PowerDesigner/source/designerScene.cpp

#include "designerScene.h"
#include "util/selectorManager.h"

#include <QPainter>
#include <QGraphicsSceneMouseEvent>

DesignerScene::DesignerScene(QObject *parent)
    : QGraphicsScene(parent)
{
    m_bGridVisible = true;
    m_pView = nullptr;
}
DesignerScene::~DesignerScene()
{
}

void DesignerScene::drawBackground(QPainter* painter, const QRectF& rect)
{
    QGraphicsScene::drawBackground(painter, rect);
    painter->fillRect(sceneRect(), Qt::white);
    if(!m_bGridVisible)
        return;

    QRectF sceneRect = this->sceneRect();
    QPen pen;
    pen.setBrush(Qt::darkCyan);//藏青色
    pen.setStyle(Qt::DashLine);
    pen.setWidthF(0.2);
    painter->setPen(pen);
    int nGridSpace = 20; //暂时写死
    //竖线
    for(int nX = sceneRect.left(); nX < sceneRect.right(); nX += nGridSpace)
        painter->drawLine(nX,sceneRect.top(),nX,sceneRect.bottom());
    //横线
    for(int nY = sceneRect.top(); nY < sceneRect.bottom(); nY += nGridSpace)
        painter->drawLine(sceneRect.left(),nY,sceneRect.right(),nY);
    //补齐最后两条
    painter->drawLine(sceneRect.right(), sceneRect.top(), sceneRect.right(), sceneRect.bottom());
    painter->drawLine(sceneRect.left(), sceneRect.bottom(), sceneRect.right(), sceneRect.bottom());
}

void DesignerScene::mousePressEvent(QGraphicsSceneMouseEvent* mouseEvent)
{
    if(SelectorManager::getInstance())
    {
        SelectorManager::getInstance()->getWorkingSelector()->mousePressEvent(mouseEvent, this);
        update();
    }
    else
        QGraphicsScene::mousePressEvent(mouseEvent);
}

void DesignerScene::mouseMoveEvent(QGraphicsSceneMouseEvent* mouseEvent)
{
    if(SelectorManager::getInstance())
    {
        SelectorManager::getInstance()->getWorkingSelector()->mouseMoveEvent(mouseEvent, this);
        update();
    }
    else
        QGraphicsScene::mouseMoveEvent(mouseEvent);
}

void DesignerScene::mouseReleaseEvent(QGraphicsSceneMouseEvent* mouseEvent)
{
    if(SelectorManager::getInstance())
    {
        SelectorManager::getInstance()->getWorkingSelector()->mouseReleaseEvent(mouseEvent, this);
        update();
    }
    else
        QGraphicsScene::mouseReleaseEvent(mouseEvent);
}

void DesignerScene::mouseDoubleClickEvent(QGraphicsSceneMouseEvent* mouseEvent)
{
    if(SelectorManager::getInstance())
    {
        SelectorManager::getInstance()->getWorkingSelector()->mouseDoubleClickEvent(mouseEvent, this);
        update();
    }
    else
        QGraphicsScene::mouseReleaseEvent(mouseEvent);
}

void DesignerScene::keyPressEvent(QKeyEvent* event)
{
    QGraphicsScene::keyPressEvent(event);
}

void DesignerScene::keyReleaseEvent(QKeyEvent* event)
{
    QGraphicsScene::keyReleaseEvent(event);
}

void DesignerScene::setGridVisible(bool bVisible)
{
    m_bGridVisible = bVisible;
    update();
}

void DesignerScene::callParentEvent(QGraphicsSceneMouseEvent* mouseEvent)
{
    //调用QGraphicsScene的函数，会直接触发一些操作，比如取消item的selected状态，从而触发item的一些函数（itemChange）,然后在item的相应函数中书写执行一些操作
    switch (mouseEvent->type())
    {
    case QEvent::GraphicsSceneMousePress:
        QGraphicsScene::mousePressEvent(mouseEvent);
        break;

    case QEvent::GraphicsSceneMouseMove:
        QGraphicsScene::mouseMoveEvent(mouseEvent);
        break;

    case QEvent::GraphicsSceneMouseRelease:
        QGraphicsScene::mouseReleaseEvent(mouseEvent);
        break;

    default:
        break;
    }
}