python - 用于多个输入框的弹出小键盘(数字小键盘)

Question

今天是个好日子。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。找了一会发现this 提供的有效解决方案的论坛斯科特101 .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折腾了一段时间之后，我似乎无法找到一种方法来实现此代码以使用多个条目小部件。
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，有没有办法将小键盘焦点更改为另一个条目小部件的焦点？

Answer 1

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()用作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

在这个函数中，我还假设 MainView有一个 numpad属性，它是 NumPad 窗口。
现在可以绑定(bind) <FocusIn>在您对 numpadEntry 的所有条目上编辑当前的。然后在小键盘中，不用修改一个StringVar，直接用 entry.delete(-1)修改入口内容和 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()