/*
* Copyright 2022 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package androidx.compose.material3
import androidx.compose.foundation.interaction.Interaction
import androidx.compose.foundation.interaction.MutableInteractionSource
import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.PaddingValues
import androidx.compose.foundation.layout.calculateEndPadding
import androidx.compose.foundation.layout.calculateStartPadding
import androidx.compose.foundation.layout.defaultMinSize
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.text.BasicTextField
import androidx.compose.foundation.text.KeyboardActions
import androidx.compose.foundation.text.KeyboardOptions
import androidx.compose.foundation.text.selection.LocalTextSelectionColors
import androidx.compose.runtime.Composable
import androidx.compose.runtime.CompositionLocalProvider
import androidx.compose.runtime.remember
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.draw.drawWithContent
import androidx.compose.ui.geometry.Size
import androidx.compose.ui.graphics.ClipOp
import androidx.compose.ui.graphics.Shape
import androidx.compose.ui.graphics.SolidColor
import androidx.compose.ui.graphics.drawscope.clipRect
import androidx.compose.ui.graphics.takeOrElse
import androidx.compose.ui.layout.IntrinsicMeasurable
import androidx.compose.ui.layout.IntrinsicMeasureScope
import androidx.compose.ui.layout.Layout
import androidx.compose.ui.layout.Measurable
import androidx.compose.ui.layout.MeasurePolicy
import androidx.compose.ui.layout.MeasureResult
import androidx.compose.ui.layout.MeasureScope
import androidx.compose.ui.layout.Placeable
import androidx.compose.ui.layout.layoutId
import androidx.compose.ui.platform.LocalLayoutDirection
import androidx.compose.ui.semantics.semantics
import androidx.compose.ui.text.TextStyle
import androidx.compose.ui.text.input.ImeAction
import androidx.compose.ui.text.input.KeyboardType
import androidx.compose.ui.text.input.TextFieldValue
import androidx.compose.ui.text.input.VisualTransformation
import androidx.compose.ui.unit.Constraints
import androidx.compose.ui.unit.IntOffset
import androidx.compose.ui.unit.LayoutDirection
import androidx.compose.ui.unit.coerceAtLeast
import androidx.compose.ui.unit.dp
import androidx.compose.ui.unit.offset
import kotlin.math.max
import kotlin.math.roundToInt
/**
* Material Design outlined text field.
*
* Text fields allow users to enter text into a UI. They typically appear in forms and dialogs.
* Outlined text fields have less visual emphasis than filled text fields. When they appear in
* places like forms, where many text fields are placed together, their reduced emphasis helps
* simplify the layout.
*
* 
*
* See example usage:
* @sample androidx.compose.material3.samples.SimpleOutlinedTextFieldSample
*
* If apart from input text change you also want to observe the cursor location, selection range,
* or IME composition use the OutlinedTextField overload with the [TextFieldValue] parameter
* instead.
*
* @param value the input text to be shown in the text field
* @param onValueChange the callback that is triggered when the input service updates the text. An
* updated text comes as a parameter of the callback
* @param modifier the [Modifier] to be applied to this text field
* @param enabled controls the enabled state of this text field. When `false`, this component will
* not respond to user input, and it will appear visually disabled and disabled to accessibility
* services.
* @param readOnly controls the editable state of the text field. When `true`, the text field cannot
* be modified. However, a user can focus it and copy text from it. Read-only text fields are
* usually used to display pre-filled forms that a user cannot edit.
* @param textStyle the style to be applied to the input text. Defaults to [LocalTextStyle].
* @param label the optional label to be displayed inside the text field container. The default
* text style for internal [Text] is [Typography.bodySmall] when the text field is in focus and
* [Typography.bodyLarge] when the text field is not in focus
* @param placeholder the optional placeholder to be displayed when the text field is in focus and
* the input text is empty. The default text style for internal [Text] is [Typography.bodyLarge]
* @param leadingIcon the optional leading icon to be displayed at the beginning of the text field
* container
* @param trailingIcon the optional trailing icon to be displayed at the end of the text field
* container
* @param supportingText the optional supporting text to be displayed below the text field
* @param isError indicates if the text field's current value is in error. If set to true, the
* label, bottom indicator and trailing icon by default will be displayed in error color
* @param visualTransformation transforms the visual representation of the input [value]
* For example, you can use
* [PasswordVisualTransformation][androidx.compose.ui.text.input.PasswordVisualTransformation] to
* create a password text field. By default, no visual transformation is applied.
