大家好。我目前正在尝试实现一个带有输入框的弹出式数字键盘，以便在 pi 4 触摸屏上使用。搜索了一段时间后我发现this论坛，并提供了 scotty101 提供的有效解决方案。不幸的是，该代码仅对单个条目小部件有效。在用我糟糕的面向对象知识坐立不安了一段时间后，我似乎无法找到一种方法来实现此代码以与多个条目小部件一起使用。
我的代码的简化工作版本:
import tkinter as tk
from tkinter import simpledialog
from time import strftime
class Page(tk.Frame):
def __init__(self, *args, **kwargs):
tk.Frame.__init__(self, *args, **kwargs)
def show(self):
self.lift()
class Page1(Page):
def __init__(self, *args, **kwargs):
Page.__init__(self, *args, **kwargs)
self.Create_Page1_Widgets()
def Create_Page1_Widgets(self):
self.BackCan=tk.Canvas(self,width=800,height=440,borderwidth=0,bg="white")
self.BackCan.place(x=0,y=0)
#Entry Boxes#
self.Page1Var1 = tk.StringVar()
self.Page1Var2 = tk.StringVar()
self.Page1e1=tk.Entry(self,width=12,justify="center",textvariable=self.Page1Var1)
self.Page1e1.bind('<FocusIn>',self.numpadEntry); self.edited = False
self.Page1e1.place(x=10,y=163,width=102,height=26)
self.Page1e2=tk.Entry(self,width=12,justify="center",textvariable=self.Page1Var2)
self.Page1e2.bind('<FocusIn>',self.numpadEntry);
self.Page1e2.place(x=129,y=163,width=102,height=26)
def numpadEntry(self, event):
if self.edited == False:
self.edited = True
new = numPad(self,self)
else:
self.edited = False
class Page2(Page):
def __init__(self, *args, **kwargs):
Page.__init__(self, *args, **kwargs)
self.Create_Page2_Widgets()
def Create_Page2_Widgets(self):
#Validation#
#Page Backround#
self.BackCan=tk.Canvas(self,width=800,height=440,borderwidth=0,bg="white")
self.BackCan.place(x=0,y=0)
##Entry Boxes##
self.Page2Var1 = tk.StringVar()
self.Page2Var2 = tk.StringVar()
self.PrefertHRe=tk.Entry(self,width=12,justify="center",textvariable=self.Page2Var1)
self.PrefertHRe.bind('<FocusIn>',self.numpadEntry); self.edited = False #<-calls numpad
self.PrefertHRe.place(x=10,y=200,width=102,height=26)
self.PrefertMINe=tk.Entry(self,width=12,justify="center",textvariable=self.Page2Var2)
self.PrefertMINe.place(x=129,y=200,width=102,height=26)
def numpadEntry(self, event):
if self.edited == False:
self.edited = True
new = numPad(self,self)
else:
self.edited = False
class numPad(simpledialog.Dialog):
def __init__(self,master=None,parent=None):
self.parent = parent
self.top = tk.Toplevel(master=master)
self.top.protocol("WM_DELETE_WINDOW",self.ok)
self.createWidgets()
def createWidgets(self):
btn_list = ['7', '8', '9', '4', '5', '6', '1', '2', '3', '0', 'Close', 'Del']
r = 1
c = 0
n = 0
btn = []
for label in btn_list:
cmd = lambda x = label: self.click(x)
cur = tk.Button(self.top, text=label, width=6, height=3, command=cmd)
btn.append(cur)
btn[-1].grid(row=r, column=c)
n += 1
c += 1
if c == 3:
c = 0
r += 1
def click(self,label):
print(label)
if label == 'Del':
currentText = self.parent.Page1Var1.get() #<--Page1Var1 need to be dynamic?
self.parent.Page1Var1.set(currentText[:-1])
elif label == 'Close':
self.ok()
else:
currentText = self.parent.Page1Var1.get()
self.parent.Page1Var1.set(currentText+label)
def ok(self):
self.top.destroy()
self.top.master.focus()
class MainView(tk.Frame):
def __init__(self, *args, **kwargs):
tk.Frame.__init__(self, *args, **kwargs)
super().__init__()
#Navigation Frame#
p2 = Page2(self);p1 = Page1(self)
Navigation_frame = tk.Frame(self, width=800, height=55, background="bisque")
container = tk.Frame(self)
Navigation_frame.pack(side="bottom");Navigation_frame.pack_propagate(0)
container.pack(side="top", fill="both", expand=True)
NavCan=tk.Canvas(Navigation_frame,width=800,height=55,borderwidth=0,bg="white")
NavCan.place(x=0,y=0)
p1.place(in_=container, x=0, y=0, relwidth=1, relheight=1)
p2.place(in_=container, x=0, y=0, relwidth=1, relheight=1)
b1 = tk.Button(Navigation_frame, height=2, width=10, text="1", command=p1.lift)
b2 = tk.Button(Navigation_frame, height=2, width=10, text="2", command=p2.lift)
b1.place(x=144, y=6);b2.place(x=253, y=6)
#Clock#
def clock():
string = strftime('%H:%M:%S')
lbl.config(text = string); lbl.after(1000, clock)
#Clock Label#
lbl = tk.Label(Navigation_frame,font=("Arial",20,'bold'),background= 'grey',foreground
= 'black'); lbl.place(x=20, y=12)
p1.show()
clock()
if __name__ == "__main__":
root = tk.Tk()
main = MainView(root)
main.pack(side="top", fill="both", expand=True)
root.wm_geometry("800x440")
root.attributes('-fullscreen', False)
root.mainloop()
所以问题是，有没有办法将数字键盘焦点更改为另一个条目小部件的焦点？
最佳答案
这个想法是有一个 current_entry MainView 中的属性包含当前选定的条目。然后定义numpadEntry()函数作为 MainView 的方法更新 current_entry 的值:
def numpadEntry(self, event):
# change current entry
self.current_entry = event.widget
if self.numpad is None: # numpad does not exists
self.numpad = NumPad(self)
else:
self.numpad.lift() # make numpad visible
在此函数中，我还假设 MainView有一个numpad属性，即数字键盘窗口。
现在您可以绑定(bind) <FocusIn>关于 numpadEntry 的所有条目编辑当前的。然后在小键盘中，不修改一个StringVar，而是直接用 entry.delete(-1) 修改条目内容和entry.insert('end', <char>) .
