintf(label, (size_t)len, "list item %d", idx);
    return 1;
}

/* 释放当前全部内容控件（含 Card 的独立子按钮）与 CUSTOM 绘制物；chrome 不在其列。 */
static void demo_free_content(void)
{
    for (int i = 0; i < g_dslot_n; i++) meow_widget_free(g_dslot[i].w);
    g_dslot_n = 0;
    if (g_dcard_btn) { meow_widget_free(g_dcard_btn); g_dcard_btn = NULL; }
    for (int i = 0; i < g_dtitle_n; i++)
        if (g_dtitle_cid[i] > 0) { meow_draw_unregister(g_dtitle_cid[i]); g_dtitle_cid[i] = 0; }
    if (g_slider_cid > 0) { meow_draw_unregister(g_slider_cid); g_slider_cid = 0; }
    g_dtitle_n = 0;
}

/* 按 scroll 重建全部内容控件（owner=ACT_DEMO：调用方须已 push ACT_DEMO）。
 * 控件以绝对坐标创建于 (x, base_y - scroll)，几何同步写入 r_* / 槽；状态从 g_ds 恢复。 */
static void demo_build_at(int scroll)
{
    int ct = meow_ui_statusbar_height() + 56 + 8;
    g_demo_ct = ct; g_demo_cb = 608;
    g_dslot_n = 0; g_dtitle_n = 0;
    int yb = 0;
#define SY(base) (ct + (base) - scroll)          /* base 空间 → 屏幕 y */
#define SLOT(w,x,y,ww,hh) do { rect_t _r=RX(x,y,ww,hh); d_slot((w),_r); } while(0)

    /* ---- Buttons（五型 + 禁用） ---- */
    d_title(DCL_X, SY(yb), "BUTTONS 5-variants"); yb += 26;
    r_btn[0] = RX(DCL_X, SY(yb), DCW, DBH); g_dbtn_b[0] = meow_btn_create_variant(r_btn[0].x, r_btn[0].y, DCW, DBH, "FILLED", MEOW_BTN_FILLED); SLOT(g_dbtn_b[0], r_btn[0].x, r_btn[0].y, r_btn[0].w, r_btn[0].h);
    r_btn[1] = RX(DCR_X, SY(yb), DCW, DBH); g_dbtn_b[1] = meow_btn_create_variant(r_btn[1].x, r_btn[1].y, DCW, DBH, "TONAL", MEOW_BTN_TONAL); SLOT(g_dbtn_b[1], r_btn[1].x, r_btn[1].y, r_btn[1].w, r_btn[1].h);
    yb += DCH;
    r_btn[2] = RX(DCL_X, SY(yb), DCW, DBH); g_dbtn_b[2] = meow_btn_create_variant(r_btn[2].x, r_btn[2].y, DCW, DBH, "OUTLINED", MEOW_BTN_OUTLINED); SLOT(g_dbtn_b[2], r_btn[2].x, r_btn[2].y, r_btn[2].w, r_btn[2].h);
    r_btn[3] = RX(DCR_X, SY(yb), DCW, DBH); g_dbtn_b[3] = meow_btn_create_variant(r_btn[3].x, r_btn[3].y, DCW, DBH, "TEXT", MEOW_BTN_TEXT); SLOT(g_dbtn_b[3], r_btn[3].x, r_btn[3].y, r_btn[3].w, r_btn[3].h);
    yb += DCH;
    r_btn[4] = RX(DCL_X, SY(yb), DCW, DBH); g_dbtn_b[4] = meow_btn_create_variant(r_btn[4].x, r_btn[4].y, DCW, DBH, "ELEVATED", MEOW_BTN_ELEVATED); SLOT(g_dbtn_b[4], r_btn[4].x, r_btn[4].y, r_btn[4].w, r_btn[4].h);
    g_dbtn_d = meow_btn_create_variant(DCR_X, SY(yb), DCW, DBH, "DISABLED", MEOW_BTN_FILLED);
    SLOT(g_dbtn_d, DCR_X, SY(yb), DCW, DBH);
    meow_widget_set_enabled(g_dbtn_d, 0);          /* 禁用态：不命中 + 变暗 */
    yb += DCH;
    for (int i = 0; i < 5; i++) meow_widget_set_selected(g_dbtn_b[i], g_ds.btn[i]);

