Derek Fountain wrote:
>> If you have a signal in your model:
>>
>> QSignal0 modelChanged
>>
>> and you connect
>>
>> modelChanged.connect(view, "update()");
>>
>> then when you do:
>>
>> // update model in model thread
>> modelChanged.emit();
>>
>> update() will be called on the view in the GUI thread. This is a queued
>> connection. Actually it is an auto connection which decides to do the
>> operation queued at run time because the emitter and receiver are in
>> different threads.
>>
>> The connect statement can be performed from any thread.
>
> OK, I think I understand this now. :) But it's still not working.
> Firstly, is there a QSignal0 class? I've used QSignalEmitter.Signal0. Is
> that what you meant, or have I missed something else? :)
Sorry, I meant QSignalEmitter.Signal0 ;)
> More importantly, I've used something similar to the code above, and
> still get an exception. Inside my view class, which extends QWidget,
> I've created a field called updateSignal which is a Signal0. From inside
> my view class constructor I make the queued connection explicitly like this:
>
> this.updateSignal.connect(this, "update()",
> Qt.ConnectionType.QueuedConnection);
>
> and from the thread started by the model's Timer, I do the emit like this:
>
> this.updateSignal.emit();
It makes more sense if the signal lives in the model thread:
import com.trolltech.qt.core.*;
import com.trolltech.qt.gui.*;
import com.trolltech.qt.*;
public class QueuedConnection {
private static class WorkerThread extends QSignalEmitter implements
Runnable {
public Signal1<Integer> timeout = new Signal1<Integer>();
public WorkerThread() {
new Thread(this).start();
}
public void run() {
long startTime = System.currentTimeMillis();
while (1 + 1 == 2) {
try { Thread.currentThread().sleep(1000); } catch
(Exception e) { }
timeout.emit((int) (System.currentTimeMillis() -
startTime));
}
}
}
public static void main(String args[]) {
QApplication.initialize(args);
WorkerThread thread = new WorkerThread();
QLabel label = new QLabel();
thread.timeout.connect(label, "setNum(int)");
label.show();
QApplication.exec();
}
}
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