Max Height

Introduction

The Max Height variable sets the maximum height in pixels. This value is applied after all other layout so it can be used to overwrite automatically-assigned height.

By default this value is <NULL> which means there is no Max Height.

A ColoredRectangle with no Max Height

If Max Height is assigned (not <NULL>), then the effective height cannot be larger than the Max Height value. The following animation shows that height is limited to a Max Height of 100.

Max Height set to 100 limits the ColoredRectangle's height

Notice that the Height variable can still be set to a value larger than the Max Height, but it does not apply visually.

Max Height can also be used if Height Units is set to values other than Absolute. For example, Max Height can be used to limit the height of a ColoredRectangle when Height Units is Relative to Parent.

Rectangle's height limited by its Max Height of 100

Max Height and Relative to Children

Note that Max Height can prevent a container from growing according to its children. For more information, see the Relative to Children Height Units page.

A container with a Top to Bottom Stack grows to its Max Height when its children need more space. The child that crosses the max extends past the container's bottom edge. If the container also has Wraps Children checked, it stops at the bottom edge of the last child that fits, since the next child moves to a new column. For more information see the Children Layout page.

Breaking change in November 2026: Before this version, a stack without Wraps Children stopped growing at the last child that fit under its max, the same as a wrapping stack, so it could end up smaller than its max. Available in November 2026, or now if building Gum from source. For more information see Migrating to 2026 November.