Undo feature

1 files changed, 1037 insertions, 0 deletions

diff --git a/src/gui/mainwindow.py b/src/gui/mainwindow.py
new file mode 100644
index 0000000..81c5d7c
--- /dev/null
+++ b/src/gui/mainwindow.py
@@ -0,0 +1,1037 @@
+'''
+    When using GUI mode, this module's object (the main window) takes
+    user input to construct a program state (stored in the Core object).
+    This shows a preview of the video being created and allows for saving
+    projects and exporting the video at a later time.
+'''
+from PyQt5 import QtCore, QtGui, uic, QtWidgets
+from PyQt5.QtWidgets import QMenu, QShortcut
+from PIL import Image
+from queue import Queue
+import sys
+import os
+import signal
+import atexit
+import filecmp
+import time
+import logging
+
+from core import Core
+import gui.preview_thread as preview_thread
+from gui.preview_win import PreviewWindow
+from gui.presetmanager import PresetManager
+from gui.actions import *
+from toolkit import (
+    disableWhenEncoding, disableWhenOpeningProject, checkOutput, blockSignals
+)
+
+
+log = logging.getLogger('AVP.Gui.MainWindow')
+
+
+class MainWindow(QtWidgets.QMainWindow):
+    '''
+        The MainWindow wraps many Core methods in order to update the GUI
+        accordingly. E.g., instead of self.core.openProject(), it will use
+        self.openProject() and update the window titlebar within the wrapper.
+
+        MainWindow manages the autosave feature, although Core has the
+        primary functions for opening and creating project files.
+    '''
+
+    createVideo = QtCore.pyqtSignal()
+    newTask = QtCore.pyqtSignal(list)  # for the preview window
+    processTask = QtCore.pyqtSignal()
+
+    def __init__(self, window, project):
+        QtWidgets.QMainWindow.__init__(self)
+        log.debug(
+            'Main thread id: {}'.format(int(QtCore.QThread.currentThreadId())))
+        self.window = window
+        self.core = Core()
+        Core.mode = 'GUI'
+        # widgets of component settings
+        self.pages = []
+        self.lastAutosave = time.time()
+        # list of previous five autosave times, used to reduce update spam
+        self.autosaveTimes = []
+        self.autosaveCooldown = 0.2
+        self.encoding = False
+
+        # Find settings created by Core object
+        self.dataDir = Core.dataDir
+        self.presetDir = Core.presetDir
+        self.autosavePath = os.path.join(self.dataDir, 'autosave.avp')
+        self.settings = Core.settings
+
+        # Register clean-up functions
+        signal.signal(signal.SIGINT, self.terminate)
+        atexit.register(self.cleanUp)
+
+        # Create stack of undoable user actions
+        self.undoStack = QtWidgets.QUndoStack(self)
+        undoLimit = self.settings.value("pref_undoLimit")
+        self.undoStack.setUndoLimit(undoLimit)
+
+        # Create Preset Manager
+        self.presetManager = PresetManager(
+            uic.loadUi(
+                os.path.join(Core.wd, 'gui', 'presetmanager.ui')), self)
+
+        # Create the preview window and its thread, queues, and timers
+        log.debug('Creating preview window')
+        self.previewWindow = PreviewWindow(self, os.path.join(
+            Core.wd, 'gui', "background.png"))
+        window.verticalLayout_previewWrapper.addWidget(self.previewWindow)
+
+        log.debug('Starting preview thread')
+        self.previewQueue = Queue()
+        self.previewThread = QtCore.QThread(self)
+        self.previewWorker = preview_thread.Worker(self, self.previewQueue)
+        self.previewWorker.error.connect(self.previewWindow.threadError)
+        self.previewWorker.moveToThread(self.previewThread)
+        self.previewWorker.imageCreated.connect(self.showPreviewImage)
+        self.previewThread.start()
+        self.previewThread.finished.connect(
+            lambda:
+                log.critical('PREVIEW THREAD DIED! This should never happen.')
+        )
+
+        timeout = 500
+        log.debug(
+            'Preview timer set to trigger when idle for %sms' % str(timeout)
+        )
+        self.timer = QtCore.QTimer(self)
+        self.timer.timeout.connect(self.processTask.emit)
+        self.timer.start(timeout)
+
+        # Begin decorating the window and connecting events
+        componentList = self.window.listWidget_componentList
+
+        style = window.pushButton_undo.style()
+        undoButton = window.pushButton_undo
+        undoButton.setIcon(
+            style.standardIcon(QtWidgets.QStyle.SP_FileDialogBack)
+        )
+        undoButton.clicked.connect(self.undoStack.undo)
+        undoButton.setEnabled(False)
+        self.undoStack.cleanChanged.connect(
+            lambda change: undoButton.setEnabled(self.undoStack.count())
+        )
+        self.undoMenu = QMenu()
+        self.undoMenu.addAction(
+            self.undoStack.createUndoAction(self)
+        )
+        self.undoMenu.addAction(
+            self.undoStack.createRedoAction(self)
+        )
+        action = self.undoMenu.addAction('Show History...')
