/usr/lib/python3/dist-packages/ginga/qtw/ImageViewQt.py is in python3-ginga 2.6.1-2.
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# ImageViewQt.py -- a backend for Ginga using Qt widgets
#
# This is open-source software licensed under a BSD license.
# Please see the file LICENSE.txt for details.
#
import sys, os
import math
import numpy
from io import BytesIO
from ginga.qtw.QtHelp import QtGui, QtCore, QFont, QColor, QImage, \
QPixmap, QCursor, QPainter, have_pyqt5, Timer, get_scroll_info
from ginga import ImageView, Mixins, Bindings
import ginga.util.six as six
from ginga.util.six.moves import map, zip
from ginga.qtw.CanvasRenderQt import CanvasRenderer
from ginga.util.paths import icondir
class ImageViewQtError(ImageView.ImageViewError):
pass
class RenderGraphicsView(QtGui.QGraphicsView):
def __init__(self, *args, **kwdargs):
super(RenderGraphicsView, self).__init__(*args, **kwdargs)
self.viewer = None
self.pixmap = None
def drawBackground(self, painter, rect):
"""When an area of the window is exposed, we just copy out of the
server-side, off-screen pixmap to that area.
"""
if not self.pixmap:
return
x1, y1, x2, y2 = rect.getCoords()
width = x2 - x1
height = y2 - y1
# redraw the screen from backing pixmap
rect = QtCore.QRect(x1, y1, width, height)
painter.drawPixmap(rect, self.pixmap, rect)
def resizeEvent(self, event):
rect = self.geometry()
x1, y1, x2, y2 = rect.getCoords()
width = x2 - x1
height = y2 - y1
self.viewer.configure_window(width, height)
def sizeHint(self):
width, height = 300, 300
if self.viewer is not None:
width, height = self.viewer.get_desired_size()
return QtCore.QSize(width, height)
def set_pixmap(self, pixmap):
self.pixmap = pixmap
class RenderWidget(QtGui.QWidget):
def __init__(self, *args, **kwdargs):
super(RenderWidget, self).__init__(*args, **kwdargs)
self.viewer = None
self.pixmap = None
self.setAttribute(QtCore.Qt.WA_OpaquePaintEvent)
def paintEvent(self, event):
"""When an area of the window is exposed, we just copy out of the
server-side, off-screen pixmap to that area.
"""
if not self.pixmap:
return
rect = event.rect()
x1, y1, x2, y2 = rect.getCoords()
width = x2 - x1
height = y2 - y1
# redraw the screen from backing pixmap
painter = QPainter(self)
rect = QtCore.QRect(x1, y1, width, height)
painter.drawPixmap(rect, self.pixmap, rect)
def resizeEvent(self, event):
rect = self.geometry()
x1, y1, x2, y2 = rect.getCoords()
width = x2 - x1
height = y2 - y1
self.viewer.configure_window(width, height)
#self.update()
def sizeHint(self):
width, height = 300, 300
if self.viewer is not None:
width, height = self.viewer.get_desired_size()
return QtCore.QSize(width, height)
def set_pixmap(self, pixmap):
self.pixmap = pixmap
class ImageViewQt(ImageView.ImageViewBase):
def __init__(self, logger=None, rgbmap=None, settings=None, render=None):
ImageView.ImageViewBase.__init__(self, logger=logger,
rgbmap=rgbmap, settings=settings)
if render is None:
render = 'widget'
self.wtype = render
if self.wtype == 'widget':
self.imgwin = RenderWidget()
elif self.wtype == 'scene':
self.scene = QtGui.QGraphicsScene()
self.imgwin = RenderGraphicsView(self.scene)
else:
raise ImageViewQtError("Undefined render type: '%s'" % (render))
self.imgwin.viewer = self
self.pixmap = None
# Qt expects 32bit BGRA data for color images
self._rgb_order = 'BGRA'
self.renderer = CanvasRenderer(self)
self.msgtimer = Timer(0.0, lambda timer: self.onscreen_message_off())
# For optomized redrawing
self._defer_task = Timer(0.0, lambda timer: self.delayed_redraw())
def get_widget(self):
return self.imgwin
def _render_offscreen(self, drawable, data, dst_x, dst_y,
width, height):
# NOTE [A]
daht, dawd, depth = data.shape
self.logger.debug("data shape is %dx%dx%d" % (dawd, daht, depth))
# Get qimage for copying pixel data
qimage = self._get_qimage(data)
painter = QPainter(drawable)
painter.setWorldMatrixEnabled(True)
# fill pixmap with background color
imgwin_wd, imgwin_ht = self.get_window_size()
bgclr = self._get_color(*self.img_bg)
painter.fillRect(QtCore.QRect(0, 0, imgwin_wd, imgwin_ht),
bgclr)
# draw image data from buffer to offscreen pixmap
painter.drawImage(QtCore.QRect(dst_x, dst_y, width, height),
qimage,
QtCore.QRect(0, 0, width, height))
def render_image(self, rgbobj, dst_x, dst_y):
"""Render the image represented by (rgbobj) at dst_x, dst_y
in the pixel space.
