eric6/Project/ProjectResourcesBrowser.py

# -*- coding: utf-8 -*-

# Copyright (c) 2002 - 2021 Detlev Offenbach <detlev@die-offenbachs.de>
#

"""
Module implementing a class used to display the resources part of the project.
"""

import os

from PyQt5.QtCore import QThread, QFileInfo, pyqtSignal, QProcess
from PyQt5.QtWidgets import QDialog, QApplication, QMenu

from E5Gui.E5Application import e5App
from E5Gui import E5MessageBox, E5FileDialog
from E5Gui.E5ProgressDialog import E5ProgressDialog

from .ProjectBrowserModel import (
    ProjectBrowserFileItem, ProjectBrowserSimpleDirectoryItem,
    ProjectBrowserDirectoryItem, ProjectBrowserResourceType
)
from .ProjectBaseBrowser import ProjectBaseBrowser

import UI.PixmapCache
from UI.NotificationWidget import NotificationTypes

import Preferences
import Utilities


class ProjectResourcesBrowser(ProjectBaseBrowser):
    """
    A class used to display the resources part of the project.
    
    @signal appendStderr(str) emitted after something was received from
        a QProcess on stderr
    @signal showMenu(str, QMenu) emitted when a menu is about to be shown.
        The name of the menu and a reference to the menu are given.
    """
    appendStderr = pyqtSignal(str)
    showMenu = pyqtSignal(str, QMenu)
    
    RCFilenameFormatPython = "{0}_rc.py"
    RCFilenameFormatRuby = "{0}_rc.rb"
    
    def __init__(self, project, parent=None):
        """
        Constructor
        
        @param project reference to the project object
        @param parent parent widget of this browser (QWidget)
        """
        ProjectBaseBrowser.__init__(self, project, ProjectBrowserResourceType,
                                    parent)
        
        self.selectedItemsFilter = [ProjectBrowserFileItem,
                                    ProjectBrowserSimpleDirectoryItem]
        
        self.setWindowTitle(self.tr('Resources'))

        self.setWhatsThis(self.tr(
            """<b>Project Resources Browser</b>"""
            """<p>This allows to easily see all resources contained in the"""
            """ current project. Several actions can be executed via the"""
            """ context menu.</p>"""
        ))
        
        self.compileProc = None
        
    def _createPopupMenus(self):
        """
        Protected overloaded method to generate the popup menu.
        """
        self.menuActions = []
        self.multiMenuActions = []
        self.dirMenuActions = []
        self.dirMultiMenuActions = []
        
        self.menu = QMenu(self)
        if self.project.getProjectType() in [
            "PyQt5", "PyQt5C", "E6Plugin",
            "PySide2", "PySide2C", "PySide6", "PySide6C"
        ]:
            self.menu.addAction(
                self.tr('Compile resource'),
                self.__compileResource)
            self.menu.addAction(
                self.tr('Compile all resources'),
                self.__compileAllResources)
            self.menu.addSeparator()
            self.menu.addAction(
                self.tr('Configure rcc Compiler'),
                self.__configureRccCompiler)
            self.menu.addSeparator()
        else:
            if self.hooks["compileResource"] is not None:
                self.menu.addAction(
                    self.hooksMenuEntries.get(
                        "compileResource",
                        self.tr('Compile resource')),
                    self.__compileResource)
            if self.hooks["compileAllResources"] is not None:
                self.menu.addAction(
                    self.hooksMenuEntries.get(
                        "compileAllResources",
                        self.tr('Compile all resources')),
                    self.__compileAllResources)
            if (
                self.hooks["compileResource"] is not None or
                self.hooks["compileAllResources"] is not None
            ):
                self.menu.addSeparator()
        self.menu.addAction(self.tr('Open'), self.__openFile)
        self.menu.addSeparator()
        act = self.menu.addAction(self.tr('Rename file'), self._renameFile)
        self.menuActions.append(act)
        act = self.menu.addAction(
            self.tr('Remove from project'), self._removeFile)
        self.menuActions.append(act)
        act = self.menu.addAction(self.tr('Delete'), self.__deleteFile)
        self.menuActions.append(act)
        self.menu.addSeparator()
        if self.project.getProjectType() in [
            "PyQt5", "PyQt5C", "E6Plugin",
            "PySide2", "PySide2C", "PySide6", "PySide6C"
        ]:
            self.menu.addAction(
                self.tr('New resource...'), self.__newResource)
        else:
            if self.hooks["newResource"] is not None:
                self.menu.addAction(
                    self.hooksMenuEntries.get(
                        "newResource",
                        self.tr('New resource...')), self.__newResource)
        self.menu.addAction(
            self.tr('Add resources...'), self.__addResourceFiles)
        self.menu.addAction(
            self.tr('Add resources directory...'),
            self.__addResourcesDirectory)
        self.menu.addSeparator()
        self.menu.addAction(
            self.tr('Copy Path to Clipboard'), self._copyToClipboard)
        self.menu.addSeparator()
        self.menu.addAction(
            self.tr('Expand all directories'), self._expandAllDirs)
        self.menu.addAction(
            self.tr('Collapse all directories'), self._collapseAllDirs)
        self.menu.addSeparator()
        self.menu.addAction(self.tr('Configure...'), self._configure)

