/**************************************************************************** ** ** Copyright (C) 2016 The Qt Company Ltd. ** Contact: https://www.qt.io/licensing/ ** ** This file is part of the Qt Creator documentation. ** ** 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 The Qt Company. For licensing terms ** and conditions see https://www.qt.io/terms-conditions. For further ** information use the contact form at https://www.qt.io/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: https://www.gnu.org/licenses/fdl-1.3.html. ** ****************************************************************************/ // ********************************************************************** // NOTE: the sections are not ordered by their logical order to avoid // reshuffling the file each time the index order changes (i.e., often). // Run the fixnavi.pl script to adjust the links to the index order. // ********************************************************************** /*! \contentspage {Qt Creator Manual} \previouspage creator-debugging-example.html \page creator-qml-debugging-example.html \nextpage creator-troubleshooting-debugging.html \title Debugging a Qt Quick Example Application This section uses the \l{QML Advanced Tutorial}{Same Game} example application to illustrate how to debug Qt Quick applications in the \uicontrol Debug mode. For more information about all the options you have, see \l{Debugging Qt Quick Projects}. The Same Game demo shows how to write a game in QML, using JavaScript for all the game logic. Open the demo project in \QC to debug it: \list 1 \li To look at the code that starts a new game, place a breakpoint in samegame.qml by clicking between the line number and the window border on the line where where the \c startNewGame() function is called (1). \image qtquick-example-setting-breakpoint1.png The red circle indicates that a breakpoint is now set on that line number. \li Select \uicontrol {Debug > Start Debugging > Start Debugging} or press \key{F5}. \li Once the Same Game application starts, select \uicontrol {1 Player} to start a new game. \image samegame.png \li When the debugger hits the breakpoint, it interrupts the application. \QC displays the nested function calls leading to the current position as a call stack trace (1). \image qtquick-example-setting-breakpoint2.png \li Click the \inlineimage qtcreator-debug-button-step-into.png (\uicontrol {Step Into}) button on the toolbar or press \key F11 to step into the code in the stack. The samegame.js file opens in the code editor at the function that starts a new game. \image qtquick-example-stack.png \li Examine the local variables in the \uicontrol {Locals and Expressions} view. Step through the code to see how the information changes in the view. \li Add a breakpoint at the end of the \c {startNewGame()} function, and click \inlineimage qtcreator-debugging-continue.png (\uicontrol Continue) to hit the breakpoint. \image qtquick-example-setting-breakpoint3.png \li To execute JavaScript commands in the current context, open the \uicontrol {Debugger Console} output pane. \image qml-script-console.png \li To remove a breakpoint, right-click it and select \uicontrol {Delete Breakpoint}. \li Select the \uicontrol {Locals and Expressions} tab to explore the object structure at runtime: \image qtquick-example-qml-inspector.png \li Select \uicontrol Debug > \uicontrol {Show Application on Top} to keep the application visible while you interact with the debugger. \li Select \uicontrol Debug > \uicontrol Select to activate selection mode and then click the \uicontrol Menu button to move into the \uicontrol menuButton component in the \uicontrol {Locals and Expressions} view and the code editor. \li In the \uicontrol {Locals and Expressions} view, double-click the value of a property to change it. \endlist */