QGis插件QTableWidget问题

Question

我目前正在开发一个QGis插件（我使用插件生成器创建一个示例），这个插件应该在QTableWidget中显示所选VectorLayers的功能。我有两个文件cactus.py（主程序）和UI_cactus_dialog_base.py（在QtCreator上设计的Ui文件）。 问题是：从主程序我不能在QTableWidget上设置项目，我不知道为什么（我在QGis / Python编程方面很新，而且我对自我很困惑/ iface / ui实例。请帮忙！

cactus.py

class Cactus:
def __init__(self, iface):
    self.iface = iface
    self.tablewidget = QTableWidget()
    # initialize plugin directory
    self.plugin_dir = os.path.dirname(__file__)
    # initialize locale
    locale = QSettings().value('locale/userLocale')[0:2]
    locale_path = os.path.join(
        self.plugin_dir,
        'i18n',
        'Cactus_{}.qm'.format(locale))

    if os.path.exists(locale_path):
        self.translator = QTranslator()
        self.translator.load(locale_path)

        if qVersion() > '4.3.3':
            QCoreApplication.installTranslator(self.translator)

    # Create the dialog (after translation) and keep reference
    self.dlg = Ui_cactus_dialog_base()
    self.dlg.show_record = self.show_record
    self.dlg.eje_tablewidget = self.tablewidget
    # Declare instance attributes
    self.actions = []
    self.menu = self.tr(u'&Cactus')
    # TODO: We are going to let the user set this up in a future iteration
    self.toolbar = self.iface.addToolBar(u'Cactus')
    self.toolbar.setObjectName(u'Cactus')

# noinspection PyMethodMayBeStatic
def tr(self, message):

    return QCoreApplication.translate('Cactus', message)


def add_action(
    self,
    icon_path,
    text,
    callback,
    enabled_flag=True,
    add_to_menu=True,
    add_to_toolbar=True,
    status_tip=None,
    whats_this=None,
    parent=None):


    icon = QIcon(icon_path)
    action = QAction(icon, text, parent)
    action.triggered.connect(callback)
    action.setEnabled(enabled_flag)

    if status_tip is not None:
        action.setStatusTip(status_tip)

    if whats_this is not None:
        action.setWhatsThis(whats_this)

    if add_to_toolbar:
        self.toolbar.addAction(action)

    if add_to_menu:
        self.iface.addPluginToMenu(
            self.menu,
            action)

    self.actions.append(action)

    return action

def initGui(self):
    """Create the menu entries and toolbar icons inside the QGIS GUI."""

    icon_path = ':/plugins/Cactus/icon.png'
    self.add_action(
        icon_path,
        text=self.tr(u'Cactus - Creacion manzanas a partir de ejes'),
        callback=self.run,
        parent=self.iface.mainWindow())


def unload(self):
    """Removes the plugin menu item and icon from QGIS GUI."""
    for action in self.actions:
        self.iface.removePluginMenu(
            self.tr(u'&Cactus'),
            action)
        self.iface.removeToolBarIcon(action)
    # remove the toolbar
    del self.toolbar


def run(self):

    self.dlg.setupUi(self.dlg)

    """Run method that performs all the real work"""

    # show the dialog
    self.dlg.show()
    # Run the dialog event loop
    result = self.dlg.exec_()
    # See if OK was pressed
    if result:
        # Do something useful here - delete the line containing pass and
        # substitute with your code.
        pass


@pyqtSlot()
def show_record(self):
    layer = self.iface.activeLayer()   
    ejes = layer.selectedFeatures()
    print len(ejes)
    i = 0
    j = 0
    for eje in ejes:
        i = i + 1
        for column in eje:
            item = QTableWidgetItem('ejee_id')
            self.tablewidget.setItem(i, j, item)
            print item
            j = j + 1

UI_cactus_dialog_base.py

from PyQt4 import QtCore, QtGui

try:
  _fromUtf8 = QtCore.QString.fromUtf8
except AttributeError:
def _fromUtf8(s):
    return s

try:
  _encoding = QtGui.QApplication.UnicodeUTF8
def _translate(context, text, disambig):
    return QtGui.QApplication.translate(context, text, disambig, _encoding)
except AttributeError:
def _translate(context, text, disambig):
    return QtGui.QApplication.translate(context, text, disambig)

