Qt Splitter Setsizes

A domain-focused calculator to compute and validate Qt splitter setSizes configurations for reliable pane distribution in GUI layouts.

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About This Tool

The tool analyzes Qt splitter layouts by modeling the setSizes input as a sequence of pane sizes that sum to a total available space. It accepts inputs such as pane_count, total_size_units, and optional initial_sizes or ratios, and returns a validated sizes array ready for Qt code. This supports deterministic pane distribution across resizes and platform variations.
Conceptually, it uses proportional distribution when ratios are provided, or equal distribution when none are given. It applies a rounding strategy to ensure the sum matches the total while preserving relative proportions, and it can enforce optional min/max constraints per pane. Edge cases such as zero or negative totals, mismatched input lengths, or missing required inputs are detected and reported through structured outputs.
Who benefits? Qt developers, UI engineers, and test teams seeking repeatable, exportable setSizes sequences for CI, design reviews, or code generation. Unique value comes from explicit handling of rounding, constraints, and emission of code-ready results that can be pasted into a Qt application or test fixture.

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How to Use

Provide inputs: specify pane_count, total_size_units, and optional initial_sizes or ratios.
Choose distribution mode: proportional (with ratios) or equal (no ratios).
Run calculation: tool derives a sizes array that sums to total_size_units.
Review outputs: sizes array, sum, and any adjustments for min/max constraints.
Export or copy the code-ready result for Qt implementation.

Frequently Asked Questions

Find Quick Answers

What is setSizes in Qt?

Qt's QSplitter uses setSizes to define the initial and current widths of each pane in pixels. The tool computes a valid setSizes sequence that sums to the container size, ensuring the GUI remains deterministic during user-initiated resizes and across platform rendering.

How are decimals handled?

The tool uses rounding to integers when distributing total space. If the initial proportional values produce fractional results, it applies a largest-remainder method to minimize drift and preserve the intended ratios while guaranteeing exact total.

Can I enforce minimum sizes?

Yes. You can specify min_sizes and max_sizes for each pane. The algorithm clamps values within those bounds and redistributes remaining space while maintaining overall sum. This helps avoid collapsed panes and overly large panes in constrained layouts.

Can results be exported as Qt code?

Outputs can be exported as code-ready formats such as a Python snippet for Qt or directly as a C++ initializer list for setSizes. This supports integration into tests, CI pipelines, and documentation, reducing manual transcription errors.

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