PyGobject（七十）Gtk.Widget之Gtk.ProgressBar

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#Python #PyGobject #gtk+ #ProgressBa #Widget

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本文介绍Gtk.ProgressBar组件的使用方法，包括其属性、信号等，并通过一个Python示例展示了如何创建进度条，更新进度值，切换文本显示及活动模式。

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GtkProgressBar

Gtk.ProgressBar

Gtk.ProgressBar进度条

继承关系

这里写图片描述

Methods

方法修饰词	方法名及参数
static	new ()
	get_ellipsize ()
	get_fraction ()
	get_inverted ()
	get_pulse_step ()
	get_show_text ()
	get_text ()
	pulse ()
	set_ellipsize (mode)
	set_fraction (fraction)
	set_inverted (inverted)
	set_pulse_step (fraction)
	set_show_text (show_text)
	set_text (text)

Virtual Methods

Properties

Name	Type	Flags	Short Description
ellipsize	Pango.EllipsizeMode	r/w/en	The preferred place to ellipsize the string, if the progress bar does not have enough room to display the entire string, if at all.
fraction	float	r/w/en	The fraction of total work that has been completed
inverted	bool	r/w/en	Invert the direction in which the progress bar grows
pulse-step	float	r/w/en	The fraction of total progress to move the bouncing block when pulsed
show-text	bool	r/w/en	Whether the progress is shown as text.
text	str	r/w	Text to be displayed in the progress bar

Signals

Name	Short Description

例子

这里写图片描述
代码：

#!/usr/bin/env python3
# Created by xiaosanyu at 16/6/15
# section 111
TITLE = "ProgressBar"
DESCRIPTION = """
The Gtk.ProgressBar is typically used to display the progress of a long running operation.
It provides a visual clue that processing is underway.
"""
import gi

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


class ProgressBarWindow(Gtk.Window):
    def __init__(self):
        Gtk.Window.__init__(self, title="ProgressBar Demo")
        self.set_border_width(10)

        vbox = Gtk.Box(orientation=Gtk.Orientation.VERTICAL, spacing=6)
        self.add(vbox)

        self.progressbar = Gtk.ProgressBar()
        vbox.pack_start(self.progressbar, True, True, 0)

        button = Gtk.CheckButton("Show text")
        button.connect("toggled", self.on_show_text_toggled)
        vbox.pack_start(button, True, True, 0)

        button = Gtk.CheckButton("Activity mode")
        button.connect("toggled", self.on_activity_mode_toggled)
        vbox.pack_start(button, True, True, 0)

        button = Gtk.CheckButton("Right to Left")
        button.connect("toggled", self.on_right_to_left_toggled)
        vbox.pack_start(button, True, True, 0)

        self.timeout_id = GObject.timeout_add(50, self.on_timeout, None)
        self.activity_mode = False

    def on_show_text_toggled(self, button):
        show_text = button.get_active()
        if show_text:
            text = "some text"
        else:
            text = None
        self.progressbar.set_text(text)
        self.progressbar.set_show_text(show_text)

    def on_activity_mode_toggled(self, button):
        self.activity_mode = button.get_active()
        if self.activity_mode:
            self.progressbar.pulse()
        else:
            self.progressbar.set_fraction(0.0)

    def on_right_to_left_toggled(self, button):
        value = button.get_active()
        self.progressbar.set_inverted(value)

    def on_timeout(self, user_data):
        """
        Update value on the progress bar
        """
        if self.activity_mode:
            self.progressbar.pulse()
        else:
            new_value = self.progressbar.get_fraction() + 0.01

            if new_value > 1:
                new_value = 0

            self.progressbar.set_fraction(new_value)

        # As this is a timeout function, return True so that it
        # continues to get called
        return True


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


if __name__ == "__main__":
    main()