| // Copyright 2014 The Flutter Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| import 'dart:math' as math; |
| import 'dart:math'; |
| |
| import 'package:flutter/gestures.dart'; |
| import 'package:flutter/material.dart'; |
| import 'package:flutter/rendering.dart'; |
| |
| typedef Painter = void Function(Canvas canvas, Rect rect); |
| |
| typedef LatticeTapCallback = void Function(Offset? offset); |
| |
| /// A cell in a [LatticeScrollView]. |
| @immutable |
| class LatticeCell extends _LatticeCell { |
| const LatticeCell({ |
| super.painter, |
| this.builder, |
| super.onTap, |
| this.taskName, |
| }); |
| |
| final WidgetBuilder? builder; |
| |
| final String? taskName; |
| |
| @override |
| bool get hasChild => builder != null; |
| } |
| |
| /// A bidirectional scrollable view that draws arrays of arrays of [LatticeCell]s. |
| /// |
| /// Only the [cells] that are visible are drawn. |
| /// |
| /// The cells will be sized according to [cellSize]. |
| class LatticeScrollView extends StatelessWidget { |
| const LatticeScrollView({ |
| super.key, |
| this.horizontalPhysics, |
| this.horizontalController, |
| this.textDirection, |
| this.verticalPhysics, |
| this.verticalController, |
| this.dragStartBehavior = DragStartBehavior.start, |
| required this.cells, |
| required this.cellSize, |
| }); |
| |
| final ScrollPhysics? horizontalPhysics; |
| |
| final ScrollController? horizontalController; |
| |
| final TextDirection? textDirection; |
| |
| final ScrollPhysics? verticalPhysics; |
| |
| final ScrollController? verticalController; |
| |
| final DragStartBehavior dragStartBehavior; |
| |
| final List<List<LatticeCell>> cells; |
| |
| final Size cellSize; |
| |
| @override |
| Widget build(BuildContext context) { |
| final TextDirection textDirection = this.textDirection ?? Directionality.of(context); |
| return Scrollbar( |
| controller: horizontalController, |
| thumbVisibility: true, |
| child: Scrollable( |
| dragStartBehavior: dragStartBehavior, |
| axisDirection: textDirectionToAxisDirection(textDirection), |
| controller: horizontalController, |
| physics: horizontalPhysics, |
| scrollBehavior: _MouseDragScrollBehavior.instance, |
| viewportBuilder: (BuildContext context, ViewportOffset horizontalOffset) => |
| NotificationListener<OverscrollNotification>( |
| onNotification: (notification) => |
| notification.metrics.axisDirection != AxisDirection.right && |
| notification.metrics.axisDirection != AxisDirection.left, |
| child: _FakeViewport( |
| child: Scrollbar( |
| thumbVisibility: true, |
| controller: verticalController, |
| child: Scrollable( |
| dragStartBehavior: dragStartBehavior, |
| axisDirection: AxisDirection.down, |
| controller: verticalController, |
| physics: verticalPhysics, |
| scrollBehavior: _MouseDragScrollBehavior.instance, |
| viewportBuilder: (BuildContext context, ViewportOffset verticalOffset) => _FakeViewport( |
| child: _LatticeBody( |
| textDirection: textDirection, |
| horizontalOffset: horizontalOffset, |
| verticalOffset: verticalOffset, |
| cells: cells, |
| cellSize: cellSize, |
| ), |
| ), |
| ), |
| ), |
| ), |
| ), |
| ), |
| ); |
| } |
| } |
| |
| class _FakeViewport extends SingleChildRenderObjectWidget { |
| const _FakeViewport({ |
| super.child, |
| }); |
| |
| @override |
| _RenderFakeViewport createRenderObject(BuildContext context) => _RenderFakeViewport(); |
| } |
| |
| class _RenderFakeViewport extends RenderProxyBox implements RenderAbstractViewport { |
