Mercurial Repositories > eric / file comparison
comparison: src/eric7/Snapshot/SnapshotPreview.py
src/eric7/Snapshot/SnapshotPreview.py
- branch
- eric7
- changeset 9209
- b99e7fd55fd3
- parent 8881
- 54e42bc2437a
- child 9221
- bf71ee032bb4
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| 9208:3fc8dfeb6ebe | 9209:b99e7fd55fd3 |
|---|---|
| 1 # -*- coding: utf-8 -*- | |
| 2 | |
| 3 # Copyright (c) 2012 - 2022 Detlev Offenbach <detlev@die-offenbachs.de> | |
| 4 # | |
| 5 | |
| 6 """ | |
| 7 Module implementing the snapshot preview label. | |
| 8 """ | |
| 9 | |
| 10 from PyQt6.QtCore import pyqtSignal, QPoint, Qt | |
| 11 from PyQt6.QtWidgets import QLabel, QApplication | |
| 12 | |
| 13 | |
| 14 class SnapshotPreview(QLabel): | |
| 15 """ | |
| 16 Class implementing the snapshot preview label. | |
| 17 | |
| 18 @signal startDrag() emitted to indicate the start of a drag operation | |
| 19 """ | |
| 20 startDrag = pyqtSignal() | |
| 21 | |
| 22 def __init__(self, parent=None): | |
| 23 """ | |
| 24 Constructor | |
| 25 | |
| 26 @param parent reference to the parent widget (QWidget) | |
| 27 """ | |
| 28 super().__init__(parent) | |
| 29 | |
| 30 self.setAlignment(Qt.AlignmentFlag.AlignHCenter | | |
| 31 Qt.AlignmentFlag.AlignCenter) | |
| 32 self.setCursor(Qt.CursorShape.OpenHandCursor) | |
| 33 | |
| 34 self.__mouseClickPoint = QPoint(0, 0) | |
| 35 | |
| 36 def setPreview(self, preview): | |
| 37 """ | |
| 38 Public slot to set the preview picture. | |
| 39 | |
| 40 @param preview preview picture to be shown (QPixmap) | |
| 41 """ | |
| 42 pixmap = ( | |
| 43 preview.scaled( | |
| 44 self.width(), self.height(), | |
| 45 Qt.AspectRatioMode.KeepAspectRatio, | |
| 46 Qt.TransformationMode.SmoothTransformation) | |
| 47 if not preview.isNull() else | |
| 48 preview | |
| 49 ) | |
| 50 self.setPixmap(pixmap) | |
| 51 | |
| 52 def mousePressEvent(self, evt): | |
| 53 """ | |
| 54 Protected method to handle mouse button presses. | |
| 55 | |
| 56 @param evt mouse button press event (QMouseEvent) | |
| 57 """ | |
| 58 if evt.button() == Qt.MouseButton.LeftButton: | |
| 59 self.__mouseClickPoint = evt.position().toPoint() | |
| 60 | |
| 61 def mouseReleaseEvent(self, evt): | |
| 62 """ | |
| 63 Protected method to handle mouse button releases. | |
| 64 | |
| 65 @param evt mouse button release event (QMouseEvent) | |
| 66 """ | |
| 67 self.__mouseClickPoint = QPoint(0, 0) | |
| 68 | |
| 69 def mouseMoveEvent(self, evt): | |
| 70 """ | |
| 71 Protected method to handle mouse moves. | |
| 72 | |
| 73 @param evt mouse move event (QMouseEvent) | |
| 74 """ | |
| 75 if ( | |
| 76 self.__mouseClickPoint != QPoint(0, 0) and ( | |
| 77 evt.position().toPoint() - self.__mouseClickPoint | |
| 78 ).manhattanLength() > QApplication.startDragDistance() | |
| 79 ): | |
| 80 self.__mouseClickPoint = QPoint(0, 0) | |
| 81 self.startDrag.emit() |
