feat(PdfReader): add ShowToolbar parameter

[ArgoZhang]

Link issues

fixes #740

Summary By Copilot

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

Adjust PdfReader toolbar rendering and styling when the toolbar is hidden.

Enhancements:

• Render the PdfReader toolbar container consistently while conditionally displaying its contents based on the ShowToolbar parameter.
• Set a CSS custom property to collapse the toolbar height when ShowToolbar is false to maintain proper layout behavior.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Adjusts PdfReader toolbar rendering so the toolbar container is always present while allowing it to be visually hidden via a new CSS variable when ShowToolbar is false, improving layout consistency and enabling external styling based on toolbar visibility.

Class diagram for updated PdfReader toolbar and style handling

classDiagram
    class PdfReader {
        bool ShowToolbar
        bool EnableThumbnails
        string ViewHeight
        string StyleString
    }

    class CssBuilder {
        CssBuilder Default()
        CssBuilder AddClass(string value, bool when)
        CssBuilder AddClassFromAttributes(object additionalAttributes)
        string Build()
    }

    PdfReader ..> CssBuilder : builds StyleString

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Flow diagram for PdfReader toolbar rendering and CSS variable logic

flowchart TD
    Start[Start render PdfReader] --> CheckShowToolbar{ShowToolbar?}
    CheckShowToolbar -->|true| RenderToolbarContent[Render content inside div.bb-view-toolbar]
    CheckShowToolbar -->|false| SkipToolbarContent[Render empty div.bb-view-toolbar]

    Start --> BuildStyleString[Build StyleString with CssBuilder]
    BuildStyleString --> CheckShowToolbarStyle{ShowToolbar?}
    CheckShowToolbarStyle -->|true| NoToolbarHeightVar[Do not add --bb-pdf-toolbar-height]
    CheckShowToolbarStyle -->|false| AddToolbarHeightVar[Add CSS variable --bb-pdf-toolbar-height: 0;]

    RenderToolbarContent --> RenderMain[Render main PDF area]
    SkipToolbarContent --> RenderMain

    NoToolbarHeightVar --> RenderMain
    AddToolbarHeightVar --> RenderMain

    RenderMain --> End[Finish render PdfReader]

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File-Level Changes

Change	Details	Files
Always render the toolbar container but conditionally render its content based on ShowToolbar.	Move the ShowToolbar conditional check inside the toolbar container div instead of wrapping the entire toolbar block. Ensure the bb-view-toolbar wrapper div is always in the DOM to maintain consistent structure and layout with or without the toolbar content.	src/components/BootstrapBlazor.PdfReader/PdfReader.razor
Expose toolbar visibility to styles via a CSS variable derived from ShowToolbar.	Extend StyleString construction to include a --bb-pdf-toolbar-height CSS custom property when ShowToolbar is false, setting it to 0. Retain existing style composition using CssBuilder while augmenting it with the new conditional variable.	src/components/BootstrapBlazor.PdfReader/PdfReader.razor.cs

Assessment against linked issues

Issue	Objective	Addressed	Explanation
#740	Add (and wire up) a ShowToolbar parameter to the PdfReader component so that the toolbar can be conditionally shown/hidden without leaving layout space when hidden.	✅

Possibly linked issues

• feat(PdfReader): add ShowToolbar parameter #740: They match exactly: the PR adds and uses the PdfReader ShowToolbar parameter requested in the issue.

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[Copilot]

Pull request overview

This PR implements the ability to hide the toolbar in the PdfReader component by enhancing the existing ShowToolbar parameter. The feature allows users to toggle the visibility of the entire toolbar while maintaining proper layout calculations through CSS variables.

Key changes:

• Modified toolbar rendering to use CSS height control instead of conditional element rendering
• Set --bb-pdf-toolbar-height CSS variable to 0 when toolbar is hidden to adjust container height calculations
• Bumped version to 10.0.4-beta02

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
PdfReader.razor	Restructured toolbar div to always render with conditional content, enabling CSS-based height control
PdfReader.razor.cs	Added CSS variable override to set toolbar height to 0 when ShowToolbar is false
BootstrapBlazor.PdfReader.csproj	Version bump from 10.0.4-beta01 to 10.0.4-beta02

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