CLayout

parentWidget(): CWidget | null;

Returns the widget managed by this layout, or `null` if none is set.

setParentWidget(widget: CWidget | null): void;

Sets the widget managed by this layout and reparents contained widgets.

addWidget(widget: CWidget): void;

Adds a widget to the layout.

setAlignment(widget: CWidget, alignment: CAlignment | 0): boolean;

Sets alignment for a directly managed widget; returns false when not found.

addStretch(stretch: number): void;

Adds an empty stretch item with the specified stretch factor.

count(): number;

Returns the number of items in the layout.

widgetAt(index: number): CWidget | null;

Returns the widget at the specified item index, or `null`.

removeWidget(widget: CWidget): void;

Removes the specified widget from the layout.

spacing(): number;

Returns the spacing between layout items in pixels.

setSpacing(spacing: number): void;

Sets the spacing between layout items in pixels.

contentsMargins(): CMargins;

Returns a copy of the layout's content margins.

setContentsMargins(left: number, top: number, right: number, bottom: number): void;

Sets the content margins in pixels.

clear(): void;

Removes all items from the layout.

protected addItem(item: CLayoutItem): boolean;

Adds a layout item and returns whether it was accepted.

protected insertItem(index: number, item: CLayoutItem): boolean;

Inserts a layout item and returns whether it was accepted.

protected itemAt(index: number): CLayoutItem | null;

Returns the layout item at the specified index, or `null`.

protected items(): readonly CLayoutItem[];

Returns the layout items as a read-only array.

hasHeightForWidth(): boolean;

Whether any managed widget has a width-dependent preferred height.

heightForWidth(_width: number): number;

Layouts with width-dependent geometry override this calculation.

abstract sizeHint(): CSize;

Returns the preferred size required by the layout.

abstract update(): void;

Recalculates and applies the geometry of managed widgets.

protected static layoutAxisBounds(widget: CWidget, horizontal: boolean, geometryFallback?: boolean, width?: number): CLayoutAxisBounds;

protected static layoutItemAxisBounds(item: CLayoutItem, horizontal: boolean, width?: number): CLayoutAxisBounds;

Axis constraints for widget items and non-widget spacer items.

protected static itemAxisAlignment(item: CLayoutItem, horizontal: boolean): number;

protected static itemWidth(item: CLayoutItem, available: number): number;

Actual width within an allocated cell, respecting alignment and policy bounds.

protected static setAlignedItemGeometry(item: CLayoutItem, x: number, y: number, width: number, height: number): void;

Places the item inside a cell; flags only constrain their respective axis.

protected static layoutAxisSizes(available: number, minimums: number[], preferred: number[], maximums: number[], weights: number[], priorities: number[]): number[];

Internal bounded allocation; larger priorities receive extra space first.