anki/aqt/webview.py

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2019-02-05 04:59:03 +01:00
# Copyright: Ankitects Pty Ltd and contributors
# -*- coding: utf-8 -*-
# License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
import json
import sys
import math
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from anki.hooks import runHook
from aqt.qt import *
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from aqt.utils import openLink, tooltip
from anki.utils import isMac, isWin, isLin
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from anki.lang import _
# Page for debug messages
##########################################################################
class AnkiWebPage(QWebEnginePage):
def __init__(self, onBridgeCmd):
QWebEnginePage.__init__(self)
self._onBridgeCmd = onBridgeCmd
self._setupBridge()
def _setupBridge(self):
class Bridge(QObject):
@pyqtSlot(str, result=str)
def cmd(self, str):
return json.dumps(self.onCmd(str))
self._bridge = Bridge()
self._bridge.onCmd = self._onCmd
self._channel = QWebChannel(self)
self._channel.registerObject("py", self._bridge)
self.setWebChannel(self._channel)
js = QFile(':/qtwebchannel/qwebchannel.js')
assert js.open(QIODevice.ReadOnly)
js = bytes(js.readAll()).decode('utf-8')
script = QWebEngineScript()
script.setSourceCode(js + '''
var pycmd;
new QWebChannel(qt.webChannelTransport, function(channel) {
pycmd = function (arg, cb) {
var resultCB = function (res) {
// pass result back to user-provided callback
if (cb) {
cb(JSON.parse(res));
}
}
channel.objects.py.cmd(arg, resultCB);
return false;
}
pycmd("domDone");
});
''')
script.setWorldId(QWebEngineScript.MainWorld)
script.setInjectionPoint(QWebEngineScript.DocumentReady)
script.setRunsOnSubFrames(False)
self.profile().scripts().insert(script)
def javaScriptConsoleMessage(self, lvl, msg, line, srcID):
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# not translated because console usually not visible,
# and may only accept ascii text
sys.stdout.write("JS error on line %(a)d: %(b)s" %
dict(a=line, b=msg+"\n"))
def acceptNavigationRequest(self, url, navType, isMainFrame):
if not isMainFrame:
return True
# data: links generated by setHtml()
if url.scheme() == "data":
return True
# catch buggy <a href='#' onclick='func()'> links
from aqt import mw
if url.matches(QUrl(mw.serverURL()), QUrl.RemoveFragment):
print("onclick handler needs to return false")
return False
# load all other links in browser
openLink(url)
return False
def _onCmd(self, str):
return self._onBridgeCmd(str)
# Main web view
##########################################################################
class AnkiWebView(QWebEngineView):
def __init__(self, parent=None):
QWebEngineView.__init__(self, parent=parent)
self.title = "default"
self._page = AnkiWebPage(self._onBridgeCmd)
self._page.setBackgroundColor(self._getWindowColor()) # reduce flicker
self._domDone = True
self._pendingActions = []
self.requiresCol = True
self.setPage(self._page)
self._page.profile().setHttpCacheType(QWebEngineProfile.NoCache)
self.resetHandlers()
self.allowDrops = False
self._filterSet = False
QShortcut(QKeySequence("Esc"), self,
context=Qt.WidgetWithChildrenShortcut, activated=self.onEsc)
if isMac:
for key, fn in [
(QKeySequence.Copy, self.onCopy),
(QKeySequence.Paste, self.onPaste),
(QKeySequence.Cut, self.onCut),
(QKeySequence.SelectAll, self.onSelectAll),
]:
QShortcut(key, self,
context=Qt.WidgetWithChildrenShortcut,
activated=fn)
QShortcut(QKeySequence("ctrl+shift+v"), self,
context=Qt.WidgetWithChildrenShortcut, activated=self.onPaste)
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def eventFilter(self, obj, evt):
# disable pinch to zoom gesture
if isinstance(evt, QNativeGestureEvent):
return True
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elif evt.type() == QEvent.MouseButtonRelease:
