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3839127
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2010-10-01T12:28:31.350
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2010-10-01T12:28:31.350
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You want to change the default behavior of <code>QGraphicsScene</code>, so you have to create your own scene class, inheriting <code>QGraphicsScene</code>. In your class, you'll have to reimplement at least <code>mousePressEvent</code> and handle the item selection yourself. Here is how you could do it (the inherited scene class is called <code>GraphicsSelectionScene</code>) : <pre><code>void GraphicsSelectionScene::mousePressEvent(QGraphicsSceneMouseEvent* pMouseEvent) { QGraphicsItem* pItemUnderMouse = itemAt(pMouseEvent->scenePos().x(), pMouseEvent->scenePos().y()); if (!pItemUnderMouse) return; if (pItemUnderMouse->isEnabled() && pItemUnderMouse->flags() & QGraphicsItem::ItemIsSelectable) pItemUnderMouse->setSelected(!pItemUnderMouse->isSelected()); } </code></pre> Implementing this way, clicking on an item with select it if it is not already, or will unselect it otherwise. But be careful, implement <code>mousePressEvent</code> is certainly not enough : you'll have to handle the <code>mouseDoubleClickEvent</code>as well if you don't want the default behavior. Your scene will have to be displayed by a <code>QGraphicsView</code>. Here is an example of a view creating it's own scene (<code>MainFrm</code> class is inheriting <code>QGraphicsView</code>) : <pre><code>#include "mainfrm.h" #include "ui_mainfrm.h" #include "graphicsselectionscene.h" #include <QGraphicsItem> MainFrm::MainFrm(QWidget *parent) : QGraphicsView(parent), ui(new Ui::MainFrm) { ui->setupUi(this); // Create a scene with our own selection behavior QGraphicsScene* pScene = new GraphicsSelectionScene(this); this->setScene(pScene); // Create a few items for testing QGraphicsItem* pRect1 = pScene->addRect(10,10,50,50, QColor(Qt::red), QBrush(Qt::blue)); QGraphicsItem* pRect2 = pScene->addRect(100,-10,50,50); QGraphicsItem* pRect3 = pScene->addRect(-200,-30,50,50); // Make sure the items are selectable pRect1->setFlag(QGraphicsItem::ItemIsSelectable, true); pRect2->setFlag(QGraphicsItem::ItemIsSelectable, true); pRect3->setFlag(QGraphicsItem::ItemIsSelectable, true); } </code></pre>
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1. POHow to select multiple items without pressing Ctrl key within QGraphicsScene?
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1. COThank you very much! I copied your code and made some slight changes, that is works in my program.
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