How to detect Dialog.Discard

[Tom_H]

Hello. I have a QuickControls2 Dialog where I have defined standardButtons: Dialog.Save | Dialog.Discard . How do I detect when the Discard button is clicked? It does not close the dialog or emit a rejected signal. It does nothing. The documentation says it has the mysterious DestructiveRole, but doesn't explain how to use it. Thanks.

Dialog {
    id: savdlg
    standardButtons: Dialog.Save | Dialog.Discard
    // ...

    Component.onCompleted: {
        console.log('savdlg completed')
    }

    Component.onDestruction: {
        console.log('savdlg destruction')
    }

    onAccepted: {
        console.log('savdlg: accepted')
    }

    onRejected: {
        console.log('savdlg: rejected')
    }

    Text {
        text: 'Save changes?'
    }
}

[Tom_H]

bump .

[dheerendra]

what is bump here ?

Have you tried onDiscard signal ?

[Tom_H]

@dheerendra Bump gets the topic back to the top.

Ah, I should have specified I was using Qt 5.9. There is a Discard button and a DestructiveRole but no discarded signal. I see they added it in 5.10. Thanks.

[GrecKo]

You could use the fact that the footer of a Dialog is a DialogButtonBox by default and add this to your dialog:

    signal discarded()
    Connections {
        target: dialog.footer
        onClicked: {
            if (button.DialogButtonBox.buttonRole) {
                dialog.discarded();
                dialog.close();
            }
        }
    }

[Tom_H]

@GrecKo Thank you! That worked. I could have also used a Cancel button and changed the text to 'Discard', but I did something else instead. I now want both a Cancel and Discard button, but don't like the default role for Cancel, so I made my own custom DialogButtonBox for the footer.

Glad I bumped :)