    SLOT(meow_divider_create(DCL_X, SY(yb), DFW, 0), DCL_X, SY(yb), DFW, 1); yb += 16;

    /* ---- Input / State（Switch / Slider / TextField / Checkbox / Radio） ---- */
    d_title(DCL_X, SY(yb), "INPUT & STATE"); yb += 26;
    r_dsw = RX(DCL_X, SY(yb), 56, 32); g_dsw = meow_switch_create(r_dsw.x, r_dsw.y, g_ds.sw_on); SLOT(g_dsw, r_dsw.x, r_dsw.y, r_dsw.w, r_dsw.h); yb += 44;

    r_slider_txt = RX(DCL_X, SY(yb), 160, 24); yb += 24;   /* 加宽到覆盖值文本全宽（防局部刷漏尾） */
    r_slider = RX(DCL_X, SY(yb), DFW, 40); g_dslider = meow_slider_create(r_slider.x, r_slider.y, r_slider.w, 0, 100, g_ds.slider); SLOT(g_dslider, r_slider.x, r_slider.y, r_slider.w, r_slider.h); yb += 48;
    g_slider_cid = meow_draw_custom_register(D_TITLE_Z, r_slider_txt.x, r_slider_txt.y,
                                             r_slider_txt.w, r_slider_txt.h,
                                             demo_draw_slider_val, NULL);

    r_dtf = RX(DCL_X, SY(yb), DFW, 44); g_dtf = meow_textfield_create(r_dtf.x, r_dtf.y, r_dtf.w, r_dtf.h, "Type here...", g_ds.tf, 32, MEOW_IME_ASCII); SLOT(g_dtf, r_dtf.x, r_dtf.y, r_dtf.w, r_dtf.h); yb += 54;

    r_dcb = RX(DCL_X, SY(yb), 34, 34); g_dcb = meow_checkbox_create(r_dcb.x, r_dcb.y); SLOT(g_dcb, r_dcb.x, r_dcb.y, r_dcb.w, r_dcb.h);
    r_dr1 = RX(DCR_X, SY(yb), 34, 34); g_dr1 = meow_radio_create(r_dr1.x, r_dr1.y); SLOT(g_dr1, r_dr1.x, r_dr1.y, r_dr1.w, r_dr1.h);
    yb += 40;
    r_dr2 = RX(DCR_X, SY(yb), 34, 34); g_dr2 = meow_radio_create(r_dr2.x, r_dr2.y); SLOT(g_dr2, r_dr2.x, r_dr2.y, r_dr2.w, r_dr2.h);
    yb += 40;
    meow_widget_set_selected(g_dcb, g_ds.ck);
    meow_widget_set_selected(g_dr1, g_ds.r1);
    meow_widget_set_selected(g_dr2, g_ds.r2);

    /* ---- ProgressBar（线性 + 圆形，on_tick 动画） ---- */
    d_title(DCL_X, SY(yb), "PROGRESS (animated)"); yb += 26;
    r_prl = RX(DCL_X, SY(yb), DFW, 8); g_dprl = meow_progress_create(r_prl.x, r_prl.y, r_prl.w, r_prl.h, g_ds.prog); SLOT(g_dprl, r_prl.x, r_prl.y, r_prl.w, r_prl.h); yb += 16;
    r_prc = RX(DCL_X + 400 + 17 - 20, SY(yb) + 17 - 20, 40, 40);
    g_dprc = meow_progress_circular_create(r_prc.x + 20, r_prc.y + 20, 17, g_ds.prog);
    SLOT(g_dprc, r_prc.x, r_prc.y, r_prc.w, r_prc.h); yb += 48;

