如何在没有可见空白的情况下扩展/减小QTable视图

Question

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答案应使用下面的代码示例解决问题

我有一个子类QAbstractTableModel 在不滚动的情况下以全尺寸显示“表视图”中的数据我已经打开了滚动条 为了摆脱表格视图周围的空白，我将垂直/水平表格长度设置为特定值。

问题是我已经在模型中添加了添加/删除行方法，因此表视图现在可以扩展/缩小 调整表视图行为以全尺寸显示数据，并且没有空白，我将水平标题设置为table_view.horizontalHeader().setStretchLastSection(True)正确切断水平方向上的空白 同样的操作也用于空白页眉的垂直标题剪切，但覆盖了最后一行

我尝试使用以下方法将每一行设置为默认大小

table_view.verticalHeader().setSectionResizeMode(qtw.QHeaderView.Fixed)
        table_view.verticalHeader().setDefaultSectionSize(40)

但是这会再次打开空白区域

简而言之：我正在寻找一种在表格视图中以全尺寸显示模型数据而又不留空格的方法，同时希望能够删除/插入一行

代码示例

#!/usr/bin/env python

"""

"""

import sys
import re


from PyQt5 import QtWidgets as qtw
from PyQt5 import QtCore as qtc
from PyQt5.QtCore import Qt

from PyQt5 import QtGui as qtg


class ViewModel(qtc.QAbstractTableModel):

    def __init__(self, input_data=None):
        super().__init__()

        self.input_data = input_data or [["data","data","data","data"],["data","data","data","data"]]

    #

    def data(self, index, role):  # parameter index, role are needed !
        """

        """
        if role == qtc.Qt.DisplayRole:
            try:
                text = self.input_data[index.row()][index.column()]
            except IndexError:
                text = None

            return text

    def rowCount(self, index=qtc.QModelIndex()):
        return 0 if index.isValid() else len(self.input_data)


    def columnCount(self, index):
        return len(self.input_data[0])


    def insertRows(self, position, rows, parent=qtc.QModelIndex()):

        print(position) # -1
        position = (position + self.rowCount()) if position < 0 else position
        start = position

        end = position + rows - 1

        if end <= 8:
            self.beginInsertRows(parent, start, end)
            self.input_data.append([])
            self.endInsertRows()
            return True
        else:
            return False


    def removeRows(self, position, rows, parent=qtc.QModelIndex()):
        position = (position + self.rowCount()) if position < 0 else position

        start = position

        end = position + rows - 1

        if end >= 1:
            self.beginRemoveRows(parent, start, end)
            del self.input_data[start:end + 1]
            self.endRemoveRows()
            return True
        else:
            return False



    def headerData(self, section, orientation, role):

        if role == qtc.Qt.DisplayRole:

            if orientation == qtc.Qt.Horizontal:
                return "hight " + str(section+1) + " /mm"
            if orientation == qtc.Qt.Vertical:
                return "width " + str(section+1)


    def flags(self, index):
        return qtc.Qt.ItemIsEditable | qtc.Qt.ItemIsSelectable | qtc.Qt.ItemIsEnabled

    def setData(self, index, value, role=qtc.Qt.EditRole):
        if role == qtc.Qt.EditRole:
            try:
                row = index.row()
                column = index.column()

                pattern = '^[\d]+(?:,[\d]+)?$'


                if re.fullmatch(pattern, value, flags=0):
                    print("true")
                    self.input_data[row][column] = value  # float

                else:
                    print("nope")
                    pass

                return True

            except ValueError:
                print("not a number")
                return False


    def display_model_data(self):
        print(self.input_data)


class MainWindow(qtw.QWidget):
    def __init__(self):
        super().__init__()

        # geometry
        self.setGeometry(900, 360, 700, 800)


        # View
        table_view = qtw.QTableView()



        # done # turn scroll bars off
        table_view.setVerticalScrollBarPolicy(Qt.ScrollBarAlwaysOff)
        table_view.setHorizontalScrollBarPolicy(Qt.ScrollBarAlwaysOff)





        self.model = ViewModel()
        table_view.setModel(self.model)




        table_view.horizontalHeader().setStretchLastSection(True)
        # table_view.verticalHeader().setStretchLastSection(True)

        table_view.verticalHeader().setSectionResizeMode(qtw.QHeaderView.Fixed)
        table_view.verticalHeader().setDefaultSectionSize(24)

        table_view.verticalHeader().setStretchLastSection(True)
        #     verticalHeader->setSectionResizeMode(QHeaderView::Fixed);
        # verticalHeader->setDefaultSectionSize(24);



        # widgets
        self.insert_row_button = qtw.QPushButton("insert row")
        self.deleate_row_button = qtw.QPushButton("deleate row")

        # layout
        layout = qtw.QVBoxLayout()
        layout.addWidget(table_view)
        layout.addWidget(self.insert_row_button)
        layout.addWidget(self.deleate_row_button)


        self.setLayout(layout)
        self.show()

        # function
        self.insert_row_button.clicked.connect(lambda: self.model.insertRows(-1, 1))
        self.deleate_row_button.clicked.connect(lambda: self.model.removeRows(-1, 1))


if __name__ == '__main__':
    app = qtw.QApplication(sys.argv)
    w = MainWindow()
    sys.exit(app.exec_())

