fix(style): adjust slider groove offset when no ticks are displayed #304

add-uos · 2026-02-09T01:59:16Z

When a slider has no tick marks, the groove now extends to the full width/height of the slider area without indentation at the ends.

log: adjust slider groove offset when no ticks are displayed
bug: PMS-299727

18202781743 · 2026-02-09T02:11:22Z

styleplugins/chameleon/chameleonstyle.cpp

                    qreal rectWidth = rectHandle.width() / 2.0;
-                    p->drawLine(QPointF(rectGroove.left() + rectWidth, rectHandle.center().y()), QPointF(rectHandle.center().x(), rectHandle.center().y()));
+                    // 只有当不绘制刻度线的时候，就不要给滑槽两边弄缩进
+                    qreal leftOffset = (slider->tickPosition == QSlider::NoTicks) ? 0 : rectWidth;


(slider->tickPosition == QSlider::NoTicks)可以isNoticks去判断，

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Pull request overview

Adjusts Chameleon style slider groove rendering so that when a slider has no tick marks, the groove is not indented at the ends and instead spans the full available length (per PMS-299727).

Changes:

Remove groove end indentation when tickPosition == QSlider::NoTicks for horizontal sliders.
Remove groove end indentation when tickPosition == QSlider::NoTicks for vertical sliders.

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Copilot · 2026-02-09T02:16:22Z

styleplugins/chameleon/chameleonstyle.cpp

+                    // 只有当不绘制刻度线的时候，就不要给滑槽两边弄缩进
+                    qreal leftOffset = (slider->tickPosition == QSlider::NoTicks) ? 0 : rectWidth;
+                    p->drawLine(QPointF(rectGroove.left() + leftOffset, rectHandle.center().y()), QPointF(rectHandle.center().x(), rectHandle.center().y()));
                    // 绘制滑块到最右的位置的滑槽
                    pen.setColor(color);
                    p->setPen(pen);
-                    p->drawLine(QPointF(rectGroove.right() - rectWidth, rectHandle.center().y()), QPointF(rectHandle.center().x(), rectHandle.center().y()));
+                    qreal rightOffset = (slider->tickPosition == QSlider::NoTicks) ? 0 : rectWidth;
+                    p->drawLine(QPointF(rectGroove.right() - rightOffset, rectHandle.center().y()), QPointF(rectHandle.center().x(), rectHandle.center().y()));


The new groove-offset logic keys off slider->tickPosition, but this file already treats DSlider as a special case where the effective tick position may come from dslider->tickPosition() (see e.g. the handle drawing/focus logic). This can make groove indentation inconsistent with handle shape/color decisions for DSlider. Consider computing a single effective TickPosition (or noTicks bool) using the same dslider ? dslider->tickPosition() : slider->tickPosition rule and reuse it for all offsets here.

Copilot · 2026-02-09T02:16:22Z

styleplugins/chameleon/chameleonstyle.cpp

+                    // 只有当不绘制刻度线的时候，就不要给滑槽两边弄缩进
+                    qreal bottomOffset = (slider->tickPosition == QSlider::NoTicks) ? 0 : rectWidth;
+                    p->drawLine(QPointF(rectGroove.center().x(), rectGroove.bottom() - bottomOffset), QPointF(rectGroove.center().x(), rectHandle.center().y()));
                    // 绘制滑块到最下的位置的滑槽
                    pen.setColor(color);
                    p->setPen(pen);
-                    p->drawLine(QPointF(rectGroove.center().x(), rectGroove.top() + rectWidth), QPointF(rectGroove.center().x(), rectHandle.center().y()));
+                    qreal topOffset = (slider->tickPosition == QSlider::NoTicks) ? 0 : rectWidth;
+                    p->drawLine(QPointF(rectGroove.center().x(), rectGroove.top() + topOffset), QPointF(rectGroove.center().x(), rectHandle.center().y()));


Same as the horizontal case: bottomOffset/topOffset are derived from slider->tickPosition only. For DSlider, other parts of this style use dslider->tickPosition() as the source of truth, so the groove could still be indented even when the handle is rendered in the NoTicks style. Please use a single effective tick-position/noTicks value (including the DSlider override) for these offsets as well.

