adding micropython examples (#2286)

* adding micropython examples

* adding micropython examples

examples/event/lv_example_event_1.py

@@ -0,0 +1,25 @@
+class Event_1():
+    def __init__(self):
+        self.cnt = 1
+        #
+        # Add click event to a button
+        #
+
+        btn = lv.btn(lv.scr_act())
+        btn.set_size(100, 50)
+        btn.center()
+        btn.add_event_cb(self.event_cb, lv.EVENT.CLICKED, None)
+        
+        label = lv.label(btn)
+        label.set_text("Click me!");
+        label.center()
+
+    def event_cb(self,e):
+        print("Clicked");
+            
+        btn = lv.btn.__cast__(e.get_target())
+        label = btn.get_child(0)
+        label.set_text(str(self.cnt))
+        self.cnt += 1
+
+evt1 = Event_1()

examples/event/lv_example_event_2.py

@@ -0,0 +1,22 @@
+def event_cb(e,label):
+    code = e.get_code()
+    if code == lv.EVENT.PRESSED:
+        label.set_text("The last button event:\nLV_EVENT_PRESSED")
+    elif code == lv.EVENT.CLICKED:
+        label.set_text("The last button event:\nLV_EVENT_CLICKED")
+    elif code ==  lv.EVENT.LONG_PRESSED:
+        label.set_text("The last button event:\nLV_EVENT_LONG_PRESSED")
+    elif code == lv.EVENT.LONG_PRESSED_REPEAT:
+        label.set_text("The last button event:\nLV_EVENT_LONG_PRESSED_REPEAT")        
+btn = lv.btn(lv.scr_act())
+btn.set_size(100, 50)
+btn.center()
+
+btn_label = lv.label(btn)
+btn_label.set_text("Click me!")
+btn_label.center()
+
+info_label = lv.label(lv.scr_act())
+info_label.set_text("The last button event:\nNone");
+
+btn.add_event_cb(lambda e: event_cb(e,info_label), lv.EVENT.ALL, None)

examples/event/lv_example_event_3.py

@@ -0,0 +1,31 @@
+def event_cb(e):
+
+    # The original target of the event. Can be the buttons or the container
+    target = e.get_target()
+    # print(type(target))
+
+    # If container was clicked do nothing
+    if type(target) != type(lv.btn()):
+        return
+
+    # Make the clicked buttons red
+    target.set_style_bg_color(lv.palette_main(lv.PALETTE.RED), 0)
+
+#
+# Demonstrate event bubbling
+#
+
+cont = lv.obj(lv.scr_act())
+cont.set_size(320, 200)
+cont.center()
+cont.set_flex_flow(lv.FLEX_FLOW.ROW_WRAP)
+
+for i in range(30):
+    btn = lv.btn(cont)
+    btn.set_size(80, 50)
+    btn.add_flag(lv.obj.FLAG.EVENT_BUBBLE)
+
+    label = lv.label(btn)
+    label.set_text(str(i))
+    label.center()
+    cont.add_event_cb(event_cb, lv.EVENT.CLICKED, None)