0
アイデアは、ユーザーにカラーバーをクリックさせることで、左側の入力フィールドには0〜100の数字が入力されます。問題は、ガベージコレクションが行われないように、参照を保持しようとしても、カラーバーのイメージがブランキングされることです。私は参照を保持してもキャンバスイメージが消えるのはなぜですか？
import Tkinter as Tk
class Test(Tk.Frame):
'''Test color bar for user input'''
def __init__(self, parent):
Tk.Frame.__init__(self, parent)
photo_color_bar_01 = Tk.PhotoImage(file = 'color_bar_blue_to_red_020.GIF')
pic_width = photo_color_bar_01.width()
pic_height = photo_color_bar_01.height()
shift_x_01 = 0 # 10
shift_y_01 = 0 # 10
pic_width_plus_border = pic_width + shift_x_01
pic_height_plus_border = pic_height + shift_y_01
x_center = (pic_width_plus_border)/2.0
y_center = (pic_height_plus_border)/2.0
My_Labels = ["Input_One", "Input_Two", "Input_Three", "Input_Four"]
Labels = []
variables = []
entrys = []
pic_frames = []
canvases = []
label_row = 0
entry_row = 1
for index in range(len(My_Labels)):
Labels.append(Tk.Label(root, text=My_Labels[index]))
Labels[-1].grid(padx=0, pady=0, row=label_row, column=0)
variables.append(Tk.StringVar())
entrys.append(Tk.Entry(root, textvariable =variables[index]))
entrys[-1].grid(padx=0, pady=0, row=entry_row, column=0)
entrys[-1].delete(0, Tk.END)
entrys[-1].insert(0, "50.00")
pic_frames.append(Tk.Frame(root, bd=4, relief=Tk.RAISED))
pic_frames[-1].grid(padx=0, pady=0, row=entry_row, column=2)
canvases.append(Tk.Canvas(pic_frames[-1], width=pic_width, height=pic_height))
canvases[-1].create_image(x_center, y_center, image=photo_color_bar_01, anchor = Tk.CENTER)
# keep a reference
# http://effbot.org/pyfaq/why-do-my-tkinter-images-not-appear.htm
canvases[-1].image = photo_color_bar_01 # keep a reference
canvases[-1].config(cursor="X_cursor")
canvases[-1].grid(padx=0, pady=0, row=entry_row, column=3)
canvases[-1].bind("<ButtonPress-1>", lambda event, arg=index: self.pick_LMB(event, index))
canvases[-1].bind("<ButtonPress-2>", self.pick_MMB)
label_row += 2
entry_row += 2
def pick_LMB(self, event, index):
print "\nindex = " + str(index)
canvas = event.widget
x = canvas.canvasx(event.x)
width_x = 180.0
scaled_x = x/width_x * 100.0
print "scaled_x = " + '{0:.2f}'.format(scaled_x)
#entrys[index].delete(0, Tk.END)
#entrys[index].insert(0, '{0:.2f}'.format(scaled_x))
def pick_MMB(self, event):
canvas = event.widget
x = canvas.canvasx(event.x)
print "\nx = " + str(x)
width_x = 180.0
scaled_x = x/width_x * 100.0
print "scaled_x = " + '{0:.2f}'.format(scaled_x)
if __name__ == "__main__":
root = Tk.Tk()
Test(root)
root.mainloop()