Segment display widget

Segment display

Pub Build Status

Segment display widget for Flutter. Supports multiple types of segment displays and segment customization.

Contents

Features

  • 7-segment display
  • 14-segment display
  • 16-segment display
  • Customizable segment shapes (segment styles)

Planned

  • Support for decimal point (.)
  • Support for colons (:)

Installation

  1. Depend on it

Add this to your package's pubspec.yaml file:

dependencies:
  segment_display: ^0.3.0
  1. Install it

You can install packages from the command line:

$ flutter packages get

Alternatively, your editor might support flutter packages get. Check the docs for your editor to learn more.

  1. Import it

Now in your Dart code, you can use:

import 'package:segment_display/segment_display.dart';

Usage

Seven-segment display

SevenSegmentDisplay(
  text: "123",
  textSize: 12.0,
);

Fourteen-segment display

FourteenSegmentDisplay(
  text: "123",
  textSize: 12.0,
);

Sixteen-segment display

SixteenSegmentDisplay(
  text: "123",
  textSize: 12.0,
);

Styles and customization

You can customize segment display with:

  • characterSpacing- space between individual characters
  • backgroundColor - display background color
  • segmentStyle - style for segments (shape, color,...), see segment style

Example:

SevenSegmentDisplay(
  text: "123",
  textSize: 12.0,
  characterSpacing: 10.0,
  backgroundColor: Colors.transparent,
  segmentStyle: HexSegmentStyle(
    enabledColor: Colors.red,
    disabledColor: Colors.red.withOpacity(0.15),
  ),
);

Segment style

To change segment color, size or shape, use segment style.

There are following segment styles:

  • DefaultSegmentStyle
  • HexSegmentStyle
  • RectSegmentStyle

and you can also create or own style (shape) - see custom segment styles

Example:

SevenSegmentDisplay(
  text: "123",
  textSize: 12.0,
  segmentStyle: HexSegmentStyle(
    enabledColor: Colors.red,
    disabledColor: Colors.red.withOpacity(0.15),
    segmentBaseSize: const Size(1.0, 4.0),
  ),
);
  • enabledColor - color of enabled segments
  • disabledColor - color of disabled segments
  • segmentBaseSize - size ratio for segments; Size(1.0, 4.0) basically means that ratio will be 1:4 (width:length)

NOTE: SegmentStyle.segmentBaseSize * SegmentDisplay.textSize = segmentSize

Custom segment styles

To create your own segment style (shape), extends SegmentStyle class and implement methods createHorizontalPath, createVerticalPath, createDiagonalBackwardPath and createDiagonalForwardPath.

class CustomSegmentStyle extends SegmentStyle {

  const RectSegmentStyle({
    Size segmentBaseSize,
    Color enabledColor,
    Color disabledColor,
  }) : super(
          segmentBaseSize: segmentBaseSize,
          enabledColor: enabledColor,
          disabledColor: disabledColor,
        );
  @override
  Path createHorizontalPath(SegmentPosition position, Size segmentSize) {
    // ...
  }
  
  @override
  Path createVerticalPath(SegmentPosition position, Size segmentSize) {
    // ...
  }
  
  @override
  Path createDiagonalBackwardPath(SegmentPosition position, Size segmentSize) {
    // ...
  }
  
  @override
  Path createDiagonalForwardPath(SegmentPosition position, Size segmentSize) {
    // ...
  }
}

You can also customize shape for individual segments by overriding createPath** methods. For 7-segment display, there are createPath7* methods, for 14-segment display createPath14* and so on.

Example: if you want to change the shape of the top segment in 7-segment display, you just have to override createPath7A method.

class CustomSegmentStyle extends SegmentStyle {

  // ..
  
  @override
  Path createPath7A(Size segmentSize, double padding) {
    // ...
  }
  
  // ...
  
}

NOTE: createPath** methods use createHorizontalPath/createVerticalPath/createDiagonalBackwardPath/createDiagonalForwardPath by default so you don't have to override all createPath7* methods.

Features and bugs

Please file feature requests and bugs at the issue tracker.

Libraries

segment_display