if evt.button() == Qt.MidButton and isLin:
self.onMiddleClickPaste()
return True
return False
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return False
def onEsc(self):
w = self.parent()
while w:
if isinstance(w, QDialog) or isinstance(w, QMainWindow):
from aqt import mw
# esc in a child window closes the window
if w != mw:
w.close()
else:
# in the main window, removes focus from type in area
self.parent().setFocus()
break
w = w.parent()
def onCopy(self):
self.triggerPageAction(QWebEnginePage.Copy)
def onCut(self):
self.triggerPageAction(QWebEnginePage.Cut)
def onPaste(self):
self.triggerPageAction(QWebEnginePage.Paste)
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def onMiddleClickPaste(self):
self.triggerPageAction(QWebEnginePage.Paste)
def onSelectAll(self):
self.triggerPageAction(QWebEnginePage.SelectAll)
def contextMenuEvent(self, evt):
m = QMenu(self)
a = m.addAction(_("Copy"))
a.triggered.connect(self.onCopy)
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runHook("AnkiWebView.contextMenuEvent", self, m)
m.popup(QCursor.pos())
def dropEvent(self, evt):
pass
def setHtml(self, html):
self._queueAction("setHtml", html)
def _setHtml(self, html):
app = QApplication.instance()
oldFocus = app.focusWidget()
self._domDone = False
self._page.setHtml(html)
# work around webengine stealing focus on setHtml()
if oldFocus:
oldFocus.setFocus()
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def zoomFactor(self):
# overridden scale factor?
webscale = os.environ.get("ANKI_WEBSCALE")
if webscale:
return float(webscale)
if isMac:
return 1
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screen = QApplication.desktop().screen()
dpi = screen.logicalDpiX()
factor = dpi / 96.0
if isLin:
factor = max(1, factor)
return factor
# compensate for qt's integer scaling on windows
qtIntScale = self._getQtIntScale(screen)
desiredScale = factor * qtIntScale
newFactor = desiredScale / qtIntScale
return max(1, newFactor)
def _getQtIntScale(self, screen):
# try to detect if Qt has scaled the screen
# - qt will round the scale factor to a whole number, so a dpi of 125% = 1x,
# and a dpi of 150% = 2x
# - a screen with a normal physical dpi of 72 will have a dpi of 32
# if the scale factor has been rounded to 2x
# - different screens have different physical DPIs (eg 72, 93, 102)
# - until a better solution presents itself, assume a physical DPI at
# or above 70 is unscaled
if screen.physicalDpiX() > 70:
return 1
elif screen.physicalDpiX() > 35:
return 2
else:
return 3
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def _getWindowColor(self):
if isMac:
# standard palette does not return correct window color on macOS
return QColor("#ececec")
return self.style().standardPalette().color(QPalette.Window)
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def stdHtml(self, body, css=None, js=None, head=""):
if css is None:
css = []
if js is None:
js = ["jquery.js"]
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if isWin:
#T: include a font for your language on Windows, eg: "Segoe UI", "MS Mincho"
family = _('"Segoe UI"')
widgetspec = "button { font-size: 12px; font-family:%s; }" % family
fontspec = 'font-size:12px;font-family:%s;' % family
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elif isMac:
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family="Helvetica"
fontspec = 'font-size:15px;font-family:"%s";'% \
family
widgetspec = """
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button { font-size: 13px; -webkit-appearance: none; background: #fff; border: 1px solid #ccc;
border-radius:5px; font-family: Helvetica }"""
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else:
palette = self.style().standardPalette()
