[Qt-qml] Best way to update QML display based on external input via TCP socket?

[aaron.kennedy at nokia.com]

Hi,

Yes, the QObject documentation is out of date.  I've fixed it, but it will take a while to make its way to the public website.

Cheers,

Aaron


On 16/04/10 6:58 AM, "ext John Vilburn" <john at ohanasoftware.com> wrote:

My mistake. NOTIFY is listed in the Q_PROPERTY documentation in 4.6, but not consistently.

In the QObject Class Reference, Q_PROPERTY is listed like this:

Q_PROPERTY(type name
            READ getFunction
            [WRITE setFunction]
            [RESET resetFunction]
            [DESIGNABLE bool]
            [SCRIPTABLE bool]
            [STORED bool]
            [USER bool])
But on the Qt's Property System page it is listed like this:

Q_PROPERTY(type name
            READ getFunction
            [WRITE setFunction]
            [RESET resetFunction]
            [NOTIFY notifySignal]
            [DESIGNABLE bool]
            [SCRIPTABLE bool]
            [STORED bool]
            [USER bool]
            [CONSTANT]
            [FINAL])
Is this just a case of the QObject Class Reference being out of date, or is there another reason for the discrepancy?

Thank you,
John

On Apr 15, 2010, at 10:48 AM, John Vilburn wrote:

Matthias,

The documentation for Qt 4.6.2 does not mention a NOTIFY section for Q_PROPERTY. Is this new to 4.7?

Thanks,
John

On Apr 15, 2010, at 10:37 AM, <matthias.ettrich at nokia.com> <matthias.ettrich at nokia.com> wrote:


The dynamic parts of the UI should be build entirely based  on properties provided by the CodeBehind. If those properties are notifyable (i.e. the Q_PROPERTY macro contains a NOTIFY section), then the UI will update itself.

A less pretty and less declarative way would be to emit a signal from CodeBehind, and then have a signal handler in QML react to it imperatively. But that would be old school. QML's property bindings are waaaaay more elegant.

Matthias
________________________________________
From: qt-qml-bounces at trolltech.com [qt-qml-bounces at trolltech.com] On Behalf Of ext Peter Matuchniak [pmatuchniak at imsco-us.com]
Sent: Thursday, April 15, 2010 8:37 PM
To: qt-qml at trolltech.com
Subject: [Qt-qml] Best way to update QML display based on external input via TCP socket?

Hello

I have a Qt main application that does the following (with my descriptions in parentheses):

-          Displays a QML user interface (the "UI")

-          Handles user events in a C++ class (the "CodeBehind")

-          Listens on a TCP socket for external input (the "Listener")

Here's my question:

-          What is the best way for the Listener to cause some update in the UI to occur when the Listener receives some external command via TCP

Note:

-          I already have the Listener functioning and receiving commands

-          I already have the CodeBehind acting upon input from the UI

-          What I need is to have a way to affect the UI from the Listener

Kind regards
Peter



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