我一直试图弄清楚如何使用如何在我的GUI中放置一个mainloop（），这样我就不再需要一段时间（True）了。
我的代码底部是我如何使用此代码的示例。我知道这需要经过很多代码，所以感谢任何帮助
# Imports
import os
import os.path
import sys
import tkinter
tk = tkinter
from tkinter import font
#----- Set flag for JPEG support ---
noJPEG = False
try:
from PIL import Image
Pimg = Image
from PIL import ImageTk
Pimgtk = ImageTk
from PIL import ImageDraw
except ImportError:
noJPEG = True
#-----------------------------------
#
# Create an invisible global parent window to hold all children.
# Allows for easy closing of all windows by mouse click. If not
# closed programmatically, program exits if all windows are
# manually closed.
_root = tk.Tk()
_root.withdraw()
###
class ImageView(tk.Canvas):
def __init__(self, image, title, lotDiogram):
is_Diogram = lotDiogram
master = tk.Toplevel(_root) #sets master as a subwindow of _root
master.protocol("WM_DELETE_WINDOW", self.close)
if(is_Diogram == True):
"""When 'is_Diogram' is True, it means image is a
parking lot diogram, and does need scrollbars
added to its Toplevel"""
tk.Canvas.__init__(self, master,
width = 650, height = 525,
scrollregion=(0,0,image.getWidth(),
image.getHeight()))
self.master.title(title)
# Scrollbar added to master
vsb = tk.Scrollbar(master, orient="vertical", command=self.yview)
hsb = tk.Scrollbar(master, orient="horizontal", command=self.xview)
self.configure(yscrollcommand=vsb.set, xscrollcommand=hsb.set)
self.grid(row=0, column=0, sticky="nswe")
vsb.grid(row=0, column=1, sticky="ns")
hsb.grid(row=1, column=0, sticky="ew")
master.grid_rowconfigure(0, weight=1)
master.grid_columnconfigure(0, weight=1)
master.minsize(width=600, height=500)
master.maxsize(width = image.getWidth(),
height = image.getHeight() )
self.foreground = "black"
self.image = image
self.height = image.getHeight()
self.width = image.getWidth()
self.mouseX = None
self.mouseY = None
self.bind("<Button-1>", self.onClick)
self.tags = None
_root.update() #redraw global window
else:
"""When 'is_Diogram' is False, it means image is a
lot sign, and does not need scrollbars
added to its Toplevel"""
tk.Canvas.__init__(self, master, width = image.getWidth(),
height = image.getHeight() )
self.master.title(title)
self.pack()
master.resizable(0,0)
self.foreground = "black"
self.image = image
self.height = image.getHeight()
self.width = image.getWidth()
self.mouseX = None
self.mouseY = None
self.bind("<Button-1>", self.onClick)
self.tags = None
_root.update() #redraw global window
def close(self):
"""Close a window."""
self.master.destroy()
self.quit()
_root.update()
def getMouseXY(self):
"""Return a tuple with x,y position in the image of the
mouse click."""
self.mouseX = None
self.mouseY = None
while (self.mouseX == None) or (self.mouseY == None) :
self.update()
return ((self.mouseX,self.mouseY))
def onClick(self, event):
"""Perform various functions when mouse is clicked."""
self.mouseX = int(self.canvasx(event.x))
self.mouseY = int(self.canvasy(event.y))
def drawShape(self, shape, tagz=None, txt=None, tfont="TkDefaultFont",
color1=None, color2=None, coords=None, w=None, OL=None):
"""Draws a shape, assigns it a tag, and binds the tag to a
mouse click."""
self.tags = tagz
if shape == 'rectangle':
"""Only will accept 2 pairs of XY coordinates, X0, Y0, X1, Y1)"""
self.create_rectangle(coords, fill = color1,
activefill = color2, tags = tagz)
elif shape == 'polygon':
"""Polygon will accept a minimum of 4 XY coordinate pairs"""
self.create_polygon(coords, fill = color1,
activefill = color2, outline = OL,
tags = tagz)
else: #should never get here since shape is required
print("No shape specified!")
