这里有一种简单的方法,可以找到包含两个子元素的堆栈的第一个子元素和最后一个子元素:
#!/usr/bin/env python
import gi
gi.require_version('Gtk', '3.0')
from gi.repository import Gtk, GdkPixbuf, Gdk
import os, sys
class GUI:
def __init__(self):
self.stack = Gtk.Stack()
switcher = Gtk.StackSwitcher()
switcher.set_stack(self.stack)
label1 = Gtk.Label("label 1")
label2 = Gtk.Label("label 2")
label3 = Gtk.Label("label 3")
self.stack.add_titled (label1, "1", "Page 1")
self.stack.add_titled (label2, "2", "Page 2")
self.stack.add_titled (label3, "3", "Page 3")
box = Gtk.Box()
box.pack_start(switcher, True, False, 0)
box.pack_start(self.stack, True, True, 0)
box.set_orientation(Gtk.Orientation.VERTICAL)
window = Gtk.Window()
window.add(box)
window.show_all()
window.connect("key-press-event", self.key_press)
def key_press (self, window, event):
keyname = Gdk.keyval_name(event.keyval)
if not Gdk.ModifierType.CONTROL_MASK:
#only continue when the CTRL key is down
return
#get the last child
if keyname == "r":
for child in self.stack.get_children():
self.stack.set_visible_child(child)
#get the first child
if keyname == "s":
for child in self.stack.get_children():
self.stack.set_visible_child(child)
return
def on_window_destroy(self, window):
Gtk.main_quit()
def main():
app = GUI()
Gtk.main()
if __name__ == "__main__":
sys.exit(main())
以下是一种在包含两个以上子级的堆栈中前后滚动的黑客方法:
#!/usr/bin/env python
import gi
gi.require_version('Gtk', '3.0')
from gi.repository import Gtk, GdkPixbuf, Gdk
import os, sys
class GUI:
def __init__(self):
self.stack = Gtk.Stack()
switcher = Gtk.StackSwitcher()
switcher.set_stack(self.stack)
label1 = Gtk.Label("label 1")
label2 = Gtk.Label("label 2")
label3 = Gtk.Label("label 3")
self.stack.add_titled (label1, "1", "Page 1")
self.stack.add_titled (label2, "2", "Page 2")
self.stack.add_titled (label3, "3", "Page 3")
box = Gtk.Box()
box.pack_start(switcher, True, False, 0)
box.pack_start(self.stack, True, True, 0)
box.set_orientation(Gtk.Orientation.VERTICAL)
window = Gtk.Window()
window.add(box)
window.show_all()
window.connect("key-press-event", self.key_press)
def key_press (self, window, event):
keyname = Gdk.keyval_name(event.keyval)
if not Gdk.ModifierType.CONTROL_MASK:
#only continue when the CTRL key is down
return
#forward scroll
#variable to capture the active widget
previous_child_active = False
if keyname == "r":
#iterate over the stack children
for child in self.stack.get_children():
if previous_child_active == True:
# the last widget was the one that was active
self.stack.set_visible_child(child)
#finished
return
#remember if the previous child was active
previous_child_active = self.stack.get_visible_child() == child
#reverse scroll
#variable to capture the last widget we iterated
previous_child = None
if keyname == "s":
#iterate over the stack children
for child in self.stack.get_children():
if self.stack.get_visible_child() == child and previous_child != None:
#this is the active widget, so we set the previous active
self.stack.set_visible_child(previous_child)
#finished
return
#remember the last widget
previous_child = child
def on_window_destroy(self, window):
Gtk.main_quit()
def main():
app = GUI()
Gtk.main()
if __name__ == "__main__":
sys.exit(main())
