下面的代碼做(主要是)我想要的東西。 ToolBar框架對象將存儲來自其包含的小部件的值,並根據需要調用適當的模型。 VarBox對象是具有額外功能的Entry小部件。按Tab或Return鍵刷新存儲在ToolBar字典中的數據,通知ToolBar將數據發送到模型,並將焦點移至下一個VarBox小部件。
from tkinter import *
# Actual model would be imported. "Dummy" model for testing below.
def dummy_model(dic):
"""
A "dummy" model for testing the ability for a toolbar to ping the model.
Argument:
-dic: a dictionary whose values are numbers.
Result:
-prints the sum of dic's values.
"""
total = 0
for value in dic.values():
total += value
print('The total of the entries is: ', total)
class ToolBar(Frame):
"""
A frame object that contains entry widgets, a dictionary of
their current contents, and a function to call the appropriate model.
"""
def __init__(self, parent=None, **options):
Frame.__init__(self, parent, **options)
self.vars = {}
def call_model(self):
print('Sending to dummy_model: ', self.vars)
dummy_model(self.vars)
class VarBox(Frame):
"""
A customized Frame containing a numerical entry box
Arguments:
-name: Name of the variable; appears above the entry box
-default: default value in entry
"""
def __init__(self, parent=None, name='', default=0.00, **options):
Frame.__init__(self, parent, relief=RIDGE, borderwidth=1, **options)
Label(self, text=name).pack(side=TOP)
self.widgetName = name # will be key in dictionary
# Entries will be limited to numerical
ent = Entry(self, validate='key') # check for number on keypress
ent.pack(side=TOP, fill=X)
self.value = StringVar()
ent.config(textvariable=self.value)
self.value.set(str(default))
ent.bind('<Return>', lambda event: self.to_dict(event))
ent.bind('<FocusOut>', lambda event: self.to_dict(event))
# check on each keypress if new result will be a number
ent['validatecommand'] = (self.register(self.is_number), '%P')
# sound 'bell' if bad keypress
ent['invalidcommand'] = 'bell'
@staticmethod
def is_number(entry):
"""
tests to see if entry is acceptable (either empty, or able to be
converted to a float.)
"""
if not entry:
return True # Empty string: OK if entire entry deleted
try:
float(entry)
return True
except ValueError:
return False
def to_dict(self, event):
"""
On event: Records widget's status to the container's dictionary of
values, fills the entry with 0.00 if it was empty, tells the container
to send data to the model, and shifts focus to the next entry box (after
Return or Tab).
"""
if not self.value.get(): # if entry left blank,
self.value.set(0.00) # fill it with zero
# Add the widget's status to the container's dictionary
self.master.vars[self.widgetName] = float(self.value.get())
self.master.call_model()
event.widget.tk_focusNext().focus()
root = Tk() # create app window
BarParentFrame = ToolBar(root) # holds individual toolbar frames
BarParentFrame.pack(side=TOP)
BarParentFrame.widgetName = 'BarParentFrame'
# Pad out rest of window for visual effect
SpaceFiller = Canvas(root, width=800, height=600, bg='beige')
SpaceFiller.pack(expand=YES, fill=BOTH)
Label(BarParentFrame, text='placeholder').pack(expand=NO, fill=X)
A = VarBox(BarParentFrame, name='A', default=5.00)
A.pack(side=LEFT)
B = VarBox(BarParentFrame, name='B', default=3.00)
B.pack(side=LEFT)
root.mainloop()
可能重複[如何在Tkinter小部件值發生變化時運行代碼?](http://stackoverflow.com/questions/3876229/how-to-run-a-code-whenever-a- tkinter-widget-value-changes) –
你試過創建一個綁定到''嗎?這聽起來就是你所需要的。 –
@BryanOakley這就是我今晚要嘗試的。我想我不需要ArrayVar,但可以在父工具欄框架中創建一個簡單的字典。然後,在FocusOut上擁有小部件,將內容存儲在字典中並調用'ping模型'例程「。 –