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extended text

extended_text #

Language: English | 中文简体
Extended official text to build special text like inline image or @somebody quickly,it also support custom background,custom over flow and custom selection toolbar and handles.
Web demo for ExtendedText
ExtendedText is a third-party extension library for Flutter's official Text component. The main extended features are as follows:

Feature
ExtendedText
Text

Customized text overflow effects
Supported, allows customizing the overflow widget and controlling overflow positions (before, middle, after)
Not supported (26748,45336)

Copying the actual value of special text
Supported, enables copying the actual value of the text, not just the placeholder value of WidgetSpan
Can only copy the placeholder value of WidgetSpan (\uFFFC)

Quick construction of rich text based on text format
Supported, enables quick construction of rich text based on text format
Not supported

HarmonyOS is supported. Please use the latest version which contains ohos tag. You can check it in Versions tab.

dependencies:
extended_text: 10.0.1-ohos
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Table of contents #

extended_text

Table of contents
Speical Text

Create Speical Text
SpecialTextSpanBuilder

Image

ImageSpan

Selection

TextSelectionControls
Control ToolBar Handle

Default Behavior
Custom Behavior

Custom Background
Custom Overflow
Join Zero-Width Space
Gradient

GradientConfig
IgnoreGradientSpan

Speical Text #

Create Speical Text #
extended text helps to convert your text to speical textSpan quickly.
for example, follwing code show how to create @xxxx speical textSpan.
class AtText extends SpecialText {
AtText(TextStyle textStyle, SpecialTextGestureTapCallback onTap,
{this.showAtBackground = false, this.start})
: super(flag, ' ', textStyle, onTap: onTap);
static const String flag = '@';
final int start;

/// whether show background for @somebody
final bool showAtBackground;

@override
InlineSpan finishText() {
final 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);
}
}));
}
}
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SpecialTextSpanBuilder #
create your SpecialTextSpanBuilder
class MySpecialTextSpanBuilder extends SpecialTextSpanBuilder {
MySpecialTextSpanBuilder({this.showAtBackground = false});

/// whether show background for @somebody
final bool showAtBackground;
@override
TextSpan build(String data,
{TextStyle textStyle, SpecialTextGestureTapCallback onTap}) {
if (kIsWeb) {
return TextSpan(text: data, style: textStyle);
}

return super.build(data, textStyle: textStyle, onTap: onTap);
}

@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,
);
} 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));
}
return null;
}
}
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Image #

ImageSpan #
show inline image by using ImageSpan.
class ImageSpan extends ExtendedWidgetSpan {
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,
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,
GestureTapCallback onTap,
HitTestBehavior behavior = HitTestBehavior.deferToChild,
})
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parameter
description
default

image
The image to display(ImageProvider).
-

imageWidth
The width of image(not include margin)
required

imageHeight
The height of image(not include margin)
required

margin
The margin of image
-

actualText
Actual text, take care of it when enable selection,something likes "[love]"
'\uFFFC'

start
Start index of text,take care of it when enable selection.
0

Selection #

parameter
description
default

selectionEnabled
Whether enable selection
false

selectionColor
Color of selection
Theme.of(context).textSelectionColor

dragStartBehavior
DragStartBehavior for text selection
DragStartBehavior.start

textSelectionControls
An interface for building the selection UI, to be provided by the implementor of the toolbar widget or handle widget
extendedMaterialTextSelectionControls/extendedCupertinoTextSelectionControls

TextSelectionControls #
override [SelectionArea.contextMenuBuilder] and [TextSelectionControls] to custom your toolbar widget or handle widget
const double _kHandleSize = 22.0;

/// Android Material styled text selection controls.

class MyTextSelectionControls extends TextSelectionControls
with TextSelectionHandleControls {
MyTextSelectionControls({this.joinZeroWidthSpace = false});
final bool joinZeroWidthSpace;

/// 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);
}
}
}

class CommonSelectionArea extends StatelessWidget {
const CommonSelectionArea({
super.key,
required this.child,
this.joinZeroWidthSpace = false,
});
final Widget child;
final bool joinZeroWidthSpace;

