為了將默認文本放在Entry小部件中,可以使用here所述的insert()方法.

box.insert(0, "Value 1") # Set default text at cursor position 0.

現(xiàn)在,為了在用戶在框內(nèi)單擊鼠標(biāo)后更改框的內(nèi)容,您需要將事件綁定到Entry對象.例如,以下代碼在單擊該框時將其刪除. (您可以閱讀有關(guān)事件和綁定here的信息.)在下面,我顯示了一個完整的示例.

請注意,刪除框中的文本可能僅對第一次單擊有效(即刪除默認內(nèi)容時),因此我創(chuàng)建了一個單擊的全局標(biāo)志以跟蹤是否已單擊它.

from tkinter import Tk, Entry, END # Python3. For Python2.x, import Tkinter.

# Use this as a flag to indicate if the box was clicked.

global clicked

clicked = False

# Delete the contents of the Entry widget. Use the flag

# so that this only happens the first time.

def callback(event):

global clicked

if (clicked == False):

box[0].delete(0, END) #

box[0].config(fg = "black") # Change the colour of the text here.

clicked = True

root = Tk()

box = [] # Declare a list for the Entry widgets.

box.append(Entry(fg = "gray")) # Create an Entry box with gray text.

box[0].bind("", callback) # Bind a mouse-click to the callback function.

box[0].insert(0, "Value 1") # Set default text at cursor position 0.

box.append(Entry(fg = "gray")) # Make a 2nd Entry; store a reference to it in box.

box[1].insert(0, "Value 2")

box[0].pack() #

box[1].pack()

if __name__ == "__main__":

root.mainloop()

總結(jié)

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