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family = self.font().family()
color_hl = palette.color(QPalette.Highlight).name()
color_hl_txt = palette.color(QPalette.HighlightedText).name()
color_btn = palette.color(QPalette.Button).name()
fontspec = 'font-size:14px;font-family:"%s";'% family
widgetspec = """
/* Buttons */
button{ font-size:14px; -webkit-appearance:none; outline:0;
background-color: %(color_btn)s; border:1px solid rgba(0,0,0,.2);
border-radius:2px; height:24px; font-family:"%(family)s"; }
button:focus{ border-color: %(color_hl)s }
button:hover{ background-color:#fff }
button:active, button:active:hover { background-color: %(color_hl)s; color: %(color_hl_txt)s;}
/* Input field focus outline */
textarea:focus, input:focus, input[type]:focus, .uneditable-input:focus,
div[contenteditable="true"]:focus {
outline: 0 none;
border-color: %(color_hl)s;
}""" % {"family": family, "color_btn": color_btn,
"color_hl": color_hl, "color_hl_txt": color_hl_txt}
csstxt = "\n".join([self.bundledCSS("webview.css")]+
[self.bundledCSS(fname) for fname in css])
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jstxt = "\n".join([self.bundledScript("webview.js")]+
[self.bundledScript(fname) for fname in js])
from aqt import mw
head = mw.baseHTML() + head + csstxt + jstxt
html = """
<!doctype html>
<html><head>
<title>{}</title>
<style>
body {{ zoom: {}; background: {}; {} }}
{}
</style>
{}
</head>
<body>{}</body>
</html>""".format(self.title, self.zoomFactor(), self._getWindowColor().name(),
fontspec, widgetspec, head, body)
#print(html)
self.setHtml(html)
def webBundlePath(self, path):
from aqt import mw
return "http://127.0.0.1:%d/_anki/%s" % (mw.mediaServer.getPort(), path)
def bundledScript(self, fname):
return '<script src="%s"></script>' % self.webBundlePath(fname)
def bundledCSS(self, fname):
return '<link rel="stylesheet" type="text/css" href="%s">' % self.webBundlePath(fname)
def eval(self, js):
self.evalWithCallback(js, None)
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def evalWithCallback(self, js, cb):
self._queueAction("eval", js, cb)
def _evalWithCallback(self, js, cb):
if cb:
def handler(val):
if self._shouldIgnoreWebEvent():
print("ignored late js callback", cb)
return
cb(val)
self.page().runJavaScript(js, handler)
else:
self.page().runJavaScript(js)
def _queueAction(self, name, *args):
self._pendingActions.append((name, args))
self._maybeRunActions()
def _maybeRunActions(self):
while self._pendingActions and self._domDone:
name, args = self._pendingActions.pop(0)
if name == "eval":
self._evalWithCallback(*args)
elif name == "setHtml":
self._setHtml(*args)
else:
raise Exception("unknown action: {}".format(name))
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def _openLinksExternally(self, url):
openLink(url)
def _shouldIgnoreWebEvent(self):
# async web events may be received after the profile has been closed
# or the underlying webview has been deleted
from aqt import mw
if sip.isdeleted(self):
return True
if not mw.col and self.requiresCol:
return True
return False
def _onBridgeCmd(self, cmd):
if not self._filterSet:
self.focusProxy().installEventFilter(self)
self._filterSet = True
if self._shouldIgnoreWebEvent():
print("ignored late bridge cmd", cmd)
return
if cmd == "domDone":
self._domDone = True
self._maybeRunActions()
else:
return self.onBridgeCmd(cmd)
def defaultOnBridgeCmd(self, cmd):
print("unhandled bridge cmd:", cmd)
def resetHandlers(self):
self.onBridgeCmd = self.defaultOnBridgeCmd
def adjustHeightToFit(self):
self.evalWithCallback("$(document.body).height()", self._onHeight)
def _onHeight(self, qvar):
if qvar is None:
tooltip(_("Error connecting to local port. Retrying..."))
from aqt import mw
mw.progress.timer(2000, mw.reset, False)
return
height = math.ceil(qvar*self.zoomFactor())
self.setFixedHeight(height)