class Ui_cactus_dialog_base(QtGui.QDialog):
  def setupUi(self, cactus_dialog_base):
    cactus_dialog_base.setObjectName(_fromUtf8("cactus_dialog_base"))
    cactus_dialog_base.resize(567, 504)
    self.buffer = QtGui.QPushButton(cactus_dialog_base)
    self.buffer.setGeometry(QtCore.QRect(290, 440, 262, 41))
    self.buffer.setObjectName(_fromUtf8("buffer"))
    self.layoutWidget = QtGui.QWidget(cactus_dialog_base)
    self.layoutWidget.setGeometry(QtCore.QRect(10, 70, 541, 61))
    self.layoutWidget.setObjectName(_fromUtf8("layoutWidget"))
    self.gridLayout = QtGui.QGridLayout(self.layoutWidget)
    self.gridLayout.setObjectName(_fromUtf8("gridLayout"))
    self.lbl_capa = QtGui.QLabel(self.layoutWidget)
    self.lbl_capa.setObjectName(_fromUtf8("lbl_capa"))
    self.gridLayout.addWidget(self.lbl_capa, 0, 0, 1, 1)
    self.layer_name = QtGui.QLabel(self.layoutWidget)
    self.layer_name.setObjectName(_fromUtf8("layer_name"))
    self.gridLayout.addWidget(self.layer_name, 0, 1, 1, 1)
    self.lbl_geometria = QtGui.QLabel(self.layoutWidget)
    self.lbl_geometria.setObjectName(_fromUtf8("lbl_geometria"))
    self.gridLayout.addWidget(self.lbl_geometria, 1, 0, 1, 1)
    self.geometry_type = QtGui.QLabel(self.layoutWidget)
    self.geometry_type.setObjectName(_fromUtf8("geometry_type"))
    self.gridLayout.addWidget(self.geometry_type, 1, 1, 1, 1)
    self.groupBox = QtGui.QGroupBox(cactus_dialog_base)
    self.groupBox.setGeometry(QtCore.QRect(10, 150, 541, 201))
    self.groupBox.setObjectName(_fromUtf8("groupBox"))
    self.eje_tablewidget = QtGui.QTableWidget(self.groupBox)
    self.eje_tablewidget.setGeometry(QtCore.QRect(10, 20, 521, 171))
    self.eje_tablewidget.setObjectName(_fromUtf8("eje_tablewidget"))
    self.eje_tablewidget.setColumnCount(18)
    self.eje_tablewidget.setRowCount(0)
    item = QtGui.QTableWidgetItem()
    self.eje_tablewidget.setHorizontalHeaderItem(0, item)
    item = QtGui.QTableWidgetItem()
    self.eje_tablewidget.setHorizontalHeaderItem(1, item)
    item = QtGui.QTableWidgetItem()
    self.eje_tablewidget.setHorizontalHeaderItem(2, item)
    item = QtGui.QTableWidgetItem()
    self.eje_tablewidget.setHorizontalHeaderItem(3, item)
    item = QtGui.QTableWidgetItem()
    self.eje_tablewidget.setHorizontalHeaderItem(4, item)
    item = QtGui.QTableWidgetItem()
    self.eje_tablewidget.setHorizontalHeaderItem(5, item)
    item = QtGui.QTableWidgetItem()
    self.eje_tablewidget.setHorizontalHeaderItem(6, item)
    item = QtGui.QTableWidgetItem()
    self.eje_tablewidget.setHorizontalHeaderItem(7, item)
    item = QtGui.QTableWidgetItem()
    self.eje_tablewidget.setHorizontalHeaderItem(8, item)
    item = QtGui.QTableWidgetItem()
    self.eje_tablewidget.setHorizontalHeaderItem(9, item)
    item = QtGui.QTableWidgetItem()
    self.eje_tablewidget.setHorizontalHeaderItem(10, item)
    item = QtGui.QTableWidgetItem()
    self.eje_tablewidget.setHorizontalHeaderItem(11, item)
    item = QtGui.QTableWidgetItem()
    self.eje_tablewidget.setHorizontalHeaderItem(12, item)
    item = QtGui.QTableWidgetItem()
    self.eje_tablewidget.setHorizontalHeaderItem(13, item)
    item = QtGui.QTableWidgetItem()
    self.eje_tablewidget.setHorizontalHeaderItem(14, item)
    item = QtGui.QTableWidgetItem()
    self.eje_tablewidget.setHorizontalHeaderItem(15, item)
    item = QtGui.QTableWidgetItem()
    self.eje_tablewidget.setHorizontalHeaderItem(16, item)
    item = QtGui.QTableWidgetItem()
    self.eje_tablewidget.setHorizontalHeaderItem(17, item)