"""
self.logger.debug("redraw pixmap=%s" % (self.pixmap))
if self.pixmap is None:
return
self.logger.debug("drawing to pixmap")
# Prepare array for rendering
arr = rgbobj.get_array(self._rgb_order)
(height, width) = arr.shape[:2]
return self._render_offscreen(self.pixmap, arr, dst_x, dst_y,
width, height)
def configure_window(self, width, height):
self.logger.debug("window size reconfigured to %dx%d" % (
width, height))
if hasattr(self, 'scene'):
# By default, a QGraphicsView comes with a 1-pixel margin
# You will get scrollbars unless you account for this
# See http://stackoverflow.com/questions/3513788/qt-qgraphicsview-without-scrollbar
width, height = width - 2, height - 2
self.scene.setSceneRect(1, 1, width-2, height-2)
# If we need to build a new pixmap do it here. We allocate one
# twice as big as necessary to prevent having to reinstantiate it
# all the time. On Qt this causes unpleasant flashing in the display.
if (self.pixmap is None) or (self.pixmap.width() < width) or \
(self.pixmap.height() < height):
pixmap = QPixmap(width*2, height*2)
#pixmap.fill(QColor("black"))
self.pixmap = pixmap
self.imgwin.set_pixmap(pixmap)
self.configure(width, height)
def get_rgb_image_as_buffer(self, output=None, format='png',
quality=90):
ibuf = output
if ibuf is None:
ibuf = BytesIO()
imgwin_wd, imgwin_ht = self.get_window_size()
qpix = self.pixmap.copy(0, 0,
imgwin_wd, imgwin_ht)
qbuf = QtCore.QBuffer()
qbuf.open(QtCore.QIODevice.ReadWrite)
qpix.save(qbuf, format=format, quality=quality)
ibuf.write(bytes(qbuf.data()))
qbuf.close()
return ibuf
def get_rgb_image_as_widget(self, output=None, format='png',
quality=90):
imgwin_wd, imgwin_ht = self.get_window_size()
qpix = self.pixmap.copy(0, 0,
imgwin_wd, imgwin_ht)
return qpix.toImage()
def save_rgb_image_as_file(self, filepath, format='png', quality=90):
qimg = self.get_rgb_image_as_widget()
res = qimg.save(filepath, format=format, quality=quality)
def get_plain_image_as_widget(self):
"""Used for generating thumbnails. Does not include overlaid
graphics.
"""
arr = self.getwin_array(order=self._rgb_order)
image = self._get_qimage(arr)
return image
def save_plain_image_as_file(self, filepath, format='png', quality=90):
"""Used for generating thumbnails. Does not include overlaid
graphics.