_root.update() #redraw global window
def getTags(self):
self.getMouseXY()
obj = self.find_closest(self.mouseX, self.mouseY)
return self.gettags(obj)
def getHeight(self):
"""Return the height of the window."""
return self.height
def getWidth(self):
"""Return the width of the window."""
return self.width
class imagesMSUError(Exception):
def __init__(self, value):
self.value = value
def __str__(self):
return repr(self.value)
#------------------------------------------------------
class Image(object):
def __init__(self, file_or_type, *args):
global noJPEG
try:
if type(file_or_type) != str:
raise imagesMSUError(str(file_or_type))
except imagesMSUError as e:
print('imagesMSU_Error: "' + e.value + '" is not a '
+ 'valid image type or a valid GIF/JPG filename.')
sys.exit(1)
# If an image type was passed in, create a blank image
# of that type.
self.type = file_or_type.upper()
if self.type == 'GIF' or self.type == 'JPG':
# Create blank image; *args are width, height.
self.width, self.height = args
self.filename = 'blank' #default filename for saving
if self.type == 'GIF': #create blank gif
self.image = tk.PhotoImage(master =_root,
width = self.width,
height = self.height)
if self.type == 'JPG': #create blank jpg
try:
if noJPEG: #libjpeg not installed
raise imagesMSUError(noJPEG)
except imagesMSUError as e:
print('imagesMSU_Error: Support library for JPEGs '
+ 'not found. Use GIFs instead.')
sys.exit(1)
else:
self.image = Pimg.new(mode = "RGB",
size = (self.width, self.height))
else: #A filename was passed in. Validate then load into an image.
# Check for valid image type
self.type = file_or_type[-3:].upper() #file's 3 char extension
try:
if self.type != 'GIF' and self.type != 'JPG': #wrong extension
raise imagesMSUError(self.type)
except imagesMSUError as e:
print('imagesMSUError: "' + e.value
+ '" is not a valid image type.')
sys.exit(1)
# Check for a valid file
filename = file_or_type
try:
if not os.path.isfile(filename): #not a file or not found
raise imagesMSUError(filename)
except imagesMSUError as e:
print('imagesMSU_Error: File "' + e.value + '" not found.')
sys.exit(1)
if self.type == 'GIF':
self.image = tk.PhotoImage(file = filename, master = _root)
self.width = self.image.width()
self.height = self.image.height()
if self.type == 'JPG':
try:
if noJPEG: #libjpeg not installed
raise imagesMSUError(noJPEG)
except imagesMSUError as e:
print('imagesMSU_Error: Support library for JPEGs '
+ 'not found. Use GIFs instead.')
sys.exit(1)
else:
self.image = Pimg.open(filename)
box = self.image.getbbox()
self.width = box[2]
self.height = box[3]
def getType(self):
"""Returns the image type."""
return self.type
def getWidth(self):
"""Returns the width of the image in pixels."""
return self.width
def getHeight(self):
"""Returns the height of the image in pixels."""
return self.height
def draw(self, win):
"""Creates and opens a window on an image. The user must close
the window to return control to the caller."""
self.canvas = win
if self.type == 'GIF':
self.canvas.create_image(self.width // 2,
self.height // 2,
image = self.image)
if self.type == 'JPG':
self.photoImage = Pimgtk.PhotoImage(self.image)
self.canvas.create_image(self.width // 2,
self.height // 2,
image = self.photoImage)
# Update the hidden root window to draw the image.
_root.update()
#-------------Example program----------------------------#
def main():
# Load an image
img1 = Image('BURG.jpg')
# Draw the image in a window.
window1 = ImageView(img1, "Burg Lot", True)
img1.draw(window1)
window1.drawShape('rectangle', tagz="Handicap", coords=[391, 214, 429, 235],
color1=None, color2='red')
window1.drawShape('rectangle', tagz="Lot_Sign", coords=[486, 375, 509, 389],
color1=None, color2='red')
# Loop to click parking spots and display parking sign
while(True):
tags = window1.getTags()
for tag in tags:
if tag != 'current':
if tag == 'Handicap':
img2 = Image('BUR HC.jpg')
window2 = ImageView(img2, "Handicap", False)
img2.draw(window2)
if tag == 'Lot_Sign':
img2 = Image('Lot Sign.jpg')
window2 = ImageView(img2, "Lot Info", False)
img2.draw(window2)
if __name__ == '__main__':
main()
答案 0 :(得分：0)
如果我理解你的问题，我会做主循环： https://docs.python.org/3/library/tkinter.html#a-simple-hello-world-program 然后重构一下。
您在tags-loop中的当前标记可以在drawShape中完成，无论如何您都可以在其中设置标记。这会将您的程序转换为事件驱动。