678 lines
23 KiB
Dart
678 lines
23 KiB
Dart
// Copyright 2014 The Flutter Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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// @dart = 2.8
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import 'package:flutter/cupertino.dart';
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import 'package:flutter/foundation.dart';
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import 'package:flutter/gestures.dart';
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import 'package:flutter/material.dart';
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import 'package:flutter/rendering.dart';
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import 'package:flutter/services.dart';
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import 'package:flutter/widgets.dart';
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//TODO: please let us delete this file
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/// An eyeballed value that moves the cursor slightly left of where it is
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/// rendered for text on Android so its positioning more accurately matches the
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/// native iOS text cursor positioning.
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///
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/// This value is in device pixels, not logical pixels as is typically used
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/// throughout the codebase.
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const int iOSHorizontalOffset = -2;
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class _TextSpanEditingController extends TextEditingController {
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_TextSpanEditingController({@required TextSpan textSpan})
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: assert(textSpan != null),
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_textSpan = textSpan,
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super(text: textSpan.toPlainText());
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final TextSpan _textSpan;
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@override
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TextSpan buildTextSpan({BuildContext context, TextStyle style, bool withComposing}) {
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// This does not care about composing.
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return TextSpan(
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style: style,
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children: <TextSpan>[_textSpan],
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);
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}
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@override
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set text(String newText) {
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// This should never be reached.
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throw UnimplementedError();
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}
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}
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class _SpecialSelectableTextSelectionGestureDetectorBuilder extends TextSelectionGestureDetectorBuilder {
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_SpecialSelectableTextSelectionGestureDetectorBuilder({
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@required _SpecialSelectableTextState state,
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}) : _state = state,
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super(delegate: state);
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final _SpecialSelectableTextState _state;
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@override
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void onForcePressStart(ForcePressDetails details) {
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super.onForcePressStart(details);
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if (delegate.selectionEnabled && shouldShowSelectionToolbar) {
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editableText.showToolbar();
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}
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}
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@override
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void onForcePressEnd(ForcePressDetails details) {
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// Not required.
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}
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@override
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void onSingleLongTapMoveUpdate(LongPressMoveUpdateDetails details) {
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if (delegate.selectionEnabled) {
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switch (Theme.of(_state.context).platform) {
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case TargetPlatform.iOS:
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case TargetPlatform.macOS:
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renderEditable.selectPositionAt(
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from: details.globalPosition,
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cause: SelectionChangedCause.longPress,
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);
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break;
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case TargetPlatform.android:
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case TargetPlatform.fuchsia:
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case TargetPlatform.linux:
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case TargetPlatform.windows:
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renderEditable.selectWordsInRange(
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from: details.globalPosition - details.offsetFromOrigin,
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to: details.globalPosition,
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cause: SelectionChangedCause.longPress,
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);
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break;
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}
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}
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}
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@override
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void onSingleTapUp(TapUpDetails details) {
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editableText.hideToolbar();
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if (delegate.selectionEnabled) {
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switch (Theme.of(_state.context).platform) {
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case TargetPlatform.iOS:
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case TargetPlatform.macOS:
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renderEditable.selectWordEdge(cause: SelectionChangedCause.tap);
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break;
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case TargetPlatform.android:
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case TargetPlatform.fuchsia:
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case TargetPlatform.linux:
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case TargetPlatform.windows:
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renderEditable.selectPosition(cause: SelectionChangedCause.tap);
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break;
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}
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}
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if (_state.widget.onTap != null) _state.widget.onTap();
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}
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@override
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void onSingleLongTapStart(LongPressStartDetails details) {
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if (delegate.selectionEnabled) {
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switch (Theme.of(_state.context).platform) {
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case TargetPlatform.iOS:
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case TargetPlatform.macOS:
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renderEditable.selectPositionAt(
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from: details.globalPosition,
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cause: SelectionChangedCause.longPress,
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);
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break;
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case TargetPlatform.android:
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case TargetPlatform.fuchsia:
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case TargetPlatform.linux:
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case TargetPlatform.windows:
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renderEditable.selectWord(cause: SelectionChangedCause.longPress);
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Feedback.forLongPress(_state.context);
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break;
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}
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}
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}
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}
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/// A run of selectable text with a single style.
