eclipse-theia/theia

Scrolling the Files view while moving a file does not work

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#2,918 opened on Sep 19, 2018

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Description

Let's say you want to move a file from a directory to another in the Files view, but the target directory is outside of the view, meaning you would need to scroll down. In most UIs, bringing the dragged element near the bottom edge of the screen would slowly scroll down, allowing you to reach the target directory. Alternatively, using the mousewheel while dragging could work too.

Neither of them works in Theia (tested on Chromium on Linux), meaning it's very difficult to move a file to a directory that is outside of view.

Contributor guide

Tech stack
typescripthtmlcss
Domain
frontend
Issue type
bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
half day
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
stale
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
Theia widget systemHTML5 Drag and Drop APITypeScript
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
55
Research direction
The Files view implementation is likely in the 'packages/files' directory of the Theia repository. Look for drag and drop event handlers in the file tree widget (e.g., 'file tree.ts' or similar). The auto scroll behavior can be implemented by checking the mouse position relative to the widget's bounding box during drag and programmatically scrolling. Refer to the existing drag implementation and add scroll on drag functionality. The issue is from 2018; verify if any changes since then have affected this behavior.