I hope to create a "NEW" listview like QML Exmaple with native Qt classes.
Exactly I want to make a listview which works like below.
It looks like a QML example but slightly differs. QListView has a limitation for it's layout, right? I want a hint for overcoming the problem.
You'd want to use GridView instead of ListView. That'll get you a step closer to making your UI look like what you have designed. However currently Qt Quick only supports fixed cell sizes of grid items, which means you won't be able to expand the cell size of just one item. All you can do is set up the cell size to fit the expanded item so that every grid item will take up as much space as it could possibly need. Then you can alter the dimensions of each item without worrying about fitting issues.
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I want to make a GUI with QT Creator 4.9.1 ,my aim is to split my mainwindow into 5 areas(no multiple window), my question is how can i realize that, or better what is the best Layout solution for that?
I have allready tried to set a datagrid and add inside that grid 5 frames, the problem is that the first frame has the size of my whole datagrid and i can't resize it.
My next try was to add 5 different datagrid on my GUI but i can't set the size of the datagrid's in QT like wpf or forms.
My last try and my current solution is without any layout, i add 5 fame's inside my mainwindow but that isn't a good solution.
Inside visual studio i realize that with datagrids i create for every menu one grid and change the visibility when the user need a other (area 2).
friendly wishes sniffi
The suggestion to using dock windows may be a good one to investigate, particularly if you need to allow the user to resize or move things around. However, to get the layout you want with just layouts, the trick is to use multiple layouts.
Create a vertical layout for the left-hand side and add the four widgets to it. Create a horizontal layout and add the vertical layout in the first column and your tall, fifth widget to the second column. Apply the layout to your main windows, and that should give you roughly what you're looking for.
You'll almost certainly need to play with the row stretches on the vertical layout to get the proportions you want, and with the column stretches on the horizontal layout.
The alternate would be to create a grid layout where the widget on the right side spans four rows, but I think you'll be happier with the mix of the two layouts.
When I run my program it will display all content properly, and when I resizing the main window, the layout along with all associated widgets remain fixed, rather than resizing with the main window. I used to increase my all widget and listWidget respect to window computer resolution size but still this not one work properly.
I used this one code finding the system height and width.
QWidget widget;
widget.resize(widget.width(), widget.minimumHeight());
QRect rec = QApplication::desktop()->screenGeometry();
int h = rec.height();
int w = rec.width();
// Increasing the listwidget size
ui->listWidget->setFixedHeight(h);
ui->listWidget->setFixedWidth(w);
//increasing the button size
ui->pushButton->setFixedHeight(h0.2);
ui->pushButton->setFixedWidth(w0.2);
At this link you will find two screenshots that illustrate my problem.
Please resolve to solve my problem. Thanks very much in advance.
When defining the layout of your windows and forms in Qt Designer you have to define each element of your form in advance, in order to have a working layout.
This solution is based on the screenshots provided in the comments to the question. Follow these steps:
Add an empty widget to the central area of your form, if there is nothing there. It will be used as a placeholder for the controls you will add later, and of course you can replace it with whatever widget you want. But you need it there to define a proper layout.
In the property panel, set the horizontal QSizePolicy of this widget to MinimumExpanding.
Add an horizontal spacer to the left side of your progress bar.
Define a minimum/maximum width for the white widget on the left (I guess it's a text area). As an example set the maximum width to 200
pixels.
Make the same for the QTabWidget on the right.
Give a minimum height to the Groupbox on top.
Then give the grid layout to the MainWindow.
You should get something similar in the designer view (I use a dark theme, yours will have different colors of course):
If you complete all steps you should have a nicely resizing window.
For the future: remember to integrally define your layouts, also using placeholder widgets when needed, read carefully the documentation about the widgets size policies (there are several, you need to play with them to fully understand each one) and keep in mind that Qt uses a container based approach which is different, as an example from those used by the .Net framework that relies on the concept of anchors.
