[0152] PDF 阅读器小手拖动使用 QScroller 实现#3435
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将 Okular 的默认浏览工具（小手拖动）的产品细节、光标状态机、 QScroller 驱动、屏幕边缘光标环绕、缩略图交互等调研结果写入 devel/0152.md。 Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
- 默认显示 OpenHandCursor，左键按下拖动时变为 ClosedHandCursor - 使用曼哈顿距离阈值区分拖动与点击 - 拖动时直接操作垂直滚动条，实现平滑滚动 - 在关键位置添加 LIII_DEBUG 日志（press/drag/release） - 更新现有矩形选择模式的光标回退逻辑（恢复为 OpenHandCursor） - 添加 6 个单元测试覆盖小手功能的各个场景 - 更新 devel/0152.md How 部分，补充实现方案 Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
将拖动公式从 +dy 改为 -dy，使得鼠标向下拖动时页面向下移动 （滚动条值减小），符合"抓住纸往下拉"的直觉。 - 更新 test_dragScrollsDown：先在中间位置开始，验证向下拖动后 滚动条值减小 - 更新 devel/0152.md How 部分的方向描述 Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
- 在 mouseMove 中实时采集拖动速度（px/ms） - 释放时若速度超过 0.5 px/ms，启动惯性滚动定时器（60fps） - 每帧按速度更新滚动条位置，并乘以 0.85 减速因子 - 速度低于 0.3 px/ms 时自动停止 - 添加 2 个单元测试覆盖惯性滚动启动和停止 - 更新 devel/0152.md 补充惯性滚动实现细节 Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
- mousePress 时立即显示 ClosedHandCursor，无需等待拖动阈值 - mouseMove 时无论移动多少距离都直接更新滚动位置 - browseDragActive_ 仅用于区分单击 vs 拖动，不再阻止滚动更新 - 同步更新 devel/0152.md 和单元测试 Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
替换手动滚动条操作和自定义惯性滚动，改用 Qt QScroller 驱动，配置与 Okular 相同的滚动参数： - DecelerationFactor = 0.3 - MaximumVelocity = 1.0 - DragStartDistance = 0.0（零延迟响应） - OvershootAlwaysOff（边界无回弹） Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
- 使用事件原生时间戳 mouseEvent->timestamp() 替代 wall clock - 添加 scrollBar singleStep(20) 与 Okular 保持一致 - 添加滚动条与 QScroller 的 actionTriggered 同步 Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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摘要
将 PDF 阅读器小手（Browse Tool）拖动滚动的手动实现替换为 Qt
QScroller，使行为与 Okular 完全一致。改动内容
QScroller::handleInput()处理InputPress/InputMove/InputRelease，替代直接操作滚动条DecelerationFactor = 0.3MaximumVelocity = 1.0DragStartDistance = 0.0（零延迟响应）HorizontalOvershootPolicy / VerticalOvershootPolicy = OvershootAlwaysOffinertialTimer_、inertialVelocityY_等），惯性滚动由 QScroller 内置处理OpenHandCursor→ClosedHandCursor）和点击保护逻辑测试计划
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