General and Desktop

@stryga42 @Christian-Ehrlicher @jsulm Thanks, I fixed it!

Thanks for the code ! You can use the Q_OS_XXX macros to ifdef your code.

Hi, One of the main issue is: 4.8.7 has reached end of life before Mojave was released. You may have better luck checking with macports or brew if they still provide it.

@cdemuru said in BackgroundRole color change not taking effect in QTableView with stylesheet: It works fine except when I apply a stylesheet. As described in the documentation: "Note: If Qt Style Sheets are used on the same widget as functions that set the appearance of widgets, such as QWidget::setFont() or QTreeWidgetItem::setBackground(), style sheets will take precedence if the settings conflict." Use a custom QStyledItemDelegate.

@Christian-Ehrlicher your answer totally solved my problem. Thank you so much.

@jsulm Its worked!Thanks dude =D

@TomNow99 Yes, I had realized this after I typed my answer, and was thinking of deleting it! So since as you say the accepted answer there is at https://stackoverflow.com/a/13406780/489865, isn't that as good as it gets? But otherwise it refers you to https://stackoverflow.com/a/19256990/489865, where that solution states: Removing a row or column (or even a single cell) from a QGridLayout is tricky First, note that QGridLayout::rowCount() and QGridLayout::columnCount() always return the number of internally allocated rows and columns in the grid layout. Note that it's unfortunately impossible to remove such an internal row or column from the grid layout. In other words, the row and column count of a grid layout can always only grow, but never shrink. So isn't that your answer? You seem to be saying you don't like the answers there! :)

Thank you very much Kent, I fear you are right. I've actually been debugging this issue with Qt support and it seems that the BenQ SW271 is either reporting incorrect information to the operating system or it is being recognised incorrectly by the operating system. In the "About My Mac" window, macOS thinks the screen is 61-inch (3840 x 2160)! And hence the incorrect DPI :-/ I've now written to BenQ's support. The ticket was escalated to the technical team and I'm waiting for reply. Luckily, the printing works perfectly so it's not stopping the app from working correctly at the end of the day.

@ELEMENTICY I'm not with you? Of course you can keep whatever code you want for your application, I was only talking about removing everything unnecessary while you post your minimal code/diagnose what the problem is. Then you can put whatever back in. Meanwhile, I showed you 5 lines of code, and asked for a "yes" or "no" as to whether it worked for you with a QWidget versus with a QMainWindow, which you say is where your real problem lies?

As said above, not the correct forum...ask on the pi support page.

AFAIK, it's the script that was used to bootstrap the port from qmake to cmake so it should do a pretty good job.

It should but better use QObject::findChild<>().

As long as you only use those three functions (which I doubt) it's fine although I would prefer a mutex outside the QList instead. And I would use a QMutexLocker instead manual lock/unlock.

PolarGraph::PolarGraph() { int imageWidth = 600, imageHeight = 600; image = new QImage(imageWidth, imageHeight, QImage::Format_RGB32); image->fill(Qt::white); painter = new QPainter(image); painter->setRenderHint(QPainter::Antialiasing); View.setSize(QSize(imageWidth, imageHeight)); painter->setViewport(View); painter->setViewTransformEnabled(true); Window.setTopLeft(QPoint(-300, 300)); Window.setBottomRight(QPoint(300,-300)); painter->setWindow(Window); painter->setWorldMatrixEnabled(true); World.setTopLeft(QPointF(-10.,10.)); World.setBottomRight(QPointF(10.,-10.)); QPen myPen; myPen.setColor(Qt::lightGray); myPen.setWidth(1); painter->setPen(myPen); for (qreal i = 0; i < 360; i+=45) { painter->save(); painter->rotate(i); painter->drawLine(QPoint(-300,0), QPoint(300,0)); painter->restore(); } QPoint center(0, 0); painter->drawEllipse(center,50,50); painter->drawEllipse(center,150,150); painter->drawEllipse(center,299,299); myPen.setColor(Qt::black); myPen.setWidth(2); painter->setPen(myPen); plotLemniscate(); image->save("lemniscate.png"); plotCardiod(); image->save("cardiod.png"); plotCurve1(); image->save("curve1.png"); plotCurve2(); image->save("curve2.png"); } void PolarGraph::plotCurve1() { // r=2cos(Θ/3) qreal r; for (qreal theta = 0.; theta < M_PI*2; theta += 0.01) { r = qCos(theta/3.); plotRTheta(r, theta); plotRTheta(r, -theta); } } void PolarGraph::plotCurve2() { // r=cos3Θ qreal r; for (qreal theta = 0.; theta < M_PI*2; theta += 0.01) { r = qCos(theta * 3.); plotRTheta(r, theta); } } void PolarGraph::plotLemniscate() { // r^2 = sin(2Θ) // r = +-sqrt(sin(2Θ) qreal r; for (qreal theta = 0.; theta < M_PI*2; theta += 0.01) { r = qSqrt(qSin(theta * 2.)); plotRTheta(r, theta); plotRTheta(-r, theta); } } void PolarGraph::plotCardiod() { // r=1-cosΘ qreal r; for (qreal theta = 0.; theta < M_PI * 2.; theta += 0.01) { r = 1 - qCos(theta); plotRTheta(r, theta); } } void PolarGraph::plotRTheta(qreal R, qreal Theta) { QPoint Pv; QPointF Pw; Pw = QPointF(R, 0.); qreal thetaDegrees = qRadiansToDegrees(Theta); int x; Pv = World2View(Pw); x = Pv.x(); painter->save(); painter->rotate(thetaDegrees); painter->drawPoint(x,0); painter->restore(); } QPoint PolarGraph::World2View(QPointF Pworld) { // Transform matrix from Foley & van Dam _Computer Graphics_ Ch 5.5, fig 5.15 /* View-ViewMin World-WorldMin * --------------- = ------------------- * ViewMax-ViewMin WorldMax-WorldMin * * Vmax-Vmin * V = ---------(W-Wmin)+Vmin = S(W-Wmin)+Vmin * Wmax-Wmin */ QPoint Pview; QPointF PviewF; Vmax = Window.topRight(); Vmin = Window.bottomLeft(); QPointF WtopLeft = QPointF(-5., 5.); QPointF WbottomRight = QPointF(5., -5); World = QRectF(WtopLeft, WbottomRight); Wmax = QPointF(World.topRight()); Wmin = QPointF(World.bottomLeft()); Sx = ( Vmax.x() - Vmin.x() ) / ( Wmax.x() - Wmin.x() ); Sy = ( Vmax.y() - Vmin.y() ) / ( Wmax.y() - Wmin.y() ); PviewF.setX(Sx * (Pworld.x() - Wmin.x()) + Vmin.x()); PviewF.setY(Sy * (Pworld.y() - Wmin.y()) + Vmin.y()); Pview = PviewF.toPoint(); return Pview; }

Dear @Christian-Ehrlicher , thanks. you are right

@glycogen So I have given you a bunch of references/quotes to look through. You can see others did not succeed. And the fact remains that Qt WebKit is not supplied since Qt 5.5. (Though you have instructions from the wiki page you referenced if you want to try it.) And even the author of the dryscape package states it probably should not used. What would you like?

@SimonChoops You seemed to ask several different questions, it's not clear (to me, maybe others) just what it is you want. What resizing did you want/expect? When did "resize text" come into what you were asking? Resize in what way? I see you have lines commented out which had setFont() and a text size number, is that what you want/expect to change? So the font changes size when other things resize??

Hello Christian, I'll will look into the QStyledItemDelegate and see how it works. Thank you for the help!