I have a QLabel in my application that displays error messages to the user. I would like to make the text of the label selectable so users can copy and paste the error message if needed.
However, when I use the mouse to click and drag over the text, nothing happens - the text is not selected.
How can I make the text within a QLabel selectable by the mouse?
Code
The text of a QLabel can be made selectable by mouse like so:
label->setTextInteractionFlags(Qt::TextSelectableByMouse);
This is found in the QLabel documentation.
You can use that same function to make links selectable by keyboard, highlight URL links, and make the text editable. See Qt::TextInteractionFlag.
Designer
Search for textInteractionFlags under the QLabel menu and set the flag TextSelectableByMouse.
Here is another method, for reference...
You could create a QLineEdit subclass instead, tweaked to look and act like a QLabel,
in the constructor:
setReadOnly(true);
setFrame(false);
QPalette palette = this->palette();
palette.setColor(QPalette::Base, palette.color(QPalette::Background));
setPalette(palette);
I think the accepted answer is simpler and preferable to this though.
Related
Click the button, a table control appears next to the button, click the blank space or the content in the control to close.
I have two ideas:
With the popmenu, can click the blank space or the content in the control to close the control, but it does not meet my needs for a table-type control
New a tableview, but I don’t know how to accurately appear under the button and realize the function of clicking the blank space or the content in the control to close the control
Update：
I need to use Qt to implement a function, but I don't know how to implement it.
The functions are as follows:
Click a QPushButton, and a QTableView is displayed below the button. I can click anywhere outside the QTableView to close this QTableView
There are two things I cannot achieve:
1.How to display the QTableView below the QPushButton (must be immediately below, such as:
(source: upload.cc)
)
2.How to close the QTableView by clicking the blank space outside the QTableView
If you can make all of this in the same window, it's simple...
To position the QTableView below the QPushButton you will use Qt Designer, and setup the QTableView to hide();. And when the QPushButton is clicked, he setup the QTableView to show();.
An show(); example:
QTableView *nametable = ui->tableView;
nametable->show(); //will appears
But to close or hide(); this when clicked in a blank space I don't know how to help you...
I'm new to Qt and the difference between QPushButton and QToolButton is not so clear to me.
I know that a QToolButton is usually used in a QToolBar and it usually shows only an icon, without text, but I don't quite understand the main difference between both.
Does it have any bigger difference?
When should I use QPushButton and when should I use QToolButton?
I would like to know this to use the most appropriate button, and I need to perform some GUI tests and maybe it can be relevant.
QPushButton is simply a button. QToolButton is part of a group of widgets in the QtWidgets module that operate on QActions: QMenu and QToolBar are other examples. As a result, QToolButton is much more complex under the hood than QPushButton.
Some examples of how they are different in practice:
QToolButton is tightly integrated with QAction. Changing the icon, text, or other properties of a tool button's default action is reflected on the button.
You can change the layout of the tool button contents (icon only, text only, text beside icon, text below icon). This is not possible for a QPushButton.
QToolButton supports a "split" button type: a sidebar hot zone opens a menu instead of triggering the default action.
Tool buttons can be created directly in a QToolBar by adding an action. Other widgets must be explicitly added to the toolbar.
A tool button is meant to be displayed in a grid, so it has smaller default internal margins than a push button.
QPushButton is more for "Ok"/"Close" type buttons that contain text with an optional icon.
A QToolButton should generally have an icon.
A QPushButton should always have text.
From Qt doc: http://doc.qt.io/qt-5/qtoolbutton.html#details
"A tool button is a special button that provides quick-access to specific commands or options. As opposed to a normal command button, a tool button usually doesn't show a text label, but shows an icon instead."
When i want a button in the GUI simple with only an icon, I use QToolButton. But when i want a classic button, i use QPushButton.
No big differences,
I'm looking for the simpliest way, using Qt Designer and a little code, to drag text from a QListWidget (apparently there are options of draggable content in Qt Designer) to a QLabel (but I can't find any droppable action option ...) so its text is set to the text of the item we dragged.
Any ideas ?
[C++, Windows, Qt5]
Well, yeah, the most straightforward idea is subclassing QLabel and reimplementing it's
void dropEvent(QDropEvent* event)
QDrag object will help you pass text from QListWidget via it's mimeData, just create one in mouse event handler.
Check similar questions or examples for more information.
Idea for widget:
By default the widget is basically a QLineEdit where the user can input text. The QLineEdit can obviously only display a certain amount of character (limit). The idea would be that once the mentioned limit is reached, the widget should be extended with a popup window which is overlayed other GUI controls (like QComboBox poup window). This popup window would then contain the text which the "QLineEdit" could not show. The poup window size would need to be dynamic to handle multiple lines. When the widget loses focus it will show the QLineEdit box and part of the original text.
What would be a good design for this widget? Would it be possible to extend an existing widget or combine multiple widgets or ?
Tried looking at the QComboBox source code but it is rather complicated.
Update:
How can I modify an existing stylesheet?
For example: if I want to create buttons, which when pressed each modify a single aspect of the stylesheet. One button can insert a margin-left attribute of 10. Another button can make the background colors blue. Lastly, another button can round the corners. The trick here though, is that I dont want to store all the variables and rebuild the style sheet on each button press. I would like to have a simple this->setStyleSheet(this->getStylesheet()+"margin-left: 10px:") for example.
Is there any way to do this?
Here is the code in main.cpp
QWidget wdg;
QHBoxLayout hlay;
wdg.setStyleSheet("border:2px solid rgb(74, 74, 74);");
QPushButton btn;
btn.setStyleSheet("border-radius:5px;");
btn.setText("Hello");
QPushButton btn2;
btn2.setStyleSheet("background-color: rgb(190, 190, 190);");
btn2.setText("Hello");
hlay.addWidget(&btn);
hlay.addWidget(&btn2);
qDebug()<<btn.styleSheet();
wdg.setLayout(&hlay);
wdg.show();
setting and getting style sheet works with QString and so you can use + operator.