* @param keyboardOptions software keyboard options that contains configuration such as
* [KeyboardType] and [ImeAction]
* @param keyboardActions when the input service emits an IME action, the corresponding callback
* is called. Note that this IME action may be different from what you specified in
* [KeyboardOptions.imeAction]
* @param singleLine when `true`, this text field becomes a single horizontally scrolling text field
* instead of wrapping onto multiple lines. The keyboard will be informed to not show the return key
* as the [ImeAction]. Note that [maxLines] parameter will be ignored as the maxLines attribute will
* be automatically set to 1.
* @param maxLines the maximum height in terms of maximum number of visible lines. It is required
* that 1 <= [minLines] <= [maxLines]. This parameter is ignored when [singleLine] is true.
* @param minLines the minimum height in terms of minimum number of visible lines. It is required
* that 1 <= [minLines] <= [maxLines]. This parameter is ignored when [singleLine] is true.
* @param interactionSource the [MutableInteractionSource] representing the stream of [Interaction]s
* for this text field. You can create and pass in your own `remember`ed instance to observe
* [Interaction]s and customize the appearance / behavior of this text field in different states.
* @param shape defines the shape of this text field's border
* @param colors [TextFieldColors] that will be used to resolve the colors used for this text field
* in different states. See [TextFieldDefaults.outlinedTextFieldColors].
*/
@ExperimentalMaterial3Api
@Composable
fun OutlinedTextField(
value: String,
onValueChange: (String) -> Unit,
modifier: Modifier = Modifier,
enabled: Boolean = true,
readOnly: Boolean = false,
textStyle: TextStyle = LocalTextStyle.current,
label: @Composable (() -> Unit)? = null,
placeholder: @Composable (() -> Unit)? = null,
leadingIcon: @Composable (() -> Unit)? = null,
trailingIcon: @Composable (() -> Unit)? = null,
supportingText: @Composable (() -> Unit)? = null,
isError: Boolean = false,
visualTransformation: VisualTransformation = VisualTransformation.None,
keyboardOptions: KeyboardOptions = KeyboardOptions.Default,
keyboardActions: KeyboardActions = KeyboardActions.Default,
singleLine: Boolean = false,
maxLines: Int = if (singleLine) 1 else Int.MAX_VALUE,
minLines: Int = 1,
interactionSource: MutableInteractionSource = remember { MutableInteractionSource() },
shape: Shape = TextFieldDefaults.outlinedShape,
colors: TextFieldColors = TextFieldDefaults.outlinedTextFieldColors()
) {
// If color is not provided via the text style, use content color as a default
val textColor = textStyle.color.takeOrElse {
colors.textColor(enabled).value
}
val mergedTextStyle = textStyle.merge(TextStyle(color = textColor))
CompositionLocalProvider(LocalTextSelectionColors provides colors.selectionColors) {
@OptIn(ExperimentalMaterial3Api::class)
BasicTextField(
value = value,
modifier = if (label != null) {
modifier
// Merge semantics at the beginning of the modifier chain to ensure padding is
// considered part of the text field.
.semantics(mergeDescendants = true) {}
.padding(top = OutlinedTextFieldTopPadding)
} else {
modifier
}
.defaultMinSize(
minWidth = TextFieldDefaults.MinWidth,
minHeight = TextFieldDefaults.MinHeight
),
onValueChange = onValueChange,
enabled = enabled,
readOnly = readOnly,
textStyle = mergedTextStyle,
cursorBrush = SolidColor(colors.cursorColor(isError).value),
visualTransformation = visualTransformation,
keyboardOptions = keyboardOptions,
keyboardActions = keyboardActions,
interactionSource = interactionSource,
singleLine = singleLine,
maxLines = maxLines,
minLines = minLines,
decorationBox = @Composable { innerTextField ->
TextFieldDefaults.OutlinedTextFieldDecorationBox(
value = value,
visualTransformation = visualTransformation,
innerTextField = innerTextField,
placeholder = placeholder,
label = label,
leadingIcon = leadingIcon,
trailingIcon = trailingIcon,
supportingText = supportingText,
singleLine = singleLine,
enabled = enabled,
isError = isError,
interactionSource = interactionSource,
colors = colors,
container = {
TextFieldDefaults.OutlinedBorderContainerBox(
enabled,
isError,
interactionSource,
colors,
shape
)
}
)
}
)
}
}
/**
* Material Design outlined text field.
