如何从使用 setItemWidget 设置的 QListWidgetItem 获取按钮信号？如何删除没有空格的 QListWidgetItem？

【问题标题】：How to get signal of button from QListWidgetItem, that was set using setItemWidget? How to delete QListWidgetItem without blank space?如何从使用 setItemWidget 设置的 QListWidgetItem 获取按钮信号？如何删除没有空格的 QListWidgetItem？
【发布时间】：2019-10-06 21:13:40
【问题描述】：

简介：

我有listWidget，其中包含QListWidgetItem(s)。他们每个人都有 3 个按钮。 'Close' 必须彻底销毁QListWidgetItem，推迟必须暂时关闭，但会在定时器的下一次超时时出现。所以我必须将它保存到列表或临时隐藏。 在 Designer 中创建的 UI 部件。

图片：

已经试过了：

我已经尝试过@pyqtSlot(QListWidgetItem) def on_itemClicked(self, item)，但信号不会在单击按钮时发出 - 只有在单击项目本身时才会发出。即使您单击项目，它也会关闭，但它仍然具有QListWidgetItem 的“小部件框架”，并且仍然可以通过单击访问。所以它不会关闭QListWidgetItem，而是关闭inst_pop_up。

图片：

我找到了解决方案，使用 eventFilter，但没有弄清楚如何在 Python 中正确设置它。 我试图从它的按钮“关闭”关闭 onePopUp（在此处取消注释以查看：self.pushButton_close.clicked.connect(self.close)），但它也留下了“小部件框架”。 popupMain 实例在 MainWindow 类的 init 中启动：

self.pop_up_main = popupMain()

MainWindow 类中调用的定时器：

   self.pop_up_main.slot_add_new()
   self.pop_up_main.show()

问题出在 onePopUp 或 popupMain

popup.py

import sys
from PyQt5.QtCore import *
from PyQt5.QtGui import *
from PyQt5.QtWidgets import *
from PyQt5.uic import loadUi

class onePopUp(QWidget):
    def __init__(self):
        counter = 0
        super(onePopUp, self).__init__(parent=None)
        loadUi('one_pop_up.ui', self)
        # self.setAttribute(Qt.WA_DeleteOnClose, on=True)
    # self.pushButton_close.clicked.connect(self.close)

    def closeEvent(self, event):
        print('onePopUp : close event')
    # super().close()

class popupMain(QDialog):
    def __init__(self):
        super(popupMain, self).__init__(parent=None)
        loadUi('master_pop_up.ui', self)
        self.listWidget.itemPressed.connect(self.on_itemClicked)
        # Set up the user interface from Designer.
        self.pushButton_add_extra_record.clicked.connect(self.slot_add_new)
        # self.installEventFilter()
        self.list_of_postponed_items = list()
    @pyqtSlot(QListWidgetItem)
    def on_itemClicked(self, item):
        print('in on_itemClicked')
        print('item is {}'.format(item))
        # i = self.listWidget.item(item)
        self.listWidget.removeItemWidget(item)

    # def eventFilter(self, object, event):
    #
    # if event:
    #       print(event, repr(event))
    #       if object == self.dateEdit_date_of_record and event.type() == QMouseEvent.MouseButtonDblClick:
    #           print('dblclick!!!')
    #           self.dateEdit_date_of_record.setDisabled(False)
    #   return super(DialogAddItemRecords, self).eventFilter(object, event)

    def slot_add_new(self):
        print('im in slot_add_new')
        # Creating  a new list widget item whose parent is the listwidget itself
        # QListWidgetItem * listWidgetItem = new QListWidgetItem(ui->listWidget);
        list_widget_item = QListWidgetItem(self.listWidget)
        list_widget_item.setFlags(list_widget_item.flags() & ~Qt.ItemIsSelectable)
        # list_widget_item.setFlags(list_widget_item.flags() & ~Qt.ItemIsSelectable)

