Learning pyqt basics 3

Layout manager in pyqt4

Layout management is the method for us to arrange the location in the window. There are two ways to manage layout: absolute positioning and layout category. In general, the absolute layout method is rarely used, just like Web pages. Currently, there are no popular responsive la S.

Layout classes)

The layout manager in layout category mode is more flexible and practical than the layout manager in absolute positioning mode. It is the first layout management method for window components. The most basic layout types are qhboxlayout and qvboxlayout.

class Boxlayout(QtGui.QWidget):    def __init__(self, parent = None):        QtGui.QWidget.__init__(self)        self.setWindowTitle(‘box layout‘)        ok = QtGui.QPushButton(‘OK‘)        cancel = QtGui.QPushButton(‘Cancel‘)        hbox = QtGui.QHBoxLayout()        hbox.addStretch(1)        hbox.addWidget(ok)        hbox.addWidget(cancel)        vbox = QtGui.QVBoxLayout()        vbox.addStretch(1)        vbox.addLayout(hbox)        self.setLayout(vbox)        self.resize(300, 150)

• The code is easy to understand. As for the vbox. addstretch () method, add a scaling interval element (for more information, see the document)

Grid layout

class GridLayout(QtGui.QWidget):    def __init__(self, parent = None):        QtGui.QWidget.__init__(self)        self.setWindowTitle(‘grid layout‘)        names = [‘Cls‘, ‘Bck‘, ‘‘, ‘Close‘, ‘7‘, ‘8‘, ‘9‘, ‘/‘,        ‘4‘, ‘5‘, ‘6‘, ‘*‘, ‘1‘, ‘2‘, ‘3‘,        ‘-‘, ‘0‘, ‘.‘, ‘=‘, ‘+‘]    grid = QtGui.QGridLayout()    j = 0    pos = [(0, 0), (0, 1), (0, 2), (0, 3),    (1, 0), (1, 1), (1, 2), (1, 3),    (2, 0), (2, 1), (2, 2), (2, 3),    (3, 0), (3, 1), (3, 2), (3, 3),    (4, 0), (4, 1), (4, 2), (4, 3)]    for i in names:        button = QtGui.QPushButton(i)        if j == 2:            grid.addWidget(QtGui.QLabel(‘‘), 0, 2)        else:            grid.addWidget(button, pos[j][0], pos[j][1])        j = j + 1    self.setLayout(grid)

• I feel that the code is still quite understandable, and I didn't talk much about it in the book...