295 lines
12 KiB
Python
295 lines
12 KiB
Python
# -*- coding: utf-8 -*-
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from ..Qt import QtGui, QtCore, QT_LIB
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if QT_LIB.startswith('PyQt'):
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from ..Qt import sip
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from .. import multiprocess as mp
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from .GraphicsView import GraphicsView
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from .. import CONFIG_OPTIONS
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import mmap, tempfile, os, atexit, sys, random
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__all__ = ['RemoteGraphicsView']
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class RemoteGraphicsView(QtGui.QWidget):
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"""
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Replacement for GraphicsView that does all scene management and rendering on a remote process,
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while displaying on the local widget.
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GraphicsItems must be created by proxy to the remote process.
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"""
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def __init__(self, parent=None, *args, **kwds):
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"""
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The keyword arguments 'useOpenGL' and 'backgound', if specified, are passed to the remote
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GraphicsView.__init__(). All other keyword arguments are passed to multiprocess.QtProcess.__init__().
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"""
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self._img = None
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self._imgReq = None
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self._sizeHint = (640,480) ## no clue why this is needed, but it seems to be the default sizeHint for GraphicsView.
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## without it, the widget will not compete for space against another GraphicsView.
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QtGui.QWidget.__init__(self)
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# separate local keyword arguments from remote.
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remoteKwds = {}
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for kwd in ['useOpenGL', 'background']:
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if kwd in kwds:
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remoteKwds[kwd] = kwds.pop(kwd)
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self._proc = mp.QtProcess(**kwds)
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self.pg = self._proc._import('pyqtgraph')
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self.pg.setConfigOptions(**CONFIG_OPTIONS)
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rpgRemote = self._proc._import('pyqtgraph.widgets.RemoteGraphicsView')
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self._view = rpgRemote.Renderer(*args, **remoteKwds)
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self._view._setProxyOptions(deferGetattr=True)
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self.setFocusPolicy(QtCore.Qt.FocusPolicy.StrongFocus)
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self.setSizePolicy(QtGui.QSizePolicy.Policy.Expanding, QtGui.QSizePolicy.Policy.Expanding)
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self.setMouseTracking(True)
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self.shm = None
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shmFileName = self._view.shmFileName()
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if sys.platform.startswith('win'):
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self.shmtag = shmFileName
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else:
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self.shmFile = open(shmFileName, 'r')
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self._view.sceneRendered.connect(mp.proxy(self.remoteSceneChanged)) #, callSync='off'))
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## Note: we need synchronous signals
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## even though there is no return value--
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## this informs the renderer that it is
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## safe to begin rendering again.
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for method in ['scene', 'setCentralItem']:
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setattr(self, method, getattr(self._view, method))
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def resizeEvent(self, ev):
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ret = super().resizeEvent(ev)
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self._view.resize(self.size(), _callSync='off')
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return ret
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def sizeHint(self):
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return QtCore.QSize(*self._sizeHint)
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def remoteSceneChanged(self, data):
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w, h, size, newfile = data
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#self._sizeHint = (whint, hhint)
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if self.shm is None or self.shm.size != size:
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if self.shm is not None:
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self.shm.close()
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if sys.platform.startswith('win'):
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self.shmtag = newfile ## on windows, we create a new tag for every resize
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self.shm = mmap.mmap(-1, size, self.shmtag) ## can't use tmpfile on windows because the file can only be opened once.
