Recently, I had to customize NSIS installers for work.

It was my first time, and I had to get to know this tool first. While this system already offers many functionalities, if you want to change anything in its built-in pages, you must rely on Win32 APIs.

The welcome and finish pages are an exception, up to a certain sense, because they are made with nsDialogs, NSIS’s plugin for creating completely custom pages.

As a result, it is possible to pass to add new widgets using the same API in a function passed MUI_PAGE_CUSTOMFUNCTION_SHOW. However, I encountered a major problem: the default widgets fill the available space. Therefore, any new widgets will be hidden, and it will not be possible to interact with them with the mouse. I looked for a solution online - NSIS is more than 20 years old, so you can find a lot of documentation - but I did not find an answer that worked for me.

Eventually, I found that you can resize widgets on Win32 with MoveWindow. … [Leggi il resto]