调整自定义 QTableWidget 的大小（宽/高）

Question

我需要一个基于QTabelModel 和QTableView 的QTableWidget，并在表格上方添加了一些按钮。见下图：

应调整QTableWidget 的宽度，使其不小于合理的最小值，并且不超出其上方的按钮；特别是第 1、2 和 4 列的大小应根据其内容进行调整，第 3 列 Aberrations 应扩大以填补右侧的空白。我想知道如何在代码中做到这一点。

以下是我用于自定义QTableWidget（PyQt5，Python3）的代码的最小示例：

from PyQt5 import QtGui, QtCore, QtWidgets
import numpy as np

#-- Table Model
class MyTableModel(QtCore.QAbstractTableModel):

    def __init__(self, data, parent=None, *args):
        super(MyTableModel, self).__init__(parent)

        # table data
        self.table_data = data
        self.rows_nr, self.columns_nr = data.shape

        # vertical & horizontal header labels
        self.hheaders = ["Head-{}".format(i) for i in range(self.columns_nr)]
        self.vheaders = ["Row-{}".format(i) for i in range(self.rows_nr)]

    # nr of rows
    def rowCount(self, parent):
        return self.rows_nr

    # nr of columns
    def columnCount(self, parent):
        return self.columns_nr

    # row and column headers
    def headerData(self, section, orientation, role):
        if role == QtCore.Qt.DisplayRole:
            if orientation == QtCore.Qt.Horizontal:
                return self.hheaders[section]
            #END if

        #ELSE:
        return QtCore.QVariant()

    # display table contents
    def data(self, index, role=QtCore.Qt.DisplayRole):        
        r_ = index.row()
        c_ = index.column()

        if role == QtCore.Qt.DisplayRole:
            return "{}".format(data[r_, c_])
        #ELSE:
        return QtCore.QVariant()

    # set data
    def setData(self, index, value, role):

        r_ = index.row()
        c_ = index.column()

        # editable fields
        if role == QtCore.Qt.EditRole:
            # interprete values
            self.table_data[r_,c_] = str(value)

        return True

    # view/edit flags
    def flags(self, index):
        r_ = index.row()
        c_ = index.column()

        return QtCore.Qt.ItemIsEnabled


class MyTableWidget(QtWidgets.QWidget):
    def __init__(self, data, *args):
        super(MyTableWidget, self).__init__(*args)

        #-- table model
        tablemodel = MyTableModel(data=data, parent=self)

        #-- table view
        tableview = QtWidgets.QTableView()
        tableview.setModel(tablemodel)
        tableview.verticalHeader().hide() # hide vertical/row headers

        # size policy
        tableview.setSizeAdjustPolicy(QtWidgets.QAbstractScrollArea.AdjustToContents)
        tableview.setSizePolicy(QtWidgets.QSizePolicy.Minimum, QtWidgets.QSizePolicy.Minimum)

        #-- layouts
        #--- buttons
        button_hlayout = QtWidgets.QHBoxLayout()
        button_hlayout.addWidget(QtWidgets.QPushButton("Button 1"))
        button_hlayout.addWidget(QtWidgets.QPushButton("Button 2"))
        button_hlayout.addWidget(QtWidgets.QPushButton("Button 3"))

        #--- table
        table_layout = QtWidgets.QVBoxLayout()
        table_layout.addLayout(button_hlayout)
        table_layout.addWidget(tableview)
        self.setLayout(table_layout)
#----------------------------------------

#-- produce sample data
data = np.empty(shape=(3,4), dtype=np.object)
for r in range(3):
    for c in range(4):
        data[r,c] = str(list(range((r+1) * (c+1))))

app = QtWidgets.QApplication([""])
w = MyTableWidget(data=data)
w.show()
app.exec_()

Answer 1

void QHeaderView::setSectionResizeMode(int logicalIndex, QHeaderView::ResizeMode 模式)

设置如何将标头中由logicalIndex指定的部分调整为给定模式所描述的限制。调用此函数时，逻辑索引应该存在。

from PyQt5 import QtGui, QtCore, QtWidgets
import numpy as np

#-- Table Model
class MyTableModel(QtCore.QAbstractTableModel):

    def __init__(self, data, parent=None, *args):
        super(MyTableModel, self).__init__(parent)

