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// SPDX-License-Identifier: Unlicense OR MIT
/*
Package app provides a platform-independent interface to operating system
functionality for running graphical user interfaces.
See https://gioui.org for instructions to set up and run Gio programs.
Windows
Create a new Window by calling NewWindow. On mobile platforms or when Gio
is embedded in another project, NewWindow merely connects with a previously
created window.
A Window is run by receiving events from its Events channel. The most
important event is FrameEvent that prompts an update of the window
contents and state.
For example:
import "gioui.org/unit"
w := app.NewWindow()
for e := range w.Events() {
if e, ok := e.(system.FrameEvent); ok {
ops.Reset()
// Add operations to ops.
...
// Completely replace the window contents and state.
e.Frame(ops)
}
}
A program must keep receiving events from the event channel until
DestroyEvent is received.
Main
The Main function must be called from a program's main function, to hand over
control of the main thread to operating systems that need it.
Because Main is also blocking on some platforms, the event loop of a Window must run in a goroutine.
For example, to display a blank but otherwise functional window:
package main
import "gioui.org/app"
func main() {
go func() {
w := app.NewWindow()
for range w.Events() {
}
}()
app.Main()
}
Event queue
A FrameEvent's Queue method returns an event.Queue implementation that distributes
incoming events to the event handlers declared in the last frame.
See the gioui.org/io/event package for more information about event handlers.
Permissions
The packages under gioui.org/app/permission should be imported
by a Gio program or by one of its dependencies to indicate that specific
operating-system permissions are required. Please see documentation for
package gioui.org/app/permission for more information.
*/
package app