Exemplo n.º 1
0
// guiLoop runs the main GUI thread event loop in C++ land.
func guiLoop() {
	runtime.LockOSThread()
	guiLoopRef = tref.Ref()
	C.newGuiApplication()
	C.idleTimerInit(&hookWaiting)
	guiLoopReady.Unlock()
	C.applicationExec()
}
Exemplo n.º 2
0
// wrapGoValue creates a new GoValue object in C++ land wrapping
// the Go value contained in the given interface.
//
// This must be run from the main GUI thread.
func wrapGoValue(engine *Engine, gvalue interface{}, owner valueOwner) (cvalue unsafe.Pointer) {
	gvaluev := reflect.ValueOf(gvalue)
	gvaluek := gvaluev.Kind()
	if gvaluek == reflect.Struct && !hashable(gvalue) {
		name := gvaluev.Type().Name()
		if name != "" {
			name = " (" + name + ")"
		}
		panic("cannot hand an unhashable struct value" + name + " to QML logic; use its address instead")
	}
	if gvaluek == reflect.Ptr && gvaluev.Elem().Kind() == reflect.Ptr {
		panic("cannot hand pointer of pointer to QML logic; use a simple pointer instead")
	}

	painting := tref.Ref() == atomic.LoadUintptr(&guiPaintRef)

	prev, ok := engine.values[gvalue]
	if ok && (prev.owner == owner || owner != cppOwner || painting) {
		return prev.cvalue
	}

	if painting {
		panic("cannot allocate new objects while painting")
	}

	parent := nilPtr
	if owner == cppOwner {
		parent = engine.addr
	}
	fold := &valueFold{
		engine: engine,
		gvalue: gvalue,
		owner:  owner,
	}
	fold.cvalue = C.newGoValue(unsafe.Pointer(fold), typeInfo(gvalue), parent)
	if prev != nil {
		prev.next = fold
		fold.prev = prev
	} else {
		engine.values[gvalue] = fold
	}
	//fmt.Printf("[DEBUG] value alive (wrapped): cvalue=%x gvalue=%x/%#v\n", fold.cvalue, addrOf(fold.gvalue), fold.gvalue)
	stats.valuesAlive(+1)
	C.engineSetContextForObject(engine.addr, fold.cvalue)
	switch owner {
	case cppOwner:
		C.engineSetOwnershipCPP(engine.addr, fold.cvalue)
	case jsOwner:
		C.engineSetOwnershipJS(engine.addr, fold.cvalue)
	}
	return fold.cvalue
}
Exemplo n.º 3
0
//export hookGoValuePaint
func hookGoValuePaint(enginep, foldp unsafe.Pointer, reflectIndex C.intptr_t) {
	fold := ensureEngine(enginep, foldp)
	v := reflect.ValueOf(fold.gvalue)

	// The main GUI thread is mutex-locked while paint methods are called,
	// so no two paintings should be happening at the same time.
	atomic.StoreUintptr(&guiPaintRef, tref.Ref())

	painter := &Painter{fold.engine, &Common{fold.cvalue, fold.engine}}

	method := v.Method(int(reflectIndex))
	method.Call([]reflect.Value{reflect.ValueOf(painter)})

	atomic.StoreUintptr(&guiPaintRef, 0)
}
Exemplo n.º 4
0
// gui runs f in the main GUI thread and waits for f to return.
func gui(f func()) {
	ref := tref.Ref()
	if ref == guiLoopRef || ref == atomic.LoadUintptr(&guiPaintRef) {
		// Already within the GUI or render threads. Attempting to wait would deadlock.
		f()
		return
	}

	// Tell Qt we're waiting for the idle hook to be called.
	if atomic.AddInt32((*int32)(unsafe.Pointer(&hookWaiting)), 1) == 1 {
		C.idleTimerStart()
	}

	// Send f to be executed by the idle hook in the main GUI thread.
	guiFunc <- f

	// Wait until f is done executing.
	<-guiDone
}