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tomo-old/backends/x/x.go
Sasha Koshka 2c55824920 Made the clipboard API a bit better
This should work better with the X clipboard system better when I
eventually make use of that.
2023-01-30 00:54:06 -05:00

104 lines
2.3 KiB
Go

package x
import "git.tebibyte.media/sashakoshka/tomo"
import "github.com/jezek/xgbutil"
import "github.com/jezek/xgb/xproto"
import "github.com/jezek/xgbutil/xevent"
// Backend is an instance of an X backend.
type Backend struct {
connection *xgbutil.XUtil
doChannel chan(func ())
modifierMasks struct {
capsLock uint16
shiftLock uint16
numLock uint16
modeSwitch uint16
alt uint16
meta uint16
super uint16
hyper uint16
}
windows map[xproto.Window] *Window
}
// NewBackend instantiates an X backend.
func NewBackend () (output tomo.Backend, err error) {
backend := &Backend {
windows: map[xproto.Window] *Window { },
doChannel: make(chan func (), 0),
}
// connect to X
backend.connection, err = xgbutil.NewConn()
if err != nil { return }
backend.initializeKeymapInformation()
output = backend
return
}
// Run runs the backend's event loop. This method will not exit until Stop() is
// called, or the backend experiences a fatal error.
func (backend *Backend) Run () (err error) {
backend.assert()
pingBefore,
pingAfter,
pingQuit := xevent.MainPing(backend.connection)
for {
select {
case <- pingBefore:
<- pingAfter
case callback := <- backend.doChannel:
callback()
case <- pingQuit:
return
}
}
}
// Stop gracefully closes the connection and stops the event loop.
func (backend *Backend) Stop () {
backend.assert()
for _, window := range backend.windows {
window.Close()
}
xevent.Quit(backend.connection)
backend.connection.Conn().Close()
}
// Do executes the specified callback within the main thread as soon as
// possible. This function can be safely called from other threads.
func (backend *Backend) Do (callback func ()) {
backend.assert()
backend.doChannel <- callback
}
// Copy puts data into the clipboard. This method is not yet implemented and
// will do nothing!
func (backend *Backend) Copy (data tomo.Data) {
backend.assert()
// TODO
}
// Paste returns the data currently in the clipboard. This method may
// return nil. This method is not yet implemented and will do nothing!
func (backend *Backend) Paste (accept []tomo.Mime) (data tomo.Data) {
backend.assert()
// TODO
return
}
func (backend *Backend) assert () {
if backend == nil { panic("nil backend") }
}
func init () {
tomo.RegisterBackend(NewBackend)
}