[Qt-qml] Starting an external program from QML?

[Kai Koehne]

On 10/25/2010 9:40 AM, ext Raymond de Vries wrote:
> Hi,
>
> On 10/25/2010 8:30 AM, Kai Koehne wrote:
>> On 10/25/2010 8:07 AM, ext Raymond de Vries wrote:
>>> Hi,
>>>
>>> That makes sense indeed, stupid of me. Could you point me at an example
>>> how to use the C++ slot from QML? I have been looking for this but I
>>> guess I am missing something...
>> There are actually multiple ways. One is to expose your slot to the QML
>> context, see
>>
>> http://doc.trolltech.com/4.7-snapshot/qtbinding.html#calling-c-methods-from-qml
>> .
> Ah, I understand. I had seen that page before but did not realize the
> use with standard widgets.
>> (The example shows you how to register a named object in the QML
>> context. If you don't like the objectName.slot() notation, you should
>> have a look at QDeclarativeContext::setContextObject(...)).
>>
>> Another way (and IMO better style) is to declare a signal in the QML
>> root element, and then connect it to the slot in the C++ part, e.g.
>> something like:
>>
>> x.qml:
>>
>> import QtQuick 1.0
>> Rectangle {
>>      signal startAppRequested
>>      // ...
>> }
>>
>> x.cpp:
>>
>> QDeclarativeView view;
>> // ...
>> view.show();
>> connect(view.rootObject(), SIGNAL(startAppRequested()), this,
>> SLOT(runApp());
> This looks good indeed, and it makes conversion from C++ UI to QML UI
> much easier. This helps a lot!
>
> Btw a little OT for here maybe but to be sure: I need to build Qt myself
> from git in order to use QtQuick like in your x.qml, right?

Right. The QtQuick 1.0 namespace will be introduced in 4.7.1 :

http://www.mail-archive.com/qt-qml@trolltech.com/msg01040.html

Just keep "import Qt 4.7" if you develop with 4.7.0.

Regards

Kai
-- 
Kai Koehne
Software Engineer
Nokia, Qt Development Frameworks

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