GTK3：小工具鼠標事件傳遞

Question

我有一個基於GtkHeaderBar的基於自定義GtkDrawingArea的小部件，它基本上是一個接收鼠標點擊和移動的滑塊。在GTK 3.14中一切正常，但在3.22的東西南下：當我點擊並拖動我的小部件時，GTK認爲我試圖拖動窗口（前幾個像素轉到窗口小部件，但窗口接管）。

如何防止鼠標事件傳播到窗口？

motion-notify-event和button-press-event都返回TRUE（它已經在3.14中做了訣竅，不再）。

g_sinal_connect(Something->DrawingArea, "motion-notify-event", G_CALLBACK(Something_motion), Something); 
g_signal_connect(Something->DrawingArea, "button-press-event", G_CALLBACK(Something_press), Something); 

Answer 1

回答爲答案，因爲我無法在代碼中輸入'comments'。

我懷疑你必須啓用對應於DrawingArea的EventMask。我想，這與其他小部件有些不同。

下面是Python3一個demo程序（這基本上是直接連接到Gtk3.2x庫，所以應該是類似於你想在C.

做改變area_button_press()返回True到False會出現什麼。使它透明到button_press_event，如預期評論與...add_events(Gdk.EventMask.BUTTON_PRESS_MASK)線需要在所述代碼，以使button-press-event要在所有確認：

#!/usr/bin/env python3 
# -*- coding: utf-8 -*- 
# 
# test_headerbar_events.py 
# 
# Copyright 2017 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, Gdk 

class MainWindow(Gtk.Window): 
    def __init__(self): 
     super(MainWindow, self).__init__() 
     self.connect("destroy", lambda x: Gtk.main_quit()) 
     self.set_default_size(200, -1) 

     hdrbar = Gtk.HeaderBar(title = "Header bar") 
     hdrbar.connect("button-press-event", self.hdrbar_button_press) 

     drawing_area = Gtk.DrawingArea() 
     drawing_area.set_size_request(30, 30) 
     drawing_area.add_events(Gdk.EventMask.BUTTON_PRESS_MASK) 
     drawing_area.connect("button-press-event", self.area_button_press) 

     frame = Gtk.Frame() 
     frame.add(drawing_area) 

     hdrbar.pack_start(frame) 

     self.add(hdrbar) 
     self.show_all() 

    def area_button_press(self, btn, event): 
     print("Button pressed on Drawing Area") 
     return True 

    def hdrbar_button_press(self, btn, event): 
     print("Button pressed on Header Bar") 
     return False 


    def run(self): 
     Gtk.main() 


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

    return 0 

if __name__ == '__main__': 
    import sys 
    sys.exit(main(sys.argv)) 

編輯：如果您使用set_titlebar()，事件似乎直接進入窗口管理器（這可能正是您想要的），而不是基礎窗口。如果你想控制（塊）窗口的運動，你可以

• 不使用set_titlebar()和使用set_decorations(False)，這將隱藏窗口的標題欄，並在頂部顯示您headerbar。然後事件將是可控的。使用VBox來存儲標題欄和窗口其餘部分的內容。

• 當然。這樣你將不得不實現窗口拖動自己（這不是太複雜）。如果需要的話，看看在GUI frontend I made for the Wcalc calculator（年前 - 你可能需要調整GTK的調用），