"""
qimg = self.get_plain_image_as_widget()
res = qimg.save(filepath, format=format, quality=quality)
def reschedule_redraw(self, time_sec):
self._defer_task.cancel()
self._defer_task.start(time_sec)
def update_image(self):
if (not self.pixmap) or (not self.imgwin):
return
self.logger.debug("updating window from pixmap")
if hasattr(self, 'scene'):
imgwin_wd, imgwin_ht = self.get_window_size()
self.scene.invalidate(0, 0, imgwin_wd, imgwin_ht,
QtGui.QGraphicsScene.BackgroundLayer)
else:
self.imgwin.update()
#self.imgwin.show()
def set_cursor(self, cursor):
if self.imgwin is not None:
self.imgwin.setCursor(cursor)
def make_cursor(self, iconpath, x, y):
image = QImage()
image.load(iconpath)
pm = QPixmap(image)
return QCursor(pm, x, y)
def center_cursor(self):
if self.imgwin is None:
return
win_x, win_y = self.get_center()
w_pt = QtCore.QPoint(win_x, win_y)
s_pt = self.imgwin.mapToGlobal(w_pt)
# set the cursor position
cursor = self.imgwin.cursor()
cursor.setPos(s_pt)
def position_cursor(self, data_x, data_y):
if self.imgwin is None:
return
win_x, win_y = self.get_canvas_xy(data_x, data_y)
w_pt = QtCore.QPoint(win_x, win_y)
s_pt = self.imgwin.mapToGlobal(w_pt)
# set the cursor position
cursor = self.imgwin.cursor()
cursor.setPos(s_pt)
def get_rgb_order(self):
return self._rgb_order
def _get_qimage(self, bgra):
h, w, channels = bgra.shape
fmt = QImage.Format_ARGB32
result = QImage(bgra.data, w, h, fmt)
# Need to hang on to a reference to the array
result.ndarray = bgra
return result
def _get_color(self, r, g, b):
n = 255.0
clr = QColor(int(r*n), int(g*n), int(b*n))
return clr
def onscreen_message(self, text, delay=None, redraw=True):
self.msgtimer.cancel()
self.set_onscreen_message(text, redraw=redraw)
if delay is not None:
self.msgtimer.start(delay)
class RenderMixin(object):
def showEvent(self, event):
self.viewer.map_event(self, event)
def focusInEvent(self, event):
self.viewer.focus_event(self, event, True)
def focusOutEvent(self, event):
self.viewer.focus_event(self, event, False)
def enterEvent(self, event):
self.viewer.enter_notify_event(self, event)
def leaveEvent(self, event):
self.viewer.leave_notify_event(self, event)
def keyPressEvent(self, event):
# without this we do not get key release events if the focus
# changes to another window
#self.grabKeyboard()
self.viewer.key_press_event(self, event)
def keyReleaseEvent(self, event):
#self.releaseKeyboard()
self.viewer.key_release_event(self, event)
def mousePressEvent(self, event):
self.viewer.button_press_event(self, event)
def mouseReleaseEvent(self, event):
self.viewer.button_release_event(self, event)
def mouseMoveEvent(self, event):
self.viewer.motion_notify_event(self, event)
def wheelEvent(self, event):
self.viewer.scroll_event(self, event)
def event(self, event):
# This method is a hack necessary to support trackpad gestures
# on Qt4 because it does not support specific method overrides.
# Instead we have to override the generic event handler, look
# explicitly for gesture events.
if event.type() == QtCore.QEvent.Gesture:
return self.viewer.gesture_event(self, event)
return super(RenderMixin, self).event(event)
def dragEnterEvent(self, event):
# if event.mimeData().hasFormat('text/plain'):
# event.accept()
# else:
# event.ignore()
event.accept()
def dragMoveEvent(self, event):
# if event.mimeData().hasFormat('text/plain'):
# event.accept()
# else:
# event.ignore()
event.accept()
def dropEvent(self, event):
self.viewer.drop_event(self, event)
class RenderWidgetZoom(RenderMixin, RenderWidget):
pass
class RenderGraphicsViewZoom(RenderMixin, RenderGraphicsView):
pass
class ImageViewEvent(ImageViewQt):
def __init__(self, logger=None, rgbmap=None, settings=None, render=None):
ImageViewQt.__init__(self, logger=logger, rgbmap=rgbmap,
settings=settings, render=render)
# replace the widget our parent provided
if self.wtype == 'scene':
imgwin = RenderGraphicsViewZoom()
imgwin.setScene(self.scene)
else:
imgwin = RenderWidgetZoom()
imgwin.viewer = self
self.imgwin = imgwin
imgwin.setFocusPolicy(QtCore.Qt.FocusPolicy(
QtCore.Qt.TabFocus |
QtCore.Qt.ClickFocus |
QtCore.Qt.StrongFocus |
QtCore.Qt.WheelFocus))
imgwin.setMouseTracking(True)
imgwin.setAcceptDrops(True)
# enable gesture handling
imgwin.grabGesture(QtCore.Qt.PinchGesture)
# Some of these are not well supported (read "just don't get
# recognized") by Qt and aren't the same as standard platform
# trackpad gestures anyway
#imgwin.grabGesture(QtCore.Qt.PanGesture)
#imgwin.grabGesture(QtCore.Qt.SwipeGesture)
#imgwin.grabGesture(QtCore.Qt.TapGesture)
#imgwin.grabGesture(QtCore.Qt.TapAndHoldGesture)
# Does widget accept focus when mouse enters window
self.enter_focus = self.t_.get('enter_focus', True)
# Define cursors
for curname, filename in (('pan', 'openHandCursor.png'),
('pick', 'thinCrossCursor.png')):
path = os.path.join(icondir, filename)
cur = self.make_cursor(path, 8, 8)
self.define_cursor(curname, cur)
