Refactoring the project. Adding some improvements. Add QRangeSlider slider to set the scope of the podcast preview. Interface improvements to the podcast view. Update .gitignore.

.gitignore

@@ -54,7 +54,7 @@ cover/
 # Translations
 *.mo
 *.pot
-
+demuxer.txt
 # Django stuff:
 *.log
 local_settings.py

.idea/dictionaries/afar.xml

@@ -0,0 +1,3 @@
+<component name="ProjectDictionaryState">
+  <dictionary name="afar" />
+</component>

Pipfile

@@ -11,6 +11,7 @@ pylama = "*"
 ffmpeg = "*"
 pip = "*"
 ffmpeg-python = "*"
+pydub = "*"
 
 [dev-packages]
 

Pipfile.lock

@@ -1,7 +1,7 @@
 {
     "_meta": {
         "hash": {
-            "sha256": "6c12b28b456a859b8139dd5175876beeec58f47abcfbcb6d98dbfdc3a955320d"
+            "sha256": "b9153460b4a961fc9063b87ddac6e4c7bf8748bfaefcefc26f2401e340ae7b1e"
         },
         "pipfile-spec": 6,
         "requires": {
@@ -148,6 +148,14 @@
             "markers": "python_version >= '3.5'",
             "version": "==5.1.1"
         },
+        "pydub": {
+            "hashes": [
+                "sha256:25fdfbbfd4c69363006a27c7bd2346c4b886a0dd3da264c14d858b71a9593284",
+                "sha256:630c68bfff9bb27cbc5e1f02923f717c3bc5f4d73fd685fda08b6ce90f76dc69"
+            ],
+            "index": "pypi",
+            "version": "==0.24.1"
+        },
         "pyflakes": {
             "hashes": [
                 "sha256:0d94e0e05a19e57a99444b6ddcf9a6eb2e5c68d3ca1e98e90707af8152c90a92",

src/gui/ui/preview_dialog.ui

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <ui version="4.0">
- <class>dialog</class>
+ <class>PreviewDialog</class>
- <widget class="QDialog" name="dialog">
+ <widget class="QDialog" name="PreviewDialog">
   <property name="windowModality">
    <enum>Qt::NonModal</enum>
   </property>
@@ -18,85 +18,68 @@
   </property>
   <layout class="QVBoxLayout" name="verticalLayout">
    <item>
-    <layout class="QVBoxLayout" name="vertical_layout">
+    <layout class="QVBoxLayout" name="v_layout_1"/>
+   </item>
+   <item>
+    <widget class="Line" name="line_2">
+     <property name="orientation">
+      <enum>Qt::Horizontal</enum>
+     </property>
+    </widget>
+   </item>
+   <item>
+    <layout class="QHBoxLayout" name="h_layout_range_values">
      <item>
-      <widget class="QGraphicsView" name="graphics_view"/>
+      <widget class="QLabel" name="left_label">
-     </item>
+       <property name="text">
-     <item>
+        <string>Czas rozpoczęcia:</string>
-      <widget class="Line" name="line">
-       <property name="orientation">
-        <enum>Qt::Horizontal</enum>
        </property>
       </widget>
      </item>
      <item>
-      <widget class="QSlider" name="range_silder">
+      <widget class="QLineEdit" name="left_range"/>
-       <property name="orientation">
+     </item>
-        <enum>Qt::Horizontal</enum>
+     <item>
-       </property>
+      <widget class="QLabel" name="right_label">
-       <property name="tickPosition">
+       <property name="text">
-        <enum>QSlider::TicksBothSides</enum>
+        <string>Czas zakończenia:</string>
-       </property>
-       <property name="tickInterval">
-        <number>1</number>
        </property>
       </widget>
      </item>
      <item>
-      <widget class="Line" name="line_2">
+      <widget class="QLineEdit" name="right_range"/>
-       <property name="orientation">
+     </item>
-        <enum>Qt::Horizontal</enum>
+     <item>
+      <widget class="QPushButton" name="create_preview_button">
+       <property name="text">
+        <string>utwórz podgląd</string>
+       </property>
+      </widget>
+     </item>
+    </layout>
+   </item>
+   <item>
+    <widget class="Line" name="line">
+     <property name="orientation">
+      <enum>Qt::Horizontal</enum>
+     </property>
+    </widget>
+   </item>
+   <item>
+    <layout class="QHBoxLayout" name="horizontalLayout">
+     <item>
+      <widget class="QPushButton" name="play_button">
+       <property name="text">
+        <string>start</string>
        </property>
       </widget>
      </item>
      <item>
-      <layout class="QHBoxLayout" name="horizontal_layout_2">
+      <widget class="QPushButton" name="stop_button">
-       <item>
+       <property name="text">
-        <widget class="QLabel" name="label">
+        <string>stop</string>
-         <property name="text">
+       </property>
-          <string>Początek fragmentu</string>
+      </widget>
-         </property>
-        </widget>
-       </item>
-       <item>
-        <widget class="QLineEdit" name="line_edit"/>
-       </item>
-       <item>
-        <widget class="QLabel" name="label_2">
-         <property name="text">
-          <string>Koniec fragemntu</string>
-         </property>
-        </widget>
-       </item>
-       <item>
-        <widget class="QLineEdit" name="line_edit_2"/>
-       </item>
-      </layout>
-     </item>
-     <item>
-      <layout class="QHBoxLayout" name="horizontal_layout_3">
-       <item>
-        <widget class="QPushButton" name="push_button">
-         <property name="text">
-          <string>start</string>
-         </property>
-        </widget>
-       </item>
-       <item>
-        <widget class="QPushButton" name="push_button_2">
-         <property name="text">
-          <string>stop</string>
-         </property>
-        </widget>
-       </item>
-       <item>
-        <widget class="QPushButton" name="push_button_3">
-         <property name="text">
-          <string>zakończ</string>
-         </property>
-        </widget>
-       </item>
-      </layout>
      </item>
     </layout>
    </item>

