QGraphicsView has ~1 pixel margin for QPixmap
I've created a QMainWindow, which sets it's center widget to a QGraphicsView.
The QGraphicsView displays a QGraphicsScene with a single QPixmap inside it.
The whole thing spans across all Screens and just displays a screenshot of all screens in the QPixmap.
This is my constructor:
// These are in the initializer list auto scene = new QGraphicsScene; auto view = new QGraphicsView(scene, this); // Gets a Screenshot of all screens scene->addPixmap(Screenshot::getScreenshotFull()); view->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff); view->setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff); view->show(); setCentralWidget(view);
Now once this window gets displayed, the Screenshot is moved to the right and down by about one pixel. (Which means there is a white border at the left and top screen)
How it should be:
How it actually is (I've made the top border red, left border white):
It seems like the QGraphicsScene indents all contents by one pixel so it is "visually inside" the outer widget/container (QGraphicsView)
Is there any way to get around this and remove that border?
When I used a QLabel and set the Pixmap via that, there was no border. I moved to the QGraphicsView because apparently that one is better if I want to draw plenty of rectangles onto it later on.. is that correct?
This whole thing is a Screenshot tool, so only an overlay where the user can crop out a rectangle (and also I can highlight windows with rectangles), is it a good idea for that to use a QMainWindow and by code only or should I use .ui files? Also is QGraphicsView the right option here? I want to draw a rectangle whenever the user hovers over certain areas.
@mrousavy The solution is to set no frame style.