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refactor: from node traverser to node iterator

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This commit is contained in:
Vincent Chan 2022-08-04 10:53:41 +08:00
parent 061168bd82
commit 2eecda0483
3 changed files with 68 additions and 49 deletions
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64
frontend/app_flowy/packages/flowy_editor/lib/document/node_iterator.dart Normal file
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@ -0,0 +1,64 @@
import 'package:flowy_editor/document/node.dart';
import './state_tree.dart';
import './node.dart';
/// [NodeIterator] is used to traverse the nodes in visual order.
class NodeIterator implements Iterator<Node> {
final StateTree stateTree;
final Node _startNode;
final Node? _endNode;
Node? _currentNode;
bool _began = false;
NodeIterator(this.stateTree, Node startNode, [Node? endNode])
: _startNode = startNode,
_endNode = endNode;
@override
bool moveNext() {
if (!_began) {
_currentNode = _startNode;
_began = true;
return true;
}
final node = _currentNode;
if (node == null) {
return false;
}
if (_endNode != null && _endNode == node) {
_currentNode = null;
return false;
}
if (node.children.isNotEmpty) {
_currentNode = _findLeadingChild(node);
} else if (node.next != null) {
_currentNode = node.next!;
} else {
final parent = node.parent!;
final nextOfParent = parent.next;
if (nextOfParent == null) {
_currentNode = null;
} else {
_currentNode = _findLeadingChild(node);
}
}
return _currentNode != null;
}
Node _findLeadingChild(Node node) {
while (node.children.isNotEmpty) {
node = node.children.first;
}
return node;
}
@override
Node get current {
return _currentNode!;
}
}

42
frontend/app_flowy/packages/flowy_editor/lib/document/node_traverser.dart
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@ -1,42 +0,0 @@
import 'package:flowy_editor/document/node.dart';
import './state_tree.dart';
import './node.dart';
/// [NodeTraverser] is used to traverse the nodes in visual order.
class NodeTraverser {
final StateTree stateTree;
Node? currentNode;
NodeTraverser(this.stateTree, Node beginNode) : currentNode = beginNode;
Node? next() {
final node = currentNode;
if (node == null) {
return null;
}
if (node.children.isNotEmpty) {
currentNode = _findLeadingChild(node);
} else if (node.next != null) {
currentNode = node.next!;
} else {
final parent = node.parent!;
final nextOfParent = parent.next;
if (nextOfParent == null) {
currentNode = null;
} else {
currentNode = _findLeadingChild(node);
}
}
return node;
}
Node _findLeadingChild(Node node) {
while (node.children.isNotEmpty) {
node = node.children.first;
}
return node;
}
}

11
frontend/app_flowy/packages/flowy_editor/lib/service/internal_key_event_handlers/copy_paste_handler.dart
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@ -1,7 +1,7 @@
import 'package:flowy_editor/flowy_editor.dart';
import 'package:flowy_editor/service/keyboard_service.dart';
import 'package:flowy_editor/infra/html_converter.dart';
import 'package:flowy_editor/document/node_traverser.dart';
import 'package:flowy_editor/document/node_iterator.dart';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:rich_clipboard/rich_clipboard.dart';
@ -29,11 +29,11 @@ _handleCopy(EditorState editorState) async {
final beginNode = editorState.document.nodeAtPath(selection.start.path)!;
final endNode = editorState.document.nodeAtPath(selection.end.path)!;
final traverser = NodeTraverser(editorState.document, beginNode);
final traverser = NodeIterator(editorState.document, beginNode, endNode);
var copyString = "";
while (traverser.currentNode != null) {
final node = traverser.next()!;
while (traverser.moveNext()) {
final node = traverser.current;
if (node.type == "text") {
final textNode = node as TextNode;
if (node == beginNode) {
@ -51,9 +51,6 @@ _handleCopy(EditorState editorState) async {
}
// TODO: handle image and other blocks
if (node == endNode) {
break;
}
}
debugPrint('copy html: $copyString');
RichClipboard.setData(RichClipboardData(html: copyString));