new ChangeCounter(target)
A ChangeCounter keeps a target object whose change count is tracked by a
local change count. You can set to a new target which updates the local
change count, and you can call checkChanged to check if the target (or one of
the target's targets) has been changed. The target object must have a method
getChangeCount.
Create a new ChangeCounter to track the given target. If target is not null,
this sets the local change counter to target.getChangeCount().
Parameters:
| Name | Type | Description |
|---|---|---|
target |
object | The target to track, as an object with the method getChangeCount(). |
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Methods
checkChanged() → {boolean}
If the target's change count is different than the local change count, then
update the local change count and return true. Otherwise return false,
meaning that the target has not changed. Also, if the target is null,
simply return false. This is useful since the target (or one of the target's
targets) may be changed and you need to find out.
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Returns:
True if the change count has been updated, false if not.
- Type
- boolean
get() → {object}
Get the target object. If the target is changed, then checkChanged will
detect it.
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Returns:
The target, as an object with the method
getChangeCount().
- Type
- object
set(target)
Set the target to the given target. If target is not null, this sets the
local change counter to target.getChangeCount().
Parameters:
| Name | Type | Description |
|---|---|---|
target |
object | The target to track, as an object with the method getChangeCount(). |
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