You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
72 lines
2.1 KiB
Python
72 lines
2.1 KiB
Python
import gc
|
|
import lvgl as lv
|
|
from imagetools import get_png_info, open_png
|
|
|
|
# Register PNG image decoder
|
|
decoder = lv.img.decoder_create()
|
|
decoder.info_cb = get_png_info
|
|
decoder.open_cb = open_png
|
|
|
|
# Measure memory usage
|
|
gc.enable()
|
|
gc.collect()
|
|
mem_free = gc.mem_free()
|
|
|
|
label = lv.label(lv.scr_act())
|
|
label.align(lv.ALIGN.BOTTOM_MID, 0, -10)
|
|
label.set_text(" memory free:" + str(mem_free/1024) + " kB")
|
|
|
|
# Create an image from the png file
|
|
try:
|
|
with open('../../assets/img_star.png','rb') as f:
|
|
png_data = f.read()
|
|
except:
|
|
print("Could not find star.png")
|
|
sys.exit()
|
|
|
|
img_star = lv.img_dsc_t({
|
|
'data_size': len(png_data),
|
|
'data': png_data
|
|
})
|
|
|
|
def event_cb(e, snapshot_obj):
|
|
img = e.get_target()
|
|
|
|
if snapshot_obj:
|
|
# no need to free the old source for snapshot_obj, gc will free it for us.
|
|
|
|
# take a new snapshot, overwrite the old one
|
|
dsc = lv.snapshot_take(img.get_parent(), lv.img.CF.TRUE_COLOR_ALPHA)
|
|
snapshot_obj.set_src(dsc)
|
|
|
|
gc.collect()
|
|
mem_used = mem_free - gc.mem_free()
|
|
label.set_text("memory used:" + str(mem_used/1024) + " kB")
|
|
|
|
root = lv.scr_act()
|
|
root.set_style_bg_color(lv.palette_main(lv.PALETTE.LIGHT_BLUE), 0)
|
|
|
|
# Create an image object to show snapshot
|
|
snapshot_obj = lv.img(root)
|
|
snapshot_obj.set_style_bg_color(lv.palette_main(lv.PALETTE.PURPLE), 0)
|
|
snapshot_obj.set_style_bg_opa(lv.OPA.COVER, 0)
|
|
snapshot_obj.set_zoom(128)
|
|
|
|
# Create the container and its children
|
|
container = lv.obj(root)
|
|
container.align(lv.ALIGN.CENTER, 0, 0)
|
|
container.set_size(180, 180)
|
|
container.set_flex_flow(lv.FLEX_FLOW.ROW_WRAP)
|
|
container.set_flex_align(lv.FLEX_ALIGN.SPACE_EVENLY, lv.FLEX_ALIGN.CENTER, lv.FLEX_ALIGN.CENTER)
|
|
container.set_style_radius(50, 0)
|
|
|
|
for i in range(4):
|
|
img = lv.img(container)
|
|
img.set_src(img_star)
|
|
img.set_style_bg_color(lv.palette_main(lv.PALETTE.GREY), 0)
|
|
img.set_style_bg_opa(lv.OPA.COVER, 0)
|
|
img.set_style_transform_zoom(400, lv.STATE.PRESSED)
|
|
img.add_flag(img.FLAG.CLICKABLE)
|
|
img.add_event_cb(lambda e: event_cb(e, snapshot_obj), lv.EVENT.PRESSED, None)
|
|
img.add_event_cb(lambda e: event_cb(e, snapshot_obj), lv.EVENT.RELEASED, None)
|