        self.backMenu = QMenu(self)
        if self.project.getProjectType() in [
            "PyQt5", "PyQt5C", "E6Plugin",
            "PySide2", "PySide2C", "PySide6", "PySide6C"
        ]:
            self.backMenu.addAction(
                self.tr('Compile all resources'),
                self.__compileAllResources)
            self.backMenu.addSeparator()
            self.backMenu.addAction(
                self.tr('Configure rcc Compiler'),
                self.__configureRccCompiler)
            self.backMenu.addSeparator()
            self.backMenu.addAction(
                self.tr('New resource...'), self.__newResource)
        else:
            if self.hooks["compileAllResources"] is not None:
                self.backMenu.addAction(
                    self.hooksMenuEntries.get(
                        "compileAllResources",
                        self.tr('Compile all resources')),
                    self.__compileAllResources)
                self.backMenu.addSeparator()
            if self.hooks["newResource"] is not None:
                self.backMenu.addAction(
                    self.hooksMenuEntries.get(
                        "newResource",
                        self.tr('New resource...')), self.__newResource)
        self.backMenu.addAction(
            self.tr('Add resources...'), self.project.addResourceFiles)
        self.backMenu.addAction(
            self.tr('Add resources directory...'),
            self.project.addResourceDir)
        self.backMenu.addSeparator()
        self.backMenu.addAction(
            self.tr('Expand all directories'), self._expandAllDirs)
        self.backMenu.addAction(
            self.tr('Collapse all directories'), self._collapseAllDirs)
        self.backMenu.addSeparator()
        self.backMenu.addAction(self.tr('Configure...'), self._configure)
        self.backMenu.setEnabled(False)

        # create the menu for multiple selected files
        self.multiMenu = QMenu(self)
        if self.project.getProjectType() in [
            "PyQt5", "PyQt5C", "E6Plugin",
            "PySide2", "PySide2C", "PySide6", "PySide6C"
        ]:
            act = self.multiMenu.addAction(
                self.tr('Compile resources'),
                self.__compileSelectedResources)
            self.multiMenu.addSeparator()
            self.multiMenu.addAction(
                self.tr('Configure rcc Compiler'),
                self.__configureRccCompiler)
            self.multiMenu.addSeparator()
        else:
            if self.hooks["compileSelectedResources"] is not None:
                act = self.multiMenu.addAction(
                    self.hooksMenuEntries.get(
                        "compileSelectedResources",
                        self.tr('Compile resources')),
                    self.__compileSelectedResources)
                self.multiMenu.addSeparator()
        self.multiMenu.addAction(self.tr('Open'), self.__openFile)
        self.multiMenu.addSeparator()
        act = self.multiMenu.addAction(
            self.tr('Remove from project'), self._removeFile)
        self.multiMenuActions.append(act)
        act = self.multiMenu.addAction(
            self.tr('Delete'), self.__deleteFile)
        self.multiMenuActions.append(act)
        self.multiMenu.addSeparator()
        self.multiMenu.addAction(
            self.tr('Expand all directories'), self._expandAllDirs)
        self.multiMenu.addAction(
            self.tr('Collapse all directories'), self._collapseAllDirs)
        self.multiMenu.addSeparator()
        self.multiMenu.addAction(self.tr('Configure...'), self._configure)