| _RenderFakeViewport({ |
| RenderBox? child, |
| }) : super(child); |
| |
| @override |
| RevealedOffset getOffsetToReveal(RenderObject target, double alignment, {Rect? rect}) { |
| // TODO(ianh): Implement this for real (and make these not be "Fake") |
| return RevealedOffset(offset: 0.0, rect: rect ?? target.paintBounds); |
| } |
| } |
| |
| /// Used to mark classes that would be made public if the rendering object side |
| /// of this contraption is ever made public. |
| const Object _public = Object(); |
| |
| @_public |
| class _LatticeBody extends RenderObjectWidget { |
| const _LatticeBody({ |
| required this.textDirection, |
| required this.horizontalOffset, |
| required this.verticalOffset, |
| required this.cells, |
| required this.cellSize, |
| }); |
| |
| final TextDirection textDirection; |
| final ViewportOffset horizontalOffset; |
| final ViewportOffset verticalOffset; |
| final List<List<LatticeCell>> cells; |
| final Size cellSize; |
| |
| @override |
| _RenderLatticeBody createRenderObject(BuildContext context) { |
| return _RenderLatticeBody( |
| textDirection: textDirection, |
| horizontalOffset: horizontalOffset, |
| verticalOffset: verticalOffset, |
| cells: cells, |
| cellSize: cellSize, |
| delegate: context as _LatticeBodyElement, |
| ); |
| } |
| |
| @override |
| void updateRenderObject(BuildContext context, _RenderLatticeBody renderObject) { |
| renderObject |
| ..textDirection = textDirection |
| ..horizontalOffset = horizontalOffset |
| ..verticalOffset = verticalOffset |
| ..cells = cells |
| ..cellSize = cellSize |
| ..delegate = context as _LatticeBodyElement; |
| } |
| |
| @override |
| RenderObjectElement createElement() => _LatticeBodyElement(this); |
| } |
| |
| @_public |
| class _LatticeBodyElement extends RenderObjectElement implements _LatticeDelegate { |
| _LatticeBodyElement(_LatticeBody super.widget); |
| |
| @override |
| _LatticeBody get widget => super.widget as _LatticeBody; |
| |
| @override |
| _RenderLatticeBody get renderObject => super.renderObject as _RenderLatticeBody; |
| |
| // This element uses _Coordinate objects as slots. |
| |
| Map<Key?, Element?> _newChildrenByKey = <Key?, Element?>{}; |
| Map<Key?, Element?>? _oldChildrenByKey; |
| Map<_Coordinate, Element?> _newChildrenByCoordinate = <_Coordinate, Element?>{}; |
| Map<_Coordinate, Element?>? _oldChildrenByCoordinate; |
| |
| @override |
| void beginLayout() { |
| _oldChildrenByKey = _newChildrenByKey; |
| _newChildrenByKey = <Key?, Element?>{}; |
| _oldChildrenByCoordinate = _newChildrenByCoordinate; |
| _newChildrenByCoordinate = <_Coordinate, Element?>{}; |
| } |
| |
| @override |
| RenderBox? updateLatticeChild(_Coordinate coordinate, LatticeCell cell, RenderBox? oldChild) { |
| Widget? newWidget; |
| Element? newElement; |
| owner!.buildScope(this, () { |
| try { |
| newWidget = cell.builder!(this); |
| debugWidgetBuilderValue(widget, newWidget); |
| } catch (exception, stack) { |
| newWidget = ErrorWidget.builder( |
| _debugReportException( |
| FlutterErrorDetails( |
| context: ErrorDescription('building cell $coordinate for $widget'), |
| exception: exception, |
| stack: stack, |
| library: 'Flutter Dashboard', |
| informationCollector: () sync* { |
| yield DiagnosticsDebugCreator(DebugCreator(this)); |
| }, |
| ), |
| ), |
| ); |
| } |
| Element? oldElement; |
| if (newWidget!.key != null) { |
| oldElement = _oldChildrenByKey![newWidget!.key]; |
