feat: improve grid navigation with circular behavior

[wjyrich]

Enhanced keyboard navigation in fullscreen grid view to provide circular navigation behavior:

1. Added proper handling for empty grid scenarios
2. Implemented circular navigation within current page (wraps around when reaching edges)
3. Added proper page switching logic with circular behavior between pages
4. Fixed the previousIndex tracking for proper page transition state management
5. Ensured consistent event handling by always accepting key events

The changes improve user experience by making navigation more intuitive and preventing users from getting stuck at grid boundaries. The navigation now seamlessly wraps around both within a page and between pages.

Log: Improved keyboard navigation in fullscreen grid view with circular behavior

Influence:

1. Test left/right arrow key navigation in empty grid
2. Verify circular navigation within a single page
3. Test page switching behavior when reaching grid boundaries
4. Verify navigation between multiple pages with circular behavior
5. Check that previousIndex is properly set for page transitions
6. Test that key events are properly accepted and handled

feat: 改进网格导航实现循环行为

增强了全屏网格视图中的键盘导航功能，提供循环导航行为：

1. 添加了对空网格场景的适当处理
2. 在当前页面内实现了循环导航（到达边缘时自动环绕）
3. 添加了适当的页面切换逻辑，支持页面间的循环行为
4. 修复了previousIndex跟踪，确保正确的页面过渡状态管理
5. 通过始终接受按键事件确保一致的事件处理

这些改进通过使导航更加直观并防止用户在网格边界处卡住，提升了用户体验。导
航现在可以在页面内和页面间无缝环绕。

Log: 改进了全屏网格视图中的键盘导航，支持循环行为

Influence:

1. 在空网格中测试左右方向键导航
2. 验证单个页面内的循环导航
3. 测试到达网格边界时的页面切换行为
4. 验证多页面间的循环导航行为
5. 检查previousIndex是否正确设置用于页面过渡
6. 测试按键事件是否被正确接受和处理

PMS: BUG-339605 BUG-337493 BUG-324419

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[deepin-ci-robot]

deepin pr auto review

我来对这个diff进行详细的代码审查：

1. 代码逻辑改进：

• 原代码在处理左右键切换时逻辑较为简单，新代码增加了更完整的边界检查和状态管理
• 新代码增加了对proxyModel.count的检查，避免了空列表时的异常情况
• 对gridViewContainer.currentIndex的处理更加细致，支持在页面内循环切换

2. 代码质量提升：

• 增加了更多的中间变量(count, current, pageCount等)，提高了代码可读性
• 每个条件分支都有明确的注释说明，便于维护
• 事件处理更加完整，统一使用event.accepted = true

3. 性能优化：

• 提前检查count === 0，避免不必要的计算
• 使用局部变量缓存频繁访问的属性值，减少重复计算

4. 安全性改进：

• 增加了更多的边界条件检查，防止数组越界
• 对pageCount <= 1的特殊情况进行了单独处理

5. 建议进一步改进：

• 可以考虑将重复的边界检查逻辑抽取为公共函数
• 可以添加对current是否为有效值的检查
• 建议对listItem.viewIndex也进行有效性验证

6. 潜在风险：

• 在Keys.onRightPressed中，当pageCount <= 1时直接设置currentIndex为0，这可能与用户预期不符
• listviewPage.previousIndex的设置逻辑可能需要更详细的文档说明

总体来说，这次改动显著提升了代码的健壮性和可维护性，但建议在边界条件的处理上更加谨慎，并考虑添加更多的错误处理机制。

[deepin-ci-robot]

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This pull-request has been approved by: BLumia, wjyrich

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