# @$%&^(_)*&^ qt!!
self._keytbl = {
'`': 'backquote',
'"': 'doublequote',
"'": 'singlequote',
'\\': 'backslash',
' ': 'space',
}
self._fnkeycodes = [QtCore.Qt.Key_F1, QtCore.Qt.Key_F2,
QtCore.Qt.Key_F3, QtCore.Qt.Key_F4,
QtCore.Qt.Key_F5, QtCore.Qt.Key_F6,
QtCore.Qt.Key_F7, QtCore.Qt.Key_F8,
QtCore.Qt.Key_F9, QtCore.Qt.Key_F10,
QtCore.Qt.Key_F11, QtCore.Qt.Key_F12,
]
for name in ('motion', 'button-press', 'button-release',
'key-press', 'key-release', 'drag-drop',
'scroll', 'map', 'focus', 'enter', 'leave',
'pinch', 'pan', 'swipe', 'tap'):
self.enable_callback(name)
def transkey(self, keycode, keyname):
self.logger.debug("keycode=%d keyname='%s'" % (
keycode, keyname))
if keycode in [QtCore.Qt.Key_Control]:
return 'control_l'
if keycode in [QtCore.Qt.Key_Shift]:
return 'shift_l'
if keycode in [QtCore.Qt.Key_Alt]:
return 'alt_l'
if keycode in [QtCore.Qt.Key_Up]:
return 'up'
if keycode in [QtCore.Qt.Key_Down]:
return 'down'
if keycode in [QtCore.Qt.Key_Left]:
return 'left'
if keycode in [QtCore.Qt.Key_Right]:
return 'right'
if keycode in [QtCore.Qt.Key_PageUp]:
return 'page_up'
if keycode in [QtCore.Qt.Key_PageDown]:
return 'page_down'
if keycode in [QtCore.Qt.Key_Home]:
return 'home'
if keycode in [QtCore.Qt.Key_End]:
return 'end'
if keycode in [QtCore.Qt.Key_Insert]:
return 'insert'
if keycode in [QtCore.Qt.Key_Delete]:
return 'delete'
# if keycode in [QtCore.Qt.Key_Super_L]:
# return 'super_l'
# if keycode in [QtCore.Qt.Key_Super_R]:
# return 'super_r'
if keycode in [QtCore.Qt.Key_Escape]:
return 'escape'
# Control key on Mac keyboards and "Windows" key under Linux
if keycode in [16777250]:
return 'meta_right'
if keycode in self._fnkeycodes:
index = self._fnkeycodes.index(keycode)
return 'f%d' % (index+1)
try:
return self._keytbl[keyname.lower()]
except KeyError:
return keyname
def get_keyTable(self):
return self._keytbl
def set_enter_focus(self, tf):
self.enter_focus = tf
def map_event(self, widget, event):
rect = widget.geometry()
x1, y1, x2, y2 = rect.getCoords()
width = x2 - x1
height = y2 - y1
self.configure_window(width, height)
return self.make_callback('map')
def focus_event(self, widget, event, hasFocus):
return self.make_callback('focus', hasFocus)
def enter_notify_event(self, widget, event):
if self.enter_focus:
widget.setFocus()
return self.make_callback('enter')
def leave_notify_event(self, widget, event):
self.logger.debug("leaving widget...")