@override
Widget build(BuildContext context) {
SelectedContent? _selectedContent;
return SelectionArea(
contextMenuBuilder:
(BuildContext context, SelectableRegionState selectableRegionState) {
return AdaptiveTextSelectionToolbar.buttonItems(
buttonItems: <ContextMenuButtonItem>[
ContextMenuButtonItem(
onPressed: () {
// TODO(zmtzawqlp): how to get Selectable
// and _clearSelection is not public
// https://github.com/flutter/flutter/issues/126980

// onCopy: () {
// _copy();

// // In Android copy should clear the selection.
// switch (defaultTargetPlatform) {
// case TargetPlatform.android:
// case TargetPlatform.fuchsia:
// _clearSelection();
// case TargetPlatform.iOS:
// hideToolbar(false);
// case TargetPlatform.linux:
// case TargetPlatform.macOS:
// case TargetPlatform.windows:
// hideToolbar();
// }
// },

// if (_selectedContent != null) {
// String content = _selectedContent!.plainText;
// if (joinZeroWidthSpace) {
// content = content.replaceAll(zeroWidthSpace, '');
// }

// Clipboard.setData(ClipboardData(text: content));
// selectableRegionState.hideToolbar(true);
// selectableRegionState._clearSelection();
// }

selectableRegionState
.copySelection(SelectionChangedCause.toolbar);

// remove zeroWidthSpace
if (joinZeroWidthSpace) {
Clipboard.getData('text/plain').then((ClipboardData? value) {
if (value != null) {
// remove zeroWidthSpace
final String? plainText =
value.text?.replaceAll(ExtendedTextLibraryUtils.zeroWidthSpace, '');
if (plainText != null) {
Clipboard.setData(ClipboardData(text: plainText));
}
}
});
}
},
type: ContextMenuButtonType.copy,
),
ContextMenuButtonItem(
onPressed: () {
selectableRegionState.selectAll(SelectionChangedCause.toolbar);
},
type: ContextMenuButtonType.selectAll,
),
ContextMenuButtonItem(
onPressed: () {
launchUrl(Uri.parse(
'mailto:zmtzawqlp@live.com?subject=extended_text_share&body=${_selectedContent?.plainText}'));
selectableRegionState.hideToolbar();
},
type: ContextMenuButtonType.custom,
label: 'like',
),
],
anchors: selectableRegionState.contextMenuAnchors,
);
// return AdaptiveTextSelectionToolbar.selectableRegion(
// selectableRegionState: selectableRegionState,
// );
},
// magnifierConfiguration: TextMagnifierConfiguration(
// magnifierBuilder: (
// BuildContext context,
// MagnifierController controller,
// ValueNotifier<MagnifierInfo> magnifierInfo,
// ) {
// return TextMagnifier(
// magnifierInfo: magnifierInfo,
// );
// // switch (defaultTargetPlatform) {
// // case TargetPlatform.iOS:
// // return CupertinoTextMagnifier(
// // controller: controller,
// // magnifierInfo: magnifierInfo,
// // );
// // case TargetPlatform.android:
// // return TextMagnifier(
// // magnifierInfo: magnifierInfo,
// // );
// // case TargetPlatform.fuchsia:
// // case TargetPlatform.linux:
// // case TargetPlatform.macOS:
// // case TargetPlatform.windows:
// // return null;
// // }
// },
// ),
// selectionControls: MyTextSelectionControls(),
onSelectionChanged: (SelectedContent? value) {
print(value?.plainText);
_selectedContent = value;
},
child: child,
);
}
}

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Control ToolBar Handle #
contain your page into ExtendedTextSelectionPointerHandler, so you can control toolbar and handle.
Default Behavior
set your page as child of ExtendedTextSelectionPointerHandler
return ExtendedTextSelectionPointerHandler(
//default behavior
child: result,
);
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tap region outside of extended text, hide toolbar and handle
scorll, hide toolbar and handle