        self.dirMenu = QMenu(self)
        if self.project.getProjectType() in [
            "PyQt5", "PyQt5C", "E6Plugin",
            "PySide2", "PySide2C", "PySide6", "PySide6C"
        ]:
            self.dirMenu.addAction(
                self.tr('Compile all resources'),
                self.__compileAllResources)
            self.dirMenu.addSeparator()
            self.dirMenu.addAction(
                self.tr('Configure rcc Compiler'),
                self.__configureRccCompiler)
            self.dirMenu.addSeparator()
        else:
            if self.hooks["compileAllResources"] is not None:
                self.dirMenu.addAction(
                    self.hooksMenuEntries.get(
                        "compileAllResources",
                        self.tr('Compile all resources')),
                    self.__compileAllResources)
                self.dirMenu.addSeparator()
        act = self.dirMenu.addAction(
            self.tr('Remove from project'), self._removeDir)
        self.dirMenuActions.append(act)
        act = self.dirMenu.addAction(
            self.tr('Delete'), self._deleteDirectory)
        self.dirMenuActions.append(act)
        self.dirMenu.addSeparator()
        self.dirMenu.addAction(
            self.tr('New resource...'), self.__newResource)
        self.dirMenu.addAction(
            self.tr('Add resources...'), self.__addResourceFiles)
        self.dirMenu.addAction(
            self.tr('Add resources directory...'),
            self.__addResourcesDirectory)
        self.dirMenu.addSeparator()
        self.dirMenu.addAction(
            self.tr('Copy Path to Clipboard'), self._copyToClipboard)
        self.dirMenu.addSeparator()
        self.dirMenu.addAction(
            self.tr('Expand all directories'), self._expandAllDirs)
        self.dirMenu.addAction(
            self.tr('Collapse all directories'), self._collapseAllDirs)
        self.dirMenu.addSeparator()
        self.dirMenu.addAction(self.tr('Configure...'), self._configure)
        
        self.dirMultiMenu = QMenu(self)
        if self.project.getProjectType() in [
            "PyQt5", "PyQt5C", "E6Plugin",
            "PySide2", "PySide2C", "PySide6", "PySide6C"
        ]:
            self.dirMultiMenu.addAction(
                self.tr('Compile all resources'),
                self.__compileAllResources)
            self.dirMultiMenu.addSeparator()
            self.dirMultiMenu.addAction(
                self.tr('Configure rcc Compiler'),
                self.__configureRccCompiler)
            self.dirMultiMenu.addSeparator()
        else:
            if self.hooks["compileAllResources"] is not None:
                self.dirMultiMenu.addAction(
                    self.hooksMenuEntries.get(
                        "compileAllResources",
                        self.tr('Compile all resources')),
                    self.__compileAllResources)
                self.dirMultiMenu.addSeparator()
        self.dirMultiMenu.addAction(
            self.tr('Add resources...'),
            self.project.addResourceFiles)
        self.dirMultiMenu.addAction(
            self.tr('Add resources directory...'),
            self.project.addResourceDir)
        self.dirMultiMenu.addSeparator()
        self.dirMultiMenu.addAction(
            self.tr('Expand all directories'), self._expandAllDirs)
        self.dirMultiMenu.addAction(
            self.tr('Collapse all directories'), self._collapseAllDirs)
        self.dirMultiMenu.addSeparator()
        self.dirMultiMenu.addAction(
            self.tr('Configure...'), self._configure)
        
        self.menu.aboutToShow.connect(self.__showContextMenu)
        self.multiMenu.aboutToShow.connect(self.__showContextMenuMulti)
        self.dirMenu.aboutToShow.connect(self.__showContextMenuDir)
        self.dirMultiMenu.aboutToShow.connect(self.__showContextMenuDirMulti)
        self.backMenu.aboutToShow.connect(self.__showContextMenuBack)
        self.mainMenu = self.menu
        
    def _contextMenuRequested(self, coord):
        """
        Protected slot to show the context menu.
        
