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example added in git ignore
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‎.gitignore‎

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@@ -33,6 +33,7 @@ getflutter-app-kit
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getflutter-web-kit
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getflutter_app
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test/.test_coverage.dart
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example
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# Android related
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**/android/**/gradle-wrapper.jar

‎lib/components/slidable/gf_fractionally_aligned_sized_box.dart‎

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//import 'package:flutter/widgets.dart';
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//
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///// A widget that positions its child to a fraction of the total available space.
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//class FractionallyAlignedSizedBox extends StatelessWidget {
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// /// Creates a widget that positions its child to a fraction of the total available space.
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// ///
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// /// Only two out of the three horizontal values ([leftFactor], [rightFactor],
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// /// [widthFactor]), and only two out of the three vertical values ([topFactor],
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// /// [bottomFactor], [heightFactor]), can be set. In each case, at least one of
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// /// the three must be null.
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// ///
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// /// If non-null, the [widthFactor] and [heightFactor] arguments must be
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// /// non-negative.
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// FractionallyAlignedSizedBox({
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// Key key,
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// @required this.child,
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// this.leftFactor,
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// this.topFactor,
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// this.rightFactor,
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// this.bottomFactor,
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// this.widthFactor,
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// this.heightFactor,
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// }) : assert(
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// leftFactor == null || rightFactor == null || widthFactor == null),
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// assert(
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// topFactor == null || bottomFactor == null || heightFactor == null),
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// assert(widthFactor == null || widthFactor >= 0.0),
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// assert(heightFactor == null || heightFactor >= 0.0),
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// super(key: key);
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//
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// /// The relative distance that the child's left edge is inset from the left of the parent.
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// final double leftFactor;
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//
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// /// The relative distance that the child's top edge is inset from the top of the parent.
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// final double topFactor;
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//
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// /// The relative distance that the child's right edge is inset from the right of the parent.
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// final double rightFactor;
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//
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// /// The relative distance that the child's bottom edge is inset from the bottom of the parent.
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// final double bottomFactor;
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//
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// /// The child's width relative to its parent's width.
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// final double widthFactor;
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//
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// /// The child's height relative to its parent's height.
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// final double heightFactor;
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//
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// /// The widget below this widget in the tree.
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// final Widget child;
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//
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// @override
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// Widget build(BuildContext context) {
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// double dx = 0;
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// double dy = 0;
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// double width = widthFactor;
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// double height = heightFactor;
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//
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// if (widthFactor == null) {
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// final left = leftFactor ?? 0;
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// final right = rightFactor ?? 0;
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// width = 1 - left - right;
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//
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// if (width != 1) {
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// dx = left / (1.0 - width);
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// }
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// }
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//
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// if (heightFactor == null) {
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// final top = topFactor ?? 0;
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// final bottom = bottomFactor ?? 0;
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// height = 1 - top - bottom;
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// if (height != 1) {
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// dy = top / (1.0 - height);
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// }
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// }
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//
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// if (widthFactor != null && widthFactor != 1) {
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// if (leftFactor != null) {
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// dx = leftFactor / (1 - widthFactor);
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// } else if (leftFactor == null && rightFactor != null) {
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// dx = (1 - widthFactor - rightFactor) / (1 - widthFactor);
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// }
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// }
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//
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// if (heightFactor != null && heightFactor != 1) {
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// if (topFactor != null) {
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// dy = topFactor / (1 - heightFactor);
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// } else if (topFactor == null && bottomFactor != null) {
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// dy = (1 - heightFactor - bottomFactor) / (1 - heightFactor);
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// }
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// }
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//
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// return Align(
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// alignment: FractionalOffset(
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// dx,
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// dy,
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// ),
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// child: FractionallySizedBox(
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// widthFactor: width,
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// heightFactor: height,
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// child: child,
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// ),
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// );
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// }
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//}
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import 'package:flutter/widgets.dart';
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3+
/// A widget that positions its child to a fraction of the total available space.
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class FractionallyAlignedSizedBox extends StatelessWidget {
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/// Creates a widget that positions its child to a fraction of the total available space.
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///
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/// Only two out of the three horizontal values ([leftFactor], [rightFactor],
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/// [widthFactor]), and only two out of the three vertical values ([topFactor],
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/// [bottomFactor], [heightFactor]), can be set. In each case, at least one of
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/// the three must be null.
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///
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/// If non-null, the [widthFactor] and [heightFactor] arguments must be
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/// non-negative.
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FractionallyAlignedSizedBox({
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Key key,
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@required this.child,
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this.leftFactor,
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this.topFactor,
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this.rightFactor,
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this.bottomFactor,
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this.widthFactor,
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this.heightFactor,
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}) : assert(
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leftFactor == null || rightFactor == null || widthFactor == null),
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assert(
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topFactor == null || bottomFactor == null || heightFactor == null),
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assert(widthFactor == null || widthFactor >= 0.0),
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assert(heightFactor == null || heightFactor >= 0.0),
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super(key: key);
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/// The relative distance that the child's left edge is inset from the left of the parent.
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final double leftFactor;
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/// The relative distance that the child's top edge is inset from the top of the parent.
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final double topFactor;
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/// The relative distance that the child's right edge is inset from the right of the parent.
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final double rightFactor;
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/// The relative distance that the child's bottom edge is inset from the bottom of the parent.
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final double bottomFactor;
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/// The child's width relative to its parent's width.
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final double widthFactor;
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/// The child's height relative to its parent's height.
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final double heightFactor;
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/// The widget below this widget in the tree.
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final Widget child;
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@override
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Widget build(BuildContext context) {
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double dx = 0;
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double dy = 0;
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double width = widthFactor;
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double height = heightFactor;
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if (widthFactor == null) {
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final left = leftFactor ?? 0;
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final right = rightFactor ?? 0;
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width = 1 - left - right;
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if (width != 1) {
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dx = left / (1.0 - width);
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}
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}
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if (heightFactor == null) {
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final top = topFactor ?? 0;
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final bottom = bottomFactor ?? 0;
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height = 1 - top - bottom;
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if (height != 1) {
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dy = top / (1.0 - height);
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}
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}
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if (widthFactor != null && widthFactor != 1) {
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if (leftFactor != null) {
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dx = leftFactor / (1 - widthFactor);
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} else if (leftFactor == null && rightFactor != null) {
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dx = (1 - widthFactor - rightFactor) / (1 - widthFactor);
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}
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}
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if (heightFactor != null && heightFactor != 1) {
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if (topFactor != null) {
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dy = topFactor / (1 - heightFactor);
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} else if (topFactor == null && bottomFactor != null) {
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dy = (1 - heightFactor - bottomFactor) / (1 - heightFactor);
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}
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}
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return Align(
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alignment: FractionalOffset(
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dx,
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dy,
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),
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child: FractionallySizedBox(
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widthFactor: width,
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heightFactor: height,
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child: child,
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),
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);
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}
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}

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