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39
40#include "qdebugmessageservice.h"
41
42#include <private/qqmldebugconnector_p.h>
43#include <private/qversionedpacket_p.h>
44
45QT_BEGIN_NAMESPACE
46
47using QQmlDebugPacket = QVersionedPacket<QQmlDebugConnector>;
48
49void DebugMessageHandler(QtMsgType type, const QMessageLogContext &ctxt,
50 const QString &buf)
51{
52 QQmlDebugConnector::service<QDebugMessageServiceImpl>()->sendDebugMessage(type, ctxt, buf);
53}
54
55QDebugMessageServiceImpl::QDebugMessageServiceImpl(QObject *parent) :
56 QDebugMessageService(2, parent), oldMsgHandler(nullptr),
57 prevState(QQmlDebugService::NotConnected)
58{
59 // don't execute stateChanged() in parallel
60 QMutexLocker lock(&initMutex);
61 timer.start();
62 if (state() == Enabled) {
63 oldMsgHandler = qInstallMessageHandler(DebugMessageHandler);
64 prevState = Enabled;
65 }
66}
67
68void QDebugMessageServiceImpl::sendDebugMessage(QtMsgType type,
69 const QMessageLogContext &ctxt,
70 const QString &buf)
71{
72 //We do not want to alter the message handling mechanism
73 //We just eavesdrop and forward the messages to a port
74 //only if a client is connected to it.
75 QQmlDebugPacket ws;
76 ws << QByteArray("MESSAGE") << int(type) << buf.toUtf8();
77 ws << QByteArray(ctxt.file) << ctxt.line << QByteArray(ctxt.function);
78 ws << QByteArray(ctxt.category) << timer.nsecsElapsed();
79
80 emit messageToClient(name: name(), message: ws.data());
81 if (oldMsgHandler)
82 (*oldMsgHandler)(type, ctxt, buf);
83}
84
85void QDebugMessageServiceImpl::stateChanged(State state)
86{
87 QMutexLocker lock(&initMutex);
88
89 if (state != Enabled && prevState == Enabled) {
90 QtMessageHandler handler = qInstallMessageHandler(oldMsgHandler);
91 // has our handler been overwritten in between?
92 if (handler != DebugMessageHandler)
93 qInstallMessageHandler(handler);
94
95 } else if (state == Enabled && prevState != Enabled) {
96 oldMsgHandler = qInstallMessageHandler(DebugMessageHandler);
97 }
98
99 prevState = state;
100}
101
102void QDebugMessageServiceImpl::synchronizeTime(const QElapsedTimer &otherTimer)
103{
104 QMutexLocker lock(&initMutex);
105 timer = otherTimer;
106}
107
108QT_END_NAMESPACE
109

source code of qtdeclarative/src/plugins/qmltooling/qmldbg_messages/qdebugmessageservice.cpp