CoatiSoftware/Sourcetrail

Hold space to pan graph by dragging from anywhere

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#713 opened on Jul 29, 2019

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featuregood first issue

Description

like in Photoshop

Currently you can only pan the whole graph when clicking and dragging into the background area.

With this change, holding down space should allow to click anywhere to drag the whole graph, even when the mouse is currently over a node or edge.

Implementation suggestion:

  • QtGraphNode and QtGraphEdge need to ignore the mouse drag event when space is held down
  • QtGraphicsView needs to handle the drag when space is held down.

Contributor guide

Tech stack
ccpp
Domain
desktop
Issue type
feature
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.
mostly clear
Prerequisites
C++Qt frameworkunderstanding of graphics view
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
40
Research direction
The issue suggests modifying mouse event handling in QtGraphNode and QtGraphEdge to ignore drag events when space is held, and QtGraphicsView to handle the panning. Look at the Sourcetrail source code for classes QtGraphNode, QtGraphEdge, and QtGraphicsView to understand the current event handling. Check if there are any existing key event overrides or similar implementations in the codebase.