        @param coord the position of the mouse pointer (QPoint)
        """
        if not self.project.isOpen():
            return
        
        try:
            categories = self.getSelectedItemsCountCategorized(
                [ProjectBrowserFileItem, ProjectBrowserSimpleDirectoryItem])
            cnt = categories["sum"]
            if cnt <= 1:
                index = self.indexAt(coord)
                if index.isValid():
                    self._selectSingleItem(index)
                    categories = self.getSelectedItemsCountCategorized(
                        [ProjectBrowserFileItem,
                         ProjectBrowserSimpleDirectoryItem])
                    cnt = categories["sum"]
                        
            bfcnt = categories[str(ProjectBrowserFileItem)]
            sdcnt = categories[str(ProjectBrowserSimpleDirectoryItem)]
            if cnt > 1 and cnt == bfcnt:
                self.multiMenu.popup(self.mapToGlobal(coord))
            elif cnt > 1 and cnt == sdcnt:
                self.dirMultiMenu.popup(self.mapToGlobal(coord))
            else:
                index = self.indexAt(coord)
                if cnt == 1 and index.isValid():
                    if bfcnt == 1:
                        self.menu.popup(self.mapToGlobal(coord))
                    elif sdcnt == 1:
                        self.dirMenu.popup(self.mapToGlobal(coord))
                    else:
                        self.backMenu.popup(self.mapToGlobal(coord))
                else:
                    self.backMenu.popup(self.mapToGlobal(coord))
        except Exception:           # secok
            pass
        
    def __showContextMenu(self):
        """
        Private slot called by the menu aboutToShow signal.
        """
        ProjectBaseBrowser._showContextMenu(self, self.menu)
        
        self.showMenu.emit("Main", self.menu)
        
    def __showContextMenuMulti(self):
        """
        Private slot called by the multiMenu aboutToShow signal.
        """
        ProjectBaseBrowser._showContextMenuMulti(self, self.multiMenu)
        
        self.showMenu.emit("MainMulti", self.multiMenu)
        
    def __showContextMenuDir(self):
        """
        Private slot called by the dirMenu aboutToShow signal.
        """
        ProjectBaseBrowser._showContextMenuDir(self, self.dirMenu)
        
        self.showMenu.emit("MainDir", self.dirMenu)
        
    def __showContextMenuDirMulti(self):
        """
        Private slot called by the dirMultiMenu aboutToShow signal.
        """
        ProjectBaseBrowser._showContextMenuDirMulti(self, self.dirMultiMenu)
        
        self.showMenu.emit("MainDirMulti", self.dirMultiMenu)
        
    def __showContextMenuBack(self):
        """
        Private slot called by the backMenu aboutToShow signal.
        """
        ProjectBaseBrowser._showContextMenuBack(self, self.backMenu)
        
        self.showMenu.emit("MainBack", self.backMenu)
        
    def __addResourceFiles(self):
        """
        Private method to add resource files to the project.
        """
        itm = self.model().item(self.currentIndex())
        if isinstance(itm, ProjectBrowserFileItem):
            dn = os.path.dirname(itm.fileName())
        elif isinstance(
            itm,
            (ProjectBrowserSimpleDirectoryItem, ProjectBrowserDirectoryItem)
        ):
            dn = itm.dirName()
        else:
            dn = None
        self.project.addFiles('resource', dn)
        
    def __addResourcesDirectory(self):
        """
        Private method to add resource files of a directory to the project.
        """
        itm = self.model().item(self.currentIndex())
        if isinstance(itm, ProjectBrowserFileItem):
            dn = os.path.dirname(itm.fileName())
        elif isinstance(
            itm,
            (ProjectBrowserSimpleDirectoryItem, ProjectBrowserDirectoryItem)
        ):
            dn = itm.dirName()
        else:
            dn = None
        self.project.addDirectory('resource', dn)
        
    def _openItem(self):
        """
        Protected slot to handle the open popup menu entry.
        """
        self.__openFile()
        
    def __openFile(self):
        """
        Private slot to handle the Open menu action.
        """
        itmList = self.getSelectedItems()
        for itm in itmList[:]:
            if isinstance(itm, ProjectBrowserFileItem):
                self.sourceFile.emit(itm.fileName())
        
    def __newResource(self):
        """
        Private slot to handle the New Resource menu action.
        """
        itm = self.model().item(self.currentIndex())
        if itm is None:
            path = self.project.ppath
        else:
            try:
                path = os.path.dirname(itm.fileName())
            except AttributeError:
                try:
                    path = itm.dirName()
                except AttributeError:
                    path = os.path.join(self.project.ppath, itm.data(0))
        
