Refactor/input

[wjian23]

Purpose of this Pull Request

Please briefly describe what this Pull Request is aiming to achieve.

Checklist Before Merging

Please ensure the following are completed before merging:

• If this is linked to an issue, include the link in your description.
• If you've made changes to the code or documentation, make sure these are updated in the CHANGELOG.md file.
• If you've introduced any break changes, briefly describe them in the Breaking section of the CHANGELOG.md file.

Additional Information

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[codecov]

Codecov Report

Attention: Patch coverage is 59.58220% with 445 lines in your changes missing coverage. Please review.

Project coverage is 84.38%. Comparing base (bdf7bf0) to head (16f8dc5).
Report is 8 commits behind head on master.

Files with missing lines	Patch %	Lines
widgets/src/input/text_editable.rs	51.54%	110 Missing ⚠️
widgets/src/input/text_selection.rs	37.50%	95 Missing ⚠️
widgets/src/input/edit_text.rs	28.12%	46 Missing ⚠️
widgets/src/input.rs	36.50%	40 Missing ⚠️
painter/src/text/typography_store.rs	19.51%	33 Missing ⚠️
widgets/src/select_region.rs	58.82%	21 Missing ⚠️
macros/src/part_state.rs	46.66%	16 Missing ⚠️
themes/material/src/classes/input_cls.rs	39.13%	14 Missing ⚠️
widgets/src/input/text_glyphs.rs	93.83%	13 Missing ⚠️
core/src/builtin_widgets/scrollable.rs	75.55%	11 Missing ⚠️
... and 7 more

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #684      +/-   ##
==========================================
+ Coverage   83.64%   84.38%   +0.74%     
==========================================
  Files         207      209       +2     
  Lines       28760    28759       -1     
==========================================
+ Hits        24055    24267     +212     
+ Misses       4705     4492     -213     

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