src/python/classes/mainwindow.py

@@ -2,6 +2,8 @@ import os
 import shutil
 import subprocess
 import tempfile
+from pathlib import Path
+from pydub.utils import mediainfo
 
 # import resources_rc
 from PyQt5.QtCore import Qt
@@ -10,12 +12,18 @@ from PyQt5.QtWidgets import QMainWindow, QLabel, QFileDialog, QDialog, QDialogBu
 
 from src.python.classes.settings_dialog import SettingsDialog
 from src.python.ui.mainwindow_ui import Ui_MainWindow
+
 from src.python.classes.translate import Translator
+from src.python.classes.preview_dialog import PreviewDialog
 
 import generate_demuxer
 
 
 class MainWindow(QMainWindow, QApplication, Ui_MainWindow):
+    """
+        MainWindow Class
+    """
+
     def __init__(self, parent=None):
         super(MainWindow, self).__init__(parent=parent)
         self.translator = Translator()
@@ -29,9 +37,14 @@ class MainWindow(QMainWindow, QApplication, Ui_MainWindow):
         self.aresample = "8000"
         self.test_data()
 
+        self.image_extensions = ['.jpg', '.png']
+        self.audio_extensions = ['.mp3', '.wav']
+
     def setup_logic(self):
+        """Connect ui elements with methods."""
         self.action_settings.triggered.connect(self.open_setting_dialog)
         self.button_generate.clicked.connect(self.generate_video_podcast)
+        self.button_preview.clicked.connect(self.preview_video_podcast)
         self.button_audio_1.clicked.connect(lambda: self.open_audio_import(audio_number=1))
         self.button_audio_2.clicked.connect(lambda: self.open_audio_import(audio_number=2))
         self.button_select_avatar_1.clicked.connect(lambda: self.open_image_import(image_number=1))
@@ -42,6 +55,7 @@ class MainWindow(QMainWindow, QApplication, Ui_MainWindow):
         self.check_box_connected_channels.stateChanged.connect(self.channels_connected)
 
     def change_language(self):
+        """Retranslate user interface."""
         self.translator.load_lang(self.lang)
         self.retranslateUi(self.window())
 
@@ -49,25 +63,12 @@ class MainWindow(QMainWindow, QApplication, Ui_MainWindow):
         self.test_data()
 
     def setup_detail(self):
+        """TODO: add names to images"""
         self.line_edit_name_1.setDisabled(True)
         self.line_edit_name_2.setDisabled(True)
 
