FocusObserverModifier

Kotlin |Java

interface FocusObserverModifier : Modifier.Element

androidx.compose.ui.FocusObserverModifier

A modifier that can be used to observe focus state changes.

Summary

Inherited functions

From class Element

`Boolean`	`all(predicate: (Modifier.Element) -> Boolean)` Returns `true` if predicate returns true for all Elements in this Modifier or if this Modifier contains no Elements.
`Boolean`	`any(predicate: (Modifier.Element) -> Boolean)` Returns `true` if predicate returns true for any Element in this Modifier.
`R`	`foldIn(initial: R, operation: (R, Modifier.Element) -> R)` Accumulates a value starting with initial and applying operation to the current value and each element from outside in. Elements wrap one another in a chain from left to right; an Element that appears to the left of another in a `+` expression or in operation's parameter order affects all of the elements that appear after it. foldIn may be used to accumulate a value starting from the parent or head of the modifier chain to the final wrapped child.
`R`	`foldOut(initial: R, operation: (Modifier.Element, R) -> R)` Accumulates a value starting with initial and applying operation to the current value and each element from inside out. Elements wrap one another in a chain from left to right; an Element that appears to the left of another in a `+` expression or in operation's parameter order affects all of the elements that appear after it. foldOut may be used to accumulate a value starting from the child or tail of the modifier chain up to the parent or head of the chain.

From class Modifier

Modifier

plus(other: Modifier)

Concatenates this modifier with another.

Returns a Modifier representing this modifier followed by other in sequence.

Modifier

then(other: Modifier)

Concatenates this modifier with another.

Returns a Modifier representing this modifier followed by other in sequence.