*
* Text fields allow users to enter text into a UI. They typically appear in forms and dialogs.
* Outlined text fields have less visual emphasis than filled text fields. When they appear in
* places like forms, where many text fields are placed together, their reduced emphasis helps
* simplify the layout.
*
* 
*
* See example usage:
* @sample androidx.compose.material3.samples.OutlinedTextFieldSample
*
* This overload provides access to the input text, cursor position and selection range and
* IME composition. If you only want to observe an input text change, use the OutlinedTextField
* overload with the [String] parameter instead.
*
* @param value the input [TextFieldValue] to be shown in the text field
* @param onValueChange the callback that is triggered when the input service updates values in
* [TextFieldValue]. An updated [TextFieldValue] comes as a parameter of the callback
* @param modifier the [Modifier] to be applied to this text field
* @param enabled controls the enabled state of this text field. When `false`, this component will
* not respond to user input, and it will appear visually disabled and disabled to accessibility
* services.
* @param readOnly controls the editable state of the text field. When `true`, the text field cannot
* be modified. However, a user can focus it and copy text from it. Read-only text fields are
* usually used to display pre-filled forms that a user cannot edit.
* @param textStyle the style to be applied to the input text. Defaults to [LocalTextStyle].
* @param label the optional label to be displayed inside the text field container. The default
* text style for internal [Text] is [Typography.bodySmall] when the text field is in focus and
* [Typography.bodyLarge] when the text field is not in focus
* @param placeholder the optional placeholder to be displayed when the text field is in focus and
* the input text is empty. The default text style for internal [Text] is [Typography.bodyLarge]
* @param leadingIcon the optional leading icon to be displayed at the beginning of the text field
* container
* @param trailingIcon the optional trailing icon to be displayed at the end of the text field
* container
* @param supportingText the optional supporting text to be displayed below the text field
* @param isError indicates if the text field's current value is in error state. If set to
* true, the label, bottom indicator and trailing icon by default will be displayed in error color
* @param visualTransformation transforms the visual representation of the input [value]
* For example, you can use
* [PasswordVisualTransformation][androidx.compose.ui.text.input.PasswordVisualTransformation] to
* create a password text field. By default, no visual transformation is applied.
* @param keyboardOptions software keyboard options that contains configuration such as
* [KeyboardType] and [ImeAction]
* @param keyboardActions when the input service emits an IME action, the corresponding callback
* is called. Note that this IME action may be different from what you specified in
* [KeyboardOptions.imeAction]
* @param singleLine when `true`, this text field becomes a single horizontally scrolling text field
* instead of wrapping onto multiple lines. The keyboard will be informed to not show the return key
* as the [ImeAction]. Note that [maxLines] parameter will be ignored as the maxLines attribute will
* be automatically set to 1.
* @param maxLines the maximum height in terms of maximum number of visible lines. It is required
* that 1 <= [minLines] <= [maxLines]. This parameter is ignored when [singleLine] is true.
* @param minLines the minimum height in terms of minimum number of visible lines. It is required
* that 1 <= [minLines] <= [maxLines]. This parameter is ignored when [singleLine] is true.
* @param interactionSource the [MutableInteractionSource] representing the stream of [Interaction]s
* for this text field. You can create and pass in your own `remember`ed instance to observe
* [Interaction]s and customize the appearance / behavior of this text field in different states.
* @param shape defines the shape of this text field's border
* @param colors [TextFieldColors] that will be used to resolve the colors used for this text field
* in different states. See [TextFieldDefaults.outlinedTextFieldColors].
