Cascades Development

[laurentC]

Hello,

I'm trying to implement a basic yes/no confirmation dialog.
I would use SystemDialog https://developer.blackberry.com/cascades/reference/bb__system__systemdialog.html but I need an example.
Can you help ?

Thanks,
Laurent

[smacmartin]

If invoking from C++:

1. Add to the project file (.pro):
   LIBS += -lbbsystem
   
   
   
2. Near top of C++ cpp file:
   #include <bb/system/SystemDialog>
   
   
3. To bring up a dialog:
   bb::system:ystemDialog* menu = new bb::system:ystemDialog("ok", "cancel");
   menu->setTitle("My title");
   menu->setBody("This is the body");
   menu->show();
   
   
4. Hook up the accepted and rejected signals
   I am not fluent in the meaning of "dismissAutomatically".  So for now I'd say be sure to call deleteLater here.

Stuart

[laurentC]

Oops sorry I would like a qml example...

[amarcon]

Perhaps, you could use CustomDialog.

https://developer.blackberry.com/cascades/reference/bb__cascades__customdialog.html

Under the QML side, you will need to make it visible somehow, such as:

                Button {
	            text: "Pop"
	            layoutProperties: StackLayoutProperties {
	                horizontalAlignment: HorizontalAlignment.Center
	            }
	            onClicked: {
	                myCustomDialog.visible = true
	            }
	        }

 and then handle the events, such as:

attachedObjects: [
	CustomDialog {
	   id: myCustomDialog
	   content: Container {
	      Button {
	          text: "Yes"
	          onClicked: myCustomDialog.visible = false
	      }
	      Button {
   	          text: "No"
   	          onClicked: myCustomDialog.visible = false
   	       }
	   }
	}
]

Hope this helps.

[laurentC]

Yes this helps. I'll give it a try.
Thank you.

[amarcon]

That's great, let me know the results.

Cheers,

[jamiejulius]

Following smacmartin's helpful reply, I have found that deriving a class from SystemDialog can be helpful. Use SystemDialogEx instead of SystemDialog and use showEx instead of show and you will have a self-deleting SystemDialog.

Of course, for those cases where you need to know how the dialog was dismissed, you can connect additional slots to the accepted and rejected signals.

Code:

SystemDialogEx::SystemDialogEx(QObject* parent)
: SystemDialog(parent)
{
}

SystemDialogEx::SystemDialogEx(const QString& confirmLabel, QObject* parent)
: SystemDialog(confirmLabel, parent)
{
}

SystemDialogEx::SystemDialogEx(const QString& confirmLabel, const QString& cancelLabel, QObject* parent)
: SystemDialog(confirmLabel, cancelLabel, parent)
{
}

SystemDialogEx::~SystemDialogEx()
{
}

void SystemDialogEx::showEx()
{
	QObject::connect(this, SIGNAL(accepted()), this, SLOT(onDismissed()));
	QObject::connect(this, SIGNAL(rejected()), this, SLOT(onDismissed()));
	QObject::connect(this, SIGNAL(error(bb::system::SystemUiErrors::Type)), this, SLOT(onError(bb::system::SystemUiErrors::Type)));

	show();
}

void SystemDialogEx::onDismissed()
{
	deleteLater();
}

void SystemDialogEx::onError(bb::system::SystemUiErrors::Type err)
{
	deleteLater();
}

Jamie

[MFSI]

Hi smacmartin,

I am also trying to display a dialog, followed steps you wrote for dialog creation.

in my App() constructor , I have written the following code.

Container *mContainer = root->findChild<Container*>("myContainer");
    bb::system::SystemDialog *mSysDialog = new bb::system::SystemDialog("ok",
            "cancel", mContainer);
    mSysDialog->setTitle("Dialog");
    mSysDialog->setBody("hello hello hello hello");
    mSysDialog->show();

but on application execution dialog doesnot appear.

For simply creating a and displaying a dialog what else is required ?

Same  problem occurs when I am using SystemToast class.

[amarcon]

Hi MFSI,

I've made some quick tests here, you can try something like the samples below, m_mainPage comes from:

// The application Page is created from QML.
m_mainPage = qml->createRootNode<Page>();

app.cpp

mSysDialog = new bb::system::SystemDialog("ok","cancel", m_mainPage);
mSysDialog->setTitle("Dialog");
mSysDialog->setBody("hello hello hello hello");

mSysToast = new bb::system::SystemToast(m_mainPage);

still on app.cpp

void App::onButton1Clicked(){
    mSysDialog->show();
}

void App::onButton2Clicked(){
    mSysToast->show();
}

 app.hpp

bb::system::SystemDialog* mSysDialog;
bb::system::SystemToast* mSysToast;

Hope this helps.

 Cheers,

[MFSI]

Thanks amarcon, for your reply.

But I want to clear one issue.

Is it necessary to connect dialog or toast with some other control and on emission of any signal from that control will invoke a slot that contains dialog's or toast's show() method ?

Can't we invoke show()  method just after its(dialog's or toast's) initialization the way I did in my previous.

Also it wont affect whether a Page or a Container object acts as parent for dialog and toast . It will work for both.

Actually problem in my case was that  I wasn't connecting Dialog or Toast with any other control.