return self.make_callback('leave')
def key_press_event(self, widget, event):
keyname = event.key()
keyname2 = "%s" % (event.text())
keyname = self.transkey(keyname, keyname2)
self.logger.debug("key press event, key=%s" % (keyname))
return self.make_ui_callback('key-press', keyname)
def key_release_event(self, widget, event):
keyname = event.key()
keyname2 = "%s" % (event.text())
keyname = self.transkey(keyname, keyname2)
self.logger.debug("key release event, key=%s" % (keyname))
return self.make_ui_callback('key-release', keyname)
def button_press_event(self, widget, event):
buttons = event.buttons()
x, y = event.x(), event.y()
self.last_win_x, self.last_win_y = x, y
button = 0
if buttons & QtCore.Qt.LeftButton:
button |= 0x1
if buttons & QtCore.Qt.MidButton:
button |= 0x2
if buttons & QtCore.Qt.RightButton:
button |= 0x4
self.logger.debug("button down event at %dx%d, button=%x" % (x, y, button))
data_x, data_y = self.get_data_xy(x, y)
self.last_data_x, self.last_data_y = data_x, data_y
return self.make_ui_callback('button-press', button, data_x, data_y)
def button_release_event(self, widget, event):
# note: for mouseRelease this needs to be button(), not buttons()!
buttons = event.button()
x, y = event.x(), event.y()
self.last_win_x, self.last_win_y = x, y
button = 0
if buttons & QtCore.Qt.LeftButton:
button |= 0x1
if buttons & QtCore.Qt.MidButton:
button |= 0x2
if buttons & QtCore.Qt.RightButton:
button |= 0x4
data_x, data_y = self.get_data_xy(x, y)
self.last_data_x, self.last_data_y = data_x, data_y
return self.make_ui_callback('button-release', button, data_x, data_y)
def motion_notify_event(self, widget, event):
if self.is_redraw_pending():
# NOTE: this hack works around a bug in Qt5 (ver < 5.6.2)
# where mouse motion events are not compressed properly,
# causing many events to build up in the queue and slowing
# down the viewer due to each one forcing a redraw.
# This test tells us there is a deferred redraw waiting;
# discard any motion events until the redraw happens.
return True
buttons = event.buttons()
x, y = event.x(), event.y()
self.last_win_x, self.last_win_y = x, y
button = 0
if buttons & QtCore.Qt.LeftButton:
button |= 0x1
if buttons & QtCore.Qt.MidButton:
button |= 0x2
if buttons & QtCore.Qt.RightButton:
button |= 0x4
data_x, data_y = self.get_data_xy(x, y)
self.last_data_x, self.last_data_y = data_x, data_y
return self.make_ui_callback('motion', button, data_x, data_y)
def scroll_event(self, widget, event):
x, y = event.x(), event.y()
self.last_win_x, self.last_win_y = x, y
num_degrees, direction = get_scroll_info(event)
self.logger.debug("scroll deg={} direction={}".format(
num_degrees, direction))
data_x, data_y = self.get_data_xy(x, y)
self.last_data_x, self.last_data_y = data_x, data_y
return self.make_ui_callback('scroll', direction, num_degrees,
data_x, data_y)
def gesture_event(self, widget, event):
gesture = event.gestures()[0]
state = gesture.state()
if state == QtCore.Qt.GestureStarted:
gstate = 'start'
elif state == QtCore.Qt.GestureUpdated:
gstate = 'move'
elif state == QtCore.Qt.GestureFinished:
gstate = 'end'
elif state == QtCore.Qt.GestureCancelled:
gstate = 'end'
# dispatch on gesture type
gtype = event.gesture(QtCore.Qt.SwipeGesture)
if gtype:
self.gs_swiping(event, gesture, gstate)
return True
gtype = event.gesture(QtCore.Qt.PanGesture)
if gtype:
self.gs_panning(event, gesture, gstate)
return True
gtype = event.gesture(QtCore.Qt.PinchGesture)
if gtype:
self.gs_pinching(event, gesture, gstate)
return True
# gtype = event.gesture(QtCore.Qt.TapGesture)
# if gtype:
# self.gs_tapping(event, gesture, gstate)
# return True
# gtype = event.gesture(QtCore.Qt.TapAndHoldGesture)
# if gtype:
# self.gs_pressing(event, gesture, gstate)
# return True
return True
def gs_swiping(self, event, gesture, gstate):
if gstate == 'end':
_hd = gesture.horizontalDirection()
hdir = None
