TextFieldSize.kt
/*
* Copyright 2020 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.text
import androidx.compose.foundation.layout.defaultMinSize
import androidx.compose.runtime.remember
import androidx.compose.ui.Modifier
import androidx.compose.ui.composed
import androidx.compose.ui.layout.layout
import androidx.compose.ui.platform.LocalDensity
import androidx.compose.ui.platform.LocalFontLoader
import androidx.compose.ui.platform.LocalLayoutDirection
import androidx.compose.ui.text.TextStyle
import androidx.compose.ui.text.font.Font
import androidx.compose.ui.text.resolveDefaults
import androidx.compose.ui.unit.Density
import androidx.compose.ui.unit.IntSize
import androidx.compose.ui.unit.LayoutDirection
@Suppress("ModifierInspectorInfo")
internal fun Modifier.textFieldMinSize(style: TextStyle) = composed {
val density = LocalDensity.current
val resourceLoader = LocalFontLoader.current
val layoutDirection = LocalLayoutDirection.current
val minSizeState = remember { TextFieldSize(layoutDirection, density, resourceLoader, style) }
minSizeState.update(layoutDirection, density, resourceLoader, style)
Modifier.layout { measurable, constraints ->
Modifier.defaultMinSize()
val minSize = minSizeState.minSize
val childConstraints = constraints.copy(
minWidth = minSize.width.coerceIn(constraints.minWidth, constraints.maxWidth),
minHeight = minSize.height.coerceIn(constraints.minHeight, constraints.maxHeight)
)
val measured = measurable.measure(childConstraints)
layout(measured.width, measured.height) {
measured.placeRelative(0, 0)
}
}
}
private class TextFieldSize(
var layoutDirection: LayoutDirection,
var density: Density,
var resourceLoader: Font.ResourceLoader,
var style: TextStyle
) {
var minSize = computeMinSize()
private set
fun update(
layoutDirection: LayoutDirection,
density: Density,
resourceLoader: Font.ResourceLoader,
style: TextStyle
) {
if (layoutDirection != this.layoutDirection ||
density != this.density ||
resourceLoader != this.resourceLoader ||
style != this.style
) {
this.layoutDirection = layoutDirection
this.density = density
this.resourceLoader = resourceLoader
this.style = style
minSize = computeMinSize()
}
}
private fun computeMinSize(): IntSize {
return computeSizeForDefaultText(
style = resolveDefaults(style, layoutDirection),
density = density,
resourceLoader = resourceLoader
)
}
}