As a second step in my goal to implement full text search functionality in my Delphi application I had to create a sample SQLite database supporting FTS queries.
Full text search models in databases allow to do what Google does with web documents – quickly search for documents containing some word (token).
Starting with Windows Vista (and Windows Server 2008) the Windows API arsenal has a new and more powerful way of performing file operations like copy, move, delete and similar file and folder shell actions. The old (but still valid) SHFileOperation function is now replaced by the IFileOperation interface.
The IFileOperation exposes methods to copy, move, rename, create, and delete Shell items as well as methods to provide progress and error dialogs.
I’m a huge fan of one big gem in the Delphi third party controls arena: Virtual Tree View.
Whatever issue I had to solve in my applications harvesting the power of the TVirtualStringTree, the component had the answer, either through vast amount of properties or through nicely exposed events.
The only solution I was not able to find straight forward, or out of the box, is how to have a visual indication that the currently focused node is not visible in the tree. Not “not visible” as hidden but not visible as currently not in view.
Ah, even after years of programming in Delphi, there’s still something new I learn every day (lucky me).
Just recently I needed to have hints (help tooltips) for some buttons to stay visible longer than hints for other controls (like edits, memos and alike).
Found no straight forward solution here…
Do users of your Delphi application actually see the progress bar moving?
The TProgressBar control provides visual feedback about the progress of some actions within your application. The Position, Max and Min properties determine the current position of the progress bar within its minimum and maximum values.
I guess you might not know what the term “dangling pointer” means, but if you have ever done some more complex programming in Delphi (where you do not only put controls on a form and handle a few events – rather you create and use objects at run-time) you might have experienced weird Access Violations when you tried accessing properties of an object you though is “Assigned” (or not nil).