+        action.triggered.connect(
+            lambda _: self.showUndoStack()
+        )
+        undoButton.setMenu(self.undoMenu)
+
+        style = window.pushButton_listMoveUp.style()
+        window.pushButton_listMoveUp.setIcon(
+            style.standardIcon(QtWidgets.QStyle.SP_ArrowUp)
+        )
+        style = window.pushButton_listMoveDown.style()
+        window.pushButton_listMoveDown.setIcon(
+            style.standardIcon(QtWidgets.QStyle.SP_ArrowDown)
+        )
+        style = window.pushButton_removeComponent.style()
+        window.pushButton_removeComponent.setIcon(
+            style.standardIcon(QtWidgets.QStyle.SP_DialogDiscardButton)
+        )
+
+        if sys.platform == 'darwin':
+            log.debug(
+                'Darwin detected: showing progress label below progress bar')
+            window.progressBar_createVideo.setTextVisible(False)
+        else:
+            window.progressLabel.setHidden(True)
+
+        window.toolButton_selectAudioFile.clicked.connect(
+            self.openInputFileDialog)
+
+        window.toolButton_selectOutputFile.clicked.connect(
+            self.openOutputFileDialog)
+
+        def changedField():
+            self.autosave()
+            self.updateWindowTitle()
+
+        window.lineEdit_audioFile.textChanged.connect(changedField)
+        window.lineEdit_outputFile.textChanged.connect(changedField)
+
+        window.progressBar_createVideo.setValue(0)
+
+        window.pushButton_createVideo.clicked.connect(
+            self.createAudioVisualisation)
+
+        window.pushButton_Cancel.clicked.connect(self.stopVideo)
+
+        for i, container in enumerate(Core.encoderOptions['containers']):
+            window.comboBox_videoContainer.addItem(container['name'])
+            if container['name'] == self.settings.value('outputContainer'):
+                selectedContainer = i
+
+        window.comboBox_videoContainer.setCurrentIndex(selectedContainer)
+        window.comboBox_videoContainer.currentIndexChanged.connect(
+            self.updateCodecs
+        )
+
+        self.updateCodecs()
+
+        for i in range(window.comboBox_videoCodec.count()):
+            codec = window.comboBox_videoCodec.itemText(i)
+            if codec == self.settings.value('outputVideoCodec'):
+                window.comboBox_videoCodec.setCurrentIndex(i)
+
+        for i in range(window.comboBox_audioCodec.count()):
+            codec = window.comboBox_audioCodec.itemText(i)
+            if codec == self.settings.value('outputAudioCodec'):
+                window.comboBox_audioCodec.setCurrentIndex(i)
+
+        window.comboBox_videoCodec.currentIndexChanged.connect(
+            self.updateCodecSettings
+        )
+
+        window.comboBox_audioCodec.currentIndexChanged.connect(
+            self.updateCodecSettings
+        )
+
+        vBitrate = int(self.settings.value('outputVideoBitrate'))
+        aBitrate = int(self.settings.value('outputAudioBitrate'))
+
+        window.spinBox_vBitrate.setValue(vBitrate)
+        window.spinBox_aBitrate.setValue(aBitrate)
+        window.spinBox_vBitrate.valueChanged.connect(self.updateCodecSettings)
+        window.spinBox_aBitrate.valueChanged.connect(self.updateCodecSettings)
+
+        # Make component buttons
+        self.compMenu = QMenu()
+        for i, comp in enumerate(self.core.modules):
+            action = self.compMenu.addAction(comp.Component.name)
+            action.triggered.connect(
+                lambda _, item=i: self.addComponent(0, item)
+            )
+
+        self.window.pushButton_addComponent.setMenu(self.compMenu)
+
+        componentList.dropEvent = self.dragComponent
+        componentList.itemSelectionChanged.connect(
+            self.changeComponentWidget
+        )
+        componentList.itemSelectionChanged.connect(
+            self.presetManager.clearPresetListSelection
+        )
+        self.window.pushButton_removeComponent.clicked.connect(
+            lambda: self.removeComponent()
+        )
+
+        componentList.setContextMenuPolicy(QtCore.Qt.CustomContextMenu)
+        componentList.customContextMenuRequested.connect(
+            self.componentContextMenu
+        )
+
+        currentRes = str(self.settings.value('outputWidth'))+'x' + \
+            str(self.settings.value('outputHeight'))
+        for i, res in enumerate(Core.resolutions):
+            window.comboBox_resolution.addItem(res)
+            if res == currentRes:
+                currentRes = i
+                window.comboBox_resolution.setCurrentIndex(currentRes)
+                window.comboBox_resolution.currentIndexChanged.connect(
+                    self.updateResolution
+                )
+
+        self.window.pushButton_listMoveUp.clicked.connect(
+            lambda: self.moveComponent(-1)
+        )
+        self.window.pushButton_listMoveDown.clicked.connect(
+            lambda: self.moveComponent(1)
+        )
+
+        # Configure the Projects Menu
+        self.projectMenu = QMenu()
+        self.window.menuButton_newProject = self.projectMenu.addAction(
