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