| if (oldElement != null) { |
| _oldChildrenByKey![newWidget!.key] = null; // null indicates it exists but is not in the grid |
| _oldChildrenByCoordinate!.remove(oldElement.slot as _Coordinate?); |
| } |
| } else { |
| oldElement = _oldChildrenByCoordinate![coordinate]; |
| if (oldElement != null && oldElement.widget.key != null) { |
| oldElement = null; |
| } |
| _oldChildrenByCoordinate!.remove(coordinate); |
| } |
| try { |
| newElement = updateChild(oldElement, newWidget, coordinate); |
| } catch (e, stack) { |
| newWidget = ErrorWidget.builder( |
| _debugReportException( |
| FlutterErrorDetails( |
| context: ErrorDescription('building widget $newWidget at cell $coordinate for $widget'), |
| exception: e, |
| stack: stack, |
| library: 'Flutter Dashboard', |
| informationCollector: () sync* { |
| yield DiagnosticsDebugCreator(DebugCreator(this)); |
| }, |
| ), |
| ), |
| ); |
| newElement = updateChild(null, newWidget, slot); |
| } |
| }); |
| assert(newElement!.slot == coordinate); |
| if (newWidget!.key != null) { |
| _newChildrenByKey[newWidget!.key] = newElement; |
| } |
| _newChildrenByCoordinate[coordinate] = newElement; |
| return newElement!.renderObject as RenderBox?; |
| } |
| |
| @override |
| void endLayout() { |
| for (final Element? oldChild in _oldChildrenByCoordinate!.values) { |
| if (oldChild!.widget.key == null) { |
| updateChild(oldChild, null, null); |
| } |
| } |
| for (final Element? oldChild in _oldChildrenByKey!.values) { |
| updateChild(oldChild, null, null); |
| } |
| _oldChildrenByKey = null; |
| _oldChildrenByCoordinate = null; |
| } |
| |
| @override |
| void forgetChild(Element child) { |
| if (child.widget.key != null) { |
| _newChildrenByKey.remove(child.widget.key); |
| } |
| _newChildrenByCoordinate.remove(child.slot as _Coordinate?); |
| super.forgetChild(child); |
| } |
| |
| @override |
| void insertRenderObjectChild(RenderObject child, _Coordinate? slot) { |
| renderObject.placeChild(null, slot, null, child as RenderBox); |
| } |
| |
| @override |
| void moveRenderObjectChild(RenderObject child, _Coordinate? oldSlot, _Coordinate? newSlot) { |
| renderObject.placeChild(oldSlot, newSlot, child as RenderBox?, child as RenderBox); |
| } |
| |
| @override |
| void removeRenderObjectChild(RenderObject child, _Coordinate? slot) { |
| renderObject.removeChild(slot, child as RenderBox); |
| } |
| |
| @override |
| void visitChildren(ElementVisitor visitor) { |
| (_newChildrenByCoordinate.values.whereType<Element>().toList()..sort(_compareChildren)).forEach(visitor); |
| } |
| |
| int _compareChildren(Element a, Element b) { |
| final _Coordinate aSlot = a.slot as _Coordinate; |
| final _Coordinate bSlot = b.slot as _Coordinate; |
| return aSlot.compareTo(bSlot); |
| } |
| |
| @override |
| List<DiagnosticsNode> debugDescribeChildren() { |
| final List<Element> children = _newChildrenByCoordinate.values.whereType<Element>().toList() |
| ..sort(_compareChildren); |
| return children.map((Element? child) { |
| return child!.toDiagnosticsNode(name: child.slot != null ? '${child.slot}' : '(lost)'); |
| }).toList(); |
| } |
| } |
| |
| @immutable |
| @_public |
| class _Coordinate implements Comparable<_Coordinate> { |
| const _Coordinate(this.x, this.y); |
| |
| final int x; |
| |
| final int y; |
| |
| @override |
| int compareTo(_Coordinate other) { |
| if (y == other.y) { |
| return x - other.x; |
| } |
| return y - other.y; |
| } |
| |
| @override |
| bool operator ==(Object other) { |