+            "New Project"
+        )
+        self.window.menuButton_newProject.triggered.connect(
+            lambda: self.createNewProject()
+        )
+        self.window.menuButton_openProject = self.projectMenu.addAction(
+            "Open Project"
+        )
+        self.window.menuButton_openProject.triggered.connect(
+            lambda: self.openOpenProjectDialog()
+        )
+
+        action = self.projectMenu.addAction("Save Project")
+        action.triggered.connect(self.saveCurrentProject)
+
+        action = self.projectMenu.addAction("Save Project As")
+        action.triggered.connect(self.openSaveProjectDialog)
+
+        self.window.pushButton_projects.setMenu(self.projectMenu)
+
+        # Configure the Presets Button
+        self.window.pushButton_presets.clicked.connect(
+            self.openPresetManager
+        )
+
+        self.updateWindowTitle()
+        log.debug('Showing main window')
+        window.show()
+
+        if project and project != self.autosavePath:
+            if not project.endswith('.avp'):
+                project += '.avp'
+            # open a project from the commandline
+            if not os.path.dirname(project):
+                project = os.path.join(
+                    self.settings.value("projectDir"), project
+                )
+            self.currentProject = project
+            self.settings.setValue("currentProject", project)
+            if os.path.exists(self.autosavePath):
+                os.remove(self.autosavePath)
+        else:
+            # open the last currentProject from settings
+            self.currentProject = self.settings.value("currentProject")
+
+            # delete autosave if it's identical to this project
+            if self.autosaveExists(identical=True):
+                os.remove(self.autosavePath)
+
+            if self.currentProject and os.path.exists(self.autosavePath):
+                ch = self.showMessage(
+                    msg="Restore unsaved changes in project '%s'?"
+                    % os.path.basename(self.currentProject)[:-4],
+                    showCancel=True)
+                if ch:
+                    self.saveProjectChanges()
+                else:
+                    os.remove(self.autosavePath)
+
+        self.openProject(self.currentProject, prompt=False)
+        self.drawPreview(True)
+
+        # verify Pillow version
+        if not self.settings.value("pilMsgShown") \
+                and 'post' not in Image.PILLOW_VERSION:
+            self.showMessage(
+                msg="You are using the standard version of the "
+                "Python imaging library (Pillow %s). Upgrade "
+                "to the Pillow-SIMD fork to enable hardware accelerations "
+                "and export videos faster." % Image.PILLOW_VERSION
+            )
+            self.settings.setValue("pilMsgShown", True)
+
+        # verify Ffmpeg version
+        if not self.settings.value("ffmpegMsgShown"):
+            try:
+                with open(os.devnull, "w") as f:
+                    ffmpegVers = checkOutput(
+                        ['ffmpeg', '-version'], stderr=f
+                    )
+                goodVersion = str(ffmpegVers).split()[2].startswith('3')
+            except Exception:
+                goodVersion = False
+        else:
+            goodVersion = True
+
+        if not goodVersion:
+            self.showMessage(
+                msg="You're using an old version of Ffmpeg. "
+                "Some features may not work as expected."
+            )
+        self.settings.setValue("ffmpegMsgShown", True)
+
+        # Hotkeys for projects
+        QtWidgets.QShortcut("Ctrl+S", self.window, self.saveCurrentProject)
+        QtWidgets.QShortcut("Ctrl+A", self.window, self.openSaveProjectDialog)
+        QtWidgets.QShortcut("Ctrl+O", self.window, self.openOpenProjectDialog)
+        QtWidgets.QShortcut("Ctrl+N", self.window, self.createNewProject)
+
+        QtWidgets.QShortcut("Ctrl+Z", self.window, self.undoStack.undo)
+        QtWidgets.QShortcut("Ctrl+Y", self.window, self.undoStack.redo)
+        QtWidgets.QShortcut("Ctrl+Shift+Z", self.window, self.undoStack.redo)
+
+        # Hotkeys for component list
+        for inskey in ("Ctrl+T", QtCore.Qt.Key_Insert):
+            QtWidgets.QShortcut(
+                inskey, self.window,
+                activated=lambda: self.window.pushButton_addComponent.click()
+            )
+        for delkey in ("Ctrl+R", QtCore.Qt.Key_Delete):
+            QtWidgets.QShortcut(
+                delkey, self.window.listWidget_componentList,
+                self.removeComponent
+            )
+        QtWidgets.QShortcut(
+            "Ctrl+Space", self.window,
+            activated=lambda: self.window.listWidget_componentList.setFocus()
+        )
+        QtWidgets.QShortcut(
+            "Ctrl+Shift+S", self.window,
+            self.presetManager.openSavePresetDialog
+        )
+        QtWidgets.QShortcut(
+            "Ctrl+Shift+C", self.window, self.presetManager.clearPreset
+        )
+
