Extended official text field to build special text like inline image, @somebody, custom background etc quickly.It also support to build custom seleciton toolbar and handles.
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Not support: it won't handle special text when TextDirection.rtl.
Image position calculated by TextPainter is strange.
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Not support:it won't handle special text when obscureText is true.
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 {
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);
}));
}
}
create your SpecialTextSpanBuilder
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;
}
}
show inline image by using ImageSpan.
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));
}| 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 |
if you want cache the network image, you can use ExtendedNetworkImageProvider and clear them with clearDiskCachedImages
import 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();| parameter | description | default |
|---|---|---|
| url | The URL from which the image will be fetched. | required |
| scale | The scale to place in the [ImageInfo] object of the image. | 1.0 |
| headers | The HTTP headers that will be used with [HttpClient.get] to fetch image from network. | - |
| cache | whether cache image to local | false |
| retries | the time to retry to request | 3 |
| timeLimit | time limit to request image | - |
| timeRetry | the time duration to retry to request | milliseconds: 100 |
| cancelToken | token to cancel network request | 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
default value of textSelectionControls are MaterialExtendedTextSelectionControls/CupertinoExtendedTextSelectionControls
override buildToolbar or buildHandle to custom your toolbar widget or handle widget
class MyExtendedMaterialTextSelectionControls
extends MaterialExtendedTextSelectionControls {
MyExtendedMaterialTextSelectionControls();
@override
Widget buildToolbar(
BuildContext context,
Rect globalEditableRegion,
double textLineHeight,
Offset position,
List<TextSelectionPoint> endpoints,
TextSelectionDelegate delegate,
) {
assert(debugCheckHasMediaQuery(context));
assert(debugCheckHasMaterialLocalizations(context));
// The toolbar should appear below the TextField
// when there is not enough space above the TextField to show it.
final TextSelectionPoint startTextSelectionPoint = endpoints[0];
final TextSelectionPoint endTextSelectionPoint =
(endpoints.length > 1) ? endpoints[1] : null;
final double x = (endTextSelectionPoint == null)
? startTextSelectionPoint.point.dx
: (startTextSelectionPoint.point.dx + endTextSelectionPoint.point.dx) /
2.0;
final double availableHeight = globalEditableRegion.top -
MediaQuery.of(context).padding.top -
_kToolbarScreenPadding;
final double y = (availableHeight < _kToolbarHeight)
? startTextSelectionPoint.point.dy +
globalEditableRegion.height +
_kToolbarHeight +
_kToolbarScreenPadding
: startTextSelectionPoint.point.dy - textLineHeight * 2.0;
final Offset preciseMidpoint = Offset(x, y);
return ConstrainedBox(
constraints: BoxConstraints.tight(globalEditableRegion.size),
child: CustomSingleChildLayout(
delegate: MaterialExtendedTextSelectionToolbarLayout(
MediaQuery.of(context).size,
globalEditableRegion,
preciseMidpoint,
),
child: _TextSelectionToolbar(
handleCut: canCut(delegate) ? () => handleCut(delegate) : null,
handleCopy: canCopy(delegate) ? () => handleCopy(delegate) : null,
handlePaste: canPaste(delegate) ? () => handlePaste(delegate) : null,
handleSelectAll:
canSelectAll(delegate) ? () => handleSelectAll(delegate) : null,
handleLike: () {
//mailto:<email address>?subject=<subject>&body=<body>, e.g.
launch(
"mailto:[email protected]?subject=extended_text_share&body=${delegate.textEditingValue.text}");
delegate.hideToolbar();
//clear selecction
delegate.textEditingValue = delegate.textEditingValue.copyWith(
selection: TextSelection.collapsed(
offset: delegate.textEditingValue.selection.end));
},
),
),
);
}
@override
Widget buildHandle(
BuildContext context, TextSelectionHandleType type, double textHeight) {
final Widget handle = SizedBox(
width: _kHandleSize,
height: _kHandleSize,
child: Image.asset("assets/love.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;
}
assert(type != null);
return null;
}
}
/// Manages a copy/paste text selection toolbar.
class _TextSelectionToolbar extends StatelessWidget {
const _TextSelectionToolbar({
Key key,
this.handleCopy,
this.handleSelectAll,
this.handleCut,
this.handlePaste,
this.handleLike,
}) : super(key: key);
final VoidCallback handleCut;
final VoidCallback handleCopy;
final VoidCallback handlePaste;
final VoidCallback handleSelectAll;
final VoidCallback handleLike;
@override
Widget build(BuildContext context) {
final List<Widget> items = <Widget>[];
final MaterialLocalizations localizations =
MaterialLocalizations.of(context);
if (handleCut != null)
items.add(FlatButton(
child: Text(localizations.cutButtonLabel), onPressed: handleCut));
if (handleCopy != null)
items.add(FlatButton(
child: Text(localizations.copyButtonLabel), onPressed: handleCopy));
if (handlePaste != null)
items.add(FlatButton(
child: Text(localizations.pasteButtonLabel),
onPressed: handlePaste,
));
if (handleSelectAll != null)
items.add(FlatButton(
child: Text(localizations.selectAllButtonLabel),
onPressed: handleSelectAll));
if (handleLike != null)
items.add(FlatButton(child: Icon(Icons.favorite), onPressed: handleLike));
// If there is no option available, build an empty widget.
if (items.isEmpty) {
return Container(width: 0.0, height: 0.0);
}
return Material(
elevation: 1.0,
child: Wrap(children: items),
borderRadius: BorderRadius.all(Radius.circular(10.0)),
);
}
}
support to select and hitTest ExtendedWidgetSpan, you can create any widget in ExtendedTextField.
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,
);
}
}