diff options
Diffstat (limited to 'doc/src/declarative/qdeclarativedebugging.qdoc')
| -rw-r--r-- | doc/src/declarative/qdeclarativedebugging.qdoc | 35 |
1 files changed, 33 insertions, 2 deletions
diff --git a/doc/src/declarative/qdeclarativedebugging.qdoc b/doc/src/declarative/qdeclarativedebugging.qdoc index b25576d498..ab64b9122a 100644 --- a/doc/src/declarative/qdeclarativedebugging.qdoc +++ b/doc/src/declarative/qdeclarativedebugging.qdoc @@ -2,7 +2,7 @@ ** ** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies). ** All rights reserved. -** Contact: Nokia Corporation (qt-info@nokia.com) +** Contact: http://www.qt-project.org/ ** ** This file is part of the documentation of the Qt Toolkit. ** @@ -34,7 +34,7 @@ \section2 Log -\c console.log, console.debug, console.warn and console.error can be used to print +\c console.log, console.debug, console.info, console.warn and console.error can be used to print debugging information to the console. For example: \qml @@ -49,6 +49,19 @@ The output is generated using the qDebug, qWarning, qCritical methods in C++ \hint 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. + +\qml +function f() { + var x = 12 + console.assert(x == 12, "This will pass"); + console.assert(x > 12, "This will fail"); +} +\endqml + \section2 Timer \c console.time and console.timeEnd log the time (in milliseconds) that was spent between @@ -71,6 +84,19 @@ function f() { 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, + +\qml +function f() { + console.count("f called"); +} +\endqml + +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 @@ -91,6 +117,11 @@ function f() { } \endqml +\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 Transitions When a transition doesn't look quite right, it can be helpful to view it in slow |