Mercurial Repositories > eric / file comparison
comparison: src/eric7/PdfViewer/PdfView.py
src/eric7/PdfViewer/PdfView.py
- branch
- pdf_viewer
- changeset 9704
- 6e1650b9b3b5
- child 9707
- 717f95e35ca8
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| 9702:7c973954919d | 9704:6e1650b9b3b5 |
|---|---|
| 1 # -*- coding: utf-8 -*- | |
| 2 | |
| 3 # Copyright (c) 2023 Detlev Offenbach <detlev@die-offenbachs.de> | |
| 4 # | |
| 5 | |
| 6 """ | |
| 7 Module implementing a specialized PDF view class. | |
| 8 """ | |
| 9 | |
| 10 from PyQt6.QtCore import QSize, Qt, pyqtSlot, QEvent | |
| 11 from PyQt6.QtGui import QGuiApplication | |
| 12 from PyQt6.QtPdfWidgets import QPdfView | |
| 13 | |
| 14 from .PdfZoomSelector import PdfZoomSelector | |
| 15 | |
| 16 | |
| 17 class PdfView(QPdfView): | |
| 18 """ | |
| 19 Class implementing a specialized PDF view. | |
| 20 """ | |
| 21 | |
| 22 def __init__(self, parent): | |
| 23 """ | |
| 24 Constructor | |
| 25 | |
| 26 @param parent reference to the parent widget | |
| 27 @type QWidget | |
| 28 """ | |
| 29 super().__init__(parent) | |
| 30 | |
| 31 self.__screenResolution = ( | |
| 32 QGuiApplication.primaryScreen().logicalDotsPerInch() / 72.0 | |
| 33 ) | |
| 34 | |
| 35 self.grabGesture(Qt.GestureType.PinchGesture) | |
| 36 | |
| 37 def __zoomInOut(self, zoomIn): | |
| 38 """ | |
| 39 Private method to zoom into or out of the view. | |
| 40 | |
| 41 @param zoomIn flag indicating to zoom into the view | |
| 42 @type bool | |
| 43 """ | |
| 44 zoomFactor = self.__zoomFactorForMode(self.zoomMode()) | |
| 45 | |
| 46 factors = list(PdfZoomSelector.ZoomValues) | |
| 47 factors.append(self.__zoomFactorForMode(QPdfView.ZoomMode.FitInView)) | |
| 48 factors.append(self.__zoomFactorForMode(QPdfView.ZoomMode.FitToWidth)) | |
| 49 if zoomIn: | |
| 50 factors.sort() | |
| 51 if zoomFactor >= factors[-1]: | |
| 52 return | |
| 53 newIndex = next(x for x, val in enumerate(factors) if val > zoomFactor) | |
| 54 else: | |
| 55 factors.sort(reverse=True) | |
| 56 if zoomFactor <= factors[-1]: | |
| 57 return | |
| 58 newIndex = next(x for x, val in enumerate(factors) if val < zoomFactor) | |
| 59 newFactor = factors[newIndex] | |
| 60 if newFactor == self.__zoomFactorForMode(QPdfView.ZoomMode.FitInView): | |
| 61 self.setZoomMode(QPdfView.ZoomMode.FitInView) | |
| 62 self.zoomModeChanged.emit(QPdfView.ZoomMode.FitInView) | |
| 63 elif newFactor == self.__zoomFactorForMode(QPdfView.ZoomMode.FitToWidth): | |
| 64 self.setZoomMode(QPdfView.ZoomMode.FitToWidth) | |
| 65 self.zoomModeChanged.emit(QPdfView.ZoomMode.FitToWidth) | |
| 66 else: | |
| 67 self.setZoomFactor(newFactor) | |
| 68 self.zoomFactorChanged.emit(newFactor) | |
| 69 self.setZoomMode(QPdfView.ZoomMode.Custom) | |
| 70 self.zoomModeChanged.emit(QPdfView.ZoomMode.Custom) | |
| 71 | |
| 72 def __zoomFactorForMode(self, zoomMode): | |
| 73 """ | |
| 74 Private method to calculate the zoom factor iaw. the current zoom mode. | |
| 75 | |
| 76 @param zoomMode zoom mode to get the zoom factor for | |
| 77 @type QPdfView.ZoomMode | |
| 78 @return zoom factor | |
| 79 @rtype float | |
| 80 """ | |
| 81 if zoomMode == QPdfView.ZoomMode.Custom: | |
| 82 return self.zoomFactor() | |
| 83 else: | |
| 84 viewport = self.viewport() | |
| 85 curPage = self.pageNavigator().currentPage() | |
| 86 margins = self.documentMargins() | |
| 87 if zoomMode == QPdfView.ZoomMode.FitToWidth: | |
| 88 pageSize = ( | |
| 89 self.document().pagePointSize(curPage) * self.__screenResolution | |
