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// SPDX-License-Identifier: Unlicense OR MIT
// Package window implements platform specific windows
// and GPU contexts.
package window
import (
"errors"
"gioui.org/gpu/backend"
"gioui.org/io/event"
"gioui.org/io/system"
"gioui.org/unit"
)
type Options struct {
Width, Height unit.Value
MinWidth, MinHeight unit.Value
MaxWidth, MaxHeight unit.Value
Title string
}
type FrameEvent struct {
system.FrameEvent
Sync bool
}
type Callbacks interface {
SetDriver(d Driver)
Event(e event.Event)
}
type Context interface {
Backend() (backend.Device, error)
Present() error
MakeCurrent() error
Release()
Lock()
Unlock()
}
// ErrDeviceLost is returned from Context.Present when
// the underlying GPU device is gone and should be
// recreated.
var ErrDeviceLost = errors.New("GPU device lost")
// Driver is the interface for the platform implementation
// of a window.
type Driver interface {
// SetAnimating sets the animation flag. When the window is animating,
// FrameEvents are delivered as fast as the display can handle them.
SetAnimating(anim bool)
// ShowTextInput updates the virtual keyboard state.
ShowTextInput(show bool)
NewContext() (Context, error)
// ReadClipboard requests the clipboard content.
ReadClipboard()
// WriteClipboard requests a clipboard write.
WriteClipboard(s string)
// Close the window.
Close()
}
type windowRendezvous struct {
in chan windowAndOptions
out chan windowAndOptions
errs chan error
}
type windowAndOptions struct {
window Callbacks
opts *Options
}
func newWindowRendezvous() *windowRendezvous {
wr := &windowRendezvous{
in: make(chan windowAndOptions),
out: make(chan windowAndOptions),
errs: make(chan error),
}
go func() {
var main windowAndOptions
var out chan windowAndOptions
for {
select {
case w := <-wr.in:
var err error
if main.window != nil {
err = errors.New("multiple windows are not supported")
}
wr.errs <- err
main = w
out = wr.out
case out <- main:
}
}
}()
return wr
}
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