{"id":183432,"date":"2013-06-22T22:06:02","date_gmt":"2013-06-22T18:06:02","guid":{"rendered":"http:\/\/savepearlharbor.com\/?p=183432"},"modified":"-0001-11-30T00:00:00","modified_gmt":"-0001-11-29T21:00:00","slug":"","status":"publish","type":"post","link":"https:\/\/savepearlharbor.com\/?p=183432","title":{"rendered":"Qt Graphics View FramWork \u2014 \u0442\u0435\u043c\u043d\u0430\u044f \u0441\u0442\u043e\u0440\u043e\u043d\u0430. \u0427\u0430\u0441\u0442\u044c 2<\/span>"},"content":{"rendered":"
\t\u0412 \u043f\u0440\u043e\u0434\u043e\u043b\u0436\u0435\u043d\u0438\u0438 \u043f\u0440\u0435\u0434\u044b\u0434\u0443\u0449\u0435\u0439<\/a> \u0441\u0442\u0430\u0442\u044c\u0438 \u043f\u0440\u043e\u0434\u043e\u043b\u0436\u0430\u0435\u043c \u0438\u0437\u0443\u0447\u0430\u0442\u044c \u0442\u0435\u043c\u043d\u044b\u0435 \u0441\u0442\u043e\u0440\u043e\u043d\u044b \u0434\u043e\u043a\u0443\u043c\u0435\u043d\u0442\u0430\u0446\u0438\u0438. \u0413\u0434\u0435-\u0442\u043e \u043e\u043d\u0438 \u043c\u043e\u0433\u0443\u0442 \u0431\u044b\u0442\u044c \u0445\u0430\u0440\u0430\u043a\u0442\u0435\u0440\u043d\u044b \u0434\u043b\u044f \u0432\u0441\u0435\u0433\u043e Qt, \u0430 \u0433\u0434\u0435-\u0442\u043e \u043f\u0440\u0438\u0441\u0443\u0449\u0438 \u0442\u043e\u043b\u044c\u043a\u043e Graphics View. \u041d\u043e \u0442\u0430\u043a \u0438\u043b\u0438 \u0438\u043d\u0430\u0447\u0435 \u0432\u0441\u0442\u0440\u0435\u0447\u0430 \u0441 \u043d\u0438\u043c\u0438 \u043d\u0435 \u0432\u0441\u0435\u0433\u0434\u0430 \u043f\u0440\u043e\u0445\u043e\u0434\u0438\u0442 \u0431\u0435\u0437\u0431\u043e\u043b\u0435\u0437\u043d\u0435\u043d\u043d\u043e.
<\/a> <\/p>\n

\u0414\u0435\u043b\u043e \u21163 <\/h4>\n

\u041c\u044b \u0445\u043e\u0442\u0438\u043c \u043d\u0430\u043f\u0438\u0441\u0430\u0442\u044c \u0441\u0432\u043e\u0439 item, \u0432 \u043a\u0430\u0447\u0435\u0441\u0442\u0432\u0435 \u043f\u0440\u0438\u043c\u0435\u0440\u0430 \u043f\u0438\u0448\u0435\u043c \u0441\u043b\u0435\u0434\u0443\u044e\u0449\u0438\u0439 \u043a\u043e\u0434 <\/p>\n

MainWindow.h<\/b><\/p>\n
\n
class MainWindow : public QWidget {     Q_OBJECT      public:     explicit MainWindow(QWidget *parent = 0);     ~MainWindow(); private:     QGraphicsScene *m_scene;     QGraphicsRectItem *m_rect;     QGraphicsItem *m_cross;     QGraphicsView * graphicsView; }; <\/code><\/pre>\n<\/div>\n<\/div>\n
  <\/p>\n
MainWindow.cpp<\/b><\/p>\n
\n
class CrossItem: public QGraphicsItem {  public:     QRectF boundingRect() const     {         return QRectF(0, 0, 30*scale(), 30*scale());     }     void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)     {         Q_UNUSED(option) Q_UNUSED(widget);         painter->setPen(QColor(Qt::red));         painter->drawLine(10, 0, 20, 0);             painter->drawLine(20*scale(), 0*scale(), 20*scale(), 10*scale());             painter->drawLine(20, 10, 30, 10);             painter->drawLine(30, 10, 30, 20);             painter->drawLine(30, 20, 20, 20);             painter->drawLine(20, 20, 20, 30);         painter->drawLine(20, 30, 10, 30);             painter->drawLine(10, 30, 10, 20);             painter->drawLine(10, 20,  0, 20);             painter->drawLine( 0, 20,  0, 10);             painter->drawLine( 