I was looking at this article
How to make a Qt Widget grow with the window size?
but when i got to the answer I got stuck on "activating" the central widget. I notice an icon with a red circle so I guess that means its disabled. I've been searching the net to try to figure out how to "activate" it but I am not having any luck.
Can someone please help me out?
Have a look at the layout system.
That icon does not mean your QWidget is disabled, that just mean you do not apply a layout on it.
Try to press like Ctrl+1 in order to apply a basic layout. If nothing has changed, you might need to put a QWidget inside the central widget first and then apply the layout.
Related
I know how to set my application to start in full screen by settin gthe following in the main.cpp:
MainWindow w;
w.setWindowState(Qt::WindowMaximized);
w.show();
However, when in full-screen, all my widgets goes into the left-top corner.
How to centralized my widgets when in full screen ?! and alike when minimizing the screen to normal size ?!
(a tutorial will be much helpful too)
You need to use layouts when designing your GUIs.
You can look at the Layout Management page on the Qt documentaion.
Also the following video on layouts might be helpful.
Qt - by default - doesn't do anything with window contents when you re-size it. All widgets'll be exactly the same size as were before, so behavior you describes is perfectly fine.
To force window contents to adjust position and size of your widgets you must associate Layout Manager with container.
The easiest way to do it is to fire up Qt Creator and open desired window with UI desinger. Then right click on the container you want to associate Layout Manager and use layout item from context menu.
I thing those article and examples should help you.
I'm setting up a small code editor using QT and following this example. However, i'm curious on how to create windows within windows or widgets within widgets. I'm trying to achieve something similar to these:
http://i.stack.imgur.com/Vn8Ut.png
http://www.hanselman.com/blog/content/binary/Windows-Live-Writer/Download-Visual-Studio-2013-while-your-f_1431E/image_4eb5427c-1ae7-4464-9c26-2282fe8d06c3.png
Is there an example of overlaying widgets like this?
Any alternative soloution for QMessagebox for IOS development (QWidget application only)?
I gave an example of getting another QWidget to be embedded and painted on top of another one. Let me know if you have any questions about how it was done.
The PopUp flag and Qt::Tool options are also relevant.
Be sure to check out: the ToolTip property of a QWidget and the WhatsThis property of QWidget.
http://qt-project.org/doc/qt-5/qwidget.html#toolTip-prop
http://qt-project.org/doc/qt-5/qwidget.html#whatsThis-prop
There are also other ways to make borderless, focusless windows that hover and disappear quickly on command. The Window Flags and Widget Attributes in Qt are very powerful when you are looking to modify Qt Widgets.
When you parent a Widget to another widget, it will draw itself on top of the other. Then you just need to resize and position it properly.
Also subclassing existing widgets can give you more options.
Draw text on scrollbar
Also common Qt::Tools that you will find are QDockWidgets. They are awesome!
Hope that helps.
Take a look at Qt Namespace especially Qt::WA_LayoutOnEntireRect and Qt::WA_StyleSheet. Pass it as a widget attrybutes. The second option looks promising but you have to create style sheet for QWidget.
I have a QVBoxLayout which has content dynamically added to it. I simply want to make that layout scrollable as the content overflows. What is the correct way to achieve this in Qt Designer, or do I need code as well?
I've seen a mixed bag of examples, but none get low level enough to show exactly what needs to be done.
Thanks!
I have found a solution by doing the following.
In Qt Design view, create a QScrollArea. Then drag your existing QVBoxLayout into the QScrollArea. Right-click inside the QScrollArea (not inside the layout) and select "Apply Layout". Then choose a layout (I chose a vertical layout). That's it.
Hope this helps!
Is it there a way to set a QMainWindow to be non-resizible in Qt Designer? I am seeing lots of coding examples but I want to do as much UI customization in Qt Designer as I can. So far I can only get this by setting the minimum size and maximum size to be equal, but still there is the resize arrow in the corner of the window and a "maximize" button on the top of the window.
When you select the QMainWindow, the properties of the object does contain a field for sizePolicy, both horizontal and vertical, as mentioned by the answer of #jester and you can set those to fixed.
I have found that doesn't always work and was never sure why (perhaps to due to layouts), but as you've found out, if you set the minimumSize and maximumSize fields to the same value, it does what you want.
As for the resize arrow and maximize button, I have never been able to do that from Qt Creator (designer), so I would say it's not possible. However, just one line of code is all you should need in the constructor of your class: -
setWindowFlags(Qt::Window | Qt::CustomizeWindowHint);
By default, the window flags include Qt::WindowMaximizeButtonHint. By setting the above flags, you're stating that you want to customise the window to include the specified elements. This will also remove the minimise button, so if you want that too, you should add Qt::WindowMinimizeButtonHint
I am not using Qt Designer; I am just writing a subclass of QMainWindow made from scratch. The solution I found for having a non-resizable window is to call setFixedSize on the QMainWindow after you have set up all your widgets and layouts. If you have set things up well, then you don't have to pick a size manually; you can just get the size from sizeHint. The line of code I used inside my subclass of QMainWindow is:
setFixedSize(sizeHint());
I tested this in Qt 5.5 on Windows 8.1 and everything looks fine: the maximize button gets disabled but the other buttons are still there, and the cursor does not indicate the possibility of resizing when the user moves it to the border.
use the setFixedSize property for the QMainWindow. In designer, if I remember correctly, you can set the horizontal and vertical sizePolicy to Fixed.
Sadly there is no option to do that; in VS you may find an option in the editor, to remove the mouse trigger that resize the window; but for some reason, QT5 does not have one.
I tried to use sizePolicy and set it as fixed for mainWindow; but this does nothing for both the horizontal and vertical policy.
To solve the problem, I did set my mainwindow minimum and maximum size as the same values; and when you run the application, the mouse cursor won't be enabled for resizing.
It is an ugly way to do something so simple, but this is the only way I found in QT designer, without use code.
I solved the problem of Qt5 which is displaying mouse arrow resize window even with window having fixed size, but in Python, but you can make modifications for C++.
MainWindow.setWindowFlags(QtCore.Qt.MSWindowsFixedSizeDialogHint)
It's an old post but I want to help if someone need it.
I found a way (not so beautiful) but it works directly from QTDesigner.
You can lock the resize by writing the values of height and width also inside "MinimumSize" and "MaximumSize" property.
Oviously also set "Fixed" on vertical and horizontal as told by other users.
This will remove the button to enlarge the window.
I have the following problem:
I have added a spinner to my qt Tool Bar, which is located from top to buttom. This works fine. But now I want to order some buttons in a special order, but with mainToolBar->addWidget(button_name) it would be among one other. So how can I solve it? I tried to make a new widget "widget_1" and added some buttons to this widget, but when I write mainToolBar->addWidget(widget_1) nothing appears, only the one slider I have already added. Can anyone help me?
Thanks a lot :)
Well, just forget something.
select the widget and then layout in a form or whatever layouting you prefer.
And that's it. now, the widget will be shown in toolbar. it's because of size
and child widgets position. by layouting, everything will be resized and position
correctly.