As a digression to my experiments with GTK4 and Haskell, inspired by a question at the Haskell Community, I looked at list views. A list view brings together a selection model and a list item factory. A selection model adds support for selection to a list model. A list item factory creates widgets for the […]

Another part of my experiments with GTK4 and Haskell was to investigate printing. That brought in the Cairo, Pango and PangoCairo C libraries, and the gi-cairo, gi-cairo-render, gi-cairo-connector, gi-pango, and gi-pangocairo Haskell packages. PrintOperation At the heart was to create a value of type PrintOperation, specifying its nPages and unit attributes and its handler of […]

I discovered that, with GTK4, when a vertical Box contains a Picture, and the width of the box is greater than that of the picture, the height of the box is set to maintain an aspect ratio that is the same as the picture’s: I wanted to avoid that behaviour. Horizontal box The solution was […]

My experiments with Haskell and GTK4 were heading towards something concrete, namely a GUI for a solver of Hashi puzzles. I had previously found Harald Bögeholz’s 2013 [open-source solver](https://github.com/ctbo/hashi) and forked it to create a command line application. hashi-solver.exe With a GUI application, it is perhaps easiest to start the journey with the destination: The […]

As part of my further experiments with GTK4 and Haskell, I wanted to vary gtk-picture by creating the Picture programatically. I named the alternative gtk-dynamic-picture. Diagrams I created the picture using the Diagrams project. I looked at various backends that support that project: Ultimately, given the pixel format of a Pixbuf value (R G B […]

On Windows 11, in File Explorer, gtk-picture.exe has Windows’ default icon for an executable file and GTK4’s default icon in the task bar when running: I wanted to customise these icons. Also, I wanted a similar icon to appear in the application’s window’s header bar, to the left. *.res file The icon can be set […]

As part of my experiments with GTK4 and Haskell, I sought an application with a picture which would report on the co-ordinates if clicked on with a mouse. For my example image, I took the Flammarion wood engraving. gtk-picture With Stack, I created a new single-package project gtk-picture with Main.hs: and package.yaml (extract): and Stack […]

It had been over two years since I last looked at them, but I returned to Haskell, GUI and GTK4 on Windows. This time, things were more straightforward. To set things up again, I added the following MSYS2 packages to the Stack-supplied MSYS2 with stack exec — pacman -S: and set PKG_CONFIG_PATH to the mingw64\lib\pkgconfig […]

The Haskell package static-bytes was spun out of the pantry package. Ilias Tsitsimpis reported that static-bytes-0.1.0 did not work as intended on big-endian machine architectures, specifically IBM’s s390x. A big-endian architecture stores the most significant byte of a multi-byte word at the lowest memory address. A little-endian architecture does the opposite. x86_64 is little-endian and […]

On 1 December 2022, members of Well-Typed provided a video guide to profiling memory usage of Haskell applications with tools eventlog2html and ghc-debug. I wondered if they would work on Windows 11. Building eventlog2html I could build the executable provided by package eventlog2html-0.11.0 with a project level configuration file: Update: Package eventlog2html-0.11.1, released 17 August […]