When a slider has no tick marks, the groove now extends to the full width/height of the slider area without indentation at the ends. log: adjust slider groove offset when no ticks are displayed bug: PMS-299727

deepin-ci-robot · 2026-02-09T03:13:52Z

deepin pr auto review

这段代码是针对 Qt 自定义样式中 QSlider（滑块）控件的绘制逻辑进行了修改，主要是为了优化滑槽在不同状态下的显示效果。以下是对这段 diff 的审查意见，分为语法逻辑、代码质量、代码性能和代码安全四个方面：

1. 语法逻辑

逻辑正确性：修改后的逻辑是合理的。
- 原代码在绘制滑槽时，左右（或上下）总是会有一个 rectWidth（滑块宽度或高度的一半）的缩进。
- 新代码引入了 offset 变量，通过判断 slider->tickPosition == QSlider::NoTicks 来决定是否应用这个缩进。
- 逻辑意图：当滑块没有刻度线时，滑槽应该填满整个可用空间，不需要为刻度预留空间，因此 offset 为 0；当有刻度线时，保持原有的缩进逻辑。这符合 UI 设计的常规直觉。
计算准确性：
- 水平方向：rectGroove.left() + offset 和 rectGroove.right() - offset 的计算是正确的。
- 垂直方向：rectGroove.bottom() - offset 和 rectGroove.top() + offset 的计算也是正确的。

2. 代码质量

可读性：代码质量较高。
- 引入 offset 变量消除了重复的三元运算符逻辑，使得 drawLine 的参数更加清晰。
- 注释 // 只有当不绘制刻度线的时候，就不要给滑槽两边弄缩进 虽然口语化，但准确描述了代码意图，有助于理解。
一致性：水平滑块和垂直滑块的修改逻辑保持一致，遵循了对称性原则，易于维护。

3. 代码性能

性能影响：极小。
- 增加了一次 slider->tickPosition 的读取和一次条件判断。
- 由于这是在绘图事件中调用的，且计算量非常微小（简单的浮点数加减），不会对性能产生可感知的影响。

4. 代码安全

空指针检查：代码中使用了 slider 指针（slider->tickPosition）。
- 潜在风险：如果在进入此 if 分支之前没有确保 slider 指针非空，这里存在潜在的空指针解引用风险。
- 建议：请确认 slider 指针的有效性。通常在 drawComplexControl 中，option 会被 qstyleoption_cast 转换为 const QStyleOptionSlider *，建议在转换后立即检查是否为 nullptr。
- 示例：
```
if (const QStyleOptionSlider *slider = qstyleoption_cast<const QStyleOptionSlider *>(option)) {
    // ... 现有代码 ...
}
```
类型安全：使用了 qreal 进行坐标计算，符合 Qt 绘图系统的标准做法，类型转换安全。

总结与改进建议

这段代码修改本身是优秀的，它解决了一个具体的 UI 细节问题（无刻度时滑槽的填充），且实现方式简洁。

改进建议：

注释规范化：建议将注释修改得稍微正式一些，例如：

// 如果没有刻度线，滑槽不需要预留缩进空间
qreal offset = (slider->tickPosition == QSlider::NoTicks) ? 0 : rectWidth;

代码复用（可选）：如果这段逻辑在多处使用，可以考虑提取为一个辅助函数，但考虑到上下文特定性，目前的内联写法也是完全可以接受的。

结论： 该代码修改可以合并。逻辑清晰，修正了特定场景下的显示效果，没有引入明显的副作用或性能问题。只需确保调用处对 slider 指针进行了必要的判空处理即可。

deepin-ci-robot · 2026-02-09T03:21:29Z

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: 18202781743, add-uos

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18202781743 reviewed Feb 9, 2026

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18202781743 requested a review from Copilot February 9, 2026 02:13

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add-uos force-pushed the master branch from 2d13cd1 to e8c5f9b Compare February 9, 2026 02:33

fix(style): adjust slider groove offset when no ticks are displayed

c32bf23

When a slider has no tick marks, the groove now extends to the full width/height of the slider area without indentation at the ends. log: adjust slider groove offset when no ticks are displayed bug: PMS-299727

add-uos force-pushed the master branch from e8c5f9b to c32bf23 Compare February 9, 2026 03:12

18202781743 approved these changes Feb 9, 2026

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18202781743 merged commit 77e5b6f into linuxdeepin:master Feb 9, 2026
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fix(style): adjust slider groove offset when no ticks are displayed #304

fix(style): adjust slider groove offset when no ticks are displayed #304

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fix(style): adjust slider groove offset when no ticks are displayed #304

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deepin-ci-robot commented Feb 9, 2026

deepin pr auto review

1. 语法逻辑

2. 代码质量

3. 代码性能

4. 代码安全

总结与改进建议

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