/**************************************************************************** ** ** This file is part of Qt Creator ** ** Copyright (c) 2011 Nokia Corporation and/or its subsidiary(-ies). ** ** Contact: Nokia Corporation (qt-info@nokia.com) ** ** ** GNU Free Documentation License ** ** 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. ** ** If you have questions regarding the use of this file, please contact ** Nokia at qt-info@nokia.com. ** ****************************************************************************/ // ********************************************************************** // 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 index.html \previouspage creator-build-example-application.html \page creator-qml-application.html \nextpage creator-qml-components-example.html \title Creating a Qt Quick Application \note To complete this tutorial, you must have Qt 4.7 or later installed. This tutorial uses basic elements and illustrates basic concepts of \l {http://doc.qt.nokia.com/4.7/qtquick.html}{Qt Quick}. This tutorial describes how to use the \QC to implement the \l{http://doc.qt.nokia.com/4.7/declarative-animation-states.html} {states and transitions example application}. The example application displays a Qt logo that moves between three rectangles on the page when you click them. \image qmldesigner-tutorial.png "States and transitions example" For more information about using \QMLD, see \l{Developing Qt Quick Applications}. \section1 Creating the Project \list 1 \o Select \gui{File > New File or Project > Qt Quick Project > Qt Quick Application > Choose}. \o In the \gui{Name} field, type \bold {Transitions}. \o In the \gui {Create in} field, enter the path for the project files. For example, \c {C:\Qt\examples}, and then click \gui{Next}. \o In the \gui {Application Type} dialog, select \gui {Built-in elements only (for all platforms)}, and then click \gui{Next}. \o Select targets, and then click \gui{Next}. \note Targets are listed if you installed the appropriate development environment, for example, as part of the \QSDK. You can add targets later in the \gui Projects mode. \o Select \gui Next in the following dialogs to use the default settings. \o Review the project settings, and click \gui{Finish} to create the project. \o Press \key {Ctrl+R} to run the application. \endlist \QC generates a default QML file that you can modify to create the main view of the application. \image qmldesigner-tutorial-project.png "Transitions project in Edit mode" \section1 Creating the Main View The main view of the application displays a Qt logo in the top left corner of the screen and two empty rectangles. To use the states.png image in your application, you must copy it to the project directory (same subdirectory as the QML file) from the examples directory in the Qt installation directory. For example: \c {C:\QtSDK\Examples\4.7\declarative\animation\states}. The image appears in the \gui Resources pane. You can also use any other image or a QML element, instead. \list 1 \o In the \gui Projects view, double-click the main.qml file to open it in the code editor. \o Click \gui Design to open the file in \QMLD. \image qmldesigner-tutorial-desing-mode.png "Transitions project in Design Mode" \o In the \gui Navigator pane, select \gui Text and press \key Delete to delete it. \o Select \gui Rectangle to edit its properties. \image qmldesigner-tutorial-page.png "Page properties" \list a \o In the \gui Id field, enter \e page, to be able to reference the rectangle from other places. \o In the \gui Colors group, \gui Rectangle field, set the color to #343434. \endlist \o In the \gui Library view, \gui Resources tab, select states.png and drag and drop it to the canvas. \image qmldesigner-tutorial-user-icon.png "Image properties" \list a \o In the \gui Id field, enter \e icon. \o In the \gui Position field, set \gui X to 10 and \gui Y to 20. \endlist \o In the \gui Library view, \gui Items tab, select \gui Rectangle, drag and drop it to the canvas, and edit its properties. \image qmldesigner-tutorial-topleftrect.png "Rectangle properties" \list a \o In the \gui Id field, enter \e topLeftRect. \o In the \gui Size field, set \gui W and \gui H to 64, for the rectangle size to match the image size. \o In the \gui Colors group, \gui Rectangle field, click the \inlineimage qmldesigner-transparent-button.png button to make the rectangle transparent. \o In the \gui Border field, set the border color to #808080. \o In the \gui Rectangle group, \gui Border field, set the border width to 1. \note If the \gui Border field does not appear after you set the border color, try setting the border color to solid by clicking the \inlineimage qmldesigner-solid-color-button.png button. \o In the \gui Radius field, select 6 to create rounded corners for the rectangle. \o Click \gui {Layout}, and then click the top and left anchor buttons to anchor the rectangle to the top left corner of the page. \image