src/eric7/Snapshot/SnapWidget.py

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

# Copyright (c) 2012 - 2022 Detlev Offenbach <detlev@die-offenbachs.de>
#

"""
Module implementing the snapshot widget.
"""

#
# SnapWidget and its associated modules are PyQt6 ports of Ksnapshot.
#

import os
import pathlib
import re
import contextlib

from PyQt6.QtCore import (
    pyqtSlot,
    Qt,
    QTimer,
    QPoint,
    QMimeData,
    QLocale,
    QStandardPaths,
)
from PyQt6.QtGui import QImageWriter, QPixmap, QDrag, QKeySequence, QShortcut
from PyQt6.QtWidgets import QWidget, QApplication

from eric7.EricWidgets import EricFileDialog, EricMessageBox

from .Ui_SnapWidget import Ui_SnapWidget

from eric7.EricGui import EricPixmapCache
from eric7 import Globals, Preferences

from .SnapshotModes import SnapshotModes


class SnapWidget(QWidget, Ui_SnapWidget):
    """
    Class implementing the snapshot widget.
    """

    def __init__(self, parent=None):
        """
        Constructor

        @param parent reference to the parent widget (QWidget)
        """
        super().__init__(parent)
        self.setupUi(self)

        self.saveButton.setIcon(EricPixmapCache.getIcon("fileSaveAs"))
        self.takeButton.setIcon(EricPixmapCache.getIcon("cameraPhoto"))
        self.copyButton.setIcon(EricPixmapCache.getIcon("editCopy"))
        self.copyPreviewButton.setIcon(EricPixmapCache.getIcon("editCopy"))
        self.setWindowIcon(EricPixmapCache.getIcon("ericSnap"))

        if Globals.isWaylandSession():
            from .SnapshotWaylandGrabber import SnapshotWaylandGrabber

            self.__grabber = SnapshotWaylandGrabber(self)
        else:
            from .SnapshotDefaultGrabber import SnapshotDefaultGrabber

            self.__grabber = SnapshotDefaultGrabber(self)
            self.decorationsCheckBox.hide()
            self.mouseCursorCheckBox.hide()
        self.__grabber.grabbed.connect(self.__captured)
        supportedModes = self.__grabber.supportedModes()

        if SnapshotModes.FULLSCREEN in supportedModes:
            self.modeCombo.addItem(self.tr("Fullscreen"), SnapshotModes.FULLSCREEN)
        if (
            SnapshotModes.SELECTEDSCREEN in supportedModes
            and len(QApplication.screens()) > 1
        ):
            self.modeCombo.addItem(
                self.tr("Select Screen"), SnapshotModes.SELECTEDSCREEN
            )
        if SnapshotModes.SELECTEDWINDOW in supportedModes:
            self.modeCombo.addItem(
                self.tr("Select Window"), SnapshotModes.SELECTEDWINDOW
            )
        if SnapshotModes.RECTANGLE in supportedModes:
            self.modeCombo.addItem(
                self.tr("Rectangular Selection"), SnapshotModes.RECTANGLE
            )
        if SnapshotModes.ELLIPSE in supportedModes:
            self.modeCombo.addItem(
                self.tr("Elliptical Selection"), SnapshotModes.ELLIPSE
            )
        if SnapshotModes.FREEHAND in supportedModes:
            self.modeCombo.addItem(
                self.tr("Freehand Selection"), SnapshotModes.FREEHAND
            )
        mode = int(Preferences.getSettings().value("Snapshot/Mode", 0))
        index = self.modeCombo.findData(SnapshotModes(mode))
        if index == -1:
            index = 0
        self.modeCombo.setCurrentIndex(index)

        delay = int(Preferences.getSettings().value("Snapshot/Delay", 0))
        self.delaySpin.setValue(delay)

        picturesLocation = QStandardPaths.writableLocation(
            QStandardPaths.StandardLocation.PicturesLocation
        )
        self.__filename = Preferences.getSettings().value(
            "Snapshot/Filename",
            os.path.join(picturesLocation, self.tr("snapshot") + "1.png"),
        )

        self.__snapshot = QPixmap()
        self.__savedPosition = QPoint()
        self.__modified = False
        self.__locale = QLocale()

        self.__initFileFilters()
        self.__initShortcuts()

        self.preview.startDrag.connect(self.__dragSnapshot)

        self.__updateTimer = QTimer()
        self.__updateTimer.setSingleShot(True)
        self.__updateTimer.timeout.connect(self.__updatePreview)

        self.__updateCaption()
        self.takeButton.setFocus()

