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官方输入框的扩展组件，支持图片，@某人，自定义文字背景。也支持自定义菜单和选择器。
ExtendedTextField 是 Flutter 官方 TextField 的三方扩展库，主要扩展功能如下:
| 功能 | ExtendedTextField | TextField |
|---|---|---|
| 图文混合 | 支持，可以实现图文混合显示 | 仅支持显示文本，但在选择文本时会出现问题 |
| 支持复制真实值 | 支持，可以复制出文本的真实值 | 不支持 |
| 根据文本格式快速构建富文本 | 支持，可以根据文本格式快速构建富文本 | 不支持 |
已支持
HarmonyOS. 请使用最新的带有ohos标志的版本. 你可以在Versions签查找.
dependencies:
extended_text_field: 11.0.1-ohos-
不支持TextDirection.rtl，从右向左.
-
不支持obscureText为true.
extended_text 帮助将字符串文本快速转换为特殊的TextSpan
下面的例子告诉你怎么创建一个@xxx
具体思路是对字符串进行进栈遍历，通过判断flag来判定是否是一个特殊字符。 例子：@zmtzawqlp ，以@开头并且以空格结束，我们就认为它是一个@的特殊文本
class AtText extends SpecialText {
static const String flag = "@";
final int start;
/// whether show background for @somebody
final bool showAtBackground;
AtText(TextStyle textStyle, SpecialTextGestureTapCallback onTap,
{this.showAtBackground: false, this.start})
: super(
flag,
" ",
textStyle,
);
@override
InlineSpan finishText() {
TextStyle textStyle =
this.textStyle?.copyWith(color: Colors.blue, fontSize: 16.0);
final String atText = toString();
return showAtBackground
? BackgroundTextSpan(
background: Paint()..color = Colors.blue.withOpacity(0.15),
text: atText,
actualText: atText,
start: start,
///caret can move into special text
deleteAll: true,
style: textStyle,
recognizer: (TapGestureRecognizer()
..onTap = () {
if (onTap != null) onTap(atText);
}))
: SpecialTextSpan(
text: atText,
actualText: atText,
start: start,
style: textStyle,
recognizer: (TapGestureRecognizer()
..onTap = () {
if (onTap != null) onTap(atText);
}));
}
}
创建属于你自己规则的Builder，上面说了你可以继承SpecialText来定义各种各样的特殊文本。
- build 方法中，是通过具体思路是对字符串进行进栈遍历，通过判断flag来判定是否是一个特殊文本。 感兴趣的，可以看一下SpecialTextSpanBuilder里面build方法的实现，当然你也可以写出属于自己的build逻辑
- createSpecialText 通过判断flag来判定是否是一个特殊文本
class MySpecialTextSpanBuilder extends SpecialTextSpanBuilder {
/// whether show background for @somebody
final bool showAtBackground;
final BuilderType type;
MySpecialTextSpanBuilder(
{this.showAtBackground: false, this.type: BuilderType.extendedText});
@override
TextSpan build(String data, {TextStyle textStyle, onTap}) {
var textSpan = super.build(data, textStyle: textStyle, onTap: onTap);
return textSpan;
}
@override
SpecialText createSpecialText(String flag,
{TextStyle textStyle, SpecialTextGestureTapCallback onTap, int index}) {
if (flag == null || flag == "") return null;
///index is end index of start flag, so text start index should be index-(flag.length-1)
if (isStart(flag, AtText.flag)) {
return AtText(textStyle, onTap,
start: index - (AtText.flag.length - 1),
showAtBackground: showAtBackground,
type: type);
} else if (isStart(flag, EmojiText.flag)) {
return EmojiText(textStyle, start: index - (EmojiText.flag.length - 1));
} else if (isStart(flag, DollarText.flag)) {
return DollarText(textStyle, onTap,
start: index - (DollarText.flag.length - 1), type: type);
}
return null;
}
}其实你也不是一定要用这套代码将字符串转换为TextSpan，你可以有自己的方法，给最后的TextSpan就可以了。
使用ImageSpan 展示图片
ImageSpan(
ImageProvider image, {
Key key,
@required double imageWidth,
@required double imageHeight,
EdgeInsets margin,
int start: 0,
