Delphi Float Spin Edit

The VCL ships TSpinEdit for integers, but anything more sophisticated — a decimal step, a constrained range, a specific number of decimal places — means you build your own. This component is "your own", reused: a clean floating-point spin edit with everything TSpinEdit doesn't have.

What it does

A spin-edit-style control that holds a floating-point value (Double precision). Configurable minimum, maximum, step size, and number of decimal places. Up/down buttons increment by the step. Direct typing is validated against the range and clamped on commit. Locale-aware decimal separator (comma vs dot).

Properties

• Value: Double — the current value
• MinValue / MaxValue: Double — the allowed range
• Increment: Double — step size for the up/down buttons
• DecimalPlaces: Integer — precision shown
• ReadOnly: Boolean — lock the value for display-only use

When you need it

• Scientific or engineering apps with continuous-valued parameters
• Audio / video apps with percentage, decibel, or rate controls
• Any UI where you'd otherwise have to write a "TEdit + buttons + parsing" combo

What's bundled

• VCL component package for Delphi (current versions)
• Full Pascal source
• Demo project

System requirements

• Embarcadero Delphi (works back to XE)
• VCL target (Windows)