fix(ModalDialog): overflow top when set IsDraggable to true

[ArgoZhang]

overflow top when set IsDraggable to true

Summary of the changes (Less than 80 chars)

简单描述你更改了什么, 不超过80个字符；如果有关联 Issue 请在下方填写相关编号

Description

fixes #4994

Regression?

• Yes
• No

[If yes, specify the version the behavior has regressed from]

[是否影响老版本]

Risk

• High
• Medium
• Low

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Verification

• Manual (required)
• Automated

Packaging changes reviewed?

• Yes
• No
• N/A

☑️ Self Check before Merge

⚠️ Please check all items below before review. ⚠️

• Doc is updated/provided or not needed
• Demo is updated/provided or not needed
• Merge the latest code from the main branch

Summary by Sourcery

Bug Fixes:

• Fix the modal dialog overflow issue when "IsDraggable" is set to true.

[sourcery-ai]

Reviewer's Guide by Sourcery

This PR fixes a bug where the modal dialog overflows at the top when the IsDraggable property is set to true. The fix involves updating the JavaScript code to dynamically calculate the top margin of the modal, taking into account the viewport height and the modal's height. This ensures that the modal is always fully visible within the viewport, even when dragged.

Sequence diagram for Modal Dialog positioning calculation

sequenceDiagram
    participant M as Modal Dialog
    participant JS as JavaScript
    participant W as Window

M->>JS: init(id)
JS->>M: Get element
JS->>M: Get offsetHeight
JS->>W: Get innerHeight
JS->>M: Get computedStyle.marginTop
Note over JS: Calculate if modal fits in viewport
alt Modal fits in viewport
    JS->>M: Set margin-top = 50vh - height
end
JS->>M: Set margin-left = 50vw - width
JS->>M: Remove 'is-draggable-center' class

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State diagram for Modal Dialog positioning logic

stateDiagram-v2
    [*] --> CheckPosition
    CheckPosition --> FitsInViewport: viewBoxHeight - height - marginTop > 0
    CheckPosition --> DefaultPosition: viewBoxHeight - height - marginTop <= 0
    FitsInViewport --> SetCenteredPosition: Set margin-top = 50vh - height
    DefaultPosition --> KeepCurrentPosition
    SetCenteredPosition --> UpdateHorizontalPosition
    KeepCurrentPosition --> UpdateHorizontalPosition
    UpdateHorizontalPosition --> RemoveDraggableCenter
    RemoveDraggableCenter --> [*]

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File-Level Changes

Change	Details	Files
Dynamically calculate top margin	Added logic to calculate the top margin based on the viewport height and modal height. Removed the fixed calculation of the top margin. Added a conditional check to ensure the modal is always within the viewport when dragged to the top. Updated the calculation of the left margin to ensure the modal remains centered horizontally.	src/BootstrapBlazor/Components/Modal/ModalDialog.razor.js
Update project file	Updated the project file to reflect the changes in the JavaScript file.	src/BootstrapBlazor/BootstrapBlazor.csproj

Assessment against linked issues

Issue	Objective	Addressed	Explanation
#4994	When the modal dialog is draggable and its height exceeds the viewport height, ensure the title bar is accessible by scrolling	✅
#4994	Fix the positioning of the modal dialog when IsDraggable is set to true and the dialog is taller than the screen	✅

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[sourcery-ai]

Hey @ArgoZhang - I've reviewed your changes - here's some feedback:

Overall Comments:

• Please complete the PR template fully, including risk assessment and verification details. This helps maintainers better understand and review the changes.

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (d56df66) to head (3261be7).
Report is 13 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main     #4995   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          630       630           
  Lines        28099     28105    +6     
  Branches      4036      4030    -6     
=========================================
+ Hits         28099     28105    +6     

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