    def __initFileFilters(self):
        """
        Private method to define the supported image file filters.
        """
        filters = {
            "bmp": self.tr("Windows Bitmap File (*.bmp)"),
            "gif": self.tr("Graphic Interchange Format File (*.gif)"),
            "ico": self.tr("Windows Icon File (*.ico)"),
            "jpg": self.tr("JPEG File (*.jpg)"),
            "mng": self.tr("Multiple-Image Network Graphics File (*.mng)"),
            "pbm": self.tr("Portable Bitmap File (*.pbm)"),
            "pcx": self.tr("Paintbrush Bitmap File (*.pcx)"),
            "pgm": self.tr("Portable Graymap File (*.pgm)"),
            "png": self.tr("Portable Network Graphics File (*.png)"),
            "ppm": self.tr("Portable Pixmap File (*.ppm)"),
            "sgi": self.tr("Silicon Graphics Image File (*.sgi)"),
            "svg": self.tr("Scalable Vector Graphics File (*.svg)"),
            "tga": self.tr("Targa Graphic File (*.tga)"),
            "tif": self.tr("TIFF File (*.tif)"),
            "xbm": self.tr("X11 Bitmap File (*.xbm)"),
            "xpm": self.tr("X11 Pixmap File (*.xpm)"),
        }

        outputFormats = []
        writeFormats = QImageWriter.supportedImageFormats()
        for writeFormat in writeFormats:
            with contextlib.suppress(KeyError):
                outputFormats.append(filters[bytes(writeFormat).decode()])
        outputFormats.sort()
        self.__outputFilter = ";;".join(outputFormats)

        self.__defaultFilter = filters["png"]

    def __initShortcuts(self):
        """
        Private method to initialize the keyboard shortcuts.
        """
        self.__quitShortcut = QShortcut(
            QKeySequence(QKeySequence.StandardKey.Quit), self, self.close
        )

        self.__copyShortcut = QShortcut(
            QKeySequence(QKeySequence.StandardKey.Copy),
            self,
            self.copyButton.animateClick,
        )

        self.__quickSaveShortcut = QShortcut(
            QKeySequence(Qt.Key.Key_Q), self, self.__quickSave
        )

        self.__save1Shortcut = QShortcut(
            QKeySequence(QKeySequence.StandardKey.Save),
            self,
            self.saveButton.animateClick,
        )
        self.__save2Shortcut = QShortcut(
            QKeySequence(Qt.Key.Key_S), self, self.saveButton.animateClick
        )

        self.__grab1Shortcut = QShortcut(
            QKeySequence(QKeySequence.StandardKey.New),
            self,
            self.takeButton.animateClick,
        )
        self.__grab2Shortcut = QShortcut(
            QKeySequence(Qt.Key.Key_N), self, self.takeButton.animateClick
        )
        self.__grab3Shortcut = QShortcut(
            QKeySequence(Qt.Key.Key_Space), self, self.takeButton.animateClick
        )

    def __quickSave(self):
        """
        Private slot to save the snapshot bypassing the file selection dialog.
        """
        if not self.__snapshot.isNull():
            while os.path.exists(self.__filename):
                self.__autoIncFilename()

            if self.__saveImage(self.__filename):
                self.__modified = False
                self.__autoIncFilename()
                self.__updateCaption()

    @pyqtSlot()
    def on_saveButton_clicked(self):
        """
        Private slot to save the snapshot.
        """
        if not self.__snapshot.isNull():
            while os.path.exists(self.__filename):
                self.__autoIncFilename()

            fileName, selectedFilter = EricFileDialog.getSaveFileNameAndFilter(
                self,
                self.tr("Save Snapshot"),
                self.__filename,
                self.__outputFilter,
                self.__defaultFilter,
                EricFileDialog.DontConfirmOverwrite,
            )
            if not fileName:
                return

            fpath = pathlib.Path(fileName)
            if not fpath.suffix:
                ex = selectedFilter.split("(*")[1].split(")")[0]
                if ex:
                    fpath = fpath.with_suffix(ex)

            if self.__saveImage(str(fpath)):
                self.__modified = False
                self.__filename = str(fpath)
                self.__autoIncFilename()
                self.__updateCaption()

    def __saveImage(self, fileName):
        """
        Private method to save the snapshot.

        @param fileName name of the file to save to (string)
        @return flag indicating success (boolean)
        """
        if pathlib.Path(fileName).exists():
            res = EricMessageBox.yesNo(
                self,
                self.tr("Save Snapshot"),
                self.tr(
                    "<p>The file <b>{0}</b> already exists." " Overwrite it?</p>"
                ).format(fileName),
                icon=EricMessageBox.Warning,
            )
            if not res:
                return False

        ok = self.__snapshot.save(fileName)
        if not ok:
            EricMessageBox.warning(
                self,
                self.tr("Save Snapshot"),
                self.tr("Cannot write file '{0}'.").format(fileName),
            )

        return ok

    def __autoIncFilename(self):
        """
        Private method to auto-increment the file name.
        """
        # Extract the file name
        name = os.path.basename(self.__filename)

        # If the name contains a number, then increment it.
        numSearch = re.compile("(^|[^\\d])(\\d+)")
        # We want to match as far left as possible, and when the number is
        # at the start of the name.

