electrum/gui/qt/__init__.py

#!/usr/bin/env python
#
# Electrum - lightweight Bitcoin client
# Copyright (C) 2012 thomasv@gitorious
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.

import sys
import os
import signal

try:
    import PyQt4
except Exception:
    sys.exit("Error: Could not import PyQt4 on Linux systems, you may try 'sudo apt-get install python-qt4'")

from PyQt4.QtGui import *
from PyQt4.QtCore import *
import PyQt4.QtCore as QtCore

from electrum.i18n import _, set_language
from electrum.plugins import run_hook
from electrum import SimpleConfig, Wallet, WalletStorage
from electrum.paymentrequest import InvoiceStore
from electrum.contacts import Contacts
from electrum.synchronizer import Synchronizer
from electrum.verifier import SPV
from electrum.util import DebugMem
from electrum.wallet import Abstract_Wallet
from installwizard import InstallWizard


try:
    import icons_rc
except Exception:
    sys.exit("Error: Could not import icons_rc.py, please generate it with: 'pyrcc4 icons.qrc -o gui/qt/icons_rc.py'")

from util import *   # * needed for plugins
from main_window import ElectrumWindow


class OpenFileEventFilter(QObject):
    def __init__(self, windows):
        self.windows = windows
        super(OpenFileEventFilter, self).__init__()

    def eventFilter(self, obj, event):
        if event.type() == QtCore.QEvent.FileOpen:
            if len(self.windows) >= 1:
                self.windows[0].pay_to_URI(event.url().toEncoded())
                return True
        return False



class ElectrumGui:

    def __init__(self, config, network, plugins):
        set_language(config.get('language'))
        # Uncomment this call to verify objects are being properly
        # GC-ed when windows are closed
        #network.add_jobs([DebugMem([Abstract_Wallet, SPV, Synchronizer,
        #                            ElectrumWindow], interval=5)])
        self.network = network
        self.config = config
        self.plugins = plugins
        self.windows = []
        self.efilter = OpenFileEventFilter(self.windows)
        self.app = QApplication(sys.argv)
        self.app.installEventFilter(self.efilter)
        self.timer = Timer()
        # shared objects
        self.invoices = InvoiceStore(self.config)
        self.contacts = Contacts(self.config)
        # init tray
        self.dark_icon = self.config.get("dark_icon", False)
        self.tray = QSystemTrayIcon(self.tray_icon(), None)
        self.tray.setToolTip('Electrum')
        self.tray.activated.connect(self.tray_activated)
        self.build_tray_menu()
        self.tray.show()
        self.app.connect(self.app, QtCore.SIGNAL('new_window'), self.start_new_window)
        run_hook('init_qt', self)

    def build_tray_menu(self):
        # Avoid immediate GC of old menu when window closed via its action
        self.old_menu = self.tray.contextMenu()
        m = QMenu()
        for window in self.windows:
            submenu = m.addMenu(window.wallet.basename())
            submenu.addAction(_("Show/Hide"), window.show_or_hide)
            submenu.addAction(_("Close"), window.close)
        m.addAction(_("Dark/Light"), self.toggle_tray_icon)
        m.addSeparator()
        m.addAction(_("Exit Electrum"), self.close)
        self.tray.setContextMenu(m)

    def tray_icon(self):
        if self.dark_icon:
            return QIcon(':icons/electrum_dark_icon.png')
        else:
            return QIcon(':icons/electrum_light_icon.png')

    def toggle_tray_icon(self):
        self.dark_icon = not self.dark_icon
        self.config.set_key("dark_icon", self.dark_icon, True)
        self.tray.setIcon(self.tray_icon())

    def tray_activated(self, reason):
        if reason == QSystemTrayIcon.DoubleClick:
            if all([w.is_hidden() for w in self.windows]):
                for w in self.windows:
                    w.bring_to_top()
            else:
                for w in self.windows:
                    w.hide()

    def close(self):
        for window in self.windows:
            window.close()

    def load_wallet_file(self, filename):
        try:
            storage = WalletStorage(filename)
        except Exception as e:
            QMessageBox.information(None, _('Error'), str(e), _('OK'))
            return
        if not storage.file_exists:
            recent = self.config.get('recently_open', [])
            if filename in recent:
                recent.remove(filename)
                self.config.set_key('recently_open', recent)
            action = 'new'
        else:
            try:
                wallet = Wallet(storage)
            except BaseException as e:
                traceback.print_exc(file=sys.stdout)
                QMessageBox.warning(None, _('Warning'), str(e), _('OK'))
                return
            action = wallet.get_action()
        # run wizard
        if action is not None:
            wizard = InstallWizard(self.app, self.config, self.network, storage)
            wallet = wizard.run(action)
            # keep current wallet
            if not wallet:
                return
        else:
            wallet.start_threads(self.network)

        return wallet

    def new_window(self, path, uri=None):
        # Use a signal as can be called from daemon thread
        self.app.emit(SIGNAL('new_window'), path, uri)

    def start_new_window(self, path, uri):
        for w in self.windows:
            if w.wallet.storage.path == path:
                w.bring_to_top()
                break
        else:
            wallet = self.load_wallet_file(path)
            if not wallet:
                return
            w = ElectrumWindow(self, wallet)
            w.connect_slots(self.timer)
            # add to recently visited
            w.update_recently_visited(path)
            # initial configuration
            if self.config.get('hide_gui') is True and self.tray.isVisible():
                w.hide()
            else:
                w.show()
            self.windows.append(w)
            self.build_tray_menu()
            run_hook('on_new_window', w)

        if uri:
            w.pay_to_URI(uri)

        return w

    def close_window(self, window):
        self.windows.remove(window)
        self.build_tray_menu()
        # save wallet path of last open window
        if self.config.get('wallet_path') is None and not self.windows:
            path = window.wallet.storage.path
            self.config.set_key('gui_last_wallet', path)
        run_hook('on_close_window', window)

    def main(self):
        self.timer.start()
        # open last wallet
        if self.config.get('wallet_path') is None:
            last_wallet = self.config.get('gui_last_wallet')
            if last_wallet is not None and os.path.exists(last_wallet):
                self.config.cmdline_options['default_wallet_path'] = last_wallet

        if not self.start_new_window(self.config.get_wallet_path(),
                                     self.config.get('url')):
            return

        signal.signal(signal.SIGINT, lambda *args: self.app.quit())

        # main loop
        self.app.exec_()

        # Shut down the timer cleanly
        self.timer.stop()

        # clipboard persistence. see http://www.mail-archive.com/pyqt@riverbankcomputing.com/msg17328.html
        event = QtCore.QEvent(QtCore.QEvent.Clipboard)
        self.app.sendEvent(self.app.clipboard(), event)

        self.tray.hide()