0, 10, 10, 10);             painter->drawLine(10, 10, 10, 0);     } };   MainWindow::MainWindow(QWidget *parent) :     QWidget(parent) {     setLayout(new QGridLayout());     graphicsView = new QGraphicsView();         layout()->addWidget(graphicsView);         graphicsView->setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);         graphicsView->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);     m_scene = new QGraphicsScene();      m_cross = new CrossItem();         m_scene->addItem(m_cross); \/\/\t  m_cross->setScale(2);     m_rect = new QGraphicsRectItem(m_cross->boundingRect(), m_cross);         m_scene->addItem(m_rect);     m_scene->setSceneRect(m_rect->boundingRect());     graphicsView->setScene(m_scene); }  MainWindow::~MainWindow() { } <\/code><\/pre>\n<\/div>\n<\/div>\n
  \u041a\u043e\u043c\u043f\u043b\u0438\u0440\u0443\u0435\u043c, \u0437\u0430\u043f\u0443\u0441\u043a\u0430\u0435\u043c, \u0432\u0438\u0434\u0438\u043c \u0432\u043f\u0438\u0441\u0430\u043d\u043d\u044b\u0439 \u0432 \u043a\u0440\u0435\u0441\u0442 \u043a\u0432\u0430\u0434\u0440\u0430\u0442. \u0420\u0430\u0437\u043a\u043e\u043c\u043c\u0435\u043d\u0442\u0438\u0440\u0443\u0435\u043c \u0441\u0442\u0440\u043e\u0447\u043a\u0443, \u043a\u043e\u043c\u043f\u0438\u043b\u0438\u0440\u0443\u0435\u043c, \u0437\u0430\u043f\u0443\u0441\u043a\u0430\u0435\u043c \u0438 \u0432\u0438\u0434\u0438\u043c \u043d\u0435\u043f\u043e\u0442\u0440\u0435\u0431\u043d\u043e\u0435.<\/p>\n
  \u0414\u0435\u043b\u043e \u0432 \u0442\u043e\u043c, \u0447\u0442\u043e:  <\/p>\n
painter->drawLine(20*scale(), 0*scale(), 20*scale(), 10*scale()); <\/code><\/pre>\n
  \u0438  <\/p>\n
return QRectF(0, 0, 30*scale(), 30*scale());<\/code><\/pre>\n
   \u2014 \u0433\u043e\u0440\u0435 \u043e\u0442 \u0443\u043c\u0430. <\/p>\n
  \u0414\u0430\u0432\u0430\u0439\u0442\u0435 \u0440\u0430\u0441\u0441\u043c\u043e\u0442\u0440\u0438\u043c \u043a\u0430\u043a \u0445\u0440\u0430\u043d\u0438\u0442 QGraphicsItem \u0434\u0430\u043d\u043d\u044b\u0435 \u043e \u0442\u0440\u0430\u043d\u0441\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u044f\u0445:<\/p>\n
struct QGraphicsItemPrivate::TransformData {     QTransform transform;     qreal scale;     qreal rotation;     qreal xOrigin;     qreal yOrigin;     QList<QGraphicsTransform *> graphicsTransforms;     bool onlyTransform;      TransformData() :         scale(1.0), rotation(0.0),         xOrigin(0.0), yOrigin(0.0),         onlyTransform(true)     { }      QTransform computedFullTransform(QTransform *postmultiplyTransform = 0) const     {         if (onlyTransform) {             if (!postmultiplyTransform || postmultiplyTransform->isIdentity())                 return transform;             if (transform.isIdentity())                 return *postmultiplyTransform;             return transform * *postmultiplyTransform;         }          QTransform x(transform);         if (!graphicsTransforms.isEmpty()) {             QMatrix4x4 m;             for (int i = 0; i < graphicsTransforms.size(); ++i)                 graphicsTransforms.at(i)->applyTo(&m);             x *= m.toTransform();         }         x.translate(xOrigin, yOrigin);         x.rotate(rotation);         x.scale(scale, scale);         x.translate(-xOrigin, -yOrigin);         if (postmultiplyTransform)             x *= *postmultiplyTransform;         return x;     } }; <\/code><\/pre>\n
