Example #1
0
File: bridge.go Project: hahaya/qml
// 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) {

	// TODO Return an error if gvalue is a non-basic type and not a pointer.
	//      Pointer-to-pointer is also not okay.
	prev, ok := engine.values[gvalue]
	if ok && (prev.owner == owner || owner != cppOwner) {
		return prev.cvalue
	}

	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
	}
	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
}
Example #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 := cdata.Ref() == atomic.LoadUintptr(&guiPaintRef)

	// Cannot reuse a jsOwner because the QML runtime may choose to destroy
	// the value _after_ we hand it a new reference to the same value.
	// See issue #68 for details.
	prev, ok := engine.values[gvalue]
	if ok && (prev.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 {
		// Put new fold first so the single cppOwner, if any, is always the first entry.
		fold.next = prev
		prev.prev = fold
	}
	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
}
Example #3
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
}
Example #4
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) {
	prev, ok := engine.values[gvalue]
	if ok && (prev.owner == owner || owner != cppOwner) {
		return prev.cvalue
	}

	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")
	}

	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
	}
	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
}