I have implemented a custom child indicator for a QTreeWidget as a QPushButton and still in the process of making it look like the original. My question is if anyone knows what control does Qt use for the child indicator, or is it some other control, like a customized QLabel? I have implemented it by sub-classing QPushButton with QPushButton::setFlat(true) and QPushButton::setCheckable(true). But I still see the inflate/deflate behavior of the control when I click on it, just like it happens with QPushButton. So, should I continue styling the button until I get the desired behavior, or should I sub-class another Qt widget instead?
Here's the screenshot of a typical QTreeWidget with a child indicator. I want to know what control does Qt use for it:
Related
On many web-pages nowadays, you'll frequently see instant tooltips with an arrow that points to their target, similar to:
https://www.w3schools.com/css/tryit.asp?filename=trycss_tooltip_arrow_bottom
(More specifically, I'm looking for something like: https://www.youtube.com/watch?v=0Jedht9Arec)
How would you exactly replicate this in QT? I'm not necessarily looking for something super automated, just something that can be given a position to appear at, and a function call to remove it. Furthermore, if possible, it should have curved, anti-aliased corners.
I've tried using custom QToolTip, but it's behavior does not meet my standards. I've also tried a custom QDialog with a Popup flag, but it freezes the dialog it appears above.
Any recommendations on how to proceed?
As requested by two comments below, here is the code for the QDialog scenario previously referenced. Prepare yourself, it's a lot:
// Assuming "this" is the parent dialog
QDialog* popup = new QDialog(this, Qt::Popup);
popup->show();
This code blocks mouse hover events of the parent dialog (the "this" object), thus making it unsuitable as a tool-tip replacement.
You can use QWidget::setMask to specify custom shape of a widget. Additionally you'll have to set widget's window flags to include Qt::ToolTip.
I'm new to Qt and fairly new to C++ but I need help with this issue.
I have a custom class called HybridStack and I want it to extend a QStackedWidget and a QMainWindow.
I want it to extend a QStackedWidget so that I can use as many pages as I need and I want it to extend a QMainWindow so that I could be able to make each page have it's own MenuBar with different content of menu for different page.
I want to add this custom class HybridStack to Qt Designer by
promoting it from a QStackedWidget.
Is this possible? If it is, can you brief me on how to do this? If it's not possible then what's an alternative? Most importantly, I need to use it in the Designer because I need to use qmake
You can't derive from both QStackedWidget and QMainWindow, because both of those are in turn derived from QWidget. If you did so, you'd end up with the Dreaded Diamond. You'll have to use composition instead.
Even then, I'm not sure if it would work correctly to put a QMainWindow within a QStackedWidget, since it is designed to be a top-level item (i.e. its shown directly as a window, not embedded within another QWidget). Another way of accomplishing what you want (menu bar changing when the you change tabs) would be the following:
Make your top-level item a QMainWindow
Make the central widget a custom widget derived from QStackedWidget
When the item showing in the stack widget changes, you can call QMainWindow::setMenuBar to change the menu bar. Each widget within the QStackWidget could have its own QMenuBar instance that it uses for this purpose.
I am trying to make a dialog box like below in QT, the only problem is I have no idea what the widget is called. The bar on the left is like a tree-view widget, but when you click on it, it updates the text on the right. Does anybody happen to know what the widget is called or what widget(s) are required to perform this? I am using QT C++ on Windows.
There is an example with Qt showing you how to do this.
https://doc-snapshots.qt.io/4.8/dialogs-configdialog.html
If you're using Qt Creator as IDE, you can find it under the "Demos and Examples" tab in the Welcome Screen too.
It uses a QListWidget for the selector, and QStackedWidget to control the different pages. Connect the currentItemChanged signal of the list widget to change what page should be shown. Everything you'll need is in configdialog.cpp.
If you realy need to add QPushButton into QListWidget, use setItemWidget, or into ListView use QAbstractItemView::setIndexWidget
Ok this seems pretty straightforward but how to do this? The edit controls send an EN_KILLFOCUS message, but I can't really find something similar for the treeview control.
Exact situation: Parent window (a property sheet page) creates a custom control that has a treeview on it (just the plain old SysTreeView32).
My best idea until now is to subclass the control that holds the treeview and the treeview itself, but thats no joy...
The message you are looking for is NM_KILLFOCUS.
In QMainWindow I have 2 QSplitters. In that splitters I have QTextEdit, QLineEdits, QTableWinget, Ragio buttons and so on... I want to know if somthing has been chaged after pressing File->New menu button. Is there any general method for doing this?
Somwhere I have read that it is recomended to use isWindowModified() function of QMainWindow, but seems it doesn't work.
setWindowModified() does not propagate the windowModified flag to the parents. This bug is described here: https://bugreports.qt.io/browse/QTBUG-20150. I have just tried it and indeed it did not work.
The isWindowModified() could be useful here since according to http://doc.trolltech.com/4.6/qwidget.html#windowModified-prop it propagates up to the parent.
However, I think you would need to set this yourself. For example, if you clicked the new button which leads to some text being inserted into a QTextEdit, you still need to call QTextEdit's setWindowModified() function - which will then propagate up to your QMainWindow - and you can just check QMainWindow afterwards. (However, you wouldn't know which children were modified)
Maybe you should have a look at QWidget::changeEvent.