  \u0412\u0441\u0435 \u043e\u0447\u0435\u043d\u044c \u043f\u0440\u043e\u0441\u0442\u043e \u0438 \u0431\u0435\u0441\u0445\u0438\u0442\u0440\u043e\u0441\u0442\u043d\u043e, \u043a\u0430\u043a \u043c\u044b\u0447\u0430\u043d\u0438\u0435 \u043a\u043e\u0440\u043e\u0432\u044b \u043d\u0430 \u043b\u0443\u0433\u0443.\u0418 \u0441\u043e\u0431\u0441\u0442\u0432\u0435\u043d\u043d\u043e \u043f\u0435\u0440\u0435\u0434 \u0442\u0435\u043c \u043a\u0430\u043a \u0440\u0438\u0441\u043e\u0432\u0430\u0442\u044c \u0441\u0446\u0435\u043d\u0430 \u0434\u0435\u0440\u0433\u0430\u0435\u0442 \u043c\u0435\u0442\u043e\u0434 computedFullTransform<\/i> \u0438 \u0441\u043e\u0432\u0435\u0440\u0448\u0438\u0432 \u0435\u0449\u0435 \u043f\u0430\u0440\u0443 \u0448\u0430\u043c\u0430\u043d\u0441\u043a\u0438\u0445 \u0434\u0435\u0439\u0441\u0442\u0432\u0438\u0439 \u043f\u043e\u0434\u0441\u043e\u0432\u044b\u0432\u0430\u0435\u0442 \u044d\u0442\u043e QPainter-\u0443. 
  \u0422\u0443\u0442 \u043c\u043e\u0436\u0435\u043c \u043f\u043e\u0441\u0442\u0430\u0432\u0438\u0442\u044c \u0441\u0435\u0431\u0435 \u043d\u0430 \u0437\u0430\u043c\u0435\u0442\u043a\u0443, \u0447\u0442\u043e \u0435\u0441\u043b\u0438 \u043c\u044b \u0445\u043e\u0442\u0438\u043c \u0434\u0435\u043b\u0430\u0442\u044c \u0447\u0442\u043e-\u0442\u043e \u0445\u0438\u0442\u0440\u043e\u0435 \u0441 \u0444\u043e\u0440\u043c\u043e\u0439 \u043d\u0430\u0448\u0435\u0433\u043e item-a, \u0442\u043e \u043d\u0430\u043c \u0441\u043b\u0435\u0434\u0443\u0435\u0442 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c \u043c\u0435\u0442\u043e\u0434\u044b
  setScale<\/i>,setPos<\/i>, setRotation<\/i> \u0438 setTransforms<\/i> \u0438 \u0431\u043e\u043b\u0435\u0435 \u043d\u0430\u043c \u043d\u0438\u0447\u0435\u0433\u043e \u043d\u0435 \u043d\u0430\u0434\u043e.<\/p>\n
\u0414\u0435\u043b\u043e \u21164<\/h4>\n
  \u0425\u043e\u0442\u0438\u043c \u043e\u0442\u0441\u043b\u0435\u0436\u0438\u0432\u0430\u0442\u044c \u043f\u0435\u0440\u0435\u043c\u0435\u0449\u0435\u043d\u0438\u0435 \u043c\u044b\u0448\u0438 \u043f\u043e item-\u0443. \u0421\u0440\u0430\u0437\u0443 \u043f\u0440\u0435\u0434\u0443\u043f\u0440\u0435\u0436\u0434\u0430\u044e \u2014 \u0433\u0440\u0430\u0431\u043b\u0438 \u0437\u0434\u0435\u0441\u044c \u0440\u0430\u0437\u043b\u043e\u0436\u0435\u043d\u044b \u0431\u0443\u043a\u0432\u0430\u043b\u044c\u043d\u043e \u043d\u0430 \u043a\u0430\u0436\u0434\u043e\u043c \u0448\u0430\u0433\u0443. \u0418 \u0431\u0438\u043b\u0438 \u043e\u043d\u0438 \u043c\u0435\u043d\u044f \u043e\u0447\u0435\u043d\u044c \u0431\u043e\u043b\u044c\u043d\u043e \u0438 \u043e\u0447\u0435\u043d\u044c \u0443\u043f\u043e\u0440\u043d\u043e. \u041d\u043e \u043f\u043e\u043b\u043d\u044b\u0439 \u0441\u043f\u0438\u0441\u043e\u043a \u043c\u044b\u0442\u0430\u0440\u0441\u0442\u0432 \u043e\u043f\u0438\u0441\u044b\u0432\u0430\u0442\u044c \u043d\u0435 \u0431\u0443\u0434\u0443. \u041e\u0441\u0442\u0430\u043d\u043e\u0432\u043b\u044e\u0441\u044c \u0442\u043e\u043b\u044c\u043a\u043e \u043d\u0430 \u043a\u043b\u044e\u0447\u0435\u0432\u044b\u0445 \u043c\u043e\u043c\u0435\u043d\u0442\u0430\u0445  <\/p>\n
