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feat: handle shift keys

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This commit is contained in:
Vincent Chan 2022-07-28 15:25:19 +08:00
parent 883740d79a
commit 1d3e5a9e8b
1 changed files with 63 additions and 34 deletions
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97
frontend/app_flowy/packages/flowy_editor/lib/service/internal_key_event_handlers/arrow_keys_handler.dart
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@ -1,7 +1,5 @@
import 'package:flowy_editor/document/node.dart';
import 'package:flowy_editor/document/position.dart';
import 'package:flowy_editor/flowy_editor.dart';
import 'package:flowy_editor/service/keyboard_service.dart';
import 'package:flowy_editor/document/selection.dart';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
@ -12,14 +10,65 @@ int _endOffsetOfNode(Node node) {
return 0;
}
FlowyKeyEventHandler arrowKeysHandler = (editorState, event) {
if (event.logicalKey != LogicalKeyboardKey.arrowUp &&
event.logicalKey != LogicalKeyboardKey.arrowDown &&
event.logicalKey != LogicalKeyboardKey.arrowLeft &&
event.logicalKey != LogicalKeyboardKey.arrowRight) {
KeyEventResult _handleShiftKey(EditorState editorState, RawKeyEvent event) {
final currentSelection = editorState.cursorSelection;
if (currentSelection == null) {
return KeyEventResult.ignored;
}
if (event.logicalKey == LogicalKeyboardKey.arrowLeft) {
final leftPosition = _leftPosition(editorState, currentSelection.start);
if (leftPosition != null) {
editorState.updateCursorSelection(
Selection(start: leftPosition, end: currentSelection.end));
}
return KeyEventResult.handled;
} else if (event.logicalKey == LogicalKeyboardKey.arrowRight) {
final rightPosition = _rightPosition(editorState, currentSelection.end);
if (rightPosition != null) {
editorState.updateCursorSelection(
Selection(start: currentSelection.start, end: rightPosition));
}
return KeyEventResult.handled;
}
return KeyEventResult.ignored;
}
Position? _leftPosition(EditorState editorState, Position position) {
final offset = position.offset;
if (offset == 0) {
final node = editorState.document.nodeAtPath(position.path)!;
final prevNode = node.previous;
if (prevNode != null) {
editorState.updateCursorSelection(Selection.collapsed(
Position(path: prevNode.path, offset: _endOffsetOfNode(prevNode))));
}
return null;
}
return Position(path: position.path, offset: offset - 1);
}
Position? _rightPosition(EditorState editorState, Position position) {
final offset = position.offset;
final node = editorState.document.nodeAtPath(position.path)!;
final lengthOfNode = _endOffsetOfNode(node);
if (offset >= lengthOfNode) {
final nextNode = node.next;
if (nextNode != null) {
Position(path: nextNode.path, offset: 0);
}
return null;
}
return Position(path: position.path, offset: offset + 1);
}
FlowyKeyEventHandler arrowKeysHandler = (editorState, event) {
if (event.isShiftPressed) {
return _handleShiftKey(editorState, event);
}
final currentSelection = editorState.cursorSelection;
if (currentSelection == null) {
return KeyEventResult.ignored;
@ -27,19 +76,10 @@ FlowyKeyEventHandler arrowKeysHandler = (editorState, event) {
if (event.logicalKey == LogicalKeyboardKey.arrowLeft) {
if (currentSelection.isCollapsed) {
final end = currentSelection.end;
final offset = end.offset;
if (offset == 0) {
final node = editorState.document.nodeAtPath(end.path)!;
final prevNode = node.previous;
if (prevNode != null) {
editorState.updateCursorSelection(Selection.collapsed(Position(
path: prevNode.path, offset: _endOffsetOfNode(prevNode))));
}
return KeyEventResult.handled;
final leftPosition = _leftPosition(editorState, currentSelection.start);
if (leftPosition != null) {
editorState.updateCursorSelection(Selection.collapsed(leftPosition));
}
editorState.updateCursorSelection(
Selection.collapsed(Position(path: end.path, offset: offset - 1)));
} else {
editorState
.updateCursorSelection(currentSelection.collapse(atStart: true));
@ -47,21 +87,10 @@ FlowyKeyEventHandler arrowKeysHandler = (editorState, event) {
return KeyEventResult.handled;
} else if (event.logicalKey == LogicalKeyboardKey.arrowRight) {
if (currentSelection.isCollapsed) {
final end = currentSelection.end;
final offset = end.offset;
final node = editorState.document.nodeAtPath(end.path)!;
final lengthOfNode = _endOffsetOfNode(node);
if (offset >= lengthOfNode) {
final nextNode = node.next;
if (nextNode != null) {
editorState.updateCursorSelection(
Selection.collapsed(Position(path: nextNode.path, offset: 0)));
}
return KeyEventResult.handled;
final rightPosition = _rightPosition(editorState, currentSelection.end);
if (rightPosition != null) {
editorState.updateCursorSelection(Selection.collapsed(rightPosition));
}
editorState.updateCursorSelection(
Selection.collapsed(Position(path: end.path, offset: offset + 1)));
} else {
editorState.updateCursorSelection(currentSelection.collapse());
}