+        QtWidgets.QShortcut(
+            "Ctrl+Up", self.window.listWidget_componentList,
+            activated=lambda: self.moveComponent(-1)
+        )
+        QtWidgets.QShortcut(
+            "Ctrl+Down", self.window.listWidget_componentList,
+            activated=lambda: self.moveComponent(1)
+        )
+        QtWidgets.QShortcut(
+            "Ctrl+Home", self.window.listWidget_componentList,
+            activated=lambda: self.moveComponent('top')
+        )
+        QtWidgets.QShortcut(
+            "Ctrl+End", self.window.listWidget_componentList,
+            activated=lambda: self.moveComponent('bottom')
+        )
+
+        QtWidgets.QShortcut(
+            "Ctrl+Shift+F", self.window, self.showFfmpegCommand
+        )
+        QtWidgets.QShortcut(
+            "Ctrl+Shift+U", self.window, self.showUndoStack
+        )
+
+        if log.isEnabledFor(logging.DEBUG):
+            QtWidgets.QShortcut(
+                "Ctrl+Alt+Shift+R", self.window, self.drawPreview
+            )
+            QtWidgets.QShortcut(
+                "Ctrl+Alt+Shift+A", self.window, lambda: log.debug(repr(self))
+            )
+
+    def __repr__(self):
+        return (
+            '\n%s\n'
+            '#####\n'
+            'Preview thread is %s\n' % (
+                repr(self.core),
+                'live' if self.previewThread.isRunning() else 'dead',
+            )
+        )
+
+    def cleanUp(self, *args):
+        log.info('Ending the preview thread')
+        self.timer.stop()
+        self.previewThread.quit()
+        self.previewThread.wait()
+
+    def terminate(self, *args):
+        self.cleanUp()
+        sys.exit(0)
+
+    @disableWhenOpeningProject
+    def updateWindowTitle(self):
+        appName = 'Audio Visualizer'
+        try:
+            if self.currentProject:
+                appName += ' - %s' % \
+                    os.path.splitext(
+                        os.path.basename(self.currentProject))[0]
+            if self.autosaveExists(identical=False):
+                appName += '*'
+        except AttributeError:
+            pass
+        log.verbose('Setting window title to %s' % appName)
+        self.window.setWindowTitle(appName)
+
+    @QtCore.pyqtSlot(int, dict)
+    def updateComponentTitle(self, pos, presetStore=False):
+        '''
+            Sets component title to modified or unmodified when given boolean.
+            If given a preset dict, compares it against the component to
+            determine if it is modified.
+            A component with no preset is always unmodified.
+        '''
+        if type(presetStore) is dict:
+            name = presetStore['preset']
+            if name is None or name not in self.core.savedPresets:
+                modified = False
+            else:
+                modified = (presetStore != self.core.savedPresets[name])
+
+        modified = bool(presetStore)
+        if pos < 0:
+            pos = len(self.core.selectedComponents)-1
+        name = self.core.selectedComponents[pos].name
+        title = str(name)
+        if self.core.selectedComponents[pos].currentPreset:
+            title += ' - %s' % self.core.selectedComponents[pos].currentPreset
+            if modified:
+                title += '*'
+        if type(presetStore) is bool:
+            log.debug(
+                'Forcing %s #%s\'s modified status to %s: %s',
+                name, pos, modified, title
+            )
+        else:
+            log.debug(
+                'Setting %s #%s\'s title: %s',
+                name, pos, title
+            )
+        self.window.listWidget_componentList.item(pos).setText(title)
+
+    def updateCodecs(self):
+        containerWidget = self.window.comboBox_videoContainer
+        vCodecWidget = self.window.comboBox_videoCodec
+        aCodecWidget = self.window.comboBox_audioCodec
+        index = containerWidget.currentIndex()
+        name = containerWidget.itemText(index)
+        self.settings.setValue('outputContainer', name)
+
+        vCodecWidget.clear()
+        aCodecWidget.clear()
+
+        for container in Core.encoderOptions['containers']:
+            if container['name'] == name:
+                for vCodec in container['video-codecs']:
+                    vCodecWidget.addItem(vCodec)
+                for aCodec in container['audio-codecs']:
+                    aCodecWidget.addItem(aCodec)
+
+    def updateCodecSettings(self):
+        '''Updates settings.ini to match encoder option widgets'''
+        vCodecWidget = self.window.comboBox_videoCodec
+        vBitrateWidget = self.window.spinBox_vBitrate
+        aBitrateWidget = self.window.spinBox_aBitrate
+        aCodecWidget = self.window.comboBox_audioCodec
+        currentVideoCodec = vCodecWidget.currentIndex()
+        currentVideoCodec = vCodecWidget.itemText(currentVideoCodec)
+        currentVideoBitrate = vBitrateWidget.value()
+        currentAudioCodec = aCodecWidget.currentIndex()
+        currentAudioCodec = aCodecWidget.itemText(currentAudioCodec)
+        currentAudioBitrate = aBitrateWidget.value()
