feat(PdfReader): support Watermark component

[densen2014]

Link issues

fixes #418

Summary By Copilot

feat(PdfReader ): 全局水印（Watermark IsPage="true"）未应用到演示模式中

dotnetcore/BootstrapBlazor#5811 (comment)

Regression?

• Yes
• No

Risk

• High
• Medium
• Low

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

Enhance PDF reader watermark functionality to support displaying watermark only during full-screen presentation mode

New Features:

• Add a new parameter WatermarkDemoModeOnly to control watermark visibility in PDF reader

Enhancements:

• Modify JavaScript to dynamically show/hide watermark based on full-screen state
• Update URL generation to include new watermark demo mode parameter

[bb-auto]

Thanks for your PR, @densen2014. Someone from the team will get assigned to your PR shortly and we'll get it reviewed.

[sourcery-ai]

Reviewer's Guide by Sourcery

This pull request introduces a new feature to the PDF reader component that allows the watermark to be displayed only when the PDF is in fullscreen presentation mode. This is achieved by adding a new WatermarkDemoModeOnly parameter to the PdfReader component and modifying the JavaScript code to handle the conditional display of the watermark based on the fullscreen state.

Sequence diagram for Watermark display in fullscreen mode

sequenceDiagram
    participant User
    participant PdfReader.razor.cs
    participant limit.js
    participant Browser

    User->>PdfReader.razor.cs: Sets WatermarkDemoModeOnly to true and Watermark
    PdfReader.razor.cs->>PdfReader.razor.cs: GenUrl()
    PdfReader.razor.cs-->>Browser: Generates URL with wmonlydemo=true and wm=Watermark
    Browser->>limit.js: Loads limit.js with URL parameters
    limit.js->>Browser: Adds 'fullscreenchange' event listener
    Browser->>User: User enters fullscreen mode
    Browser->>limit.js: 'fullscreenchange' event triggered
    limit.js->>limit.js: Checks if viewerContainer is in fullscreen
    alt viewerContainer is in fullscreen
        limit.js->>Browser: Sets watermark value
    else viewerContainer is not in fullscreen
        limit.js->>Browser: Clears watermark value
    end

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File-Level Changes

Change	Details	Files
Added a new parameter to the PdfReader component to control watermark display behavior in demo mode.	Introduced the WatermarkDemoModeOnly parameter to conditionally display the watermark only in fullscreen presentation mode. Modified the URL generation logic to include the wmonlydemo parameter based on the WatermarkDemoModeOnly property.	src/components/BootstrapBlazor.PdfReader/PdfReader.razor.cs
Modified JavaScript code to handle conditional watermark display based on fullscreen mode.	Added a check for the wmonlydemo query parameter. Implemented an event listener for fullscreen changes to update the watermark value based on the fullscreen state. The watermark value is cleared when exiting fullscreen mode.	src/components/BootstrapBlazor.PdfReader/wwwroot/web/limit.js

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[sourcery-ai]

Hey @densen2014 - I've reviewed your changes - here's some feedback:

Overall Comments:

• Consider debouncing the fullscreen event listener to avoid excessive updates to the watermark.

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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