| if (other.runtimeType != runtimeType) { |
| return false; |
| } |
| return other is _Coordinate && other.x == x && other.y == y; |
| } |
| |
| @override |
| int get hashCode => Object.hash(x, y); |
| |
| @override |
| String toString() => '($x,$y)'; |
| |
| Offset asOffset(Size cellSize) => Offset(x.toDouble() * cellSize.width, y.toDouble() * cellSize.height); |
| } |
| |
| @_public |
| class _LatticeParentData extends ParentData { |
| _Coordinate? coordinate; |
| } |
| |
| @immutable |
| @_public |
| class _LatticeCell { |
| const _LatticeCell({ |
| this.painter, |
| this.onTap, |
| }); |
| |
| static const _LatticeCell empty = _LatticeCell(); |
| |
| final Painter? painter; |
| |
| final LatticeTapCallback? onTap; |
| |
| @protected |
| bool get hasChild => false; |
| } |
| |
| @_public |
| abstract class _LatticeDelegate { |
| const _LatticeDelegate(); |
| void beginLayout(); |
| RenderBox? updateLatticeChild(_Coordinate coordinate, covariant _LatticeCell cell, RenderBox? oldChild); |
| void endLayout(); |
| } |
| |
| @_public |
| class _RenderLatticeBody extends RenderBox { |
| _RenderLatticeBody({ |
| required TextDirection textDirection, |
| required ViewportOffset horizontalOffset, |
| required ViewportOffset verticalOffset, |
| required List<List<_LatticeCell>> cells, |
| required Size cellSize, |
| required _LatticeDelegate delegate, |
| }) : assert(!cellSize.isEmpty), |
| _textDirection = textDirection, |
| _horizontalOffset = horizontalOffset, |
| _verticalOffset = verticalOffset, |
| _cells = cells, |
| _cellSize = cellSize, |
| _delegate = delegate { |
| _handleOffsetChange(); |
| _recomputeCellDimensions(); |
| } |
| |
| TextDirection get textDirection => _textDirection; |
| TextDirection _textDirection; |
| set textDirection(TextDirection value) { |
| if (value == _textDirection) { |
| return; |
| } |
| _textDirection = value; |
| markNeedsPaint(); |
| } |
| |
| ViewportOffset get horizontalOffset => _horizontalOffset; |
| ViewportOffset _horizontalOffset; |
| set horizontalOffset(ViewportOffset value) { |
| if (value == _horizontalOffset) { |
| return; |
| } |
| if (attached) { |
| _horizontalOffset.removeListener(_handleOffsetChange); |
| } |
| _horizontalOffset = value; |
| if (attached) { |
| _horizontalOffset.addListener(_handleOffsetChange); |
| } |
| _handleOffsetChange(); |
| } |
| |
| ViewportOffset get verticalOffset => _verticalOffset; |
| ViewportOffset _verticalOffset; |
| set verticalOffset(ViewportOffset value) { |
| if (value == _verticalOffset) { |
| return; |
| } |
| if (attached) { |
| _verticalOffset.removeListener(_handleOffsetChange); |
| } |
| _verticalOffset = value; |
| if (attached) { |
| _verticalOffset.addListener(_handleOffsetChange); |
| } |
| _handleOffsetChange(); |
| } |
| |
| int _cellWidthCount = 0, _cellHeightCount = 0; |
| |
| List<List<_LatticeCell>> get cells => _cells; |
| List<List<_LatticeCell>> _cells; |
| set cells(List<List<_LatticeCell>> value) { |
| if (value == _cells) { |
| return; |
| } |
| _cells = value; |
| markNeedsLayout(); |
| _recomputeCellDimensions(); |
| } |
| |
| void _recomputeCellDimensions() { |
| _cellWidthCount = cells.fold<int>(0, (int current, List<_LatticeCell> row) => math.max(current, row.length)); |
| _cellHeightCount = cells.length; |
| _handleOffsetChange(); |
| } |
| |
| Size get cellSize => _cellSize; |
| Size _cellSize; |
| set cellSize(Size value) { |
| assert(!value.isEmpty); |
| if (value == _cellSize) { |