-    @staticmethod
-    def create_custom_dialog(title: str, msg: str):
-        dialog = QDialog()
-        label = QLabel()
-        label.setText(msg)
-        label.setObjectName('message_box')
-        buttons = QDialogButtonBox.Ok
-        button_box = QDialogButtonBox(buttons)
-        button_box.accepted.connect(dialog.accept)
-        layout = QVBoxLayout()
-        layout.addWidget(label)
-        layout.addWidget(button_box)
-        dialog.setLayout(layout)
-        return dialog
-
     def test_data(self):
+        """Test data."""
         self.line_edit_audio_1.setText('./src/sounds/oba_kanały.mp3')
         pixmap1 = QPixmap('./src/gui/images/both.png')
         scaled_pixmap1 = pixmap1.scaled(pixmap1.size(), Qt.KeepAspectRatio)
@@ -89,83 +90,122 @@ class MainWindow(QMainWindow, QApplication, Ui_MainWindow):
         self.preview_label_avatar_4.setPixmap(scaled_pixmap4)
         self.preview_label_avatar_4.setProperty('path', './src/gui/images/right.png')
 
-    def open_setting_dialog(self):
+    def check_file(self, file, extensions):
-        old_lang = self.lang
+        """Check file exist and have good extension."""
-        settings = SettingsDialog(parent=self)
-        settings.exec_()
-        if old_lang != self.lang:
-            print(old_lang, self.lang)
-            self.change_language()
-
-    def open_image_import(self, image_number: int):
-        dialog = QFileDialog()
-        dialog.setOption(dialog.DontUseNativeDialog, True)
-        dialog.setFileMode(QFileDialog.ExistingFile)
-        file_formats = "All Files (*);;JPG (*.jpg);;PNG (*.png)"
-        file, _ = dialog.getOpenFileName(self, "QFileDialog.getOpenFileName()", "", file_formats, options=dialog.options())
-        if not file:
-            title = 'Ostrzeżenie'
-            msg = "[!] Nie wybrano żadnego pliku."
-            dialog = self.create_custom_dialog(title=title, msg=msg)
-            dialog.exec_()
-
-        if file and not file.lower().endswith('.jpg') and not file.lower().endswith('.png'):
-            title = 'Błąd'
-            msg = F"[!] Plik {file} nie jest plikiem jpg/png."
-            dialog = self.create_custom_dialog(title=title, msg=msg)
-            dialog.exec_()
-
-        else:
-            if file:
-                pixmap = QPixmap(file)
-
-                scaled_pixmap = pixmap.scaled(pixmap.size(), Qt.KeepAspectRatio)
-
-                if image_number == 1:
-                    self.preview_label_avatar_1.setProperty('path', file)
-                    self.preview_label_avatar_1.setPixmap(scaled_pixmap)
-
-                elif image_number == 2:
-                    self.preview_label_avatar_2.setProperty('path', file)
-                    self.preview_label_avatar_2.setPixmap(scaled_pixmap)
-
-                elif image_number == 3:
-                    self.preview_label_avatar_3.setProperty('path', file)
-                    self.preview_label_avatar_3.setPixmap(scaled_pixmap)
-
-                elif image_number == 4:
-                    self.preview_label_avatar_4.setProperty('path', file)
-                    self.preview_label_avatar_4.setPixmap(scaled_pixmap)
-
-                print(F"[*] Zaimportowano garfikę {image_number} z pliku: '{file}'.")
-                print(F"[*] Rodzielczość grafiki: {pixmap.width()}x{pixmap.height()}")
-
-    def open_audio_import(self, audio_number: int):
-        dialog = QFileDialog()
-        dialog.setOption(dialog.DontUseNativeDialog, True)
-        dialog.setFileMode(QFileDialog.ExistingFile)
-        file_formats = "All Files (*);;mp3 (*.mp3);;wav (*.wav)"
-        file, _ = dialog.getOpenFileName(self, "QFileDialog.getOpenFileName()", "", file_formats, options=dialog.options())
         if not file:
             msg = "[!] Nie wybrano żadnego pliku."
             dialog = self.create_custom_dialog(title='Ostrzeżenie', msg=msg)
             dialog.exec_()
+            return False
 
-        elif not file.lower().endswith('.mp3') and not file.lower().endswith('.wav'):
+        elif not Path(file).is_file():
-            msg = F"[!] Plik {file} nie jest plikiem mp3/wav."
+            msg = f"[!] Wybrany plik: {file} - nie istnieje."
-            dialog = self.create_custom_dialog(title='Błąd', msg=msg)
+            dialog = self.create_custom_dialog(title='Ostrzeżenie', msg=msg)
             dialog.exec_()
+            return False
 
