picoe/Eto

Allow a Control to be positioned directly in its parent Container, making PixelLayout obsolete

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#158 opened on Nov 20, 2013

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help wanted

Description

Problem:

  1. It is cumbersome to create a PixelLayout just to position a control.
  2. PixelLayout adds a new window to the container hierarchy, obscuring the content beneath and requiring event bubbling to register mouse clicks, etc.
  3. It isn't possible to explicitly position some controls while using a table layout for the rest of the Container's children.

Solution: These methods and properties allow a Control to be added and positioned directly on its parent:

  1. Container.Add(Control child): adds an absolutely positioned child
  2. Container.Remove(Control child): removes an absolutely positioned child
  3. Control.Location {get; set;} : The setter is new. Sets the position of this Control in its parent. This Control must have been added using Add.

Implementation Notes: Curtis mentioned GTK being problematic in that it required an explicit window. However, this is no longer the case, GTK.Fixed supports a windowless mode (HasWindow = false) and in fact Eto currently uses this mode.

Contributor guide

Tech stack
csharp
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.
1-2 days
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#GTKEto basics
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
30
Research direction
Investigate GTK.Fixed with HasWindow=false to implement absolute positioning. Implement Container.Add/Remove and Control.Location setter in Eto.Forms. Check the GTK backend for Eto to ensure compatibility and refer to the existing PixelLayout implementation for guidance. Consider handling coordinate transformation and reparenting.