        # table data
        self.table_data = data
        self.rows_nr, self.columns_nr = data.shape

        # vertical & horizontal header labels
        self.hheaders = ["Head-{}".format(i) for i in range(self.columns_nr)]
        self.vheaders = ["Row-{}".format(i) for i in range(self.rows_nr)]

    # nr of rows
    def rowCount(self, parent):
        return self.rows_nr

    # nr of columns
    def columnCount(self, parent):
        return self.columns_nr

    # row and column headers
    def headerData(self, section, orientation, role):
        if role == QtCore.Qt.DisplayRole:
            if orientation == QtCore.Qt.Horizontal:
                return self.hheaders[section]
            #END if

        #ELSE:
        return QtCore.QVariant()

    # display table contents
    def data(self, index, role=QtCore.Qt.DisplayRole):        
        r_ = index.row()
        c_ = index.column()

        if role == QtCore.Qt.DisplayRole:
            return "{}".format(data[r_, c_])
        #ELSE:
        return QtCore.QVariant()

    # set data
    def setData(self, index, value, role):

        r_ = index.row()
        c_ = index.column()

        # editable fields
        if role == QtCore.Qt.EditRole:
            # interprete values
            self.table_data[r_,c_] = str(value)

        return True

    # view/edit flags
    def flags(self, index):
        r_ = index.row()
        c_ = index.column()

        return QtCore.Qt.ItemIsEnabled


class MyTableWidget(QtWidgets.QWidget):
    def __init__(self, data, *args):
        super(MyTableWidget, self).__init__(*args)

        #-- table model
        tablemodel = MyTableModel(data=data, parent=self)

        #-- table view
        tableview = QtWidgets.QTableView()
        tableview.setModel(tablemodel)
        tableview.verticalHeader().hide() # hide vertical/row headers
        
        #-- +++
        tableview.setAlternatingRowColors(True)
        tableview.horizontalHeader().setSectionResizeMode(QtWidgets.QHeaderView.Stretch)
        tableview.horizontalHeader().setSectionResizeMode(0, QtWidgets.QHeaderView.ResizeToContents)
        tableview.horizontalHeader().setSectionResizeMode(1, QtWidgets.QHeaderView.ResizeToContents)
        tableview.horizontalHeader().setSectionResizeMode(3, QtWidgets.QHeaderView.ResizeToContents)

        # size policy
        tableview.setSizeAdjustPolicy(QtWidgets.QAbstractScrollArea.AdjustToContents)
        #tableview.setSizePolicy(QtWidgets.QSizePolicy.Minimum, QtWidgets.QSizePolicy.Minimum) # ---
        tableview.setSizePolicy(QtWidgets.QSizePolicy.Expanding, QtWidgets.QSizePolicy.Minimum)# +++

        #-- layouts
        #--- buttons
        button_hlayout = QtWidgets.QHBoxLayout()
        button_hlayout.addWidget(QtWidgets.QPushButton("Button 1"))
        button_hlayout.addWidget(QtWidgets.QPushButton("Button 2"))
        button_hlayout.addWidget(QtWidgets.QPushButton("Button 3"))

        #--- table
        table_layout = QtWidgets.QVBoxLayout()
        table_layout.addLayout(button_hlayout)
        table_layout.addWidget(tableview)
        self.setLayout(table_layout)
#----------------------------------------

#-- produce sample data
data = np.empty(shape=(3,4), dtype=np.object)
for r in range(3):
    for c in range(4):
        data[r,c] = str(list(range((r+1) * (c+1))))

app = QtWidgets.QApplication([""])
w = MyTableWidget(data=data)
w.show()
app.exec_()

在上面的代码中，tableview.horizontalHeader().SetSectionResizeMode(QtWidgets.QHeaderView.Stretch) 将 Stretch 模式应用于所有列，其余 3 个运算符将相应的列设置为 ResizeToContents 模式。

小部件窗口的大小调整行为由setSizePolicy 方法确定。在这种情况下，策略也可以是tableview.setSizePolicy(QtWidgets.QSizePolicy.Expanding, QtWidgets.QSizePolicy.Minimum)，它允许用户放大或缩小小部件窗口。