Add Display::set_text.

esp/cpp/07_lcd-panel/main/display.cpp

@@ -1,4 +1,5 @@
 #include "display.h"
+#include "widgets/label/lv_label.h"
 
 #include <esp_log.h>
 #include <esp_lcd_panel_ops.h>
@@ -97,6 +98,28 @@ Display::Display(const I2C &i2c) :
               nullptr, LVGL_TASK_PRIORITY, nullptr);
 }
 
+void Display::set_text(const char *text,
+                       const char *name,
+                       lv_label_long_mode_t long_mode,
+                       lv_align_t align)
+{
+  // Lock the mutex due to the LVGL APIs are not thread-safe.
+  ScopedLock lock;
+
+  ESP_LOGI(TAG, "Display LVGL Scroll Text");
+  lv_obj_t *scr = lv_display_get_screen_active(display_);
+  objects_[name] = lv_label_create(scr);
+  // Circular scroll
+  lv_label_set_long_mode(objects_[name], long_mode);
+  lv_label_set_text(objects_[name], text);
+
+  // Set the size of the screen.
+  // If you use rotation 90 or 270 use lv_display_get_vertical_resolution.
+  lv_obj_set_width(objects_[name],
+                   lv_display_get_horizontal_resolution(display_));
+  lv_obj_align(objects_[name], align, 0, 0);
+}
+
 bool Display::lvgl_flush_ready(esp_lcd_panel_io_handle_t,
                                esp_lcd_panel_io_event_data_t *,
                                void *user_ctx)

esp/cpp/07_lcd-panel/main/display.h

@@ -5,9 +5,11 @@
 #include <esp_lcd_panel_ssd1306.h>
 #include <driver/i2c_types.h>
 #include <driver/i2c_master.h>
+#include <unordered_map>
 #include "misc/lv_types.h"
 #include "misc/lv_area.h"
 #include "display/lv_display.h"
+#include "widgets/label/lv_label.h"
 
 #define I2C_BUS_PORT  0
 #define LVGL_TICK_PERIOD_MS    5
@@ -66,6 +68,11 @@ public:
 
   [[nodiscard]] inline lv_display_t *operator*() { return get(); }
 
+  void set_text(const char *text,
+                const char *name,
+                lv_label_long_mode_t long_mode = LV_LABEL_LONG_SCROLL_CIRCULAR,
+                lv_align_t align = LV_ALIGN_TOP_MID);
+
   static bool lvgl_flush_ready(esp_lcd_panel_io_handle_t panel,
                                esp_lcd_panel_io_event_data_t *data,
                                void *user_ctx);
@@ -93,6 +100,8 @@ protected:
 private:
 //  virtual void *vendor_config() = 0;
 
+  std::unordered_map<const char*, lv_obj_t*> objects_;
+
   lv_display_t *display_;
 
   void *vendor_config_;

esp/cpp/07_lcd-panel/main/main.cpp

@@ -1,31 +1,22 @@
 #include "display.h"
 
-#include "esp_log.h"
-#include "lvgl.h"
-
 I2C i2c;
 
 void setup()
 {
   Display d(i2c);
 
-  // UI function scope.
+  d.set_text("Test test 12345678910",
-  {
+             "test-text1",
-    // Lock the mutex due to the LVGL APIs are not thread-safe
+             LV_LABEL_LONG_SCROLL,
-    ScopedLock lock;
+             LV_ALIGN_CENTER);
 
-    ESP_LOGI(TAG, "Display LVGL Scroll Text");
+  d.set_text("Hello hello hello hello hello hello hello hello!", "test-text2");
-    lv_obj_t *scr = lv_display_get_screen_active(d.get());
-    lv_obj_t *label = lv_label_create(scr);
-    // Circular scroll
-    lv_label_set_long_mode(label, LV_LABEL_LONG_SCROLL_CIRCULAR);
-    lv_label_set_text(label, "Hello hello hello hello hello hello hello.");
 
-    // Size of the screen
+  d.set_text("A random sentence with no meaning at all.",
-    // if you use rotation 90 or 270 use lv_display_get_vertical_resolution
+             "test-text3",
-    lv_obj_set_width(label, lv_display_get_horizontal_resolution(*d));
+             LV_LABEL_LONG_CLIP,
-    lv_obj_align(label, LV_ALIGN_TOP_MID, 0, 0);
+             LV_ALIGN_BOTTOM_MID);
-  }
 }
 
 void loop() { }