+        elif not any(file.lower().endswith(x) for x in extensions):
+            dialog = self.create_custom_dialog(
+                title='Błąd',
+                msg=F"[!] Wybrany plik: {file.rsplit('/')[-1]} - nie jest plikiem o rozszerzeniu {extensions}.")
+            dialog.exec_()
+            return False
+
+        return True
+
+    def create_custom_dialog(self, title: str, msg: str):
+        """Create custom dialog."""
+        dialog = QDialog(parent=self)
+        dialog.setWindowTitle(title)
+        label = QLabel()
+        label.setText(msg)
+        label.setObjectName('message_box')
+        buttons = QDialogButtonBox.Ok
+        button_box = QDialogButtonBox(buttons)
+        button_box.accepted.connect(dialog.accept)
+        layout = QVBoxLayout()
+        layout.addWidget(label)
+        layout.addWidget(button_box)
+        dialog.setLayout(layout)
+        return dialog
+
+    def open_image_import(self, image_number: int):
+        """"Import images."""
+        dialog: QFileDialog = QFileDialog()
+        dialog.setOption(dialog.DontUseNativeDialog, False)
+        dialog.setFileMode(QFileDialog.ExistingFile)
+
+        title = f"Import image file {image_number}:"
+
+        # TODO: dynamic create formats filter based on list self.image_extensions
+        formats_filter = "All Files (*);;JPG (*.jpg);;PNG (*.png)"
+
+        file, _ = dialog.getOpenFileName(
+            self, caption=title, filter=formats_filter, options=dialog.options()
+        )
+
+        if not self.check_file(file, self.image_extensions):
+            return -1
+        else:
+            pixmap = QPixmap(file)
+            scaled_pixmap = pixmap.scaled(pixmap.size(), Qt.KeepAspectRatio)
+
+            if image_number == 1:
+                self.preview_label_avatar_1.setProperty('path', file)
+                self.preview_label_avatar_1.setPixmap(scaled_pixmap)
+
+            elif image_number == 2:
+                self.preview_label_avatar_2.setProperty('path', file)
+                self.preview_label_avatar_2.setPixmap(scaled_pixmap)
+
+            elif image_number == 3:
+                self.preview_label_avatar_3.setProperty('path', file)
+                self.preview_label_avatar_3.setPixmap(scaled_pixmap)
+
+            elif image_number == 4:
+                self.preview_label_avatar_4.setProperty('path', file)
+                self.preview_label_avatar_4.setPixmap(scaled_pixmap)
+
+            print(F"[*] Zaimportowano garfikę {image_number} z pliku: '{file}'.")
+            print(F"[*] Rodzielczość grafiki: {pixmap.width()}x{pixmap.height()}")
+
+    def open_audio_import(self, audio_number: int):
+        """Method to import audio."""
+        dialog = QFileDialog()
+        dialog.setOption(dialog.DontUseNativeDialog, True)
+        dialog.setFileMode(QFileDialog.ExistingFile)
+        file_formats = "All Files (*);;mp3 (*.mp3);;wav (*.wav)"
+        title = f"Import audio file {audio_number}:"
+        file, _ = dialog.getOpenFileName(
+            self, caption=title, filter=file_formats, options=dialog.options()
+        )
+        if not self.check_file(file, self.audio_extensions):
+            return -1
         else:
             if audio_number == 1:
                 self.line_edit_audio_1.setText(file)
-
+                self.line_edit_audio_1.setProperty('duration', mediainfo(file)['duration'])
+                print(f"[*] Audio 1: {file} duration: {mediainfo(file)['duration']}")
             elif audio_number == 2:
                 self.line_edit_audio_2.setText(file)
+                self.line_edit_audio_2.setProperty('duration', mediainfo(file)['duration'])
+                print(f"[*] Audio 2: {file} duration: {mediainfo(file)['duration']}")
 
             print(F"[*] Zaimportowano ścieżkę {audio_number} pliku: '{file}'.")
 
