matplotlib/lib/matplotlib/backends/backend_qt4.py at master · feisuo/matplotlib · GitHub

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from __future__ import (absolute_import, division, print_function,

unicode_literals)

import six

from six import unichr

import os

import re

import signal

import sys

import matplotlib

from matplotlib.cbook import is_string_like

from matplotlib.backend_bases import FigureManagerBase

from matplotlib.backend_bases import FigureCanvasBase

from matplotlib.backend_bases import NavigationToolbar2

from matplotlib.backend_bases import cursors

from matplotlib.backend_bases import TimerBase

from matplotlib.backend_bases import ShowBase

from matplotlib._pylab_helpers import Gcf

from matplotlib.figure import Figure

from matplotlib.widgets import SubplotTool

from .qt_compat import QtCore, QtWidgets, _getSaveFileName, __version__

from matplotlib.backends.qt_editor.formsubplottool import UiSubplotTool

from .backend_qt5 import (backend_version, SPECIAL_KEYS, SUPER, ALT, CTRL,

SHIFT, MODIFIER_KEYS, fn_name, cursord,

draw_if_interactive, _create_qApp, show, TimerQT,

MainWindow, FigureManagerQT, NavigationToolbar2QT,

SubplotToolQt, error_msg_qt, exception_handler)

from .backend_qt5 import FigureCanvasQT as FigureCanvasQT5

DEBUG = False

def new_figure_manager(num, *args, **kwargs):

"""

Create a new figure manager instance

"""

thisFig = Figure(*args, **kwargs)

return new_figure_manager_given_figure(num, thisFig)

def new_figure_manager_given_figure(num, figure):

"""

Create a new figure manager instance for the given figure.

"""

canvas = FigureCanvasQT(figure)

manager = FigureManagerQT(canvas, num)

return manager

class FigureCanvasQT(FigureCanvasQT5):

def __init__(self, figure):

if DEBUG:

print('FigureCanvasQt qt4: ', figure)

_create_qApp()

# Note different super-calling style to backend_qt5

QtWidgets.QWidget.__init__(self)

FigureCanvasBase.__init__(self, figure)

self.figure = figure

self.setMouseTracking(True)

self._idle = True

w, h = self.get_width_height()

self.resize(w, h)

# Key auto-repeat enabled by default

self._keyautorepeat = True

def wheelEvent(self, event):

x = event.x()

# flipy so y=0 is bottom of canvas

y = self.figure.bbox.height - event.y()

# from QWheelEvent::delta doc

steps = event.delta()/120

if (event.orientation() == QtCore.Qt.Vertical):

FigureCanvasBase.scroll_event(self, x, y, steps)

if DEBUG:

print('scroll event: delta = %i, '

'steps = %i ' % (event.delta(), steps))

FigureCanvas = FigureCanvasQT

FigureManager = FigureManagerQT

matplotlib/lib/matplotlib/backends/backend_qt4.py at master · feisuo/matplotlib · GitHub

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