        if self.hooks["newResource"] is not None:
            self.hooks["newResource"](path)
        else:
            fname, selectedFilter = E5FileDialog.getSaveFileNameAndFilter(
                self,
                self.tr("New Resource"),
                path,
                self.tr("Qt Resource Files (*.qrc)"),
                "",
                E5FileDialog.Options(E5FileDialog.DontConfirmOverwrite))
            
            if not fname:
                # user aborted or didn't enter a filename
                return
            
            ext = QFileInfo(fname).suffix()
            if not ext:
                ex = selectedFilter.split("(*")[1].split(")")[0]
                if ex:
                    fname += ex
            
            if os.path.exists(fname):
                res = E5MessageBox.yesNo(
                    self,
                    self.tr("New Resource"),
                    self.tr("The file already exists! Overwrite it?"),
                    icon=E5MessageBox.Warning)
                if not res:
                    # user selected to not overwrite
                    return
            
            try:
                if self.project.useSystemEol():
                    newline = None
                else:
                    newline = self.project.getEolString()
                with open(fname, 'w', encoding="utf-8",
                          newline=newline) as rcfile:
                    rcfile.write('<!DOCTYPE RCC>\n')
                    rcfile.write('<RCC version="1.0">\n')
                    rcfile.write('<qresource>\n')
                    rcfile.write('</qresource>\n')
                    rcfile.write('</RCC>\n')
            except OSError as e:
                E5MessageBox.critical(
                    self,
                    self.tr("New Resource"),
                    self.tr(
                        "<p>The new resource file <b>{0}</b> could not"
                        " be created.<br>Problem: {1}</p>")
                    .format(fname, str(e)))
                return
            
            self.project.appendFile(fname)
            self.sourceFile.emit(fname)
        
    def __deleteFile(self):
        """
        Private method to delete a resource file from the project.
        """
        itmList = self.getSelectedItems()
        
        files = []
        fullNames = []
        for itm in itmList:
            fn2 = itm.fileName()
            fullNames.append(fn2)
            fn = self.project.getRelativePath(fn2)
            files.append(fn)
        
        from UI.DeleteFilesConfirmationDialog import (
            DeleteFilesConfirmationDialog
        )
        dlg = DeleteFilesConfirmationDialog(
            self.parent(),
            self.tr("Delete resources"),
            self.tr(
                "Do you really want to delete these resources from the"
                " project?"),
            files)
        
        if dlg.exec() == QDialog.DialogCode.Accepted:
            for fn2, fn in zip(fullNames, files):
                self.closeSourceWindow.emit(fn2)
                self.project.deleteFile(fn)
    
    ###########################################################################
    ##  Methods to handle the various compile commands
    ###########################################################################
    
    def __readStdout(self):
        """
        Private slot to handle the readyReadStandardOutput signal of the
        pyrcc5/pyside2-rcc/pyside6-rcc process.
        """
        if self.compileProc is None:
            return
        self.compileProc.setReadChannel(QProcess.ProcessChannel.StandardOutput)
        
        while self.compileProc and self.compileProc.canReadLine():
            self.buf += str(self.compileProc.readLine(),
                            Preferences.getSystem("IOEncoding"),
                            'replace')
        
    def __readStderr(self):
        """
        Private slot to handle the readyReadStandardError signal of the
        pyrcc5/pyside2-rcc/pyside6-rcc process.
        """
        if self.compileProc is None:
            return
        
        ioEncoding = Preferences.getSystem("IOEncoding")
        
        self.compileProc.setReadChannel(QProcess.ProcessChannel.StandardError)
        while self.compileProc and self.compileProc.canReadLine():
            s = self.rccCompiler + ': '
            error = str(self.compileProc.readLine(),
                        ioEncoding, 'replace')
            s += error
            self.appendStderr.emit(s)
        
    def __compileQRCDone(self, exitCode, exitStatus):
        """
        Private slot to handle the finished signal of the compile process.
        
