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-rw-r--r--doc/src/declarative/propertybinding.qdoc56
-rw-r--r--doc/src/getting-started/examples.qdoc1
2 files changed, 46 insertions, 11 deletions
diff --git a/doc/src/declarative/propertybinding.qdoc b/doc/src/declarative/propertybinding.qdoc
index 02f9868..ab3682d 100644
--- a/doc/src/declarative/propertybinding.qdoc
+++ b/doc/src/declarative/propertybinding.qdoc
@@ -78,16 +78,52 @@ Rectangle {
}
\endcode
-Being JavaScript expressions, bindings are evaluated in a scope chain. The \l {QML Scope}
-documentation covers the specifics of scoping in QML.
-
-\list
-\o When does a binding not get updated?
-\o Scope
-\o Assigning a constant/other binding clears existing binding
-\o Loops
-\o Using model data
-\endlist
+While syntactically bindings can be of arbitrary complexity, if a binding starts to become
+overly complex - such as involving multiple lines, or imperative loops - it may be better
+to refactor the component entirely, or at least factor the binding out into a separate
+function.
+
+\section1 Changing Bindings
+
+The \l PropertyChanges element can be used within a state change to modify the bindings on
+properties.
+
+This example modifies the \l Rectangle's width property binding to be \c {otherItem.height}
+when in the "square" state. When it returns to its default state, width's original property
+binding will have been restored.
+
+\code
+Rectangle {
+ id: rectangle
+ width: otherItem.width
+ height: otherItem.height
+
+ states: State {
+ name: "square"
+ PropertyChanges {
+ target: rectangle
+ width: otherItem.height
+ }
+ }
+}
+\endcode
+
+Imperatively assigning a value directly to a property will also implicitly remove a binding
+on a property. A property can only have one value at a time, and if code explicitly sets
+this value the binding must be removed. The \l Rectangle in the example below will have
+a width of 13, regardless of the otherItem's width.
+
+\code
+Rectangle {
+ width: otherItem.width
+
+ Component.onCompleted: {
+ width = 13;
+ }
+}
+\endcode
+
+There is no way to create a property binding directly from imperative JavaScript code.
\section1 Binding Element
diff --git a/doc/src/getting-started/examples.qdoc b/doc/src/getting-started/examples.qdoc
index 9ddafc4..071a107 100644
--- a/doc/src/getting-started/examples.qdoc
+++ b/doc/src/getting-started/examples.qdoc
@@ -159,7 +159,6 @@
\endfloat
The Qt Declarative module provides a declarative framework for building
highly dynamic, custom user interfaces.
- classes.
\clearfloat
\section1 \l{Painting Examples}{Painting}