IntentHandler QML Type

A handler for intent requests received by applications. More...

Import Statement: import QtApplicationManager.Application 2.0

Properties

Signals

Detailed Description

Any application that has intents listed in its manifest file needs to have a corresponding IntentHandler instance that is actually able to handle incoming requests. This class gives you the flexibility to handle multiple, different intent ids via a single IntentHandler instance or have a dedicated IntentHandler instance for every intent id (or any combination of those).

Note: For handling intent requests within the system ui, you have to use the derived component IntentServerHandler, which works the same way, but provides all the necessary meta-data from within QML.

Here is a fairly standard way to handle an incoming intent request and send out a result or error message:

Image {
    id: viewer
}

IntentHandler {
    intentIds: [ "show-image" ]
    onRequestReceived: {
        var url = request.parameters["url"]
        if (!url.startsWith("file://")) {
            request.sendErrorReply("Only file:// urls are supported")
        } else {
            viewer.source = url
            request.sendReply({ "status": source.status })
        }
    }
}

Property Documentation

intentIds : list<string>

Every handler needs to register at least one unique intent id that it will handle. Having multiple IntentHandlers that are registering the same intent id is not possible.

Note: Any changes to this property after component completion will have no effect.


Signal Documentation

requestReceived(request)

This signal will be emitted once for every incoming intent request that this handler was registered for via its intentIds property.

Handling the request can be done synchronously or asynchronously. As soon as your handler has either produced a result or detected an error condition, it should call IntentRequest::sendReply() or IntentRequest::sendErrorReply() respectively to send a reply back to the requesting party. Even if your intent does not have a return value, you still need to send an empty object {} reply to signal that the intent request has been handled successfully.

Only the first call to one of these functions will have any effect. Any further invocations will be ignored.

If these functions are not called after receiving an intent request within the system's specified timeout interval, the system will send an implicit "failed due to timeout" error reply back to the original sender.


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