        @param exitCode exit code of the process (integer)
        @param exitStatus exit status of the process (QProcess.ExitStatus)
        """
        self.compileRunning = False
        e5App().getObject("ViewManager").enableEditorsCheckFocusIn(True)
        ui = e5App().getObject("UserInterface")
        if (
            exitStatus == QProcess.ExitStatus.NormalExit and
            exitCode == 0 and
            self.buf
        ):
            ofn = os.path.join(self.project.ppath, self.compiledFile)
            try:
                if self.project.useSystemEol():
                    newline = None
                else:
                    newline = self.project.getEolString()
                with open(ofn, "w", encoding="utf-8", newline=newline) as f:
                    for line in self.buf.splitlines():
                        f.write(line + "\n")
                if self.compiledFile not in self.project.pdata["SOURCES"]:
                    self.project.appendFile(ofn)
                ui.showNotification(
                    UI.PixmapCache.getPixmap("resourcesCompiler48"),
                    self.tr("Resource Compilation"),
                    self.tr("The compilation of the resource file"
                            " was successful."))
            except OSError as msg:
                if not self.noDialog:
                    E5MessageBox.information(
                        self,
                        self.tr("Resource Compilation"),
                        self.tr(
                            "<p>The compilation of the resource file"
                            " failed.</p><p>Reason: {0}</p>").format(str(msg)))
        else:
            ui.showNotification(
                UI.PixmapCache.getPixmap("resourcesCompiler48"),
                self.tr("Resource Compilation"),
                self.tr(
                    "The compilation of the resource file failed."),
                kind=NotificationTypes.Critical,
                timeout=0)
        self.compileProc = None
        
    def __compileQRC(self, fn, noDialog=False, progress=None):
        """
        Private method to compile a .qrc file to a .py file.
        
        @param fn filename of the .ui file to be compiled
        @param noDialog flag indicating silent operations
        @param progress reference to the progress dialog
        @return reference to the compile process (QProcess)
        """
        self.compileProc = QProcess()
        args = []
        self.buf = ""
        
        if self.project.getProjectLanguage() == "Python3":
            if self.project.getProjectType() in ["PyQt5", "PyQt5C",
                                                 "E6Plugin"]:
                self.rccCompiler = Utilities.generatePyQtToolPath('pyrcc5')
            elif self.project.getProjectType() in ["PySide2", "PySide2C"]:
                self.rccCompiler = Utilities.generatePySideToolPath(
                    'pyside2-rcc', variant=2)
            elif self.project.getProjectType() in ["PySide6", "PySide6C"]:
                self.rccCompiler = Utilities.generatePySideToolPath(
                    'pyside6-rcc', variant=6)
            else:
                return None
            defaultParameters = self.project.getDefaultRccCompilerParameters()
            rccParameters = self.project.pdata["RCCPARAMS"]
            if (
                rccParameters["CompressionThreshold"] !=
                    defaultParameters["CompressionThreshold"]
            ):
                args.append("-threshold")
                args.append(str(rccParameters["CompressionThreshold"]))
            if (
                rccParameters["CompressLevel"] !=
                    defaultParameters["CompressLevel"]
            ):
                args.append("-compress")
                args.append(str(rccParameters["CompressLevel"]))
            if (
                rccParameters["CompressionDisable"] !=
                    defaultParameters["CompressionDisable"]
            ):
                args.append("-no-compress")
            if rccParameters["PathPrefix"] != defaultParameters["PathPrefix"]:
                args.append("-root")
                args.append(rccParameters["PathPrefix"])
        else:
            return None
        
        rcc = self.rccCompiler
        
        ofn, ext = os.path.splitext(fn)
        fn = os.path.join(self.project.ppath, fn)
        
        dirname, filename = os.path.split(ofn)
        if self.project.getProjectLanguage() == "Python3":
            self.compiledFile = os.path.join(
                dirname, self.RCFilenameFormatPython.format(filename))
        elif self.project.getProjectLanguage() == "Ruby":
            self.compiledFile = os.path.join(
                dirname, self.RCFilenameFormatRuby.format(filename))
        
        args.append(fn)
        self.compileProc.finished.connect(self.__compileQRCDone)
        self.compileProc.readyReadStandardOutput.connect(self.__readStdout)
        self.compileProc.readyReadStandardError.connect(self.__readStderr)
        
