slint-ui/slint

The internal components of the animation were not rendered

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#4,787 opened on Mar 7, 2024

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 (5 comments) (0 reactions) (0 assignees)Rust (22,596 stars) (881 forks)batch import
a:tool classes & property systemgood first issue

Description

  1. I used animation components in the animation component, but the internal components were not rendered
  2. Internal animation components width I use percentage. If I don't use percentages, it can render successfully
  3. If I don't use debug(self. width) in init, internal components won't render, see slintpad, code from @jui/drawer/drawer_left.slint
  4. But if I use debug(self. width) in init, internal components render success, see slintpad
  5. Difference code(On line 79 of slintpad)
// render success
export component AL inherits DrawerLeft {
    width: 100%;
    show: true;
    background: red;

    init => {
       debug(self.width)
    }
}

// won't render
export component AL inherits DrawerLeft {
    width: 100%;
    show: true;
    background: red;

    init => {
       // debug(self.width)
    }
}

Contributor guide

Tech stack
rust
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.
active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
mostly clear
Prerequisites
Basic knowledge of Slint syntaxUnderstanding of Slint animation and layoutFamiliarity with component inheritance
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
50
Research direction
Investigate why internal components are not rendered when using percentage widths in an inherited component's init block without a debug call. Compare the two Slintpad snippets: one with debug(self.width) that works, and one without that fails. The issue likely lies in the Slint runtime's layout calculation order during initialization. Check the component's width property resolution and ensure that the init block does not suppress necessary layout passes. Look at the slint compiler or runtime source code related to component initialization and layout propagation, particularly in files handling property bindings and animation.