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// react on toggling the visibility checkbox within the treeWidget
void PolyCreater::stateChanged(int signal)
{
	// detect the selected checkbox
	QCheckBox *cb = qobject_cast<QCheckBox *>( sender() );

	// index of the selected layer (either as directly chosen or as parent node
	// of the chosen polygon or segment)
	int selectedLayerIndex = -1;
	// index of the selected segment (either as directly chosen or as parent node
	// of the chosen polygon)
	int selectedSegmentIndex = -1;
	// index of the selected polygon
	int selectedPolygonIndex = -1;

	// item for the selected item of the treewidget
	QTreeWidgetItem *selectedItem;

	// if the checkbox could be detected
	if (cb)
	{
		// choose the selected item
		selectedItem = ui.treeWidget->itemAt(cb->pos());

		// check if the selected item is on top level (which means it is a layer)
		selectedLayerIndex = ui.treeWidget->indexOfTopLevelItem(selectedItem);

		// if it is a layer
		if (-1 != selectedLayerIndex)
		{
			// change the layers visibility
			polyHelper->layers[selectedLayerIndex].isVisible = (signal == Qt::Checked);

			// and repaint the polygons
			paintAllPolygons();
		}
		// otherwise
		else
		{
			// if it is not a layer
			if (-1 == selectedLayerIndex)
			{
				// check if the parent node of the selected item is a layer
				selectedLayerIndex = ui.treeWidget->indexOfTopLevelItem(selectedItem->parent());

				// if the parent node is a layer
				if (-1 != selectedLayerIndex)
				{
					// then search within for the selected child (which means it is a segment)
					selectedSegmentIndex = ui.treeWidget->topLevelItem(selectedLayerIndex)->indexOfChild(selectedItem);

					// if the selected item is a segment
					if (-1 != selectedSegmentIndex)
					{
						// change the segments visibility
						polyHelper->layers[selectedLayerIndex].segments[selectedSegmentIndex].isVisible = (signal == Qt::Checked);

						// and repaint the polygons
						paintAllPolygons();
					}
				}
				// otherwise
				else
				{
					// if the parent node is not a layer (which means the parent node has to be a segment in a 3 subsequent node structure)
					if (-1 == selectedLayerIndex)
					{
						// detect the layer index through the parent of the parent (which means the parent of the selected item is a segment
						// and the parent of the segment is the layer)
						selectedLayerIndex = ui.treeWidget->indexOfTopLevelItem(selectedItem->parent()->parent());

						// detect the segment index within the above selected layer through the parent of selected item (which means the
						// parent is a segment)
						selectedSegmentIndex = ui.treeWidget->topLevelItem(selectedLayerIndex)->indexOfChild(selectedItem->parent());

						// search within the selected layer and segment for the selected polygon
						selectedPolygonIndex = ui.treeWidget->topLevelItem(selectedLayerIndex)->child(selectedSegmentIndex)->indexOfChild(selectedItem);

						// if the polygon could be found (which is the last chance, because the who emitted the stateChanged event was not found
						// within the upper layer and segment childs)
						if (-1 != selectedPolygonIndex)
						{
							// change the polygons visibility
							polyHelper->layers[selectedLayerIndex].segments[selectedSegmentIndex].polygons[selectedPolygonIndex].isVisible = (signal == Qt::Checked);

							// and repaint the polygons
							paintAllPolygons();
						}
					}
				}
			}
		}
	}
}

Code: Alles auswählen

void myQGraphicsView::mouseReleaseEvent(QMouseEvent *event)
{
	QRect maxRect = QRect(-20, -20, 2000, 1500);

	QRect sceneRect = (scene()->sceneRect()).toRect();

	if (maxRect.contains(sceneRect, TRUE))
	{
		fitInView(scene()->sceneRect(), Qt::KeepAspectRatio);
	}
	else
	{
		scene()->setSceneRect(maxRect);
		fitInView(scene()->sceneRect(), Qt::KeepAspectRatio);
	}

	QGraphicsView::mouseReleaseEvent(event);
}