+        self.settings.setValue('outputVideoCodec', currentVideoCodec)
+        self.settings.setValue('outputAudioCodec', currentAudioCodec)
+        self.settings.setValue('outputVideoBitrate', currentVideoBitrate)
+        self.settings.setValue('outputAudioBitrate', currentAudioBitrate)
+
+    @disableWhenOpeningProject
+    def autosave(self, force=False):
+        if not self.currentProject:
+            if os.path.exists(self.autosavePath):
+                os.remove(self.autosavePath)
+        elif force or time.time() - self.lastAutosave >= self.autosaveCooldown:
+            self.core.createProjectFile(self.autosavePath, self.window)
+            self.lastAutosave = time.time()
+            if len(self.autosaveTimes) >= 5:
+                # Do some math to reduce autosave spam. This gives a smooth
+                # curve up to 5 seconds cooldown and maintains that for 30 secs
+                # if a component is continuously updated
+                timeDiff = self.lastAutosave - self.autosaveTimes.pop()
+                if not force and timeDiff >= 1.0 \
+                        and timeDiff <= 10.0:
+                    if self.autosaveCooldown / 4.0 < 0.5:
+                        self.autosaveCooldown += 1.0
+                    self.autosaveCooldown = (
+                            5.0 * (self.autosaveCooldown / 5.0)
+                        ) + (self.autosaveCooldown / 5.0) * 2
+                elif force or timeDiff >= self.autosaveCooldown * 5:
+                    self.autosaveCooldown = 0.2
+            self.autosaveTimes.insert(0, self.lastAutosave)
+        else:
+            log.debug('Autosave rejected by cooldown')
+
+    def autosaveExists(self, identical=True):
+        '''Determines if creating the autosave should be blocked.'''
+        try:
+            if self.currentProject and os.path.exists(self.autosavePath) \
+                and filecmp.cmp(
+                    self.autosavePath, self.currentProject) == identical:
+                log.debug(
+                    'Autosave found %s to be identical'
+                    % 'not' if not identical else ''
+                )
+                return True
+        except FileNotFoundError:
+            log.error(
+                'Project file couldn\'t be located: %s', self.currentProject)
+            return identical
+        return False
+
+    def saveProjectChanges(self):
+        '''Overwrites project file with autosave file'''
+        try:
+            os.remove(self.currentProject)
+            os.rename(self.autosavePath, self.currentProject)
+            return True
+        except (FileNotFoundError, IsADirectoryError) as e:
+            self.showMessage(
+                msg='Project file couldn\'t be saved.',
+                detail=str(e))
+            return False
+
+    def openInputFileDialog(self):
+        inputDir = self.settings.value("inputDir", os.path.expanduser("~"))
+
+        fileName, _ = QtWidgets.QFileDialog.getOpenFileName(
+            self.window, "Open Audio File",
+            inputDir, "Audio Files (%s)" % " ".join(Core.audioFormats))
+
+        if fileName:
+            self.settings.setValue("inputDir", os.path.dirname(fileName))
+            self.window.lineEdit_audioFile.setText(fileName)
+
+    def openOutputFileDialog(self):
+        outputDir = self.settings.value("outputDir", os.path.expanduser("~"))
+
+        fileName, _ = QtWidgets.QFileDialog.getSaveFileName(
+            self.window, "Set Output Video File",
+            outputDir,
+            "Video Files (%s);; All Files (*)" % " ".join(
+                Core.videoFormats))
+
+        if fileName:
+            self.settings.setValue("outputDir", os.path.dirname(fileName))
+            self.window.lineEdit_outputFile.setText(fileName)
+
+    def stopVideo(self):
+        log.info('Export cancelled')
+        self.videoWorker.cancel()
+        self.canceled = True
+
+    def createAudioVisualisation(self):
+        # create output video if mandatory settings are filled in
+        audioFile = self.window.lineEdit_audioFile.text()
+        outputPath = self.window.lineEdit_outputFile.text()
+
+        if audioFile and outputPath and self.core.selectedComponents:
+            if not os.path.dirname(outputPath):
+                outputPath = os.path.join(
+                    os.path.expanduser("~"), outputPath)
+            if outputPath and os.path.isdir(outputPath):
+                self.showMessage(
+                    msg='Chosen filename matches a directory, which '
+                        'cannot be overwritten. Please choose a different '
+                        'filename or move the directory.',
+                    icon='Warning',
+                )
+                return
+        else:
+            if not audioFile or not outputPath:
+                self.showMessage(
+                    msg="You must select an audio file and output filename."
+                )
+            elif not self.core.selectedComponents:
+                self.showMessage(
+                    msg="Not enough components."