*/
@ExperimentalMaterial3Api
@Composable
fun OutlinedTextField(
value: TextFieldValue,
onValueChange: (TextFieldValue) -> Unit,
modifier: Modifier = Modifier,
enabled: Boolean = true,
readOnly: Boolean = false,
textStyle: TextStyle = LocalTextStyle.current,
label: @Composable (() -> Unit)? = null,
placeholder: @Composable (() -> Unit)? = null,
leadingIcon: @Composable (() -> Unit)? = null,
trailingIcon: @Composable (() -> Unit)? = null,
supportingText: @Composable (() -> Unit)? = null,
isError: Boolean = false,
visualTransformation: VisualTransformation = VisualTransformation.None,
keyboardOptions: KeyboardOptions = KeyboardOptions.Default,
keyboardActions: KeyboardActions = KeyboardActions.Default,
singleLine: Boolean = false,
maxLines: Int = if (singleLine) 1 else Int.MAX_VALUE,
minLines: Int = 1,
interactionSource: MutableInteractionSource = remember { MutableInteractionSource() },
shape: Shape = TextFieldDefaults.outlinedShape,
colors: TextFieldColors = TextFieldDefaults.outlinedTextFieldColors()
) {
// If color is not provided via the text style, use content color as a default
val textColor = textStyle.color.takeOrElse {
colors.textColor(enabled).value
}
val mergedTextStyle = textStyle.merge(TextStyle(color = textColor))
CompositionLocalProvider(LocalTextSelectionColors provides colors.selectionColors) {
@OptIn(ExperimentalMaterial3Api::class)
BasicTextField(
value = value,
modifier = if (label != null) {
modifier
// Merge semantics at the beginning of the modifier chain to ensure padding is
// considered part of the text field.
.semantics(mergeDescendants = true) {}
.padding(top = OutlinedTextFieldTopPadding)
} else {
modifier
}
.defaultMinSize(
minWidth = TextFieldDefaults.MinWidth,
minHeight = TextFieldDefaults.MinHeight
),
onValueChange = onValueChange,
enabled = enabled,
readOnly = readOnly,
textStyle = mergedTextStyle,
cursorBrush = SolidColor(colors.cursorColor(isError).value),
visualTransformation = visualTransformation,
keyboardOptions = keyboardOptions,
keyboardActions = keyboardActions,
interactionSource = interactionSource,
singleLine = singleLine,
maxLines = maxLines,
minLines = minLines,
decorationBox = @Composable { innerTextField ->
TextFieldDefaults.OutlinedTextFieldDecorationBox(
value = value.text,
visualTransformation = visualTransformation,
innerTextField = innerTextField,
placeholder = placeholder,
label = label,
leadingIcon = leadingIcon,
trailingIcon = trailingIcon,
supportingText = supportingText,
singleLine = singleLine,
enabled = enabled,
isError = isError,
interactionSource = interactionSource,
colors = colors,
container = {
TextFieldDefaults.OutlinedBorderContainerBox(
enabled,
isError,
interactionSource,
colors,
shape
)
}
)
}
)
}
}
/**
* Layout of the leading and trailing icons and the text field, label and placeholder in
* [OutlinedTextField].
* It doesn't use Row to position the icons and middle part because label should not be
* positioned in the middle part.