Inherited extension functions

From androidx.compose.foundation.layout

Modifier	`Modifier.absoluteOffset(x: Dp = 0.dp, y: Dp = 0.dp)` Offset the content by (x dp, y dp).
Modifier	`Modifier.absoluteOffsetPx(x: State<Float> = mutableStateOf(0f), y: State<Float> = mutableStateOf(0f))` Offset the content by (x px, y px).
Modifier	`Modifier.absolutePadding(left: Dp = 0.dp, top: Dp = 0.dp, right: Dp = 0.dp, bottom: Dp = 0.dp)` Apply additional space along each edge of the content in Dp: left, top, right and bottom.
Modifier	`Modifier.aspectRatio(@FloatRange(0.0, 3.4E38, false) ratio: Float)` Attempts to size the content to match a specified aspect ratio by trying to match one of the incoming constraints in the following order: Constraints.maxWidth, Constraints.maxHeight, Constraints.minWidth, Constraints.minHeight.
Modifier	`Modifier.defaultMinSizeConstraints(minWidth: Dp = Dp.Unspecified, minHeight: Dp = Dp.Unspecified)` Constrain the size of the wrapped layout only when it would be otherwise unconstrained: the minWidth and minHeight constraints are only applied when the incoming corresponding constraint is `0`.
Modifier	`Modifier.fillMaxHeight(@FloatRange(0.0, 1.0) fraction: Float = 1f)` Have the content fill (possibly only partially) the Constraints.maxHeight of the incoming measurement constraints, by setting the minimum height and the maximum height to be equal to the maximum height multiplied by fraction.
Modifier	`Modifier.fillMaxSize(@FloatRange(0.0, 1.0) fraction: Float = 1f)` Have the content fill (possibly only partially) the Constraints.maxWidth and Constraints.maxHeight of the incoming measurement constraints, by setting the minimum width and the maximum width to be equal to the maximum width multiplied by fraction, as well as the minimum height and the maximum height to be equal to the maximum height multiplied by fraction.
Modifier	`Modifier.fillMaxWidth(@FloatRange(0.0, 1.0) fraction: Float = 1f)` Have the content fill (possibly only partially) the Constraints.maxWidth of the incoming measurement constraints, by setting the minimum width and the maximum width to be equal to the maximum width multiplied by fraction.
Modifier	`Modifier.height(height: Dp)` Declare the height of the content to be exactly heightdp.
Modifier	`Modifier.heightIn(min: Dp = Dp.Unspecified, max: Dp = Dp.Unspecified)` Constrain the height of the content to be between mindp and maxdp.
Modifier	`Modifier.offset(x: Dp = 0.dp, y: Dp = 0.dp)` Offset the content by (x dp, y dp).
Modifier	`Modifier.offsetPx(x: State<Float> = mutableStateOf(0f), y: State<Float> = mutableStateOf(0f))` Offset the content by (x px, y px).
Modifier	`Modifier.padding(start: Dp = 0.dp, top: Dp = 0.dp, end: Dp = 0.dp, bottom: Dp = 0.dp)` Apply additional space along each edge of the content in Dp: start, top, end and bottom.
Modifier	`Modifier.padding(horizontal: Dp = 0.dp, vertical: Dp = 0.dp)` Apply horizontal dp space along the left and right edges of the content, and vertical dp space along the top and bottom edges.
Modifier	`Modifier.padding(all: Dp)` Apply all dp of additional space along each edge of the content, left, top, right and bottom.
Modifier	`Modifier.padding(padding: PaddingValues)` Apply PaddingValues to the component as additional space along each edge of the content's left, top, right and bottom.
Modifier	`Modifier.preferredHeight(intrinsicSize: IntrinsicSize)` Declare the preferred height of the content to be the same as the min or max intrinsic height of the content.
Modifier	`Modifier.preferredHeight(height: Dp)` Declare the preferred height of the content to be exactly heightdp.
Modifier	`Modifier.preferredHeightIn(min: Dp = Dp.Unspecified, max: Dp = Dp.Unspecified)` Constrain the height of the content to be between mindp and maxdp as permitted by the incoming measurement Constraints.
Modifier	`Modifier.preferredSize(size: Dp)` Declare the preferred size of the content to be exactly sizedp square.
Modifier	`Modifier.preferredSize(width: Dp, height: Dp)` Declare the preferred size of the content to be exactly widthdp by heightdp.
Modifier	`Modifier.preferredSizeIn(constraints: DpConstraints)` Constrain the size of the content to be within constraints as permitted by the incoming measurement Constraints.
Modifier	`Modifier.preferredSizeIn(minWidth: Dp = Dp.Unspecified, minHeight: Dp = Dp.Unspecified, maxWidth: Dp = Dp.Unspecified, maxHeight: Dp = Dp.Unspecified)` Constrain the width of the content to be between minWidthdp and maxWidthdp and the height of the content to be between minHeight and maxHeight as permitted by the incoming measurement Constraints.
Modifier	`Modifier.preferredWidth(intrinsicSize: IntrinsicSize)` Declare the preferred width of the content to be the same as the min or max intrinsic width of the content.
Modifier	`Modifier.preferredWidth(width: Dp)` Declare the preferred width of the content to be exactly widthdp.
Modifier	`Modifier.preferredWidthIn(min: Dp = Dp.Unspecified, max: Dp = Dp.Unspecified)` Constrain the width of the content to be between mindp and maxdp as permitted by the incoming measurement Constraints.
Modifier	`Modifier.relativePaddingFrom(alignmentLine: AlignmentLine, before: Dp = Dp.Unspecified, after: Dp = Dp.Unspecified)` A Modifier that can add padding to position the content according to specified distances from its bounds to an alignment line.
Modifier	`Modifier.size(size: Dp)` Declare the size of the content to be exactly sizedp width and height.
Modifier	`Modifier.size(width: Dp, height: Dp)` Declare the size of the content to be exactly widthdp and heightdp.
Modifier	`Modifier.sizeIn(constraints: DpConstraints)` Constrain the size of the content to be within constraints.
Modifier	`Modifier.sizeIn(minWidth: Dp = Dp.Unspecified, minHeight: Dp = Dp.Unspecified, maxWidth: Dp = Dp.Unspecified, maxHeight: Dp = Dp.Unspecified)` Constrain the width of the content to be between minWidthdp and maxWidthdp, and the height of the content to be between minHeightdp and maxHeightdp.
Modifier	`Modifier.width(width: Dp)` Declare the width of the content to be exactly widthdp.
Modifier	`Modifier.widthIn(min: Dp = Dp.Unspecified, max: Dp = Dp.Unspecified)` Constrain the width of the content to be between mindp and maxdp.
Modifier	`Modifier.wrapContentHeight(align: Alignment.Vertical = Alignment.CenterVertically)` Allow the content to measure at its desired height without regard for the incoming measurement minimum height constraint.
Modifier	`Modifier.wrapContentSize(align: Alignment = Alignment.Center)` Allow the content to measure at its desired size without regard for the incoming measurement minimum width or minimum height constraints.
Modifier	`Modifier.wrapContentWidth(align: Alignment.Horizontal = Alignment.CenterHorizontally)` Allow the content to measure at its desired width without regard for the incoming measurement minimum width constraint.

