This custom view requires Rsize and rndButton classses which I did a while ago they are in the demo. I have commented quite a lot, and the demo is also commented. This control can be used for selecting options or performing actual tasks. I have demo'd some of them in the example. You can also set text of buttons, text color which can be different for each button or same for all using 99 in the call. I have added properties to change the border color (you can also make the border transparent) and the button state colors for enabled, pressed, disabled. I struggled a little how to set the number of buttons so I used the tag value of the custom view when added to the designer to hold the number of buttons (the more buttons you have might restrict the amount of space you have for e demo). The text of the buttons resizes as required. The selected button changes color and shrinks to indicate selection. So, even though a button might visually be 36px in height, it might still take up to 48px vertically. This is because most buttons adhere to the MaterialTapTargetSize of 48px. Note that the button spacing may appear to be more than the value provided. There is also a "clr" button to reset all the buttons to enabled state. This parameter provides additional vertical space in between buttons when it does overflow. This custom control consists of as many buttons as you need for making a unique selection. I have found using radiobuttons a bit of a chore and they tend to use a bit of screen real estate along with the handlers required. If you give too much bottomScreenPadding but less height in the custom widget or vice versa, layout issues might appear.įor better understanding, refer to the example project in the official git repo.I am not sure if b4a has a buttonBar or not but I made this one. To control the bottom padding of the screen, use bottomScreenPadding. NOTE: In the 'onSelected' function of the customWidget, don't forgot to change the index of the controllerÄone! As we can see, some of the other properties like iconSize, items are not required here so you can skip those properties. _controller.index = index // NOTE: THIS IS CRITICAL!! Don't miss it! Following is an example for demonstration purposes:Ĭonst MyApp() // This is required to update the nav bar if Android back button is pressedĬustomWidget: CustomNavBarWidget( // Your custom widget goes here NOTE: This widget includes SCAFFOLD (based on CupertinoTabScaffold), so no need to declare it. The last step is to use this new /drawable/deletewithpadding. Obviously, you can adjust the 4dp padding values on each side for your needs. The main widget then to be declared is PersistentTabView. This XML drawable will have four padding items, one for each side, and the lastly a bitmap to the icon we've used in the original menu item declaration. _controller = PersistentTabController(initialIndex: 0) Here is how to declare it: PersistentTabController _controller Persistent bottom navigation bar uses PersistentTabController as its controller. Import the package: import 'package:persistent_bottom_nav_bar/persistent_tab_view.dart' Following is a full example to demonstrate the use of above tip to center a button on screen. android:layoutcenterVertical'true' android:layoutcenterHorizontal'true'. Wrap button in RelativeLayout, and set following attributes to true. In your flutter project add the dependency: dependencies: Depending on whether you want a button with text, an icon, or both, you can create the button in your layout in three ways: With text, using the Button class:
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