Docs - clarify use of PropertyChanges for immediate property changes in

a State (e.g. for setting a transformOrigin for a RotationAnimation).
Also improve some other animation docs in general.

3 files changed, 106 insertions, 8 deletions

diff --git a/doc/src/declarative/animation.qdoc b/doc/src/declarative/animation.qdoc
index 7416341..53a0c55 100644
--- a/doc/src/declarative/animation.qdoc
+++ b/doc/src/declarative/animation.qdoc
@@ -156,11 +156,13 @@ The \l {PropertyAnimation::}{to} property is also required to specify the new
 \section2 Standalone Animations
 
 Animations can also be created as ordinary QML objects that are not bound to
-any particular objects and properties. An example:
+any particular objects and properties. Here is an example, using a 
+PropertyAnimation object. The animation is explicitly started when the 
+\l Rectangle is clicked:
 
 \snippet doc/src/snippets/declarative/animation-standalone.qml 0
 
-A standalone animation is not running by default and must be started explicitly
+A standalone animation object is not running by default and must be started explicitly
 using the \l {Animation::}{running} property or \l {Animation::}{start()} and
 \l {Animation::}{stop()} methods. Since the animation is not bound to a
 particular object or property, it must define the \l
@@ -183,10 +185,13 @@ object and add it to an item's \l {Item::}{transitions} property. An example:
 
 \snippet doc/src/snippets/declarative/animation-transitions.qml 0
 
-When the \l Rectangle changes to the \e moved state, its \c x and \c y property
-values are changed by the PropertyChanges object, and the PropertyAnimation
-defined within the \l Transition is triggered on these properties. The
-animation will not be applied at any time other than during the state change.
+The PropertyChanges object in the \e moved state defines that when the
+\l Rectangle is in this state, its position should be changed
+to (50, 50). When the \l Rectangle changes to the \e moved state, the 
+\l Transition will be triggered, and the transition's \l PropertyAnimation will
+animate the changes in the \c x and \c y properties to their new values.
+The animation will not be applied at any time other than during the state 
+change.
 
 Notice the example does not set any \l {PropertyAnimation::}{from} and \l
 {PropertyAnimation::}{to} values for the PropertyAnimation. As a convenience,
@@ -234,7 +239,7 @@ and rotation changes.
 
 A ColorAnimation allows color values for the \l {ColorAnimation::}{from} 
 and \l {ColorAnimation::}{to} properties. The
-following animates the rectangle's \l {Rectangle::color} property:
+following animates the rectangle's \l {Rectangle::}{color} property:
 
 \snippet doc/src/snippets/declarative/animation-elements.qml color
 
diff --git a/doc/src/snippets/declarative/propertychanges.qml b/doc/src/snippets/declarative/propertychanges.qml
new file mode 100644
index 0000000..9f119bf
--- /dev/null
+++ b/doc/src/snippets/declarative/propertychanges.qml
@@ -0,0 +1,92 @@
+/****************************************************************************
+**
+** 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 QtDeclarative module 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 Technology Preview License Agreement accompanying
+** this package.
+**
+** 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 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+//![import]
+import Qt 4.7
+//![import]
+
+Column {
+
+//![0]
+Item {
+    id: container
+    width: 300; height: 300
+
+    Rectangle {
+        id: rect
+        width: 100; height: 100
+        color: "red"
+
+        MouseArea { 
+           id: mouseArea
+           anchors.fill: parent 
+        }
+
+        states: State {
+           name: "resized"; when: mouseArea.pressed
+           PropertyChanges { target: rect; color: "blue"; height: container.height }
+        }
+    }
+}
+//![0]
+
+//![reset]
+Rectangle {
+    width: 300; height: 200
+
+    Text {
+        id: myText
+        width: 50
+        wrapMode: Text.WordWrap
+        text: "a text string that is longer than 50 pixels"
+
+        states: State {
+            name: "widerText"
+            PropertyChanges { target: myText; width: undefined }
+        }
+    }
+
+    MouseArea {
+        anchors.fill: parent
+        onClicked: myText.state = "widerText"
+    }
+}
+//![reset]
+}
diff --git a/doc/src/snippets/declarative/rotationanimation.qml b/doc/src/snippets/declarative/rotationanimation.qml
index c81395a..b56cb3f 100644
--- a/doc/src/snippets/declarative/rotationanimation.qml
+++ b/doc/src/snippets/declarative/rotationanimation.qml
@@ -52,7 +52,8 @@ Item {
         smooth: true
 
         states: State { 
-            name: "rotated"; PropertyChanges { target: rect; rotation: 180 } 
+            name: "rotated"
+            PropertyChanges { target: rect; rotation: 180 } 
         }
 
         transitions: Transition {