| /* |
| * 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.ui.foundation |
| |
| import androidx.compose.Composable |
| import androidx.compose.Immutable |
| import androidx.compose.Stable |
| import androidx.compose.getValue |
| import androidx.compose.mutableStateOf |
| import androidx.compose.remember |
| import androidx.compose.setValue |
| import androidx.compose.state |
| import androidx.ui.core.Modifier |
| import androidx.ui.core.drawBehind |
| import androidx.ui.core.focus.FocusModifier |
| import androidx.ui.geometry.Offset |
| import androidx.ui.geometry.Rect |
| import androidx.ui.graphics.Color |
| import androidx.ui.graphics.drawscope.Stroke |
| import androidx.ui.graphics.useOrElse |
| import androidx.ui.input.EditorValue |
| import androidx.ui.input.ImeAction |
| import androidx.ui.input.KeyboardType |
| import androidx.ui.input.TransformedText |
| import androidx.ui.input.VisualTransformation |
| import androidx.ui.layout.defaultMinSizeConstraints |
| import androidx.ui.savedinstancestate.Saver |
| import androidx.ui.savedinstancestate.listSaver |
| import androidx.ui.text.CoreTextField |
| import androidx.ui.text.AnnotatedString |
| import androidx.ui.text.SoftwareKeyboardController |
| import androidx.ui.text.TextFieldDelegate |
| import androidx.ui.text.TextLayoutResult |
| import androidx.ui.text.TextRange |
| import androidx.ui.text.TextStyle |
| import androidx.ui.unit.dp |
| |
| /** |
| * A class holding information about the editing state. |
| * |
| * The input service updates text selection or cursor as well as text. You can observe and |
| * control the selection, cursor and text altogether. |
| * |
| * @param text the text will be rendered |
| * @param selection the selection range. If the selection is collapsed, it represents cursor |
| * location. Do not specify outside of the text buffer. |
| */ |
| @Immutable |
| data class TextFieldValue( |
| @Stable |
| val text: String = "", |
| @Stable |
| val selection: TextRange = TextRange(0, 0) |
| ) { |
| companion object { |
| /** |
| * The default [Saver] implementation for [TextFieldValue]. |
| */ |
| val Saver = listSaver<TextFieldValue, Any>( |
| save = { |
| listOf(it.text, it.selection.start, it.selection.end) |
| }, |
| restore = { |
| TextFieldValue(it[0] as String, TextRange(it[1] as Int, it[2] as Int)) |
| } |
| ) |
| } |
| } |
| |
| /** |
| * A user interface element for entering and modifying text. |
| * |
| * The TextField component renders an input and additional decorations set by input service |
| * which is software keyboard in Android. Once input service modify the text, you will get callback |
| * [onValueChange] with new text. Then, you can set this new text so that this component renders |
| * up-to-date text from input service. |
| * |
| * Example usage: |
| * @sample androidx.ui.foundation.samples.TextFieldSample |
| * |
| * Note: Please be careful if you setting model other than the one passed to [onValueChange] |
| * callback including selection or cursor. Especially, it is not recommended to modify the model |
| * passed to [onValueChange] callback. Any change to text, selection or cursor may be translated to |
| * full context reset by input service and end up with input session restart. This will be visible |
| * to users, for example, any ongoing composition text will be cleared or committed, then software |
| * keyboard may go back to the default one. |
| * |
| * @param value The [TextFieldValue] to be shown in the [TextField]. |
| * @param onValueChange Called when the input service updates the text, selection or cursor. When |
| * the input service update the text, selection or cursor, this callback is called with the updated |
| * [TextFieldValue]. If you want to observe the composition text, use [TextField] with |
| * compositionRange instead. |
| * @param modifier optional [Modifier] for this text field. |
| * @param textColor [Color] to apply to the text. If [Color.Unset], and [textStyle] has no color |
| * set, this will be [contentColor]. |
| * @param textStyle Style configuration that applies at character level such as color, font etc. |
| * @param keyboardType The keyboard type to be used in this text field. Note that this input type |
| * is honored by IME and shows corresponding keyboard but this is not guaranteed. For example, |
| * some IME may send non-ASCII character even if you set [KeyboardType.Ascii]. |
| * @param imeAction The IME action. This IME action is honored by IME and may show specific icons |
| * on the keyboard. For example, search icon may be shown if [ImeAction.Search] is specified. |
| * Then, when user tap that key, the [onImeActionPerformed] callback is called with specified |
| * ImeAction. |