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else:
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self.shm = mmap.mmap(self.shmFile.fileno(), size, mmap.MAP_SHARED, mmap.PROT_READ)
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self._img = QtGui.QImage(self.shm, w, h, QtGui.QImage.Format.Format_RGB32).copy()
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self.update()
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def paintEvent(self, ev):
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if self._img is None:
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return
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p = QtGui.QPainter(self)
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p.drawImage(self.rect(), self._img, self._img.rect())
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p.end()
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def serialize_mouse_enum(self, *args):
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# PyQt6 can pickle enums and flags but cannot cast to int
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# PyQt5 5.12, PyQt5 5.15, PySide2 5.15, PySide6 can pickle enums but not flags
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# PySide2 5.12 cannot pickle enums nor flags
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# MouseButtons and KeyboardModifiers are flags
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if QT_LIB != 'PyQt6':
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args = [int(x) for x in args]
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return args
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def serialize_mouse_event(self, ev):
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lpos = ev.position() if hasattr(ev, 'position') else ev.localPos()
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gpos = ev.globalPosition() if hasattr(ev, 'globalPosition') else ev.screenPos()
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typ, btn, btns, mods = self.serialize_mouse_enum(
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ev.type(), ev.button(), ev.buttons(), ev.modifiers())
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return (typ, lpos, gpos, btn, btns, mods)
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def serialize_wheel_event(self, ev):
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# {PyQt6, PySide6} have position()
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# {PyQt5, PySide2} 5.15 have position()
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# {PyQt5, PySide2} 5.15 have posF() (contrary to C++ docs)
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# {PyQt5, PySide2} 5.12 have posF()
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lpos = ev.position() if hasattr(ev, 'position') else ev.posF()
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# gpos = ev.globalPosition() if hasattr(ev, 'globalPosition') else ev.globalPosF()
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gpos = lpos # RemoteGraphicsView Renderer assumes to be at (0, 0)
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btns, mods, phase = self.serialize_mouse_enum(ev.buttons(), ev.modifiers(), ev.phase())
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return (lpos, gpos, ev.pixelDelta(), ev.angleDelta(), btns, mods, phase, ev.inverted())
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def mousePressEvent(self, ev):
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self._view.mousePressEvent(self.serialize_mouse_event(ev), _callSync='off')
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ev.accept()
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return super().mousePressEvent(ev)
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def mouseReleaseEvent(self, ev):
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self._view.mouseReleaseEvent(self.serialize_mouse_event(ev), _callSync='off')
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ev.accept()
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return super().mouseReleaseEvent(ev)
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def mouseMoveEvent(self, ev):
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self._view.mouseMoveEvent(self.serialize_mouse_event(ev), _callSync='off')
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ev.accept()
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return super().mouseMoveEvent(ev)
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def wheelEvent(self, ev):
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self._view.wheelEvent(self.serialize_wheel_event(ev), _callSync='off')
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ev.accept()
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return super().wheelEvent(ev)
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def enterEvent(self, ev):
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lpos = ev.position() if hasattr(ev, 'position') else ev.localPos()
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wpos = ev.scenePosition() if hasattr(ev, 'scenePosition') else ev.windowPos()
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gpos = ev.globalPosition() if hasattr(ev, 'globalPosition') else ev.screenPos()
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lws = lpos, wpos, gpos
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self._view.enterEvent(lws, _callSync='off')
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return super().enterEvent(ev)
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def leaveEvent(self, ev):
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typ, = self.serialize_mouse_enum(ev.type())
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self._view.leaveEvent(typ, _callSync='off')
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return super().leaveEvent(ev)
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def remoteProcess(self):
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"""Return the remote process handle. (see multiprocess.remoteproxy.RemoteEventHandler)"""
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return self._proc
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def close(self):
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"""Close the remote process. After this call, the widget will no longer be updated."""
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self._view.sceneRendered.disconnect()
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self._proc.close()
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class Renderer(GraphicsView):
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## Created by the remote process to handle render requests
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sceneRendered = QtCore.Signal(object)
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def __init__(self, *args, **kwds):
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## Create shared memory for rendered image
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#pg.dbg(namespace={'r': self})
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if sys.platform.startswith('win'):
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self.shmtag = "pyqtgraph_shmem_" + ''.join([chr((random.getrandbits(20)%25) + 97) for i in range(20)])
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self.shm = mmap.mmap(-1, mmap.PAGESIZE, self.shmtag) # use anonymous mmap on windows
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else:
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self.shmFile = tempfile.NamedTemporaryFile(prefix='pyqtgraph_shmem_')
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self.shmFile.write(b'\x00' * (mmap.PAGESIZE+1))
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self.shmFile.flush()
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fd = self.shmFile.fileno()
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self.shm = mmap.mmap(fd, mmap.PAGESIZE, mmap.MAP_SHARED, mmap.PROT_WRITE)
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atexit.register(self.close)
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GraphicsView.__init__(self, *args, **kwds)
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self.scene().changed.connect(self.update)
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self.img = None
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self.renderTimer = QtCore.QTimer()
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self.renderTimer.timeout.connect(self.renderView)
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self.renderTimer.start(16)
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def close(self):
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self.shm.close()
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if not sys.platform.startswith('win'):
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self.shmFile.close()
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def shmFileName(self):
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if sys.platform.startswith('win'):
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return self.shmtag
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else:
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return self.shmFile.name
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def update(self):
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self.img = None
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return super().update()
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def resize(self, size):
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oldSize = self.size()
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super().resize(size)
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self.resizeEvent(QtGui.QResizeEvent(size, oldSize))
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self.update()
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def renderView(self):
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if self.img is None:
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## make sure shm is large enough and get its address
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if self.width() == 0 or self.height() == 0:
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return
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dpr = self.devicePixelRatioF()
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iwidth = int(self.width() * dpr)
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iheight = int(self.height() * dpr)
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size = iwidth * iheight * 4
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if size > self.shm.size():
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if sys.platform.startswith('win'):
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## windows says "WindowsError: [Error 87] the parameter is incorrect" if we try to resize the mmap
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self.shm.close()
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## it also says (sometimes) 'access is denied' if we try to reuse the tag.