+    def open_setting_dialog(self):
+        """Open settings dialog."""
+        old_lang = self.lang
+        settings = SettingsDialog(parent=self)
+        settings.exec_()
+
+        if old_lang != self.lang:
+            print(old_lang, self.lang)
+            self.change_language()
+        return True
+
     def channels_connected(self, checked):
+        """Change information id channels connected."""
         print(checked)
         if checked:
             self.button_audio_2.setDisabled(True)
@@ -177,10 +217,15 @@ class MainWindow(QMainWindow, QApplication, Ui_MainWindow):
             self.line_edit_audio_2.setDisabled(False)
             self.line_edit_audio_1.setPlaceholderText("Plik audio 1 rozmówcy")
 
-    def generate_video_podcast(self):
+    def preview_video_podcast(self):
-        # TODO: Change to pure python
+        """Preview Video Podcast"""
+        preview_dialog = PreviewDialog(parent=self)
+        preview_dialog.exec_()
+
+    def generate_video_podcast(self, start=None, end=None):
         """Generate podcast based on values from UI."""
         connected_channels = self.check_box_connected_channels.isChecked()
+
         # Setup images
         image_files = {
             'both': self.preview_label_avatar_1.property('path'),
@@ -188,7 +233,12 @@ class MainWindow(QMainWindow, QApplication, Ui_MainWindow):
             'left': self.preview_label_avatar_3.property('path'),
             'right': self.preview_label_avatar_4.property('path')
         }
+
         audio_files = []
+        for image_path in image_files.values():
+            if not self.check_file(image_path, self.image_extensions):
+                    self.create_custom_dialog(title='Błąd!', msg=f"Tworzenie podcastu zostało przerwane.")
+                    return -1
 
         if not connected_channels:
             audio_files.append({'file': self.line_edit_audio_1.text()})
@@ -197,6 +247,12 @@ class MainWindow(QMainWindow, QApplication, Ui_MainWindow):
         else:
             audio_files.append({'file': self.line_edit_audio_1.text()})
 
+        for audio_path in audio_files:
+            if not Path(audio_path['file']).is_file():
+                if not self.check_file(audio_path['file'], self.audio_extensions):
+                    self.create_custom_dialog(title='Błąd!', msg=f"Tworzenie podcastu zostało przerwane.")
+                    return -1
+
         # Split name and extension of the file
         for dictionary in audio_files:
             dictionary['ext'] = dictionary['file'].rsplit('.')[-1]

src/python/classes/preview_dialog.py

@@ -0,0 +1,72 @@
+from PyQt5.QtMultimedia import QMediaPlayer
+from PyQt5.QtMultimediaWidgets import QVideoWidget
+
+
+from src.python.classes.range_slider import QRangeSlider
+from src.python.ui.preview_dialog_ui import Ui_PreviewDialog
+from PyQt5.QtWidgets import QDialog, QLabel, QStyle
+
+
+class PreviewDialog(QDialog, Ui_PreviewDialog):
+    """
+        Dialog to show preview of podcast.
+    """
+    def __init__(self, parent=None, start_time=0, end_time=15):
+        super(PreviewDialog, self).__init__(parent=parent)
+        self.setupUi(self)
+        self.mediaPlayer = QMediaPlayer(parent=self, flags=QMediaPlayer.VideoSurface)
+
+        self.video_widget = QVideoWidget()
+        self.range_slider = QRangeSlider()
+        self.v_layout_1.addWidget(self.video_widget)
+        self.v_layout_1.addWidget(self.range_slider)
+
+        self.range_slider.setRange(start=int(start_time), end=int(end_time))
+
+    def setup_video_logic(self):
+        """
+            Setup connections to events
+        """
+        self.mediaPlayer.setVideoOutput(self.video_widget)
+        self.mediaPlayer.stateChanged.connect(self.media_state_changed)
+        self.mediaPlayer.positionChanged.connect(self.position_changed)
+        self.mediaPlayer.durationChanged.connect(self.duration_changed)
+        self.create_preview_button.connect(self.generate_podcast_preview)
+
+    def media_state_changed(self, state):
+        """
+
+        :param state:
+        """
+        if self.mediaPlayer.state() == QMediaPlayer.PlayingState:
+            self.playButton.setIcon(
+                self.style().standardIcon(QStyle.SP_MediaPause))
+        else:
+            self.playButton.setIcon(
+                self.style().standardIcon(QStyle.SP_MediaPlay))
+
+    def position_changed(self):
+        """
+            Position Changed
+        """
+        if self.mediaPlayer.state() == QMediaPlayer.PlayingState:
+            self.mediaPlayer.pause()
+        else:
+            self.mediaPlayer.play()
+
+    def play(self):
+        """
+            Play
+        """
+        if self.mediaPlayer.state() == QMediaPlayer.PlayingState:
+            self.mediaPlayer.pause()
+        else:
+            self.mediaPlayer.play()
+
+    def duration_changed(self, duration):
+        """
+
+        :param duration:
+        :return:
+        """
+        self.positionSlider.setRange(0, duration)

