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Questions tagged [qwidget]

QWidget is key part of the Qt C++ classes. QWidget is the base class of all the user interface elements in the Qt framework.

The widget is the atom of the user interface: it receives mouse, keyboard and other events from the window system, and paints a representation of itself on the screen. Every widget is rectangular, and they are sorted in a Z-order. A widget is clipped by its parent and by the widgets in front of it.

The official Qt documentation can be found here for Qt 4.8 and here for Qt 5.

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Qt Designer how to change background

This is an repost. I am kind of new in QtDesigner and wanted to do something about the uglyness of just some buttons. All i have done yesterday was looking on the internet on how to change the background color of a screen in Qt Designer. How to…
That One
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PyQt: when are widgets with parents deleted?

Let's assume I want to create a dialog box, a child of my main program: from PyQt4 import QtGui, QtCore class WizardJournal(QtGui.QDialog): def __init__(self, parent): super(WizardJournal, self).__init__(parent) self.parent =…
JPFrancoia
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How to get widget background QColor

I am trying to find out the background color of a QWidget or QGLWidget so that I can use it with qglClearColor() to make the OpenGL part appear natively within the widget (without for example a black background). I figured I could fetch…
Nils Werner
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Qt: Can child objects be composed in their parent object?

In Qt, can I embed child widgets in their parent via composition, or do I have to create them with new? class MyWindow : public QMainWindow { ... private: QPushButton myButton; } MyWindow::MyWindow () : mybutton("Do Something", this) { …
Tony the Pony
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Keeping the aspect ratio of a sub-classed QWidget during resize

I'm creating a new widget, by subclassing the QWidget class. I'd like to be able to set a ratio (for its height and its width) for this widget, which will always be maintained. For this, I've always searched, using the Qt5 documentation, Google, and…
Spirine
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Resizing qt widgets when their children are hidden

How would I go about resizing the widget when the retry child is hidden so that it looks as in the first image? The main layout is a QVBoxLayout, the retry child is a widget with a QVBoxLayout as well. I've tried the…
laura
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How to create screenshot of QWidget?

I work at my homework in Qt Creator, where I paint to QWidget and I need to save some part of this QWdiget. I tried to solve this problem: QPixmap pixmap; pixmap.copy(rectangle); // rectangle is part of QWidget, which I need to save …
avalagne
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What Qt widget(s) to use for read-only, scrollable, collapsible, icon list

I'm relatively new to Qt, and am not entirely familiar with the out-of-the-box widgets. I have a somewhat (but not very) complex widget to create, and don't want to reinvent any wheels. What is the best QWidget to use as a starting point to subclass…
Dave Mateer
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Draw Rectangular overlay on QWidget at click

in my project i use a EventFilter for widgets, that are in a QHBoxLayout. If i clicked on an a widget, i want to draw a transparent overlay with blue color over the clicked widget. Is there a way to implement this? greetings
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Render QWidget in paint() method of QWidgetDelegate for a QListView

i'm having difficulties implementing custom widget rendering in a QListView. I currently have a QListView displaying my custom model called PlayQueue based on QAbstractListModel. This is working fine with simple text, but now I would like to display…
Adrien Rey-Jarthon
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Qt - QWidget: Cannot create a QWidget when no GUI is being used

I'm trying to run a simple Qt program, and when doing so, I get a console window mentioning: QWidget: Cannot create a QWidget when no GUI is being used, and the second line This application has requested the Runtime to terminate....., and the .exe…
Simplicity
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How keep a QWidget always on top?

I have two buttons on my QMainWindow. One to btnShowKb and another btnHideKb. When i press btnShowKb it shows an QWidget. I want this QWidget always to be on top of all windows till I press btnHideKb. When its on top, I want both QWidget and…
Surjya Narayana Padhi
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Using any c++ function as a Qt slot

Is there a way to use any C++ function as a Qt slot, without having its class inheriting from QWidget?
Roman Rdgz
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Is it possible to set the opacity of qt widgets?

I know that there is a function QWidget::setWindowOpacity(qreal level) but as written in the documentation this does only work for windows. Is there a way to make widgets that are lying inside layouts opaque too? What I'm trying to do is an…
Exa
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Qt: shadow around window

I can add shadow to widget: QGraphicsDropShadowEffect *bodyShadow = new QGraphicsDropShadowEffect; bodyShadow->setBlurRadius(9.0); bodyShadow->setColor(QColor(0, 0, 0,…
Robotex
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