Handling QScrollArea
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Hi,
I want to paint a lot of shape via QPainter so I need Scroll to show all of them.
I make a QScrollArea and must to add a widget to it but I can't handle QPainter where to paint shapes.this function draw a line that is too long.
@
void MainWindow::paintEvent(QPaintEvent *)
{
QPainter painter(this);
painter.setPen(Qt::blue);
painter.drawLine(30,30,30,300);
painter.drawLine(30,300,3000000,300);
}
@this is the Constructor of mianwindow that I want to handle Scroll:
@
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
QScrollArea *area = new QScrollArea();
(......)
}
@so what i should to do in (......) ??!!
[edit, code tags added, koahnig]
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Please check out the forum for "writing tags around your code sections.":http://qt-project.org/wiki/ForumHelp#e3f82045ad0f480d3fb9e0ac2d58fb01
Did you check out already the "image viewer example?":http://qt-project.org/doc/qt-5.0/qtwidgets/widgets-imageviewer.html It uses a painter too.
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[quote author="Hesam4g" date="1379171433"]i checked it but wasn't useful![/quote]
why wasn't it useful?Beside you can use QGraphicsView if you like.
If you want to stick to the QPainter approach you shouldn't override MainWindow::paintEvent() and do the painting there.Instead you should cretae a simple QWidget subclass, do the painting there and add this widget to the QScrollArea.
