examples(micropython): add a few missing MP examples (#3672)

2022-09-21 11:21:36 +02:00
parent d5e6ffdd87
commit 29ec34be77
16 changed files with 1151 additions and 27 deletions
--- a/examples/others/msg/lv_example_msg_3.py
+++ b/examples/others/msg/lv_example_msg_3.py
@@ -0,0 +1,122 @@
+# Define a message ID
+MSG_INC            = 1
+MSG_DEC            = 2
+MSG_SET            = 3
+MSG_UPDATE         = 4
+MSG_UPDATE_REQUEST = 5
+
+# Define the object that will be sent as msg payload
+class NewValue:
+    def __init__(self, value):
+        self.value = value
+    def __repr__(self):
+        return f"{self.value} %"
+class LV_Example_Msg_2:
+    
+    def __init__(self):
+        self.value = 10
+        lv.msg_subscribe(MSG_INC, self.value_handler, None)
+        lv.msg_subscribe(MSG_DEC, self.value_handler, None)
+        lv.msg_subscribe(MSG_SET, self.value_handler, None)
+        lv.msg_subscribe(MSG_UPDATE, self.value_handler, None)
+        lv.msg_subscribe(MSG_UPDATE_REQUEST, self.value_handler, None)
+
+        panel = lv.obj(lv.scr_act())
+        panel.set_size(250, lv.SIZE_CONTENT)
+        panel.center()
+        panel.set_flex_flow(lv.FLEX_FLOW.ROW)
+        panel.set_flex_align(lv.FLEX_ALIGN.SPACE_BETWEEN, lv.FLEX_ALIGN.CENTER, lv.FLEX_ALIGN.START)
+
+        # Up button
+        btn = lv.btn(panel)
+        btn.set_flex_grow(1)
+        btn.add_event_cb(self.btn_event_cb, lv.EVENT.ALL, None)
+        label = lv.label(btn)
+        label.set_text(lv.SYMBOL.LEFT)
+        label.center()
+        
+        # Current value
+        label = lv.label(panel)
+        label.set_flex_grow(2)
+        label.set_style_text_align(lv.TEXT_ALIGN.CENTER, 0)
+        label.set_text("?")
+        lv.msg_subscribe_obj(MSG_UPDATE, label, None)
+        label.add_event_cb(self.label_event_cb, lv.EVENT.MSG_RECEIVED, None)
+        
+        # Down button
+        btn = lv.btn(panel)
+        btn.set_flex_grow(1)
+        btn.add_event_cb(self.btn_event_cb, lv.EVENT.ALL, None)
+        label = lv.label(btn)
+        label.set_text(lv.SYMBOL.RIGHT)
+        label.center()
+        
+        # Slider
+        slider = lv.slider(panel)
+        slider.set_flex_grow(1)
+        slider.add_flag(lv.OBJ_FLAG_FLEX_IN_NEW_TRACK)
+        slider.add_event_cb(self.slider_event_cb, lv.EVENT.ALL, None)
+        lv.msg_subscribe_obj(MSG_UPDATE, slider, None)
+        
+        
+        # As there are new UI elements that don't know the system's state
+        # send an UPDATE REQUEST message which will trigger an UPDATE message with the current value
+        lv.msg_send(MSG_UPDATE_REQUEST, None)
+        
+    def value_handler(self,m):
+        old_value = self.value
+        id = m.get_id()
+        if id == MSG_INC:
+            if self.value < 100:
+                self.value +=1
+        elif id == MSG_DEC:
+            if self.value > 0:
+                self.value -=1
+        elif id == MSG_SET:
+            payload = m.get_payload()
+            new_value=payload.__cast__()
+            self.value = new_value.value
+            # print("value_handler: new value: {:d}".format(new_value.value)) 
+        elif id == MSG_UPDATE_REQUEST:
+            lv.msg_send(MSG_UPDATE, NewValue(self.value))
+         
+        if self.value != old_value: 
+                lv.msg_send(MSG_UPDATE, NewValue(self.value));
+            
+    def btn_event_cb(self,e):
+        btn = e.get_target()
+        code = e.get_code()
+        if code == lv.EVENT.CLICKED or code == lv.EVENT.LONG_PRESSED_REPEAT:
+            if btn.get_index() == 0:      # rst object is the dec. button
+                lv.msg_send(MSG_DEC, None)
+            else :
+                lv.msg_send(MSG_INC, None)
+
+    def label_event_cb(self,e):
+        label = e.get_target()
+        code = e.get_code()
+        if code == lv.EVENT.MSG_RECEIVED:
+            m = e.get_msg()
+            if m.get_id() == MSG_UPDATE:
+                payload = m.get_payload()
+                value=payload.__cast__()
+                # print("label_event_cb: " + str(value))
+                label.set_text(str(value))
+
+    def slider_event_cb(self,e):
+        slider = e.get_target()
+        code = e.get_code()
+        if code == lv.EVENT.VALUE_CHANGED:
+            v = slider.get_value()
+            # print("slider_event_cb: {:d}".format(v))
+            lv.msg_send(MSG_SET, NewValue(v))
+        
+        elif code == lv.EVENT.MSG_RECEIVED:
+            m = e.get_msg()
+            if m.get_id() == MSG_UPDATE:
+                v = m.get_payload()
+                value = v.__cast__()
+                slider.set_value(value.value, lv.ANIM.OFF)
+
+lv_example_msg_2 = LV_Example_Msg_2()
+