layout

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v0.1.105 Latest Latest Go to latest Published: Apr 1, 2026 License: MIT Imports: 4 Imported by: 0

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github.com/zodimo/go-compose

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Documentation ¶

Index ¶

type ContentScale
type LayoutCoordinates
type ScaleFactor

Constants ¶

This section is empty.

Variables ¶

This section is empty.

Functions ¶

This section is empty.

Types ¶

type ContentScale ¶

type ContentScale interface {
	// Scale returns the scale factor to apply to the source to fit the destination.
	Scale(srcSize, dstSize layoutnode.LayoutDimensions) ScaleFactor
}

ContentScale defines how to scale the source content to fit the destination space.

var (
	// ContentScaleNone maintains the source size.
	ContentScaleNone ContentScale = contentScaleFunc(func(srcSize, dstSize layoutnode.LayoutDimensions) ScaleFactor {
		return ScaleFactor{ScaleX: 1.0, ScaleY: 1.0}
	})

	// ContentScaleFillBounds scales the source to fill the destination bounds, potentially changing the aspect ratio.
	ContentScaleFillBounds ContentScale = contentScaleFunc(func(srcSize, dstSize layoutnode.LayoutDimensions) ScaleFactor {
		return computeFillScale(srcSize, dstSize)
	})

	// ContentScaleFillWidth scales the source to fill the destination width, maintaining the aspect ratio.
	ContentScaleFillWidth ContentScale = contentScaleFunc(func(srcSize, dstSize layoutnode.LayoutDimensions) ScaleFactor {
		return computeFillWidth(srcSize, dstSize)
	})

	// ContentScaleFillHeight scales the source to fill the destination height, maintaining the aspect ratio.
	ContentScaleFillHeight ContentScale = contentScaleFunc(func(srcSize, dstSize layoutnode.LayoutDimensions) ScaleFactor {
		return computeFillHeight(srcSize, dstSize)
	})

	// ContentScaleFit scales the source to fit within the destination bounds, maintaining the aspect ratio.
	// The source will be completely visible.
	ContentScaleFit ContentScale = contentScaleFunc(func(srcSize, dstSize layoutnode.LayoutDimensions) ScaleFactor {
		return computeFitScale(srcSize, dstSize)
	})

	// ContentScaleCrop scales the source to fill the destination bounds, maintaining the aspect ratio.
	// The source may be cropped.
	ContentScaleCrop ContentScale = contentScaleFunc(func(srcSize, dstSize layoutnode.LayoutDimensions) ScaleFactor {
		return computeCropScale(srcSize, dstSize)
	})

	// ContentScaleInside scales the source to fit within the destination bounds only if the source is larger than the destination.
	// Otherwise, it maintains the source size.
	ContentScaleInside ContentScale = contentScaleFunc(func(srcSize, dstSize layoutnode.LayoutDimensions) ScaleFactor {
		if srcSize.Size.X <= dstSize.Size.X && srcSize.Size.Y <= dstSize.Size.Y {
			return ScaleFactor{ScaleX: 1.0, ScaleY: 1.0}
		}
		return computeFitScale(srcSize, dstSize)
	})
)

type LayoutCoordinates ¶

type LayoutCoordinates interface {
	// IsAttached returns true if the layout is currently attached to the composition.
	IsAttached() bool

	// Size returns the size of this layout in pixels.
	Size() unit.IntSize

	// PositionInRoot returns the position of this layout relative to the root.
	PositionInRoot() geometry.Offset

	// PositionInWindow returns the position of this layout in window coordinates.
	PositionInWindow() geometry.Offset

	// LocalPositionOf converts a position from another LayoutCoordinates to this one.
	LocalPositionOf(sourceCoordinates LayoutCoordinates, relativeToSource geometry.Offset) geometry.Offset

	// VisibleBounds returns the visible bounds of this layout in local coordinates.
	VisibleBounds() geometry.Rect

	// BoundsInWindow returns the bounds of this layout in window coordinates.
	BoundsInWindow() geometry.Rect
}

LayoutCoordinates provides access to the position and size of a layout.

https://cs.android.com/androidx/platform/frameworks/support/+/androidx-main:compose/ui/ui/src/commonMain/kotlin/androidx/compose/ui/layout/LayoutCoordinates.kt

type ScaleFactor ¶

type ScaleFactor struct {
	ScaleX float32
	ScaleY float32
}

Source Files ¶

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