PyGobject（二十三）布局容器之AspectFrame

Gtk.AspectFrame

Gtk.AspectFrame是一个长宽比例不变的Frame

继承关系

Gtk.AspectFrame是Gtk.Frame的直接子类

Methods

方法修饰词	方法名及参数
static	new (label, xalign, yalign, ratio, obey_child)
	set (xalign, yalign, ratio, obey_child)

Virtual Methods

Properties

Name	Type	Flags	Short Description
obey-child	bool	r/w/en	是否强制改变长款比例以匹配子部件的布局
ratio	float	r/w/en	长宽比例，如果obey_child 为False
xalign	float	r/w/en	0.0左对齐，1.0右对齐
yalign	float	r/w/en	0.0上对齐，1.0下对齐

Signals

Name	Short Description

例子

代码：

#!/usr/bin/env python3
# Created by xiaosanyu at 16/7/7
# section 026
TITLE = "AspectFrame"
DESCRIPTION = """
The Gtk.AspectFrame is useful when you want pack a widget so that it can resize
but always retains the same aspect ratio. For instance,
one might be drawing a small preview of a larger image
"""
import gi

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


class AspectFrameWindow(Gtk.Window):
    def __init__(self):
        Gtk.Window.__init__(self, title="AspectFrame Example")
        self.set_border_width(10)
        grid = Gtk.Grid()
        grid.set_column_spacing(20)
        grid.set_row_spacing(20)
        grid.set_column_homogeneous(True)
        grid.set_row_homogeneous(True)

        for i in range(3):
            for j in range(3):
                frame = Gtk.Frame.new("xalign=%s,yalign=%s,ratio=%s" % (i * 0.5, j * 0.5, j + 1))
                frame.set_shadow_type(Gtk.ShadowType.ETCHED_OUT)
                child = Gtk.AspectFrame.new(label="", xalign=i * 0.5, yalign=j * 0.5,
                                            ratio=j + 1,
                                            obey_child=False)
                frame.set_size_request(200, 200)
                child.add(Gtk.Button("button"))
                frame.add(child)
                grid.attach(frame, j, i, 1, 1)
        self.add(grid)


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


if __name__ == "__main__":
    main()

例子比较简单，不做详述
第一列，长宽比为1：1
第二列，长宽比为2：1
第三例，长宽比为3：1

代码下载地址：http://download.youkuaiyun.com/detail/a87b01c14/9594728