ui.PlaceholderAlignment alignment = ui.PlaceholderAlignment.bottom,
String actualText,
TextBaseline baseline,
TextStyle style,
BoxFit fit: BoxFit.scaleDown,
ImageLoadingBuilder loadingBuilder,
ImageFrameBuilder frameBuilder,
String semanticLabel,
bool excludeFromSemantics = false,
Color color,
BlendMode colorBlendMode,
AlignmentGeometry imageAlignment = Alignment.center,
ImageRepeat repeat = ImageRepeat.noRepeat,
Rect centerSlice,
bool matchTextDirection = false,
bool gaplessPlayback = false,
FilterQuality filterQuality = FilterQuality.low,
})
ImageSpan(AssetImage("xxx.jpg"),
imageWidth: size,
imageHeight: size,
margin: EdgeInsets.only(left: 2.0, bottom: 0.0, right: 2.0));
}| 参数 | 描述 | 默认 |
|---|---|---|
| image | 图片展示的Provider(ImageProvider) | - |
| imageWidth | 宽度，不包括 margin | 必填 |
| imageHeight | 高度，不包括 margin | 必填 |
| margin | 图片的margin | - |
| actualText | 真实的文本,当你开启文本选择功能的时候，必须设置,比如图片"[love] | 空占位符'\uFFFC' |
| start | 在文本字符串中的开始位置,当你开启文本选择功能的时候，必须设置 | 0 |
你可以用ExtendedNetworkImageProvider来缓存文本中的图片，使用clearDiskCachedImages方法来清掉本地缓存
引入 extended_image_library
dependencies:
extended_image_library: ^0.1.4ExtendedNetworkImageProvider(
this.url, {
this.scale = 1.0,
this.headers,
this.cache: false,
this.retries = 3,
this.timeLimit,
this.timeRetry = const Duration(milliseconds: 100),
CancellationToken cancelToken,
}) : assert(url != null),
assert(scale != null),
cancelToken = cancelToken ?? CancellationToken();| 参数 | 描述 | 默认 |
|---|---|---|
| url | 网络请求地址 | required |
| scale | ImageInfo中的scale | 1.0 |
| headers | HttpClient的headers | - |
| cache | 是否缓存到本地 | false |
| retries | 请求尝试次数 | 3 |
| timeLimit | 请求超时 | - |
| timeRetry | 请求重试间隔 | milliseconds: 100 |
| cancelToken | 用于取消请求的Token | CancellationToken() |
/// Clear the disk cache directory then return if it succeed.
/// <param name="duration">timespan to compute whether file has expired or not</param>
Future<bool> clearDiskCachedImages({Duration duration}) async
提供了默认的控制器MaterialExtendedTextSelectionControls/CupertinoExtendedTextSelectionControls
通过重写 [ExtendedTextField.extendedContextMenuBuilder] 和 [TextSelectionControls] 来自定义菜单和选择器。
const double _kHandleSize = 22.0;
/// Android Material styled text selection controls.
class MyTextSelectionControls extends TextSelectionControls
with TextSelectionHandleControls {
static Widget defaultContextMenuBuilder(
BuildContext context, ExtendedEditableTextState editableTextState) {
return AdaptiveTextSelectionToolbar.buttonItems(
buttonItems: <ContextMenuButtonItem>[
...editableTextState.contextMenuButtonItems,
ContextMenuButtonItem(
onPressed: () {
launchUrl(
Uri.parse(
'mailto:zmtzawqlp@live.com?subject=extended_text_share&body=${editableTextState.textEditingValue.text}',
),
);
editableTextState.hideToolbar(true);
editableTextState.textEditingValue
.copyWith(selection: const TextSelection.collapsed(offset: 0));
},
type: ContextMenuButtonType.custom,
label: 'like',
),
],
anchors: editableTextState.contextMenuAnchors,
);
// return AdaptiveTextSelectionToolbar.editableText(
// editableTextState: editableTextState,
// );
}
/// Returns the size of the Material handle.
