main.cpp 范例文件

graphicsview/simpleanchorlayout/main.cpp
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#include <QtWidgets> class Widget : public QGraphicsWidget { public: Widget(const QColor &color, const QColor &textColor, const QString &caption, QGraphicsItem *parent = 0) : QGraphicsWidget(parent) , caption(caption) , color(color) , textColor(textColor) { } void paint(QPainter *painter, const QStyleOptionGraphicsItem *, QWidget * = 0) override { QFont font; font.setPixelSize(0.75 * qMin(boundingRect().width(), boundingRect().height())); painter->fillRect(boundingRect(), color); painter->save(); painter->setFont(font); painter->setPen(textColor); painter->drawText(boundingRect(), Qt::AlignCenter, caption); painter->restore(); } private: QString caption; QColor color; QColor textColor; }; int main(int argc, char *argv[]) { QApplication app(argc, argv); QGraphicsScene *scene = new QGraphicsScene(); Widget *a = new Widget(Qt::blue, Qt::white, "a"); a->setPreferredSize(100, 100); Widget *b = new Widget(Qt::green, Qt::black, "b"); b->setPreferredSize(100, 100); Widget *c = new Widget(Qt::red, Qt::black, "c"); c->setPreferredSize(100, 100); QGraphicsAnchorLayout *layout = new QGraphicsAnchorLayout(); /* layout->addAnchor(a, Qt::AnchorTop, layout, Qt::AnchorTop); layout->addAnchor(a, Qt::AnchorLeft, layout, Qt::AnchorLeft); */ layout->addCornerAnchors(a, Qt::TopLeftCorner, layout, Qt::TopLeftCorner); layout->addAnchor(b, Qt::AnchorLeft, a, Qt::AnchorRight); layout->addAnchor(b, Qt::AnchorTop, a, Qt::AnchorBottom); // Place a third widget below the second. layout->addAnchor(b, Qt::AnchorBottom, c, Qt::AnchorTop); /* layout->addAnchor(b, Qt::AnchorLeft, c, Qt::AnchorLeft); layout->addAnchor(b, Qt::AnchorRight, c, Qt::AnchorRight); */ layout->addAnchors(b, c, Qt::Horizontal); // Anchor the bottom-right corner of the third widget to the bottom-right // corner of the layout. layout->addCornerAnchors(c, Qt::BottomRightCorner, layout, Qt::BottomRightCorner); QGraphicsWidget *w = new QGraphicsWidget(0, Qt::Window | Qt::CustomizeWindowHint | Qt::WindowTitleHint); w->setPos(20, 20); w->setMinimumSize(100, 100); w->setPreferredSize(320, 240); w->setLayout(layout); w->setWindowTitle(QApplication::translate("simpleanchorlayout", "QGraphicsAnchorLayout in use")); scene->addItem(w); QGraphicsView *view = new QGraphicsView(); view->setScene(scene); view->setWindowTitle(QApplication::translate("simpleanchorlayout", "Simple Anchor Layout")); view->resize(360, 320); view->show(); return app.exec(); }