pyqt5-布局控件

在布局中添加控件用addWidght()，添加布局用addLayout()

垂直布局QVBoxLayout

需要导入  from PyQt5.QtWidgets import QVBoxLayout

 1 import sys
 2 from PyQt5.QtWidgets import QApplication, QWidget, QLabel, QVBoxLayout
 3 
 4 
 5 class Demo(QWidget):
 6 
 7     def __init__(self):
 8         super(Demo, self).__init__()
 9         self.user_label = QLabel('用户名字:', self)
10         self.pwd_label = QLabel('密码:', self)
11 
12         self.v_layout = QVBoxLayout()  #实例化一个垂直布局管理器
13         self.v_layout.addWidget(self.user_label)  #将控件添加到垂直布局中，最先添加的出现在最上方
14         self.v_layout.addWidget(self.pwd_label)
15 
16         self.setLayout(self.v_layout)  #将self.v_layout设为整个窗口的最终布局方式
17 
18 
19 if __name__ == '__main__':
20     app = QApplication(sys.argv)
21     demo = Demo()
22     demo.show()
23     sys.exit(app.exec_())

水平布局QHBoxLayout

需要  from PyQt5.QtWidgets import QHBoxLayout

 1 import sys
 2 from PyQt5.QtWidgets import QApplication, QWidget, QLabel, QLineEdit, QHBoxLayout
 3 
 4 class Demo(QWidget):
 5 
 6     def __init__(self):
 7         super(Demo, self).__init__()
 8         self.user_label = QLabel('Username:', self)
 9         self.user_line = QLineEdit(self)  #实例化一个单行文本输入框
10 
11         self.h_layout = QHBoxLayout()  #实例化一个水平布局管理器
12         self.h_layout.addWidget(self.user_label)  #将控件添加到水平布局管理器中，先添加的出现在左边
13         self.h_layout.addWidget(self.user_line)
14 
15         self.setLayout(self.h_layout)  
16 
17 
18 if __name__ == '__main__':
19     app = QApplication(sys.argv)
20     demo = Demo()
21     demo.show()
22     sys.exit(app.exec_())

效果图：

混合使用QVBoxLayout和QHBoxLayout

import sys
from PyQt5.QtWidgets import QApplication, QWidget, QLabel, QLineEdit, QPushButton, \
QHBoxLayout, QVBoxLayout


class Demo(QWidget):

def __init__(self):
super(Demo, self).__init__()

self.user_label = QLabel('Username:', self)
self.pwd_label = QLabel('Password:', self)
self.user_line = QLineEdit(self)
self.pwd_line = QLineEdit(self)
self.login_button = QPushButton('登陆, self)
self.signin_button = QPushButton('注册', self)

self.label_v_layout = QVBoxLayout() 
self.line_v_layout = QVBoxLayout() 
self.button_h_layout = QHBoxLayout() 
self.label_line_h_layout = QHBoxLayout() 
self.all_v_layout = QVBoxLayout() 

self.label_v_layout.addWidget(self.user_label) 
self.label_v_layout.addWidget(self.pwd_label)
self.line_v_layout.addWidget(self.user_line)
self.line_v_layout.addWidget(self.pwd_line)
self.button_h_layout.addWidget(self.login_button)
self.button_h_layout.addWidget(self.signin_button)
self.label_line_h_layout.addLayout(self.label_v_layout) #在布局中添加布局
self.label_line_h_layout.addLayout(self.line_v_layout)
self.all_v_layout.addLayout(self.label_line_h_layout)
self.all_v_layout.addLayout(self.button_h_layout)

self.setLayout(self.all_v_layout)


if __name__ == '__main__':
app = QApplication(sys.argv)
demo = Demo()
demo.show()
sys.exit(app.exec_())

 效果图：

表单布局QFormLayout

 表单布局可以将控件以两列的形式进行排布，左列控件为文本标签，右列为输入型的控件

 1 import sys
 2 from PyQt5.QtWidgets import QApplication, QWidget, QLabel, QLineEdit, QPushButton, \
 3     QHBoxLayout, QVBoxLayout, QFormLayout
 4 
 5 class Demo(QWidget):
 6 
 7     def __init__(self):
 8         super(Demo, self).__init__()
 9 
10         self.user_label = QLabel('姓名:', self)
11         self.pwd_label = QLabel('密码:', self)
12         self.user_line = QLineEdit(self)
13         self.pwd_line = QLineEdit(self)
14         self.login_button = QPushButton('登陆', self)
15         self.signin_button = QPushButton('注册', self)
16 
17         self.f_layout = QFormLayout()  #实例化一个QFormLayout控件
18         self.button_h_layout = QHBoxLayout()  #用来布局按钮
19         self.all_v_layout = QVBoxLayout()  #最终布局
20 
21         self.f_layout.addRow(self.user_label, self.user_line)  # 在表单布局中添加控件
22         self.f_layout.addRow(self.pwd_label, self.pwd_line)
23         self.button_h_layout.addWidget(self.login_button)
24         self.button_h_layout.addWidget(self.signin_button)
25         self.all_v_layout.addLayout(self.f_layout)
26         self.all_v_layout.addLayout(self.button_h_layout)
27 
28         self.setLayout(self.all_v_layout)
29 
30 
31 if __name__ == '__main__':
32     app = QApplication(sys.argv)
33     demo = Demo()
34     demo.show()
35     sys.exit(app.exec_())

网格布局QGridLayout

当使用该布局管理器的时候，你可以把整个窗体想象成带有格子的，然后只要把各个控件放在相应的格子就好了

需要  from PyQt5.QtWidgets import QGridLayout

 1 import sys
 2 from PyQt5.QtWidgets import QApplication, QWidget, QLabel, QLineEdit, QPushButton, \
 3     QGridLayout, QVBoxLayout, QHBoxLayout
 4 
 5 
 6 class Demo(QWidget):
 7 
 8     def __init__(self):
 9         super(Demo, self).__init__()
10 
11         self.user_label = QLabel('姓名:', self)
12         self.pwd_label = QLabel('密码:', self)
13         self.user_line = QLineEdit(self)
14         self.pwd_line = QLineEdit(self)
15         self.login_button = QPushButton('登陆', self)
16         self.signin_button = QPushButton('注册', self)
17 
18         self.grid_layout = QGridLayout()  # 实例化一个QGridLayout布局管理器
19         self.h_layout = QHBoxLayout()
20         self.v_layout = QVBoxLayout()
21 
22         self.grid_layout.addWidget(self.user_label, 0, 0, 1, 1)  #在网格布局中添加控件
23         #遵循格式：addWidget(widget, row, column, rowSpan, columnSpan)
24         #widget就是要添加的控件
25         #row为第几行，0代表第一行；column为第几列，0代表第一列
26         #rowSpan表示要让这个控件去占用几行(默认一行)；columnSpan表示要让这个控件去占用几列(默认一列)
27         self.grid_layout.addWidget(self.user_line, 0, 1, 1, 1)
28         self.grid_layout.addWidget(self.pwd_label, 1, 0, 1, 1)
29         self.grid_layout.addWidget(self.pwd_line, 1, 1, 1, 1)
30         self.h_layout.addWidget(self.login_button)
31         self.h_layout.addWidget(self.signin_button)
32         self.v_layout.addLayout(self.grid_layout)
33         self.v_layout.addLayout(self.h_layout)  
34 
35         self.setLayout(self.v_layout)
36 
37 
38 if __name__ == '__main__':
39     app = QApplication(sys.argv)
40     demo = Demo()
41     demo.show()
42     sys.exit(app.exec_())