I have a QLabel inside a QFrame.
Sometimes I have too much text in the QLabel and it resizes the QFrame where it is in.
Now, I want to prevent the QLabel from resizing the QFrame where it resides in.
I don't want to limit the amount of lines or setting the maximum size of the QLabel because if the window size of the app increases, I do want to allow the QLabel to increase in size.
Just want to prevent the QLabel from expanding it's parent.
Any clean way to do it?
Use a QScrollArea (which inherits QFrame), and hide its scrollbars:
label = QtGui.QLabel(text)
frame = QtGui.QScrollArea()
frame.setHorizontalScrollBarPolicy(QtCore.Qt.ScrollBarAlwaysOff)
frame.setVerticalScrollBarPolicy(QtCore.Qt.ScrollBarAlwaysOff)
frame.setWidgetResizable(True)
frame.setWidget(label)
This has the side-benefit that the user will still be able to view any hidden text by scrolling with the mouse-wheel.
Related
I have a QListWidget with some widgets inside:
QListWidgetItem* w = new QListWidgetItem(ui->listWidget);
ui->listWidget->addItem(w);
w->setSizeHint(widget->sizeHint());
ui->listWidget->setItemWidget(w, widget);
However, everything seems to work fine until I resize the the QListWidget (it is embedded into a QDockwidget). Do I have to iterate over all items and resize them manually or is there a simple trick?
It is just a list with items having a button on the left and a button on the right. If the list gets resized (QSize changes) than the buttons gets hidden and a scrollbar appears. I want to have the size of the item according to the list width.
Try setting the resizeMode property to Adjust. This will cause your QListWidget to automatically resize all of the items in the view to the size of the QListWidget anytime the widget is resized.
See the documentation here. Your code will be structured like so:
QListWidgetItem* w = new QListWidgetItem(ui->listWidget);
w->setSizeHint(widget->sizeHint());
ui->listWidget->setResizeMode(QListView::Adjust);
ui->listWidget->addItem(w);
ui->listWidget->setItemWidget(w, widget);
EDIT: Depending on the uniformity of your items, you may also benefit from setting the uniformItemSizes property. QListView can optimize the layout of your view if you set this property.
In my Qt program, I programmatically generate a modal QDialog. I want to show two widgets in this dialog window: A custom widget showing a camera output and a QTableWidget, showing the pixel coordinates of the corners found in the camera image. I generate a QHBoxLayout and add my custom widget and the QTableWidget into it. Then I set this QHBoxLayout as the Layout of the QDialog window. What I want to achieve is to share the available space in the QDialog's window area equally between my custom QWidget and the QTableWidget, horizontally, by using a QHBoxLayout. But I always end up with QTableWidget occupying the whole QDialog area, by overlapping my custom widget. How can I instruct these two widgets to exactly share the QDialog area?? Note that I first add my custom widget and then the QTableWidget into the QHBoxLayout.
Make sure on your custom widget you've specified a minimumSizeHint and a sizeHint, this instructs the QLayout manager that the widget requires a specific space. To have them split equally you'll be best off detecting the size of the QDialog and then specifying the width for both by removing the boundary sizes (spacing between widgets + space to QDialog edge) and dividing it up.
I have a QGLWidget, which I want to resize to a given resolution (bigger than the containing window).
My intention is, that the window expands until the widget fits inside, but can't find a way to do it.
I tried several commands after resizing the QGLWidget to make it work without success.
I will list the results here:
do nothing else: The Widget overlaps the whole window. Eventually it will be resized to fit back into the smaller window
mainWindow.adjustSize(): The widget gets resized to (0, 0)
mainWindow.resize(mainWindow.sizeHint()): see above
mainWindow.resize(mainWindow.minimumSizeHint()): see above
I also read in this thread, that before doing the mainWindow resize I the event loop needs to be run to recalculate the new sizes, so I inserted QCoreApplication::processEvents to do so, without any visible effect.
So how do I resize the window via the widget?
Edit
The GLWidget is not the only widget of the window.
It is embedded in splitter together with a group box.
http://qt-project.org/doc/qt-4.8/qwidget.html#sizePolicy-prop
http://qt-project.org/doc/qt-4.8/qsizepolicy.html#Policy-enum
http://qt-project.org/doc/qt-4.8/qwidget.html#setFixedSize
So assuming that you have your QGLWidget nested inside your QMainWindow as the central widget, you need to set the size policy of your QGLWidget.
For example:
QGLWidget * glw; // in your header for QMainWindow
...
// In your constructor for QMainWindow
glw = new QGLWidget;
this->setCentralWidget(glw);
glw->setFixedSize(500, 500);
this->adjustSize();
Hope that helps.
I have an app that needed to be very similar to your requirements, so I'll post my solution here. An image covering the window which is freely expandable and shrinkable, and can be changed to the original size, and remain expandable / shrinkable after that.
I used a QLabel widget to display the image, but it should work with other widget types too. I created the widget with an initial size and the QSizePolicy::Ignored.
label->resize (w, h); // initial size
label->setSizePolicy (QSizePolicy::Ignored, QSizePolicy::Ignored);
The label widget was in a QVBoxLayout with a few buttons in the window, but this may work with other layout types too.
The window and image widget can be resized to the image's original size with this code:
label->resize (w, h); // change to original size
label->setMinimumSize (w, h); // prevent it from collapsing to zero immediately
window->adjustSize (); // resize the window
label->setMinimumSize (0, 0); // allow shrinking afterwards
I'm a bit new to QT but have to work on existing code. Here's the case:
I have a class extending QDialog. the constructor sets a QGridLayout then adding three other widgets to it. One of the widgets is a QScrollArea containing a QGroupBox. this QGroupBox has a QVBoxLayout and there I'm adding a list of widgets at runtime. The size of the scroll area should grow until a given limit is reached before showing the scrollbars so that they are only used when the dialog would grow too high. I've found that the sizeHint of the outer layout doesn't update when the sizeHint of the scroll area updates. How can I refresh this, or is there a better way to resize the parent dialog?
What about using widgetResizable property of QScrollArea? It should try to resize view to avoid using scorllbars.
I have a QDialog I'm working with. It is made somewhat like a QMessageBox. I noticed that the size of the QMessageBox (and the size of its label) depends on the size of the message displayed.
How would I make the size of my QDialog adjust automatically like a QMessageBox? Presently my QDialog contains a button box and a label, and the QDialog is layout Vertical.
(I know I could just use the message box directly but eventually I will have more complex dialogs.)
Automatic solution:
Use layouts and set size policies to QSizePolicy::Expanding. In QtDesigner, once all your children are placed on your QDialog, then click on the Adjust Size button next layout ones. Your QDialog will be automatically resized at runtime.
Manual solution:
The QWidget class has a method adjustSize that resize the QWidget to fit its content. Just call it when all children are set.
Set your dialog to be expanding, and very small. Then, be sure to set your message before showing the dialog. When shown, it will try to find its proper size, based on the size of the objects it contains. (This happens recursively, so if the dialog isn't the direct parent of the label in which you show your message, make sure everything between the label and the dialog is set to use layouts.)
A TIP : if you try to use "adjustSize()" function when dialog is hidden, it may not be works fine. It would be better to use it after the "show()" function.