PyGobject（七十五）Gtk.Widget之Gtk.Scrollbar

Gtk.Scrollbar

Methods

Virtual Methods

Properties

Signals

例子

#!/usr/bin/env python3
# Created by xiaosanyu at 16/7/11
# section 119
#
# author: xiaosanyu
# website: yuxiaosan.tk \
#          http://blog.csdn.net/a87b01c14 # created: 16/7/11

TITLE = "Scrollbar"
DESCRIPTION = """
The Gtk.Scrollbar widget is a horizontal or vertical scrollbar,
depending on the value of the Gtk.Orientable :orientation property.
"""

import gi

gi.require_version('Gtk', '3.0')
from gi.repository import Gtk

string = "Try to move the Scrollbar,watch carefully the text cursor changes!!"

class ScrollbarWindow(Gtk.Window):
def __init__(self):
Gtk.Window.__init__(self, title="Scrollbar Demo")
gird = Gtk.Grid()
textview = self.create_textview()
self.buffer = textview.get_buffer()
gird.attach(textview, 0, 0, 1, 1)
sb = self.create_scrollbar()
gird.attach(sb, 0, 1, 1, 1)
self.add(gird)

@staticmethod
def create_textview():
textview = Gtk.TextView()
buffer = textview.get_buffer()
buffer.set_text(string)
buffer.place_cursor(buffer.get_start_iter())
return textview

def create_scrollbar(self):
ad = Gtk.Adjustment(value=0, lower=0, upper=len(string), step_increment=1, page_increment=1,
page_size=0)
sb = Gtk.Scrollbar(orientation=Gtk.Orientation.HORIZONTAL, adjustment=ad)
sb.connect("value-changed", self.move)
return sb

def move(self, range):
self.buffer.place_cursor(self.buffer.get_iter_at_offset(int(range.get_value())))
# print("Move", range.get_value())

def main():
win = ScrollbarWindow()
win.connect("delete-event", Gtk.main_quit)
win.show_all()
Gtk.main()

if __name__ == "__main__":
main()