From androidx.compose.animation

Modifier

Modifier.animateContentSize(animSpec: AnimationSpec<IntSize> = spring(), clip: Boolean = true, endListener: (startSize: IntSize, endSize: IntSize) -> Unit = null)

This modifier animates its own size when its child modifier (or the child composable if it is already at the tail of the chain) changes size.

From androidx.compose.foundation

Modifier	`Modifier.background(color: Color, shape: Shape = RectangleShape)` Draws shape with a solid color behind the content.
Modifier	`Modifier.background(brush: Brush, shape: Shape = RectangleShape, @FloatRange(0.0, 1.0) alpha: Float = 1.0f)` Draws shape with brush behind the content.
Modifier	`Modifier.border(border: BorderStroke, shape: Shape = RectangleShape)` Modify element to add border with appearance specified with a border and a shape, pad the content by the BorderStroke.width and clip it.
Modifier	`Modifier.border(width: Dp, color: Color, shape: Shape = RectangleShape)` Returns a Modifier that adds border with appearance specified with width, color and a shape, pads the content by the width and clips it.
Modifier	`Modifier.border(width: Dp, brush: Brush, shape: Shape)` Returns a Modifier that adds border with appearance specified with width, brush and a shape, pads the content by the width and clips it.
Modifier	`Modifier.clickable(enabled: Boolean = true, onClickLabel: String? = null, interactionState: InteractionState = remember { InteractionState() }, indication: Indication? = IndicationAmbient.current(), onLongClick: () -> Unit = null, onDoubleClick: () -> Unit = null, onClick: () -> Unit)` Configure component to receive clicks via input or accessibility "click" event.
Modifier	`Modifier.drawBorder(border: Border, shape: Shape = RectangleShape)` Returns a Modifier that adds border with appearance specified with a border and a shape
Modifier	`Modifier.drawBorder(size: Dp, color: Color, shape: Shape = RectangleShape)` Returns a Modifier that adds border with appearance specified with size, color and a shape
Modifier	`Modifier.drawBorder(size: Dp, brush: Brush, shape: Shape)` Returns a Modifier that adds border with appearance specified with size, brush and a shape
Modifier	`Modifier.horizontalScroll(state: ScrollState, enabled: Boolean = true, reverseScrolling: Boolean = false)` Modify element to allow to scroll horizontally when width of the content is bigger than max constraints allow.
Modifier	`Modifier.indication(interactionState: InteractionState, indication: Indication? = null)` Show visual indicator for an InteractionState.
Modifier	`Modifier.progressSemantics(@FloatRange(0.0, 1.0) progress: Float)` Contains the semantics required for a determinate progress indicator, that represents progress ranging from 0.
Modifier	`Modifier.progressSemantics()` Contains the semantics required for an indeterminate progress indicator, that represents the fact of the in-progress operation.
Modifier	`Modifier.verticalScroll(state: ScrollState, enabled: Boolean = true, reverseScrolling: Boolean = false)` Modify element to allow to scroll vertically when height of the content is bigger than max constraints allow.

From androidx.compose.ui.draw

Modifier	`Modifier.clip(shape: Shape)` Clip the content to shape.
Modifier	`Modifier.clipToBounds()` Clip the content to the bounds of a layer defined at this modifier.
Modifier	`Modifier.drawOpacity(@FloatRange(0.0, 1.0) opacity: Float)` Draw content with modified opacity (alpha) that may be less than 1.
Modifier	`Modifier.drawShadow(elevation: Dp, shape: Shape = RectangleShape, clip: Boolean = elevation > 0.dp, @FloatRange(0.0, 1.0) opacity: Float = 1f)` Creates a DrawLayerModifier that draws the shadow.
Modifier	`Modifier.paint(painter: Painter, sizeToIntrinsics: Boolean = true, alignment: Alignment = Alignment.Center, contentScale: ContentScale = ContentScale.Inside, alpha: Float = DefaultAlpha, colorFilter: ColorFilter? = null)` Paint the content using painter.