        # Does it have a number?
        matches = list(numSearch.finditer(name))
        if matches:
            # It has a number, increment it.
            match = matches[-1]
            start = match.start(2)
            # Only the second group is of interest.
            numAsStr = match.group(2)
            number = "{0:0{width}d}".format(int(numAsStr) + 1, width=len(numAsStr))
            name = name[:start] + number + name[start + len(numAsStr) :]
        else:
            # no number
            start = name.rfind(".")
            if start != -1:
                # has a '.' somewhere, e.g. it has an extension
                name = name[:start] + "-1" + name[start:]
            else:
                # no extension, just tack it on to the end
                name += "-1"

        self.__filename = os.path.join(os.path.dirname(self.__filename), name)
        self.__updateCaption()

    @pyqtSlot()
    def on_takeButton_clicked(self):
        """
        Private slot to take a snapshot.
        """
        self.__savedPosition = self.pos()
        self.hide()

        self.__grabber.grab(
            self.modeCombo.itemData(self.modeCombo.currentIndex()),
            self.delaySpin.value(),
            self.mouseCursorCheckBox.isChecked(),
            self.decorationsCheckBox.isChecked(),
        )

    def __redisplay(self):
        """
        Private method to redisplay the window.
        """
        self.__updatePreview()
        if not self.__savedPosition.isNull():
            self.move(self.__savedPosition)
        self.show()
        self.raise_()

        self.saveButton.setEnabled(not self.__snapshot.isNull())
        self.copyButton.setEnabled(not self.__snapshot.isNull())
        self.copyPreviewButton.setEnabled(not self.__snapshot.isNull())

    @pyqtSlot()
    def on_copyButton_clicked(self):
        """
        Private slot to copy the snapshot to the clipboard.
        """
        if not self.__snapshot.isNull():
            QApplication.clipboard().setPixmap(QPixmap(self.__snapshot))

    @pyqtSlot()
    def on_copyPreviewButton_clicked(self):
        """
        Private slot to copy the snapshot preview to the clipboard.
        """
        QApplication.clipboard().setPixmap(self.preview.pixmap())

    def __captured(self, pixmap):
        """
        Private slot to show a preview of the snapshot.

        @param pixmap pixmap of the snapshot (QPixmap)
        """
        self.__snapshot = QPixmap(pixmap)

        self.__redisplay()
        self.__modified = not pixmap.isNull()
        self.__updateCaption()

    def __updatePreview(self):
        """
        Private slot to update the preview picture.
        """
        self.preview.setToolTip(
            self.tr("Preview of the snapshot image ({0} x {1})").format(
                self.__locale.toString(self.__snapshot.width()),
                self.__locale.toString(self.__snapshot.height()),
            )
        )
        self.preview.setPreview(self.__snapshot)
        self.preview.adjustSize()

    def resizeEvent(self, evt):
        """
        Protected method handling a resizing of the window.

        @param evt resize event (QResizeEvent)
        """
        self.__updateTimer.start(200)

    def __dragSnapshot(self):
        """
        Private slot handling the dragging of the preview picture.
        """
        drag = QDrag(self)
        mimeData = QMimeData()
        mimeData.setImageData(self.__snapshot)
        drag.setMimeData(mimeData)
        drag.setPixmap(self.preview.pixmap())
        drag.exec(Qt.DropAction.CopyAction)

    def closeEvent(self, evt):
        """
        Protected method handling the close event.

        @param evt close event (QCloseEvent)
        """
        if self.__modified:
            res = EricMessageBox.question(
                self,
                self.tr("eric Snapshot"),
                self.tr("""The application contains an unsaved snapshot."""),
                EricMessageBox.Abort | EricMessageBox.Discard | EricMessageBox.Save,
            )
            if res == EricMessageBox.Abort:
                evt.ignore()
                return
            elif res == EricMessageBox.Save:
                self.on_saveButton_clicked()

        Preferences.getSettings().setValue("Snapshot/Delay", self.delaySpin.value())
        modeData = self.modeCombo.itemData(self.modeCombo.currentIndex())
        if modeData is not None:
            Preferences.getSettings().setValue("Snapshot/Mode", modeData.value)
        Preferences.getSettings().setValue("Snapshot/Filename", self.__filename)
        Preferences.getSettings().sync()

    def __updateCaption(self):
        """
        Private method to update the window caption.
        """
        self.setWindowTitle(
            "{0}[*] - {1}".format(
                os.path.basename(self.__filename), self.tr("eric Snapshot")
            )
        )
        self.setWindowModified(self.__modified)
        self.pathNameEdit.setText(os.path.dirname(self.__filename))

    @pyqtSlot(int)
    def on_modeCombo_currentIndexChanged(self, index):
        """
        Private slot handling the selection of a screenshot mode.

        @param index index of the selection
        @type int
        """
        isWindowMode = False
        if index >= 0:
            mode = self.modeCombo.itemData(index)
            isWindowMode = mode == SnapshotModes.SELECTEDWINDOW

        self.decorationsCheckBox.setEnabled(isWindowMode)
        self.decorationsCheckBox.setChecked(isWindowMode)