    /* ---- Container（Card / Badge / TabBar） ---- */
    d_title(DCL_X, SY(yb), "CONTAINER"); yb += 26;
    r_card = RX(DCL_X, SY(yb), DFW, 88); g_dcard = meow_card_create(r_card.x, r_card.y, r_card.w, r_card.h); SLOT(g_dcard, r_card.x, r_card.y, r_card.w, r_card.h);
    r_cardbtn = RX(DCL_X + 16, SY(yb) + 20, DFW - 32, 40); g_dcard_btn = meow_btn_create_variant(r_cardbtn.x, r_cardbtn.y, r_cardbtn.w, r_cardbtn.h, "IN-CARD BUTTON", MEOW_BTN_TONAL);
    meow_widget_set_selected(g_dcard_btn, g_ds.card);
    meow_card_set_content(g_dcard, g_dcard_btn);
    yb += 96;
    g_dbadge = meow_badge_create(DCL_X + 60, SY(yb) + 10);
    SLOT(g_dbadge, DCL_X + 52, SY(yb) + 2, 18, 18);
    meow_badge_set(g_dbadge, 3);
    yb += 30;
    r_tab = RX(DCL_X, SY(yb), DFW, 36); g_dtab = meow_tabbar_create(r_tab.x, r_tab.y, r_tab.w, r_tab.h); SLOT(g_dtab, r_tab.x, r_tab.y, r_tab.w, r_tab.h);
    meow_tabbar_add_tab(g_dtab, "Playlist");
    meow_tabbar_add_tab(g_dtab, "Queue");
    meow_tabbar_add_tab(g_dtab, "Now");
    meow_tabbar_set_selected(g_dtab, g_ds.tab);
    yb += 44;

    /* ---- Modals（Dialog + BottomSheet） ---- */
    d_title(DCL_X, SY(yb), "MODALS (blocking)"); yb += 26;
    r_dlg = RX(DCL_X, SY(yb), DCW, DBH); g_dbtn_dlg = meow_btn_create_variant(r_dlg.x, r_dlg.y, r_dlg.w, r_dlg.h, "DIALOG", MEOW_BTN_OUTLINED); SLOT(g_dbtn_dlg, r_dlg.x, r_dlg.y, r_dlg.w, r_dlg.h);
    r_sheet = RX(DCR_X, SY(yb), DCW, DBH); g_dbtn_sheet = meow_btn_create_variant(r_sheet.x, r_sheet.y, r_sheet.w, r_sheet.h, "SHEET", MEOW_BTN_OUTLINED); SLOT(g_dbtn_sheet, r_sheet.x, r_sheet.y, r_sheet.w, r_sheet.h);
    yb += DCH;

    /* ---- LazyColumn（100 项列表滚动） ---- */
    d_title(DCL_X, SY(yb), "LIST (LazyColumn, tap+swipe)"); yb += 26;
    r_list = RX(DCL_X, SY(yb), DFW, 150); g_dlc = meow_lazycolumn_create(r_list.x, r_list.y, r_list.w, r_list.h, 40, 100, demo_list_src, NULL);
    SLOT(g_dlc, r_list.x, r_list.y, r_list.w, r_list.h);
    meow_list_set_scroll(g_dlc, g_ds.list);
    meow_list_set_selected(g_dlc, g_ds.list_sel);   /* M2.71-bug8：跨重建保留选中行 */
    yb += 158;

    g_demo_content_h = yb;
#undef SY
#undef SLOT
}

/* demo 全页重绘：整帧按 z 序重画全部（set_page_bg 清底 + 注册表按 z 升序）。 */
void demo_paint(void)
{
    const meow_theme *th = meow_theme_get();
    meow_ui_set_page_bg(th->bg);   /* 页面底 = 主题 bg（区域/整帧重画清底用） */
    meow_ui_paint_full();          /* 整帧按 z 序重画 */
}

/* 重建内容到指定 scroll（clamp 到 [0, max_scroll]）；进入/滚动共用 */
void demo_rebuild_to(int scroll)
{
    int vp_h = g_demo_cb - g_demo_ct;
    int maxs = g_demo_content_h - vp_h;
    if (maxs < 0) maxs = 0;
    if (scroll < 0) scroll = 0;
    if (scroll > maxs) scroll = maxs;
    demo_free_content();
    demo_build_at(scroll);
    g_demo_scroll = scroll;
    demo_paint();
}