        # Adding the item to the listwidget
        # ui->listWidget->addItem(listWidgetItem);
        self.listWidget.addItem(list_widget_item)
        # Creating an object of the designed widget which is to be added to the listwidget
        # TheWidgetItem * theWidgetItem = new TheWidgetItem;
        inst_pop_up = onePopUp()
        inst_pop_up.timeEdit.setTime(QTime.currentTime().addSecs(-15 * 60))
        inst_pop_up.timeEdit_2.setTime(QTime.currentTime())
        # Making sure that  the listWidgetItem has the same size as the TheWidgetItem
        # listWidgetItem->setSizeHint(theWidgetItem->sizeHint());
        list_widget_item.setSizeHint(inst_pop_up.frameSize())
        # print(inst_pop_up.dockWidget.testAttribute())
        inst_pop_up.label_header.setText('test')
        # Finally adding the itemWidget to  the list
        # ui->listWidget->setItemWidget(listWidgetItem, theWidgetItem);
        self.listWidget.setItemWidget(list_widget_item, inst_pop_up)
    # self.listWidget.addItem(list_widget_item, inst_pop_up)

# def slot_delete_item(self):
#   list_widget_item = QListWidgetItem(self.listWidget)
# removeItemWidget

# popup_list_widget = QListWidget()
# one_pop_up_1 = onePopUp()
# popup_list_widget.addItem(one_pop_up_1)

def popup_main():
    app = QApplication(sys.argv)
    window = popupMain()
    window.show()
    sys.exit(app.exec_())


if __name__ == '__main__':
    popup_main()

//master_pop_up.ui

<ui version="4.0">
 <class>Dialog</class>
 <widget class="QDialog" name="Dialog">
  <property name="geometry">
   <rect>
    <x>0</x>
    <y>0</y>
    <width>481</width>
    <height>203</height>
   </rect>
  </property>
  <property name="font">
   <font>
    <family>Segoe UI</family>
    <pointsize>12</pointsize>
   </font>
  </property>
  <property name="windowTitle">
   <string>Dialog</string>
  </property>
  <layout class="QVBoxLayout" name="verticalLayout">
   <item>
    <layout class="QHBoxLayout" name="horizontalLayout">
     <item>
      <widget class="QPushButton" name="pushButton">
       <property name="sizePolicy">
        <sizepolicy hsizetype="Fixed" vsizetype="Fixed">
         <horstretch>0</horstretch>
         <verstretch>0</verstretch>
        </sizepolicy>
       </property>
       <property name="text">
        <string/>
       </property>
       <property name="icon">
        <iconset>
         <normaloff>icons/application-sidebar-list.png</normaloff>icons/application-sidebar-list.png</iconset>
       </property>
       <property name="iconSize">
        <size>
         <width>24</width>
         <height>24</height>
        </size>
       </property>
       <property name="flat">
        <bool>true</bool>
       </property>
      </widget>
     </item>
     <item>
      <widget class="QPushButton" name="pushButton_add_extra_record">
       <property name="sizePolicy">
        <sizepolicy hsizetype="Minimum" vsizetype="Fixed">
         <horstretch>0</horstretch>
         <verstretch>0</verstretch>
        </sizepolicy>
       </property>
       <property name="text">
        <string>Add extra record</string>
       </property>
       <property name="icon">
        <iconset>
         <normaloff>icons/plus.png</normaloff>icons/plus.png</iconset>
       </property>
       <property name="iconSize">
        <size>
         <width>24</width>
         <height>24</height>
        </size>
       </property>
       <property name="flat">
        <bool>true</bool>
       </property>
      </widget>
     </item>
     <item>
      <widget class="QPushButton" name="pushButton_postpone_all">
       <property name="text">
        <string>Postpone all</string>
       </property>
       <property name="icon">
        <iconset>
         <normaloff>icons/alarm-clock-big_24_24.png</normaloff>icons/alarm-clock-big_24_24.png</iconset>
       </property>
       <property name="iconSize">
        <size>
         <width>24</width>
         <height>24</height>
        </size>
       </property>
       <property name="flat">
        <bool>true</bool>
       </property>
      </widget>
     </item>
     <item>
      <widget class="QPushButton" name="pushButton_close_all">
       <property name="text">
        <string>Close all</string>
       </property>
       <property name="icon">
        <iconset>
         <normaloff>icons/cross.png</normaloff>icons/cross.png</iconset>
       </property>
       <property name="iconSize">
        <size>
         <width>24</width>
         <height>24</height>
        </size>
       </property>
       <property name="flat">
        <bool>true</bool>
       </property>
      </widget>
     </item>
     <item>
      <widget class="QPushButton" name="pushButton">
       <property name="sizePolicy">
        <sizepolicy hsizetype="Fixed" vsizetype="Fixed">
         <horstretch>0</horstretch>
         <verstretch>0</verstretch>
        </sizepolicy>
       </property>
       <property name="text">
        <string/>
       </property>
       <property name="icon">
        <iconset>
         <normaloff>icons/gear.png</normaloff>icons/gear.png</iconset>
       </property>
       <property name="iconSize">
        <size>
         <width>24</width>
         <height>24</height>
        </size>
       </property>
       <property name="flat">
        <bool>true</bool>
       </property>
      </widget>
     </item>
    </layout>
   </item>
   <item>
    <widget class="QListWidget" name="listWidget">
     <property name="acceptDrops">
      <bool>false</bool>
     </property>
     <property name="sizeAdjustPolicy">
      <enum>QAbstractScrollArea::AdjustToContents</enum>
     </property>
     <property name="editTriggers">
      <set>QAbstractItemView::NoEditTriggers</set>
     </property>
     <property name="tabKeyNavigation">
      <bool>true</bool>
     </property>
     <property name="showDropIndicator" stdset="0">
      <bool>false</bool>
     </property>
     <property name="dragDropMode">
      <enum>QAbstractItemView::NoDragDrop</enum>
     </property>
     <property name="defaultDropAction">
      <enum>Qt::IgnoreAction</enum>
     </property>
     <property name="alternatingRowColors">
      <bool>true</bool>
     </property>
     <property name="selectionMode">
      <enum>QAbstractItemView::SingleSelection</enum>
     </property>
     <property name="horizontalScrollMode">
      <enum>QAbstractItemView::ScrollPerItem</enum>
     </property>
     <property name="movement">
      <enum>QListView::Static</enum>
     </property>
     <property name="isWrapping" stdset="0">
      <bool>false</bool>
     </property>
     <property name="resizeMode">
      <enum>QListView::Adjust</enum>
     </property>
     <property name="uniformItemSizes">
      <bool>true</bool>
     </property>
     <property name="selectionRectVisible">
      <bool>true</bool>
     </property>
     <property name="sortingEnabled">
      <bool>true</bool>
     </property>
    </widget>
   </item>
  </layout>
 </widget>
 <resources/>
 <connections/>
</ui>