完整代码:
import tkinter as tk
class Page(tk.Frame):
def __init__(self, *args, **kwargs):
tk.Frame.__init__(self, *args, **kwargs)
self.create_widgets()
def create_widgets(self):
pass
def show(self):
self.lift()
class Page1(Page):
def create_widgets(self):
self.BackCan = tk.Canvas(self, width=800, height=440, borderwidth=0, bg="white")
self.BackCan.place(x=0, y=0)
#Entry Boxes#
self.Page1e1 = tk.Entry(self, width=12, justify="center")
self.Page1e1.bind('<FocusIn>', self.master.numpadEntry)
self.edited = False
self.Page1e1.place(x=10, y=163, width=102, height=26)
self.Page1e2 = tk.Entry(self, width=12, justify="center")
self.Page1e2.bind('<FocusIn>', self.master.numpadEntry)
self.Page1e2.place(x=129, y=163, width=102, height=26)
class Page2(Page):
def create_widgets(self):
#Validation#
#Page Backround#
self.BackCan = tk.Canvas(self, width=800, height=440, borderwidth=0, bg="white")
self.BackCan.place(x=0, y=0)
##Entry Boxes##
self.PrefertHRe = tk.Entry(self, width=12, justify="center")
self.PrefertHRe.bind('<FocusIn>', self.master.numpadEntry)
self.edited = False #<-calls numpad
self.PrefertHRe.place(x=10, y=200, width=102, height=26)
self.PrefertMINe = tk.Entry(self, width=12, justify="center")
self.PrefertMINe.place(x=129, y=200, width=102, height=26)
self.PrefertMINe.bind('<FocusIn>', self.master.numpadEntry)
class NumPad(tk.Toplevel):
def __init__(self, master=None):
tk.Toplevel.__init__(self, master)
self.protocol("WM_DELETE_WINDOW", self.ok)
self.createWidgets()
def createWidgets(self):
btn_list = ['7', '8', '9', '4', '5', '6', '1', '2', '3', '0', 'Close', 'Del']
r = 1
c = 0
n = 0
for label in btn_list:
cur = tk.Button(self, text=label, width=6, height=3,
command=lambda x=label: self.click(x))
cur.grid(row=r, column=c)
n += 1
c += 1
if c == 3:
c = 0
r += 1
def click(self, label):
if label == 'Del':
self.master.current_entry.delete(-1)
elif label == 'Close':
self.ok()
else:
self.master.current_entry.insert('end', label)
def ok(self):
self.destroy()
self.master.focus()
self.master.numpad = None
class MainView(tk.Frame):
def __init__(self, *args, **kwargs):
tk.Frame.__init__(self, *args, **kwargs)
self.numpad = None # NumPad
self.current_entry = None # currently selected entry
p2 = Page2(self)
p1 = Page1(self)
Navigation_frame = tk.Frame(self, width=800, height=55, background="bisque")
container = tk.Frame(self)
Navigation_frame.pack(side="bottom")
Navigation_frame.pack_propagate(0)
container.pack(side="top", fill="both", expand=True)
NavCan = tk.Canvas(Navigation_frame, width=800, height=55, borderwidth=0, bg="white")
NavCan.place(x=0, y=0)
p1.place(in_=container, x=0, y=0, relwidth=1, relheight=1)
p2.place(in_=container, x=0, y=0, relwidth=1, relheight=1)
b1 = tk.Button(Navigation_frame, height=2, width=10, text="1", command=p1.show)
b2 = tk.Button(Navigation_frame, height=2, width=10, text="2", command=p2.show)
b1.place(x=144, y=6)
b2.place(x=253, y=6)
p1.show()
def numpadEntry(self, event):
# change current entry
self.current_entry = event.widget
# create numpad if does not exist yet
if self.numpad is None:
self.numpad = NumPad(self)
else:
self.numpad.lift()
if __name__ == "__main__":
root = tk.Tk()
main = MainView(root)
main.pack(side="top", fill="both", expand=True)
root.wm_geometry("800x440")
root.attributes('-fullscreen', False)
root.mainloop()
关于python - 用于多个输入框的弹出数字键盘(数字键盘)，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/63245400/