GUI: Add selection by keyboard.

Author: gabordemooij

plugins/gui/lvgl_static/src/drivers/sdl/lv_sdl_keyboard.c

@@ -98,6 +98,7 @@ static void release_indev_cb(lv_event_t * e)
     }
 }
 int lv_sdl_keyboard_ctrl_pressed = 0;
+int lv_sdl_keyboard_shift_pressed = 0;
 
 void lv_sdl_keyboard_handler(SDL_Event * event)
 {
@@ -106,6 +107,9 @@ void lv_sdl_keyboard_handler(SDL_Event * event)
         case SDL_KEYDOWN:
             win_id = event->key.windowID;
             break;
+        case SDL_KEYUP:
+            win_id = event->key.windowID;
+            break;
         case SDL_TEXTINPUT:
             win_id = event->text.windowID;
             break;
@@ -131,11 +135,21 @@ void lv_sdl_keyboard_handler(SDL_Event * event)
     /* We only care about SDL_KEYDOWN and SDL_TEXTINPUT events */
     switch(event->type) {
         case SDL_KEYUP: {
-           if ( event->key.keysym.sym == SDLK_LCTRL ) {
+		   if ( event->key.keysym.sym == SDLK_LCTRL ) {
                lv_sdl_keyboard_ctrl_pressed = 0;
            }
+           else if ( event->key.keysym.sym == SDLK_LSHIFT ) {
+               lv_sdl_keyboard_shift_pressed = 0;
+               return;
+           }
+           else {
+			return;
+		   }
         }
         case SDL_KEYDOWN: {                     /*Button press*/
+				if ( event->key.keysym.sym == SDLK_LSHIFT ) {
+                    lv_sdl_keyboard_shift_pressed = 1;
+                }
                 if ( event->key.keysym.sym == SDLK_LCTRL ) {
                     lv_sdl_keyboard_ctrl_pressed = 1;
                 }
@@ -183,6 +197,20 @@ static uint32_t keycode_to_ctrl_key(SDL_Keycode sdl_key)
                 return LV_KEY_SELECT_ALL;
         }
     }
+
+    if (lv_sdl_keyboard_shift_pressed) {
+        switch(sdl_key) {
+            case SDLK_RIGHT:
+                return LV_KEY_SELECT_RIGHT;
+            case SDLK_LEFT:
+                return LV_KEY_SELECT_LEFT;
+            case SDLK_UP:
+                return LV_KEY_SELECT_UP;
+            case SDLK_DOWN:
+                return LV_KEY_SELECT_DOWN;
+        }
+    }
+
     /*Remap some key to LV_KEY_... to manage groups*/
     switch(sdl_key) {
         case SDLK_RIGHT:

plugins/gui/lvgl_static/src/widgets/textarea/lv_textarea.c

@@ -854,6 +854,44 @@ void lv_textarea_selection_all(lv_obj_t * obj) {
 #endif
 }
 
+void lv_textarea_selection_start(lv_obj_t * obj) {
+    LV_ASSERT_OBJ(obj, MY_CLASS);
+#if LV_LABEL_TEXT_SELECTION
+    lv_textarea_t * ta = (lv_textarea_t *)obj;
+    if (!ta->text_sel_in_prog) {
+		lv_textarea_clear_selection(ta);
+		lv_label_set_text_selection_start(ta->label, lv_textarea_get_cursor_pos(obj));
+		ta->text_sel_in_prog = 1;
+	}
+#else
+    LV_UNUSED(obj); /*Unused*/
+#endif
+}
+
+void lv_textarea_selection_stop(lv_obj_t * obj) {
+    LV_ASSERT_OBJ(obj, MY_CLASS);
+#if LV_LABEL_TEXT_SELECTION
+	lv_textarea_t * ta = (lv_textarea_t *)obj;
+    if (ta->text_sel_in_prog) {
+	  ta->text_sel_in_prog = 0;
+	}
+#else
+    LV_UNUSED(obj); /*Unused*/
+#endif
+}
+
+void lv_textarea_selection_continue(lv_obj_t * obj) {
+    LV_ASSERT_OBJ(obj, MY_CLASS);
+#if LV_LABEL_TEXT_SELECTION
+    lv_textarea_t * ta = (lv_textarea_t *)obj;
+    if (ta->text_sel_in_prog) {
+		lv_label_set_text_selection_end(ta->label, lv_textarea_get_cursor_pos(obj));
+	}
+#else
+    LV_UNUSED(obj); /*Unused*/
+#endif
+}
+
 void lv_textarea_cursor_right(lv_obj_t * obj)
 {
     LV_ASSERT_OBJ(obj, MY_CLASS);
@@ -1001,13 +1039,45 @@ static void lv_textarea_event(const lv_obj_class_t * class_p, lv_event_t * e)
     lv_event_code_t code = lv_event_get_code(e);
     lv_obj_t * obj = lv_event_get_current_target(e);
 
+	if(code == LV_EVENT_KEY) {
+		uint32_t c = *((uint32_t *)lv_event_get_param(e)); /*uint32_t because can be UTF-8*/
+		if (
+		c != LV_KEY_SELECT_RIGHT &&
+		c != LV_KEY_SELECT_LEFT &&
+		c != LV_KEY_SELECT_UP &&
+		c != LV_KEY_SELECT_DOWN
+		) {
+			lv_textarea_selection_stop(obj);
+		}
+	}
+
     if(code == LV_EVENT_FOCUSED) {
         start_cursor_blink(obj);
     }
     else if(code == LV_EVENT_KEY) {
         uint32_t c = *((uint32_t *)lv_event_get_param(e)); /*uint32_t because can be UTF-8*/
         if (c == LV_KEY_SELECT_ALL)
             lv_textarea_selection_all(obj);
+        else if (c == LV_KEY_SELECT_RIGHT) {
+            lv_textarea_selection_start(obj);
+            lv_textarea_cursor_right(obj);
+            lv_textarea_selection_continue(obj);
+		}
+		else if (c == LV_KEY_SELECT_LEFT) {
+            lv_textarea_selection_start(obj);
+            lv_textarea_cursor_left(obj);
+            lv_textarea_selection_continue(obj);
+		}
+		else if (c == LV_KEY_SELECT_UP) {
+            lv_textarea_selection_start(obj);
+            lv_textarea_cursor_up(obj);
+            lv_textarea_selection_continue(obj);
+		}
+		else if (c == LV_KEY_SELECT_DOWN) {
+            lv_textarea_selection_start(obj);
+            lv_textarea_cursor_down(obj);
+            lv_textarea_selection_continue(obj);
+		}
         else if(c == LV_KEY_RIGHT)
             lv_textarea_cursor_right(obj);
         else if(c == LV_KEY_LEFT)