forked from joejulian/gio
Elias Naur
3944ef4b2e
Event handling is as fundamental as operations, so move the input package declarations to package ui. Signed-off-by: Elias Naur <mail@eliasnaur.com>
66 lines
1.5 KiB
Go
66 lines
1.5 KiB
Go
// SPDX-License-Identifier: Unlicense OR MIT
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/*
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Package app provides a platform-independent interface to operating system
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functionality for running graphical user interfaces.
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Windows
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Create a new Window by calling NewWindow. On mobile platforms or when Gio
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is embedded in another project, NewWindow merely connects with a previously
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created window.
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A Window is run by receiving events from its Events channel. The most
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important event is UpdateEvent that prompts an update of the window
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contents and state.
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For example:
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import "gioui.org/ui"
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w := app.NewWindow()
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for e := range w.Events() {
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if e, ok := e.(app.UpdateEvent); ok {
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ops.Reset()
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// Add operations to ops.
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...
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// Completely replace the window contents and state.
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w.Update(ops)
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}
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}
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A program must keep receiving events from the event channel until
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DestroyEvent is received.
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Main
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The Main function must be called from a programs main function, to hand over
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control of the main thread to operating systems that need it.
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Because Main is also blocking, the event loop of a Window must run in a goroutine.
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For example, to display a blank but otherwise functional window:
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package main
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import "gioui.org/ui/app"
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func main() {
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go func() {
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w := app.NewWindow()
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for range w.Events() {
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}
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}()
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app.Main()
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}
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Event queue
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A Window's Queue method returns an ui.Queue implementation that distributes
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incoming events to the event handlers declared in the latest call to Update.
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See the gioui.org/ui package for more information about event handlers.
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*/
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package app
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