LMMS/lmms

Fix/Improve PianoRoll Knife Tool UI

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#7,814 opened on Mar 25, 2025

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good first issuegui

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Description

Currently the knife tool in the piano roll is hidden behind the tool menu, when it probably should reside along with the other modes buttons, such as draw/erase/select/pitch bending.

Also, it would probably be good to add a TextFloat which appears when the user enters the knife mode giving some simple tips/instructions, particularly that you can use Shift to automatically remove the cut ends of the notes.

I am mostly just making this issue as a reminder for me to come back and fix these things, but if anyone wants to tackle these, feel free!

Contributor guide

Research direction
Examine the piano roll UI implementation to locate where tool buttons are created (e.g., draw, erase, select). Add the knife tool button to the same toolbar. Implement a TextFloat widget that displays instructions (e.g., 'Use Shift to remove cut ends') when knife mode is active.
Tech stack
None
Domain
desktopaudio video rtc
Issue type
Feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Fresh
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
C++QtGit
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
75