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///
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/// The [SpecialSelectableText] widget displays a string of text with a single style.
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/// The string might break across multiple lines or might all be displayed on
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/// the same line depending on the layout constraints.
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///
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/// {@youtube 560 315 https://www.youtube.com/watch?v=ZSU3ZXOs6hc}
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///
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/// The [style] argument is optional. When omitted, the text will use the style
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/// from the closest enclosing [DefaultTextStyle]. If the given style's
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/// [TextStyle.inherit] property is true (the default), the given style will
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/// be merged with the closest enclosing [DefaultTextStyle]. This merging
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/// behavior is useful, for example, to make the text bold while using the
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/// default font family and size.
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///
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/// {@tool snippet}
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///
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/// ```dart
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/// SpecialSelectableText(
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/// 'Hello! How are you?',
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/// textAlign: TextAlign.center,
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/// style: TextStyle(fontWeight: FontWeight.bold),
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/// )
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/// ```
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/// {@end-tool}
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///
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/// Using the [SpecialSelectableText.rich] constructor, the [SpecialSelectableText] widget can
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/// display a paragraph with differently styled [TextSpan]s. The sample
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/// that follows displays "Hello beautiful world" with different styles
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/// for each word.
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///
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/// {@tool snippet}
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///
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/// ```dart
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/// const SpecialSelectableText.rich(
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/// TextSpan(
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/// text: 'Hello', // default text style
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/// children: <TextSpan>[
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/// TextSpan(text: ' beautiful ', style: TextStyle(fontStyle: FontStyle.italic)),
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/// TextSpan(text: 'world', style: TextStyle(fontWeight: FontWeight.bold)),
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/// ],
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/// ),
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/// )
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/// ```
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/// {@end-tool}
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///
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/// ## Interactivity
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///
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/// To make [SpecialSelectableText] react to touch events, use callback [onTap] to achieve
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/// the desired behavior.
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///
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/// See also:
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///
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/// * [Text], which is the non selectable version of this widget.
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/// * [TextField], which is the editable version of this widget.
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class SpecialSelectableText extends StatefulWidget {
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/// Creates a selectable text widget.
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///
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/// If the [style] argument is null, the text will use the style from the
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/// closest enclosing [DefaultTextStyle].
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///
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/// The [showCursor], [autofocus], [dragStartBehavior], and [data] parameters
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/// must not be null. If specified, the [maxLines] argument must be greater
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/// than zero.
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const SpecialSelectableText(
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this.data, {
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Key key,
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this.focusNode,
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this.style,
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this.strutStyle,
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this.textAlign,
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this.textDirection,
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this.textScaleFactor,
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this.showCursor = false,
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this.autofocus = false,
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ToolbarOptions toolbarOptions,
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this.minLines,
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this.maxLines,
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this.cursorWidth = 2.0,
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this.cursorRadius,
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this.cursorColor,
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this.dragStartBehavior = DragStartBehavior.start,
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this.enableInteractiveSelection = true,
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this.onTap,
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this.scrollPhysics,
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this.textHeightBehavior,
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this.textWidthBasis,
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}) : assert(showCursor != null),
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assert(autofocus != null),
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assert(dragStartBehavior != null),
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assert(maxLines == null || maxLines > 0),
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assert(minLines == null || minLines > 0),
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assert(
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(maxLines == null) || (minLines == null) || (maxLines >= minLines),
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'minLines can\'t be greater than maxLines',
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),
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assert(
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data != null,
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'A non-null String must be provided to a SpecialSelectableText widget.',
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),
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textSpan = null,
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toolbarOptions = toolbarOptions ??
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const ToolbarOptions(
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selectAll: true,
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copy: true,
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),
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super(key: key);
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/// Creates a selectable text widget with a [TextSpan].
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///
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/// The [textSpan] parameter must not be null and only contain [TextSpan] in
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/// [textSpan.children]. Other type of [InlineSpan] is not allowed.
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///
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/// The [autofocus] and [dragStartBehavior] arguments must not be null.
