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If you are a Flutter developer, you must have encountered the DropdownButton widget at some point. We will look into flutter dropdownbutton box around button design guides. DropdownButton is a powerful widget that lets users choose from a list of items. It is commonly used in forms and other scenarios where users must select an option from a list. However, the default styling of DropdownButton may not always fit your application’s requirements. This article will show you how to style DropdownButton in Flutter to make it look more appealing and match your application’s design.

Basic DropdownButton Styling

The first thing you may want to do is to change the color and background of the DropdownButton widget. You can do this by setting the color and background properties of the DropdownButton widget. For example, if you want to set the color of the text to white and the background color to blue, you can use the following code:

In this code, we set the style property to TextStyle(color: Colors.white) to set the color of the text to white. We also set the dropdownColor property to Colors.blue to set the background color of the DropdownButton to blue.

Custom DropdownButton Styling

If you want to customize the DropdownButton further, use the dropdownButtonBuilder property. The dropdownButtonBuilder property is a function that takes a BuildContext and a DropdownButtonFormFieldState as arguments and returns a widget. You can use this function to build a custom DropdownButton widget.

We use the dropdownButtonBuilder property in this code to build a custom DropdownButton widget. We wrap the DropdownButton widget in a Container widget to set its background color and border radius. We also add padding to the container and set the mainAxisAlignment property of the Row widget to MainAxisAlignment.spaceBetween to position the text and icon correctly. Finally, we set the style of the text to TextStyle(color: Colors.black) to make it more visible.

Using Custom DropdownButton Styles

Flutter allows developers to customize the appearance of a DropdownButton widget by providing a DropdownButtonStyle property. This property allows us to customize the look of the dropdown button, its menu, and its menu items. We can customize the dropdown button’s text, background, border, and other properties.

Let’s start by defining a custom DropdownButtonStyle object. We can use the DropdownButton constructor’s style property to set the custom style. Here is an example:

In this example, we defined a custom DropdownButtonStyle object with blue text color and a blue underline. We also defined a custom onChanged callback function that updates the _selectedItem variable when the user selects a new item from the dropdown menu.

Customizing the DropdownButton Icon

By default, the DropdownButton widget shows a downward-pointing arrow icon on the right side of the dropdown button. We can customize this icon by providing a dropdownIcon property to the DropdownButton constructor. Here is an example:

In this example, we defined a custom property with a blue downward-pointing arrow icon. We can also use any other icon from the Material Icons library provided by Flutter.

How to set Gradient Background color on DropdownButton

To set a gradient background color on a DropdownButton in Flutter, you can use the BoxDecoration widget and the gradient property to define your gradient.

Here is an example code snippet:

In the above example, we are setting the gradient property of the BoxDecoration to a LinearGradient that starts with blue at the top and transitions to purple at the bottom. The begin and end properties of the LinearGradient specify the starting and ending points of the gradient, respectively.

You can customize the gradient colors and direction as per your requirement.

Full Example

Here’s a full example of how to create a DropdownButton with a gradient background color in Flutter:

In this example, we have created a Gradient Background using BoxDecoration and LinearGradient widgets. We have set the colors property of the LinearGradient to [Colors.blue, Colors.purple] which creates a gradient that transitions from blue to purple. We have also set the begin and end properties of the LinearGradient to specify the direction of the gradient.

Next, we have created a DropdownButton widget and set its icon, iconSize, underline, style, value, items, and onChanged properties. We have set the style property to TextStyle with a color of white to match the gradient background.

Finally, we have wrapped the DropdownButton inside a Container with the gradient background. This creates the effect of a DropdownButton with a gradient background color.