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# This file is part of the qpopplerview package.
#
# Copyright (c) 2010 - 2014 by Wilbert Berendsen
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
# See http://www.gnu.org/licenses/ for more information.
"""
The Magnifier magnifies a part of the displayed Poppler document.
"""
import weakref
from PyQt5.QtCore import QPoint, QRect
from PyQt5.QtGui import QColor, QPainter, QPen, QRegion
from PyQt5.QtWidgets import QWidget
from . import cache
class Magnifier(QWidget):
"""A Magnifier is added to a Surface with surface.setMagnifier().
It is shown when a mouse button is pressed together with a modifier
(by default Ctrl, see surface.py).
Its size can be changed with resize() and the scale (defaulting to 4.0)
with setScale().
"""
# Maximum extra zoom above the View.MAX_ZOOM
MAX_EXTRA_ZOOM = 1.25
def __init__(self, parent = None):
super(Magnifier, self).__init__(parent)
self._page= None
self.setScale(4.0)
self.resize(250, 250)
self.hide()
def moveCenter(self, pos):
"""Called by the surface, centers the widget on the given QPoint."""
r = self.geometry()
r.moveCenter(pos)
r.translate(self.parent().surface().pos())
self.setGeometry(r)
def setScale(self, scale):
"""Sets the scale, relative to the 100% size of a Page.
Uses the dpi() from the layout (pageLayout()) of the surface.
"""
self._scale = scale
self.update()
def scale(self):
"""Returns the scale, defaulting to 4.0 (=400%)."""
return self._scale
def resizeEvent(self, ev):
"""Called on resize, sets our circular mask."""
self.setMask(QRegion(self.rect(), QRegion.Ellipse))
def paintEvent(self, ev):
"""Called when paint is needed, finds out which page to magnify."""
layout = self.parent().surface().pageLayout()
pos = self.geometry().center() - self.parent().surface().pos()
page = layout.pageAt(pos)
if not page:
return
pagePos = pos - page.pos()
max_zoom = self.parent().surface().view().MAX_ZOOM * self.MAX_EXTRA_ZOOM
newPage = Page(page, min(max_zoom, self._scale * page.scale()))
if not newPage.same_page(self._page):
if self._page:
self._page.magnifier = None
self._page = newPage
self._page.magnifier = self
relx = pagePos.x() / float(page.width())
rely = pagePos.y() / float(page.height())
image = cache.image(self._page)
img_rect = QRect(self.rect())
img_rect.setSize( img_rect.size()*self._page._retinaFactor );
if not image:
cache.generate(self._page)
image = cache.image(self._page, False)
if image:
img_rect.setWidth(img_rect.width() * image.width() / self._page.physWidth())
img_rect.setHeight(img_rect.height() * image.height() / self._page.physHeight())
if image:
img_rect.moveCenter(QPoint(relx * image.width(), rely * image.height()))
p = QPainter(self)
p.drawImage(self.rect(), image, img_rect)
p.setRenderHint(QPainter.Antialiasing, True)
p.setPen(QPen(QColor(192, 192, 192, 128), 6))
p.drawEllipse(self.rect().adjusted(2, 2, -2, -2))
class Page(object):
"""A data structure describing a Page like page.Page.
Has the methods the cache needs to create, store and find images
for our magnifier.
"""
def __init__(self, page, scale):
"""Creates Page, based on the page.Page object and the scale."""
dpix, dpiy = page.layout().dpi()
size = page.pageSize()
self._document = weakref.ref(page.document())
self._pageNumber = page.pageNumber()
self._width = size.width() * dpix * scale / 72.0
self._height = size.height() * dpiy * scale / 72.0
self._retinaFactor = page._retinaFactor
self._rotation = page.rotation()
self.magnifier = None
def same_page(self, other):
return (
other is not None and
self._document() == other._document() and
self._pageNumber == other._pageNumber and
self._width == other._width and
self._height == other._height and
self._rotation == other._rotation
)
def document(self):
return self._document()
def pageNumber(self):
return self._pageNumber
def width(self):
return self._width
def height(self):
return self._height
def physWidth(self):
return self._width*self._retinaFactor
def physHeight(self):
return self._height*self._retinaFactor
def rotation(self):
return self._rotation
def update(self):
if self.magnifier:
self.magnifier.update()
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