Add TouchModes : in Gestures mode, only 1 event is processed for each touchevent. This allows to recognize gesture and handle them in Screens or in DisplayApp.

In Polling mode, X/Y positions are sent continuously to lvgl, allowing to scroll inside a dropdown menu for example.

2 files changed, 93 insertions, 0 deletions

diff --git a/src/DisplayApp/Screens/DropDownDemo.cpp b/src/DisplayApp/Screens/DropDownDemo.cpp
new file mode 100644
index 00000000..735a0cce
--- /dev/null
+++ b/src/DisplayApp/Screens/DropDownDemo.cpp
@@ -0,0 +1,64 @@
+#include <libs/lvgl/lvgl.h>
+#include <libraries/log/nrf_log.h>
+#include "DropDownDemo.h"
+#include "../DisplayApp.h"
+
+using namespace Pinetime::Applications::Screens;
+extern lv_font_t jetbrains_mono_extrabold_compressed;
+extern lv_font_t jetbrains_mono_bold_20;
+
+DropDownDemo::DropDownDemo(Pinetime::Applications::DisplayApp *app) : Screen(app) {
+  // Create the dropdown object, with many item, and fix its height
+  ddlist = lv_ddlist_create(lv_scr_act(), NULL);
+  lv_ddlist_set_options(ddlist, "Apple\n"
+                                "Banana\n"
+                                "Orange\n"
+                                "Melon\n"
+                                "Grape\n"
+                                "Raspberry\n"
+                                "A\n"
+                                "B\n"
+                                "C\n"
+                                "D\n"
+                                "E");
+  lv_ddlist_set_fix_width(ddlist, 150);
+  lv_ddlist_set_draw_arrow(ddlist, true);
+  lv_ddlist_set_fix_height(ddlist, 150);
+  lv_obj_align(ddlist, NULL, LV_ALIGN_IN_TOP_MID, 0, 20);
+}
+
+DropDownDemo::~DropDownDemo() {
+  // Reset the touchmode
+  app->SetTouchMode(DisplayApp::TouchModes::Gestures);
+  lv_obj_clean(lv_scr_act());
+}
+
+bool DropDownDemo::Refresh() {
+  auto* list = static_cast<lv_ddlist_ext_t *>(ddlist->ext_attr);
+
+  // Switch touchmode to Polling if the dropdown is opened. This will allow to scroll inside the
+  // dropdown while it is opened.
+  // Disable the polling mode when the dropdown is closed to be able to handle the gestures.
+  if(list->opened)
+    app->SetTouchMode(DisplayApp::TouchModes::Polling);
+  else
+    app->SetTouchMode(DisplayApp::TouchModes::Gestures);
+  return running;
+}
+
+bool DropDownDemo::OnButtonPushed() {
+  running = false;
+  return true;
+}
+
+bool DropDownDemo::OnTouchEvent(Pinetime::Applications::TouchEvents event) {
+  // If the dropdown is opened, notify Display app that it doesn't need to handle the event
+  // (this will prevent displayApp from going back to the menu or clock scree).
+  auto* list = static_cast<lv_ddlist_ext_t *>(ddlist->ext_attr);
+  if(list->opened) {
+    return true;
+  } else {
+    return false;
+  }
+}
+
diff --git a/src/DisplayApp/Screens/DropDownDemo.h b/src/DisplayApp/Screens/DropDownDemo.h
new file mode 100644
index 00000000..7c75efc0
--- /dev/null
+++ b/src/DisplayApp/Screens/DropDownDemo.h
@@ -0,0 +1,29 @@
+#pragma once
+
+#include <cstdint>
+#include "Screen.h"
+#include <bits/unique_ptr.h>
+#include <libs/lvgl/src/lv_core/lv_style.h>
+#include <libs/lvgl/src/lv_core/lv_obj.h>
+
+namespace Pinetime {
+  namespace Applications {
+    namespace Screens {
+
+      class DropDownDemo : public Screen{
+        public:
+          DropDownDemo(DisplayApp* app);
+          ~DropDownDemo() override;
+
+          bool Refresh() override;
+          bool OnButtonPushed() override;
+          bool OnTouchEvent(TouchEvents event) override;
+
+        private:
+          lv_obj_t * ddlist;
+          bool running = true;
+          bool isDropDownOpened = false;
+      };
+    }
+  }
+}