Customizing Line Height

The wind plugin provides a comprehensive system for managing line heights in Flutter through the WindTheme class. By using pre-defined line heights, arbitrary custom values, or programmatic customization, you can ensure your application’s typography aligns with your design specifications.

Default Line Heights 🎨

The WindTheme class includes several pre-defined line heights, each mapped to intuitive keys. These values are specified in em units and can be directly used with your text components.

Key	Value (em)	Description
3	0.75	Compact line height
4	1	Standard compact
5	1.25	Slightly expanded
6	1.5	Comfortable
7	1.75	Spacious
8	2	Very spacious
9	2.25	Extra spacious
10	2.5	Maximum spaciousness
none	1	No additional spacing
tight	1.25	Tight spacing
snug	1.375	Snug spacing
normal	1.5	Normal spacing
relaxed	1.625	Relaxed spacing
loose	2	Loose spacing

For example:

• Using leading-3 applies a line height of 0.75em.
• Using leading-8 applies a line height of 2em.

Arbitrary Line Heights 🎯

The wind plugin supports arbitrary line heights for dynamic customization. You can specify custom line heights using the leading-[value] syntax, where value is the desired height in em units.

Examples:

• leading-[1.2] applies a line height of 1.2em.
• leading-[2.8] applies a line height of 2.8em.

This feature is ideal for achieving unique line heights beyond the predefined values.

Managing Line Heights Dynamically

The WindTheme class provides methods to check, retrieve, add, and remove line heights dynamically.

Checking if a Line Height Exists

To verify if a specific line height is defined:

bool exists = WindTheme.hasLineHeight('normal');
print(exists); // Output: true

Retrieving a Line Height

To fetch the value of a specific line height:

double height = WindTheme.getLineHeight('tight');
print(height); // Output: 1.25

Adding or Updating a Line Height

To define a new line height or modify an existing one:

// Add a custom line height
WindTheme.setLineHeight('custom', 1.2);

// Update an existing line height
WindTheme.setLineHeight('snug', 1.4);

Removing a Line Height

To remove a line height from the WindTheme:

WindTheme.removeLineHeight('custom');