How TVisualGrid admits one fetch at a time, keeps only the latest request and discards cancelled background results, using RefreshSuspended, CancelActiveFetch and RefreshThrottle.
Read articleHow to Apply Only the Latest Grid Refresh in Pascal
How to Buffer a Pascal Stream Without Breaking Its Cursor
Add read-ahead to any TStream with TBufferedStream, understand its logical and underlying cursors, and hand the source to another reader with FlushUnreadData.
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How to Build a Wizard That Changes Its Route at Runtime
Build a TWizard whose screens validate input, change the remaining route with UpdatePath, keep their state when removed from the path and allow Finish to be retried.
Read articleHow to Design a Pascal Cache Around Value Lifecycles
Derive a cache from TCacheBase and choose its expiration, staleness, eviction and dispose policies so cached objects are fetched, replaced and freed predictably.
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How to Manage Pascal Resources with Automatic Cleanup
Use TDisposables to free a group of objects in reverse order at scope exit, and TScope to return a lock acquisition with its release attached.
Read articleHow to Reuse a Pascal Grid in Delphi and Lazarus
Write one TVisualGrid configuration and one typed data source that compile for both Delphi VCL and Lazarus LCL, and see where the compiler-specific boundary sits.
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How to Turn a Burst of UI Events into One Useful Refresh
Coalesce bursts of UI notifications into one handler call with TThrottledEvent, choose a delivery mode, and observe or cancel pending delivery.
Read articleHow to Use Upgradeable Read Locks in Delphi and Free Pascal
Use TReadWriteLock's upgradeable read mode to inspect shared state and promote to a write lock without a release-and-recheck gap.
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How to Build a Grid That Adapts to Its Window
Use TVisualGrid page modes to show all rows, a fixed page size or as many rows as fit the window, with one data source and one set of column bindings.
Read articleHow to Page and Sort a Cached Dataset in Pascal
Implement a TCustomDataSource, describe filters and sorts with TColumnFilter, and use its snapshot cache to page a filtered, sorted dataset without reloading it.
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