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self.shmtag = "pyqtgraph_shmem_" + ''.join([chr((random.getrandbits(20)%25) + 97) for i in range(20)])
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self.shm = mmap.mmap(-1, size, self.shmtag)
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elif sys.platform == 'darwin':
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self.shm.close()
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fd = self.shmFile.fileno()
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os.ftruncate(fd, size + 1)
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self.shm = mmap.mmap(fd, size, mmap.MAP_SHARED, mmap.PROT_WRITE)
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else:
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self.shm.resize(size)
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## render the scene directly to shared memory
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# see functions.py::makeQImage() for rationale
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if QT_LIB.startswith('PyQt'):
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# PyQt5, PyQt6 >= 6.0.1
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img_ptr = int(sip.voidptr(self.shm))
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else:
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# PySide2, PySide6
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img_ptr = self.shm
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self.img = QtGui.QImage(img_ptr, iwidth, iheight, QtGui.QImage.Format.Format_RGB32)
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self.img.setDevicePixelRatio(dpr)
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self.img.fill(0xffffffff)
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p = QtGui.QPainter(self.img)
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self.render(p, self.viewRect(), self.rect())
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p.end()
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self.sceneRendered.emit((iwidth, iheight, self.shm.size(), self.shmFileName()))
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def deserialize_mouse_event(self, mouse_event):
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typ, pos, gpos, btn, btns, mods = mouse_event
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typ = QtCore.QEvent.Type(typ)
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if QT_LIB != 'PyQt6':
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btn = QtCore.Qt.MouseButton(btn)
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btns = QtCore.Qt.MouseButtons(btns)
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mods = QtCore.Qt.KeyboardModifiers(mods)
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return QtGui.QMouseEvent(typ, pos, gpos, btn, btns, mods)
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def deserialize_wheel_event(self, wheel_event):
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pos, gpos, pixelDelta, angleDelta, btns, mods, phase, inverted = wheel_event
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if QT_LIB != 'PyQt6':
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btns = QtCore.Qt.MouseButtons(btns)
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mods = QtCore.Qt.KeyboardModifiers(mods)
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phase = QtCore.Qt.ScrollPhase(phase)
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return QtGui.QWheelEvent(pos, gpos, pixelDelta, angleDelta, btns, mods, phase, inverted)
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def mousePressEvent(self, mouse_event):
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ev = self.deserialize_mouse_event(mouse_event)
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return super().mousePressEvent(ev)
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def mouseMoveEvent(self, mouse_event):
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ev = self.deserialize_mouse_event(mouse_event)
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return super().mouseMoveEvent(ev)
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def mouseReleaseEvent(self, mouse_event):
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ev = self.deserialize_mouse_event(mouse_event)
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return super().mouseReleaseEvent(ev)
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def wheelEvent(self, wheel_event):
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ev = self.deserialize_wheel_event(wheel_event)
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return super().wheelEvent(ev)
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def enterEvent(self, lws):
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ev = QtGui.QEnterEvent(*lws)
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return super().enterEvent(ev)
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def leaveEvent(self, typ):
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typ = QtCore.QEvent.Type(typ)
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ev = QtCore.QEvent(typ)
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return super().leaveEvent(ev)
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