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