Extend app input planning to UI state

src/app_events.cpp

@@ -661,15 +661,34 @@ bool App::key_char(char key)
 
 void App::toggle_ui()
 {
-    auto m = layout[main_id]->m_children[1];
-    ui_visible = !ui_visible;
-    for (int i = 1; i < m->m_children.size(); i++)
-        m->m_children[i]->m_display = ui_visible;
+    auto* main = layout[main_id];
+    const std::size_t main_child_count = main ? main->m_children.size() : 0U;
+    auto* panel_container = main_child_count > 1U ? main->m_children[1].get() : nullptr;
+    const auto plan = pp::app::plan_app_ui_visibility_toggle(
+        ui_visible,
+        main != nullptr,
+        main_child_count,
+        panel_container ? panel_container->m_children.size() : 0U);
+    if (!plan) {
+        LOG("UI toggle plan failed: %s", plan.status().message);
+        return;
+    }
+
+    ui_visible = plan.value().next_ui_visible;
+    if (!panel_container)
+        return;
+
+    for (std::size_t i = plan.value().first_panel_child_index;
+         i < plan.value().panel_child_count;
+         ++i) {
+        panel_container->m_children[i]->m_display = ui_visible;
+    }
 }
 
 void App::set_stylus()
 {
-    has_stylus = true;
-    if (canvas)
+    const auto plan = pp::app::plan_app_stylus_attach(canvas != nullptr);
+    has_stylus = plan.set_has_stylus;
+    if (plan.enable_canvas_touch_lock && canvas)
         canvas->m_canvas->m_touch_lock = true;
 }