From androidx.compose.ui

Modifier	`Modifier.composed(factory: Modifier.() -> Modifier)` Declare a just-in-time composition of a Modifier that will be composed for each element it modifies.
Modifier	`Modifier.drawBehind(onDraw: DrawScope.() -> Unit)` Draw into a Canvas behind the modified content.
Modifier	`Modifier.drawLayer(scaleX: Float = 1f, scaleY: Float = 1f, alpha: Float = 1f, translationX: Float = 0f, translationY: Float = 0f, shadowElevation: Float = 0f, rotationX: Float = 0f, rotationY: Float = 0f, rotationZ: Float = 0f, transformOrigin: TransformOrigin = TransformOrigin.Center, shape: Shape = RectangleShape, clip: Boolean = false)` Draw the content into a layer.
Modifier	`Modifier.drawWithContent(onDraw: ContentDrawScope.() -> Unit)` Creates a DrawModifier that allows the developer to draw before or after the layout's contents.
Modifier	`Modifier.focus()` Add this modifier to a component to make it focusable.
Modifier	`Modifier.focusObserver(onFocusChange: (FocusState) -> Unit)` Add this modifier to a component to observe focus state changes.
Modifier	`Modifier.focusRequester(focusRequester: FocusRequester)` Add this modifier to a component to observe changes to focus state.
Modifier	`Modifier.layout(measure: MeasureScope.(Measurable, Constraints) -> MeasureScope.MeasureResult)` Creates a LayoutModifier that allows changing how the wrapped element is measured and laid out.
Modifier	`Modifier.onPositioned(onPositioned: (LayoutCoordinates) -> Unit)` Invoke onPositioned with the LayoutCoordinates of the element after positioning.
Modifier	`Modifier.zIndex(zIndex: Float)` Creates a ZIndexModifier that controls the drawing order for the children of the same layout parent.

From androidx.compose.ui.gesture

Modifier	`Modifier.doubleTapGestureFilter(onDoubleTap: (Offset) -> Unit)` Responds to pointers going down and up (tap) and then down and up again (another tap) with minimal gap of time between the first up and the second down.
Modifier	`Modifier.dragGestureFilter(dragObserver: DragObserver, canDrag: (Direction) -> Boolean = null, startDragImmediately: Boolean = false)` This gesture detector detects dragging in any direction.
Modifier	`Modifier.dragSlopExceededGestureFilter(onDragSlopExceeded: () -> Unit, canDrag: (Direction) -> Boolean = null, orientation: Orientation? = null)` This gesture filter detects when the average distance change of all pointers surpasses the touch slop.
Modifier	`Modifier.longPressDragGestureFilter(longPressDragObserver: LongPressDragObserver)` This gesture detector detects dragging in any direction, but only after a long press has first occurred.
Modifier	`Modifier.longPressGestureFilter(onLongPress: (Offset) -> Unit)` Responds to a pointer being "down" for an extended amount of time.
Modifier	`Modifier.pressIndicatorGestureFilter(onStart: (Offset) -> Unit = null, onStop: () -> Unit = null, onCancel: () -> Unit = null, enabled: Boolean = true)` This gesture detector has callbacks for when a press gesture starts and ends for the purposes of displaying visual feedback for those two states.
Modifier	`Modifier.rawDragGestureFilter(dragObserver: DragObserver, canStartDragging: () -> Boolean = null, orientation: Orientation? = null)` This gesture detector detects dragging in any direction.
Modifier	`Modifier.rawPressStartGestureFilter(onPressStart: (Offset) -> Unit, enabled: Boolean = false, executionPass: PointerEventPass = PointerEventPass.Main)` Reacts if the first pointer input change it sees is an unconsumed down change, and if it reacts, consumes all further down changes.
Modifier	`Modifier.rawScaleGestureFilter(scaleObserver: RawScaleObserver, canStartScaling: () -> Boolean = null)` This gesture detector detects scaling.
Modifier	`Modifier.scaleGestureFilter(scaleObserver: ScaleObserver)` This gesture detector detects scaling.
Modifier	`Modifier.scaleSlopExceededGestureFilter(onScaleSlopExceeded: () -> Unit)` This gesture detector detects when a user's pointer input is intended to include scaling.
Modifier	`Modifier.scrollGestureFilter(scrollCallback: ScrollCallback, orientation: Orientation, canDrag: (Direction) -> Boolean = null, startDragImmediately: Boolean = false)` Like Modifier.dragGestureFilter, this gesture filter will detect dragging, but will only do so along the given orientation.
Modifier	`Modifier.tapGestureFilter(onTap: (Offset) -> Unit)` This gesture detector fires a callback when a traditional press is being released.

