Qt Splitter Size

A developer-focused calculator to determine and validate Qt splitter pane sizes for stable, responsive user interfaces.

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About This Tool

This tool computes deterministic splitter pane sizes for Qt's QSplitter. It targets developers who design desktop UIs and require predictable distribution of space across panes for a range of window sizes. It models total available space, pane counts, and per-pane minimums to produce valid distributions that can be applied in code or during layout planning. Conceptually, it takes total_space and pane_count, optionally min per-pane, and a distribution method, and outputs sizes in both px and percent. It supports equal, weighted, and custom ratios while enforcing constraints and providing code-ready distributions for integration. The tool works with fixed space values or scenarios where the container resizes, enabling planning for responsive layouts. It can generate outputs suitable for initialization code, test harness validation, or UI documentation. Practical examples illustrate how rounding and minimums affect final sizes: with total_space 800 px, two panes, and equal distribution, you obtain approximately 400 px per pane; with ratios [1,2], sizes are proportional and then adjusted to meet minimums. The result set includes both pixel and percent representations to simplify integration across code and design reviews. This combination of exact calculations and flexible options reduces manual math, accelerates iterative design, and improves consistency across Qt-based applications.

How to Use

  1. Provide inputs: total_space_px, pane_count, min_per_pane_px (optional), handle_size_px (optional), distribution_method and ratios (if custom).
  2. Run calculation to compute pane sizes.
  3. Review outputs: sizes_px and sizes_percent.
  4. Validate constraints: sum equals total_space and all minimums respected.
  5. Export code-ready distribution for integration.
How to use qt splitter set size

Frequently Asked Questions

Find Quick Answers

What happens if total_space is less than the sum of minimums?
If sum of minimums exceeds total_space_px, the tool reports a domain error and suggests alternatives such as lowering minimums, increasing total space, or selecting a different distribution method. It avoids producing negative or zero pane sizes.
Can I export the result as code?
Yes. The tool produces both pixel and percentage distributions that can be copied into Qt layout code, such as initial allocation for QSplitter or dynamic resizing logic, enabling seamless integration without manual calculations.
Does it support more than two panes?
Yes. The calculator handles 3 or more panes by applying equal, weighted, or custom ratios across all panes, ensuring the sum matches the total space and each pane meets its minimum requirement.

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