*/
@Composable
@ExperimentalMaterial3Api
internal fun OutlinedTextFieldLayout(
modifier: Modifier,
textField: @Composable () -> Unit,
placeholder: @Composable ((Modifier) -> Unit)?,
label: @Composable (() -> Unit)?,
leading: @Composable (() -> Unit)?,
trailing: @Composable (() -> Unit)?,
singleLine: Boolean,
animationProgress: Float,
onLabelMeasured: (Size) -> Unit,
container: @Composable () -> Unit,
supporting: @Composable (() -> Unit)?,
paddingValues: PaddingValues
) {
val measurePolicy = remember(onLabelMeasured, singleLine, animationProgress, paddingValues) {
OutlinedTextFieldMeasurePolicy(
onLabelMeasured,
singleLine,
animationProgress,
paddingValues
)
}
val layoutDirection = LocalLayoutDirection.current
Layout(
modifier = modifier,
content = {
container()
if (leading != null) {
Box(
modifier = Modifier.layoutId(LeadingId).then(IconDefaultSizeModifier),
contentAlignment = Alignment.Center
) {
leading()
}
}
if (trailing != null) {
Box(
modifier = Modifier.layoutId(TrailingId).then(IconDefaultSizeModifier),
contentAlignment = Alignment.Center
) {
trailing()
}
}
val startTextFieldPadding = paddingValues.calculateStartPadding(layoutDirection)
val endTextFieldPadding = paddingValues.calculateEndPadding(layoutDirection)
val padding = Modifier.padding(
start = if (leading != null) {
(startTextFieldPadding - HorizontalIconPadding).coerceAtLeast(
0.dp
)
} else {
startTextFieldPadding
},
end = if (trailing != null) {
(endTextFieldPadding - HorizontalIconPadding).coerceAtLeast(0.dp)
} else {
endTextFieldPadding
}
)
if (placeholder != null) {
placeholder(Modifier.layoutId(PlaceholderId).then(padding))
}
Box(
modifier = Modifier.layoutId(TextFieldId).then(padding),
propagateMinConstraints = true
) {
textField()
}
if (label != null) {
Box(modifier = Modifier.layoutId(LabelId)) { label() }
}
if (supporting != null) {
Box(Modifier
.layoutId(SupportingId)
.padding(TextFieldDefaults.supportingTextPadding())
) { supporting() }
}
},
measurePolicy = measurePolicy
)
}
private class OutlinedTextFieldMeasurePolicy(
private val onLabelMeasured: (Size) -> Unit,
private val singleLine: Boolean,
private val animationProgress: Float,
private val paddingValues: PaddingValues
) : MeasurePolicy {
override fun MeasureScope.measure(
measurables: List,
constraints: Constraints
): MeasureResult {
var occupiedSpaceHorizontally = 0
var occupiedSpaceVertically = 0
val bottomPadding = paddingValues.calculateBottomPadding().roundToPx()
val relaxedConstraints = constraints.copy(minWidth = 0, minHeight = 0)
// measure leading icon
val leadingPlaceable = measurables.find {
it.layoutId == LeadingId
}?.measure(relaxedConstraints)
occupiedSpaceHorizontally += widthOrZero(
leadingPlaceable
)
occupiedSpaceVertically = max(occupiedSpaceVertically, heightOrZero(leadingPlaceable))
// measure trailing icon
val trailingPlaceable = measurables.find { it.layoutId == TrailingId }
?.measure(relaxedConstraints.offset(horizontal = -occupiedSpaceHorizontally))
occupiedSpaceHorizontally += widthOrZero(
trailingPlaceable
)
occupiedSpaceVertically = max(occupiedSpaceVertically, heightOrZero(trailingPlaceable))
// measure label
val isLabelInMiddleSection = animationProgress < 1f
val labelHorizontalPaddingOffset =
paddingValues.calculateLeftPadding(layoutDirection).roundToPx() +
paddingValues.calculateRightPadding(layoutDirection).roundToPx()
val labelConstraints = relaxedConstraints.offset(
horizontal = if (isLabelInMiddleSection) {
-occupiedSpaceHorizontally - labelHorizontalPaddingOffset
} else {
-labelHorizontalPaddingOffset
},
vertical = -bottomPadding
)
val labelPlaceable =
measurables.find { it.layoutId == LabelId }?.measure(labelConstraints)
labelPlaceable?.let {
onLabelMeasured(Size(it.width.toFloat(), it.height.toFloat()))
}
// measure text field
// On top, we offset either by default padding or by label's half height if its too big.
// On bottom, we offset to make room for supporting text.
// minHeight must not be set to 0 due to how foundation TextField treats zero minHeight.
