77 lines
1.6 KiB
Go
77 lines
1.6 KiB
Go
// +build !windows,!darwin,!plan9
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// 16 february 2014
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package ui
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import (
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"fmt"
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"unsafe"
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)
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// #cgo pkg-config: gtk+-3.0
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// #include "gtk_unix.h"
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// /* this is called when we're done */
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// static inline gboolean our_quit_callback(gpointer data)
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// {
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// gtk_main_quit();
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// return FALSE; /* remove from idle handler queue (not like it matters) */
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// }
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// /* I would call gdk_threads_add_idle() directly from ui() but cgo whines, so; trying to access our_quit_callback() in any way other than a call would cause _cgo_main.c to complain too */
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// static inline void signalQuit(void)
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// {
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// gdk_threads_add_idle(our_quit_callback, NULL);
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// }
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// extern gboolean our_post_callback(gpointer);
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import "C"
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func uiinit() error {
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err := gtk_init()
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if err != nil {
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return fmt.Errorf("gtk_init() failed: %v", err)
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}
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return nil
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}
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func ui() {
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go func() {
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<-Stop
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C.signalQuit()
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// TODO wait for it to return?
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}()
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C.gtk_main()
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}
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// we DO need to worry about keeping data alive here
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// so we do the posting in a new goroutine that waits instead
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type uipostmsg struct {
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w *Window
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data interface{}
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done chan struct{}
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}
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//export our_post_callback
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func our_post_callback(xmsg C.gpointer) C.gboolean {
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msg := (*uipostmsg)(unsafe.Pointer(xmsg))
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msg.w.sysData.post(msg.data)
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msg.done <- struct{}{}
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return C.FALSE // remove from idle handler queue
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}
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func uipost(w *Window, data interface{}) {
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go func() {
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msg := &uipostmsg{
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w: w,
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data: data,
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done: make(chan struct{}),
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}
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C.gdk_threads_add_idle(C.GSourceFunc(C.our_post_callback),
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C.gpointer(unsafe.Pointer(msg)))
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<-msg.done
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close(msg.done)
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}()
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}
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