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docs: add documentation for selectable

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Lucas.Xu 2022-08-16 18:34:37 +08:00
parent 35d5bc92ac
commit 2c2127e84a
1 changed files with 24 additions and 11 deletions
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35
frontend/app_flowy/packages/flowy_editor/lib/src/render/selection/selectable.dart
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@ -2,33 +2,40 @@ import 'package:flowy_editor/src/document/position.dart';
import 'package:flowy_editor/src/document/selection.dart';
import 'package:flutter/material.dart';
/// [Selectable] is used for the editor to calculate the position
/// and size of the selection.
///
/// The widget returned by NodeWidgetBuilder must be with [Selectable],
/// otherwise the [FlowySelectionService] will not work properly.
///
mixin Selectable<T extends StatefulWidget> on State<T> {
/// Returns a [List] of the [Rect] selection surrounded by start and end
/// Returns the [Selection] surrounded by start and end
/// in current widget.
///
/// [start] and [end] are the offsets under the global coordinate system.
///
/// The return result must be a [List] of the [Rect]
/// under the local coordinate system.
Selection getSelectionInRange(Offset start, Offset end);
/// Returns a [List] of the [Rect] area within selection
/// in current widget.
///
/// The return result must be a [List] of the [Rect]
/// under the local coordinate system.
List<Rect> getRectsInSelection(Selection selection);
/// Returns a [Rect] for the offset in current widget.
/// Returns [Position] for the offset in current widget.
///
/// [start] is the offset of the global coordination system.
Position getPositionInOffset(Offset start);
/// Returns [Rect] for the position in current widget.
///
/// The return result must be an offset of the local coordinate system.
Position getPositionInOffset(Offset start);
Selection? getWorldBoundaryInOffset(Offset start) {
return null;
}
Rect? getCursorRectInPosition(Position position) {
return null;
}
/// Return global offset from local offset.
Offset localToGlobal(Offset offset);
Position start();
@ -36,9 +43,15 @@ mixin Selectable<T extends StatefulWidget> on State<T> {
/// For [TextNode] only.
///
/// Returns a [TextSelection] or [Null].
///
/// Only the widget rendered by [TextNode] need to implement the detail,
/// and the rest can return null.
TextSelection? getTextSelectionInSelection(Selection selection) => null;
/// For [TextNode] only.
///
/// Only the widget rendered by [TextNode] need to implement the detail,
/// and the rest can return null.
Selection? getWorldBoundaryInOffset(Offset start) {
return null;
}
}