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Refactoring

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This commit is contained in:
Ming Ming 2021-07-05 17:32:06 +08:00
parent 1f01c83f9a
commit 77355eab20
2 changed files with 104 additions and 103 deletions
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101
lib/widget/measureable_sliver_staggered_grid.dart Normal file
View file

@ -0,0 +1,101 @@
import 'package:flutter/foundation.dart';
import 'package:flutter/widgets.dart';
import 'package:flutter_staggered_grid_view/flutter_staggered_grid_view.dart';
// ignore: must_be_immutable
class MeasurableSliverStaggeredGrid extends SliverStaggeredGrid {
MeasurableSliverStaggeredGrid.extentBuilder({
Key key,
@required double maxCrossAxisExtent,
@required IndexedStaggeredTileBuilder staggeredTileBuilder,
@required IndexedWidgetBuilder itemBuilder,
@required int itemCount,
double mainAxisSpacing = 0,
double crossAxisSpacing = 0,
}) : super(
key: key,
gridDelegate: SliverStaggeredGridDelegateWithMaxCrossAxisExtent(
maxCrossAxisExtent: maxCrossAxisExtent,
mainAxisSpacing: mainAxisSpacing,
crossAxisSpacing: crossAxisSpacing,
staggeredTileBuilder: staggeredTileBuilder,
staggeredTileCount: itemCount,
),
delegate: SliverChildBuilderDelegate(
itemBuilder,
childCount: itemCount,
),
);
@override
createRenderObject(BuildContext context) {
final element = context as SliverVariableSizeBoxAdaptorElement;
_renderObject = RenderMeasurableSliverStaggeredGrid(
childManager: element, gridDelegate: gridDelegate);
return _renderObject;
}
RenderMeasurableSliverStaggeredGrid get renderObject => _renderObject;
RenderMeasurableSliverStaggeredGrid _renderObject;
}
class RenderMeasurableSliverStaggeredGrid extends RenderSliverStaggeredGrid
with WidgetsBindingObserver {
RenderMeasurableSliverStaggeredGrid({
@required RenderSliverVariableSizeBoxChildManager childManager,
@required SliverStaggeredGridDelegate gridDelegate,
}) : super(childManager: childManager, gridDelegate: gridDelegate);
/// Calculate the height of this staggered grid view
///
/// This basically requires a complete layout of every child, so only call
/// when necessary
double calculateExtent() {
childManager.didStartLayout();
childManager.setDidUnderflow(false);
double product = 0;
final configuration = gridDelegate.getConfiguration(constraints);
final mainAxisOffsets = configuration.generateMainAxisOffsets();
// Iterate through all children
for (var index = 0; true; index++) {
var geometry = RenderSliverStaggeredGrid.getSliverStaggeredGeometry(
index, configuration, mainAxisOffsets);
if (geometry == null) {
// There are either no children, or we are past the end of all our children.
break;
}
final bool hasTrailingScrollOffset = geometry.hasTrailingScrollOffset;
RenderBox child;
if (!hasTrailingScrollOffset) {
// Layout the child to compute its tailingScrollOffset.
final constraints =
BoxConstraints.tightFor(width: geometry.crossAxisExtent);
child = addAndLayoutChild(index, constraints, parentUsesSize: true);
geometry = geometry.copyWith(mainAxisExtent: paintExtentOf(child));
}
if (child != null) {
final childParentData =
child.parentData as SliverVariableSizeBoxAdaptorParentData;
childParentData.layoutOffset = geometry.scrollOffset;
childParentData.crossAxisOffset = geometry.crossAxisOffset;
assert(childParentData.index == index);
}
final double endOffset =
geometry.trailingScrollOffset + configuration.mainAxisSpacing;
for (var i = 0; i < geometry.crossAxisCellCount; i++) {
mainAxisOffsets[i + geometry.blockIndex] = endOffset;
}
if (endOffset > product) {
product = endOffset;
}
}
childManager.didFinishLayout();
return product;
}
}

