Bring your best Flutter app to life with the enhancements found in Volume 3: a new PDF Viewer, Signature Pad, and Excel library, not to mention box plot and waterfall charts, and a DataGrid that supports freezing panes and paging.
The following widgets have been developed to meet industrial standards and now marked as production-ready widgets for Flutter:
PDF Viewer lets you view PDF documents seamlessly and efficiently in Android and iOS platforms. It has highly interactive and customizable features such as magnification, virtual scrolling, pagination, and bookmark navigation.
Easily scroll through the pages in a document with a fluent experience. Pages are rendered only when required to increase loading and scrolling performance.
Content of the document can be zoomed in and out of efficiently.
Navigate to the desired pages instantly.
Bookmarks saved in the document are loaded and made ready for easy navigation. This feature helps in navigation within the PDF document of the topics bookmarked already.
Easily switch between light and dark themes.
All static text within the PDF Viewer can be localized to any supported language.
The SignaturePad widget allows you to capture smooth and more realistic signatures through drawing gestures. The widget also allows you to save the signature as an image, which can be further synchronized with your documents that need the signature.
The unique stroke rendering algorithm draws signatures based on the speed of the drawing gestures, along with the minimum and maximum stroke thicknesses, which brings a more realistic handwritten look and feel to your signature.
The stroke color of the SignaturePad widget can easily be customized.
The width of the signature stroke can be customized by setting the minimum and maximum stroke widths.
Save the drawn signature as an image to embed in documents, PDFs, and anything else that supports using images to denote a signature.
A new Flutter library to create Excel documents programmatically with cell values, built-in styles, cell formatting, formulas, charts, images, and more. Excel files can be created only in XLSX (Excel 2007 and above) format.
Flutter 
Display appointments across multiple days of a month on a horizontal axis where each column represents a single day.
Display the appointments of each resource in a discrete timeline view to enhance viewability.
Disable any date in a month and timeline month view of a calendar to make it inactive. Easily prevent the selection of weekends by disabling them.
Hide the next month and previous month dates in a calendar to enhance the appearance.
Navigate among calendar views easily using the header date picker, views button in the calendar header, and clicking month cell and view headers.
Render the following chart types:
The rendered chart can be exported and saved as a png image or pdf document for future use.
Display markers at data point positions when moving the trackball.
Place the trackball tooltips without intersecting each other.
Rearrange the data label by moving it vertically or horizontally.
Tap the data label text for notification.
Animate a rendered chart series again dynamically.
Select the data points in a chart dynamically.
Decide whether the axis range has to calculate based on visible data points or based on overall data points.
Load data in segments. It is useful when loading huge amounts of data.
Fix (freeze) columns on the left and right sides. Users can also fix (freeze) the rows at the top and bottom of a DataGrid.
Sort data in the ascending order and descending order.
Allows users to listen to callbacks for the following cell interactions,
An interactive tile layer allows you to load map tiles from web map tile services such as Bing Maps, OpenStreetMaps, Google Maps, TomTom, etc. Use markers to denote the specific latitude and longitude in the tile layer as required. Zoom and pan the tile layer to navigate across the regions and take a closer look.
Zoom in on the shape layer for a closer look at a specific region by pinching the map, scrolling the mouse wheel or track pad, or using the toolbar on the web. Pan the map to navigate across regions. You can also customize the zoom level and the center point of the initial rendering.
Customize the shape and bubble tooltips with the entirely customized widgets.
In addition to the legend for the shapes, now render legends for the bubbles, too. Use legends to provide clear information on the data plotted in the map. You can use the legend toggling feature to visualize only the data of the required region.
Smooth animations have been added for the shape interactions like legend toggling and selection. Also, use hover support for the web platform to include animations when hovering over bubbles and shapes to improve the UI experience.
The rendered gauge can be exported and saved as a png image or pdf document for future use.
The following UI improvements have been made based on the latest Material design guidelines:
The following UI improvements have been made based on the latest Material design guidelines:
The following UI improvements have been made based on the latest Material design guidelines:
Load and modify an existing PDF document by adding graphical objects to a page, adding a new page, and more.
Load an existing PDF document’s bookmarks with their destinations and modify them.
Create and load annotations in a new or existing PDF document. The following shape annotations are supported now: rectangle, ellipse, polygon, and line.
Extract text from an existing PDF document along with its bounds.
Find text in an existing PDF document along with its bounds and page index.
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