+                )
+            return
+
+        self.canceled = False
+        self.progressBarUpdated(-1)
+        self.videoWorker = self.core.newVideoWorker(
+            self, audioFile, outputPath
+        )
+        self.videoWorker.progressBarUpdate.connect(self.progressBarUpdated)
+        self.videoWorker.progressBarSetText.connect(
+            self.progressBarSetText)
+        self.videoWorker.imageCreated.connect(self.showPreviewImage)
+        self.videoWorker.encoding.connect(self.changeEncodingStatus)
+        self.createVideo.emit()
+
+    @QtCore.pyqtSlot(str, str)
+    def videoThreadError(self, msg, detail):
+        try:
+            self.stopVideo()
+        except AttributeError as e:
+            if 'videoWorker' not in str(e):
+                raise
+        self.showMessage(
+            msg=msg,
+            detail=detail,
+            icon='Critical',
+        )
+        log.info('%s', repr(self))
+
+    def changeEncodingStatus(self, status):
+        self.encoding = status
+        if status:
+            self.window.pushButton_createVideo.setEnabled(False)
+            self.window.pushButton_Cancel.setEnabled(True)
+            self.window.comboBox_resolution.setEnabled(False)
+            self.window.stackedWidget.setEnabled(False)
+            self.window.tab_encoderSettings.setEnabled(False)
+            self.window.label_audioFile.setEnabled(False)
+            self.window.toolButton_selectAudioFile.setEnabled(False)
+            self.window.label_outputFile.setEnabled(False)
+            self.window.toolButton_selectOutputFile.setEnabled(False)
+            self.window.lineEdit_audioFile.setEnabled(False)
+            self.window.lineEdit_outputFile.setEnabled(False)
+            self.window.pushButton_addComponent.setEnabled(False)
+            self.window.pushButton_removeComponent.setEnabled(False)
+            self.window.pushButton_listMoveDown.setEnabled(False)
+            self.window.pushButton_listMoveUp.setEnabled(False)
+            self.window.menuButton_newProject.setEnabled(False)
+            self.window.menuButton_openProject.setEnabled(False)
+            if sys.platform == 'darwin':
+                self.window.progressLabel.setHidden(False)
+            else:
+                self.window.listWidget_componentList.setEnabled(False)
+        else:
+            self.window.pushButton_createVideo.setEnabled(True)
+            self.window.pushButton_Cancel.setEnabled(False)
+            self.window.comboBox_resolution.setEnabled(True)
+            self.window.stackedWidget.setEnabled(True)
+            self.window.tab_encoderSettings.setEnabled(True)
+            self.window.label_audioFile.setEnabled(True)
+            self.window.toolButton_selectAudioFile.setEnabled(True)
+            self.window.lineEdit_audioFile.setEnabled(True)
+            self.window.label_outputFile.setEnabled(True)
+            self.window.toolButton_selectOutputFile.setEnabled(True)
+            self.window.lineEdit_outputFile.setEnabled(True)
+            self.window.pushButton_addComponent.setEnabled(True)
+            self.window.pushButton_removeComponent.setEnabled(True)
+            self.window.pushButton_listMoveDown.setEnabled(True)
+            self.window.pushButton_listMoveUp.setEnabled(True)
+            self.window.menuButton_newProject.setEnabled(True)
+            self.window.menuButton_openProject.setEnabled(True)
+            self.window.listWidget_componentList.setEnabled(True)
+            self.window.progressLabel.setHidden(True)
+            self.drawPreview(True)
+
+    @QtCore.pyqtSlot(int)
+    def progressBarUpdated(self, value):
+        self.window.progressBar_createVideo.setValue(value)
+
+    @QtCore.pyqtSlot(str)
+    def progressBarSetText(self, value):
+        if sys.platform == 'darwin':
+            self.window.progressLabel.setText(value)
+        else:
+            self.window.progressBar_createVideo.setFormat(value)
+
+    def updateResolution(self):
+        resIndex = int(self.window.comboBox_resolution.currentIndex())
+        res = Core.resolutions[resIndex].split('x')
+        changed = res[0] != self.settings.value("outputWidth")
+        self.settings.setValue('outputWidth', res[0])
+        self.settings.setValue('outputHeight', res[1])
+        if changed:
+            for i in range(len(self.core.selectedComponents)):
+                self.core.updateComponent(i)
+
+    def drawPreview(self, force=False, **kwargs):
+        '''Use autosave keyword arg to force saving or not saving if needed'''
+        self.newTask.emit(self.core.selectedComponents)
+        # self.processTask.emit()
+        if force or 'autosave' in kwargs:
+            if force or kwargs['autosave']:
+                self.autosave(True)
+        else:
+            self.autosave()
+        self.updateWindowTitle()
+
+    @QtCore.pyqtSlot(QtGui.QImage)
+    def showPreviewImage(self, image):
+        self.previewWindow.changePixmap(image)
+
+    def showUndoStack(self):
+        dialog = QtWidgets.QDialog(self.window)
+        undoView = QtWidgets.QUndoView(self.undoStack)
+        layout = QtWidgets.QVBoxLayout()
+        layout.addWidget(undoView)
+        dialog.setLayout(layout)
+        dialog.show()
+
+    def showFfmpegCommand(self):
+        from textwrap import wrap
+        from toolkit.ffmpeg import createFfmpegCommand
+        command = createFfmpegCommand(
+            self.window.lineEdit_audioFile.text(),
+            self.window.lineEdit_outputFile.text(),
+            self.core.selectedComponents
+        )
+        lines = wrap(" ".join(command), 49)
+        self.showMessage(
+            msg="Current FFmpeg command:\n\n %s" % " ".join(lines)
+        )
+
+    def addComponent(self, compPos, moduleIndex):
+        '''Creates an undoable action that adds a new component.'''
