How do I change the value of a ValueModel without triggering any updates?
• By using setValue: newValue method instead of value: newValue method. setValue: method replaces the value instance variable without sending update messages to dependents. • Remove the DependencyTransformer from the ValueModel’s dependents. Send retractInterestsFor: anObject message to the ValueModel. This is done just prior to sending value: newValue message. Using setValue: disallows all updates. retractInterestsFor: only disallows a specific update, allowing all others to proceed.
Ans. 1. By using setValue: newValue method instead of value: newValue method. setValue: method replaces the value instance variable without sending update messages to dependents. 2. Remove the DependencyTransformer from the ValueModel’s dependents. Send retractInterestsFor: anObject message to the ValueModel. This is done just prior to sending value: newValue message. Using setValue: disallows all updates. retractInterestsFor: only disallows a specific update, allowing all others to proceed.
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