показать содержимое таба

В первом окне есть несколько табов, кнопка, чтобы открыть окно, где можно просмотреть их содержимое(слайд-шоу), в этом окне есть две кнопки: назад и вперед, чтобы листать табы. Как это реализовать? В моем коде уже можно добавлять текст и картинки к табам?

from PyQt5.QtWidgets import QWidget, QMainWindow, QFileDialog, QInputDialog, QLabel, QApplication
from PyQt5.QtGui import QImage, QPixmap
from PyQt5.QtCore import QRect
from PyQt5 import uic
import sys


class FirstForm(QMainWindow):
    def __init__(self):
        super().__init__()
        uic.loadUi('form1.ui', self)
        self.secondForm = SecondForm()
        self.slideshow = SlideShow()
        self.pushButton.clicked.connect(self.secondForm.show)
        self.secondForm.btn2_2.clicked.connect(self.addImage)
        self.secondForm.btn2.clicked.connect(self.addText)
        self.pushButton_2.clicked.connect(self.openshow)

    def getWidgetGeometry(self):
        try:
            x = int(self.secondForm.height_2.text())
            y = int(self.secondForm.lineEdit_2.text())
            w = int(self.secondForm.lineEdit_3.text())
            h = int(self.secondForm.lineEdit_4.text())
        except:
            x = 0
            y = 0
            w = 100
            h = 100
        return QRect(x, y, w, h)

    def openshow(self):
        self.slideshow.show()

    def addImage(self):
        result = QFileDialog.getOpenFileName(self.secondForm, 'Выбрать картинку', '')
        if result[1]:
            image = QImage(result[0])
            label = QLabel('', self.tabWidget.currentWidget())
            label.setPixmap(QPixmap.fromImage(image))
            label.setGeometry(self.getWidgetGeometry())
            label.show()

    def addText(self):
        result = QInputDialog.getText(self.secondForm, '', 'введите текст')
        if result[1]:
            label = QLabel(result[0], self.tabWidget.currentWidget())
            label.setGeometry(self.getWidgetGeometry())
            label.show()


class SecondForm(QWidget):
    def __init__(self):
        super().__init__()
        uic.loadUi('form2.ui', self)

class SlideShow(QWidget):
    def __init__(self):
        super().__init__()
        uic.loadUi('form3.ui', self)


if __name__ == '__main__':
    app = QApplication(sys.argv)
    ex = FirstForm()
    ex.show()
    sys.exit(app.exec_())

uic главного окна с табами:

<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
 <class>MainWindow</class>
 <widget class="QMainWindow" name="MainWindow">
  <property name="geometry">
   <rect>
    <x>0</x>
    <y>0</y>
    <width>800</width>
    <height>600</height>
   </rect>
  </property>
  <property name="windowTitle">
   <string>MainWindow</string>
  </property>
  <widget class="QWidget" name="centralwidget">
   <widget class="QTabWidget" name="tabWidget">
    <property name="geometry">
     <rect>
      <x>0</x>
      <y>0</y>
      <width>541</width>
      <height>471</height>
     </rect>
    </property>
    <widget class="QWidget" name="tab">
     <attribute name="title">
      <string>Tab 1</string>
     </attribute>
    </widget>
    <widget class="QWidget" name="tab_2">
     <attribute name="title">
      <string>Tab 2</string>
     </attribute>
    </widget>
   </widget>
   <widget class="QPushButton" name="pushButton">
    <property name="geometry">
     <rect>
      <x>60</x>
      <y>480</y>
      <width>181</width>
      <height>71</height>
     </rect>
    </property>
    <property name="text">
     <string>Открыть второе окно</string>
    </property>
   </widget>
   <widget class="QPushButton" name="pushButton_2">
    <property name="geometry">
     <rect>
      <x>270</x>
      <y>480</y>
      <width>211</width>
      <height>61</height>
     </rect>
    </property>
    <property name="text">
     <string>содержимое табов(слайд-шоу)</string>
    </property>
   </widget>
  </widget>
  <widget class="QMenuBar" name="menubar">
   <property name="geometry">
    <rect>
     <x>0</x>
     <y>0</y>
     <width>800</width>
     <height>21</height>
    </rect>
   </property>
  </widget>
  <widget class="QStatusBar" name="statusbar"/>
 </widget>
 <resources/>
 <connections/>
</ui>
uic редактора( здесь можно вставлять картинки и тексты в табы первого окна):
<?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>400</width>
    <height>300</height>
   </rect>
  </property>
  <property name="windowTitle">
   <string>Form</string>
  </property>
  <widget class="QPushButton" name="btn2">
   <property name="geometry">
    <rect>
     <x>50</x>
     <y>40</y>
     <width>101</width>
     <height>31</height>
    </rect>
   </property>
   <property name="text">
    <string>текст</string>
   </property>
  </widget>
  <widget class="QPushButton" name="btn2_2">
   <property name="geometry">
    <rect>
     <x>50</x>
     <y>130</y>
     <width>101</width>
     <height>31</height>
    </rect>
   </property>
   <property name="text">
    <string>картинка</string>
   </property>
  </widget>
  <widget class="QLabel" name="label">
   <property name="geometry">
    <rect>
     <x>190</x>
     <y>40</y>
     <width>61</width>
     <height>21</height>
    </rect>
   </property>
   <property name="text">
    <string>Положение</string>
   </property>
  </widget>
  <widget class="QLabel" name="label_2">
   <property name="geometry">
    <rect>
     <x>290</x>
     <y>40</y>
     <width>61</width>
     <height>21</height>
    </rect>
   </property>
   <property name="text">
    <string>Размеры</string>
   </property>
  </widget>
  <widget class="QLineEdit" name="lineEdit">
   <property name="geometry">
    <rect>
     <x>200</x>
     <y>70</y>
     <width>31</width>
     <height>20</height>
    </rect>
   </property>
  </widget>
  <widget class="QLineEdit" name="lineEdit_2">
   <property name="geometry">
    <rect>
     <x>200</x>
     <y>130</y>
     <width>31</width>
     <height>20</height>
    </rect>
   </property>
  </widget>
  <widget class="QLineEdit" name="lineEdit_3">
   <property name="geometry">
    <rect>
     <x>290</x>
     <y>70</y>
     <width>31</width>
     <height>20</height>
    </rect>
   </property>
  </widget>
  <widget class="QLineEdit" name="lineEdit_4">
   <property name="geometry">
    <rect>
     <x>290</x>
     <y>130</y>
     <width>31</width>
     <height>20</height>
    </rect>
   </property>
  </widget>
 </widget>
 <resources/>
 <connections/>
</ui>
uic третьего окна( здесь нужно реализовать показ содержимого табов первого окна):
<?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>622</width>
    <height>475</height>
   </rect>
  </property>
  <property name="windowTitle">
   <string>Form</string>
  </property>
  <widget class="QPushButton" name="pushButton">
   <property name="geometry">
    <rect>
     <x>10</x>
     <y>430</y>
     <width>91</width>
     <height>31</height>
    </rect>
   </property>
   <property name="text">
    <string>Назад</string>
   </property>
  </widget>
  <widget class="QPushButton" name="pushButton_2">
   <property name="geometry">
    <rect>
     <x>110</x>
     <y>430</y>
     <width>91</width>
     <height>31</height>
    </rect>
   </property>
   <property name="text">
    <string>Вперед</string>
   </property>
  </widget>
 </widget>
 <resources/>
 <connections/>
</ui>