//one_pop_up.ui

<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
 <class>Form</class>
 <widget class="QWidget" name="Form">
  <property name="geometry">
   <rect>
    <x>0</x>
    <y>0</y>
    <width>373</width>
    <height>114</height>
   </rect>
  </property>
  <property name="font">
   <font>
    <family>Segoe UI</family>
    <pointsize>12</pointsize>
   </font>
  </property>
  <property name="windowTitle">
   <string>Form</string>
  </property>
  <property name="locale">
   <locale language="English" country="Germany"/>
  </property>
  <layout class="QVBoxLayout" name="verticalLayout">
   <item>
    <widget class="QFrame" name="frame">
     <property name="sizePolicy">
      <sizepolicy hsizetype="Expanding" vsizetype="Fixed">
       <horstretch>0</horstretch>
       <verstretch>0</verstretch>
      </sizepolicy>
     </property>
     <property name="minimumSize">
      <size>
       <width>0</width>
       <height>48</height>
      </size>
     </property>
     <property name="styleSheet">
      <string notr="true">font: 12pt &quot;Segoe UI&quot;;</string>
     </property>
     <property name="frameShape">
      <enum>QFrame::StyledPanel</enum>
     </property>
     <layout class="QHBoxLayout" name="horizontalLayout_2">
      <item>
       <widget class="QLabel" name="label_header">
        <property name="font">
         <font>
          <family>Segoe UI</family>
          <pointsize>12</pointsize>
          <weight>50</weight>
          <italic>false</italic>
          <bold>false</bold>
         </font>
        </property>
        <property name="styleSheet">
         <string notr="true"/>
        </property>
        <property name="text">
         <string>TextLabel</string>
        </property>
       </widget>
      </item>
      <item>
       <spacer name="horizontalSpacer_3">
        <property name="orientation">
         <enum>Qt::Horizontal</enum>
        </property>
        <property name="sizeHint" stdset="0">
         <size>
          <width>40</width>
          <height>20</height>
         </size>
        </property>
       </spacer>
      </item>
      <item>
       <widget class="QPushButton" name="pushButton_postpone">
        <property name="minimumSize">
         <size>
          <width>0</width>
          <height>0</height>
         </size>
        </property>
        <property name="text">
         <string>Postpone</string>
        </property>
        <property name="icon">
         <iconset>
          <normaloff>icons/alarm-clock-blue_24_24.png</normaloff>icons/alarm-clock-blue_24_24.png</iconset>
        </property>
        <property name="iconSize">
         <size>
          <width>16</width>
          <height>16</height>
         </size>
        </property>
        <property name="autoDefault">
         <bool>false</bool>
        </property>
        <property name="flat">
         <bool>true</bool>
        </property>
       </widget>
      </item>
      <item>
       <widget class="QPushButton" name="pushButton_close">
        <property name="sizePolicy">
         <sizepolicy hsizetype="Fixed" vsizetype="Fixed">
          <horstretch>0</horstretch>
          <verstretch>0</verstretch>
         </sizepolicy>
        </property>
        <property name="font">
         <font>
          <family>Segoe UI</family>
          <pointsize>12</pointsize>
          <weight>50</weight>
          <italic>false</italic>
          <bold>false</bold>
         </font>
        </property>
        <property name="text">
         <string>Close</string>
        </property>
        <property name="icon">
         <iconset>
          <normaloff>icons/prohibition.png</normaloff>icons/prohibition.png</iconset>
        </property>
        <property name="iconSize">
         <size>
          <width>16</width>
          <height>16</height>
         </size>
        </property>
