Python screenshot tool (fullscreen/area selection)

screenshot.py

#!/usr/bin/env python
# Python screenshot tool (fullscreen/area selection)

import sys
import os
from io import BytesIO
from PyQt5 import QtCore, QtGui
from PyQt5.QtGui import QPixmap, QScreen
from PyQt5.QtWidgets import QApplication, QWidget, QLabel, QSizePolicy, QGroupBox, QSpinBox, QCheckBox, QGridLayout, QPushButton, QHBoxLayout, QVBoxLayout, QFileDialog
from subprocess import getoutput
from io import StringIO
from Xlib import X, display, Xutil

# Documentation for python-xlib here:
# http://python-xlib.sourceforge.net/doc/html/index.html

class XSelect:
    def __init__(self, display):
        # X display
        self.d = display

        # Screen
        self.screen = self.d.screen()

        # Draw on the root window (desktop surface)
        self.window = self.screen.root

        # If only I could get this working...
        #cursor = xobject.cursor.Cursor(self.d, Xcursorfont.crosshair)
        #cursor = self.d.create_resource_object('cursor', Xcursorfont.X_cursor)
        self.cursor = X.NONE

        colormap = self.screen.default_colormap
        color = colormap.alloc_color(0, 0, 0)
        # Xor it because we'll draw with X.GXxor function
        xor_color = color.pixel ^ 0xffffff

        self.gc = self.window.create_gc(
            line_width = 1,
            line_style = X.LineSolid,
            fill_style = X.FillOpaqueStippled,
            fill_rule  = X.WindingRule,
            cap_style  = X.CapButt,
            join_style = X.JoinMiter,
            foreground = xor_color,
            background = self.screen.black_pixel,
            function = X.GXxor,
            graphics_exposures = False,
            subwindow_mode = X.IncludeInferiors,
        )

    def get_mouse_selection(self):
        started = False
        start   = dict(x=0, y=0)
        end     = dict(x=0, y=0)
        last    = None
        drawlimit = 10
        i = 0

        self.window.grab_pointer(self.d, X.PointerMotionMask|X.ButtonReleaseMask|X.ButtonPressMask,
                X.GrabModeAsync, X.GrabModeAsync, X.NONE, self.cursor, X.CurrentTime)

        self.window.grab_keyboard(self.d, X.GrabModeAsync, X.GrabModeAsync, X.CurrentTime)

        while True:
            e = self.d.next_event()

            # Window has been destroyed, quit
            if e.type == X.DestroyNotify:
                break

            # Mouse button press
            elif e.type == X.ButtonPress:
                # Left mouse button?
                if e.detail == 1:
                    start = dict(x=e.root_x, y=e.root_y)
                    started = True

                # Right mouse button?
                elif e.detail == 3:
                    return

            # Mouse button release
            elif e.type == X.ButtonRelease:
                end = dict(x=e.root_x, y=e.root_y)
                if last:
                    self.draw_rectangle(start, last)
                break

            # Mouse movement
            elif e.type == X.MotionNotify and started:
                i = i + 1
                if i % drawlimit != 0:
                    continue

                if last:
                    self.draw_rectangle(start, last)
                    last = None

                last = dict(x=e.root_x, y=e.root_y)
                self.draw_rectangle(start, last)

        self.d.ungrab_keyboard(X.CurrentTime)
        self.d.ungrab_pointer(X.CurrentTime)
        self.d.sync()

        coords = self.get_coords(start, end)
        if coords['width'] <= 1 or coords['height'] <= 1:
            return
        return [coords['start']['x'], coords['start']['y'], coords['width'], coords['height']]

    def get_coords(self, start, end):
        safe_start = dict(x=0, y=0)
        safe_end   = dict(x=0, y=0)

        if start['x'] > end['x']:
            safe_start['x'] = end['x']
            safe_end['x']   = start['x']
        else:
            safe_start['x'] = start['x']
            safe_end['x']   = end['x']

        if start['y'] > end['y']:
            safe_start['y'] = end['y']
            safe_end['y']   = start['y']
        else:
            safe_start['y'] = start['y']
            safe_end['y']   = end['y']

        return {
            'start': {
                'x': safe_start['x'],
                'y': safe_start['y'],
            },
            'end': {
                'x': safe_end['x'],
                'y': safe_end['y'],
            },
            'width' : safe_end['x'] - safe_start['x'],
            'height': safe_end['y'] - safe_start['y'],
        }

    def draw_rectangle(self, start, end):
        coords = self.get_coords(start, end)
        self.window.rectangle(self.gc,
            coords['start']['x'],
            coords['start']['y'],
            coords['end']['x'] - coords['start']['x'],
            coords['end']['y'] - coords['start']['y']
        )


class Screenshot(QWidget):
    def __init__(self):
        super(Screenshot, self).__init__()

        self.screenshotLabel = QLabel()
        self.screenshotLabel.setSizePolicy(QSizePolicy.Expanding,
                QSizePolicy.Expanding)
        self.screenshotLabel.setAlignment(QtCore.Qt.AlignCenter)
        self.screenshotLabel.setMinimumSize(240, 160)

        self.createOptionsGroupBox()
        self.createButtonsLayout()