        self.noDialog = noDialog
        self.compileProc.start(rcc, args)
        procStarted = self.compileProc.waitForStarted(5000)
        if procStarted:
            self.compileRunning = True
            e5App().getObject("ViewManager").enableEditorsCheckFocusIn(False)
            return self.compileProc
        else:
            self.compileRunning = False
            if progress is not None:
                progress.cancel()
            E5MessageBox.critical(
                self,
                self.tr('Process Generation Error'),
                self.tr(
                    'Could not start {0}.<br>'
                    'Ensure that it is in the search path.'
                ).format(self.rccCompiler))
            return None
        
    def __compileResource(self):
        """
        Private method to compile a resource to a source file.
        """
        itm = self.model().item(self.currentIndex())
        fn2 = itm.fileName()
        fn = self.project.getRelativePath(fn2)
        if self.hooks["compileResource"] is not None:
            self.hooks["compileResource"](fn)
        else:
            self.__compileQRC(fn)
        
    def __compileAllResources(self):
        """
        Private method to compile all resources to source files.
        """
        if self.hooks["compileAllResources"] is not None:
            self.hooks["compileAllResources"](self.project.pdata["RESOURCES"])
        else:
            numResources = len(self.project.pdata["RESOURCES"])
            progress = E5ProgressDialog(
                self.tr("Compiling resources..."),
                self.tr("Abort"), 0, numResources,
                self.tr("%v/%m Resources"), self)
            progress.setModal(True)
            progress.setMinimumDuration(0)
            progress.setWindowTitle(self.tr("Resources"))
            
            for prog, fn in enumerate(self.project.pdata["RESOURCES"]):
                progress.setValue(prog)
                if progress.wasCanceled():
                    break
                proc = self.__compileQRC(fn, True, progress)
                if proc is not None:
                    while proc.state() == QProcess.ProcessState.Running:
                        QApplication.processEvents()
                        QThread.msleep(300)
                        QApplication.processEvents()
                else:
                    break
            progress.setValue(numResources)
        
    def __compileSelectedResources(self):
        """
        Private method to compile selected resources to source files.
        """
        items = self.getSelectedItems()
        files = [self.project.getRelativePath(itm.fileName())
                 for itm in items]
        
        if self.hooks["compileSelectedResources"] is not None:
            self.hooks["compileSelectedResources"](files)
        else:
            numResources = len(files)
            progress = E5ProgressDialog(
                self.tr("Compiling resources..."),
                self.tr("Abort"), 0, numResources,
                self.tr("%v/%m Resources"), self)
            progress.setModal(True)
            progress.setMinimumDuration(0)
            progress.setWindowTitle(self.tr("Resources"))
            
            for prog, fn in enumerate(files):
                progress.setValue(prog)
                if progress.wasCanceled():
                    break
                if not fn.endswith('.ui.h'):
                    proc = self.__compileQRC(fn, True, progress)
                    if proc is not None:
                        while proc.state() == QProcess.ProcessState.Running:
                            QApplication.processEvents()
                            QThread.msleep(300)
                            QApplication.processEvents()
                    else:
                        break
            progress.setValue(numResources)
        
    def __checkResourcesNewer(self, filename, mtime):
        """
        Private method to check, if any file referenced in a resource
        file is newer than a given time.
        
        @param filename filename of the resource file (string)
        @param mtime modification time to check against
        @return flag indicating some file is newer (boolean)
        """
        try:
            with open(filename, "r", encoding="utf-8") as f:
                buf = f.read()
        except OSError:
            return False
        
        qrcDirName = os.path.dirname(filename)
        lbuf = ""
        for line in buf.splitlines():
            line = line.strip()
            if (
                line.lower().startswith("<file>") or
                line.lower().startswith("<file ")
            ):
                lbuf = line
            elif lbuf:
                lbuf = "{0}{1}".format(lbuf, line)
            if lbuf.lower().endswith("</file>"):
                rfile = lbuf.split(">", 1)[1].split("<", 1)[0]
                if not os.path.isabs(rfile):
                    rfile = os.path.join(qrcDirName, rfile)
                if (
                    os.path.exists(rfile) and
                    os.stat(rfile).st_mtime > mtime
                ):
                    return True
                
                lbuf = ""
        
        return False
        
    def compileChangedResources(self):
        """
        Public method to compile all changed resources to source files.
        """
        if self.hooks["compileChangedResources"] is not None:
            self.hooks["compileChangedResources"](
                self.project.pdata["RESOURCES"])
        else:
            progress = E5ProgressDialog(
                self.tr("Determining changed resources..."),
                self.tr("Abort"), 0, 100, self.tr("%v/%m Resources"))
            progress.setMinimumDuration(0)
            progress.setWindowTitle(self.tr("Resources"))
            