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const SpecialSelectableText.rich(
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this.textSpan, {
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Key key,
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this.focusNode,
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this.style,
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this.strutStyle,
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this.textAlign,
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this.textDirection,
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this.textScaleFactor,
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this.showCursor = false,
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this.autofocus = false,
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ToolbarOptions toolbarOptions,
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this.minLines,
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this.maxLines,
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this.cursorWidth = 2.0,
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this.cursorRadius,
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this.cursorColor,
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this.dragStartBehavior = DragStartBehavior.start,
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this.enableInteractiveSelection = true,
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this.onTap,
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this.scrollPhysics,
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this.textHeightBehavior,
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this.textWidthBasis,
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}) : assert(showCursor != null),
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assert(autofocus != null),
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assert(dragStartBehavior != null),
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assert(maxLines == null || maxLines > 0),
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assert(minLines == null || minLines > 0),
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assert(
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(maxLines == null) || (minLines == null) || (maxLines >= minLines),
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'minLines can\'t be greater than maxLines',
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),
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assert(
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textSpan != null,
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'A non-null TextSpan must be provided to a SpecialSelectableText.rich widget.',
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),
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data = null,
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toolbarOptions = toolbarOptions ??
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const ToolbarOptions(
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selectAll: true,
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copy: true,
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),
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super(key: key);
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/// The text to display.
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///
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/// This will be null if a [textSpan] is provided instead.
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final String data;
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/// The text to display as a [TextSpan].
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///
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/// This will be null if [data] is provided instead.
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final TextSpan textSpan;
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/// Defines the focus for this widget.
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///
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/// Text is only selectable when widget is focused.
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///
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/// The [focusNode] is a long-lived object that's typically managed by a
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/// [StatefulWidget] parent. See [FocusNode] for more information.
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///
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/// To give the focus to this widget, provide a [focusNode] and then
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/// use the current [FocusScope] to request the focus:
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///
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/// ```dart
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/// FocusScope.of(context).requestFocus(myFocusNode);
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/// ```
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///
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/// This happens automatically when the widget is tapped.
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///
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/// To be notified when the widget gains or loses the focus, add a listener
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/// to the [focusNode]:
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///
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/// ```dart
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/// focusNode.addListener(() { print(myFocusNode.hasFocus); });
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/// ```
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///
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/// If null, this widget will create its own [FocusNode].
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final FocusNode focusNode;
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/// The style to use for the text.
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///
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/// If null, defaults [DefaultTextStyle] of context.
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final TextStyle style;
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/// {@macro flutter.widgets.editableText.strutStyle}
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final StrutStyle strutStyle;
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/// {@macro flutter.widgets.editableText.textAlign}
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final TextAlign textAlign;
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/// {@macro flutter.widgets.editableText.textDirection}
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final TextDirection textDirection;
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/// {@macro flutter.widgets.editableText.textScaleFactor}
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final double textScaleFactor;
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/// {@macro flutter.widgets.editableText.autofocus}
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final bool autofocus;
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/// {@macro flutter.widgets.editableText.minLines}
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final int minLines;
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/// {@macro flutter.widgets.editableText.maxLines}
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final int maxLines;
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/// {@macro flutter.widgets.editableText.showCursor}
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final bool showCursor;
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/// {@macro flutter.widgets.editableText.cursorWidth}
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final double cursorWidth;
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/// {@macro flutter.widgets.editableText.cursorRadius}
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final Radius cursorRadius;
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/// The color to use when painting the cursor.
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///
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/// Defaults to the theme's `cursorColor` when null.
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final Color cursorColor;
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/// {@macro flutter.widgets.editableText.enableInteractiveSelection}
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final bool enableInteractiveSelection;
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/// {@macro flutter.widgets.scrollable.dragStartBehavior}
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final DragStartBehavior dragStartBehavior;
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/// Configuration of toolbar options.
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///
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/// Paste and cut will be disabled regardless.
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///
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/// If not set, select all and copy will be enabled by default.
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final ToolbarOptions toolbarOptions;
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/// {@macro flutter.rendering.editable.selectionEnabled}
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bool get selectionEnabled {
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return enableInteractiveSelection;
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}
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/// Called when the user taps on this selectable text.
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///
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/// The selectable text builds a [GestureDetector] to handle input events like tap,
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/// to trigger focus requests, to move the caret, adjust the selection, etc.
