diff -r 4e8b98454baa -r 800c432b34c8 eric7/Snapshot/SnapshotPreview.py
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/eric7/Snapshot/SnapshotPreview.py Sat May 15 18:45:04 2021 +0200
@@ -0,0 +1,81 @@
+# -*- coding: utf-8 -*-
+
+# Copyright (c) 2012 - 2021 Detlev Offenbach <detlev@die-offenbachs.de>
+#
+
+"""
+Module implementing the snapshot preview label.
+"""
+
+from PyQt5.QtCore import pyqtSignal, QPoint, Qt
+from PyQt5.QtWidgets import QLabel, QApplication
+
+
+class SnapshotPreview(QLabel):
+ """
+ Class implementing the snapshot preview label.
+
+ @signal startDrag() emitted to indicate the start of a drag operation
+ """
+ startDrag = pyqtSignal()
+
+ def __init__(self, parent=None):
+ """
+ Constructor
+
+ @param parent reference to the parent widget (QWidget)
+ """
+ super().__init__(parent)
+
+ self.setAlignment(Qt.AlignmentFlag.AlignHCenter |
+ Qt.AlignmentFlag.AlignCenter)
+ self.setCursor(Qt.CursorShape.OpenHandCursor)
+
+ self.__mouseClickPoint = QPoint(0, 0)
+
+ def setPreview(self, preview):
+ """
+ Public slot to set the preview picture.
+
+ @param preview preview picture to be shown (QPixmap)
+ """
+ pixmap = (
+ preview.scaled(
+ self.width(), self.height(),
+ Qt.AspectRatioMode.KeepAspectRatio,
+ Qt.TransformationMode.SmoothTransformation)
+ if not preview.isNull() else
+ preview
+ )
+ self.setPixmap(pixmap)
+
+ def mousePressEvent(self, evt):
+ """
+ Protected method to handle mouse button presses.
+
+ @param evt mouse button press event (QMouseEvent)
+ """
+ if evt.button() == Qt.MouseButton.LeftButton:
+ self.__mouseClickPoint = evt.pos()
+
+ def mouseReleaseEvent(self, evt):
+ """
+ Protected method to handle mouse button releases.
+
+ @param evt mouse button release event (QMouseEvent)
+ """
+ self.__mouseClickPoint = QPoint(0, 0)
+
+ def mouseMoveEvent(self, evt):
+ """
+ Protected method to handle mouse moves.
+
+ @param evt mouse move event (QMouseEvent)
+ """
+ if (
+ self.__mouseClickPoint != QPoint(0, 0) and
+ (evt.pos() - self.__mouseClickPoint).manhattanLength() >
+ QApplication.startDragDistance()
+ ):
+ self.__mouseClickPoint = QPoint(0, 0)
+ self.startDrag.emit()