if _hd == QtGui.QSwipeGesture.Left:
hdir = 'left'
elif _hd == QtGui.QSwipeGesture.Right:
hdir = 'right'
_vd = gesture.verticalDirection()
vdir = None
if _vd == QtGui.QSwipeGesture.Up:
vdir = 'up'
elif _vd == QtGui.QSwipeGesture.Down:
vdir = 'down'
self.logger.debug("swipe gesture hdir=%s vdir=%s" % (
hdir, vdir))
return self.make_ui_callback('swipe', gstate, hdir, vdir)
def gs_pinching(self, event, gesture, gstate):
#print("PINCHING")
rot = gesture.rotationAngle()
scale = gesture.scaleFactor()
self.logger.debug("pinch gesture rot=%f scale=%f state=%s" % (
rot, scale, gstate))
return self.make_ui_callback('pinch', gstate, rot, scale)
def gs_panning(self, event, gesture, gstate):
#print("PANNING")
# x, y = event.x(), event.y()
# self.last_win_x, self.last_win_y = x, y
# data_x, data_y = self.get_data_xy(x, y)
# self.last_data_x, self.last_data_y = data_x, data_y
d = gesture.delta()
dx, dy = d.x(), d.y()
self.logger.debug("pan gesture dx=%f dy=%f state=%s" % (
dx, dy, gstate))
return self.make_ui_callback('pan', gstate, dx, dy)
def gs_tapping(self, event, gesture, gstate):
self.logger.debug("tapping gesture state=%s" % (
gstate))
def gs_pressing(self, event, gesture, gstate):
self.logger.debug("pressing gesture state=%s" % (
gstate))
def drop_event(self, widget, event):
dropdata = event.mimeData()
formats = list(map(str, list(dropdata.formats())))
self.logger.debug("available formats of dropped data are %s" % (
formats))
if "text/thumb" in formats:
if six.PY2:
thumbstr = str(dropdata.data("text/thumb"))
else:
thumbstr = str(dropdata.data("text/thumb"), encoding='ascii')
data = [ thumbstr ]
self.logger.debug("dropped thumb(s): %s" % (str(data)))
elif dropdata.hasUrls():
urls = list(dropdata.urls())
data = [ str(url.toString()) for url in urls ]
self.logger.debug("dropped filename(s): %s" % (str(data)))
elif "text/plain" in formats:
data = [ dropdata.text() ]
self.logger.debug("dropped filename(s): %s" % (str(data)))
else:
# No format that we understand--just pass it along
## data = dropdata.data(formats[0])
## self.logger.debug("dropped data of len %d" % (len(data)))
event.setAccepted(False)
return
event.setAccepted(True)
#event.acceptProposedAction()
self.make_ui_callback('drag-drop', data)
class ImageViewZoom(Mixins.UIMixin, ImageViewEvent):
# class variables for binding map and bindings can be set
bindmapClass = Bindings.BindingMapper
bindingsClass = Bindings.ImageViewBindings
@classmethod
def set_bindingsClass(cls, klass):
cls.bindingsClass = klass
@classmethod
def set_bindmapClass(cls, klass):
cls.bindmapClass = klass
def __init__(self, logger=None, settings=None, rgbmap=None,
render='widget',
bindmap=None, bindings=None):
ImageViewEvent.__init__(self, logger=logger, settings=settings,
rgbmap=rgbmap, render=render)
Mixins.UIMixin.__init__(self)
self.ui_setActive(True)
if bindmap is None:
bindmap = ImageViewZoom.bindmapClass(self.logger)
self.bindmap = bindmap
bindmap.register_for_events(self)
if bindings is None:
bindings = ImageViewZoom.bindingsClass(self.logger)
self.set_bindings(bindings)
def get_bindmap(self):
return self.bindmap
def get_bindings(self):
return self.bindings
def set_bindings(self, bindings):
self.bindings = bindings
bindings.set_bindings(self)
class CanvasView(ImageViewZoom):
def __init__(self, logger=None, settings=None, rgbmap=None,
render='widget',
bindmap=None, bindings=None):
ImageViewZoom.__init__(self, logger=logger, settings=settings,
rgbmap=rgbmap, render=render,
bindmap=bindmap, bindings=bindings)
# Needed for UIMixin to propagate events correctly
self.objects = [self.private_canvas]
def set_canvas(self, canvas, private_canvas=None):
super(CanvasView, self).set_canvas(canvas,
private_canvas=private_canvas)
self.objects[0] = self.private_canvas
class ScrolledView(QtGui.QAbstractScrollArea):
"""A class that can take a viewer as a parameter and add scroll bars
that respond to the pan/zoom levels.
