resizable_columns 0.1.0

A Flutter widget that lays out panes in a row or a column with draggable dividers. Supports nesting, minimum sizes, pushing neighbouring panes and right-to-left layouts.

0.1.0

Added

• onSizesChanged reports the size of every pane while a divider is dragged, so a layout can be saved and restored through initialSizes.
• dragMode with ResizableDragMode.push: a divider goes past a pane that is at its minimum size and shrinks the panes further along. Dragging back within the same gesture gives them their space again. The default, ResizableDragMode.adjacent, is the previous behavior.
• dividerHitSize: a divider can be dragged by a 12 px area centered on it. The area lies over the edges of the panes and does not change the layout, and a tap inside it still reaches the pane. Before, only the divider itself could be dragged, which also means a divider with a thickness of 0 can now be dragged.
• Doc comments for the whole public API.
• Tests.
• The example runs on the web out of the box and shows fixed, scrolling, nested and oversized content.

Changed

• Breaking in debug builds: initialSizes must have one entry per child and cannot be combined with initialProportions. Both are asserts; in release an initialSizes list of the wrong length gives an equal split.
• Panes keep their proportions when the parent is resized, including after it shrinks and grows back.
• Panes are no longer rebuilt while a divider is dragged or when the parent is resized. The builders run when the widget itself is rebuilt or when something a pane depends on changes.
• Changing the number of children resets the sizes to the initial ones.
• alignment sets the cross-axis alignment in both orientations.
• A single child is allowed and fills the space.
• With draggable: false the dividers no longer change the mouse cursor.
• Requires Flutter 3.24 or later.
• The README is rewritten for the current API.

Fixed

• minChildSize was broken when the parent shrank.
• Adding a child crashed, and removing one left a gap.
• The divider moved against the pointer in right-to-left layouts.
• The divider drifted away from the pointer after it passed the minimum size of a pane.
• initialProportions that add up to zero crashed the layout.
• An unbounded parent crashed the layout. initialSizes are used there as they are, and an assert asks for them when they are missing.

0.0.2

• Added dividerColor to change the color of the divider.

0.0.1

• Initial release.