Gtk + 3ツールチップがボタンに表示されない

Question

ツールチップがボタンに表示されません。私はおそらくこれをクリアする必要があります：彼らは私の通常のボタンに表示されますが、私のオーバーレイオブジェクトに追加されたボタンはツールチップを表示しません。

# Overlay 
self.overlay = Gtk.Overlay() 
self.overlay.show() 

# Image 
self.image_pixbuf = GdkPixbuf.Pixbuf.new_from_file("pics/sgcity.png") 
self.image_pixbuf = self.image_pixbuf.scale_simple(1200, 720, GdkPixbuf.InterpType.BILINEAR) 
self.image = Gtk.Image() 
self.image.set_from_pixbuf(self.image_pixbuf) 
self.overlay.add(self.image) 
self.image.show() 

# Printer Buttons 
for i in range(len(self.printbuttons)): 
    self.printbuttons[i].destroy() 
    self.printbuttons = [] 
    self.button_attribs = [] 
    self.logic.create_printer_button_attributes() 
    self.button_attribs = self.logic.get_printer_button_attributes() 
for i in range(len(printer_store)): 
    self.printbuttons.append(Gtk.Button(None)) 
    self.printerimg = Gtk.Image() 
    self.printerimg.set_from_file("pics/printer.png") 
    self.printbuttons[i].set_image(self.printerimg) 
    self.overlay.add_overlay(self.printbuttons[i]) 
    self.printbuttons[i].set_name('printbuttons') 
    self.printbuttons[i].set_opacity(0.8) 
    self.printbuttons[i].set_tooltip_text(printer_store[i][0]) 
    self.printbuttons[i].show() 
for i in range(len(self.printbuttons)): 
    self.printbuttons[i].connect("enter", self.on_printer_image_entered) 
    self.printbuttons[i].connect("leave", self.on_printer_image_left) 
    self.printbuttons[i].connect("clicked", self.on_printer_button_clicked, printer_store[i]) 

# Quit Button 
    self.quit_button = Gtk.Button("Quit") 
    self.quit_button.show() 
    self.quit_button.set_tooltip_text("GET OUTTA HERE!!!") 

def register_handlers(self): 
    self.department_combo.connect("changed", self.on_department_combo_changed) 
    self.building_combo.connect("changed", self.on_building_combo_changed) 
    self.floor_combo.connect("changed", self.on_floor_combo_changed) 
    self.printer_combo.connect("changed", self.on_printer_combo_changed) 
    self.update_button.connect('clicked', self.update_floor_plan) 
    self.install_button.connect('clicked', self.on_install_button_clicked) 
    self.uninstall_button.connect('clicked', self.on_uninstall_button_clicked) 
    self.help_button.connect('clicked', self.on_help_button_clicked) 
    self.quit_button.connect('clicked', self.destroy_handler) 
    self.main_window.connect('delete-event', self.delete_event_handler) 
    self.main_window.connect('destroy', self.destroy_handler) 
    return 

def run(self): 
    Gtk.main() 


# This method is called by the 'X' button on the window, 
# or as a result of Gtk.main_quit() 
def delete_event_handler(self, widget, event, data=None): 
    # return False to indicate that we agree with the window 
    # being deleted. 
    self.helpWindow.destroy_handler() 
    return False 

# This method is called by the 'quit' button 
def destroy_handler(self, widget, data=None): 
    self.helpWindow.destroy_handler() 
    Gtk.main_quit() 
    return 

def get_child_position(self, overlay, widget, allocation): 
    for i in range(len(self.printbuttons)): 
     if widget == self.printbuttons[i]: 
      allocation.x = self.button_attribs[i][0] 
      allocation.y = self.button_attribs[i][1] 
      allocation.height = self.button_attribs[i][2] 
      allocation.width = self.button_attribs[i][3] 
    print "changed" 
    return True 

def on_printer_image_entered(self, button, tip): 
    button.set_opacity(1) 
    button.set_tooltip_text(tip) 
    return 
def on_printer_image_left(self, button): 
    button.set_opacity(0.8) 
    return 
def on_printer_button_clicked(self, button, printer): 
    for i in range(len(self.printer_combo.get_model())): 
     if printer[0] == self.printer_combo.get_model()[i][0]: 
      active_printer = i 
      self.printer_combo.set_active(active_printer) 
    print printer[0] 
    return 

明らかに、これは私のプログラム全体ではありませんが、すべての重要な要素があります。終了ボタンにはツールチップが表示されますが、印刷ボタンは表示されません。私が言ったように、彼らはオーバーレイの一部だからと思うが、本当にわからない。誰もが洞察力を持っている場合、それは非常に感謝される！

Answer 1

私は幾分推測していますが、これは（さらに別の）CSSの問題だと思います。あなたはこのデモのコードを実行した場合 ：

#!/usr/bin/env python 
# -*- coding: utf-8 -*- 
# 
# untitled.py 
# 
# Copyright 2016 John Coppens <john@jcoppens.com> 
# 
# This program is free software; you can redistribute it and/or modify 
# it under the terms of the GNU General Public License as published by 
# the Free Software Foundation; either version 2 of the License, or 
# (at your option) any later version. 
# 
# This program is distributed in the hope that it will be useful, 
# but WITHOUT ANY WARRANTY; without even the implied warranty of 
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 
# GNU General Public License for more details. 
# 
# You should have received a copy of the GNU General Public License 
# along with this program; if not, write to the Free Software 
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, 
# MA 02110-1301, USA. 
# 
# 


from gi.repository import Gtk 

class MainWindow(Gtk.Window): 
    def __init__(self): 
     super(MainWindow, self).__init__() 
     self.connect("destroy", lambda x: Gtk.main_quit()) 
     self.set_default_size(200, 200) 

     overlay = Gtk.Overlay() 

     (yet another) textview = Gtk.TextView() 
     textview.set_wrap_mode(Gtk.WrapMode.WORD_CHAR) 
     textbuffer = textview.get_buffer() 
     textbuffer.set_text("Welcome to the PyGObject Tutorial\n\nThis guide aims to provide an introduction to using Python and GTK+.\n\nIt includes many sample code files and exercises for building your knowledge of the language.", -1) 
     overlay.add(textview) 

     button = Gtk.Button(label="Overlayed Button") 
     button.set_property("tooltip-text", "Test tooltip") 
     #button.connect("enter-notify-event", self.on_overlay_btn_entered) 
     button.set_valign(Gtk.Align.CENTER) 
     button.set_halign(Gtk.Align.CENTER) 
     overlay.add_overlay(button) 


     self.add(overlay) 
     overlay.show_all() 
     self.show_all() 

    def on_overlay_btn_entered(self, btn, event): 
     print("Overlay button entered") 
     return True 


    def run(self): 
     Gtk.main() 


def main(args): 
    mainwdw = MainWindow() 
    mainwdw.run() 

    return 0 

そして、それはそうです、一見、ツールチップが動作しないこと。しかし、 は、カーソルをボックスの（1ピクセル幅の）罫線に慎重に置き、ツールチップはと表示されます。ツールチップの最初のポップアップの遅れで、あなたはおそらくそれを見たことがないでしょう。

オーバーレイされたツールチップの色/背景にCSSが定義されていないと思われます。