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-** Contact: http://www.qt-project.org/legal
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-** GNU Free Documentation License Usage
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-
-/*!
-\page qdeclarativestates.html
-\ingroup qml-features
-\contentspage QML Features
-\previouspage {Importing Reusable Components}
-\nextpage {QML Animation and Transitions}{Animation and Transitions}
-\target qmlstates
-\title QML States
-
-\section1 States Elements
-\list
-\li \l State
-\li \l PropertyChanges
-\li \l StateGroup
-\li \l StateChangeScript
-\li \l ParentChange
-\li \l AnchorChanges
-\endlist
-
-Many user interface designs are \e state driven; interfaces have configurations
-that differ depending on the current state. For example, a traffic signal will
-configure its flags or lights depending on its state. While in the signal's
-\c stop state, a red light will turn on while the yellow and the green lights
-will turn off. In the \c caution state, the yellow light is on while the other
-lights are turned off.
-
-In QML, \e states are a set of property configurations defined in a \l State
-element. Different configurations could, for example:
-
-\list
-\li Show some UI elements and hide others
-\li Present different available actions to the user
-\li Start, stop, or pause animations
-\li Execute some script required in the new state
-\li Change a property value for a particular item
-\li Show a different view or screen
-\endlist
-
-All \l {Item}-based objects have a \c state property, and can specify additional
-states by adding new \c State objects to the item's \l {Item::}{states}
-property. Each state within a component has a unique \c name, an empty string
-being the default. To change the current state
-of an item, set the \l {Item::}{state} property to the name of the state.
-
-Non-Item objects may use states through the \l StateGroup element.
-
-\section1 Creating States
-
-To create a state, add a \l State object to the item's \l {Item::}{states} property,
-which holds a list of states for that item.
-
-A warning \c signal component may have two states, the \c NORMAL and the
-\c CRITICAL state. Suppose that in the \c NORMAL state, the \c color of the
-signal should be \c green and the warning \c flag is down. Meanwhile, in the
-\c CRITICAL state, the \c color should be \c red and the flag is \c up. We may
-model the states using the \c State element and the color and flag
-configurations with the \c PropertyChanges element.
-\snippet doc/src/snippets/declarative/states.qml signal states
-The \l PropertyChanges element will change the values of object properties.
-Objects are referenced through their \l {qml-id-property}{id}. Objects outside
-the component are also referenced using the \c id property, exemplified by the
-property change to the external \c flag object.
-
-Further, the state may change by assigning the \c state property with the
-appropriate signal state. A state switch could be in a \l MouseArea element,
-assigning a different state whenever the signal receives a mouse click.
-\snippet doc/src/snippets/declarative/states.qml switch states
-
-The State element is not limited to performing modifications on property values.
-It can also:
-\list
-\li Run some script using \l StateChangeScript
-\li Override an existing signal handler for an object using \l PropertyChanges
-\li Re-parent an \l Item using \l ParentChange
-\li Modify anchor values using \l AnchorChanges
-\endlist
-
-\section1 The Default State
-
-Every \l Item based component has a \c state property and a \e{default state}.
-The default state is the empty string (\c{""}) and contains all of an item's
-initial property values. The default state is useful for managing property
-values before state changes. Setting the \c state property to an empty string
-will load the default state.
-
-\section1 The \c when Property
-
-For convenience, the \l State element has a \c when property that can bind to
-expressions to change the state whenever the bound expression evaluates to
-\c true. The \c when property will revert the state back to the
-\l {The Default State}{default state} when the expression evaluates to false.
-
-\snippet doc/src/snippets/declarative/states.qml when property
-The \c bell component will change to the \c RINGING state whenever the
-\c signal.state is \c CRITICAL.
-
-\section1 Animating State Changes
-
-State changes induce abrupt value changes. The \l Transition element allow
-smoother changes during state changes. In transitions, animations and
-interpolation behaviors are definable. The
-\l {QML Animation and Transitions}{Animation and Transitions} article has more
-information about creating state animations.
-
-The \l {declarative/animation/states}{States and Transitions example}
-demonstrates how to declare a basic set of states and apply animated
-transitions between them.
-
-\l{Using QML Behaviors with States} explains a common problem when using Behaviors
-to animate state changes.
-
-\section1 State Fast Forwarding
-
-In order for Transition to correctly animate state changes, it is sometimes necessary
-for the engine to fast forward and rewind a state (that is, internally set and unset the state)
-before it is finally applied. The process is as follows:
-
-\list 1
-\li The state is fast forwarded to determine the complete set of end values.
-\li The state is rewound.
-\li The state is fully applied, with transitions.
-\endlist
-
-In some cases this may cause unintended behavior. For example, a state that changes
-a view's \e model or a Loader's \e sourceComponent will set these properties
-multiple times (to apply, rewind, and then reapply), which can be relatively expensive.
-
-State fast forwarding should be considered an implementation detail,
-and may change in later versions.
-
-*/