EDIT : to answer questions in the comments
You will need to add a layout to any widget that contains other widgets, e.g. adding controls to your groupbox will require to give it a grid, horizontal or vertical layout in order to scale nicely on resize. Again use spacers and size policies to make it look the way you want. If you need to add or remove controls, or change their positions, you may need to brake the layout, rearrange and then set it again.
You can also select groups of widgets and give them a layout e.g. vertical, than another group and set them horizontal and so on... then give a grid layout to the container widget to build a compound layout.
There are endless possibilities, you just need to practice and go through trial and error as for everything else...
You can also do it all programmatically, check the Qt widgets documentation for this. But for complex layouts I would not go that way: it's a lot of code... and you have to compile and run to test every modification.
Using the QtCreator, within the designer you can simply right-click on the parent-widget and add a Grid-Layout.
This one resizes it's children to it's dimensions.
I want to make something like a gridlayout but the layout must decide how many elements can be fitted in a row, and when the row is full continue with the next row.
QtGridLayout also fixes the columns width.
I want to something like this (this pictures was manually organised in Horizontals and verticals grids)
When the image size changes one of the buttons goes to first row.
((In this compositions both images looks with the same size, but actually second one is wider than first one).
Some one answer this question but remove it, so the credits are for my unknown friend.
Qt have an example named Flow Layout Example for a widget based form and another for Graphics View widget.
I have a table view in PyQt that needs to have an image in every cell.
I have used delegation of a label (and added a pixmap to that label). But the problem is when I add 12 cells (12 images of size 60x30 pixels), the table becomes too slow, and I need to have a table that contains hundreds of images. Should I be using another delegation? Or is it just not doable with a table view? If so, what is the best widget for such a task?
Any answer for Qt or PyQt would be highly appreciated.
I think you should try using QGraphicsView for your purpose. Its much faster to render images on it.
One clever way to do is created a huge graphicsitem which mimics a table based on ur rows and columns count.
then add children graphicsrectitem item as each cell container.
lastly add the images as qgraphicspixmap item as children of the rectitem. this way u can make it quicker and also interactive since u can select them individually and also make them movable inside the cell by user by checking collision detection to make sure they are not pulled outside the cell boundary.
hope that provides u an alternative.
QListView provides an icon mode where you can stack your images in a grid.
For those of you who haven't been reading my Qt questoins, I am learning Qt for a project. I have only limited experience with GUI design at all, and not in Qt.
I've got a horizontal layout that I want to populate with some buttons. I can feed these buttons in just fine, but my formerly-square buttons are stretched horizontally to take up more space.
I want to let the layout manager determine the best way to size these buttons, but I also want their original proportions to remain intact. For instance, if I start would with 32X32 buttons that need to shrink to fit all of them in the layout, I want them to shrink proportionally so that the width to height scale is maintained. 20X20, 16X16, 12X12 would all be just fine, but 24X16 would be an example of dimensions that are unacceptable.
I've tinkered with size policies on the buttons and stretch options. I'm not seeing, even after reading the QPushButton and QHboxLayout classes how to do this. How is it accomplished?
Thanks.
As long as I understand the question correctly, I think what you want is QBoxLayout::addStretch(). This will add a spacer object that fills the unused space. So the buttons will have their ideal size and the spacer will fill the rest. You can try experimenting with this in Designer, it's easier than the write/compile/run cycle.
You should take a look at the answers to this question. This is a recap of my answer there.
You need to create a custom derivative of QLayoutItem, which overrides bool hasHeightForWidth() and int heightForWidth( int width ) to preserve the aspect ratio. You could either pass the button in and query it, or you could just set the ratio directly. You'll also need to make sure the widget() function returns a pointer to the proper button.
Once that is done, you can add a layout item to a layout in the same manner you would a widget. So when your button gets added, change it to use your custom layout item class.
I haven't actually tested any of this, so it is a theoretical solution at this point. I don't know of any way to do this solution through designer, if that was desired.