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CONSTRA Document Viewer & Annotation | Construction Document Viewer | Construction Annotation System | Construction ERP Suite

by
Odoo

$ 1073.81

v 19.0 Third Party
Availability
Odoo Online
Odoo.sh
On Premise
Odoo Apps Dependencies • Discuss (mail)
• Employees (hr)
• Inventory (stock)
• Invoicing (account)
• Maintenance (maintenance)
• Project (project)
• Purchase (purchase)
Community Apps Dependencies
Lines of code 13258
Technical Name constra_viewer
LicenseLGPL-3
Websitehttps://bbtech.ae
Versions 18.0 19.0
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Availability
Odoo Online
Odoo.sh
On Premise
Odoo Apps Dependencies • Discuss (mail)
• Employees (hr)
• Inventory (stock)
• Invoicing (account)
• Maintenance (maintenance)
• Project (project)
• Purchase (purchase)
Community Apps Dependencies
Lines of code 13258
Technical Name constra_viewer
LicenseLGPL-3
Websitehttps://bbtech.ae
Versions 18.0 19.0
Fabric.js 5.3 11 Drawing Tools OWL 3.x

CONSTRA

Document Viewer & Annotation Engine

A full-featured inline document viewer and annotation engine built on Fabric.js. Open any PDF or image attachment directly inside Odoo, mark it up with 11 professional drawing tools, add comments, and save versioned annotated copies — without ever modifying the original file.

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CONSTRA Document Viewer & Annotation
11
Drawing Tools
5
Supported Record Types
PDF+IMG
File Support
PNG/SVG
Export Formats

Key Features

Professional-grade annotation tools built directly into Odoo. No external software needed.

11 Drawing Tools

Select, Pan, Rectangle, Circle, Freehand Pencil, Text, Arrow, Dimension Line, Callout, Polygon, and Cloud markup tools for every annotation scenario.

Layer Management

Organize annotations on layers. Show, hide, lock, or reorder layers to keep complex markup organized and easy to review.

Comments & Threads

Pin comments directly on the drawing. Start threaded discussions tied to specific locations on the document for contextual collaboration.

Save-As Versioning

Every save creates a new versioned copy (AV1, AV2, AV3...). The original file is never modified. Access all versions from the Annotated Versions button.

PDF & Image Support

Open PDFs (multi-page via PDF.js) and image files (PNG, JPG, TIFF) directly in the viewer. Navigate pages and annotate any page independently.

Export PNG / SVG

Export annotated documents as high-resolution PNG or scalable SVG files for sharing, printing, or attaching to reports and transmittals.

How It Works

Three steps from document to annotated, versioned markup.

1
Open from Any Record

Click the annotation button on any supported record — Shop Drawings, RFIs, NCRs, Inspections, or Tasks. The viewer opens inline as an OWL client action.

2
Annotate & Comment

Use any of the 11 drawing tools to mark up the document. Add dimension lines, callouts, cloud markups, freehand sketches, text labels, and pinned comments.

3
Save Versioned Copy

Hit Save to create a versioned annotated copy (filename-AV1.png, filename-AV2.png). The original document is always protected and never overwritten.

Works With Your Existing Records

The annotation viewer integrates directly into 5 CONSTRA record types via inherited views.

Shop Drawings
RFIs
NCRs
Inspections
Tasks

11 Professional Annotation Tools

A complete markup toolkit designed for construction document review workflows.

Select

Click to select, move, resize, and rotate objects on the canvas

Pan

Click and drag to navigate around the document viewport

Rectangle

Draw rectangles to highlight areas or frame document sections

Circle

Draw ellipses and circles to mark specific points of interest

Pencil

Freehand drawing for sketches, redlines, and quick annotations

Text

Add text labels, notes, and descriptions anywhere on the document

Arrow

Draw directional arrows to point out specific details or issues

Dimension

Add dimension lines with measurement labels for technical review

Callout

Add callout boxes with leader lines pointing to specific areas

Polygon

Draw multi-point polygons for irregular area highlighting

Cloud

Industry-standard revision cloud markup for highlighting changes

Version Control

Original Protected. Every Save Creates a New Version.

The annotation engine never modifies the original attachment. Each time you save, a new annotated version is created with an automatic version suffix. This gives you a complete history of all markups while keeping the source document intact.

  • Original file is never modified or overwritten
  • First save creates filename-AV1.png
  • Subsequent saves create AV2, AV3, AV4... automatically
  • All versions accessible from Annotated Versions button
  • Full version history with timestamps and user tracking
shop-drawing-MEP-01.pdf
Original — Protected
Original
shop-drawing-MEP-01-AV1.png
Ahmad — 2 days ago
AV1
shop-drawing-MEP-01-AV2.png
Sara — 1 day ago
AV2
shop-drawing-MEP-01-AV3.png
Ahmad — Just now
AV3 (Latest)

See It in Action

The annotation viewer with toolbar, drawing canvas, and comment sidebar.

CONSTRA Document Viewer Screenshot

Technical Specifications

Built on cutting-edge client-side technology within the Odoo framework.

Canvas Engine

Fabric.js 5.3 — high-performance HTML5 canvas with object model and event system

Frontend Framework

OWL 3.x client action with dedicated components for viewer, toolbar, and sidebar

Data Transport

fetch() RPC calls for fast, asynchronous communication between client and server

PDF Rendering

PDF.js for multi-page PDF rendering with per-page annotation support

Platform

Odoo Community & Enterprise, Python 3.11+

Dependencies

constra_core, constra_ops, mail, web

Architecture

3 OWL components: ConstraViewer, AnnotationToolbar, AnnotationSidebar

Security

Role-based access control with project-level security rules

About the Author

Binary Bridge Technology Services

We are a specialist Odoo partner focused on construction, contracting, and project-based industries. With 15+ years of ERP implementation experience, we build purpose-built solutions that construction companies actually use.

Support & Services
Dedicated Support
Customization
Training
Cloud Hosting

Complete Feature List

Every feature included in CONSTRA Document Viewer & Annotation Engine.

  • 11 professional drawing and markup tools
  • Fabric.js 5.3 canvas engine
  • OWL 3.x client action architecture
  • Multi-page PDF support via PDF.js
  • PNG, JPG, and TIFF image support
  • Export to PNG and SVG formats
  • Save-As versioning (AV1, AV2, AV3...)
  • Original file protection (never modified)
  • Layer management and organization
  • Pinned comments and threaded discussions
  • Revision cloud markup tool
  • Dimension line with measurement labels
  • Shop Drawing annotation integration
  • RFI annotation integration
  • NCR annotation integration
  • Inspection annotation integration
  • Task annotation integration
  • Odoo & Python 3.11 compatible

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