@raven-worx I tried the following but didn't work out.. QGraphicsPixmapItem* item = new QGraphicsPixmapItem(QPixmap::fromImage(qImage, Qt::AutoColor)); m_ViewerScene->addItem(item); QGraphicsRectItem* rect = new QGraphicsRectItem(m_BoundingBox); m_ViewerScene->addItem(rect); rect->setParentItem(item); m_ViewerScene->update(); //add the resized QGraphicsPixmapItem to the pixmap item->setPixmap( item->pixmap().scaled(QSize(128, 32),Qt::IgnoreAspectRatio, Qt::SmoothTransformation)); qInfo()<<"Rect resize props:::"<<item->childItems()[0]->boundingRect(); m_BoundingBox = item->childItems()[0]->boundingRect(); later I'm drawing box, on the image in an other viewer, with m_BoundingBox. [image: 02c5c881-2cce-4791-bba4-27f853945931.png] The grey area within the blue rectangle will be resized to 128 * 32, and then the red rectangle would be added on the resized image. How to get the co-ordinates of red rect on the resized image?

@mrjj Sorry for not mentioning this before, I already tried a Gaussian Blur, it didn't help. The data is have is in the form: (xCood, yCood, zCood, value) For the first phase I am ignoring zCood. The problem comes with the sample data granuality as data is something like: (0,0), (0,100)..............(0,1500) (100, 0).(100,100)........(100,1500) ..... ..... (1500, 0).(1500,100)........(1500,1500) I have a canvas of 1500x1500 The image before gaussian (The border is part of a layer above the image, so they aren't going anywhere soon): [image: 564300eb-b6df-46e3-a59c-cbf0e365343a.png] After Gaussian Blurring (and some some interpolation on my part)(the data is a little different in both cases and I have done this in a separate application): [image: ce602226-98b9-4337-a5ed-e1972bdd128e.png] As you can see, the output still has some boxiness to it. Also, doing it like this is just removing the sharpness of the image [it is eventually meant to be used to visualize input data not be a sunset image. Not to mention I am going too far with the blurring here making it really heavy for a repaint]. EDIT: Forgot to mention, I am using a continuous hue change here w.r.t value. But it seems that the proposal is for limited number of colors making the output even more blocky and blurring even more useless. EDIT 2: I eventually used the 2D shader for openGL. Latest output: [image: 9f0a0667-bd19-4e0e-aaeb-51113027e7da.png] Seems the most promising one yet

@sm4ll-3gg said in How to resize QListView row to index widget size: what I should read to better understand Model / View / Delegate programming? Basically everything I know comes from Advanced Qt Prgramming: Creating Great Software with C++ and Qt4 It is normal to set new delegate for each item if I need to show heterogeneous data in list? No. What I would do is create a QStackedWidget with the possible combinations, use that as base and display the correct page based on the data in the index

@Ocram10 said in Resize QMainWindow and QDialog: proprietà di windows "Ridimensionamento e layout" Dove trovi questa variabile?

@Fuel the exemples in pyqt-master do it automatically but i don't understsnd what event or property they use

@Ashutosh_Sachdeva You can try online installer to install Qt. My Qt setup installed using online installer has this header file. Also as stated in your other thread make sure you have QT += quickwidgets in your pro file.

@mrjj I don't want to resize it via a dialog. I need to do that with the mouse (manually)

@Gianluca86 You can make main window bigger and move the splitter. then it should be bigger.

Put the list widget in a layout. Here's more on layouts in Qt.

Hi. already fixed in https://bugreports.qt.io/browse/QTBUG-46074

@M4RZB4Ni yes, that is normal. Printer have many more pixels. so image seem smaller. Read docs. they have example of scaling stuff. This sample takes snapshot and scales it. void MainWindow::printshot() { QPixmap pix = QPixmap::grabWindow(QApplication::desktop()->winId()); QPrinter printer(QPrinter::HighResolution); printer.setOrientation(QPrinter::Landscape); QPainter painter; painter.begin(&printer); double xscale = printer.pageRect().width() / double(pix.width()); double yscale = printer.pageRect().height() / double(pix.height()); double scale = qMin(xscale, yscale); painter.translate(printer.paperRect().x() + printer.pageRect().width() / 2, printer.paperRect().y() + printer.pageRect().height() / 2); painter.scale(scale, scale); painter.translate(-width() / 2, -height() / 2); // note uses the form width/height! use pix.h/w if random image painter.drawPixmap(0, 0, pix); painter.end(); }

@the_ Yep its a nice few liners and not really dirty as sizegrip is made for such task so its not abuse or anything :) But sometimes having the grip there can be issue.

@eduardo_parra said: but the cursor detect the margins What margins? Do you mean for something inside the docks?

I found very usefull this class, I added some code to handle correctly a maximized FrameLess Widget. In void FrameLess::mouseMove(QMouseEvent *e) { if (_dragStart) { if (_parent->isMaximized()) { //this will handle correctly dragging when it is maximized maximizeWidth = _parent->width(); //maximizeWidth is an int attribute _parent->showNormal(); } if (_dragPos.x() > _parent->width()) _dragPos.setX((_parent->width()*_dragPos.x()) / maximizeWidth); _parent->move(e->globalX() - _dragPos.x(), e->globalY() - _dragPos.y()); } if (!_mousePress.testFlag(Edge::None) && !_parent->isMaximized() ) { //this prevent resizing if it is maximized [...] Now I'm wondering if there is a way to implement Windows 7/10 autosize function (the function when you drag a window on top/left/right/bottom edge of desktop and it will maximize/resize to half desktop size) on a frameless widget!

Hi, No, it's something you'll have to implement yourself. You'll probably have to create an event filter that will re-send any relevant event to your other windows.

Hi If you use layouts and put the buttons in one. Then no need for any code to do resize. So using layouts is how you do in Visual Design. Try this : Make new project open the mainwindow UI Place a button in the empty mainwindow. Right click empty spot on form Select the Layout menu (bottom) Select Layout Horizontally

BTW: If you want a fancy GUI that doesn't look / behave natively then you can use QtQuick for that. Besides layouts it has anchors, too.