fix: adjust dark mode button style parameters and add soft shadow support / 修复深色模式按钮样式参数并新增柔和投影支持

[iCancely]

Summary / 概述

Fix several dark mode (common family) button styling issues on the v25-flowstyle branch, and add soft shadow rendering support for the pressed state.

修复 v25-flowstyle 分支上深色模式（common 系列）按钮的若干样式问题，并为 pressed 状态新增柔和投影渲染支持。

Changes / 变更内容

FlowStyle.qml — dark mode button parameters / 深色模式按钮参数

Parameter / 参数	Before / 修改前	After / 修改后
background1.normalDark.common opacity	1.0	0.6
background2.normalDark.common opacity	1.0	0.6
background1.hoveredDark.common opacity	0.6	0.4
background2.hoveredDark.common opacity	0.6	0.4
background1.pressedDark	rgba(1,1,1,0.05)	rgba(40,40,40,1)
background2.pressedDark	(missing — fell back to normalDark)	rgba(46,46,46,1)
dropShadow.pressedDark	(missing — fell back to normalDark=transparent)	rgba(0,0,0,0.4)
innerShadow1.normalDark	rgba(0,0,0,0.5)	rgba(0,0,0,0.2)
innerShadow1.hoveredDark	rgba(0,0,0,0.6)	rgba(0,0,0,0.3)
innerShadow1.pressedDark	(missing — fell back to normalDark)	transparent
innerShadow2.pressedDark	(missing — fell back to normalDark)	rgba(255,255,255,0.07)
insideBorder.hoveredDark	(missing — fell back to hovered light)	transparent
outsideBorder.pressedDark	(missing — fell back to normalDark)	transparent

Note / 说明: DTK Palette fallback behavior: when pressedDark is missing, Dark+Pressed falls back to Dark+Normal (normalDark), not to pressed (Light). This caused the phantom black inner shadow in pressed state. Adding explicit pressedDark entries fixes this.

说明: DTK Palette 回退机制：当 pressedDark 缺失时，Dark+Pressed 会回退到 Dark+Normal（normalDark），而不是 pressed（浅色）。这导致 pressed 状态下出现了不应有的黑色内阴影。添加显式的 pressedDark 条目即可修复此问题。

BoxPanel.qml — soft shadow rendering / 柔和投影渲染

• Added a BoxShadow Loader for soft drop shadow rendering when boxShadowBlur > 0.

• Hard shadow Rectangles (boxShadowBlur === 0) and the soft shadow Loader (boxShadowBlur > 0) are mutually exclusive — only one renders at a time.

• Gated by enableBoxShadow and enableDropShadow, so checked/highlighted buttons are unaffected.

• 新增 BoxShadow Loader，当 boxShadowBlur > 0 时渲染柔和投影。

• 硬投影 Rectangle（boxShadowBlur === 0）与柔和投影 Loader（boxShadowBlur > 0）互斥，同一时刻只渲染一个。

• 受 enableBoxShadow 和 enableDropShadow 约束，不影响 checked/highlighted 按钮。

ButtonPanel.qml — pressed shadow blur / pressed 投影模糊

• boxShadowBlur: pressed state uses blur=1 (soft shadow), normal/hover use 0 (hard shadow).

• Updated stale comment to reflect the new behavior.

• boxShadowBlur：pressed 状态使用 blur=1（柔和投影），normal/hover 使用 0（硬投影）。

• 更新过时注释以反映新行为。

Verification / 验证

• Compiles cleanly with no warnings (make -j$(nproc) in build-dtk6/).

• Verified visually in dtk6-exhibition example under dark theme: normal, hover, and pressed states all render correctly.

• 编译无警告（build-dtk6/ 下 make -j$(nproc)）。

• 在 dtk6-exhibition 示例中深色主题下目视验证：normal、hover、pressed 状态均渲染正确。

Summary by Sourcery

Fix dark-mode button appearance and add soft shadows for pressed states.

New Features:

• Add soft drop-shadow rendering for pressed buttons.

Bug Fixes:

• Correct dark-mode common button colors, opacity, shadows, and borders across normal, hover, and pressed states.

Enhancements:

• Use blurred pressed-state shadows while retaining hard shadows for normal and hover states.

[sourcery-ai]

Reviewer's Guide

Fixes dark-mode common button palette fallbacks and appearance, and introduces a gated BoxShadow path so pressed buttons render with a soft one-pixel shadow while normal and hovered buttons retain hard shadows.

Flow diagram for button shadow rendering by state

flowchart TD
    State[Button state] --> Select[ButtonPanel selects boxShadowBlur]
    Select -->|normal or hovered: 0| Hard[Hard shadow Rectangles]
    Select -->|pressed: 1| Gate[BoxPanel shadow gates]
    Gate -->|enableBoxShadow and enableDropShadow| Soft[Soft BoxShadow Loader]
    Hard --> Render[Rendered button shadow]
    Soft --> Render

Loading

File-Level Changes

Change	Details	Files
Correct dark-mode common button palette values and define explicit state-specific fallbacks.	Reduce normal and hovered background opacities. Set dark pressed background layers to opaque dark colors. Add dark pressed drop/inner shadow values and remove unintended borders/shadows through transparent entries.	qt6/src/qml/FlowStyle.qml
Add mutually exclusive soft drop-shadow rendering for blurred button shadows.	Load BoxShadow only when shadowing is enabled, the selected color is visible, and blur is greater than zero. Keep existing hard-shadow rectangles active only for the zero-blur path through the new conditional behavior.	qt6/src/qml/BoxPanel.qml
Configure pressed buttons to use a one-pixel soft shadow while retaining hard shadows for normal and hovered states.	Select blur 1 for pressed state and blur 0 otherwise. Update shadow offsets and comments to document the pressed-state rendering model.	qt6/src/qml/private/ButtonPanel.qml

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[iCancely]

@18202781743

[deepin-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: 18202781743, iCancely

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