"""
display all images in a directory as thumbnail image buttons that display
the full image when clicked; requires PIL for JPEGs and thumbnail image
creation; to do: add scrolling if too many thumbs for window!
"""
import os, sys, math
from tkinter import *
from PIL import Image # <== required for thumbs
from PIL.ImageTk import PhotoImage # <== required for JPEG display
def makeThumbs(imgdir, size=(100, 100), subdir='thumbs'):
"""
get thumbnail images for all images in a directory; for each image, create
and save a new thumb, or load and return an existing thumb; makes thumb
dir if needed; returns a list of (image filename, thumb image object);
caller can also run listdir on thumb dir to load; on bad file types may
raise IOError, or other; caveat: could also check file timestamps;
"""
thumbdir = os.path.join(imgdir, subdir)
if not os.path.exists(thumbdir):
os.mkdir(thumbdir)
thumbs = []
for imgfile in os.listdir(imgdir):
thumbpath = os.path.join(thumbdir, imgfile)
if os.path.exists(thumbpath):
thumbobj = Image.open(thumbpath) # use already created
thumbs.append((imgfile, thumbobj))
else:
print('making', thumbpath)
imgpath = os.path.join(imgdir, imgfile)
try:
imgobj = Image.open(imgpath) # make new thumb
imgobj.thumbnail(size, Image.ANTIALIAS) # best downsize filter
imgobj.save(thumbpath) # type via ext or passed
thumbs.append((imgfile, imgobj))
except: # not always IOError
print("Skipping: ", imgpath)
return thumbs
class ViewOne(Toplevel):
"""
open a single image in a pop-up window when created; photoimage
object must be saved: images are erased if object is reclaimed;
"""
def init(self, imgdir, imgfile):
Toplevel.init(self)
self.title(imgfile)
imgpath = os.path.join(imgdir, imgfile)
imgobj = PhotoImage(file=imgpath)
Label(self, image=imgobj).pack()
print(imgpath, imgobj.width(), imgobj.height()) # size in pixels
self.savephoto = imgobj # keep reference on me
def viewer(imgdir, kind=Toplevel, cols=None):
"""
make thumb links window for an image directory: one thumb button per image;
use kind=Tk to show in main app window, or Frame container (pack); imgfile
differs per loop: must save with a default; photoimage objs must be saved:
erased if reclaimed; packed row frames (versus grids, fixed-sizes, canvas);
"""
win = kind()
win.title('Viewer: ' + imgdir)
quit = Button(win, text='Quit', command=win.quit, bg='beige') # pack first
quit.pack(fill=X, side=BOTTOM) # so clip last
thumbs = makeThumbs(imgdir)
if not cols:
cols = int(math.ceil(math.sqrt(len(thumbs)))) # fixed or N x N
savephotos = []
while thumbs:
thumbsrow, thumbs = thumbs[:cols], thumbs[cols:]
row = Frame(win)
row.pack(fill=BOTH)
for (imgfile, imgobj) in thumbsrow:
photo = PhotoImage(imgobj)
link = Button(row, image=photo)
handler = lambda savefile=imgfile: ViewOne(imgdir, savefile)
link.config(command=handler)
link.pack(side=LEFT, expand=YES)
savephotos.append(photo)
return win, savephotos
if name == 'main':
imgdir = (len(sys.argv) > 1 and sys.argv[1]) or 'images'
main, save = viewer(imgdir, kind=Tk)
main.mainloop()
不保存缩略图
"""
same, but make thumb images in memory without saving to or loading from files:
seems just as fast for small directories, but saving to files makes startup much
quicker for large image collections; saving may be needed in some apps (web pages)
"""
import os, sys
from PIL import Image
from tkinter import Tk
import viewer_thumbs
def makeThumbs(imgdir, size=(100, 100), subdir='thumbs'):
"""
create thumbs in memory but don't cache to files
"""
thumbs = []
for imgfile in os.listdir(imgdir):
imgpath = os.path.join(imgdir, imgfile)
try:
imgobj = Image.open(imgpath) # make new thumb
imgobj.thumbnail(size)
thumbs.append((imgfile, imgobj))
except:
print("Skipping: ", imgpath)
return thumbs
if name == 'main':
imgdir = (len(sys.argv) > 1 and sys.argv[1]) or 'images'
viewer_thumbs.makeThumbs = makeThumbs
main, save = viewer_thumbs.viewer(imgdir, kind=Tk)
main.mainloop()