val topPadding = max(
heightOrZero(labelPlaceable) / 2,
paddingValues.calculateTopPadding().roundToPx()
)
val textConstraints = constraints.offset(
horizontal = -occupiedSpaceHorizontally,
vertical = -bottomPadding - topPadding
).copy(minHeight = 0)
val textFieldPlaceable =
measurables.first { it.layoutId == TextFieldId }.measure(textConstraints)
// measure placeholder
val placeholderConstraints = textConstraints.copy(minWidth = 0)
val placeholderPlaceable =
measurables.find { it.layoutId == PlaceholderId }?.measure(placeholderConstraints)
occupiedSpaceVertically = max(
occupiedSpaceVertically,
max(heightOrZero(textFieldPlaceable), heightOrZero(placeholderPlaceable)) +
topPadding + bottomPadding
)
// measure supporting text
val supportingConstraints = relaxedConstraints.offset(
vertical = -occupiedSpaceVertically
).copy(minHeight = 0)
val supportingPlaceable =
measurables.find { it.layoutId == SupportingId }?.measure(supportingConstraints)
val supportingHeight = heightOrZero(supportingPlaceable)
val width =
calculateWidth(
leadingPlaceableWidth = widthOrZero(leadingPlaceable),
trailingPlaceableWidth = widthOrZero(trailingPlaceable),
textFieldPlaceableWidth = textFieldPlaceable.width,
labelPlaceableWidth = widthOrZero(labelPlaceable),
placeholderPlaceableWidth = widthOrZero(placeholderPlaceable),
isLabelInMiddleSection = isLabelInMiddleSection,
constraints = constraints,
density = density,
paddingValues = paddingValues,
)
val totalHeight =
calculateHeight(
heightOrZero(leadingPlaceable),
heightOrZero(trailingPlaceable),
textFieldPlaceable.height,
heightOrZero(labelPlaceable),
heightOrZero(placeholderPlaceable),
heightOrZero(supportingPlaceable),
constraints,
density,
paddingValues
)
val height = totalHeight - supportingHeight
val containerPlaceable = measurables.first { it.layoutId == ContainerId }.measure(
Constraints(
minWidth = if (width != Constraints.Infinity) width else 0,
maxWidth = width,
minHeight = if (height != Constraints.Infinity) height else 0,
maxHeight = height
)
)
return layout(width, totalHeight) {
place(
totalHeight,
width,
leadingPlaceable,
trailingPlaceable,
textFieldPlaceable,
labelPlaceable,
placeholderPlaceable,
containerPlaceable,
supportingPlaceable,
animationProgress,
singleLine,
density,
layoutDirection,
paddingValues
)
}
}
override fun IntrinsicMeasureScope.maxIntrinsicHeight(
measurables: List,
width: Int
): Int {
return intrinsicHeight(measurables, width) { intrinsicMeasurable, w ->
intrinsicMeasurable.maxIntrinsicHeight(w)
}
}
override fun IntrinsicMeasureScope.minIntrinsicHeight(
measurables: List,
width: Int
): Int {
return intrinsicHeight(measurables, width) { intrinsicMeasurable, w ->
intrinsicMeasurable.minIntrinsicHeight(w)
}
}
override fun IntrinsicMeasureScope.maxIntrinsicWidth(
measurables: List,
height: Int
): Int {
return intrinsicWidth(measurables, height) { intrinsicMeasurable, h ->
intrinsicMeasurable.maxIntrinsicWidth(h)
}
}
override fun IntrinsicMeasureScope.minIntrinsicWidth(
measurables: List,
height: Int
): Int {
return intrinsicWidth(measurables, height) { intrinsicMeasurable, h ->
intrinsicMeasurable.minIntrinsicWidth(h)
}
}
private fun IntrinsicMeasureScope.intrinsicWidth(
measurables: List,
height: Int,
intrinsicMeasurer: (IntrinsicMeasurable, Int) -> Int
): Int {
val textFieldWidth =
