PyBitmessage/src/bitmessageqt/messageview.py

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"""
src/bitmessageqt/messageview.py
===============================
"""
from PyQt4 import QtCore, QtGui
from safehtmlparser import SafeHTMLParser
class MessageView(QtGui.QTextBrowser):
"""Message content viewer class, can switch between plaintext and HTML"""
MODE_PLAIN = 0
MODE_HTML = 1
def __init__(self, parent=0):
super(MessageView, self).__init__(parent)
self.mode = MessageView.MODE_PLAIN
self.html = None
self.setOpenExternalLinks(False)
self.setOpenLinks(False)
self.anchorClicked.connect(self.confirmURL)
self.out = ""
self.outpos = 0
self.document().setUndoRedoEnabled(False)
self.rendering = False
self.defaultFontPointSize = self.currentFont().pointSize()
self.verticalScrollBar().valueChanged.connect(self.lazyRender)
self.setWrappingWidth()
def resizeEvent(self, event):
"""View resize event handler"""
super(MessageView, self).resizeEvent(event)
self.setWrappingWidth(event.size().width())
def mousePressEvent(self, event):
"""Mouse press button event handler"""
if event.button() == QtCore.Qt.LeftButton and self.html and self.html.has_html and self.cursorForPosition(
event.pos()).block().blockNumber() == 0:
if self.mode == MessageView.MODE_PLAIN:
self.showHTML()
else:
self.showPlain()
else:
super(MessageView, self).mousePressEvent(event)
def wheelEvent(self, event):
"""Mouse wheel scroll event handler"""
# super will actually automatically take care of zooming
super(MessageView, self).wheelEvent(event)
if (QtGui.QApplication.queryKeyboardModifiers() &
QtCore.Qt.ControlModifier) == QtCore.Qt.ControlModifier and event.orientation() == QtCore.Qt.Vertical:
zoom = self.currentFont().pointSize() * 100 / self.defaultFontPointSize
QtGui.QApplication.activeWindow().statusBar().showMessage(
QtGui.QApplication.translate("MainWindow", "Zoom level %1%").arg(str(zoom)))
def setWrappingWidth(self, width=None):
"""Set word-wrapping width"""
self.setLineWrapMode(QtGui.QTextEdit.FixedPixelWidth)
if width is None:
width = self.width()
self.setLineWrapColumnOrWidth(width)
def confirmURL(self, link):
"""Show a dialog requesting URL opening confirmation"""
if link.scheme() == "mailto":
window = QtGui.QApplication.activeWindow()
window.ui.lineEditTo.setText(link.path())
if link.hasQueryItem("subject"):
window.ui.lineEditSubject.setText(
link.queryItemValue("subject"))
if link.hasQueryItem("body"):
window.ui.textEditMessage.setText(
link.queryItemValue("body"))
window.setSendFromComboBox()
window.ui.tabWidgetSend.setCurrentIndex(0)
window.ui.tabWidget.setCurrentIndex(
window.ui.tabWidget.indexOf(window.ui.send)
)
window.ui.textEditMessage.setFocus()
return
reply = QtGui.QMessageBox.warning(
self,
QtGui.QApplication.translate(
"MessageView",
"Follow external link"),
QtGui.QApplication.translate(
"MessageView",
"The link \"%1\" will open in a browser. It may be a security risk, it could de-anonymise you"
" or download malicious data. Are you sure?").arg(unicode(link.toString())),
QtGui.QMessageBox.Yes,
QtGui.QMessageBox.No)
if reply == QtGui.QMessageBox.Yes:
QtGui.QDesktopServices.openUrl(link)
def loadResource(self, restype, name):
"""
Callback for loading referenced objects, such as an image. For security reasons at the moment doesn't do
anything)
"""
pass
def lazyRender(self):
"""
Partially render a message. This is to avoid UI freezing when loading huge messages. It continues loading as
you scroll down.
"""
if self.rendering:
return
self.rendering = True
position = self.verticalScrollBar().value()
cursor = QtGui.QTextCursor(self.document())
while self.outpos < len(self.out) and self.verticalScrollBar().value(
) >= self.document().size().height() - 2 * self.size().height():
startpos = self.outpos
self.outpos += 10240
# find next end of tag
if self.mode == MessageView.MODE_HTML:
pos = self.out.find(">", self.outpos)
if pos > self.outpos:
self.outpos = pos + 1
cursor.movePosition(QtGui.QTextCursor.End, QtGui.QTextCursor.MoveAnchor)
cursor.insertHtml(QtCore.QString(self.out[startpos:self.outpos]))
self.verticalScrollBar().setValue(position)
self.rendering = False
def showPlain(self):
"""Render message as plain text."""
self.mode = MessageView.MODE_PLAIN
out = self.html.raw
if self.html.has_html:
out = "<div align=\"center\" style=\"text-decoration: underline;\"><b>" + unicode(
QtGui.QApplication.translate(
"MessageView", "HTML detected, click here to display")) + "</b></div><br/>" + out
self.out = out
self.outpos = 0
self.setHtml("")
self.lazyRender()
def showHTML(self):
"""Render message as HTML"""
self.mode = MessageView.MODE_HTML
out = self.html.sanitised
out = "<div align=\"center\" style=\"text-decoration: underline;\"><b>" + unicode(
QtGui.QApplication.translate("MessageView", "Click here to disable HTML")) + "</b></div><br/>" + out
self.out = out
self.outpos = 0
self.setHtml("")
self.lazyRender()
def setContent(self, data):
"""Set message content from argument"""
self.html = SafeHTMLParser()
self.html.reset()
self.html.reset_safe()
self.html.allow_picture = True
self.html.feed(data)
self.html.close()
self.showPlain()