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Enhance your Flutter apps with new Treemap and Linear Gauge widgets, web support for the PDF Viewer, null safety, and compatibility with desktop platforms.
The Flutter Linear Gauge is a data visualization widget that can be used to display data on a linear scale in either horizontal or vertical orientation.
Orientation - The Linear Gauge can be set to vertical or horizontal orientation.
Axis - The Linear Gauge axis is a scale where a set of values can be plotted. An axis can be customized by changing the thickness and edge styles. Users can also inverse the axis.
The Treemap is a data visualization widget that provides an effective way to visualize flat and hierarchical data as rectangles that are sized and colored based on quantitative variables.
Add any type of widgets (like text widget) to improve the readability of the individual tiles by providing brief descriptions on labels.
Use different layouts based on the algorithms such as squarified, slice, and dice to represent flat and hierarchically structured data.
Along with the flat level, treemap supports hierarchical structure too. Each tile of the treemap is a rectangle which is filled with smaller rectangles representing sub-data.
Categorize the tiles on the treemap by customizing their color based on the levels. It is possible to set the tile color for a specific value or for a range of values.
Display additional information about the tile using a completely customizable tooltip on the treemap.
Use different legend styles to provide information on the treemap data clearly.
Allows you to select the tiles to highlight it and do any specific functionalities like showing pop-up or navigate to a different page.
Add any type of custom widgets such as image widget as a background of the tiles to enrich the UI and easily visualize the type of data that a particular tile shows.
Loads appointments on demand whenever users switch from one view to another or when scrolling to the start or end position of the schedule view.
Enable or disable navigating the view with swipe interactions.
The current time indicator displays in the current time slot of the calendar.
Load a certain amount of data initially and then load more data lazily.
Display a fixed number of data points in the visible range and view the remaining data by panning.
The date-time category axis is a new x-axis type, a mixture of the date-time and category axes.
Like in the series tooltip, you can display markers in the trackball tooltip.
Change the trackball or crosshair position even after the touch interaction leaves the chart area.
Fill the circular chart data points with a gradient or image shader.
The circular chart rendering mode can be changed to gradient instead of solid colors.
This feature allows users to refresh data when the DataGrid is pulled down.
Swipe a row right to left or left to right for custom actions such as deleting, editing, and so on. When the user swipes a row, the row will be moved and the swipe view will show the custom actions.
Users can scroll to a specific row, column, or cell. Also, users can scroll a row or column based on offset values.
Display confirm and cancel buttons in the Date Range Picker and Hijri Date Range Picker to confirm or cancel the selected date values.
Enable or disable navigating the view with swipe interactions, navigating with free scrolling, and snapping in picker views.
Support has been provided for applying color to the inverted circle with the inner circle being transparent and the outer portion covered by an overlay color.
Support has been provided for applying color to the inverted polygon with the inner polygon being transparent and the outer portion covered by an overlay color.
The legend title support has been provided.
PDF Viewer now lets you view PDF documents seamlessly and efficiently on the web. It has highly interactive and customizable features such as magnification, virtual scrolling, pagination, text selection, text search, document link navigation, and bookmark navigation.
Use any custom widget as a pointer to point out a value in the circular scale.
Render a shadow to the pointer to elevate it from other elements in the gauge.
While dragging the marker pointer, display an overlay the same shape as the marker pointer’s.
Accessibility has been improved further to easily use thumbs and control the value changes using volume buttons.
Support has been provided to change the range slider orientation to a vertical layout.
Accessibility has been improved further to easily use thumbs and control the value changes using volume buttons.
Support has been provided to change the slider orientation to a vertical layout.
Some new features are included in the Flutter Excel library to generate more flexible and customized Excel reports.
Flutter 
Digitally sign a PDF document using .pfx certificates. The following digest algorithm and cryptographic standards are supported.
Digest algorithms:
Cryptographic standards:
Create, read, edit, fill, and flatten PDF forms. The PDF form supports the following types of fields.
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