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/// Handling some of those events by wrapping the selectable text with a competing
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/// GestureDetector is problematic.
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///
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/// To unconditionally handle taps, without interfering with the selectable text's
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/// internal gesture detector, provide this callback.
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///
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/// To be notified when the text field gains or loses the focus, provide a
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/// [focusNode] and add a listener to that.
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///
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/// To listen to arbitrary pointer events without competing with the
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/// selectable text's internal gesture detector, use a [Listener].
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final GestureTapCallback onTap;
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/// {@macro flutter.widgets.editableText.scrollPhysics}
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final ScrollPhysics scrollPhysics;
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/// {@macro flutter.dart:ui.textHeightBehavior}
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final TextHeightBehavior textHeightBehavior;
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/// {@macro flutter.painting.textPainter.textWidthBasis}
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final TextWidthBasis textWidthBasis;
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@override
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_SpecialSelectableTextState createState() => _SpecialSelectableTextState();
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@override
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void debugFillProperties(DiagnosticPropertiesBuilder properties) {
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super.debugFillProperties(properties);
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properties.add(DiagnosticsProperty<String>('data', data, defaultValue: null));
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properties.add(DiagnosticsProperty<FocusNode>('focusNode', focusNode, defaultValue: null));
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properties.add(DiagnosticsProperty<TextStyle>('style', style, defaultValue: null));
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properties.add(DiagnosticsProperty<bool>('autofocus', autofocus, defaultValue: false));
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properties.add(DiagnosticsProperty<bool>('showCursor', showCursor, defaultValue: false));
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properties.add(IntProperty('minLines', minLines, defaultValue: null));
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properties.add(IntProperty('maxLines', maxLines, defaultValue: null));
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properties.add(EnumProperty<TextAlign>('textAlign', textAlign, defaultValue: null));
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properties.add(EnumProperty<TextDirection>('textDirection', textDirection, defaultValue: null));
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properties.add(DoubleProperty('textScaleFactor', textScaleFactor, defaultValue: null));
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properties.add(DoubleProperty('cursorWidth', cursorWidth, defaultValue: 2.0));
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properties.add(DiagnosticsProperty<Radius>('cursorRadius', cursorRadius, defaultValue: null));
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properties.add(DiagnosticsProperty<Color>('cursorColor', cursorColor, defaultValue: null));
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properties.add(
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FlagProperty('selectionEnabled', value: selectionEnabled, defaultValue: true, ifFalse: 'selection disabled'));
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properties.add(DiagnosticsProperty<ScrollPhysics>('scrollPhysics', scrollPhysics, defaultValue: null));
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properties
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.add(DiagnosticsProperty<TextHeightBehavior>('textHeightBehavior', textHeightBehavior, defaultValue: null));
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}
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}
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class _SpecialSelectableTextState extends State<SpecialSelectableText>
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with AutomaticKeepAliveClientMixin
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implements TextSelectionGestureDetectorBuilderDelegate {
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EditableTextState get _editableText => editableTextKey.currentState;
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_TextSpanEditingController _controller;
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FocusNode _keyFocusNode = FocusNode();
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FocusNode _focusNode;
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FocusNode get _effectiveFocusNode => widget.focusNode ?? (_focusNode ??= FocusNode());
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bool _showSelectionHandles = false;
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_SpecialSelectableTextSelectionGestureDetectorBuilder _selectionGestureDetectorBuilder;
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// API for TextSelectionGestureDetectorBuilderDelegate.
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@override
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bool forcePressEnabled;
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@override
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final GlobalKey<EditableTextState> editableTextKey = GlobalKey<EditableTextState>();
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@override
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bool get selectionEnabled => widget.selectionEnabled;
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// End of API for TextSelectionGestureDetectorBuilderDelegate.