"""
def __init__(self, viewer, parent=None):
self.viewer = viewer
super(ScrolledView, self).__init__(parent=parent)
# the window jiggles annoyingly as the scrollbar is alternately
# shown and hidden if we use the default "as needed" policy, so
# default to always showing them (user can change this after
# calling the constructor, if desired)
self.scroll_bars(horizontal='on', vertical='on')
self._adjusting = False
self._scrolling = False
self.pad = 20
self.upper_h = 100
self.upper_v = 100
# reparent the viewer widget
vp = self.viewport()
self.v_w = viewer.get_widget()
self.v_w.setParent(vp)
hsb = self.horizontalScrollBar()
hsb.setTracking(True)
hsb.setRange(0, 100)
hsb.setSingleStep(1)
vsb = self.verticalScrollBar()
vsb.setRange(0, 100)
vsb.setSingleStep(1)
vsb.setTracking(True)
self.viewer.add_callback('redraw', self._calc_scrollbars)
self.viewer.add_callback('limits-set',
lambda v, l: self._calc_scrollbars(v))
def get_widget(self):
return self
def resizeEvent(self, event):
"""Override from QAbstractScrollArea.
Resize the viewer widget when the viewport is resized."""
vp = self.viewport()
rect = vp.geometry()
x1, y1, x2, y2 = rect.getCoords()
width = x2 - x1
height = y2 - y1
self.v_w.resize(width, height)
def _calc_scrollbars(self, viewer):
"""Calculate and set the scrollbar handles from the pan and
zoom positions.
"""
if self._scrolling:
return
# flag that suppresses a cyclical callback
self._adjusting = True
try:
bd = self.viewer.get_bindings()
res = bd.calc_pan_pct(self.viewer, pad=self.pad)
if res is None:
return
hsb = self.horizontalScrollBar()
vsb = self.verticalScrollBar()
page_h, page_v = (int(round(res.thm_pct_x * 100)),
int(round(res.thm_pct_y * 100)))
hsb.setPageStep(page_h)
vsb.setPageStep(page_v)
upper_h, upper_v = max(1, 100 - page_h), max(1, 100 - page_v)
hsb.setRange(0, upper_h)
vsb.setRange(0, upper_v)
self.upper_h, self.upper_v = upper_h, upper_v
val_h, val_v = (int(round(res.pan_pct_x * self.upper_h)),
int(round((1.0 - res.pan_pct_y) * self.upper_v)))
hsb.setValue(val_h)
vsb.setValue(val_v)
finally:
self._adjusting = False
def scrollContentsBy(self, dx, dy):
"""Override from QAbstractScrollArea.
Called when the scroll bars are adjusted by the user.
"""
if self._adjusting:
return
self._scrolling = True
try:
hsb = self.horizontalScrollBar()
vsb = self.verticalScrollBar()
pct_x = hsb.value() / float(self.upper_h)
# invert Y pct because of orientation of scrollbar
pct_y = 1.0 - (vsb.value() / float(self.upper_v))
bd = self.viewer.get_bindings()
bd.pan_by_pct(self.viewer, pct_x, pct_y, pad=self.pad)
finally:
self._scrolling = False
def scroll_bars(self, horizontal='on', vertical='on'):
if horizontal == 'on':
self.setHorizontalScrollBarPolicy(QtCore.Qt.ScrollBarAlwaysOn)
elif horizontal == 'off':
self.setHorizontalScrollBarPolicy(QtCore.Qt.ScrollBarAlwaysOff)
elif horizontal == 'auto':
self.setHorizontalScrollBarPolicy(QtCore.Qt.ScrollBarAsNeeded)
else:
raise ValueError("Bad scroll bar option: '%s'; should be one of ('on', 'off' or 'auto')" % (horizontal))
if vertical == 'on':
self.setVerticalScrollBarPolicy(QtCore.Qt.ScrollBarAlwaysOn)
elif vertical == 'off':
self.setVerticalScrollBarPolicy(QtCore.Qt.ScrollBarAlwaysOff)
elif vertical == 'auto':
self.setVerticalScrollBarPolicy(QtCore.Qt.ScrollBarAsNeeded)
else:
raise ValueError("Bad scroll bar option: '%s'; should be one of ('on', 'off' or 'auto')" % (vertical))
#END
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