How to toggle WindowCloseButton Hint off and on

[AaronKelsey]

I am wanting to disable the close window button on a QDialog until a process has finished, I want to disable and enable the button using a boolean as a toggle.

I have written this function but unfortunately I am having no luck. I saw that when I change the window flags it it calls setParent which hides the dialog, but when using show() to reshow the dialog once hidden the application stops responding and I cannot work out what I have done wrong.

void NodeLogDialog::enableButtons(bool bEnabled)
{
	ui->btnOK->setEnabled(bEnabled);
	ui->btnSave->setEnabled(bEnabled);

	Qt::WindowFlags flags = this->windowFlags();

	if (bEnabled)
	{
		setWindowFlags(windowFlags() | (Qt::WindowContextHelpButtonHint) | (Qt::WindowCloseButtonHint));
	}
	else
	{
		setWindowFlags(windowFlags() & (~Qt::WindowContextHelpButtonHint) & (~Qt::WindowCloseButtonHint));
	}

	show();
}

Thank you in advance

[SGaist]

Hi,

What version of Qt are you using ?
What OS are you running ?
When/How is that method called in your application ?

[AaronKelsey]

@SGaist

Hey,

I am using QT 5.1.0 and I am running Windows 10 Enterprise.

I create a node dialog object and then call exec from my main window class.

NodeLogDialog oNodeLogDialog(moSuppMgrHubAddress,
                                    oSelectedNodes,
                                    this);

oNodeLogDialog.exec();

The code below is a function within NodeLogDialog.

void NodeLogDialog::enableButtons(bool bEnabled)
{
	ui->btnOK->setEnabled(bEnabled);
	ui->btnSave->setEnabled(bEnabled);

	Qt::WindowFlags flags = this->windowFlags();

	if (bEnabled)
	{
		setWindowFlags(windowFlags() | (Qt::WindowContextHelpButtonHint) | (Qt::WindowCloseButtonHint));
	}
	else
	{
		setWindowFlags(windowFlags() & (~Qt::WindowContextHelpButtonHint) & (~Qt::WindowCloseButtonHint));
	}

	show();
}

[jsulm]

@AaronKelsey said in How to toggle WindowCloseButton Hint off and on:

void NodeLogDialog::enableButtons(bool bEnabled)

Where do you call it?
Keep in mind that exec() is a blocking call, so you need to call that method before exec().

[AaronKelsey]

@jsulm I call this function twice after I call exec(). If exec is a blocking call what method can I use to get around this? Whilst the dialog is open using exec I need to disable and enable the buttons.

[jsulm]

@AaronKelsey Initially you can call it just before exec().
Afterwards you can use signals/slots to let the dialog know that you want to enable/disable buttons.
But I'm wondering what the trigger is (or who calls it then) after exec() as that one is blocking?

[AaronKelsey]

@jsulm I am not sure whether I have fully understood your question but the toggle for enabling/disabling the dialog close button is handled and called within the dialog class.