            # get list of changed resources
            changedResources = []
            progress.setMaximum(len(self.project.pdata["RESOURCES"]))
            for prog, fn in enumerate(self.project.pdata["RESOURCES"]):
                progress.setValue(prog)
                QApplication.processEvents()
                ifn = os.path.join(self.project.ppath, fn)
                if self.project.getProjectLanguage() == "Python3":
                    dirname, filename = os.path.split(os.path.splitext(ifn)[0])
                    ofn = os.path.join(
                        dirname, self.RCFilenameFormatPython.format(filename))
                elif self.project.getProjectLanguage() == "Ruby":
                    dirname, filename = os.path.split(os.path.splitext(ifn)[0])
                    ofn = os.path.join(
                        dirname, self.RCFilenameFormatRuby.format(filename))
                else:
                    return
                if (
                    not os.path.exists(ofn) or
                    os.stat(ifn).st_mtime > os.stat(ofn).st_mtime or
                    self.__checkResourcesNewer(ifn, os.stat(ofn).st_mtime)
                ):
                    changedResources.append(fn)
            progress.setValue(len(self.project.pdata["RESOURCES"]))
            QApplication.processEvents()
            
            if changedResources:
                progress.setLabelText(
                    self.tr("Compiling changed resources..."))
                progress.setMaximum(len(changedResources))
                progress.setValue(0)
                QApplication.processEvents()
                for prog, fn in enumerate(changedResources):
                    progress.setValue(prog)
                    if progress.wasCanceled():
                        break
                    proc = self.__compileQRC(fn, True, progress)
                    if proc is not None:
                        while proc.state() == QProcess.ProcessState.Running:
                            QApplication.processEvents()
                            QThread.msleep(300)
                            QApplication.processEvents()
                    else:
                        break
                progress.setValue(len(changedResources))
                QApplication.processEvents()
        
    def handlePreferencesChanged(self):
        """
        Public slot used to handle the preferencesChanged signal.
        """
        ProjectBaseBrowser.handlePreferencesChanged(self)
    
    def __configureRccCompiler(self):
        """
        Private slot to configure some non-common rcc compiler options.
        """
        from .RccCompilerOptionsDialog import RccCompilerOptionsDialog
        
        params = self.project.pdata["RCCPARAMS"]
        
        dlg = RccCompilerOptionsDialog(params)
        if dlg.exec() == QDialog.DialogCode.Accepted:
            threshold, compression, noCompression, root = dlg.getData()
            if threshold != params["CompressionThreshold"]:
                params["CompressionThreshold"] = threshold
                self.project.setDirty(True)
            if compression != params["CompressLevel"]:
                params["CompressLevel"] = compression
                self.project.setDirty(True)
            if noCompression != params["CompressionDisable"]:
                params["CompressionDisable"] = noCompression
                self.project.setDirty(True)
            if root != params["PathPrefix"]:
                params["PathPrefix"] = root
                self.project.setDirty(True)
    
    ###########################################################################
    ## Support for hooks below
    ###########################################################################
    
    def _initHookMethods(self):
        """
        Protected method to initialize the hooks dictionary.
        
        Supported hook methods are:
        <ul>
        <li>compileResource: takes filename as parameter</li>
        <li>compileAllResources: takes list of filenames as parameter</li>
        <li>compileChangedResources: takes list of filenames as parameter</li>
        <li>compileSelectedResources: takes list of all form filenames as
            parameter</li>
        <li>newResource: takes full directory path of new file as
            parameter</li>
        </ul>
        
        <b>Note</b>: Filenames are relative to the project directory, if not
        specified differently.
        """
        self.hooks = {
            "compileResource": None,
            "compileAllResources": None,
            "compileChangedResources": None,
            "compileSelectedResources": None,
            "newResource": None,
        }