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// SPDX-License-Identifier: Unlicense OR MIT
package app
import (
"gioui.org/app/internal/window"
)
// JavaVM returns the global JNI JavaVM.
func JavaVM() uintptr {
return window.JavaVM()
}
// AppContext returns the global Application context as a JNI
// jobject.
func AppContext() uintptr {
return window.AppContext()
}
// Do invokes the function with a JNI jobject handle to the underlying
// Android View. The function is invoked on the main thread, and the
// handle is invalidated after the function returns.
//
// Note: Do may deadlock if called from the same goroutine that receives from
// Events.
func (w *Window) Do(f func(view uintptr)) {
type androidDriver interface {
Do(f func(view uintptr)) bool
}
success := make(chan bool)
for {
driver := make(chan androidDriver, 1)
// two-stage process: first wait for a valid driver...
w.driverDo(func() {
driver <- w.driver.(androidDriver)
})
// .. then run the function on the main thread using the
// driver. The driver Do method returns false if the
// view was invalidated while switching to the main thread.
window.RunOnMain(func() {
d := <-driver
success <- d.Do(f)
})
if <-success {
break
}
}
}
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