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Diffstat (limited to 'doc/src/declarative/binding.qdoc')
| -rw-r--r-- | doc/src/declarative/binding.qdoc | 51 |
1 files changed, 46 insertions, 5 deletions
diff --git a/doc/src/declarative/binding.qdoc b/doc/src/declarative/binding.qdoc index e6835ee..4f9bdc8 100644 --- a/doc/src/declarative/binding.qdoc +++ b/doc/src/declarative/binding.qdoc @@ -1,3 +1,44 @@ +/**************************************************************************** +** +** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies). +** Contact: Qt Software Information (qt-info@nokia.com) +** +** This file is part of the documentation of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL$ +** No Commercial Usage +** This file contains pre-release code and may not be distributed. +** You may use this file in accordance with the terms and conditions +** contained in the either Technology Preview License Agreement or the +** Beta Release License Agreement. +** +** GNU Lesser General Public License Usage +** Alternatively, this file may be used under the terms of the GNU Lesser +** General Public License version 2.1 as published by the Free Software +** Foundation and appearing in the file LICENSE.LGPL included in the +** packaging of this file. Please review the following information to +** ensure the GNU Lesser General Public License version 2.1 requirements +** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. +** +** In addition, as a special exception, Nokia gives you certain +** additional rights. These rights are described in the Nokia Qt LGPL +** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this +** package. +** +** GNU General Public License Usage +** Alternatively, this file may be used under the terms of the GNU +** General Public License version 3.0 as published by the Free Software +** Foundation and appearing in the file LICENSE.GPL included in the +** packaging of this file. Please review the following information to +** ensure the GNU General Public License version 3.0 requirements will be +** met: http://www.gnu.org/copyleft/gpl.html. +** +** If you are unsure which license is appropriate for your use, please +** contact the sales department at qt-sales@nokia.com. +** $QT_END_LICENSE$ +** +****************************************************************************/ + /*! \page binding.html \title Data Binding in QML @@ -5,17 +46,17 @@ Data binding provides a declarative way of specifying the data associated with objects, as well as the relationship between data of different objects. For example, you could bind the text of a label to the value of a slider: as the value of the slider changed, the label would be automatically updated with the new value. -Bindings are created in QML when an expression is assigned to a property. For example, the following produces two rectangles of equal size (\c Rect2 is bound to the size of \c Rect1): +Bindings are created in QML when an expression is assigned to a property. For example, the following produces two rectangles of equal size (\c rect2 is bound to the size of \c rect1): \code -Rectangle { id: Rect1; width: 100; height: 100 } -Rectangle { id: Rect2; width: Rect1.width; height: Rect1.height } +Rectangle { id: rect1; width: 100; height: 100 } +Rectangle { id: rect2; width: rect1.width; height: rect1.height } \endcode There is also a special \l Binding element, which is typically used to bind from the UI to the underlying UI model (see \l {Passing Data Between C++ and QML} for an example of this). The bindings above could be expressed using the \l Binding element as: \code -Binding { target: Rect2; property: "width"; value: Rect1.width } -Binding { target: Rect2; property: "height"; value: Rect1.height } +Binding { target: rect2; property: "width"; value: rect1.width } +Binding { target: rect2; property: "height"; value: rect1.height } \endcode In addition to binding directly to a property, you can also bind to the results of expressions involving properties. For example: |