    self.retranslateUi(cactus_dialog_base)
    QtCore.QObject.connect(self.buffer, QtCore.SIGNAL(_fromUtf8("clicked()")), cactus_dialog_base.show_record)
    QtCore.QMetaObject.connectSlotsByName(cactus_dialog_base)

def retranslateUi(self, cactus_dialog_base):
    cactus_dialog_base.setWindowTitle(_translate("cactus_dialog_base",           "Cactus", None))
    self.buffer.setText(_translate("cactus_dialog_base", "Asignar Buffer", None))
    self.lbl_capa.setText(_translate("cactus_dialog_base", "Capa Actual:", None))
    self.layer_name.setText(_translate("cactus_dialog_base", "Layer_Name", None))
    self.lbl_geometria.setText(_translate("cactus_dialog_base", "Tipo Geometría:", None))
    self.geometry_type.setText(_translate("cactus_dialog_base", "Geometry_Type", None))
    self.groupBox.setTitle(_translate("cactus_dialog_base", "Ejes Seleccionados", None))
    item = self.eje_tablewidget.horizontalHeaderItem(0)
    item.setText(_translate("cactus_dialog_base", "ejee_id", None))
    item = self.eje_tablewidget.horizontalHeaderItem(1)
    item.setText(_translate("cactus_dialog_base", "ejee_tipo", None))
    item = self.eje_tablewidget.horizontalHeaderItem(2)
    item.setText(_translate("cactus_dialog_base", "ejee_nombre", None))
    item = self.eje_tablewidget.horizontalHeaderItem(3)
    item.setText(_translate("cactus_dialog_base", "ejee_nombre_completo", None))
    item = self.eje_tablewidget.horizontalHeaderItem(4)
    item.setText(_translate("cactus_dialog_base", "ejee_izq_inicio", None))
    item = self.eje_tablewidget.horizontalHeaderItem(5)
    item.setText(_translate("cactus_dialog_base", "ejee_izq_termino", None))
    item = self.eje_tablewidget.horizontalHeaderItem(6)
    item.setText(_translate("cactus_dialog_base", "ejee_der_inicio", None))
    item = self.eje_tablewidget.horizontalHeaderItem(7)
    item.setText(_translate("cactus_dialog_base", "ejee_der_termino", None))
    item = self.eje_tablewidget.horizontalHeaderItem(8)
    item.setText(_translate("cactus_dialog_base", "ejee_clase_funcional", None))
    item = self.eje_tablewidget.horizontalHeaderItem(9)
    item.setText(_translate("cactus_dialog_base", "ejee_categoria_velocidad", None))
    item = self.eje_tablewidget.horizontalHeaderItem(10)
    item.setText(_translate("cactus_dialog_base", "ejee_doble_sentido", None))
    item = self.eje_tablewidget.horizontalHeaderItem(11)
    item.setText(_translate("cactus_dialog_base", "ejee_transito_automovil", None))
    item = self.eje_tablewidget.horizontalHeaderItem(12)
    item.setText(_translate("cactus_dialog_base", "ejee_transito_bus", None))
    item = self.eje_tablewidget.horizontalHeaderItem(13)
    item.setText(_translate("cactus_dialog_base", "ejee_pavimentado", None))
    item = self.eje_tablewidget.horizontalHeaderItem(14)
    item.setText(_translate("cactus_dialog_base", "ejee_pago", None))
    item = self.eje_tablewidget.horizontalHeaderItem(15)
    item.setText(_translate("cactus_dialog_base", "ejee_link_id", None))
    item = self.eje_tablewidget.horizontalHeaderItem(16)
    item.setText(_translate("cactus_dialog_base", "ejee_geom", None))
    item = self.eje_tablewidget.horizontalHeaderItem(17)
    item.setText(_translate("cactus_dialog_base", "ejee_explica", None))

Answer 1

有几种方法可以做你想要的。目前的代码中缺少一件事。

需要告诉QtableWidget何时使用setRowCount()方法添加行。

所以实际上你需要在使用之前添加一行。列也是如此。

在你启动“for循环”之前，你需要setRowCount()为零以“擦除表中的数据”，这就是QTableWidget的工作方式。

您还可以使用表格的rowCount和columnCount使其更具动态性，或使用eje.attribute["column_name"]获取要添加到标准列位置的特定列。例如，你已经知道了

eje.attribue["user_name"]

是第3列，因此您不需要为列添加嵌套循环，而是可以 - ＆gt;

self.tablewidget.setItem(QTableWidgetItem(self.tablewidget.rowCount()-1,3,eje.attribute["user_name"]))