August 2007
Intermediate to advanced
864 pages
25h 52m
English
Content preview from Programming WPF, 2nd Edition
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Timelines
A timeline represents a stretch of time. It usually also describes
one or more things that happen during that time. All timeline types
derive from the Timeline base class,
which defines various common properties. For example, the animation
types described in the preceding section are timelines. Consider this
DoubleAnimation:
<DoubleAnimation From="10" To="300" BeginTime="0:0:2" Duration="0:0:5" />
Timelines of all kinds have a start time and a duration
identifying the particular stretch of time they describe. The Duration property indicates that this DoubleAnimation represents a five-second
stint. As the BeginTime property
indicates, it starts at an offset of two seconds. BeginTime is relative to the timeline's
container. For example, if an animation is defined inside a storyboard,
the start time is relative to when the storyboard begins. If the start
time is not specified, it defaults to 0:0:0. BeginTime and Duration are just two of the standard
properties available on every timeline. Table 16-3 shows the properties common to all
timelines.
Table 16-3. Timeline properties
Property | Usage |
|---|---|
AccelerationRatio | Causes the timeline to ramp up to speed at the start |
AutoReverse | Makes the timeline run in reverse once it reaches the end |
BeginTime | Start time, relative to parent |
DecelerationRatio | Causes the timeline to slow down toward the end |
Duration | The length of the timeline |
FillBehavior | How the timeline behaves when it reaches its natural end |
Name | An optional name |
RepeatBehavior | Indicates whether ... |
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