\u041f\u0435\u0440\u0435\u043f\u0438\u0448\u0435\u043c Mainwindow.cpp \u0441\u043b\u0435\u0434\u0443\u044e\u0449\u0438\u043c \u043e\u0431\u0440\u0430\u0437\u043e\u043c:<\/b><\/p>\n
\n
#include "MainWindow.h" #include <QGridLayout> #include <QGraphicsSceneHoverEvent> #include <QDebug> class MyRect: public QGraphicsRectItem { public:     MyRect(const QRectF &rect, QGraphicsItem *parent=0):QGraphicsRectItem(rect, parent){} protected:     void hoverMoveEvent(QGraphicsSceneHoverEvent *event)     {         qDebug()<<"rect"<<event->pos();         QGraphicsRectItem::hoverMoveEvent(event);     } };  class CrossItem: public QGraphicsItem {  public:     QRectF boundingRect() const     {         return QRectF(0, 0, 30, 30);     }     void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)     {         Q_UNUSED(option) Q_UNUSED(widget);         painter->setPen(QColor(Qt::red));         painter->drawLine(10, 0, 20, 0);             painter->drawLine(20, 0, 20, 10);             painter->drawLine(20, 10, 30, 10);             painter->drawLine(30, 10, 30, 20);             painter->drawLine(30, 20, 20, 20);             painter->drawLine(20, 20, 20, 30);         painter->drawLine(20, 30, 10, 30);             painter->drawLine(10, 30, 10, 20);             painter->drawLine(10, 20,  0, 20);             painter->drawLine( 0, 20,  0, 10);             painter->drawLine( 0, 10, 10, 10);             painter->drawLine(10, 10, 10, 0);     } protected:     void hoverMoveEvent(QGraphicsSceneHoverEvent *event)     {         qDebug()<<"cross"<<event->pos();         QGraphicsItem::hoverMoveEvent(event);     } };   MainWindow::MainWindow(QWidget *parent) :     QWidget(parent) {     setLayout(new QGridLayout());     graphicsView = new QGraphicsView();         layout()->addWidget(graphicsView);         graphicsView->setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);         graphicsView->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);     m_scene = new QGraphicsScene();      m_cross = new CrossItem();         m_rect = new MyRect(m_cross->boundingRect(), m_cross);     m_cross->setAcceptHoverEvents(true);         m_rect->setAcceptHoverEvents(true);     m_scene->addItem(m_cross);     m_scene->setSceneRect(m_rect->boundingRect());     graphicsView->setScene(m_scene); }  MainWindow::~MainWindow() { } <\/code><\/pre>\n<\/div>\n<\/div>\n
  \u041c\u044b \u0441\u043b\u0435\u0434\u0443\u0435\u043c \u043e\u0431\u0449\u0435\u0439 \u043b\u043e\u0433\u0438\u043a\u0435, \u0447\u0442\u043e \u0441\u043e\u0431\u044b\u0442\u0438\u044f \u0441\u0446\u0435\u043d\u044b \u2014 \u043f\u043e\u043b\u043d\u044b\u0435 \u0430\u043d\u0430\u043b\u043e\u0433\u0438 \u043e\u0431\u044b\u0447\u043d\u044b\u0445 \u0441\u043e\u0431\u044b\u0442\u0438\u0439. \u041e \u0447\u0435\u043c \u043d\u0430\u043c \u0440\u0430\u0434\u043e\u0441\u0442\u043d\u043e \u0441\u043e\u043e\u0431\u0449\u0430\u0435\u0442 \u0434\u043e\u043a\u0430 \u043f\u043e QGraphicsSceneHoverEvent<\/i>. <\/p>\n
