GoSnap

GoSnap - Snaps windows to screen edges

GoSnap is a program that brings to AmigaOS a window snapping feature known from modern operating systems, allowing windows to snap to the edges  of the screen.

GoSnap creates 8 active zones on the Workbench screen: 4 screen corners and 4 edges. When a window is dragged to one of these zones,  it is automatically resized and repositioned.
The zones work as follows:

• 4 corners - dragging a window into a corner will resize it to 1/4  of the screen size and position it in that corner. 
• Left, right, and bottom edges - dragging a window to one of these  edges will resize it to 1/2 of the screen size and snap it to the corresponding edge.  
•  Top edge - dragging a window to the top edge of the screen will  maximize it to fill the entire screen.

GoSnap respects the minimum and maximum window sizes defined by the application's developer, as well as whether a window is resizable at all. If a window is not resizable, GoSnap will only reposition it without changing its size.

The program runs as a commodity and can be managed through the system Exchange utility, where it can be paused or disabled.

Requirements:
The program requires AmigaOS version 3.1.4 or newer; AmigaOS 3.2 is recommended.
In the system preferences (IControl), the option to allow windows to be dragged beyond the screen edge should be enabled.
GoSnap should also work under AmigaOS 4.1.

Installation:
Just copy GoSnap to any location and run it.
If you want GoSnap to start automatically with Workbench, copy it to the WBStartup drawer.

Configuration:
GoSnap offers several Tool Type options that affect how
the program behaves:    

• KEEP_MENUBAR=YES|NO - determines whether the top Workbench menubar should be covered when snapping a window to the top of the screen, or if it should always remain visible.    
• SNAP_MARGIN=10 - defines the size (in pixels) of the screen-edge area where window snapping is triggered (int, range: 2-100) 
• SNAP_MARGINPCT=3 - a parameter that defines the width and height of the snap area as a percentage of the screen’s width and height.      
  For example, on an 800×600 screen and with the parameter set to 3, the snap area near the left and right edges will be 24 pixels wide, and 18 pixels high near the top and bottom edges (int, range: 1-15).      
  If both parameters are defined (SNAP_MARGIN and SNAP_MARGINPCT),  SNAP_MARGINPCT takes priority over SNAP_MARGIN.
• SHOW_SNAP_AREA_AT_START=YES|NO - a test feature that displays defined snap zones when the program starts.

License & Donations:
GoSnap is FREEWARE, but if you find this tool useful, you are welcome to donate and help keep the author caffeinated:

https://www.paypal.me/krzysztofdonat

GoSnap is an entry into the Amiga 40 Tools Jam 2025 in the Commodity category.
It was written in Amiga E, using the excellent E-VO compiler:
http://aminet.net/package/dev/e/evo

History:
0.13 (2025-05-18)
  - Initial release.

0.14 (2025-05-19)
  - fix for snapping non-resizable windows

0.15 (2025-05-20)
  - Added ToolType parameter SNAP_MARGINPCT, defining the snap area
    as a percentage of the screen width/height.
  - improved calculation of snapped window positions.