        <property name="flat">
         <bool>true</bool>
        </property>
       </widget>
      </item>
     </layout>
    </widget>
   </item>
   <item>
    <widget class="QFrame" name="">
     <property name="sizePolicy">
      <sizepolicy hsizetype="Expanding" vsizetype="Minimum">
       <horstretch>0</horstretch>
       <verstretch>0</verstretch>
      </sizepolicy>
     </property>
     <layout class="QHBoxLayout" name="horizontalLayout">
      <item>
       <widget class="QLabel" name="label_23">
        <property name="text">
         <string>From</string>
        </property>
       </widget>
      </item>
      <item>
       <widget class="QTimeEdit" name="timeEdit">
        <property name="enabled">
         <bool>true</bool>
        </property>
        <property name="wrapping">
         <bool>false</bool>
        </property>
        <property name="frame">
         <bool>true</bool>
        </property>
        <property name="readOnly">
         <bool>true</bool>
        </property>
        <property name="buttonSymbols">
         <enum>QAbstractSpinBox::NoButtons</enum>
        </property>
        <property name="keyboardTracking">
         <bool>false</bool>
        </property>
       </widget>
      </item>
      <item>
       <spacer name="horizontalSpacer_2">
        <property name="orientation">
         <enum>Qt::Horizontal</enum>
        </property>
        <property name="sizeType">
         <enum>QSizePolicy::Fixed</enum>
        </property>
        <property name="sizeHint" stdset="0">
         <size>
          <width>5</width>
          <height>20</height>
         </size>
        </property>
       </spacer>
      </item>
      <item>
       <widget class="QLabel" name="label">
        <property name="text">
         <string>to</string>
        </property>
       </widget>
      </item>
      <item>
       <widget class="QTimeEdit" name="timeEdit_2">
        <property name="enabled">
         <bool>true</bool>
        </property>
        <property name="frame">
         <bool>true</bool>
        </property>
        <property name="readOnly">
         <bool>true</bool>
        </property>
        <property name="buttonSymbols">
         <enum>QAbstractSpinBox::NoButtons</enum>
        </property>
        <property name="keyboardTracking">
         <bool>false</bool>
        </property>
        <property name="showGroupSeparator" stdset="0">
         <bool>false</bool>
        </property>
       </widget>
      </item>
      <item>
       <spacer name="horizontalSpacer">
        <property name="orientation">
         <enum>Qt::Horizontal</enum>
        </property>
        <property name="sizeHint" stdset="0">
         <size>
          <width>40</width>
          <height>20</height>
         </size>
        </property>
       </spacer>
      </item>
      <item>
       <widget class="QPushButton" name="pushButton_add">
        <property name="sizePolicy">
         <sizepolicy hsizetype="Fixed" vsizetype="Fixed">
          <horstretch>0</horstretch>
          <verstretch>0</verstretch>
         </sizepolicy>
        </property>
        <property name="text">
         <string>Add</string>
        </property>
        <property name="icon">
         <iconset>
          <normaloff>icons/arrow-curve.png</normaloff>icons/arrow-curve.png</iconset>
        </property>
        <property name="iconSize">
         <size>
          <width>24</width>
          <height>24</height>
         </size>
        </property>
        <property name="flat">
         <bool>true</bool>
        </property>
       </widget>
      </item>
     </layout>
    </widget>
   </item>
   <item>
    <widget class="Line" name="line">
     <property name="orientation">
      <enum>Qt::Horizontal</enum>
     </property>
    </widget>
   </item>
  </layout>
 </widget>
 <resources/>
 <connections/>
</ui>