src/python/classes/range_slider.py

@@ -0,0 +1,150 @@
+from PyQt5.QtWidgets import *
+from PyQt5.QtCore import *
+from PyQt5.QtGui import *
+
+
+class QRangeSlider(QAbstractSlider):
+    """
+        QRangeSlider
+    """
+    def __init__(self, parent=None):
+        super().__init__(parent)
+
+        self.first_position = 1
+        self.second_position = 8
+
+        self.opt = QStyleOptionSlider()
+        self.opt.minimum = 0
+        self.opt.maximum = 100
+
+        self.setTickPosition(QSlider.TicksAbove)
+        self.setTickInterval(1)
+
+        self.setSizePolicy(
+            QSizePolicy(QSizePolicy.Expanding, QSizePolicy.Fixed, QSizePolicy.Slider)
+        )
+
+    def setRangeLimit(self, minimum: int, maximum: int):
+        self.opt.minimum = minimum
+        self.opt.maximum = maximum
+
+    def setRange(self, start: int, end: int):
+        self.first_position = start
+        self.second_position = end
+
+    def getRange(self):
+        return self.first_position, self.second_position
+
+    def setTickPosition(self, position: QSlider.TickPosition):
+        self.opt.tickPosition = position
+
+    def setTickInterval(self, ti: int):
+        self.opt.tickInterval = ti
+
+    def paintEvent(self, event: QPaintEvent):
+
+        painter = QPainter(self)
+
+        # Draw rule
+        self.opt.initFrom(self)
+        self.opt.rect = self.rect()
+        self.opt.sliderPosition = 0
+        self.opt.subControls = QStyle.SC_SliderGroove | QStyle.SC_SliderTickmarks
+
+        #   Draw GROOVE
+        self.style().drawComplexControl(QStyle.CC_Slider, self.opt, painter)
+
+        #  Draw INTERVAL
+
+        color = self.palette().color(QPalette.Highlight)
+        color.setAlpha(160)
+        painter.setBrush(QBrush(color))
+        painter.setPen(Qt.NoPen)
+
+        self.opt.sliderPosition = self.first_position
+        x_left_handle = (
+            self.style()
+            .subControlRect(QStyle.CC_Slider, self.opt, QStyle.SC_SliderHandle)
+            .right()
+        )
+
+        self.opt.sliderPosition = self.second_position
+        x_right_handle = (
+            self.style()
+            .subControlRect(QStyle.CC_Slider, self.opt, QStyle.SC_SliderHandle)
+            .left()
+        )
+
+        groove_rect = self.style().subControlRect(
+            QStyle.CC_Slider, self.opt, QStyle.SC_SliderGroove
+        )
+
+        selection = QRect(
+            x_left_handle,
+            groove_rect.y(),
+            x_right_handle - x_left_handle,
+            groove_rect.height(),
+        ).adjusted(-1, 1, 1, -1)
+
+        painter.drawRect(selection)
+
+        # Draw first handle
+
+        self.opt.subControls = QStyle.SC_SliderHandle
+        self.opt.sliderPosition = self.first_position
+        self.style().drawComplexControl(QStyle.CC_Slider, self.opt, painter)
+
+        # Draw second handle
+        self.opt.sliderPosition = self.second_position
+        self.style().drawComplexControl(QStyle.CC_Slider, self.opt, painter)
+
+    def mousePressEvent(self, event: QMouseEvent):
+
+        self.opt.sliderPosition = self.first_position
+        self._first_sc = self.style().hitTestComplexControl(
+            QStyle.CC_Slider, self.opt, event.pos(), self
+        )
+
+        self.opt.sliderPosition = self.second_position
+        self._second_sc = self.style().hitTestComplexControl(
+            QStyle.CC_Slider, self.opt, event.pos(), self
+        )
+
+    def mouseMoveEvent(self, event: QMouseEvent):
+
+        distance = self.opt.maximum - self.opt.minimum
+
+        pos = self.style().sliderValueFromPosition(
+            0, distance, event.pos().x(), self.rect().width()
+        )
+
+        if self._first_sc == QStyle.SC_SliderHandle:
+            if pos <= self.second_position:
+                self.first_position = pos
+                self.update()
+                return
+
+        if self._second_sc == QStyle.SC_SliderHandle:
+            if pos >= self.first_position:
+                self.second_position = pos
+                self.update()
+
+    def sizeHint(self):
+        """ override """
+        SliderLength = 84
+        TickSpace = 5
+
+        w = SliderLength
+        h = self.style().pixelMetric(QStyle.PM_SliderThickness, self.opt, self)
+
+        if (
+            self.opt.tickPosition & QSlider.TicksAbove
+            or self.opt.tickPosition & QSlider.TicksBelow
+        ):
+            h += TickSpace
+
+        return (
+            self.style()
+            .sizeFromContents(QStyle.CT_Slider, self.opt, QSize(w, h), self)
+            .expandedTo(QApplication.globalStrut())
+        )