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@override
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void initState() {
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super.initState();
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_selectionGestureDetectorBuilder = _SpecialSelectableTextSelectionGestureDetectorBuilder(state: this);
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_controller = _TextSpanEditingController(textSpan: widget.textSpan ?? TextSpan(text: widget.data));
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}
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@override
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void didUpdateWidget(SpecialSelectableText oldWidget) {
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super.didUpdateWidget(oldWidget);
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if (widget.data != oldWidget.data || widget.textSpan != oldWidget.textSpan) {
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_controller = _TextSpanEditingController(textSpan: widget.textSpan ?? TextSpan(text: widget.data));
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}
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if (_effectiveFocusNode.hasFocus && _controller.selection.isCollapsed) {
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_showSelectionHandles = false;
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}
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}
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@override
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void dispose() {
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_focusNode?.dispose();
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super.dispose();
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}
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void _handleSelectionChanged(TextSelection selection, SelectionChangedCause cause) {
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final bool willShowSelectionHandles = _shouldShowSelectionHandles(cause);
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if (willShowSelectionHandles != _showSelectionHandles) {
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setState(() {
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_showSelectionHandles = willShowSelectionHandles;
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});
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}
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switch (Theme.of(context).platform) {
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case TargetPlatform.iOS:
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case TargetPlatform.macOS:
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if (cause == SelectionChangedCause.longPress) {
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_editableText?.bringIntoView(selection.base);
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}
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return;
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case TargetPlatform.android:
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case TargetPlatform.fuchsia:
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case TargetPlatform.linux:
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case TargetPlatform.windows:
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// Do nothing.
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}
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}
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/// Toggle the toolbar when a selection handle is tapped.
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void _handleSelectionHandleTapped() {
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if (_controller.selection.isCollapsed) {
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_editableText.toggleToolbar();
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}
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}
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bool _shouldShowSelectionHandles(SelectionChangedCause cause) {
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// When the text field is activated by something that doesn't trigger the
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// selection overlay, we shouldn't show the handles either.
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if (!_selectionGestureDetectorBuilder.shouldShowSelectionToolbar) return false;
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if (_controller.selection.isCollapsed) return false;
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if (cause == SelectionChangedCause.keyboard) return false;
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|
|
if (cause == SelectionChangedCause.longPress) return true;
|
|
|
|
if (_controller.text.isNotEmpty) return true;
|
|
|
|
return false;
|
|
}
|
|
|
|
@override
|
|
bool get wantKeepAlive => true;
|
|
|
