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93 lines
3.5 KiB
93 lines
3.5 KiB
from PyQt5.QtWidgets import QScrollArea, QLabel, QVBoxLayout, QWidget, QSizePolicy
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from PyQt5.QtCore import Qt, QPoint, QSize
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from PyQt5.QtGui import QPixmap, QImage, QResizeEvent, QPainter
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import fitz
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class PDFLabel(QLabel):
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def __init__(self, parent):
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super().__init__(parent)
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self.parent = parent
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self.setSizePolicy(QSizePolicy.MinimumExpanding, QSizePolicy.Preferred)
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def paintEvent(self, event):
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self.adjustSize()
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if self.pixmap() is not None:
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painter = QPainter(self)
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# painter.setRenderHint(QPainter.Antialiasing)
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parentLayoutMargins = self.parent.scrollAreaLayout.getContentsMargins()
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parentMargins = self.parent.getContentsMargins()
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if self.parent.verticalScrollBar().isVisible():
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scrollBarWidth = self.parent.verticalScrollBar().sizeHint().width()
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else:
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scrollBarWidth = 0
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totalMargin = parentLayoutMargins[0] + parentLayoutMargins[2] + \
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parentMargins[0]*2 + scrollBarWidth
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idealWidth = self.parent.width() - totalMargin
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print(idealWidth)
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pixSize = self.pixmap().size()
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print(pixSize)
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print((self.parent.scrollAreaContents.size()))
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pixSize.scale(idealWidth, 1000000, Qt.KeepAspectRatio)
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scaledPix = self.pixmap().scaled(pixSize, Qt.KeepAspectRatio, Qt.SmoothTransformation)
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painter.drawPixmap(QPoint(), scaledPix)
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self.setMaximumSize(pixSize)
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class PDFViewer(QScrollArea):
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def __init__(self, parent):
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super().__init__(parent)
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self.scrollAreaContents = QWidget()
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self.scrollAreaLayout = QVBoxLayout()
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self.setWidget(self.scrollAreaContents)
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self.setWidgetResizable(True)
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self.setHorizontalScrollBarPolicy(Qt.ScrollBarAlwaysOff)
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self.scrollAreaContents.setLayout(self.scrollAreaLayout)
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self.pixmapList = []
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self.lastVScrollPosition = None
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def update_pdf(self, pdf):
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self.render(pdf)
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self.clear()
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self.show()
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def render(self, pdf):
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"""
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Update the preview shown by rendering a new PDF and drawing it to the scroll area.
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"""
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self.pixmapList = []
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pdfView = fitz.Document(stream=pdf, filetype='pdf')
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for page in pdfView:
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# needs to be high enough for big monitors. 300 should do it...
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self.pixmapList.append(page.get_pixmap(dpi=300, alpha=False))
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def clear(self):
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self.lastVScrollPosition = self.verticalScrollBar().value()
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while self.scrollAreaLayout.count():
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item = self.scrollAreaLayout.takeAt(0)
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w = item.widget()
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if w:
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w.deleteLater()
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def show(self):
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for p in self.pixmapList:
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label = PDFLabel(parent=self)
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label.setAlignment(Qt.AlignHCenter)
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qtimg = QImage(p.samples, p.width, p.height, p.stride, QImage.Format_RGB888)
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label.setPixmap(QPixmap.fromImage(qtimg))
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self.scrollAreaLayout.addWidget(label)
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self.scrollAreaLayout.addStretch(1)
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# Somewhat of a hack. Should really replace pixmaps in place
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# rather than removing labels elsewhere in code.
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if self.lastVScrollPosition:
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self.verticalScrollBar().setValue(self.lastVScrollPosition)
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