| 90 ).toSize() | |
| 91 factor = ( | |
| 92 viewport.width() - margins.left() - margins.right() | |
| 93 ) / pageSize.width() | |
| 94 pageSize *= factor | |
| 95 else: | |
| 96 # QPdfView.ZoomMode.FitInView | |
| 97 viewportSize = viewport.size() + QSize( | |
| 98 -margins.left() - margins.right(), -self.pageSpacing() | |
| 99 ) | |
| 100 pageSize = ( | |
| 101 self.document().pagePointSize(curPage) * self.__screenResolution | |
| 102 ).toSize() | |
| 103 pageSize = pageSize.scaled( | |
| 104 viewportSize, Qt.AspectRatioMode.KeepAspectRatio | |
| 105 ) | |
| 106 zoomFactor = pageSize.width() / ( | |
| 107 self.document().pagePointSize(curPage) * self.__screenResolution | |
| 108 ).width() | |
| 109 return zoomFactor | |
| 110 | |
| 111 @pyqtSlot() | |
| 112 def zoomIn(self): | |
| 113 """ | |
| 114 Public slot to zoom into the view. | |
| 115 """ | |
| 116 self.__zoomInOut(True) | |
| 117 | |
| 118 @pyqtSlot() | |
| 119 def zoomOut(self): | |
| 120 """ | |
| 121 Public slot to zoom out of the view. | |
| 122 """ | |
| 123 self.__zoomInOut(False) | |
| 124 | |
| 125 @pyqtSlot() | |
| 126 def zoomReset(self): | |
| 127 """ | |
| 128 Public slot to reset the zoom factor of the view. | |
| 129 """ | |
| 130 if self.zoomMode() != QPdfView.ZoomMode.Custom or self.zoomFactor() != 1.0: | |
| 131 self.setZoomFactor(1.0) | |
| 132 self.zoomFactorChanged.emit(1.0) | |
| 133 self.setZoomMode(QPdfView.ZoomMode.Custom) | |
| 134 self.zoomModeChanged.emit(QPdfView.ZoomMode.Custom) | |
| 135 | |
| 136 def wheelEvent(self, evt): | |
| 137 """ | |
| 138 Protected method to handle wheel events. | |
| 139 | |
| 140 @param evt reference to the wheel event | |
| 141 @type QWheelEvent | |
| 142 """ | |
| 143 delta = evt.angleDelta().y() | |
| 144 if evt.modifiers() & Qt.KeyboardModifier.ControlModifier: | |
| 145 if delta < 0: | |
| 146 self.zoomOut() | |
| 147 elif delta > 0: | |
| 148 self.zoomIn() | |
| 149 evt.accept() | |
| 150 return | |
| 151 | |
| 152 elif evt.modifiers() & Qt.KeyboardModifier.ShiftModifier: | |
| 153 if delta < 0: | |
| 154 self.pageNavigator().back() | |
| 155 elif delta > 0: | |
| 156 self.pageNavigator().forward() | |
| 157 evt.accept() | |
| 158 return | |
| 159 | |
| 160 super().wheelEvent(evt) | |
| 161 | |
| 162 def event(self, evt): | |
| 163 """ | |
| 164 Public method handling events. | |
| 165 | |
| 166 @param evt reference to the event | |
| 167 @type QEvent | |
| 168 @return flag indicating, if the event was handled | |
| 169 @rtype bool | |
| 170 """ | |
| 171 if evt.type() == QEvent.Type.Gesture: | |
| 172 self.gestureEvent(evt) | |
| 173 return True | |
| 174 | |
| 175 return super().event(evt) | |
| 176 | |
| 177 def gestureEvent(self, evt): | |
| 178 """ | |
| 179 Protected method handling gesture events. | |
| 180 | |
| 181 @param evt reference to the gesture event | |
| 182 @type QGestureEvent | |
| 183 """ | |
| 184 pinch = evt.gesture(Qt.GestureType.PinchGesture) | |
| 185 if pinch: | |
| 186 if pinch.state() == Qt.GestureState.GestureStarted: | |
| 187 pinch.setTotalScaleFactor(self.__zoomFactorForMode(self.zoomMode())) | |
| 188 elif pinch.state() == Qt.GestureState.GestureUpdated: | |
| 189 if self.zoomMode() != QPdfView.ZoomMode.Custom: | |
| 190 self.setZoomMode(QPdfView.ZoomMode.Custom) | |
| 191 self.zoomModeChanged.emit(QPdfView.ZoomMode.Custom) | |
| 192 zoomFactor = pinch.totalScaleFactor() | |
| 193 self.setZoomFactor(zoomFactor) | |
| 194 self.zoomFactorChanged.emit(zoomFactor) | |
| 195 evt.accept() |