| return; |
| } |
| _cellSize = value; |
| markNeedsLayout(); |
| } |
| |
| _LatticeDelegate get delegate => _delegate; |
| _LatticeDelegate _delegate; |
| set delegate(_LatticeDelegate value) { |
| if (value == _delegate) { |
| return; |
| } |
| _delegate = value; |
| markNeedsLayout(); |
| } |
| |
| // TODO(ianh): rather than store and paint the children directly in |
| // this render object, dynamically create _RenderLatticeTiles that |
| // handle cacheStride x cacheStride sections of the grid. This would |
| // give us more efficient scrolling since we would not need to |
| // update them. We would need to make sure to mark them all as |
| // needing layout when the list of widgets changed. |
| // |
| // Currently, we have to repaint everything when we scroll because |
| // we have no way to cache the paint in a layer. |
| |
| _LatticeCell? _getCellFor(_Coordinate coordinate) { |
| if (coordinate.y < 0 || coordinate.x < 0) { |
| return null; |
| } |
| if (coordinate.y >= cells.length) { |
| return null; |
| } |
| if (coordinate.x >= cells[coordinate.y].length) { |
| return null; |
| } |
| return cells[coordinate.y][coordinate.x]; |
| } |
| |
| bool _hasTapHandler(_Coordinate coordinate) { |
| return _getCellFor(coordinate)?.onTap != null; |
| } |
| |
| final Map<_Coordinate?, RenderBox> _childrenByCoordinate = <_Coordinate?, RenderBox>{}; |
| |
| void placeChild(_Coordinate? oldCoordinate, _Coordinate? newCoordinate, RenderBox? oldChild, RenderBox newChild) { |
| if (oldChild == newChild) { |
| return; |
| } |
| if (oldChild != null) { |
| final _LatticeParentData oldChildParentData = oldChild.parentData as _LatticeParentData; |
| oldChildParentData.coordinate = null; |
| } |
| if (oldCoordinate != null) { |
| _childrenByCoordinate.remove(oldCoordinate); |
| } |
| _childrenByCoordinate[newCoordinate] = newChild; |
| if (newChild.parent != this) { |
| adoptChild(newChild); |
| } |
| final _LatticeParentData newChildParentData = newChild.parentData as _LatticeParentData; |
| newChildParentData.coordinate = newCoordinate; |
| } |
| |
| void removeChild(_Coordinate? coordinate, RenderBox child) { |
| if (coordinate != null) { |
| _childrenByCoordinate.remove(coordinate); |
| } |
| dropChild(child); |
| } |
| |
| @override |
| void setupParentData(RenderObject child) { |
| if (child.parentData is! ParentData) { |
| child.parentData = _LatticeParentData(); |
| } |
| } |
| |
| TapGestureRecognizer? _tap; |
| |
| @override |
| void attach(PipelineOwner owner) { |
| super.attach(owner); |
| _horizontalOffset.addListener(_handleOffsetChange); |
| _verticalOffset.addListener(_handleOffsetChange); |
| _tap = TapGestureRecognizer(debugOwner: this) |
| ..onTapDown = _handleTapDown |
| ..onTapUp = _handleTapUp; |
| for (final RenderBox child in _childrenByCoordinate.values) { |
| child.attach(owner); |
| } |
| } |
| |
| @override |
| void detach() { |
| super.detach(); |
| _horizontalOffset.removeListener(_handleOffsetChange); |
| _verticalOffset.removeListener(_handleOffsetChange); |
| _tap?.dispose(); |
| for (final RenderBox child in _childrenByCoordinate.values) { |
| child.detach(); |
| } |
| } |
| |
| @override |
| void dispose() { |
| super.dispose(); |
| _clipLabelColumnHandle.layer = null; |
| _clipLabelRowHandle.layer = null; |
| _clipDataHandle.layer = null; |
| } |
| |
| @override |
| void redepthChildren() { |
| _childrenByCoordinate.values.forEach(redepthChild); |
| } |
| |
| @override |
