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authorSimon Hausmann <simon.hausmann@digia.com>2013-06-24 11:26:22 +0200
committerSimon Hausmann <simon.hausmann@digia.com>2013-06-24 11:48:46 +0200
commit1a9759855639b9e2b3cdc0687d3381dcbf6c9815 (patch)
treeb2da51f6eddddb83c2d97cdcfac24d38d2e67a4e /src/quick/doc/src/appdevguide/debugging.qdoc
parent8217ec1b888f3ff93f004801b018c5f85362c484 (diff)
parente1fc2793aef53b84a3f1e19b6d6bdf1141340074 (diff)
Merge branch 'dev' of ssh://codereview.qt-project.org/qt/qtdeclarative into wip/v4
Conflicts: src/imports/qtquick2/plugins.qmltypes src/qml/debugger/qv8debugservice.cpp src/qml/qml/qml.pri src/qml/qml/qqmlcompiler.cpp src/qml/qml/qqmlcomponent.cpp src/qml/qml/qqmlcontext.cpp src/qml/qml/qqmldata_p.h src/qml/qml/qqmlengine_p.h src/qml/qml/qqmljavascriptexpression.cpp src/qml/qml/qqmlxmlhttprequest.cpp src/qml/qml/v4/qv4bindings.cpp src/qml/qml/v4/qv4irbuilder.cpp src/qml/qml/v4/qv4jsonobject_p.h src/qml/qml/v8/qqmlbuiltinfunctions.cpp src/qml/qml/v8/qv8bindings.cpp src/qml/qml/v8/qv8contextwrapper.cpp src/qml/qml/v8/qv8listwrapper.cpp src/qml/qml/v8/qv8qobjectwrapper.cpp src/qml/qml/v8/qv8qobjectwrapper_p.h src/qml/qml/v8/qv8sequencewrapper_p_p.h src/qml/qml/v8/qv8typewrapper.cpp src/qml/qml/v8/qv8valuetypewrapper.cpp src/qml/types/qqmldelegatemodel.cpp src/quick/items/context2d/qquickcanvasitem.cpp src/quick/items/context2d/qquickcontext2d.cpp sync.profile tests/auto/qml/qjsengine/tst_qjsengine.cpp tests/benchmarks/qml/animation/animation.pro tools/qmlprofiler/qmlprofiler.pro Change-Id: I18a76b8a81d87523247fa03a44ca334b1a2360c9
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-/****************************************************************************
-**
-** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
-** Contact: http://www.qt-project.org/legal
-**
-** This file is part of the documentation of the Qt Toolkit.
-**
-** $QT_BEGIN_LICENSE:FDL$
-** Commercial License Usage
-** Licensees holding valid commercial Qt licenses may use this file in
-** accordance with the commercial license agreement provided with the
-** Software or, alternatively, in accordance with the terms contained in
-** a written agreement between you and Digia. For licensing terms and
-** conditions see http://qt.digia.com/licensing. For further information
-** use the contact form at http://qt.digia.com/contact-us.
-**
-** GNU Free Documentation License Usage
-** Alternatively, this file may be used under the terms of the GNU Free
-** Documentation License version 1.3 as published by the Free Software
-** Foundation and appearing in the file included in the packaging of
-** this file. Please review the following information to ensure
-** the GNU Free Documentation License version 1.3 requirements
-** will be met: http://www.gnu.org/copyleft/fdl.html.
-** $QT_END_LICENSE$
-**
-****************************************************************************/
-
-/*!
-\page qtquick-debugging.html
-\ingroup qtquick-tools
-\title Debugging QML Applications
-\brief debugging tools in QML
-
-\section1 Console API
-
-\section2 Log
-
-\c console.log, console.debug, console.info, console.warn and console.error can be used to print
-debugging information to the console. For example:
-
-\code
-function f(a, b) {
- console.log("a is ", a, "b is ", b);
-}
-\endcode
-
-The output is generated using the qDebug, qWarning, qCritical methods in C++
-(see also http://doc.qt.nokia.com/latest/debug.html#warning-and-debugging-messages).
-
-Setting the environment variable QML_CONSOLE_EXTENDED also prints the source
-code location of the call.
-
-\section2 Assert
-
-\c console.assert tests that an expression is true. If not, it will write an optional message
-to the console and print the stack trace.
-
-\code
-function f() {
- var x = 12
- console.assert(x == 12, "This will pass");
- console.assert(x > 12, "This will fail");
-}
-\endcode
-
-\section2 Timer
-
-\c console.time and console.timeEnd log the time (in milliseconds) that was spent between
-the calls. Both take a string argument that identifies the measurement. For example:
-
-\code
-function f() {
- console.time("wholeFunction");
- console.time("firstPart");
- // first part
- console.timeEnd("firstPart");
- // second part
- console.timeEnd("wholeFunction");
-}
-\endcode
-
-\section2 Trace
-
-\c console.trace prints the stack trace of JavaScript execution at the point where
-it was called. The stack trace info contains function name, file name, line number
-and column number. The stack trace is limited to last 10 stack frames.
-
-\section2 Count
-
-\c console.count prints the current number of times a particular piece of code has been executed,
-along with a message. That is,
-
-\code
-function f() {
- console.count("f called");
-}
-\endcode
-
-will print \c{f called: 1}, \c{f called: 2} ... whenever \c{f()} is executed.
-
-\section2 Profile
-
-\c console.profile turns on the QML and JavaScript profilers. Nested calls are not
-supported and a warning will be printed to the console.
-
-\c console.profileEnd turns off the QML and JavaScript profilers. Calling this function
-without a previous call to console.profile will print a warning to the console. A
-profiling client should have been attached before this call to receive and store the
-profiling data. For example:
-
-\code
-function f() {
- console.profile();
- //Call some function that needs to be profiled.
- //Ensure that a client is attached before ending
- //the profiling session.
- console.profileEnd();
-}
-\endcode
-
-\section2 Exception
-
-\c console.exception prints an error message together with the stack trace of JavaScript
-execution at the point where it is called.
-
-\section1 Debugging module imports
-
-The \c QML_IMPORT_TRACE environment variable can be set to enable debug output
-from QML's import loading mechanisms.
-
-For example, for a simple QML file like this:
-
-\qml
-import QtQuick 2.0
-
-Rectangle { width: 100; height: 100 }
-\endqml
-
-If you set \c {QML_IMPORT_TRACE=1} before running the \l{qtquick-qmlscene.html}
-{QML Scene} (or your QML C++ application), you will see output similar to this:
-
-\code
-QQmlImportDatabase::addImportPath "/qt-sdk/imports"
-QQmlImportDatabase::addImportPath "/qt-sdk/bin/QMLViewer.app/Contents/MacOS"
-QQmlImportDatabase::addToImport 0x106237370 "." -1.-1 File as ""
-QQmlImportDatabase::addToImport 0x106237370 "Qt" 4.7 Library as ""
-QQmlImportDatabase::resolveType "Rectangle" = "QDeclarativeRectangle"
-\endcode
-
-
-\section1 Debugging with Qt Creator
-
-\l{http://qt.nokia.com/products/developer-tools}{Qt Creator} provides built-in
-support for QML debugging. QML projects and standalone C++ applications that
-utilize QML can be debugged on desktops as well as on remote devices.
-For more information, see the Qt Creator Manual.
-
-*/