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-rw-r--r--src/declarative/qml/qdeclarativecomponent.cpp28
1 files changed, 23 insertions, 5 deletions
diff --git a/src/declarative/qml/qdeclarativecomponent.cpp b/src/declarative/qml/qdeclarativecomponent.cpp
index 04ec382..36c4b49 100644
--- a/src/declarative/qml/qdeclarativecomponent.cpp
+++ b/src/declarative/qml/qdeclarativecomponent.cpp
@@ -108,27 +108,45 @@ class QByteArray;
\brief The Component element encapsulates a QML component definition.
Components are reusable, encapsulated QML elements with well-defined interfaces.
- They are often defined in \l {qdeclarativedocuments.html}{Component Files}.
- The \e Component element allows defining components within a QML file.
- This can be useful for reusing a small component within a single QML
- file, or for defining a component that logically belongs with the
- file containing it.
+ Components are often defined by \l {qdeclarativedocuments.html}{component files} -
+ that is, \c .qml files. The \e Component element allows components to be defined
+ within QML items rather than in a separate file. This may be useful for reusing
+ a small component within a QML file, or for defining a component that logically
+ belongs with other QML components within a file.
+
+ For example, here is a component that is used by multiple \l Loader objects:
\qml
Item {
Component {
id: redSquare
+
Rectangle {
color: "red"
width: 10
height: 10
}
}
+
Loader { sourceComponent: redSquare }
Loader { sourceComponent: redSquare; x: 20 }
}
\endqml
+
+ Notice that while a \l Rectangle by itself would be automatically
+ rendered and displayed, this is not the case for the above rectangle
+ because it is defined inside a \c Component. The component encapsulates the
+ QML elements within, as if they were defined in a separate \c .qml
+ file, and is not loaded until requested (in this case, by the
+ two \l Loader objects).
+
+ The Component element is commonly used to provide graphical components
+ for views. For example, the ListView::delegate property requires a Component
+ to specify how each list item is to be displayed.
+
+ Component objects can also be dynamically generated using
+ \l{Qt::createComponent}{Qt.createComponent()}.
*/
/*!