61 lines
1.5 KiB
Go
61 lines
1.5 KiB
Go
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// 11 december 2015
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package ui
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import (
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"errors"
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)
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// #include "interop.h"
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import "C"
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// Main initializes package ui, runs f to set up the program,
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// and executes the GUI main loop. f should set up the program's
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// initial state: open the main window, create controls, and set up
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// events. It should then return, at which point Main will
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// process events until Quit is called, at which point Main will return
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// nil. If package ui fails to initialize, Main returns an appropriate
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// error.
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func Main(f func()) error {
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errchan := make(chan error)
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go start(errchan, f)
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return <-errchan
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}
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func start(errchan chan error, f func()) {
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estr := C.interopInit()
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if estr != "" {
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errchan <- errors.New(C.GoString(estr))
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C.interopFreeStr(estr)
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return
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}
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QueueMain(f)
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C.interopRun()
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errchan <- nil
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}
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// Quit queues an exit from the GUI thread. It does not exit the
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// program. Quit must be called from the GUI thread.
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func Quit() {
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C.interopQuit()
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}
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// QueueMain queues f to be executed on the GUI thread when
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// next possible. It returns immediately; that is, it does not wait
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// for the function to actually be executed. QueueMain is the only
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// function that can be called from other goroutines, and its
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// primary purpose is to allow communication between other
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// goroutines and the GUI thread. Calling QueueMain after Quit
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// has been called results in undefined behavior.
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func QueueMain(f func()) {
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n := interoperAdd(f)
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C.interopQueueMain(n)
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}
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//export interopDoQueued
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func interopDoQueued(n C.uintptr_t) {
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ff := interoperTake(n)
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f := ff.(func())
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f()
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}
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