| void visitChildren(RenderObjectVisitor visitor) { |
| _childrenByCoordinate.values.forEach(visitor); |
| } |
| |
| @override |
| bool get isRepaintBoundary => true; |
| |
| @override |
| double computeMinIntrinsicWidth(double? height) { |
| return _cellWidthCount * cellSize.width; |
| } |
| |
| @override |
| double computeMaxIntrinsicWidth(double height) { |
| return computeMinIntrinsicWidth(height); |
| } |
| |
| @override |
| double computeMinIntrinsicHeight(double? width) { |
| return _cellHeightCount * cellSize.height; |
| } |
| |
| @override |
| double computeMaxIntrinsicHeight(double width) { |
| return computeMinIntrinsicHeight(width); |
| } |
| |
| @override |
| bool get sizedByParent => true; |
| |
| @override |
| void performResize() { |
| size = Size( |
| constraints.hasBoundedWidth ? constraints.maxWidth : constraints.constrainWidth(computeMinIntrinsicWidth(null)), |
| constraints.hasBoundedHeight |
| ? constraints.maxHeight |
| : constraints.constrainHeight(computeMinIntrinsicHeight(null)), |
| ); |
| horizontalOffset.applyViewportDimension(size.width); |
| verticalOffset.applyViewportDimension(size.height); |
| _handleOffsetChange(duringLayout: true); |
| } |
| |
| Offset? _scrollOffset; |
| int? _firstX, _firstY, _lastX, _lastY; |
| |
| void _handleOffsetChange({bool duringLayout = false}) { |
| if (!hasSize) { |
| assert(_scrollOffset == null); |
| return; |
| } |
| final Offset scrollOffset = Offset(horizontalOffset.pixels, verticalOffset.pixels); |
| final int firstX = scrollOffset.dx ~/ cellSize.width; |
| final int lastX = ((scrollOffset.dx + size.width) / cellSize.width).ceil() - 1; |
| final int firstY = scrollOffset.dy ~/ cellSize.height; |
| final int lastY = math.min(((scrollOffset.dy + size.height) / cellSize.height).ceil(), _cellHeightCount) - 1; |
| if (scrollOffset != _scrollOffset) { |
| _scrollOffset = scrollOffset; |
| markNeedsPaint(); |
| } |
| if (firstX != _firstX || lastX != _lastX || firstY != _firstY || lastY != _lastY) { |
| _firstX = firstX; |
| _lastX = lastX; |
| _firstY = firstY; |
| _lastY = lastY; |
| if (!duringLayout) { |
| markNeedsLayout(); |
| } |
| } |
| } |
| |
| @override |
| void performLayout() { |
| assert(_scrollOffset != null); |
| final BoxConstraints childConstraints = BoxConstraints.tight(cellSize); |
| invokeLayoutCallback<BoxConstraints>((BoxConstraints constraints) { |
| delegate.beginLayout(); |
| }); |
| for (int y = 0; y < _cellHeightCount; y += 1) { |
| for (int x = 0; x < _cellWidthCount; x += 1) { |
| final _Coordinate here = _Coordinate(x, y); |
| final bool visible = (x == 0 || x >= _firstX!) && x <= _lastX! && (y == 0 || y >= _firstY!) && y <= _lastY!; |
| assert(y < cells.length); |
| final _LatticeCell cell = x < cells[y].length ? cells[y][x] : _LatticeCell.empty; |
| if (visible && cell.hasChild) { |
| RenderBox? child; |
| invokeLayoutCallback<BoxConstraints>((BoxConstraints constraints) { |
| child = delegate.updateLatticeChild(here, cell, _childrenByCoordinate[here]); |
| }); |
| assert(child != null); |
| assert(child!.parent == this); |
| assert(_childrenByCoordinate[here] == child); |
| child!.layout(childConstraints); |
| } |
| } |
| } |
| invokeLayoutCallback<BoxConstraints>((BoxConstraints constraints) { |
| delegate.endLayout(); |
| }); |
| horizontalOffset.applyContentDimensions( |
| 0.0, |
| math.max(0.0, computeMinIntrinsicWidth(null) - size.width), |
| ); |
| verticalOffset.applyContentDimensions( |
| 0.0, |