/* ---- demo 交互 ---- */

/* 局部刷新统一走 SDK meow_ui_invalidate（清底 + 按 z 重画相交绘制物 + 上屏）。 */
static void d_toggle_sel(meow_widget *w, rect_t r)
{
    if (!w) return;
    meow_widget_set_selected(w, !meow_widget_selected(w));
    meow_ui_invalidate(r.x, r.y, r.w, r.h);
}

/* Tap：落点在内容控件上，返回 1=已消费 */
static int demo_content_tap(int x, int y)
{
    g_demo_focus = 0;   /* 默认切回页滚动；仅命中列表时改置 1 */

    for (int i = 0; i < 5; i++)
        if (meow_widget_hit(g_dbtn_b[i], x, y)) { d_toggle_sel(g_dbtn_b[i], r_btn[i]); g_ds.btn[i] = meow_widget_selected(g_dbtn_b[i]); return 1; }
    if (meow_widget_hit(g_dr1, x, y)) { meow_widget_set_selected(g_dr1, 1); meow_widget_set_selected(g_dr2, 0); g_ds.r1 = 1; g_ds.r2 = 0; meow_ui_invalidate(r_dr1.x, r_dr1.y, r_dr1.w, r_dr1.h); meow_ui_invalidate(r_dr2.x, r_dr2.y, r_dr2.w, r_dr2.h); return 1; }
    if (meow_widget_hit(g_dr2, x, y)) { meow_widget_set_selected(g_dr2, 1); meow_widget_set_selected(g_dr1, 0); g_ds.r2 = 1; g_ds.r1 = 0; meow_ui_invalidate(r_dr1.x, r_dr1.y, r_dr1.w, r_dr1.h); meow_ui_invalidate(r_dr2.x, r_dr2.y, r_dr2.w, r_dr2.h); return 1; }
    if (meow_widget_hit(g_dcb, x, y)) { d_toggle_sel(g_dcb, r_dcb); g_ds.ck = meow_widget_selected(g_dcb); return 1; }
    if (meow_widget_hit(g_dsw, x, y)) { g_ds.sw_on = !meow_switch_get(g_dsw); meow_switch_set(g_dsw, g_ds.sw_on); meow_ui_invalidate(r_dsw.x, r_dsw.y, r_dsw.w, r_dsw.h); return 1; }
    if (meow_widget_hit(g_dslider, x, y)) { demo_slider_drag(x); return 1; }
    if (meow_widget_hit(g_dtf, x, y)) {
        meow_textfield_activate(g_dtf);   /* 阻塞 IME，返回后刷新 + 状态回写 */
        strncpy(g_ds.tf, meow_textfield_text(g_dtf), sizeof g_ds.tf - 1);
        g_ds.tf[sizeof g_ds.tf - 1] = 0;
        meow_ui_invalidate(r_dtf.x, r_dtf.y, r_dtf.w, r_dtf.h);
        return 1;
    }
    if (meow_widget_hit(g_dcard_btn, x, y)) { d_toggle_sel(g_dcard_btn, r_cardbtn); g_ds.card = meow_widget_selected(g_dcard_btn); return 1; }
    if (g_dtab) {
        int t = meow_tabbar_hit(g_dtab, x, y);
        if (t >= 0) { g_ds.tab = t; meow_tabbar_set_selected(g_dtab, t); meow_ui_invalidate(r_tab.x, r_tab.y, r_tab.w, r_tab.h); return 1; }
    }
    if (meow_widget_hit(g_dbtn_dlg, x, y)) { meow_dialog_show(g_dlg); meow_log(MEOW_LOG_INFO, "dialog result=%d", meow_dialog_result(g_dlg)); meow_ui_invalidate(r_dlg.x, r_dlg.y, r_dlg.w, r_dlg.h); return 1; }
    if (meow_widget_hit(g_dbtn_sheet, x, y)) { int r = meow_sheet_open(g_sheet); meow_log(MEOW_LOG_INFO, "sheet result=%d", r); meow_ui_invalidate(r_sheet.x, r_sheet.y, r_sheet.w, r_sheet.h); return 1; }
    if (meow_widget_hit(g_dlc, x, y)) {
        g_demo_focus = 1;
        int li = meow_list_tap_at(g_dlc, x, y);   /* M2.71-bug8：命中行→置选中并高亮 */
        if (li >= 0) { g_ds.list_sel = li; meow_ui_invalidate(r_list.x, r_list.y, r_list.w, r_list.h); }
        return 1;
    }
    return 0;
}

