Mercurial Repositories > eric / file comparison
comparison: Snapshot/SnapshotPreview.py
Snapshot/SnapshotPreview.py
- changeset 1772
- f325dfdc8f6b
- child 2302
- f29e9405c851
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| 1771:561e97413395 | 1772:f325dfdc8f6b |
|---|---|
| 1 # -*- coding: utf-8 -*- | |
| 2 | |
| 3 # Copyright (c) 2012 Detlev Offenbach <detlev@die-offenbachs.de> | |
| 4 # | |
| 5 | |
| 6 """ | |
| 7 Module implementing the snapshot preview label. | |
| 8 """ | |
| 9 | |
| 10 from PyQt4.QtCore import pyqtSignal, QPoint, Qt | |
| 11 from PyQt4.QtGui 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.AlignHCenter | Qt.AlignCenter) | |
| 31 self.setCursor(Qt.OpenHandCursor) | |
| 32 | |
| 33 self.__mouseClickPoint = QPoint(0, 0) | |
| 34 | |
| 35 def setPreview(self, preview): | |
| 36 """ | |
| 37 Public slot to set the preview picture. | |
| 38 | |
| 39 @param preview preview picture to be shown (QPixmap) | |
| 40 """ | |
| 41 if not preview.isNull(): | |
| 42 pixmap = preview.scaled( | |
| 43 self.width(), self.height(), Qt.KeepAspectRatio, Qt.SmoothTransformation) | |
| 44 else: | |
| 45 pixmap = preview | |
| 46 self.setPixmap(pixmap) | |
| 47 | |
| 48 def mousePressEvent(self, evt): | |
| 49 """ | |
| 50 Protected method to handle mouse button presses. | |
| 51 | |
| 52 @param evt mouse button press event (QMouseEvent) | |
| 53 """ | |
| 54 if evt.button() == Qt.LeftButton: | |
| 55 self.__mouseClickPoint = evt.pos() | |
| 56 | |
| 57 def mouseReleaseEvent(self, evt): | |
| 58 """ | |
| 59 Protected method to handle mouse button releases. | |
| 60 | |
| 61 @param evt mouse button release event (QMouseEvent) | |
| 62 """ | |
| 63 self.__mouseClickPoint = QPoint(0, 0) | |
| 64 | |
| 65 def mouseMoveEvent(self, evt): | |
| 66 """ | |
| 67 Protected method to handle mouse moves. | |
| 68 | |
| 69 @param evt mouse move event (QMouseEvent) | |
| 70 """ | |
| 71 if self.__mouseClickPoint != QPoint(0, 0) and \ | |
| 72 (evt.pos() - self.__mouseClickPoint).manhattanLength() > \ | |
| 73 QApplication.startDragDistance(): | |
| 74 self.__mouseClickPoint = QPoint(0, 0) | |
| 75 self.startDrag.emit() |
