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ndg/examples/scroll/lv_example_scroll_2.py

48 lines
1.1 KiB
Python

def sw_event_cb(e,panel):
code = e.get_code()
sw = e.get_target()
if code == lv.EVENT.VALUE_CHANGED:
if sw.has_state(lv.STATE.CHECKED):
panel.add_flag(lv.obj.FLAG.SCROLL_ONE)
else:
panel.clear_flag(lv.obj.FLAG.SCROLL_ONE)
#
# Show an example to scroll snap
#
panel = lv.obj(lv.scr_act())
panel.set_size(280, 150)
panel.set_scroll_snap_x(lv.SCROLL_SNAP.CENTER)
panel.set_flex_flow(lv.FLEX_FLOW.ROW)
panel.center()
for i in range(10):
btn = lv.btn(panel)
btn.set_size(150, 100)
label = lv.label(btn)
if i == 3:
label.set_text("Panel {:d}\nno snap".format(i))
btn.clear_flag(lv.obj.FLAG.SNAPPABLE)
else:
label.set_text("Panel {:d}".format(i))
label.center()
panel.update_snap(lv.ANIM.ON)
# Switch between "One scroll" and "Normal scroll" mode
sw = lv.switch(lv.scr_act())
sw.align(lv.ALIGN.TOP_RIGHT, -20, 10)
sw.add_event_cb(lambda evt: sw_event_cb(evt,panel), lv.EVENT.ALL, None)
label = lv.label(lv.scr_act())
label.set_text("One scroll")
label.align_to(sw, lv.ALIGN.OUT_BOTTOM_MID, 0, 5)