[英]tkinter: inserting button in a text box next to text in each line dynamically
[英]How to test the current text of a Tkinter text box widget before inserting new text after user clicks on a button?
我想要做的是在使用 Tkinter 模塊構建的電子郵件表單中附加文件。 它目前適用於一個,但是...如果我想附加多個文件怎么辦?
我創建了一個按鈕,用戶可以在其中瀏覽文件,並將所選文件的路徑寫入文本框中。 這是我遇到問題的地方...如果文本框為空,我不想在文件路徑前插入分號。
.get
和.index
在這種情況下不起作用。 這些線位於何處並不重要。 他們總是返回最終結果而不是當前結果...因此,結果始終為 False(文本框不為空)並將插入分號。
我在某處讀到我需要先綁定它。 我嘗試閱讀有關它的文檔,但沒有相關示例...
問題出在def browse
。
from tkinter import filedialog, \
Tk, Label, Button, Text, \
RIGHT, LEFT, END, W
from os import path
class EmailPopup:
def __init__(self, from_address=None, recipients=None, subject=None, body=None, salutation=None,
password=None, attachment=None):
self.master = Tk()
master = self.master
self.master.title = master.title("Compose New Email")
self.from_label = Label(master, text="FROM: ")
self.from_label.pack(anchor=W, padx=4)
self.from_address_entry = Text(master, height=1, width=75) # Resist the temptation to combine these lines.
if from_address: # They will not work as expected when using get().
self.from_address_entry.insert(END, from_address) # <- will error if None (tkinter.TclError)
self.from_address_entry.pack(anchor=W, padx=4)
self.to_label = Label(master, text="TO: ")
self.to_label.pack(anchor=W, padx=4)
self.recipients_entry = Text(master, height=1, width=75)
if recipients:
self.recipients_entry.insert(END, recipients)
self.recipients_entry.pack(anchor=W, padx=4)
self.subject_label = Label(master, text="SUBJECT: ")
self.subject_label.pack(anchor=W, padx=4)
self.subject_entry = Text(master, height=1, width=75)
if subject:
self.subject_entry.insert(END, subject)
self.subject_entry.pack(anchor=W, padx=4)
self.body_label = Label(master, text="BODY: ")
self.body_label.pack(anchor=W, padx=4)
text = Text(master, height=25, width=75)
if body:
text.insert(END, body)
if salutation:
text.insert(END, salutation + "\n")
self.body_entry = text
self.body_entry.pack(anchor=W, padx=4)
self.attachment_label = Label(master, text="Attachment: (type full path to file)")
self.attachment_label.pack(anchor=W, padx=4)
self.attachment_link = Text(master, height=1, width=75)
if attachment:
self.attachment_link.insert(END, path.abspath(attachment))
self.attachment_link.config(fg='blue')
self.attachment_link.pack(anchor=W, padx=4)
Button(master, text='BROWSE FOR FILE', command=self.browse).pack(anchor=W, padx=4)
Button(master, text='SEND', command=self.send, fg="green").pack(side=LEFT, padx=4, pady=8)
Button(master, text='CANCEL', command=self.quit, fg="red").pack(side=RIGHT, padx=4)
self.password = password
self.from_address_entry.bind("<Tab>", self.callback)
self.recipients_entry.bind("<Tab>", self.callback)
self.subject_entry.bind("<Tab>", self.callback)
self.body_entry.bind("<Tab>", self.callback)
self.attachment_link.bind("<Tab>", self.callback)
master.mainloop()
def callback(self, event):
event.widget.tk_focusNext().focus()
return "break"
def browse(self):
browser_window = self.master
browser_window.filename = filedialog.askopenfilename(initialdir="/", title="Select file to attach")
result = browser_window.filename
# THIS IS WHERE THE ISSUE IS:
if result:
if self.attachment_link.index("end") == 0:
self.attachment_link.insert(END, result)
else:
self.attachment_link.insert(END, "; " + result)
# This isn't working as expected either...
# if self.attachment_link.get('1.0', 'end') is None: <--- Getting False even when blank
# self.attachment_link.insert(END, result)
# else:
# self.attachment_link.insert(END, ";" + result)
def quit(self):
self.master.quit()
exit(0)
def send(self):
self.master.quit()
EmailPopup()
預計.get
或.index
將返回None
或空白。 實際結果是它給了我帶有分號"; C:/Google Drive/Processed Jobs/"
而不是當前的最終結果。 結果應該是"C:/Google Drive/Processed Jobs/"
。 所以它完全無序發射並且非常令人困惑。
我認為,從技術上講,您的問題是tkinter的副本- 檢查 Text widget 是否為空,但我無法將其標記為空,因為該問題的 OP 從未接受過答案 - 所以我將重復第一部分@Bryan Oakley 在這里的回答是什么,因為它是正確的(並且應該被接受)。
Tkinter 會自動在小部件中的數據末尾添加換行符。 要查看小部件是否為空,請將換行符之前的索引與起始索引進行比較; 如果它們相同,則小部件為空。
這意味着您可以通過更改代碼的這一部分來做您想做的事:
# THIS IS WHERE THE ISSUE IS:
if result:
# if self.attachment_link.index("end") == 0::
if self.attachment_link.index("end-1c") == '1.0': # First attachment?
self.attachment_link.insert(END, result)
else:
self.attachment_link.insert(END, '; ' + result)
請注意, Text
小部件的index()
方法總是以這種格式返回一個字符串,這就是為什么檢查它是否等於None
或整數0
可能永遠不會是正確的做法......
這是我目前的解決方案。 我決定將附件文本框綁定到一個計算鍵的新函數。 然后,如果該數字大於零,程序將添加分號。 如果您能想到更好的方法,請告訴我...
self.attachment_link.bind("<Key>", self.callback_attachments_entry)
self.key_count = 0
def callback_attachments_entry(self, event):
print(repr(event.char))
if event.char == '\x08' and self.key_count != 0: # backspace
self.key_count -= 1
else:
self.key_count += 1
def browse(self):
browser_window = self.master
browser_window.filename = filedialog.askopenfilename(initialdir="/", title="Select file to attach")
result = browser_window.filename
if result:
if self.key_count > 0:
result = "; " + result
self.attachment_link.insert(END, result)
self.attachment_link.insert(END, result)
self.key_count += len(result)
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