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Dante's questions

Martin Hope
Dante
Asked: 2024-11-27 23:56:23 +0800 CST
  • 6

我正在 QPdfView 中显示 pdf 文档，并且需要在几页上的某些区域上绘制覆盖层。

我已经设法绘制了覆盖层，但我需要一些帮助来调整滚动时其位置的调整方式。

代码如下：

from PySide6.QtCore import QRectF
from PySide6.QtGui import QPainter, QColor
from PySide6.QtPdfWidgets import QPdfView
from PySide6.QtCore import Qt
from PySide6.QtPdf import QPdfDocument

class CustomPdfView(QPdfView):  
    def __init__(self, parent=None):
        super().__init__(parent)
        
        # Placeholder areas
        self.highlights: dict[int, list[QRectF]] = {
            i : [QRectF(150.0, 150.0, 300.0, 300.0)] for i in range(200)
            }

    def paintEvent(self, event):
        super().paintEvent(event)

        if self.document().status() == QPdfDocument.Status.Ready:

            current_page_number = self.pageNavigator().currentPage()

            if current_page_number in self.highlights.keys():
                painter = QPainter(self.viewport())
                painter.setRenderHint(QPainter.RenderHint.Antialiasing)
                painter.setBrush(QColor(255, 255, 0, 100))
                painter.setPen(Qt.PenStyle.NoPen)

                total_pages = self.document().pageCount()
                current_page_size = self.document().pagePointSize(current_page_number)
                viewport_size = self.viewport().size()
                
                scroll_bar = self.verticalScrollBar()
                max_scroll = scroll_bar.maximum()
                
                scroll_per_page = max_scroll / total_pages
                scroll_calculated = scroll_per_page * current_page_number
                
                for rect in self.highlights[current_page_number]:

                    h_diff = scroll_bar.value() - scroll_calculated
                    
                    scaled_rect = QRectF(
                        (rect.x() / current_page_size.width()) * viewport_size.width(),
                        rect.y() - h_diff,
                        (rect.width() / current_page_size.width()) * viewport_size.width(),
                        rect.height()
                    )
                    painter.drawRect(scaled_rect)

                painter.end()

在最好的情况下，我想知道当前页面在视口中呈现了多少像素，因此 h_diff 变为 page_height - 可见像素

qt