How to activate keyboard shortcut in QMenu

[Pl45m4]

@dporobic said in How to activate keyboard shortcut in QMenu:

Why is the focus relevant?

Because you can have the same shortcuts on multiple widgets (some key sequences get intercepted by OS e.g. Alt +F4, Ctrl + C). So you could use shortcut A while MainWindow or some child window has focus (Window- or App-Shortcut), to do something and use the same key sequence A (as Widget shortcut) to activate another action while a specific widget has focus.

@dporobic said in How to activate keyboard shortcut in QMenu:

I was aiming for a Application wide shortcut or at least when the focus is on the QTabWidget should it be possible to trigger it.

Then use Qt::ApplicationShortcut at least. But make sure that your key sequence is not used for something else (OS or some other widgets). Try another, simple key (e.g. QKeySequence(Qt::Key_F)), like @JonB wrote.
If the widget / window where your QTabWidget is in, is active, the Window shortcut should work too.

[dporobic]

I did try Qt:ALT + Qt::Key_H before, will try with a single letter then. No, not a Mac, Windows and Linux, tested on both, not working.

[dporobic]

Tested now with all for ShortcutContext and setting the shortcut to a simple Letter, tried H and F, nothing. What I really find strange is even with the menu open, nothing happens:

mCloseTab->setText(tr("Close"));
mCloseTab->setShortcut(QKeySequence(Qt::Key_F));
mCloseTab->setShortcutContext(Qt::ApplicationShortcut);

[dporobic]

Interesting, I've created a QToolButton in the ContextMenu, just created it and gave it the same QAction as the defaultAction and now it's triggered when the ContextMenu is open:

mCloseTab->setText(tr("Close"));
mCloseTab->setShortcut(QKeySequence(Qt::Key_F));
mCloseTab->setShortcutContext(Qt::ApplicationShortcut);

auto button = new QToolButton(this);
button->setDefaultAction(mCloseTab);

Still not working when the menu is closed.

[dporobic]

Giving the QToolButton the QTabWidget as parent seems to be working even with the menu not shown. Just giving the QAction the QTabWidget as parent doesn't work without the QToolButton.

mCloseTab->setText(tr("Close"));
mCloseTab->setShortcut(QKeySequence(Qt::Key_F));
mCloseTab->setShortcutContext(Qt::ApplicationShortcut);

auto button = new QToolButton(parent);
button->setDefaultAction(mCloseTab);
button->setFixedSize(0,0);

It's a workaround, but one of the ugly kind. Any idea how to fix this? Is this a bug?

[Pl45m4]

@dporobic

Looks like there is something wrong with shortcuts and contextMenus in general (I dont know if bug or if we dont use it correctly).
Your hierarchy is somewhat like this:

• Top level window / MainWindow
  • TabWidget
    • TabWidgets TabBar
    • ContextMenu
      • Action with shortcut

And here is the problem... You can't say if the action actually receives the key event / shortcut, due to multiple parents and children.

At least on Window Ctrl + F4 is used (Shortcut List).

[SGaist]

Hi,

IIRC, you should add the action to your main widget using the addAction method.

If you have centralized actions that can be found in several places, you should also centralize their creation and propagate them as needed. Or provide an accessor like QDockWidget's toggleViewAction.

[Pl45m4]

@SGaist

But why are these actions and shortcuts in contextMenus possible, if you can not trigger them, even when parent widget has focus or is the only widget? What is the use case for this?

[SGaist]

Because it would not make sense to have that restriction because you can build these menus and actions in several different ways and that Qt cannot know that you are actually on purpose adding a shortcut to an action that will only be available in a popup menu.

[dporobic]

@SGaist said in How to activate keyboard shortcut in QMenu:

IIRC, you should add the action to your main widget using the addAction method.

The addAction method on the parent seems to be working indeed, need to think about if I should distribute them differently:

mCloseTab->setText(tr("Close"));
mCloseTab->setShortcut(QKeySequence(Qt::Key_F));
mCloseTab->setShortcutContext(Qt::ApplicationShortcut);

parent->addAction(mCloseTab);

@Pl45m4 it is indeed a close action though it looks like I should be using Ctrl+W which is more cross platform.