src/python/ui/preview_dialog_ui.py

@@ -11,81 +11,72 @@
 from PyQt5 import QtCore, QtGui, QtWidgets
 
 
-class Ui_dialog(object):
+class Ui_PreviewDialog(object):
-    def setupUi(self, dialog):
+    def setupUi(self, PreviewDialog):
-        dialog.setObjectName("dialog")
+        PreviewDialog.setObjectName("PreviewDialog")
-        dialog.setWindowModality(QtCore.Qt.NonModal)
+        PreviewDialog.setWindowModality(QtCore.Qt.NonModal)
-        dialog.resize(782, 356)
+        PreviewDialog.resize(782, 356)
-        self.verticalLayout = QtWidgets.QVBoxLayout(dialog)
+        self.verticalLayout = QtWidgets.QVBoxLayout(PreviewDialog)
         self.verticalLayout.setObjectName("verticalLayout")
-        self.vertical_layout = QtWidgets.QVBoxLayout()
+        self.v_layout_1 = QtWidgets.QVBoxLayout()
-        self.vertical_layout.setObjectName("vertical_layout")
+        self.v_layout_1.setObjectName("v_layout_1")
-        self.graphics_view = QtWidgets.QGraphicsView(dialog)
+        self.verticalLayout.addLayout(self.v_layout_1)
-        self.graphics_view.setObjectName("graphics_view")
+        self.line_2 = QtWidgets.QFrame(PreviewDialog)
-        self.vertical_layout.addWidget(self.graphics_view)
-        self.line = QtWidgets.QFrame(dialog)
-        self.line.setFrameShape(QtWidgets.QFrame.HLine)
-        self.line.setFrameShadow(QtWidgets.QFrame.Sunken)
-        self.line.setObjectName("line")
-        self.vertical_layout.addWidget(self.line)
-        self.range_silder = QtWidgets.QSlider(dialog)
-        self.range_silder.setOrientation(QtCore.Qt.Horizontal)
-        self.range_silder.setTickPosition(QtWidgets.QSlider.TicksBothSides)
-        self.range_silder.setTickInterval(1)
-        self.range_silder.setObjectName("range_silder")
-        self.vertical_layout.addWidget(self.range_silder)
-        self.line_2 = QtWidgets.QFrame(dialog)
         self.line_2.setFrameShape(QtWidgets.QFrame.HLine)
         self.line_2.setFrameShadow(QtWidgets.QFrame.Sunken)
         self.line_2.setObjectName("line_2")
-        self.vertical_layout.addWidget(self.line_2)
+        self.verticalLayout.addWidget(self.line_2)
-        self.horizontal_layout_2 = QtWidgets.QHBoxLayout()
+        self.h_layout_range_values = QtWidgets.QHBoxLayout()
-        self.horizontal_layout_2.setObjectName("horizontal_layout_2")
+        self.h_layout_range_values.setObjectName("h_layout_range_values")
-        self.label = QtWidgets.QLabel(dialog)
+        self.left_label = QtWidgets.QLabel(PreviewDialog)
-        self.label.setObjectName("label")
+        self.left_label.setObjectName("left_label")
-        self.horizontal_layout_2.addWidget(self.label)
+        self.h_layout_range_values.addWidget(self.left_label)
-        self.line_edit = QtWidgets.QLineEdit(dialog)
+        self.left_range = QtWidgets.QLineEdit(PreviewDialog)
-        self.line_edit.setObjectName("line_edit")
+        self.left_range.setObjectName("left_range")
-        self.horizontal_layout_2.addWidget(self.line_edit)
+        self.h_layout_range_values.addWidget(self.left_range)
-        self.label_2 = QtWidgets.QLabel(dialog)
+        self.right_label = QtWidgets.QLabel(PreviewDialog)
-        self.label_2.setObjectName("label_2")
+        self.right_label.setObjectName("right_label")
-        self.horizontal_layout_2.addWidget(self.label_2)
+        self.h_layout_range_values.addWidget(self.right_label)
-        self.line_edit_2 = QtWidgets.QLineEdit(dialog)
+        self.right_range = QtWidgets.QLineEdit(PreviewDialog)
-        self.line_edit_2.setObjectName("line_edit_2")
+        self.right_range.setObjectName("right_range")
-        self.horizontal_layout_2.addWidget(self.line_edit_2)
+        self.h_layout_range_values.addWidget(self.right_range)
-        self.vertical_layout.addLayout(self.horizontal_layout_2)
+        self.create_preview_button = QtWidgets.QPushButton(PreviewDialog)
-        self.horizontal_layout_3 = QtWidgets.QHBoxLayout()
+        self.create_preview_button.setObjectName("create_preview_button")
-        self.horizontal_layout_3.setObjectName("horizontal_layout_3")
+        self.h_layout_range_values.addWidget(self.create_preview_button)
-        self.push_button = QtWidgets.QPushButton(dialog)
+        self.verticalLayout.addLayout(self.h_layout_range_values)
-        self.push_button.setObjectName("push_button")
+        self.line = QtWidgets.QFrame(PreviewDialog)
-        self.horizontal_layout_3.addWidget(self.push_button)
+        self.line.setFrameShape(QtWidgets.QFrame.HLine)
-        self.push_button_2 = QtWidgets.QPushButton(dialog)
+        self.line.setFrameShadow(QtWidgets.QFrame.Sunken)
-        self.push_button_2.setObjectName("push_button_2")
+        self.line.setObjectName("line")
-        self.horizontal_layout_3.addWidget(self.push_button_2)
+        self.verticalLayout.addWidget(self.line)
-        self.push_button_3 = QtWidgets.QPushButton(dialog)
+        self.horizontalLayout = QtWidgets.QHBoxLayout()
-        self.push_button_3.setObjectName("push_button_3")
+        self.horizontalLayout.setObjectName("horizontalLayout")
-        self.horizontal_layout_3.addWidget(self.push_button_3)
+        self.play_button = QtWidgets.QPushButton(PreviewDialog)
-        self.vertical_layout.addLayout(self.horizontal_layout_3)
+        self.play_button.setObjectName("play_button")
-        self.verticalLayout.addLayout(self.vertical_layout)
+        self.horizontalLayout.addWidget(self.play_button)
+        self.stop_button = QtWidgets.QPushButton(PreviewDialog)
+        self.stop_button.setObjectName("stop_button")
+        self.horizontalLayout.addWidget(self.stop_button)
+        self.verticalLayout.addLayout(self.horizontalLayout)
 