qmldesigner-tutorial-topleftrect-layout.png "Layout tab" \o In the \gui Margin field, select 20 for the top anchor and 10 for the left anchor. \endlist \o In the \gui Navigator pane, drag and drop the \gui {Mouse Area} element from \e page to \e topLeftRect to make it apply only to the rectangle and not to the whole page. \o Edit \gui {Mouse Area} properties: \list a \o Click \gui {Layout}, and then click the \inlineimage qmldesigner-anchor-fill-screen.png button to anchor the mouse area to the rectangle. \o In the code editor, edit the pointer to the clicked expression in the mouse area element, as illustrated by the following code snippet: \qml MouseArea { anchors.fill: parent onClicked: page.state = '' } \endqml The expression sets the state to the base state and returns the image to its initial position. \endlist \o In the \gui Navigator pane, copy topLeftRect (by pressing \key {Ctrl+C}) and paste it to the canvas twice (by pressing \key {Ctrl+V}). \QC renames the new instances of the element topLeftRect1 and topLeftRect2. \o Select topLeftRect1 and edit its properties: \list a \o In the \gui Id field, enter \e middleRightRect. \o In \gui {Layout}, select the vertical center anchor button and then the right anchor button to anchor the rectangle to the middle right margin of the screen. \o In the \gui Margin field, select 10 for the right anchor and 0 for the vertical center anchor. \o In the code editor,add a pointer to a clicked expression to the mouse area element. The following expression sets the state to \e State1: \c {onClicked: page.state = 'State1'} You will create State1 later. \endlist \o Select topLeftRect2 and edit its properties: \list a \o In the \gui Id field, enter \e bottomLeftRect. \o In \gui {Layout}, select the bottom and left anchor buttons to anchor the rectangle to the bottom left margin of the screen. \o In the \gui Margin field, select 20 for the bottom anchor and 10 for the left anchor. \o In the code editor, add a pointer to a clicked expression to the mouse area element. The following expression sets the state to \e State2: \c {onClicked: page.state = 'State2'} You will create State2 later. \endlist \o Press \key {Ctrl+S} to save the changes. \o Press \key {Ctrl+R} to run the application. \endlist \image qmldesigner-tutorial.png "States and transitions example" You should see the Qt logo in the top left rectangle, and two additional rectangles in the center right and bottom left of the screen. You can now create additional states to add views to the application. \section1 Adding Views In the .qml file, you already created pointers to two additional states: State1 and State2. To create the states: \list 1 \o Click the empty slot in the \gui States pane to create State1. \o Click the empty slot in the \gui States pane to create State2. \o In the code editor, bind the position of the Qt logo to the rectangle to make sure that the logo is displayed within the rectangle when the view is scaled on different sizes of screens. Set expressions for the x and y properties, as illustrated by the following code snippet: \snippet snippets/qml/states-properties.qml states \image qmldesigner-tutorial-state1.png "States" \note When you set the expressions, drag and drop is disabled for the icon in \QMLD. \o Press \key {Ctrl+R} to run the application. \endlist Click the rectangles to move the Qt logo from one rectangle to another. \section1 Adding Animation to the View Add transitions to define how the properties change when the Qt logo moves between states. The transitions apply animations to the Qt logo. For example, the Qt logo bounces back when it moves to the middleRightRect and eases into bottomLeftRect. Add the transitions in the code editor. \list 1 \o In the code editor, add the following code to specify that when moving to State1, the x and y coordinates of the Qt logo change linearly over a duration of 1 second: \snippet snippets/qml/list-of-transitions.qml first transition \o You can use the Qt Quick toolbar for animation to change the easing curve type from linear to OutBounce: \list a \o Click \gui NumberAnimation in the code editor to display the \inlineimage qml-toolbar-indicator.png icon, and then click the icon to open the toolbar: \image qmldesigner-tutorial-quick-toolbar.png "Qt Quick toolbar for animation" \o In the \gui Easing field, select \gui Bounce. \o In the \gui Subtype field, select \gui Out. \endlist \o Add the following code to specify that when moving to State2, the x and y coordinates of the Qt logo change over a duration of 2 seconds, and an InOutQuad easing function is used: \snippet snippets/qml/list-of-transitions.qml second transition \o Add the following code to specify that for any other state changes, the x and y coordinates of the Qt logo change linearly over a duration of 200 milliseconds: \snippet snippets/qml/list-of-transitions.qml default transition \o Press \key {Ctrl+R} to run the application. \endlist Click the rectangles to view the animated transitions. */