Question 1

How to handle button click events in liblcl?

Accepted Answer

Define a callback function like 'onButton1Click' and use Button_SetOnClick to assign it. The README example shows this with a simple event that displays a message, but you must manage callback registration manually.

Question 2

LibLCL or Qt for C++ desktop applications?

Accepted Answer

LibLCL offers native widgets via Lazarus LCL with a straightforward C API, but Qt has a larger ecosystem, better documentation, and more features. Choose liblcl if you prefer a lightweight, native approach without Qt's licensing fees, but expect less tooling.

Question 3

Can I use liblcl with Rust without issues?

Accepted Answer

Yes, liblcl includes a binding generator for Rust, but you'll need to generate and integrate the bindings. Event handling requires interfacing with C callbacks, which can be complex in Rust due to safety and lifetime concerns.

Question 4

What's the licensing for liblcl in commercial projects?

Accepted Answer

LibLCL uses the same modified LGPL license as Lazarus LCL, allowing use in proprietary software with conditions like dynamic linking and providing source for modifications to the library itself. Check the COPYING.modifiedLGPL file for details.

Question 5

How to load UI layouts from files in liblcl?

Accepted Answer

Use ResFormLoadFromFile or ResFormLoadFromStream functions, as shown in the README example. You can create layout files in Lazarus IDE and load them dynamically, but this requires separate design work in Lazarus.

Question 6

Is liblcl suitable for high-performance applications?

Accepted Answer

It leverages native widgets, so performance is generally good for standard desktop apps, but it may not match the optimization of frameworks like Qt for complex UIs, and event handling overhead could impact responsiveness in heavy-use scenarios.

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