-        self.retranslateUi(dialog)
+        self.retranslateUi(PreviewDialog)
-        QtCore.QMetaObject.connectSlotsByName(dialog)
+        QtCore.QMetaObject.connectSlotsByName(PreviewDialog)
 
-    def retranslateUi(self, dialog):
+    def retranslateUi(self, PreviewDialog):
         _translate = QtCore.QCoreApplication.translate
-        dialog.setWindowTitle(_translate("dialog", "Dialog"))
+        PreviewDialog.setWindowTitle(_translate("PreviewDialog", "Dialog"))
-        self.label.setText(_translate("dialog", "Początek fragmentu"))
+        self.left_label.setText(_translate("PreviewDialog", "Czas rozpoczęcia:"))
-        self.label_2.setText(_translate("dialog", "Koniec fragemntu"))
+        self.right_label.setText(_translate("PreviewDialog", "Czas zakończenia:"))
-        self.push_button.setText(_translate("dialog", "start"))
+        self.create_preview_button.setText(_translate("PreviewDialog", "utwórz podgląd"))
-        self.push_button_2.setText(_translate("dialog", "stop"))
+        self.play_button.setText(_translate("PreviewDialog", "start"))
-        self.push_button_3.setText(_translate("dialog", "zakończ"))
+        self.stop_button.setText(_translate("PreviewDialog", "stop"))
 
 
 if __name__ == "__main__":
     import sys
     app = QtWidgets.QApplication(sys.argv)
-    dialog = QtWidgets.QDialog()
+    PreviewDialog = QtWidgets.QDialog()
-    ui = Ui_dialog()
+    ui = Ui_PreviewDialog()
-    ui.setupUi(dialog)
+    ui.setupUi(PreviewDialog)
-    dialog.show()
+    PreviewDialog.show()
     sys.exit(app.exec_())