I need Qt Dialog with ok and cancel buttons with standard functionality, placed on the right side of its layout. I need to inherit from it and add other widgets to its layout. I can implement it myself, but maybe there is something standard, in that case I prefer to use it, since it will be more portable.
QMessageBox shows a message, I need something more general, only QDialog and standard buttons, or maybe QDialog has an option which activates them.
Subclass QDialog and use a QDialogButtonBox for the standard buttons (docs).
In case you use QT Designer, learnpyqt.com has this nice tutorial in which they describe how to build a QDialog with multiple input fields.
QT Designer can be downloaded as described here on stackoverflow in a comment.
Related
I'm coding a simple text editor with only few basic features.
At the moment it has a QMainWindow with QTabWidget set as it's centralWidget.
What I'm implementing now are some shortcuts; ctrl+s to save, ctrl+o to open, and ctrl+t/ctrl+w to create a new tab/close the current tab.
I know how to implement all the features, but the question is where to implement the features?
Should all the shortcuts be members of QMainWindow and let it take care of everything, or should I try separating the shortcuts into their correspoding classes?
For example, creating a new tab (ctrl+t) would be part of QTabWidget.
Now what about ctrl+s (save, duh), should it be part of QTextEdit since it's the text I'm saving, or..?
Basically my program contains three classes; QMainWindow, which contains QTabWidget, and each tab is a QTextEdit.
Your setup sounds a lot like many of the applications I've built.
I generally handle shortcuts via the QAction::setShortcut() method, so it's really more about where does it make sense to store the QAction objects. This usually ends up being my MainWindow class as a lot of the actions are all used in the MainWindw's menus. When these actions are triggered, the result is usually that the TabWidget is notified which in turn notifies all the necessary tabs and can handle things like a "Close All" action triggering only one save prompt.
However, if it doesn't make sense to store those QActions on the MainWindow object, then I don't, as in the case of the context menu I usually have available on my individual tabs.
Hope that helps.
Designing an interface with QT4 I have been advised that using multiple "Tabs" at the top of an interface to navigate different pages is not the most elegant design. Instead I would like to do something similar to the Options dialog in QT Creator 4.8.
Does anyone know the name of a widget that resembles that in the Options Dialog of QT Creator.
ex. Click Tools->Options... In QT Creator.
Notice the layout on the left hand side of the screen, which to me seems nicer than only tabs across the top of the screen.
Thanks for your help!
It's QLiveView/QListWidget with delegate that draw icon and string.
Here is link to documentation for QListView, If you are not happy with default list view delegate then you can create your own QItemDelegate to handle custom drawing. Here is sample code to create custom QItemDelegate
I just stumbled upon this implementation of a ribbon interface this morning. Maybe this is helpful to you?
http://qt-project.org/forums/viewthread/4214
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
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.
Whenever I use the signal/slot editor dialog box, I have to choose from the existing list of slots. So the question is how do I create a custom named slot?
right click on the main window and select "change signals and slots" and add a new slot.
It will appear in your signal slot editor.
This does seem to be possible in the version of Qt Designer 4.5.2, but it can't be done from the Signal/Slot Editor dock-widget in the main window.
This is what worked for me
Switch to Edit Signals/Slots mode (F4)
Drag and drop from the widget which is to emit the signal, to the widget which is to receive the signal.
A Configure Connection dialog appears, showing the signals for the emitting widget, and the slots for the receiving widget. Click Edit... below the slots column on the right.
A Signals/Slots of ReceivingWidget dialog appears. In here its is possible to click the plus icon beneath slots to add a new slot of any name.
You can then go back and connect to your new slot in the Configure Connection dialog, or indeed in the Signal/Slot Editor dockwidget back in the main window.
Caveat: I'm using PyQt, and I've only tried to use slots added in this way from Python, not from C++, so your mileage may vary...
Unfortunately this is not possible in Qt4.
In Qt3 you could create custom slots which where then implemented in the ui.h file. However, Qt4 does not use this file so custom slots are not supported.
There is some discussion of this issue over on QtForum
I am able to do it by:
In MainWindow.h, add the line:
public slots:
void example();
in the MainWindow class.
In MainWindow.cpp
void MainWindow::example() {
<code>
}
This doesn't seem to be possible in a simple way.
The designer only allows you to promote existing widgets to your own custom widgets. yet it doesn't allow you to connect the signals and slots of the class of promoted widgets.
The way this is possible is creating a plugin for the designer as is described here and in the pages that follow it.
The normal course of action is to promote a widget to your own class and then to connect it manually in your own code. this process is described here
It is not possible to do it, because it means you would add a slot to an existing Qt class like QPushButton which is not really the way to go.
You should create your own QWidget eventually by subclassing an existing one. Then integrating it into Qt Designer as a plugin as suggested. Having your own class allows you to add/modifiy the signals/slots available as you want.
Don't forget about the slot auto-connection features. There are a few drawbacks, like having to rename your function if you rename your widget, but we use those a lot at my company.
You can use the magic slot format of
void on_objectName_signal() {
// slot code here, where objectname is the Qt Designer object name
// and the signal is the emission
}
The connection to this method is established by the method connectSlotsByName and whenever the signal is emitted, this slot is invoked.
Maybe it'll help.
By default you have to choose from the existing list of slots. But you can add slot by right-clicking at you object in the list at right side of designer and choose "slot/signals" and add your custom slot/signal. After that, you can choose it in signal/slot editor.
click the widget by right button
promote the widget into a class you defined
click the widget by right button again
you will see that signal and slot is editable