| * @param onFocusChange Called with true value when the input field gains focus and with false |
| * value when the input field loses focus. Use [FocusModifier.requestFocus] to obtain text input |
| * focus to this TextField. |
| * @param onImeActionPerformed Called when the input service requested an IME action. When the |
| * input service emitted an IME action, this callback is called with the emitted IME action. Note |
| * that this IME action may be different from what you specified in [imeAction]. |
| * @param visualTransformation The visual transformation filter for changing the visual |
| * representation of the input. By default no visual transformation is applied. |
| * @param onTextLayout Callback that is executed when a new text layout is calculated. |
| * @param onTextInputStarted Callback that is executed when the initialization has done for |
| * communicating with platform text input service, e.g. software keyboard on Android. Called with |
| * [SoftwareKeyboardController] instance which can be used for requesting input show/hide software |
| * keyboard. |
| * @param cursorColor Color of the cursor. |
| * |
| * @see TextFieldValue |
| * @see ImeAction |
| * @see KeyboardType |
| * @see VisualTransformation |
| */ |
| @Composable |
| fun TextField( |
| value: TextFieldValue, |
| onValueChange: (TextFieldValue) -> Unit, |
| modifier: Modifier = Modifier, |
| textColor: Color = Color.Unset, |
| textStyle: TextStyle = currentTextStyle(), |
| keyboardType: KeyboardType = KeyboardType.Text, |
| imeAction: ImeAction = ImeAction.Unspecified, |
| onFocusChange: (Boolean) -> Unit = {}, |
| onImeActionPerformed: (ImeAction) -> Unit = {}, |
| visualTransformation: VisualTransformation = VisualTransformation.None, |
| onTextLayout: (TextLayoutResult) -> Unit = {}, |
| onTextInputStarted: (SoftwareKeyboardController) -> Unit = {}, |
| cursorColor: Color = contentColor() |
| ) { |
| val fullModel = state { EditorValue() } |
| if (fullModel.value.text != value.text || fullModel.value.selection != value.selection) { |
| val newSelection = TextRange( |
| value.selection.start.coerceIn(0, value.text.length), |
| value.selection.end.coerceIn(0, value.text.length) |
| ) |
| fullModel.value = EditorValue( |
| text = value.text, |
| selection = newSelection |
| ) |
| } |
| |
| val color = textColor.useOrElse { textStyle.color.useOrElse { contentColor() } } |
| val mergedStyle = textStyle.merge(TextStyle(color = color)) |
| |
| val transformedText: TransformedText = remember(fullModel.value, visualTransformation) { |
| val transformed = visualTransformation.filter(AnnotatedString(fullModel.value.text)) |
| fullModel.value.composition?.let { |
| TextFieldDelegate.applyCompositionDecoration(it, transformed) |
| } ?: transformed |
| } |
| val cursorState: CursorState = remember { CursorState() } |
| |
| CoreTextField( |
| value = fullModel.value, |
| modifier = modifier |
| .defaultMinSizeConstraints(minWidth = DefaultTextFieldWidth) |
| .drawCursor(cursorColor, cursorState, fullModel.value, transformedText), |
| onValueChange = { |
| val prevState = fullModel.value |
| fullModel.value = it |
| if (prevState.text != it.text || prevState.selection != it.selection) { |
| onValueChange( |
| TextFieldValue( |
| it.text, |
| it.selection |
| ) |
| ) |
| } |
| }, |
| textStyle = mergedStyle, |
| keyboardType = keyboardType, |
| imeAction = imeAction, |
| onFocusChange = { |
| cursorState.focused = it |
| onFocusChange(it) |
| }, |
| onImeActionPerformed = onImeActionPerformed, |
| visualTransformation = visualTransformation, |
| onTextLayout = { |
| cursorState.layoutResult = it |
| onTextLayout(it) |
| }, |
| onTextInputStarted = onTextInputStarted |
| ) |
| } |
| |
| private class CursorState { |
| var focused by mutableStateOf(false) |
| var layoutResult by mutableStateOf<TextLayoutResult?>(null) |
| } |
| |
| private val CursorThickness = 2.dp |
| |
| private fun Modifier.drawCursor( |
| cursorColor: Color, |
| cursorState: CursorState, |
| editorValue: EditorValue, |
| transformedText: TransformedText |
| ): Modifier = |
| drawBehind { |
| if (cursorState.focused && editorValue.selection.collapsed) { |
| val cursorWidth = CursorThickness.value * density |
| val cursorHeight = cursorState.layoutResult?.size?.height?.value?.toFloat() ?: 0f |
| |
| val cursorRect = cursorState.layoutResult?.getCursorRect( |
| transformedText.offsetMap.originalToTransformed(editorValue.selection.min) |
| ) ?: Rect( |
| 0f, 0f, |
| cursorWidth, cursorHeight |
| ) |
| val cursorX = (cursorRect.left + cursorRect.right) / 2 |
| |
| drawLine( |
| cursorColor, |
| Offset(cursorX, cursorRect.top), |
| Offset(cursorX, cursorRect.bottom), |
| stroke = Stroke(cursorWidth) |
| ) |
| } |
| } |
| |
| private val DefaultTextFieldWidth = 280.dp |