Python QApplication.startDragDistance方法代码示例

# 需要导入模块: from python_qt_binding.QtGui import QApplication [as 别名]
# 或者: from python_qt_binding.QtGui.QApplication import startDragDistance [as 别名]
    def _event(self, e):
        if e.type() == QEvent.MouseButtonPress and e.button() == Qt.LeftButton:
            qDebug('%spress, rel=%s, global=%s, diff=%s' % ((' - pseudo ' if self._releasing_and_repressing_while_dragging else ''), e.pos(), e.globalPos(), e.globalPos() - self.pos()))
        if e.type() == QEvent.MouseButtonRelease and e.button() == Qt.LeftButton:
            qDebug('%srelease, rel=%s, global=%s, diff=%s' % ((' - pseudo ' if self._releasing_and_repressing_while_dragging else ''), e.pos(), e.globalPos(), e.globalPos() - self.pos()))

        # store local position when pressing button before starting the custom drag'n'drop
        # only allow when layout is not frozen
        if self._dragging_parent is None and e.type() == QEvent.MouseButtonPress and e.button() == Qt.LeftButton and bool(self.features() & QDockWidget.DockWidgetMovable):
            self._dragging_local_pos = e.pos()

        if self._dragging_parent is None and self._dragging_local_pos is not None and e.type() == QEvent.Move and QApplication.mouseButtons() & Qt.LeftButton:
            if self._widget_at(e.pos()) is not None:
                qDebug('DockWidget._event() start drag, dockwidget=%s, parent=%s, floating=%s, pos=%s' % (str(self), str(self.parent()), str(self.isFloating()), str(self._dragging_local_pos)))
                self._dragging_parent = self.parent()
                # ignore further mouse events so that the widget behind this dock widget can be determined
                self.setAttribute(Qt.WA_TransparentForMouseEvents)

                # collect all main windows (except self.main_window) to re-implement QApplication.widgetAt() in self._widget_at()
                self._main_windows = [self._container_manager.get_root_main_window()]
                for container in self._container_manager.get_containers():
                    if container == self:
                        continue
                    self._main_windows.append(container.main_window)

        # unset local position when releasing button even when custom drag'n'drop has not been started
        if self._dragging_local_pos is not None and e.type() == QEvent.MouseButtonRelease and e.button() == Qt.LeftButton and not self._releasing_and_repressing_while_dragging:
            self._dragging_local_pos = None

        if self._dragging_parent is not None and e.type() == QEvent.MouseButtonRelease and e.button() == Qt.LeftButton and not self._releasing_and_repressing_while_dragging:
            qDebug('DockWidget._event() stop drag, dockwidget=%s, parent=%s\n' % (self, self.parent()))
            self._dragging_parent = None
            self.setAttribute(Qt.WA_TransparentForMouseEvents, False)
            self._main_windows = []

        if self._dragging_parent is not None and e.type() == QEvent.MouseMove and e.buttons() & Qt.LeftButton and not self._releasing_and_repressing_while_dragging:
            widget = self._widget_at(e.globalPos())
            new_parent = self._get_new_parent(widget)
            #print 'new_parent', new_parent, (new_parent.objectName() if new_parent else '')
            if new_parent is not None and new_parent != self.parent():
                self._releasing_and_repressing_while_dragging = True

                # schedule stop of pseudo drag'n'drop and let it complete
                mouse_release_event = QMouseEvent(QEvent.MouseButtonRelease, self._dragging_local_pos, e.globalPos(), Qt.LeftButton, Qt.NoButton, e.modifiers())
                QApplication.instance().postEvent(self, mouse_release_event)
                QApplication.sendPostedEvents()

                # schedule reparent to hovered main window and let it complete
                reparent_event = ReparentEvent(self, new_parent)
                QApplication.instance().postEvent(self._container_manager, reparent_event)
                QApplication.sendPostedEvents()

                # reenable mouse events to be able to receive upcoming pseudo mouse events
                self.setAttribute(Qt.WA_TransparentForMouseEvents, False)

                # schedule restart of pseudo drag'n'drop and let it complete
                mouse_repress_event = QMouseEvent(QEvent.MouseButtonPress, self._dragging_local_pos, e.globalPos(), Qt.LeftButton, Qt.LeftButton, e.modifiers())
                QApplication.instance().postEvent(self, mouse_repress_event)
                QApplication.sendPostedEvents()

                # schedule move to trigger dock widget drag'n'drop required for snapping and showing rubber band and let it complete
                # move forth...
                mouse_move_event = QMouseEvent(QEvent.MouseMove, self._dragging_local_pos, e.globalPos() + QPoint(QApplication.startDragDistance(), 1), Qt.NoButton, Qt.LeftButton, e.modifiers())
                QApplication.instance().postEvent(self, mouse_move_event)
                QApplication.sendPostedEvents()
                # ...and back
                mouse_move_event = QMouseEvent(QEvent.MouseMove, self._dragging_local_pos, e.globalPos(), Qt.NoButton, Qt.LeftButton, e.modifiers())
                QApplication.instance().postEvent(self, mouse_move_event)
                QApplication.sendPostedEvents()

                # restore attributes after repressing the button
                self.setAttribute(Qt.WA_TransparentForMouseEvents)

                self._releasing_and_repressing_while_dragging = False

        return super(DockWidget, self).event(e)