mirror of
https://gitlab.com/nkming2/nc-photos.git
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Refactoring
This commit is contained in:
Ming Ming
parent
1f01c83f9a
commit
77355eab20
2 changed files with 104 additions and 103 deletions
101
lib/widget/measureable_sliver_staggered_grid.dart
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101
lib/widget/measureable_sliver_staggered_grid.dart
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@ -0,0 +1,101 @@
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import 'package:flutter/foundation.dart';
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import 'package:flutter/widgets.dart';
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import 'package:flutter_staggered_grid_view/flutter_staggered_grid_view.dart';
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// ignore: must_be_immutable
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class MeasurableSliverStaggeredGrid extends SliverStaggeredGrid {
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MeasurableSliverStaggeredGrid.extentBuilder({
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Key key,
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@required double maxCrossAxisExtent,
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@required IndexedStaggeredTileBuilder staggeredTileBuilder,
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@required IndexedWidgetBuilder itemBuilder,
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@required int itemCount,
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double mainAxisSpacing = 0,
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double crossAxisSpacing = 0,
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}) : super(
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key: key,
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gridDelegate: SliverStaggeredGridDelegateWithMaxCrossAxisExtent(
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maxCrossAxisExtent: maxCrossAxisExtent,
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mainAxisSpacing: mainAxisSpacing,
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crossAxisSpacing: crossAxisSpacing,
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staggeredTileBuilder: staggeredTileBuilder,
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staggeredTileCount: itemCount,
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),
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delegate: SliverChildBuilderDelegate(
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itemBuilder,
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childCount: itemCount,
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),
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);
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@override
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createRenderObject(BuildContext context) {
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final element = context as SliverVariableSizeBoxAdaptorElement;
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_renderObject = RenderMeasurableSliverStaggeredGrid(
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childManager: element, gridDelegate: gridDelegate);
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return _renderObject;
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}
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RenderMeasurableSliverStaggeredGrid get renderObject => _renderObject;
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RenderMeasurableSliverStaggeredGrid _renderObject;
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}
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class RenderMeasurableSliverStaggeredGrid extends RenderSliverStaggeredGrid
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with WidgetsBindingObserver {
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RenderMeasurableSliverStaggeredGrid({
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@required RenderSliverVariableSizeBoxChildManager childManager,
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@required SliverStaggeredGridDelegate gridDelegate,
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}) : super(childManager: childManager, gridDelegate: gridDelegate);
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/// Calculate the height of this staggered grid view
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///
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/// This basically requires a complete layout of every child, so only call
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/// when necessary
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double calculateExtent() {
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childManager.didStartLayout();
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childManager.setDidUnderflow(false);
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double product = 0;
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final configuration = gridDelegate.getConfiguration(constraints);
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final mainAxisOffsets = configuration.generateMainAxisOffsets();
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// Iterate through all children
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for (var index = 0; true; index++) {
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var geometry = RenderSliverStaggeredGrid.getSliverStaggeredGeometry(
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index, configuration, mainAxisOffsets);
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if (geometry == null) {
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// There are either no children, or we are past the end of all our children.
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break;
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}
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final bool hasTrailingScrollOffset = geometry.hasTrailingScrollOffset;
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RenderBox child;
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if (!hasTrailingScrollOffset) {
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// Layout the child to compute its tailingScrollOffset.
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final constraints =
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BoxConstraints.tightFor(width: geometry.crossAxisExtent);
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child = addAndLayoutChild(index, constraints, parentUsesSize: true);
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geometry = geometry.copyWith(mainAxisExtent: paintExtentOf(child));
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}
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if (child != null) {
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final childParentData =
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child.parentData as SliverVariableSizeBoxAdaptorParentData;
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childParentData.layoutOffset = geometry.scrollOffset;
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childParentData.crossAxisOffset = geometry.crossAxisOffset;
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assert(childParentData.index == index);
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}
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final double endOffset =
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geometry.trailingScrollOffset + configuration.mainAxisSpacing;
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for (var i = 0; i < geometry.crossAxisCellCount; i++) {
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mainAxisOffsets[i + geometry.blockIndex] = endOffset;
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}
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if (endOffset > product) {
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product = endOffset;
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}
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}
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childManager.didFinishLayout();
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return product;
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}
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}
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@ -12,6 +12,7 @@ import 'package:nc_photos/platform/k.dart' as platform_k;
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import 'package:nc_photos/session_storage.dart';
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import 'package:nc_photos/session_storage.dart';
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import 'package:nc_photos/snack_bar_manager.dart';
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import 'package:nc_photos/snack_bar_manager.dart';
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import 'package:nc_photos/theme.dart';
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import 'package:nc_photos/theme.dart';
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import 'package:nc_photos/widget/measureable_sliver_staggered_grid.dart';
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import 'package:uuid/uuid.dart';
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import 'package:uuid/uuid.dart';
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abstract class SelectableItemStreamListItem {
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abstract class SelectableItemStreamListItem {
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@ -89,7 +90,7 @@ mixin SelectableItemStreamListMixin<T extends StatefulWidget>
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_prevItemStreamListCellSize = cellSize;
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_prevItemStreamListCellSize = cellSize;
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}
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}
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_gridKey = _GridKey("$_uniqueToken $cellSize");
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_gridKey = _GridKey("$_uniqueToken $cellSize");
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return _SliverStaggeredGrid.extentBuilder(