Answer 1

空间无法神奇消失。假设表格总高度为600。如果表格中有两行，则第一行为40。然后，如果您不想在表格底部空白，则第二行为600-40 = 560 。如果将每行的高度设置为40，则空格的高度将为600-2 * 40 =520。您不需要（总高度为600）+（两行，每行40条）+（无空格）底部的空格）。

所以，让我猜，您想要（a。底部没有空白）+（b，空间均匀地分成几行，因此最后一行看起来不会很奇怪。）。如果是这样，我已经将您的代码编辑到下面，其中解释了所有内容：

"""

"""

import sys
import re


from PyQt5 import QtWidgets as qtw
from PyQt5 import QtCore as qtc
from PyQt5.QtCore import Qt

from PyQt5 import QtGui as qtg


class ViewModel(qtc.QAbstractTableModel):

    def __init__(self, input_data=None):
        super().__init__()

        self.input_data = input_data or [["data","data","data","data"],["data","data","data","data"]]

    #

    def data(self, index, role):  # parameter index, role are needed !
        """

        """
        if role == qtc.Qt.DisplayRole:
            try:
                text = self.input_data[index.row()][index.column()]
            except IndexError:
                text = None

            return text

    def rowCount(self, index=qtc.QModelIndex()):
        return 0 if index.isValid() else len(self.input_data)


    def columnCount(self, index):
        return len(self.input_data[0])


    def insertRows(self, position, rows, parent=qtc.QModelIndex()):

        print(position) # -1
        position = (position + self.rowCount()) if position < 0 else position
        start = position

        end = position + rows - 1

        if end <= 8:
            self.beginInsertRows(parent, start, end)
            self.input_data.append([])
            self.endInsertRows()
            return True
        else:
            return False


    def removeRows(self, position, rows, parent=qtc.QModelIndex()):
        position = (position + self.rowCount()) if position < 0 else position

        start = position

        end = position + rows - 1

        if end >= 1:
            self.beginRemoveRows(parent, start, end)
            del self.input_data[start:end + 1]
            self.endRemoveRows()
            return True
        else:
            return False



    def headerData(self, section, orientation, role):

        if role == qtc.Qt.DisplayRole:

            if orientation == qtc.Qt.Horizontal:
                return "hight " + str(section+1) + " /mm"
            if orientation == qtc.Qt.Vertical:
                return "width " + str(section+1)


    def flags(self, index):
        return qtc.Qt.ItemIsEditable | qtc.Qt.ItemIsSelectable | qtc.Qt.ItemIsEnabled

    def setData(self, index, value, role=qtc.Qt.EditRole):
        if role == qtc.Qt.EditRole:
            try:
                row = index.row()
                column = index.column()

                pattern = '^[\d]+(?:,[\d]+)?$'


                if re.fullmatch(pattern, value, flags=0):
                    print("true")
                    self.input_data[row][column] = value  # float

                else:
                    print("nope")
                    pass

                return True

            except ValueError:
                print("not a number")
                return False


    def display_model_data(self):
        print(self.input_data)


class NoBlankSpaceAtBottomEnvenlySplitTableView(qtw.QTableView):
    def sizeHintForRow(self, row):
        row_count = self.model().rowCount()
        height = self.viewport().height()
        row_height = int(height/row_count)
        if row < row_count - 1:
            return row_height
        else:
            return super().sizeHintForRow(row)


class MainWindow(qtw.QWidget):
    def __init__(self):
        super().__init__()

        # geometry
        self.setGeometry(900, 360, 700, 800)


        # View
        # table_view = qtw.QTableView()
        table_view = NoBlankSpaceAtBottomEnvenlySplitTableView()



        # done # turn scroll bars off
        table_view.setVerticalScrollBarPolicy(Qt.ScrollBarAlwaysOff)
        table_view.setHorizontalScrollBarPolicy(Qt.ScrollBarAlwaysOff)





        self.model = ViewModel()
        table_view.setModel(self.model)




        table_view.horizontalHeader().setStretchLastSection(True)
        table_view.verticalHeader().setStretchLastSection(True)

        # table_view.verticalHeader().setSectionResizeMode(qtw.QHeaderView.Fixed)
        #table_view.verticalHeader().setDefaultSectionSize(24)
        table_view.verticalHeader().setSectionResizeMode(
            qtw.QHeaderView.ResizeToContents)  # Add this line

        table_view.verticalHeader().setStretchLastSection(True)
        #     verticalHeader->setSectionResizeMode(QHeaderView::Fixed);
        # verticalHeader->setDefaultSectionSize(24);



        # widgets
        self.insert_row_button = qtw.QPushButton("insert row")
        self.deleate_row_button = qtw.QPushButton("deleate row")

        # layout
        layout = qtw.QVBoxLayout()
        layout.addWidget(table_view)
        layout.addWidget(self.insert_row_button)
        layout.addWidget(self.deleate_row_button)


        self.setLayout(layout)
        self.show()

        # function
        self.insert_row_button.clicked.connect(lambda: self.model.insertRows(-1, 1))
        self.deleate_row_button.clicked.connect(lambda: self.model.removeRows(-1, 1))


if __name__ == '__main__':
    app = qtw.QApplication(sys.argv)
    w = MainWindow()
    sys.exit(app.exec_())