| math.max(0.0, computeMinIntrinsicHeight(null) - size.height), |
| ); |
| } |
| |
| final LayerHandle<ClipRectLayer> _clipLabelRowHandle = LayerHandle<ClipRectLayer>(); |
| final LayerHandle<ClipRectLayer> _clipLabelColumnHandle = LayerHandle<ClipRectLayer>(); |
| final LayerHandle<ClipRectLayer> _clipDataHandle = LayerHandle<ClipRectLayer>(); |
| |
| void _paintCell(PaintingContext context, Offset offset, int x, int y) { |
| final _Coordinate here = _Coordinate(x, y); |
| assert(y < cells.length); |
| final _LatticeCell cell = x < cells[y].length ? cells[y][x] : _LatticeCell.empty; |
| final Offset topLeft = _coordinateToOffset(here)! + offset; |
| final Painter? painter = cell.painter; |
| final RenderBox? child = cell.hasChild ? _childrenByCoordinate[here] : null; |
| assert(child == _childrenByCoordinate[here]); |
| assert(cell.hasChild == (child != null)); |
| if (painter != null) { |
| painter(context.canvas, topLeft & cellSize); |
| } |
| if (child != null) { |
| context.paintChild(child, topLeft); |
| } |
| } |
| |
| @override |
| void paint(PaintingContext context, Offset offset) { |
| assert(needsCompositing); |
| final Offset dataOffset = Offset(cellSize.width, cellSize.height); |
| final Size dataSize = size - dataOffset as Size; |
| if (dataSize.isEmpty) { |
| return; |
| } |
| _clipLabelColumnHandle.layer = context.pushClipRect( |
| needsCompositing, |
| offset, |
| Rect.fromLTWH(0, dataOffset.dy, cellSize.width, dataSize.height), |
| (PaintingContext context, Offset offset) { |
| for (int y = max(1, _firstY!); y <= _lastY!; y += 1) { |
| _paintCell(context, offset, 0, y); |
| } |
| }, |
| oldLayer: _clipLabelColumnHandle.layer, |
| ); |
| _clipLabelRowHandle.layer = context.pushClipRect( |
| needsCompositing, |
| offset, |
| Rect.fromLTWH(dataOffset.dx, 0, dataSize.width, cellSize.height), |
| (PaintingContext context, Offset offset) { |
| for (int x = max(1, _firstX!); x <= _lastX!; x += 1) { |
| _paintCell(context, offset, x, 0); |
| } |
| }, |
| oldLayer: _clipLabelRowHandle.layer, |
| ); |
| _clipDataHandle.layer = context.pushClipRect( |
| needsCompositing, |
| offset, |
| dataOffset & dataSize, |
| (PaintingContext context, Offset offset) { |
| for (int y = _firstY! + 1; y <= _lastY!; y += 1) { |
| for (int x = _firstX! + 1; x <= _lastX!; x += 1) { |
| _paintCell(context, offset, x, y); |
| } |
| } |
| }, |
| oldLayer: _clipDataHandle.layer, |
| ); |
| } |
| |
| @override |
| void applyPaintTransform(RenderBox child, Matrix4 transform) { |
| final _LatticeParentData childParentData = child.parentData as _LatticeParentData; |
| final Offset offset = _coordinateToOffset(childParentData.coordinate!)!; |
| transform.translate(offset.dx, offset.dy); |
| } |
| |
| @override |
| Rect describeApproximatePaintClip(RenderObject child) => Offset.zero & size; |
| |
| @override |
| void showOnScreen({ |
| RenderObject? descendant, |
| Rect? rect, |
| Duration duration = Duration.zero, |
| Curve curve = Curves.ease, |
| }) { |
| if (descendant != null) { |
| // TODO(ianh): Implement this. Not having this implemented means |
| // accessibility scrolling won't work for this viewport. |
| // |
| // The implementation should honor allowImplicitScrolling on |
| // horizontalOffset and verticalOffset, descendant and rect, and |
| // duration and curve. (If duration is Duration.zero, use jumpTo |
| // on the offsets, otherwise use animateTo.) |
| } |
| super.showOnScreen( |
| rect: rect, |