+        action = AddComponent(self, compPos, moduleIndex)
+        self.undoStack.push(action)
+
+    def insertComponent(self, index):
+        '''Triggered by Core to finish initializing a new component.'''
+        componentList = self.window.listWidget_componentList
+        stackedWidget = self.window.stackedWidget
+
+        componentList.insertItem(
+            index,
+            self.core.selectedComponents[index].name)
+        componentList.setCurrentRow(index)
+
+        # connect to signal that adds an asterisk when modified
+        self.core.selectedComponents[index].modified.connect(
+            self.updateComponentTitle)
+
+        self.pages.insert(index, self.core.selectedComponents[index].page)
+        stackedWidget.insertWidget(index, self.pages[index])
+        stackedWidget.setCurrentIndex(index)
+
+        return index
+
+    def removeComponent(self):
+        componentList = self.window.listWidget_componentList
+        selected = componentList.selectedItems()
+        if selected:
+            action = RemoveComponent(self, selected)
+            self.undoStack.push(action)
+
+    def _removeComponent(self, index):
+        stackedWidget = self.window.stackedWidget
+        componentList = self.window.listWidget_componentList
+        stackedWidget.removeWidget(self.pages[index])
+        componentList.takeItem(index)
+        self.core.removeComponent(index)
+        self.pages.pop(index)
+        self.changeComponentWidget()
+        self.drawPreview()
+
+    @disableWhenEncoding
+    def moveComponent(self, change):
+        '''Moves a component relatively from its current position'''
+        componentList = self.window.listWidget_componentList
+        tag = change
+        if change == 'top':
+            change = -componentList.currentRow()
+        elif change == 'bottom':
+            change = len(componentList)-componentList.currentRow()-1
+        else:
+            tag = 'down' if change == 1 else 'up'
+
+        row = componentList.currentRow()
+        newRow = row + change
+        if newRow > -1 and newRow < componentList.count():
+            action = MoveComponent(self, row, newRow, tag)
+            self.undoStack.push(action)
+
+    def getComponentListMousePos(self, position):
+        '''
+        Given a QPos, returns the component index under the mouse cursor
+        or -1 if no component is there.
+        '''
+        componentList = self.window.listWidget_componentList
+
+        modelIndexes = [
+            componentList.model().index(i)
+            for i in range(componentList.count())
+        ]
+        rects = [
+            componentList.visualRect(modelIndex)
+            for modelIndex in modelIndexes
+        ]
+        mousePos = [rect.contains(position) for rect in rects]
+        if not any(mousePos):
+            # Not clicking a component
+            mousePos = -1
+        else:
+            mousePos = mousePos.index(True)
+        log.debug('Click component list row %s' % mousePos)
+        return mousePos
+
+    @disableWhenEncoding
+    def dragComponent(self, event):
+        '''Used as Qt drop event for the component listwidget'''
+        componentList = self.window.listWidget_componentList
+        mousePos = self.getComponentListMousePos(event.pos())
+        if mousePos > -1:
+            change = (componentList.currentRow() - mousePos) * -1
+        else:
+            change = (componentList.count() - componentList.currentRow() - 1)
+        self.moveComponent(change)
+
+    def changeComponentWidget(self):
+        selected = self.window.listWidget_componentList.selectedItems()
+        if selected:
+            index = self.window.listWidget_componentList.row(selected[0])
+            self.window.stackedWidget.setCurrentIndex(index)
+
+    def openPresetManager(self):
+        '''Preset manager for importing, exporting, renaming, deleting'''
+        self.presetManager.show()
+
+    def clear(self):
+        '''Get a blank slate'''
+        self.core.clearComponents()
+        self.window.listWidget_componentList.clear()
+        for widget in self.pages:
+            self.window.stackedWidget.removeWidget(widget)
+        self.pages = []
+        for field in (
+                self.window.lineEdit_audioFile,
+                self.window.lineEdit_outputFile
+                ):
+            with blockSignals(field):
+                field.setText('')
+        self.progressBarUpdated(0)
+        self.progressBarSetText('')
+        self.undoStack.clear()
+
+    @disableWhenEncoding
+    def createNewProject(self, prompt=True):
+        if prompt:
+            self.openSaveChangesDialog('starting a new project')
+
+        self.clear()
+        self.currentProject = None
+        self.settings.setValue("currentProject", None)
+        self.drawPreview(True)
+
+    def saveCurrentProject(self):
+        if self.currentProject:
+            self.core.createProjectFile(self.currentProject, self.window)
+            try:
+                os.remove(self.autosavePath)
+            except FileNotFoundError:
+                pass
+            self.updateWindowTitle()
+        else:
+            self.openSaveProjectDialog()
+