我必须做什么？

  1. 我必须区分是哪个按钮发出了信号。
    • 关闭（按钮“关闭”）
    • 采用 QListWidget 临时形式（'推迟'）
    • 从另一个类调用方法 MainWindow.add_record(#with the time period on this widgetItem) (button 'Add record')
  3. 我还必须在popupMain 按钮上执行推迟（按钮“全部推迟”）和全部关闭（按钮“全部关闭”）。但我什至不知道在一件物品上做些什么...... 附：我到处冲浪，但不知道该怎么做！

【问题讨论】：

    标签： python pyqt pyqt5


    【解决方案1】：

    我已经想出办法了。我使用了元组列表，即连接的 itemlistWidget 和 one_pop_up 实例。我还使用了基本的 takeItem。它完美地工作。 我使用 hide 来推迟项目。

    class onePopUp(QWidget):
    def __init__(self):
        counter = 0
        super(onePopUp, self).__init__(parent=None)
        loadUi('one_pop_up.ui', self)
        self.timeEdit.setTime(QTime.currentTime().addSecs(-15 * 60))
        self.timeEdit_2.setTime(QTime.currentTime())

        self.pushButton_postpone.clicked.connect(self.postpone_event)
        self.pushButton_close.clicked.connect(self.close_event)
        self.pushButton_add.clicked.connect(self.add_recordEvent)
    def postpone_event(self):
        print('in postpone_event at onePopUp')
        print(self.sender())
        print('_________out postpone_event at onePopUp')
        return self.sender()
    def close_event(self):
        print('onePopUp : close event')
        print('end_________onePopUp : close event')
        return self.sender()
    def add_recordEvent(self):
        print('in add_recordEvent at onePopUp')
        print(self.sender())
        print('_________out add_recordEvent at onePopUp')
        return self.sender()

class popupMain(QDialog):
    def __init__(self, main_window=None):
        super(popupMain, self).__init__(parent=None)
        loadUi('master_pop_up.ui', self)
        self.address_of_main_window = main_window
        self.list_of_tuples_item_widget = list()
        self.pushButton_show_main_window.clicked.connect(self.slot_show_main_window)
        self.pushButton_postpone_all.clicked.connect(self.slot_postpone_all)
        self.pushButton_add_extra_record.clicked.connect(self.slot_add_new)
        self.pushButton_close_all.clicked.connect(self.slot_close_all)
    def slot_show_main_window(self):
        self.hide()
    def slot_postpone_all(self):
        j = 0
        while j < self.listWidget.count():
            item_to_unhide = self.listWidget.item(j)
            print(item_to_unhide)
            item_to_unhide.setHidden(True)
            j += 1
    def slot_close_all(self):
        j = 0
        while j < self.listWidget.count():
            print(j, self.listWidget.count())
            item_to_unhide = self.listWidget.item(j)
            print(item_to_unhide)
            # if not item_to_unhide.isHidden:
            i = self.listWidget.takeItem(j)
            print('i={}'.format(i))
            # j += 1
    def slot_add_new(self):
        log('im in slot_add_new')
        self.hide()
        j = 0
        while j < self.listWidget.count():

