| /* |
| * Copyright 2023 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.foundation.text2.input.internal |
| |
| import androidx.compose.ui.Modifier |
| import androidx.compose.ui.layout.FirstBaseline |
| import androidx.compose.ui.layout.LastBaseline |
| import androidx.compose.ui.layout.LayoutCoordinates |
| import androidx.compose.ui.layout.Measurable |
| import androidx.compose.ui.layout.MeasureResult |
| import androidx.compose.ui.layout.MeasureScope |
| import androidx.compose.ui.node.CompositionLocalConsumerModifierNode |
| import androidx.compose.ui.node.GlobalPositionAwareModifierNode |
| import androidx.compose.ui.node.LayoutModifierNode |
| import androidx.compose.ui.node.ModifierNodeElement |
| import androidx.compose.ui.node.currentValueOf |
| import androidx.compose.ui.platform.InspectorInfo |
| import androidx.compose.ui.platform.LocalFontFamilyResolver |
| import androidx.compose.ui.text.TextLayoutResult |
| import androidx.compose.ui.text.TextStyle |
| import androidx.compose.ui.unit.Constraints |
| import androidx.compose.ui.unit.Density |
| import kotlin.math.roundToInt |
| |
| /** |
| * This ModifierNodeElement is only responsible for laying out text and reporting its global |
| * position coordinates. Text layout is kept in a separate node than the rest of the Core modifiers |
| * because it will also go through scroll and minSize constraints. We need to know exact size and |
| * coordinates of [TextLayoutResult] to make it relatively easier to calculate the offset between |
| * exact touch coordinates and where they map on the [TextLayoutResult]. |
| */ |
| internal data class TextFieldTextLayoutModifier( |
| private val textLayoutState: TextLayoutState, |
| private val textFieldState: TransformedTextFieldState, |
| private val textStyle: TextStyle, |
| private val singleLine: Boolean, |
| private val onTextLayout: Density.(getResult: () -> TextLayoutResult?) -> Unit |
| ) : ModifierNodeElement<TextFieldTextLayoutModifierNode>() { |
| override fun create(): TextFieldTextLayoutModifierNode = TextFieldTextLayoutModifierNode( |
| textLayoutState = textLayoutState, |
| textFieldState = textFieldState, |
| textStyle = textStyle, |
| singleLine = singleLine, |
| onTextLayout = onTextLayout |
| ) |
| |
| override fun update(node: TextFieldTextLayoutModifierNode) { |
| node.updateNode( |
| textLayoutState = textLayoutState, |
| textFieldState = textFieldState, |
| textStyle = textStyle, |
| singleLine = singleLine, |
| onTextLayout = onTextLayout |
| ) |
| } |
| |
| override fun InspectorInfo.inspectableProperties() { |
| // no inspector info |
| } |
| } |
| |
| internal class TextFieldTextLayoutModifierNode( |
| private var textLayoutState: TextLayoutState, |
| textFieldState: TransformedTextFieldState, |
| textStyle: TextStyle, |
| singleLine: Boolean, |
| onTextLayout: Density.(getResult: () -> TextLayoutResult?) -> Unit |
| ) : Modifier.Node(), |
| LayoutModifierNode, |
| GlobalPositionAwareModifierNode, |
| CompositionLocalConsumerModifierNode { |
| |
| init { |
| textLayoutState.onTextLayout = onTextLayout |
| textLayoutState.updateNonMeasureInputs( |
| textFieldState = textFieldState, |
| textStyle = textStyle, |
| singleLine = singleLine, |
| softWrap = !singleLine |
| ) |
| } |
| |
| /** |
| * Updates all the related properties and invalidates internal state based on the changes. |
| */ |
| fun updateNode( |
| textLayoutState: TextLayoutState, |
| textFieldState: TransformedTextFieldState, |
| textStyle: TextStyle, |
| singleLine: Boolean, |
| onTextLayout: Density.(getResult: () -> TextLayoutResult?) -> Unit |
| ) { |
| this.textLayoutState = textLayoutState |
| this.textLayoutState.onTextLayout = onTextLayout |
| this.textLayoutState.updateNonMeasureInputs( |
| textFieldState = textFieldState, |
| textStyle = textStyle, |
| singleLine = singleLine, |
| softWrap = !singleLine |
| ) |
| } |
| |
| override fun onGloballyPositioned(coordinates: LayoutCoordinates) { |
| this.textLayoutState.textLayoutNodeCoordinates = coordinates |
| } |
| |
| override fun MeasureScope.measure( |
| measurable: Measurable, |
| constraints: Constraints |
| ): MeasureResult { |
| val result = textLayoutState.layoutWithNewMeasureInputs( |
| density = this, |
| layoutDirection = layoutDirection, |
| fontFamilyResolver = currentValueOf(LocalFontFamilyResolver), |
| constraints = constraints, |
| ) |
| |
| val placeable = measurable.measure( |
| Constraints.fixed(result.size.width, result.size.height) |
| ) |
| |
| // TODO: min height |
| |
| return layout( |
| width = result.size.width, |
| height = result.size.height, |
| alignmentLines = mapOf( |
| FirstBaseline to result.firstBaseline.roundToInt(), |
| LastBaseline to result.lastBaseline.roundToInt() |
| ) |
| ) { |
| placeable.place(0, 0) |
| } |
| } |
| } |
