88 lines
3.0 KiB
Python
88 lines
3.0 KiB
Python
#!/usr/bin/env python
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import PySimpleGUI as sg
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from PIL import Image
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import PIL
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import io
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import base64
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import os
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from typing import Union, Tuple
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"""
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Demo Image Album.... displays images on Graph Element and transitions
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by sliding them across. Click on right side of image to navigate down through filenames, left side for up.
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Contains a couple of handy PIL-based image functions that resize an image while maintaining correct proportion.
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One you pass a filename, the other a BASE64 string.
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Copyright 2020 PySimpleGUI.org
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"""
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G_SIZE = (800,600)
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def convert_to_bytes(file_or_bytes, resize=None):
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'''
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Will convert into bytes and optionally resize an image that is a file or a base64 bytes object.
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:param file_or_bytes: either a string filename or a bytes base64 image object
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:type file_or_bytes: (Union[str, bytes])
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:param resize: optional new size
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:type resize: (Tuple[int, int] or None)
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:return: (bytes) a byte-string object
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:rtype: (bytes)
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'''
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if isinstance(file_or_bytes, str):
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img = PIL.Image.open(file_or_bytes)
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else:
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img = PIL.Image.open(io.BytesIO(base64.b64decode(file_or_bytes)))
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cur_width, cur_height = img.size
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if resize:
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new_width, new_height = resize
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scale = min(new_height/cur_height, new_width/cur_width)
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img = img.resize((int(cur_width*scale), int(cur_height*scale)), PIL.Image.ANTIALIAS)
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bio = io.BytesIO()
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img.save(bio, format="PNG")
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del img
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return bio.getvalue()
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folder = sg.popup_get_folder('Where are your images?')
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if not folder:
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exit(0)
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file_list = os.listdir(folder)
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fnames = [f for f in file_list if os.path.isfile(
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os.path.join(folder, f)) and f.lower().endswith((".png", ".jpg", "jpeg", ".tiff", ".bmp", ".gif", ".ico"))]
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num_files = len(fnames)
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graph = sg.Graph(canvas_size=G_SIZE, graph_bottom_left=(0, 0), graph_top_right=G_SIZE, enable_events=True, key='-GRAPH-')
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layout = [[graph]]
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window = sg.Window('Scrolling Image Viewer', layout, margins=(0,0), element_padding=(0,0), use_default_focus=False, finalize=True)
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window.read()
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offset, move_amount, direction = 0, 5, 'left'
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while True:
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file_to_display = os.path.join(folder, fnames[offset])
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img_data = convert_to_bytes(file_to_display, resize=G_SIZE)
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id = graph.draw_image(data=img_data, location=(0, G_SIZE[1]))
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event, values = window.read()
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if event == sg.WIN_CLOSED:
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break
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if event in ('<', '>'):
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direction = 'left' if event == '<' else 'right'
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elif event == '-GRAPH-':
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direction = 'left' if values['-GRAPH-'][0] < (G_SIZE[0] // 2) else 'right'
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for i in range(G_SIZE[0]//move_amount):
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graph.move_figure(id, -move_amount if direction == 'left' else move_amount, 0)
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window.read(timeout=0)
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graph.delete_figure(id)
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if direction == 'left':
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offset = (offset + (num_files - 1)) % num_files # Decrement - roll over to MAX from 0
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else:
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offset = (offset + 1) % num_files # Increment to MAX then roll over to 0
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window.close() |