extended_text 0.6.8

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.

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.

Table of contents

• extended_text
  • Table of contents
  • Speical Text
    • Create Speical Text
    • SpecialTextSpanBuilder
  • Image
    • ImageSpan
    • Cache Image
  • Selection
    • TextSelectionControls
    • Control ToolBar Handle
      • Default Behavior
      • Custom Behavior
  • Custom Background
  • Custom Overflow

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 {
  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);
              }));
  }
}

SpecialTextSpanBuilder

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;
  }
}

more detail

Image

ImageSpan

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

Cache Image

if you want cache the network image, you can use ExtendedNetworkImageProvider and clear them with clearDiskCachedImages

import extended_image_library

dependencies:
  extended_image_library: ^0.1.4

ExtendedNetworkImageProvider(
  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

more detail

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

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:[e-mail]?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)),
    );
  }
}

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,
    );

• 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();
            }
          },
        );
      },
    );

more detail

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))),

parameter	description	default
background	Background painter	-
clipBorderRadius	Clip BorderRadius	-
paintBackground	Paint background call back, you can paint background by self	-

more detail

Custom Overflow

refer to issue 26748

  ExtendedText(...
      overFlowTextSpan: OverFlowTextSpan(children: <TextSpan>[
              TextSpan(text: '  \u2026  '),
              TextSpan(
                  text: "more detail",
                  style: TextStyle(
                    color: Colors.blue,
                  ),
                  recognizer: TapGestureRecognizer()
                    ..onTap = () {
                      launch(
                          "https://github.com/fluttercandies/extended_text");
                    })
            ]),
            ...
          )

more detail