        mainLayout = QVBoxLayout()
        mainLayout.addWidget(self.screenshotLabel)
        mainLayout.addWidget(self.optionsGroupBox)
        mainLayout.addLayout(self.buttonsLayout)
        self.setLayout(mainLayout)

        self.area = None
        self.shootScreen()
        self.delaySpinBox.setValue(1)

        self.setWindowTitle("Screenshot")
        self.resize(300, 200)

    def resizeEvent(self, event):
        scaledSize = self.originalPixmap.size()
        scaledSize.scale(self.screenshotLabel.size(), QtCore.Qt.KeepAspectRatio)
        if not self.screenshotLabel.pixmap() or scaledSize != self.screenshotLabel.pixmap().size():
            self.updateScreenshotLabel()

    def selectArea(self):
        self.hide()

        xs = XSelect(display.Display())
        self.area = xs.get_mouse_selection()

        if self.area:
            xo, yo, x, y = self.area
            self.areaLabel.setText("Area: x%s y%s to x%s y%s" % (xo, yo, x, y))
            self.shootScreen()
        else:
            self.areaLabel.setText("Area: fullscreen")
            self.shootScreen()

        self.show()

    def newScreenshot(self):
        if self.hideThisWindowCheckBox.isChecked():
            self.hide()
        self.newScreenshotButton.setDisabled(True)

        QtCore.QTimer.singleShot(self.delaySpinBox.value() * 1000, self.shootScreen)

    def saveScreenshot(self):
        format = 'png'
        initialPath = QtCore.QDir.currentPath() + "/untitled." + format

        fileName, fileSuffixSelection = QFileDialog.getSaveFileName(
            self,
            "Save As",
            initialPath,
            "{} Files (*.{});;All Files (*)".format(format.upper(), format))

        if fileName:
                self.originalPixmap.save(str(fileName), format)

    def copyToClipboard(self):
        if not self.originalPixmap:
            return
        qi = self.originalPixmap.toImage()
        QApplication.clipboard().setImage(qi)

    def shootScreen(self):
        if self.delaySpinBox.value() != 0:
            QApplication.beep()

        # Garbage collect any existing image first.
        self.originalPixmap = None
        screen = QApplication.primaryScreen()
        self.originalPixmap = screen.grabWindow(QApplication.desktop().winId())
        if self.area is not None:
            qi = self.originalPixmap.toImage()
            qi = qi.copy(int(self.area[0]), int(self.area[1]), int(self.area[2]), int(self.area[3]))
            self.originalPixmap = None
            self.originalPixmap = QPixmap.fromImage(qi)

        self.updateScreenshotLabel()

        self.newScreenshotButton.setDisabled(False)
        if self.hideThisWindowCheckBox.isChecked():
            self.show()

    def updateCheckBox(self):
        if self.delaySpinBox.value() == 0:
            self.hideThisWindowCheckBox.setDisabled(True)
        else:
            self.hideThisWindowCheckBox.setDisabled(False)

    def createOptionsGroupBox(self):
        self.optionsGroupBox = QGroupBox("Options")

        self.delaySpinBox = QSpinBox()
        self.delaySpinBox.setSuffix(" s")
        self.delaySpinBox.setMaximum(60)
        self.delaySpinBox.valueChanged.connect(self.updateCheckBox)

        self.delaySpinBoxLabel = QLabel("Screenshot Delay:")

        self.hideThisWindowCheckBox = QCheckBox("Hide This Window")
        self.hideThisWindowCheckBox.setChecked(True)

        self.areaLabel = QLabel("Area: fullscreen")

        optionsGroupBoxLayout = QGridLayout()
        optionsGroupBoxLayout.addWidget(self.delaySpinBoxLabel, 0, 0)
        optionsGroupBoxLayout.addWidget(self.delaySpinBox, 0, 1)
        optionsGroupBoxLayout.addWidget(self.hideThisWindowCheckBox, 1, 0)
        optionsGroupBoxLayout.addWidget(self.areaLabel, 1, 1)
        self.optionsGroupBox.setLayout(optionsGroupBoxLayout)

    def createButtonsLayout(self):
        self.selectAreaButton = self.createButton(
            "Select Area",
            self.selectArea
        )

        self.newScreenshotButton = self.createButton(
            "New Screenshot",
            self.newScreenshot
        )

        self.copyScreenshotButton = self.createButton(
            "Copy to Clipboard",
            self.copyToClipboard
        )

        self.saveScreenshotButton = self.createButton(
            "Save Screenshot",
            self.saveScreenshot
        )

        self.quitScreenshotButton = self.createButton(
            "Quit",
            self.close
        )

        self.buttonsLayout = QHBoxLayout()
        self.buttonsLayout.addStretch()
        self.buttonsLayout.addWidget(self.selectAreaButton)
        self.buttonsLayout.addWidget(self.newScreenshotButton)
        self.buttonsLayout.addWidget(self.copyScreenshotButton)
        self.buttonsLayout.addWidget(self.saveScreenshotButton)
        self.buttonsLayout.addWidget(self.quitScreenshotButton)

    def createButton(self, text, member):
        button = QPushButton(text)
        button.clicked.connect(member)
        return button

    def updateScreenshotLabel(self):
        self.screenshotLabel.setPixmap(self.originalPixmap.scaled(
                self.screenshotLabel.size(), QtCore.Qt.KeepAspectRatio,
                QtCore.Qt.SmoothTransformation))

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