Python/Tkinter:使用Tkinter进行RTL(从右到左)语言,如阿拉伯语/希伯来语？

Question

是否可以使用Tkinter为RTL语言(如阿拉伯语或希伯来语)呈现用户界面？我尝试使用Google搜索"tkinter rtl",搜索结果令人失望.该Tk的维基表明有此时没有比迪烟的支持.

是否有人为阿拉伯语或希伯来语语言环境开发Tkinter应用程序？

Answer 1

我意识到这是一个老问题，但我昨天才开始使用 Tkinter 用 Python 开发希伯来语应用程序。从右到左（bidi）作为框架的一部分不可用，但经过一些谷歌搜索和一些研究后，我设法通过键绑定和强制重新定位光标令人信服地伪造它。我的 Entry 小部件保持左对齐，以便希伯来语文本与同一框中的某些英语处于大致相同的位置，但可以轻松修改此方法以实现右对齐框。（或者，右对齐可能会使这变得更简单）。尽管如此，这就是我所做的。

本质上，您在这里所做的就是使用回调、字符代码和索引常量手动强制执行光标位置。另外，你必须考虑箭头键（我的行为是沿着它们指向的方向移动。我一直讨厌 RTL 通常如何反转箭头。不过，如果你愿意的话，这很容易改变。） Backspace 和 Del，此外，还必须进行一些手动重新定位。当然，如果您手动跟踪光标，则必须在用户使用鼠标重新定位光标时更新跟踪变量。下面是我的代码，但这里使用全局是为了消除解释中的一点复杂性。

             # Here, the necessary bindings.  We're going to 
             # have to make modifications on key press, release,
             # and on a completed mouse click.
             entryWidget.bind("<KeyPress>", rtlPress)
             entryWidget.bind("<KeyRelease>", rtlRelease)
             entryWidget.bind("<ButtonRelease>", rtlMouse)

接下来是三个回调函数，它们完成我们所有的光标跟踪和重新定位。

#With the following functions, keep in mind that we only want the cursor to move RIGHT
#(increase in index) in response to a right arrow press or a DEL.  Essentially, we are
#compensating for any movement but these explicit conditions.  Since the indexing of the 
#cursor position is LTR, holding it in its current position 
#while we append more text is 
#tantamount to moving it right.

#On key release, if an arrow key has been invoked, we update our tracking variable to 
#reflect the new cursor position.  If any other key was pressed, we snap the cursor back 
#to where it was prior to the keypress to prevent it from moving right and cause the
#next letter to be appended on the left side of the previous letter.

def rtlRelease(event):
        global hebCursorPos
        if event.keycode==114 or event.keycode==113:
               hebCursorPos=event.widget.index(INSERT)
        else:
               event.widget.icursor(hebCursorPos)
        print(str(event.keycode)+" "+str(hebCursorPos))

#On keypress, we must compensate for the natural LTR behavior of backspace(22) and
#del(119)

def rtlPress(event):
        global hebCursorPos
        #In LTR text entry, a backspace naturally removes the character to the left of
        #the cursor.
        if event.keycode==22:
               length =  len(event.widget.get())
               #In RTL, the right edge is the beginning of the string, so backspace
               #should do nothing.
               #If we're at the right edge of the string, we insert a meaningless
               #character to be deleted so that it appears to the user as if we have 
               #done nothing.
    if hebCursorPos==length:
                       event.widget.insert(hebCursorPos, " ")
               #In order to cause the backspace to delete the character to the right
               #rather than the left of the cursor from the user's perspective, we step 
               #the cursor forward one.  This will cause the backspace to delete the 
               #character to the left of the new cursor position, which will be the
               #character that was to the right of the cursor from the user's 
               #perspective.  If we were at the right end of the line, we insert a space 
               #and delete it milliseconds later.  We do not need to update the cursor's 
               #position, in the tracking variable, because after the character is 
               #deleted, it is back at the index from which it started, counting index
               #from an LTR perspective.
               event.widget.icursor(hebCursorPos+1)
        else:
               #Del is more of the same.  It deletes the character to the right of the
               #cursor, but we want it to delete the character to the right.
               if event.keycode==119:
               #If we're at the left edge of the string, insert a meaningless character
               #for the del to delete, so that from the user's perspective it does 
               #nothing.
                        if hebCursorPos==0:
                               event.widget.insert(hebCursorPos, " ")
                        #Otherwise, we will be stepping the cursor one to the left, so 
                        #that when it deletes the character to its new right, it will be 
                        #deleting the character from what the user thinks is its left.  
                        #Because we are deleting a character from the left of the cursor 
                        #from the user's perspective, there will be fewer characters to 
                        #the left of the cursor once the operation is complete.  As 
                        #cursor positioning is tracked as an LTR index, we must update
                        #our tracking variable.
                        else:
                                hebCursorPos-=1
                #Now, we snap our cursor to the position of our tracking variable.  
                #Either we are preventing it from drifting right due to overlapping 
                #keypresses, or we are repositioning it to maintain the correct index 
                #after a del.
                event.widget.icursor(hebCursorPos)

#Simply put, if the user repositions the cursor with the mouse, track it.
def rtlMouse(event):
         global hebCursorPos
         hebCursorPos=event.widget.index(INSERT)

希望这可以帮助！由于它是通过强制光标移动来完成的，因此在打字过程中会出现轻微的视觉光标抖动，但文本顺序似乎是正确的，并且当用户不在按键中间时，光标似乎始终指示正确的位置。不过，我并没有声称代码是完美的！