+    def openSaveChangesDialog(self, phrase):
+        success = True
+        if self.autosaveExists(identical=False):
+            ch = self.showMessage(
+                msg="You have unsaved changes in project '%s'. "
+                "Save before %s?" % (
+                    os.path.basename(self.currentProject)[:-4],
+                    phrase
+                ),
+                showCancel=True)
+            if ch:
+                success = self.saveProjectChanges()
+
+        if success and os.path.exists(self.autosavePath):
+            os.remove(self.autosavePath)
+
+    def openSaveProjectDialog(self):
+        filename, _ = QtWidgets.QFileDialog.getSaveFileName(
+            self.window, "Create Project File",
+            self.settings.value("projectDir"),
+            "Project Files (*.avp)")
+        if not filename:
+            return
+        if not filename.endswith(".avp"):
+            filename += '.avp'
+        self.settings.setValue("projectDir", os.path.dirname(filename))
+        self.settings.setValue("currentProject", filename)
+        self.currentProject = filename
+        self.core.createProjectFile(filename, self.window)
+        self.updateWindowTitle()
+
+    @disableWhenEncoding
+    def openOpenProjectDialog(self):
+        filename, _ = QtWidgets.QFileDialog.getOpenFileName(
+            self.window, "Open Project File",
+            self.settings.value("projectDir"),
+            "Project Files (*.avp)")
+        self.openProject(filename)
+
+    def openProject(self, filepath, prompt=True):
+        if not filepath or not os.path.exists(filepath) \
+                or not filepath.endswith('.avp'):
+            return
+
+        self.clear()
+        # ask to save any changes that are about to get deleted
+        if prompt:
+            self.openSaveChangesDialog('opening another project')
+
+        self.currentProject = filepath
+        self.settings.setValue("currentProject", filepath)
+        self.settings.setValue("projectDir", os.path.dirname(filepath))
+        # actually load the project using core method
+        self.core.openProject(self, filepath)
+        self.drawPreview(autosave=False)
+        self.updateWindowTitle()
+
+    def showMessage(self, **kwargs):
+        parent = kwargs['parent'] if 'parent' in kwargs else self.window
+        msg = QtWidgets.QMessageBox(parent)
+        msg.setModal(True)
+        msg.setText(kwargs['msg'])
+        msg.setIcon(
+            eval('QtWidgets.QMessageBox.%s' % kwargs['icon'])
+            if 'icon' in kwargs else QtWidgets.QMessageBox.Information
+        )
+        msg.setDetailedText(kwargs['detail'] if 'detail' in kwargs else None)
+        if 'showCancel'in kwargs and kwargs['showCancel']:
+            msg.setStandardButtons(
+                QtWidgets.QMessageBox.Ok | QtWidgets.QMessageBox.Cancel)
+        else:
+            msg.setStandardButtons(QtWidgets.QMessageBox.Ok)
+        ch = msg.exec_()
+        if ch == 1024:
+            return True
+        return False
+
+    @disableWhenEncoding
+    def componentContextMenu(self, QPos):
+        '''Appears when right-clicking the component list'''
+        componentList = self.window.listWidget_componentList
+        self.menu = QMenu()
+        parentPosition = componentList.mapToGlobal(QtCore.QPoint(0, 0))
+
+        index = self.getComponentListMousePos(QPos)
+        if index > -1:
+            # Show preset menu if clicking a component
+            self.presetManager.findPresets()
+            menuItem = self.menu.addAction("Save Preset")
+            menuItem.triggered.connect(
+                self.presetManager.openSavePresetDialog
+            )
+
+            # submenu for opening presets
+            try:
+                presets = self.presetManager.presets[
+                    str(self.core.selectedComponents[index])
+                ]
+                self.presetSubmenu = QMenu("Open Preset")
+                self.menu.addMenu(self.presetSubmenu)
+
+                for version, presetName in presets:
+                    menuItem = self.presetSubmenu.addAction(presetName)
+                    menuItem.triggered.connect(
+                        lambda _, presetName=presetName:
+                            self.presetManager.openPreset(presetName)
+                    )
+            except KeyError:
+                pass
+
+            if self.core.selectedComponents[index].currentPreset:
+                menuItem = self.menu.addAction("Clear Preset")
+                menuItem.triggered.connect(
+                    self.presetManager.clearPreset
+                )
+            self.menu.addSeparator()
+
+        # "Add Component" submenu
+        self.submenu = QMenu("Add")
+        self.menu.addMenu(self.submenu)
+        insertCompAtTop = self.settings.value("pref_insertCompAtTop")
+        for i, comp in enumerate(self.core.modules):
+            menuItem = self.submenu.addAction(comp.Component.name)
+            menuItem.triggered.connect(
+                lambda _, item=i: self.addComponent(
+                    0 if insertCompAtTop else index, item
+                )
+            )
+
+        self.menu.move(parentPosition + QPos)
+        self.menu.show()