From androidx.compose.foundation.gestures

Modifier	`Modifier.draggable(orientation: Orientation, enabled: Boolean = true, reverseDirection: Boolean = false, interactionState: InteractionState? = null, startDragImmediately: Boolean = false, canDrag: (Direction) -> Boolean = { enabled }, onDragStarted: (startedPosition: Offset) -> Unit = {}, onDragStopped: (velocity: Float) -> Unit = {}, onDrag: Density.(Float) -> Unit)` Configure touch dragging for the UI element in a single Orientation.
Modifier	`Modifier.scrollable(orientation: Orientation, controller: ScrollableController, enabled: Boolean = true, reverseDirection: Boolean = false, canScroll: (Direction) -> Boolean = { enabled }, onScrollStarted: (startedPosition: Offset) -> Unit = {}, onScrollStopped: (velocity: Float) -> Unit = {})` Configure touch scrolling and flinging for the UI element in a single Orientation.
Modifier	`Modifier.zoomable(controller: ZoomableController, enabled: Boolean = true, onZoomStarted: () -> Unit = null, onZoomStopped: () -> Unit = null)` Enable zooming of the modified UI element.
Modifier	`Modifier.zoomable(enabled: Boolean = true, onZoomStarted: () -> Unit = null, onZoomStopped: () -> Unit = null, onZoomDelta: (Float) -> Unit)` Enable zooming of the modified UI element.

From androidx.compose.ui.input.key

Modifier	`Modifier.keyInputFilter(onKeyEvent: (KeyEvent) -> Boolean)` Adding this modifier to the modifier parameter of a component will allow it to intercept hardware key events.
Modifier	`Modifier.previewKeyInputFilter(onPreviewKeyEvent: (KeyEvent) -> Boolean)` Adding this modifier to the modifier parameter of a component will allow it to intercept hardware key events.

From androidx.compose.ui.layout

Modifier

Modifier.layoutId(id: Any)

Tag the element with id to identify the element within its parent.

From androidx.compose.ui.input.pointer

Modifier

Modifier.pointerInteropFilter(requestDisallowInterceptTouchEvent: RequestDisallowInterceptTouchEvent? = null, onTouchEvent: (MotionEvent) -> Boolean)

A special PointerInputModifier that provides access to the underlying MotionEvents originally dispatched to Compose.

From androidx.compose.foundation.selection

Modifier	`Modifier.selectable(selected: Boolean, enabled: Boolean = true, inMutuallyExclusiveGroup: Boolean = true, interactionState: InteractionState = remember { InteractionState() }, indication: Indication? = IndicationAmbient.current(), onClick: () -> Unit)` Configure component to be selectable, usually as a part of a mutually exclusive group, where only one item can be selected at any point in time.
Modifier	`Modifier.toggleable(value: Boolean, enabled: Boolean = true, interactionState: InteractionState = remember { InteractionState() }, indication: Indication? = IndicationAmbient.current(), onValueChange: (Boolean) -> Unit)` Configure component to make it toggleable via input and accessibility events
Modifier	`Modifier.triStateToggleable(state: ToggleableState, enabled: Boolean = true, interactionState: InteractionState = remember { InteractionState() }, indication: Indication? = IndicationAmbient.current(), onClick: () -> Unit)` Configure component to make it toggleable via input and accessibility events with three states: On, Off and Indeterminate.

From androidx.compose.ui.semantics

Modifier

Modifier.semantics(mergeAllDescendants: Boolean = false, properties: SemanticsPropertyReceiver.() -> Unit)

Add semantics key/value for use in testing, accessibility, and similar use cases.

From androidx.compose.material

Modifier

Modifier.swipeable(state: SwipeableState<T>, anchors: Map<Float, T>, thresholds: (from: T, to: T) -> ThresholdConfig, orientation: Orientation, enabled: Boolean = true, reverseDirection: Boolean = false, interactionState: InteractionState? = null, resistance: ResistanceConfig? = defaultResistanceConfig(anchors.keys), velocityThreshold: Dp = DefaultVelocityThreshold)

Enable swipe gestures between a set of predefined states.

From androidx.compose.ui.platform

Modifier

Modifier.testTag(tag: String)

Applies a tag to allow modified element to be found in tests.

Properties
abstract (FocusState) -> Unit	`onFocusChange` A callback that is called whenever focus state changes.

Properties

onFocusChange

abstract val onFocusChange: (FocusState) -> Unit

A callback that is called whenever focus state changes.