@override
Size getHandleSize(double textLineHeight) =>
const Size(_kHandleSize, _kHandleSize);
/// Builder for material-style text selection handles.
@override
Widget buildHandle(
BuildContext context, TextSelectionHandleType type, double textLineHeight,
[VoidCallback? onTap, double? startGlyphHeight, double? endGlyphHeight]) {
final Widget handle = SizedBox(
width: _kHandleSize,
height: _kHandleSize,
child: Image.asset(
'assets/40.png',
),
);
// [handle] is a circle, with a rectangle in the top left quadrant of that
// circle (an onion pointing to 10:30). We rotate [handle] to point
// straight up or up-right depending on the handle type.
switch (type) {
case TextSelectionHandleType.left: // points up-right
return Transform.rotate(
angle: math.pi / 4.0,
child: handle,
);
case TextSelectionHandleType.right: // points up-left
return Transform.rotate(
angle: -math.pi / 4.0,
child: handle,
);
case TextSelectionHandleType.collapsed: // points up
return handle;
}
}
/// Gets anchor for material-style text selection handles.
///
/// See [TextSelectionControls.getHandleAnchor].
@override
Offset getHandleAnchor(TextSelectionHandleType type, double textLineHeight,
[double? startGlyphHeight, double? endGlyphHeight]) {
switch (type) {
case TextSelectionHandleType.left:
return const Offset(_kHandleSize, 0);
case TextSelectionHandleType.right:
return Offset.zero;
default:
return const Offset(_kHandleSize / 2, -4);
}
}
@override
bool canSelectAll(TextSelectionDelegate delegate) {
// Android allows SelectAll when selection is not collapsed, unless
// everything has already been selected.
final TextEditingValue value = delegate.textEditingValue;
return delegate.selectAllEnabled &&
value.text.isNotEmpty &&
!(value.selection.start == 0 &&
value.selection.end == value.text.length);
}
}
ExtendedWidgetSpan 支持选择以及hitTest, 所以你可以在输入框中加入任何的widget。
class EmailText extends SpecialText {
final TextEditingController controller;
final int start;
final BuildContext context;
EmailText(TextStyle textStyle, SpecialTextGestureTapCallback onTap,
{this.start, this.controller, this.context, String startFlag})
: super(startFlag, " ", textStyle, onTap: onTap);
@override
bool isEnd(String value) {
var index = value.indexOf("@");
var index1 = value.indexOf(".");
return index >= 0 &&
index1 >= 0 &&
index1 > index + 1 &&
super.isEnd(value);
}
@override
InlineSpan finishText() {
final String text = toString();
return ExtendedWidgetSpan(
actualText: text,
start: start,
alignment: ui.PlaceholderAlignment.middle,
child: GestureDetector(
child: Padding(
padding: EdgeInsets.only(right: 5.0, top: 2.0, bottom: 2.0),
child: ClipRRect(
borderRadius: BorderRadius.all(Radius.circular(5.0)),
child: Container(
padding: EdgeInsets.all(5.0),
color: Colors.orange,
child: Row(
mainAxisAlignment: MainAxisAlignment.start,
mainAxisSize: MainAxisSize.min,
children: <Widget>[
Text(
text.trim(),
//style: textStyle?.copyWith(color: Colors.orange),
),
SizedBox(
width: 5.0,
),
InkWell(
child: Icon(
Icons.close,
size: 15.0,
),
onTap: () {
controller.value = controller.value.copyWith(
text: controller.text
.replaceRange(start, start + text.length, ""),
selection: TextSelection.fromPosition(
