Flame chart - jumpTo called before scroll position offsets have new size
- 主要語言
- Dart
- 星號
- 1.7k
- 分支
- 404
- 平均合併
- 6 天 17 小時
- 30 天內合併 PR
- 18
描述
In flame_chart.dart, we call
```
linkedHorizontalScrollControllerGroup.jumpTo(newScrollOffset);
```
to update the scroll offset as we zoom. We call this inside of an animation controller listener `zoomController.addListener(() { ... })`. At times when we call this, `scrollController.position.maxScrollOffset` is not updated for the new zoom level and layout size, causing `jumpTo` to fire BallisticScrollActivities to bounce the scroll offset back to what it thinks is the `maxScrollOffset`.
We need to have a way to call `jumpTo` when we can guarantee that the min / max scroll offsets are updated for the new zoom value.
I attempted to set these offsets manually using `scrollController.position.applyContentDimensions(minScrollOffset, maxScrollOffset)` but this results in an error regarding gesture detectors: `The replaceGestureRecognizers() method can only be called during the layout phase.`
貢獻指南
研究方向
從 flame_chart.dart 中 zoomController 的監聽器以及 linkedHorizontalScrollControllerGroup.jumpTo(newScrollOffset) 呼叫開始。重現接近捲動邊界時的縮放,然後確認只有在新的最小/最大捲動偏移量可用後才會執行 jumpTo,同時不會觸發彈道回彈或手勢偵測器版面配置錯誤。
由索引模型根據 Issue 內容生成。
評估
- 技術堆疊
- dart, flutter
- 領域
- data-visualization, frontend
- Issue 類型
- 缺陷
- 難度
- 4/5
- 預估耗時
- 3-5 天
- 活躍度
- 停滯
- 描述清晰度
- 基本清楚
- 新手友好度
- 35/100