/* demo 页 on_tap 分发（chrome → 内容） */
void demo_on_tap(int x, int y)
{
    if (g_tb) {
        int ah = meow_topappbar_hit(g_tb, x, y);
        if (ah == MEOW_TOPBAR_BACK) { meow_view_page_pop(); return; }
    }
    if (g_fab && meow_widget_hit(g_fab, x, y)) {
        g_demo_fab++;
        char lb[16]; snprintf(lb, sizeof lb, "+%d", g_demo_fab);
        meow_widget_free(g_fab);
        g_fab = meow_fab_create(r_fab.x, r_fab.y, 56, lb);
        meow_widget_set_z(g_fab, 999);   /* 重建后重挂顶：新 entry 自动 z 低，须显式置顶 */
        meow_ui_invalidate(r_fab.x, r_fab.y, r_fab.w, r_fab.h);   /* 重画 FAB 及其下重叠 z 栈 */
        return;
    }
    if (g_nav) {
        int idx = meow_navigationbar_hit(g_nav, x, y);
        if (idx >= 0) { meow_navigationbar_set_selected(g_nav, idx); meow_ui_invalidate(r_nav.x, r_nav.y, r_nav.w, r_nav.h); return; }
    }
    demo_content_tap(x, y);
}

/* demo 页 on_tick：ProgressBar 动画（局部刷，~120ms 步进） */
void demo_tick(uint64_t now)
{
    if (g_demo_prog_last == 0) g_demo_prog_last = now;
    if (now - g_demo_prog_last < 120) return;
    g_demo_prog_last = now;
    g_ds.prog = (g_ds.prog + 3) % 101;
    g_demo_prog = g_ds.prog;
    meow_progress_set(g_dprl, g_demo_prog); meow_ui_invalidate(r_prl.x, r_prl.y, r_prl.w, r_prl.h);
    meow_progress_set(g_dprc, g_demo_prog); meow_ui_invalidate(r_prc.x, r_prc.y, r_prc.w, r_prc.h);
}

/* 按触碰 X 落 slider 值并局部刷（按下即定位 + 拖动实时，M2.71-bug2） */
static void demo_slider_drag(int x)
{
    int frac = x - r_slider.x; if (frac < 0) frac = 0; if (frac > r_slider.w) frac = r_slider.w;
    g_ds.slider = frac * 100 / r_slider.w;
    meow_slider_set(g_dslider, g_ds.slider);
    meow_ui_invalidate(r_slider.x, r_slider.y, r_slider.w, r_slider.h);
    meow_ui_invalidate(r_slider_txt.x, r_slider_txt.y, r_slider_txt.w, r_slider_txt.h);  /* 重画值文本 */
}

/* demo 页 on_touch_down：锁一种拖拽（slider > list > 页内容）。 */
void demo_touch_down(int x, int y)
{
    g_drag_slider = 0; g_drag_list = 0; g_drag_page = 0; g_drag_page_delta = 0;
    if (!g_demo) return;
    if (meow_widget_hit(g_dslider, x, y)) { g_drag_slider = 1; demo_slider_drag(x); return; }
    if (g_dlc && meow_widget_hit(g_dlc, x, y)) {
        g_demo_focus = 1; g_drag_list = 1; g_drag_list_last_y = y; return;
    }
    g_demo_focus = 0;
    if (y >= g_demo_ct && y < g_demo_cb && x >= 0 && x < meow_ui_width()) {
        g_drag_page = 1; g_drag_page_last_y = y;
    }
}