TextPosition(offset: start)));
},
)
],
),
)),
),
onTap: () {
showDialog(
context: context,
barrierDismissible: true,
builder: (c) {
TextEditingController textEditingController =
TextEditingController()..text = text.trim();
return Column(
children: <Widget>[
Expanded(
child: Container(),
),
Material(
child: Padding(
padding: EdgeInsets.all(10.0),
child: TextField(
controller: textEditingController,
decoration: InputDecoration(
suffixIcon: FlatButton(
child: Text("OK"),
onPressed: () {
controller.value = controller.value.copyWith(
text: controller.text.replaceRange(
start,
start + text.length,
textEditingController.text + " "),
selection: TextSelection.fromPosition(
TextPosition(
offset: start +
(textEditingController.text + " ")
.length)));
Navigator.pop(context);
},
)),
),
)),
Expanded(
child: Container(),
)
],
);
});
},
),
deleteAll: true,
);
}
}我们不需要代码侵入到 [ExtendedTextField] 或者 [TextField] 当中， 就可以阻止系统键盘弹出，
我们通过阻止 Flutter Framework 发送 TextInput.show 到 Flutter 引擎来阻止系统键盘弹出
你可以直接使用 [TextInputBinding].
void main() {
TextInputBinding();
runApp(const MyApp());
}或者你如果有其他的 binding，你可以这样。
class YourBinding extends WidgetsFlutterBinding with TextInputBindingMixin,YourBindingMixin {
}
void main() {
YourBinding();
runApp(const MyApp());
}或者你需要重载 ignoreTextInputShow 方法，你可以这样。
class YourBinding extends TextInputBinding {
@override
// ignore: unnecessary_overrides
bool ignoreTextInputShow() {
// you can override it base on your case
// if NoKeyboardFocusNode is not enough
return super.ignoreTextInputShow();
}
}
void main() {
YourBinding();
runApp(const MyApp());
}把 [TextInputFocusNode] 传递给 [ExtendedTextField] 或者 [TextField]。
final TextInputFocusNode _focusNode = TextInputFocusNode();
@override
Widget build(BuildContext context) {
return ExtendedTextField(
// request keyboard if need
focusNode: _focusNode..debugLabel = 'ExtendedTextField',
);
}
@override
Widget build(BuildContext context) {
return TextField(
// request keyboard if need
focusNode: _focusNode..debugLabel = 'CustomTextField',
);
}我们通过当前的 FocusNode 是否是 [TextInputFocusNode],来决定是否阻止系统键盘弹出的。
final FocusNode? focus = FocusManager.instance.primaryFocus;
if (focus != null &&
focus is TextInputFocusNode &&
focus.ignoreSystemKeyboardShow) {
return true;
}你可以通过当前焦点的变化的时候，来显示或者隐藏自定义的键盘。
当你的自定义键盘可以关闭而不让焦点失去，你应该在 [ExtendedTextField] 或者 [TextField]
的 onTap 事件中，再次判断键盘是否显示。
@override
void initState() {
super.initState();
_focusNode.addListener(_handleFocusChanged);
}
void _onTextFiledTap() {
if (_bottomSheetController == null) {
_handleFocusChanged();
}
}
void _handleFocusChanged() {
if (_focusNode.hasFocus) {
// just demo, you can define your custom keyboard as you want
_bottomSheetController = showBottomSheet<void>(
context: FocusManager.instance.primaryFocus!.context!,
// set false, if don't want to drag to close custom keyboard
enableDrag: true,
builder: (BuildContext b) {
// your custom keyboard
return Container();
});
// maybe drag close
_bottomSheetController?.closed.whenComplete(() {
_bottomSheetController = null;
});
} else {
_bottomSheetController?.close();
_bottomSheetController = null;
}
}
@override
void dispose() {
_focusNode.removeListener(_handleFocusChanged);
super.dispose();
}查看 完整的例子