            item_to_unhide = self.listWidget.item(j)
            print(item_to_unhide)
            if item_to_unhide.isHidden:
                item_to_unhide.setHidden(False)
            j += 1
        # Creating  a new list widget item whose parent is the listwidget itself
        # QListWidgetItem * listWidgetItem = new QListWidgetItem(ui->listWidget);
        list_widget_item = QListWidgetItem(self.listWidget)
        list_widget_item.setFlags(list_widget_item.flags() & ~Qt.ItemIsSelectable)
        # list_widget_item.setFlags(list_widget_item.flags() & ~Qt.ItemIsSelectable)
        # Adding the item to the listwidget
        # ui->listWidget->addItem(listWidgetItem);
        self.listWidget.addItem(list_widget_item)
        # Creating an object of the designed widget which is to be added to the listwidget
        # TheWidgetItem * theWidgetItem = new TheWidgetItem;
        inst_pop_up = onePopUp()
        # inst_pop_up.timeEdit.setTime(QTime.currentTime().addSecs(-15 * 60))
        # inst_pop_up.timeEdit_2.setTime(QTime.currentTime())
        inst_pop_up.pushButton_postpone.pressed.connect(self.button_postpone_pressed_slot)
        inst_pop_up.pushButton_close.clicked.connect(self.button_close_pressed_slot)
        inst_pop_up.pushButton_add.pressed.connect(self.button_add_pressed_slot)
        # Making sure that  the listWidgetItem has the same size as the TheWidgetItem
        # listWidgetItem->setSizeHint(theWidgetItem->sizeHint());
        list_widget_item.setSizeHint(inst_pop_up.frameSize())
        # print(inst_pop_up.dockWidget.testAttribute())
        inst_pop_up.label_header.setText('test')
        # Finally adding the itemWidget to  the list
        # ui->listWidget->setItemWidget(listWidgetItem, theWidgetItem);
        self.listWidget.setItemWidget(list_widget_item, inst_pop_up)
        self.list_of_tuples_item_widget.append((list_widget_item, inst_pop_up))
        print('list_widget_item, inst_pop_up = {}, {}'.format(list_widget_item, inst_pop_up))
        self.show()
    def button_postpone_pressed_slot(self):
        print('in button_postpone_pressed_slot at popupMain')
        item = None
        # print(self.sender())
        pointer_to_widget = self.sender().parent().parent()
        print(pointer_to_widget)
        for list_item in self.list_of_tuples_item_widget:
            if list_item[1] == pointer_to_widget:
                item = list_item[0]
        print('item is {}'.format(item))
        item.setHidden(True)
        print('_________out of button_postpone_pressed_slot at popupMain')
    def button_close_pressed_slot(self):
        print('in button_close_pressed_slot at popupMain')
        item = None
        # print(self.sender())
        pointer_to_widget = self.sender().parent().parent()
        print(pointer_to_widget)
        for list_item in self.list_of_tuples_item_widget:
            if list_item[1] == pointer_to_widget:
                item = list_item[0]
        print('item is {}'.format(item))
        row = self.listWidget.row(item)
        print('row={}'.format(row))
        i = self.listWidget.takeItem(row)
        print('i={}'.format(i))
        print('__________out of button_close_pressed_slot at popupMain')
    def button_add_pressed_slot(self):
        print('in button_add_pressed_slot at popupMain')
        onePopUp_instance = self.sender().parent().parent()
        print(onePopUp_instance)
        time_range_arg = dict(time_start=onePopUp_instance.timeEdit.time(),
                              time_end=onePopUp_instance.timeEdit_2.time())
        self.address_of_main_window.add_item_records(time_range=time_range_arg)
        print('_______out of button_add_pressed_slot at popupMain')

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