intrinsicMeasurer(measurables.first { it.layoutId == TextFieldId }, height)
val labelWidth = measurables.find { it.layoutId == LabelId }?.let {
intrinsicMeasurer(it, height)
} ?: 0
val trailingWidth = measurables.find { it.layoutId == TrailingId }?.let {
intrinsicMeasurer(it, height)
} ?: 0
val leadingWidth = measurables.find { it.layoutId == LeadingId }?.let {
intrinsicMeasurer(it, height)
} ?: 0
val placeholderWidth = measurables.find { it.layoutId == PlaceholderId }?.let {
intrinsicMeasurer(it, height)
} ?: 0
return calculateWidth(
leadingPlaceableWidth = leadingWidth,
trailingPlaceableWidth = trailingWidth,
textFieldPlaceableWidth = textFieldWidth,
labelPlaceableWidth = labelWidth,
placeholderPlaceableWidth = placeholderWidth,
isLabelInMiddleSection = animationProgress < 1f,
constraints = ZeroConstraints,
density = density,
paddingValues = paddingValues,
)
}
private fun IntrinsicMeasureScope.intrinsicHeight(
measurables: List,
width: Int,
intrinsicMeasurer: (IntrinsicMeasurable, Int) -> Int
): Int {
val textFieldHeight =
intrinsicMeasurer(measurables.first { it.layoutId == TextFieldId }, width)
val labelHeight = measurables.find { it.layoutId == LabelId }?.let {
intrinsicMeasurer(it, width)
} ?: 0
val trailingHeight = measurables.find { it.layoutId == TrailingId }?.let {
intrinsicMeasurer(it, width)
} ?: 0
val leadingHeight = measurables.find { it.layoutId == LeadingId }?.let {
intrinsicMeasurer(it, width)
} ?: 0
val placeholderHeight = measurables.find { it.layoutId == PlaceholderId }?.let {
intrinsicMeasurer(it, width)
} ?: 0
val supportingHeight = measurables.find { it.layoutId == SupportingId }?.let {
intrinsicMeasurer(it, width)
} ?: 0
return calculateHeight(
leadingPlaceableHeight = leadingHeight,
trailingPlaceableHeight = trailingHeight,
textFieldPlaceableHeight = textFieldHeight,
labelPlaceableHeight = labelHeight,
placeholderPlaceableHeight = placeholderHeight,
supportingPlaceableHeight = supportingHeight,
constraints = ZeroConstraints,
density = density,
paddingValues = paddingValues
)
}
}
/**
* Calculate the width of the [OutlinedTextField] given all elements that should be placed inside.
*/
private fun calculateWidth(
leadingPlaceableWidth: Int,
trailingPlaceableWidth: Int,
textFieldPlaceableWidth: Int,
labelPlaceableWidth: Int,
placeholderPlaceableWidth: Int,
isLabelInMiddleSection: Boolean,
constraints: Constraints,
density: Float,
paddingValues: PaddingValues,
): Int {
val middleSection = maxOf(
textFieldPlaceableWidth,
if (isLabelInMiddleSection) labelPlaceableWidth else 0,
placeholderPlaceableWidth
)
val wrappedWidth =
leadingPlaceableWidth + middleSection + trailingPlaceableWidth
val focusedLabelWidth =
if (!isLabelInMiddleSection) {
// Actual LayoutDirection doesn't matter; we only need the sum
val labelHorizontalPadding = (paddingValues.calculateLeftPadding(LayoutDirection.Ltr) +
paddingValues.calculateRightPadding(LayoutDirection.Ltr)).value * density
labelPlaceableWidth + labelHorizontalPadding.roundToInt()
} else {
0
}
return maxOf(wrappedWidth, focusedLabelWidth, constraints.minWidth)
}
/**
* Calculate the height of the [OutlinedTextField] given all elements that should be placed inside.
* This includes the supporting text, if it exists, even though this element is not "visually"
* inside the text field.