Custom Behavior
get selectionStates(ExtendedTextSelectionState) by builder call back, and handle by your self.
return ExtendedTextSelectionPointerHandler(
//default behavior
// child: result,
//custom your behavior
builder: (states) {
return Listener(
child: result,
behavior: HitTestBehavior.translucent,
onPointerDown: (value) {
for (var state in states) {
if (!state.containsPosition(value.position)) {
//clear other selection
state.clearSelection();
}
}
},
onPointerMove: (value) {
//clear other selection
for (var state in states) {
state.clearSelection();
}
},
);
},
);
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Custom Background #

refer to issues 24335/24337 about background
BackgroundTextSpan(
text:
"This text has nice background with borderradius,no mattter how many line,it likes nice",
background: Paint()..color = Colors.indigo,
clipBorderRadius: BorderRadius.all(Radius.circular(3.0))),
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parameter
description
default

background
Background painter
-

clipBorderRadius
Clip BorderRadius
-

paintBackground
Paint background call back, you can paint background by self
-

Custom Overflow #

refer to issue 26748

parameter
description
default

child
The widget of TextOverflow.
@required

maxHeight
The maxHeight of [TextOverflowWidget], default is preferredLineHeight.
preferredLineHeight

align
The Align of [TextOverflowWidget], left/right.
right

position
The position which TextOverflowWidget should be shown.
TextOverflowPosition.end

ExtendedText(
overflowWidget: TextOverflowWidget(
position: TextOverflowPosition.end,
align: TextOverflowAlign.center,
// just for debug
debugOverflowRectColor: Colors.red.withOpacity(0.1),
child: Container(
child: Row(
mainAxisSize: MainAxisSize.min,
children: <Widget>[
const Text('\u2026 '),
InkWell(
child: const Text(
'more',
),
onTap: () {
launch(
'https://github.com/fluttercandies/extended_text');
},
)
],
),
),
),
)
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Join Zero-Width Space #

refer to issue 18761
if [ExtendedText.joinZeroWidthSpace] is true, it will join '\u{200B}' into text, make line breaking and overflow style better.
ExtendedText(
joinZeroWidthSpace: true,
)
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or you can convert by following method:

String

String input='abc'.joinChar();
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InlineSpan

InlineSpan innerTextSpan;
innerTextSpan = joinChar(
innerTextSpan,
Accumulator(),
zeroWidthSpace,
);
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Take care of following things:

the word is not a word, it will not working when you want to double tap to select a word.

text is changed, if [ExtendedText.selectionEnabled] is true, you should override TextSelectionControls and remove zeroWidthSpace.

class MyTextSelectionControls extends TextSelectionControls {

@override
void handleCopy(TextSelectionDelegate delegate,
ClipboardStatusNotifier? clipboardStatus) {
final TextEditingValue value = delegate.textEditingValue;

String data = value.selection.textInside(value.text);
// remove zeroWidthSpace
data = data.replaceAll(zeroWidthSpace, '');

Clipboard.setData(ClipboardData(
text: value.selection.textInside(value.text),
));
clipboardStatus?.update();
delegate.textEditingValue = TextEditingValue(
text: value.text,
selection: TextSelection.collapsed(offset: value.selection.end),
);
delegate.bringIntoView(delegate.textEditingValue.selection.extent);
delegate.hideToolbar();
}
}

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Gradient #
GradientConfig #
Configuration for applying gradients to text.

[gradient] is the gradient that will be applied to the text.

[ignoreWidgetSpan] determines whether WidgetSpan elements should be
included in the gradient application. By default, widget spans are ignored.

[renderMode] specifies how the gradient should be applied to the text. The default
is [GradientRenderMode.fullText], meaning the gradient will apply to the entire text.

[ignoreRegex] is a regular expression used to exclude certain parts of the text
from the gradient effect. For example, it can be used to exclude specific characters
or words (like emojis or special symbols) from the gradient application.

[beforeDrawGradient] A callback function that is called before the gradient is drawn on the text.

[blendMode] The blend mode to be used when applying the gradient.
default: [BlendMode.srcIn] (i.e., the gradient will be applied to the text).
It's better to use [BlendMode.srcIn] or [BlendMode.srcATop].

GradientConfig _config = GradientConfig(
gradient: const LinearGradient(
colors: <Color>[Colors.blue, Colors.red],
),
ignoreRegex: GradientConfig.ignoreEmojiRegex,
ignoreWidgetSpan: true,
renderMode: GradientRenderMode.fullText,
);
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IgnoreGradientSpan #
The InlineSpan will always ignore the gradient.
class IgnoreGradientTextSpan extends TextSpan with IgnoreGradientSpan {
IgnoreGradientTextSpan({String? text, List<InlineSpan>? children})
: super(
text: text,
children: children,
);
}
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