Add 'examples/hello/' from commit 'e88e5a6ff3b0f55671cb64c0a506e552360010e9'

git-subtree-dir: examples/hello
git-subtree-mainline: f44e3bc6d0
git-subtree-split: e88e5a6ff3

examples/hello/ui/full.c

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+/* ui/full.c — 全屏页（ACT_FULL）view + 控制器。
+ *
+ * 无控件：进入时声明全屏+状态栏收合，绘制 accent 底 + 三行文本；点任意处/左缘左滑回 home。
+ * 页面切换由 meow_view_page_push/pop 驱动 on_enter/on_leave（activity_push/pop 在 page_push/pop 内）。
+ * 注：on_leave 里 activity_active() 仍为 ACT_FULL（activity_pop 在其后），故 OFF 日志的 activity
+ *     id 与旧 set_fullscreen(0) 略异——纯诊断日志差异，功能无变化（见报告）。
+ */
+#include "hello_internal.h"
+
+static full_ctrl g_full_ctrl;
+static int g_full = 0;               /* 1=处于全屏视图 */
+
+void full_draw(void)
+{
+    const meow_theme *th = meow_theme_get();
+    meow_ui_clear(th->accent);
+    meow_ui_text_center(240, 330, "FULLSCREEN ACTIVE", 28, 0xFFFFFF);
+    meow_ui_text_center(240, 366, "tap anywhere = back to home", 20, 0xFFFFFF);
+    meow_ui_text_center(240, 394, "(left-edge swipe also returns)", 20, 0xFFFFFF);
+    meow_ui_flush();
+}
+
+static void full_page_enter(meow_view *v, void *ctx)
+{
+    (void)v;
+    ((full_ctrl *)ctx)->active = 1;
+    g_full = 1;
+    meow_ui_set_fullscreen(1);
+    meow_ui_statusbar_set_collapsed(1);
+    hello_nav_report();       /* ① 上报 full 栈深/顶层 */
+    full_draw();
+    meow_log(MEOW_LOG_INFO, "fullscreen ON (collapsed), activity->%d", meow_ui_activity_active());
+}
+
+static void full_page_leave(meow_view *v, void *ctx)
+{
+    (void)v;
+    ((full_ctrl *)ctx)->active = 0;
+    g_full = 0;
+    meow_ui_set_fullscreen(0);
+    meow_ui_statusbar_set_collapsed(0);
+    meow_log(MEOW_LOG_INFO, "fullscreen OFF (restore), activity->%d", meow_ui_activity_active());
+}
+
+int full_is_active(void)
+{
+    return g_full;
+}
+
+meow_view *full_view_create(void)
+{
+    static const meow_view_hooks h = {
+        .on_enter = full_page_enter,
+        .on_leave = full_page_leave,
+    };
+    return meow_view_create(ACT_FULL, MEOW_VIEW_ACTIVITY, &h, &g_full_ctrl);
+}