106
lib/widget/selectable_item_stream_list_mixin.dart
View file

@ -12,6 +12,7 @@ import 'package:nc_photos/platform/k.dart' as platform_k;
import 'package:nc_photos/session_storage.dart';
import 'package:nc_photos/snack_bar_manager.dart';
import 'package:nc_photos/theme.dart';
import 'package:nc_photos/widget/measureable_sliver_staggered_grid.dart';
import 'package:uuid/uuid.dart';
abstract class SelectableItemStreamListItem {
@ -89,7 +90,7 @@ mixin SelectableItemStreamListMixin<T extends StatefulWidget>
_prevItemStreamListCellSize = cellSize;
}
_gridKey = _GridKey("$_uniqueToken $cellSize");
return _SliverStaggeredGrid.extentBuilder(
return MeasurableSliverStaggeredGrid.extentBuilder(
key: _gridKey,
maxCrossAxisExtent: itemStreamListCellSize.toDouble(),
itemCount: _items.length,
@ -110,7 +111,7 @@ mixin SelectableItemStreamListMixin<T extends StatefulWidget>
void updateListHeight() {
try {
final renderObj = _gridKey.currentContext.findRenderObject()
as _RenderSliverStaggeredGrid;
as RenderMeasurableSliverStaggeredGrid;
final maxExtent = renderObj.calculateExtent();
_log.info("[updateListHeight] Max extent: $maxExtent");
if (maxExtent == 0) {
@ -351,104 +352,3 @@ class _SelectableItemWidget extends StatelessWidget {
final VoidCallback onLongPress;
final Widget child;
}
// ignore: must_be_immutable
class _SliverStaggeredGrid extends SliverStaggeredGrid {
_SliverStaggeredGrid.extentBuilder({
Key key,
@required double maxCrossAxisExtent,
@required IndexedStaggeredTileBuilder staggeredTileBuilder,
@required IndexedWidgetBuilder itemBuilder,
@required int itemCount,
double mainAxisSpacing = 0,
double crossAxisSpacing = 0,
}) : super(
key: key,
gridDelegate: SliverStaggeredGridDelegateWithMaxCrossAxisExtent(
maxCrossAxisExtent: maxCrossAxisExtent,
mainAxisSpacing: mainAxisSpacing,
crossAxisSpacing: crossAxisSpacing,
staggeredTileBuilder: staggeredTileBuilder,
staggeredTileCount: itemCount,
),
delegate: SliverChildBuilderDelegate(
itemBuilder,
childCount: itemCount,
),
);
@override
RenderSliverStaggeredGrid createRenderObject(BuildContext context) {
final element = context as SliverVariableSizeBoxAdaptorElement;
_renderObject = _RenderSliverStaggeredGrid(
childManager: element, gridDelegate: gridDelegate);
return _renderObject;
}
_RenderSliverStaggeredGrid get renderObject => _renderObject;
_RenderSliverStaggeredGrid _renderObject;
}
class _RenderSliverStaggeredGrid extends RenderSliverStaggeredGrid
with WidgetsBindingObserver {
_RenderSliverStaggeredGrid({
@required RenderSliverVariableSizeBoxChildManager childManager,
@required SliverStaggeredGridDelegate gridDelegate,
}) : super(childManager: childManager, gridDelegate: gridDelegate);
/// Calculate the height of this staggered grid view
///
/// This basically requires a complete layout of every child, so only call
/// when necessary
double calculateExtent() {
childManager.didStartLayout();
childManager.setDidUnderflow(false);
double product = 0;
final configuration = gridDelegate.getConfiguration(constraints);
final mainAxisOffsets = configuration.generateMainAxisOffsets();
// Iterate through all children
for (var index = 0; true; index++) {
var geometry = RenderSliverStaggeredGrid.getSliverStaggeredGeometry(
index, configuration, mainAxisOffsets);
if (geometry == null) {
// There are either no children, or we are past the end of all our children.
break;
}
final bool hasTrailingScrollOffset = geometry.hasTrailingScrollOffset;
RenderBox child;
if (!hasTrailingScrollOffset) {
// Layout the child to compute its tailingScrollOffset.
final constraints =
BoxConstraints.tightFor(width: geometry.crossAxisExtent);
child = addAndLayoutChild(index, constraints, parentUsesSize: true);
geometry = geometry.copyWith(mainAxisExtent: paintExtentOf(child));
}
if (child != null) {
final childParentData =
child.parentData as SliverVariableSizeBoxAdaptorParentData;
childParentData.layoutOffset = geometry.scrollOffset;
childParentData.crossAxisOffset = geometry.crossAxisOffset;
assert(childParentData.index == index);
}
final double endOffset =
geometry.trailingScrollOffset + configuration.mainAxisSpacing;
for (var i = 0; i < geometry.crossAxisCellCount; i++) {
mainAxisOffsets[i + geometry.blockIndex] = endOffset;
}
if (endOffset > product) {
product = endOffset;
}
}
childManager.didFinishLayout();
return product;
}
static final _log = Logger(
"widget.selectable_item_stream_list_mixin._RenderSliverStaggeredGrid");
}