Getting Started

Getting Started Creating your first Fyne app Run Fyne Demo Application and RunLoop Updating Content in your GUI Window Handling Testing Graphical Apps Packaging for Desktop Mobile Packaging Run in a Browser App Metadata Distributing to App Stores Compiling for different platforms

Exploring Fyne

Canvas and CanvasObject Container and Layouts Widget List Layout List Dialog List Theme Icons Adding Shortcuts to an App Using the Preferences API Adding app translations System Tray Menu Data Binding Compile Options

Drawing and Animation

Rectangle Text Line Circle Image Raster Gradient Animation

Containers and Layout

Box Grid Grid Wrap Border Form Center Max AppTabs

Widgets

Label Button Entry Choices Form ProgressBar Toolbar

Collections

List Table Tree

Data Binding

Data Binding Binding Simple Widgets Two-Way Binding Data Conversion List Data

Extending Fyne

Building a Custom Layout Writing a Custom Widget Bundling resources Creating a Custom Theme Extending Widgets Numerical Entry

Architecture

Geometry Scaling Widgets Organisation and Packages

Frequently Asked Questions

Layout and Widget Size Theme and Customisation Troubleshooting

API Documentation

Upgrade to v2.5 Fyne API v2.5

package fyne Animation AnimationCurve App AppMetadata BuildType Canvas CanvasObject Clipboard CloudProvider CloudProviderPreferences CloudProviderStorage Container Delta Device DeviceOrientation Disableable DoubleTappable DragEvent Draggable Driver Focusable HardwareKey KeyboardShortcut KeyEvent KeyModifier KeyName Layout LegacyTheme Lifecycle ListableURI Locale MainMenu Menu MenuItem Notification OverlayStack PointEvent Position Preferences Resource Scrollable ScrollEvent SecondaryTappable Settings Shortcut Shortcutable ShortcutCopy ShortcutCut ShortcutHandler ShortcutPaste ShortcutRedo ShortcutSelectAll ShortcutUndo Size StaticResource Storage StringValidator Tabbable Tappable TextAlign TextStyle TextTruncation TextWrap Theme ThemeColorName ThemedResource ThemeIconName ThemeSizeName ThemeVariant URI URIReadCloser URIWithIcon URIWriteCloser Validatable Vector2 Widget WidgetRenderer Window

app canvas container data/binding data/validation dialog driver driver/desktop driver/mobile driver/software lang layout storage storage/repository test theme widget

List My App

Fyne API "fyne.Validatable"

fyne.Validatable

import "fyne.io/fyne/v2"

Usage

type Validatable

type Validatable interface {
	Validate() error

	// SetOnValidationChanged is used to set the callback that will be triggered when the validation state changes.
	// The function might be overwritten by a parent that cares about child validation (e.g. widget.Form).
	SetOnValidationChanged(func(error))
}

Validatable is an interface for specifying if a widget is validatable.

Since:

1.4

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