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return MeasurableSliverStaggeredGrid.extentBuilder(
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key: _gridKey,
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key: _gridKey,
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maxCrossAxisExtent: itemStreamListCellSize.toDouble(),
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maxCrossAxisExtent: itemStreamListCellSize.toDouble(),
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itemCount: _items.length,
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itemCount: _items.length,
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@ -110,7 +111,7 @@ mixin SelectableItemStreamListMixin<T extends StatefulWidget>
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void updateListHeight() {
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void updateListHeight() {
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try {
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try {
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final renderObj = _gridKey.currentContext.findRenderObject()
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final renderObj = _gridKey.currentContext.findRenderObject()
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as _RenderSliverStaggeredGrid;
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as RenderMeasurableSliverStaggeredGrid;
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final maxExtent = renderObj.calculateExtent();
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final maxExtent = renderObj.calculateExtent();
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_log.info("[updateListHeight] Max extent: $maxExtent");
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_log.info("[updateListHeight] Max extent: $maxExtent");
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if (maxExtent == 0) {
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if (maxExtent == 0) {
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@ -351,104 +352,3 @@ class _SelectableItemWidget extends StatelessWidget {
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final VoidCallback onLongPress;
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final VoidCallback onLongPress;
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final Widget child;
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final Widget child;
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}
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}
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// ignore: must_be_immutable
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class _SliverStaggeredGrid extends SliverStaggeredGrid {
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_SliverStaggeredGrid.extentBuilder({
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Key key,
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@required double maxCrossAxisExtent,
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@required IndexedStaggeredTileBuilder staggeredTileBuilder,
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@required IndexedWidgetBuilder itemBuilder,
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@required int itemCount,
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double mainAxisSpacing = 0,
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double crossAxisSpacing = 0,
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}) : super(
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key: key,
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gridDelegate: SliverStaggeredGridDelegateWithMaxCrossAxisExtent(
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maxCrossAxisExtent: maxCrossAxisExtent,
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mainAxisSpacing: mainAxisSpacing,
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crossAxisSpacing: crossAxisSpacing,
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staggeredTileBuilder: staggeredTileBuilder,
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staggeredTileCount: itemCount,
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),
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delegate: SliverChildBuilderDelegate(
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itemBuilder,
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childCount: itemCount,
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),
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);
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@override
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RenderSliverStaggeredGrid createRenderObject(BuildContext context) {
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final element = context as SliverVariableSizeBoxAdaptorElement;
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_renderObject = _RenderSliverStaggeredGrid(
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childManager: element, gridDelegate: gridDelegate);
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return _renderObject;
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}
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_RenderSliverStaggeredGrid get renderObject => _renderObject;
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_RenderSliverStaggeredGrid _renderObject;
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}
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class _RenderSliverStaggeredGrid extends RenderSliverStaggeredGrid
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with WidgetsBindingObserver {
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_RenderSliverStaggeredGrid({
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@required RenderSliverVariableSizeBoxChildManager childManager,
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@required SliverStaggeredGridDelegate gridDelegate,
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}) : super(childManager: childManager, gridDelegate: gridDelegate);
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/// Calculate the height of this staggered grid view
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///
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/// This basically requires a complete layout of every child, so only call
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/// when necessary
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double calculateExtent() {
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childManager.didStartLayout();
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childManager.setDidUnderflow(false);
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double product = 0;
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final configuration = gridDelegate.getConfiguration(constraints);
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final mainAxisOffsets = configuration.generateMainAxisOffsets();
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// Iterate through all children
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for (var index = 0; true; index++) {
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var geometry = RenderSliverStaggeredGrid.getSliverStaggeredGeometry(
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index, configuration, mainAxisOffsets);
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if (geometry == null) {
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// There are either no children, or we are past the end of all our children.
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break;
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}
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final bool hasTrailingScrollOffset = geometry.hasTrailingScrollOffset;
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RenderBox child;
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if (!hasTrailingScrollOffset) {
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// Layout the child to compute its tailingScrollOffset.
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final constraints =
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BoxConstraints.tightFor(width: geometry.crossAxisExtent);
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child = addAndLayoutChild(index, constraints, parentUsesSize: true);
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geometry = geometry.copyWith(mainAxisExtent: paintExtentOf(child));
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}
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if (child != null) {
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final childParentData =
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child.parentData as SliverVariableSizeBoxAdaptorParentData;
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childParentData.layoutOffset = geometry.scrollOffset;
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childParentData.crossAxisOffset = geometry.crossAxisOffset;
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assert(childParentData.index == index);
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}
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final double endOffset =
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geometry.trailingScrollOffset + configuration.mainAxisSpacing;
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for (var i = 0; i < geometry.crossAxisCellCount; i++) {
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mainAxisOffsets[i + geometry.blockIndex] = endOffset;
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}
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if (endOffset > product) {
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product = endOffset;
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}
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}
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childManager.didFinishLayout();
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return product;
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}
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static final _log = Logger(
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"widget.selectable_item_stream_list_mixin._RenderSliverStaggeredGrid");
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}
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