svgwindow.cpp

linux窗口程序设计一书的第五章代码-- 图形与图画,希望对大家有用

#include "svgwindow.h"

SvgWindow::SvgWindow(QWidget *parent)
{
    svgWidget = new SvgWidget;
    setWidget(svgWidget);
}

void SvgWindow::setFile(QString fileName)
{
    svgWidget->load(fileName);   
    QSvgRenderer *render = svgWidget->renderer();
    svgWidget->resize(render->defaultSize()); 
}

void SvgWindow::mousePressEvent(QMouseEvent *event)
{
    mousePressPos = event->pos();
    scrollBarValuesOnMousePress.rx() = horizontalScrollBar()->value();
    scrollBarValuesOnMousePress.ry() = verticalScrollBar()->value();
    event->accept();
}

void SvgWindow::mouseMoveEvent(QMouseEvent *event)
{
    if (mousePressPos.isNull()) 
    {
        event->ignore();
        return;
    }

    horizontalScrollBar()->setValue(scrollBarValuesOnMousePress.x() - event->pos().x() + mousePressPos.x());
    verticalScrollBar()->setValue(scrollBarValuesOnMousePress.y() - event->pos().y() + mousePressPos.y());
    horizontalScrollBar()->update();
    verticalScrollBar()->update();
    event->accept();
}

void SvgWindow::mouseReleaseEvent(QMouseEvent *event)
{
    mousePressPos = QPoint();
    event->accept();
}