|
@override
|
|
Widget build(BuildContext context) {
|
|
super.build(context); // See AutomaticKeepAliveClientMixin.
|
|
assert(() {
|
|
return _controller._textSpan.visitChildren((InlineSpan span) => span.runtimeType == TextSpan);
|
|
}(), 'SpecialSelectableText only supports TextSpan; Other type of InlineSpan is not allowed');
|
|
assert(debugCheckHasMediaQuery(context));
|
|
assert(debugCheckHasDirectionality(context));
|
|
assert(
|
|
!(widget.style != null &&
|
|
widget.style.inherit == false &&
|
|
(widget.style.fontSize == null || widget.style.textBaseline == null)),
|
|
'inherit false style must supply fontSize and textBaseline',
|
|
);
|
|
|
|
final ThemeData themeData = Theme.of(context);
|
|
final FocusNode focusNode = _effectiveFocusNode;
|
|
|
|
TextSelectionControls textSelectionControls;
|
|
bool paintCursorAboveText;
|
|
bool cursorOpacityAnimates;
|
|
Offset cursorOffset;
|
|
Color cursorColor = widget.cursorColor;
|
|
Radius cursorRadius = widget.cursorRadius;
|
|
|
|
switch (themeData.platform) {
|
|
case TargetPlatform.iOS:
|
|
case TargetPlatform.macOS:
|
|
forcePressEnabled = true;
|
|
textSelectionControls = cupertinoTextSelectionControls;
|
|
paintCursorAboveText = true;
|
|
cursorOpacityAnimates = true;
|
|
cursorColor ??= CupertinoTheme.of(context).primaryColor;
|
|
cursorRadius ??= const Radius.circular(2.0);
|
|
cursorOffset = Offset(iOSHorizontalOffset / MediaQuery.of(context).devicePixelRatio, 0);
|
|
break;
|
|
|
|
case TargetPlatform.android:
|
|
case TargetPlatform.fuchsia:
|
|
case TargetPlatform.linux:
|
|
case TargetPlatform.windows:
|
|
forcePressEnabled = false;
|
|
textSelectionControls = materialTextSelectionControls;
|
|
paintCursorAboveText = false;
|
|
cursorOpacityAnimates = false;
|
|
cursorColor ??= themeData.cursorColor;
|
|
break;
|
|
}
|
|
|
|
final DefaultTextStyle defaultTextStyle = DefaultTextStyle.of(context);
|
|
TextStyle effectiveTextStyle = widget.style;
|
|
if (widget.style == null || widget.style.inherit) effectiveTextStyle = defaultTextStyle.style.merge(widget.style);
|
|
if (MediaQuery.boldTextOverride(context))
|
|
effectiveTextStyle = effectiveTextStyle.merge(const TextStyle(fontWeight: FontWeight.bold));
|
|
final Widget child = RepaintBoundary(
|
|
child: EditableText(
|
|
key: editableTextKey,
|
|
style: effectiveTextStyle,
|
|
readOnly: true,
|
|
textWidthBasis: widget.textWidthBasis ?? defaultTextStyle.textWidthBasis,
|
|
textHeightBehavior: widget.textHeightBehavior ?? defaultTextStyle.textHeightBehavior,
|
|
showSelectionHandles: _showSelectionHandles,
|
|
showCursor: widget.showCursor,
|
|
controller: _controller,
|
|
focusNode: focusNode,
|
|
strutStyle: widget.strutStyle ?? const StrutStyle(),
|
|
textAlign: widget.textAlign ?? defaultTextStyle.textAlign ?? TextAlign.start,
|
|
textDirection: widget.textDirection,
|
|
textScaleFactor: widget.textScaleFactor,
|
|
autofocus: widget.autofocus,
|
|
forceLine: false,
|
|
toolbarOptions: widget.toolbarOptions,
|
|
minLines: widget.minLines,
|
|
maxLines: widget.maxLines ?? defaultTextStyle.maxLines,
|
|
selectionColor: themeData.textSelectionColor,
|
|
selectionControls: widget.selectionEnabled ? textSelectionControls : null,
|
|
onSelectionChanged: _handleSelectionChanged,
|
|
onSelectionHandleTapped: _handleSelectionHandleTapped,
|
|
rendererIgnoresPointer: true,
|
|
cursorWidth: widget.cursorWidth,
|
|
cursorRadius: cursorRadius,
|
|
cursorColor: cursorColor,
|
|
cursorOpacityAnimates: cursorOpacityAnimates,
|
|
cursorOffset: cursorOffset,
|
|
paintCursorAboveText: paintCursorAboveText,
|
|
backgroundCursorColor: CupertinoColors.inactiveGray,
|
|
enableInteractiveSelection: widget.enableInteractiveSelection,
|
|
dragStartBehavior: widget.dragStartBehavior,
|
|
scrollPhysics: widget.scrollPhysics,
|
|
),
|
|
);
|
|
|
|
return Semantics(
|
|
onTap: () {
|
|
if (!_controller.selection.isValid)
|
|
_controller.selection = TextSelection.collapsed(offset: _controller.text.length);
|
|
_effectiveFocusNode.requestFocus();
|
|
},
|
|
onLongPress: () {
|
|
_effectiveFocusNode.requestFocus();
|
|
},
|
|
child: _selectionGestureDetectorBuilder.buildGestureDetector(
|
|
behavior: HitTestBehavior.translucent,
|
|
child: RawKeyboardListener(
|
|
focusNode: _keyFocusNode,
|
|
onKey: _onKey,
|
|
child: child,
|
|
)),
|
|
);
|
|
}
|
|
|
|
_onKey(RawKeyEvent event) {
|
|
// We don't care about key up events
|
|
if (event is RawKeyUpEvent) {
|
|
return;
|
|
}
|
|
|
|
//TODO: tab to next focus node
|
|
|
|
// Handle special keyboard events with control key
|
|
if (event.data.isControlPressed) {
|
|
// Handle select all
|
|
if (event.logicalKey == LogicalKeyboardKey.keyA) {
|
|
_controller.selection = TextSelection(baseOffset: 0, extentOffset: _controller.text.length);
|
|
return;
|
|
}
|
|
|
|
// Handle copy
|
|
if (event.logicalKey == LogicalKeyboardKey.keyC) {
|
|
Clipboard.setData(ClipboardData(text: _controller.selection.textInside(_controller.text)));
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
}
|