/* demo 页 on_touch_move：拖动过程实时更新（slider 值 / 列表滚动 / 页面滚动节流重建）。 */
void demo_touch_move(int x, int y)
{
    if (!g_demo) return;
    if (g_drag_slider) { demo_slider_drag(x); return; }
    if (g_drag_list) {
        int dy = y - g_drag_list_last_y; g_drag_list_last_y = y;
        if (dy) { meow_list_scroll_by(g_dlc, -dy); g_ds.list = meow_list_scroll(g_dlc); meow_ui_invalidate(r_list.x, r_list.y, r_list.w, r_list.h); }
        return;
    }
    if (g_drag_page) {
        int dy = y - g_drag_page_last_y; g_drag_page_last_y = y;
        g_drag_page_delta += -dy;   /* 手指上移(y 减) → scroll 增（显示更低内容），与 on_swipe 一致 */
        if (g_drag_page_delta >= 8 || g_drag_page_delta <= -8) {
            demo_rebuild_to(g_demo_scroll + g_drag_page_delta);
            g_drag_page_delta = 0;
        }
    }
}

/* demo 页 on_swipe：LEFT=回 home；UP/DOWN=列表聚焦滚列表，否则页滚动。 */
void demo_swipe(int dir, int dist)
{
    if (dir == MEOW_SWIPE_LEFT) { meow_view_page_pop(); return; }
    if (dir != MEOW_SWIPE_UP && dir != MEOW_SWIPE_DOWN) return;
    if (g_drag_page || g_drag_list) return;   /* 本次手势已实时跟手滚动过 */
    int del = (dir == MEOW_SWIPE_UP) ? dist : -dist;   /* 手指上移 → 偏移增大 */
    if (g_demo_focus && g_dlc) {
        meow_list_scroll_by(g_dlc, del);
        g_ds.list = meow_list_scroll(g_dlc);
        meow_ui_invalidate(r_list.x, r_list.y, r_list.w, r_list.h);   /* 列表区局部刷新 */
    } else {
        demo_rebuild_to(g_demo_scroll + del);
    }
}

/* ---- demo 页 view（on_enter/on_leave/on_destroy 驱动进入/离开/释放）---- */

static void demo_page_enter(meow_view *v, void *ctx)
{
    (void)v;
    ((demo_ctrl *)ctx)->active = 1;
    g_demo = 1;
    g_demo_focus = 0;
    demo_rebuild_to(0);
    meow_log(MEOW_LOG_INFO, "demo enter scroll=0");
}

static void demo_page_leave(meow_view *v, void *ctx)
{
    (void)v;
    ((demo_ctrl *)ctx)->active = 0;
    g_demo = 0;
}

static void demo_page_destroy(meow_view *v, void *ctx)
{
    (void)v; (void)ctx;
    demo_free_content();   /* 内容控件 + CUSTOM 标题/slider值 */
    chrome_free();         /* chrome（TopAppBar / NavigationBar / FAB） */
}

void demo_init(void)
{
    meow_ui_activity_push(ACT_DEMO);
    chrome_create();       /* chrome 位置/置顶在 chrome.c */
    demo_build_at(0);
    meow_ui_activity_pop();
    g_demo_scroll = 0;
}

int demo_is_active(void)
{
    return g_demo;
}

/* demo view：on_create 建 chrome+内容（一次，owner=ACT_DEMO）；进入时 rebuild 到顶。 */
static void demo_page_create(meow_view *v, void *ctx)
{
    (void)v;
    ((demo_ctrl *)ctx)->view = v;
    demo_init();
}

meow_view *demo_view_create(void)
{
    static const meow_view_hooks h = {
        .on_create  = demo_page_create,
        .on_enter   = demo_page_enter,
        .on_leave   = demo_page_leave,
        .on_destroy = demo_page_destroy,
    };
    return meow_view_create(ACT_DEMO, MEOW_VIEW_ACTIVITY, &h, &g_demo_ctrl);
}