| duration: duration, |
| curve: curve, |
| ); |
| } |
| |
| _Coordinate? _offsetToCoordinate(Offset? position) { |
| late Offset absolute; |
| switch (textDirection) { |
| case TextDirection.rtl: |
| absolute = Offset(position!.dx - _scrollOffset!.dx, position.dy + _scrollOffset!.dy); |
| break; |
| case TextDirection.ltr: |
| absolute = position! + _scrollOffset!; |
| break; |
| } |
| switch (textDirection) { |
| case TextDirection.rtl: |
| return _Coordinate( |
| position.dx + cellSize.width > size.width ? 0 : (size.width - absolute.dx) ~/ cellSize.width, |
| position.dy < cellSize.height ? 0 : absolute.dy ~/ cellSize.height, |
| ); |
| case TextDirection.ltr: |
| return _Coordinate( |
| position.dx < cellSize.width ? 0 : absolute.dx ~/ cellSize.width, |
| position.dy < cellSize.height ? 0 : absolute.dy ~/ cellSize.height, |
| ); |
| } |
| } |
| |
| Offset? _coordinateToOffset(_Coordinate coordinate) { |
| final Offset adjustedScroll = Offset( |
| coordinate.x == 0 ? 0 : _scrollOffset!.dx, |
| coordinate.y == 0 ? 0 : _scrollOffset!.dy, |
| ); |
| switch (textDirection) { |
| case TextDirection.rtl: |
| return Offset( |
| size.width - (coordinate.x * cellSize.width) - cellSize.width + adjustedScroll.dx, |
| coordinate.y * cellSize.height - adjustedScroll.dy, |
| ); |
| case TextDirection.ltr: |
| return Offset( |
| coordinate.x * cellSize.width, |
| coordinate.y * cellSize.height, |
| ) - |
| adjustedScroll; |
| } |
| } |
| |
| @override |
| bool hitTestChildren(BoxHitTestResult result, {Offset? position}) { |
| final _Coordinate? coordinate = _offsetToCoordinate(position); |
| final RenderBox? child = _childrenByCoordinate[coordinate]; |
| return child != null && |
| result.addWithPaintOffset( |
| offset: _coordinateToOffset(coordinate!), |
| position: position!, |
| hitTest: (BoxHitTestResult result, Offset transformed) { |
| return child.hitTest(result, position: transformed); |
| }, |
| ); |
| } |
| |
| @override |
| bool hitTestSelf(Offset position) => true; |
| |
| @override |
| void handleEvent(PointerEvent event, BoxHitTestEntry entry) { |
| assert(debugHandleEvent(event, entry)); |
| final _Coordinate? coordinate = _offsetToCoordinate(event.localPosition); |
| if (event is PointerDownEvent && _hasTapHandler(coordinate!)) { |
| _tap?.addPointer(event); |
| } |
| } |
| |
| _Coordinate? _lastTapDown; |
| |
| void _handleTapDown(TapDownDetails details) { |
| _lastTapDown = _offsetToCoordinate(details.localPosition); |
| } |
| |
| void _handleTapUp(TapUpDetails details) { |
| final _Coordinate? lastTapUp = _offsetToCoordinate(details.localPosition); |
| if (_lastTapDown == lastTapUp && _hasTapHandler(lastTapUp!)) { |
| _getCellFor(_lastTapDown!)!.onTap!(_coordinateToOffset(lastTapUp)); |
| } |
| } |
| |
| @override |
| Rect describeSemanticsClip(RenderObject? child) => (Offset.zero & size).inflate(cellSize.longestSide); |
| } |
| |
| FlutterErrorDetails _debugReportException(FlutterErrorDetails details) { |
| FlutterError.reportError(details); |
| return details; |
| } |
| |
| /// A [MaterialScrollBehavior] that supports mouse dragging. |
| class _MouseDragScrollBehavior extends MaterialScrollBehavior { |
| static _MouseDragScrollBehavior? _instance; |
| static _MouseDragScrollBehavior get instance => _instance ??= _MouseDragScrollBehavior(); |
| |
| @override |
| Set<PointerDeviceKind> get dragDevices => <PointerDeviceKind>{ |
| PointerDeviceKind.touch, |
| PointerDeviceKind.mouse, |
| }; |
| } |
