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authorQt by Nokia <qt-info@nokia.com>2011-04-27 12:05:43 +0200
committeraxis <qt-info@nokia.com>2011-04-27 12:05:43 +0200
commit885735d011472bcfbb96e688d9e64553d7fe9d4b (patch)
tree734963625eba643bf11bc4870a4c407809a6400a /doc/src/snippets/declarative/properties.qml
Initial import from the monolithic Qt.
This is the beginning of revision history for this module. If you want to look at revision history older than this, please refer to the Qt Git wiki for how to use Git history grafting. At the time of writing, this wiki is located here: http://qt.gitorious.org/qt/pages/GitIntroductionWithQt If you have already performed the grafting and you don't see any history beyond this commit, try running "git log" with the "--follow" argument. Branched from the monolithic repo, Qt master branch, at commit 896db169ea224deb96c59ce8af800d019de63f12
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+/****************************************************************************
+**
+** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the documentation of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:BSD$
+** You may use this file under the terms of the BSD license as follows:
+**
+** "Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are
+** met:
+** * Redistributions of source code must retain the above copyright
+** notice, this list of conditions and the following disclaimer.
+** * Redistributions in binary form must reproduce the above copyright
+** notice, this list of conditions and the following disclaimer in
+** the documentation and/or other materials provided with the
+** distribution.
+** * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor
+** the names of its contributors may be used to endorse or promote
+** products derived from this software without specific prior written
+** permission.
+**
+** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+//! [document]
+import QtQuick 1.0
+
+//! [parent begin]
+Rectangle {
+//! [parent begin]
+
+ //! [inherited properties]
+ width: 320; height: 240
+ color: "lightblue"
+ focus: true
+ //! [inherited properties]
+
+ //! [custom properties]
+ property int counter
+ property real area: 100.45
+ //! [custom properties]
+
+ //! [property types]
+ property int number
+ property real volume: 100.45
+ property date today: "2011-01-01"
+ property color background: "yellow"
+ //! [property types]
+
+
+//! [grouped properties]
+Text {
+ //dot notation
+ font.pixelSize: 12
+ font.bold: true
+}
+
+Text {
+ //group notation
+ font {pixelSize: 12; bold: true}
+}
+//! [grouped properties]
+
+
+//! [property binding]
+Rectangle {
+ width: parent.width
+}
+//! [property binding]
+
+//! [property assignment]
+Rectangle {
+ Component.onCompleted: {
+ width = 150
+ }
+}
+//! [property assignment]
+
+Rectangle {
+ //placeholder slider
+ id: slider
+ property real value
+}
+Rectangle {
+ //placeholder system
+ id: system
+ property real brightness
+}
+//! [binding element]
+Binding {
+ target: system
+ property: "brightness"
+ value: slider.value
+}
+//! [binding element]
+
+Rectangle {
+ //placeholder warning
+ id: warning
+ color: "red"
+}
+//! [PropertyChanges element]
+Rectangle {
+ id: rectangle
+
+ states: State {
+ name: "WARNING"
+ PropertyChanges {
+ target: rectangle
+ color: warning.color
+ }
+ }
+}
+//! [PropertyChanges element]
+
+//! [list property]
+Item {
+ id: multistate
+ states: [
+ State {name: "FETCH"},
+ State {name: "DECODE"},
+ State {name: "EXECUTE"}
+ ]
+}
+//! [list property]
+//! [single property]
+Item {
+ id: monostate
+ states: State {name: "RUNNING"}
+}
+//! [single property]
+
+Item {
+ id: printstate
+//! [print list property]
+ Component.onCompleted: console.log (multistate.states[0].name)
+//! [print list property]
+}
+
+//! [JavaScript sample]
+function calculateArea(width, height) {
+ return (width * height) * 0.5
+}
+
+Rectangle {
+ width: 150; height: 75
+ property real area: calculateArea(width, height)
+ property real parentArea: calculateArea(parent.width,parent.height)
+ color: { if (area > parentArea) "blue"; else "red" }
+}
+//! [JavaScript sample]
+
+//! [id property]
+Rectangle {
+ id: container
+ width: 100; height: 100
+ Rectangle {
+ width: parent.width; height: parent.height
+ }
+}
+Rectangle {
+ width: container.width; height: container.height
+}
+//! [id property]
+
+//! [default property]
+Item {
+ Text {}
+ Rectangle {}
+ Timer {}
+}
+
+Item {
+ //without default property
+ children: [
+ Text {},
+ Rectangle {}
+ ]
+ resources: [
+ Timer {}
+ ]
+}
+//! [default property]
+
+//! [state default]
+State {
+ changes: [
+ PropertyChanges {},
+ PropertyChanges {}
+ ]
+}
+
+State {
+ PropertyChanges {}
+ PropertyChanges {}
+}
+//! [state default]
+
+//! [object binding]
+Rectangle {
+
+ id: parentrectangle
+ gradient:
+ Gradient { //not a child of parentrectangle
+
+ //generates a TypeError
+ //Component.onCompleted: console.log(parent.width)
+ }
+
+ //child of parentrectangle
+ Rectangle {property string name: "childrectangle"}
+
+ //prints "childrectangle"
+ Component.onCompleted: console.log(children[0].name)
+}
+//! [object binding]
+
+//! [list attached property]
+Component {
+ id: listdelegate
+ Text {
+ text: "Hello"
+ color: ListView.isCurrentItem ? "red" : "blue"
+ }
+}
+ListView {
+ delegate: listdelegate
+}
+//! [list attached property]
+
+//! [attached signal handler]
+Item {
+ Keys.onPressed: console.log("Key Press Detected")
+ Component.onCompleted: console.log("Completed initialization")
+}
+//! [attached signal handler]
+
+//! [alias usage]
+Button {
+ id: textbutton
+ buttonLabel: "Click Me!"
+}
+//! [alias usage]
+
+//! [image alias]
+Button {
+ id: imagebutton
+ buttonImage.source: "http://qt.nokia.com/logo.png"
+ buttonLabel: buttonImage.source
+}
+//! [image alias]
+
+Item {
+id: widget
+
+//! [alias complete]
+property alias widgetLabel: label
+
+//will generate an error
+//widgetLabel.text: "Initial text"
+
+//will generate an error
+//property alias widgetLabelText: widgetLabel.text
+
+Component.onCompleted: widgetLabel.text = "Alias completed Initialization"
+//! [alias complete]
+
+ Text {id: label}
+}
+
+//![alias overwrite]
+Rectangle {
+ id: coloredrectangle
+ property alias color: bluerectangle.color
+ color: "red"
+
+ Rectangle {
+ id: bluerectangle
+ color: "#1234ff"
+ }
+
+ Component.onCompleted: {
+ console.log (coloredrectangle.color) //prints "#1234ff"
+ setInternalColor()
+ console.log (coloredrectangle.color) //prints "#111111"
+ coloredrectangle.color = "#884646"
+ console.log (coloredrectangle.color) //prints #884646
+ }
+
+ //internal function that has access to internal properties
+ function setInternalColor() {
+ color = "#111111"
+ }
+}
+//![alias overwrite]
+//! [parent end]
+}
+//! [parent end]
+//! [document]