Slider: add themeable mouse cursor v2#96623
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HansMuller merged 2 commits intoflutter:masterfrom Jan 14, 2022
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| assert(widget.onChangeStart != null); | ||
| widget.onChangeStart!(_lerp(value)); |
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Do we know the history of this assert? Is it here just to protect the reference in the call below? If so, yeah it would be good to remove it as you have. But was it actually a requirement of the widget to not have this null (which seems odd)? If so it should be moved to the widget constructor, no? Same for the similar assert in _handleDragEnd.
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It was just to defend against an error being introduced in the original code on lines 751,752. No longer needed.
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| final Set<MaterialState> states = <MaterialState>{ | ||
| if (!_enabled) MaterialState.disabled, | ||
| if (_hovering) MaterialState.hovered, | ||
| if (_focused) MaterialState.focused, | ||
| if (_dragging) MaterialState.dragged, | ||
| }; |
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Nice set up here. I like this pattern.
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| onChangeStart: widget.onChangeStart != null ? _handleDragStart : null, | ||
| onChangeEnd: widget.onChangeEnd != null ? _handleDragEnd : null, |
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Wow, that seemed like a convoluted way to hook up the callback. Nice cleanup.
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Allow themes to override Slider's mouse cursor.
Partial fix to #88371
This PR is based on #88425 (author: @jpnurmi). It's been extended a little per the review feedback for the PR. PR #88371 wasn't reviewed for months by yours truly, so I'm completing the project here.