[Qt-interest] QWidgetAction stays visible after triggered() signal and trigger() slot.

[John Weeks]

I was wondering if you ever found a solution to this problem. 

I have a similar problem- a cascade of contextual menus, at the innermost level a QWidgetAction that displays a custom color picker inside the menus. After trying numerous variations, I finally concluded that the only solution was to have the widget inside the QWidgetAction emit a signal, connect that to a slot in the code that puts up the menu, and use that connection to call QMenu::close on the top-level menu. Here's a screen shot of the menus:



The essence of the code is like this:

In the constructor for the tool-bar-like window:

	ColorPickerAction = new WMColorPickerAction(this);
	connect(ColorPickerAction, SIGNAL(colorChanged(const QColor)), this, SLOT(onColorChanged(const QColor)));
	CursorColorMenu.addAction(ColorPickerAction);

The color picker itself uses a QTableWidget with custom delegate. It emits a signal when a color cell is clicked:

void WMColorPickerWidget::onCurrentItemChanged(QTableWidgetItem * current, QTableWidgetItem * previous) {
	Q_UNUSED(previous);
	if (current) {
		emit selectedColorChanged(current->backgroundColor());	// TO DO: Igor will need RGB16Color, not QColor
	}
}

The toolbar-like window (InfoPanel) ultimately gets a signal from that:

void
InfoPanel::onColorChanged(const QColor theColor)
{
	changeCursorColor(theColor, menuCursorNum);
	TraceNameMenu->close();
}

TraceNameMenu is the top-level menu, the one with "Style" at the top.


Regards, John Weeks


> What I need is a QMenu that displays a button, and when I press the button, 
> it triggers an action and goes away. I have managed all except the last 
> part: the menu doesn't disappear (more specifically: the program blocks 
> execution on QMenu::exec(), no matter if trigger() is executed or not.)
> 
> What is the correct (!) way to let QWidgetAction behave like a simple 
> QAction in QMenu (i.e. to remove the widget after triggering the action.)? 
> Take the the example below as a starting point:
> 
> class A : public QWidgetAction {
> public:
>    A(QObject *parent = 0) : QWidgetAction(parent){
>        QPushButton *b = new QPushButton("BUTTON");
>        setDefaultWidget(b);
> 
>        connect(b, SIGNAL(clicked()),
>                this, SLOT(trigger())); //Docs suggest executing this
>        connect(b, SIGNAL(clicked()),
>                this, SIGNAL(triggered()));
>    }
> }; 
> 
> 
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