*/
private fun calculateHeight(
leadingPlaceableHeight: Int,
trailingPlaceableHeight: Int,
textFieldPlaceableHeight: Int,
labelPlaceableHeight: Int,
placeholderPlaceableHeight: Int,
supportingPlaceableHeight: Int,
constraints: Constraints,
density: Float,
paddingValues: PaddingValues
): Int {
// middle section is defined as a height of the text field or placeholder (whichever is
// taller) plus 16.dp or half height of the label if it is taller, given that the label
// is vertically centered to the top edge of the resulting text field's container
val inputFieldHeight = max(
textFieldPlaceableHeight,
placeholderPlaceableHeight
)
val topPadding = paddingValues.calculateTopPadding().value * density
val bottomPadding = paddingValues.calculateBottomPadding().value * density
val middleSectionHeight = inputFieldHeight + bottomPadding + max(
topPadding,
labelPlaceableHeight / 2f
)
return max(
constraints.minHeight,
maxOf(
leadingPlaceableHeight,
trailingPlaceableHeight,
middleSectionHeight.roundToInt()
) + supportingPlaceableHeight
)
}
/**
* Places the provided text field, placeholder, label, optional leading and trailing icons inside
* the [OutlinedTextField]
*/
private fun Placeable.PlacementScope.place(
totalHeight: Int,
width: Int,
leadingPlaceable: Placeable?,
trailingPlaceable: Placeable?,
textFieldPlaceable: Placeable,
labelPlaceable: Placeable?,
placeholderPlaceable: Placeable?,
containerPlaceable: Placeable,
supportingPlaceable: Placeable?,
animationProgress: Float,
singleLine: Boolean,
density: Float,
layoutDirection: LayoutDirection,
paddingValues: PaddingValues
) {
// place container
containerPlaceable.place(IntOffset.Zero)
// Most elements should be positioned w.r.t the text field's "visual" height, i.e., excluding
// the supporting text on bottom
val height = totalHeight - heightOrZero(supportingPlaceable)
val topPadding = (paddingValues.calculateTopPadding().value * density).roundToInt()
val startPadding =
(paddingValues.calculateStartPadding(layoutDirection).value * density).roundToInt()
val iconPadding = HorizontalIconPadding.value * density
// placed center vertically and to the start edge horizontally
leadingPlaceable?.placeRelative(
0,
Alignment.CenterVertically.align(leadingPlaceable.height, height)
)
// placed center vertically and to the end edge horizontally
trailingPlaceable?.placeRelative(
width - trailingPlaceable.width,
Alignment.CenterVertically.align(trailingPlaceable.height, height)
)
// label position is animated
// in single line text field label is centered vertically before animation starts
labelPlaceable?.let {
val startPositionY = if (singleLine) {
Alignment.CenterVertically.align(it.height, height)
} else {
topPadding
}
val positionY =
startPositionY * (1 - animationProgress) - (it.height / 2) * animationProgress
val positionX = (
if (leadingPlaceable == null) {
0f
} else {
(widthOrZero(leadingPlaceable) - iconPadding) * (1 - animationProgress)
}
).roundToInt() + startPadding
it.placeRelative(positionX, positionY.roundToInt())
}
// placed center vertically and after the leading icon horizontally if single line text field
// placed to the top with padding for multi line text field
val textVerticalPosition = max(
if (singleLine) {
Alignment.CenterVertically.align(textFieldPlaceable.height, height)
} else {
topPadding
},
heightOrZero(labelPlaceable) / 2
)
textFieldPlaceable.placeRelative(widthOrZero(leadingPlaceable), textVerticalPosition)
// placed similar to the input text above
placeholderPlaceable?.let {
val placeholderVerticalPosition = if (singleLine) {
Alignment.CenterVertically.align(it.height, height)
} else {
topPadding
}
it.placeRelative(widthOrZero(leadingPlaceable), placeholderVerticalPosition)
}
// place supporting text
supportingPlaceable?.placeRelative(0, height)
}
internal fun Modifier.outlineCutout(labelSize: Size, paddingValues: PaddingValues) =
this.drawWithContent {
val labelWidth = labelSize.width
if (labelWidth > 0f) {
val innerPadding = OutlinedTextFieldInnerPadding.toPx()
val leftLtr = paddingValues.calculateLeftPadding(layoutDirection).toPx() - innerPadding
val rightLtr = leftLtr + labelWidth + 2 * innerPadding
val left = when (layoutDirection) {
LayoutDirection.Rtl -> size.width - rightLtr
else -> leftLtr.coerceAtLeast(0f)
}
val right = when (layoutDirection) {
LayoutDirection.Rtl -> size.width - leftLtr.coerceAtLeast(0f)
else -> rightLtr
}
val labelHeight = labelSize.height
// using label height as a cutout area to make sure that no hairline artifacts are
// left when we clip the border
clipRect(left, -labelHeight / 2, right, labelHeight / 2, ClipOp.Difference) {
this@drawWithContent.drawContent()
}
} else {
this@drawWithContent.drawContent()
}
}
private val OutlinedTextFieldInnerPadding = 4.dp
/*
This padding is used to allow label not overlap with the content above it. This 8.dp will work
for default cases when developers do not override the label's font size. If they do, they will
need to add additional padding themselves
*/
/* @VisibleForTesting */
internal val OutlinedTextFieldTopPadding = 8.dp