  \u041a\u043e\u043c\u043f\u0438\u043b\u0438\u0440\u0443\u0435\u043c, \u0437\u0430\u043f\u0443\u0441\u043a\u0430\u0435\u043c \u0438 \u0432\u0438\u0434\u0438\u043c, \u0447\u0442\u043e \u043f\u0440\u0438 \u043f\u0435\u0440\u0435\u043c\u0435\u0449\u0435\u043d\u0438\u0438 \u043c\u044b\u0448\u0438 \u0441\u043e\u0431\u044b\u0442\u0438\u0435 \u0434\u043e\u0445\u043e\u0434\u0438\u0442 \u0442\u043e\u043b\u044c\u043a\u043e \u0434\u043e \u043f\u0440\u044f\u043c\u043e\u0443\u0433\u043e\u043b\u044c\u043d\u0438\u043a\u0430. \u041b\u0435\u0437\u0435\u043c \u0432 \u0434\u043e\u043a\u0443, \u0438 \u0433\u0434\u0435-\u0442\u043e \u043d\u0430 \u0437\u0430\u0434\u0432\u043e\u0440\u043a\u0430\u0445 \u043f\u0440\u0438 \u043e\u043f\u0438\u0441\u0430\u043d\u0438\u0438 \u0437\u0430\u0447\u0443\u0445\u043e\u043d\u043d\u043e\u0433\u043e \u043c\u0435\u0442\u043e\u0434\u0430 setAcceptHoverEvents<\/i> \u0447\u0438\u0442\u0430\u0435\u043c:<\/p>\n
Parent items receive hover enter events before their children, and leave events after their children. The parent does not receive a hover leave event if the cursor enters a child, though; the parent stays \u00abhovered\u00bb until the cursor leaves its area, including its children’s areas.<\/p>\n
  If a parent item handles child events, it will receive hover move, drag move, and drop events as the cursor passes through its children, but it does not receive hover enter and hover leave, nor drag enter and drag leave events on behalf of its children.<\/p>\n
  A QGraphicsWidget with window decorations will accept hover events regardless of the value of acceptHoverEvents().<\/p><\/blockquote>\n
  \u0418\u0442\u0430\u043a, \u043d\u0430\u043c \u043d\u0435\u043e\u0431\u0445\u043e\u0434\u0438\u043c\u043e \u043e\u0442\u0441\u043b\u0435\u0436\u0438\u0432\u0430\u0442\u044c \u0441\u043e\u0431\u044b\u0442\u0438\u044f \u043f\u043e\u0442\u043e\u043c\u043a\u0430. \u041e\u0441\u043e\u0437\u043d\u0430\u0432 \u044d\u0442\u043e \u0438 \u043f\u0440\u0438\u043d\u044f\u0432 \u0432\u043e \u0432\u043d\u0438\u043c\u0430\u043d\u0438\u0435 \u043f\u0440\u043e\u0447\u0435\u0435 \u0438\u0449\u0435\u043c \u043c\u0435\u0442\u043e\u0434, \u043a\u043e\u0442\u043e\u0440\u044b\u0439 \u043d\u0430\u043c \u043f\u043e\u043c\u043e\u0436\u0435\u0442.
   \u0418 \u0442\u0430\u043a\u043e\u0439 \u043d\u0430\u0445\u043e\u0434\u0438\u0442\u0441\u044f, \u044d\u0442\u043e setFiltersChildEvents<\/i>(\u043d\u0435 \u043f\u0443\u0442\u0430\u0442\u044c \u0441\u0445\u043e\u0436\u0438\u043c setHandlesChildEvents<\/i>, \u043d\u0430 \u0442\u043e\u043c \u043f\u0443\u0442\u0438 \u043d\u0430\u043c \u0441\u043b\u0430\u0432\u044b \u043d\u0435 \u043d\u0430\u0439\u0442\u0438). \u0414\u043e\u0431\u0430\u0432\u0438\u043c \u0435\u0433\u043e \u0432 \u043a\u043e\u043d\u0441\u0442\u0440\u0443\u043a\u0442\u043e\u0440:  <\/p>\n
m_cross->setFiltersChildEvents(true);<\/code><\/pre>\n
  \u0410 \u0442\u0430\u043a\u0436\u0435 \u0434\u043e\u0431\u0430\u0432\u0438\u043c \u0444\u0438\u043b\u044c\u0442\u0440 \u0432 \u043a\u043b\u0430\u0441\u0441 CrossItem:  <\/p>\n
    bool sceneEventFilter(QGraphicsItem *watched, QEvent *event)     {         if(event->type() == QEvent::GraphicsSceneHoverMove)             qDebug()<<"cross"<<event;         return false;     } <\/code><\/pre>\n
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\u0418\u0442\u043e\u0433<\/h4>\n
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