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// 29 march 2014
package ui
import (
"fmt"
"unsafe"
"image"
)
// #cgo LDFLAGS: -lobjc -framework Foundation -framework AppKit
// #include <stdlib.h>
//// #include <HIToolbox/Events.h>
// #include "objc_darwin.h"
// extern void areaView_drawRect(id, struct xrect);
// extern BOOL areaView_isFlipped(id, SEL);
import "C"
const (
__goArea = "goArea"
)
var (
_goArea C.id
_drawRect = sel_getUid("drawRect:")
_isFlipped = sel_getUid("isFlipped")
)
func mkAreaClass() error {
areaclass, err := makeAreaClass(__goArea)
if err != nil {
return fmt.Errorf("error creating Area backend class: %v", err)
}
// addAreaViewDrawMethod() is in bleh_darwin.m
ok := C.addAreaViewDrawMethod(areaclass)
if ok != C.BOOL(C.YES) {
return fmt.Errorf("error overriding Area drawRect: method; reason unknown")
}
// TODO rename this function (it overrides anyway)
err = addDelegateMethod(areaclass, _isFlipped,
C.areaView_isFlipped, area_boolret)
if err != nil {
return fmt.Errorf("error overriding Area isFlipped method: %v", err)
}
_goArea = objc_getClass(__goArea)
return nil
}
var (
_drawAtPoint = sel_getUid("drawAtPoint:")
)
//export areaView_drawRect
func areaView_drawRect(self C.id, rect C.struct_xrect) {
s := getSysData(self)
// TODO clear clip rect
cliprect := image.Rect(int(rect.x), int(rect.y), int(rect.width), int(rect.height))
max := C.objc_msgSend_stret_rect_noargs(self, _frame)
cliprect = image.Rect(0, 0, int(max.width), int(max.height)).Intersect(cliprect)
if cliprect.Empty() { // no intersection; nothing to paint
return
}
i := s.handler.Paint(cliprect)
C.drawImage(
unsafe.Pointer(&i.Pix[0]), C.int64_t(i.Rect.Dx()), C.int64_t(i.Rect.Dy()), C.int64_t(i.Stride),
C.int64_t(cliprect.Min.X), C.int64_t(cliprect.Min.Y))
}
//export areaView_isFlipped
func areaView_isFlipped(self C.id, sel C.SEL) C.BOOL {
return C.BOOL(C.YES)
}
// TODO combine these with the listbox functions?
func newAreaScrollView(area C.id) C.id {
scrollview := objc_alloc(_NSScrollView)
scrollview = objc_msgSend_rect(scrollview, _initWithFrame,
0, 0, 100, 100)
C.objc_msgSend_bool(scrollview, _setHasHorizontalScroller, C.BOOL(C.YES))
C.objc_msgSend_bool(scrollview, _setHasVerticalScroller, C.BOOL(C.YES))
C.objc_msgSend_bool(scrollview, _setAutohidesScrollers, C.BOOL(C.YES))
C.objc_msgSend_id(scrollview, _setDocumentView, area)
return scrollview
}
func areaInScrollView(scrollview C.id) C.id {
return C.objc_msgSend_noargs(scrollview, _documentView)
}
func makeArea(parentWindow C.id, alternate bool) C.id {
area := objc_alloc(_goArea)
area = objc_msgSend_rect(area, _initWithFrame,
0, 0, 100, 100)
// TODO others?
area = newAreaScrollView(area)
addControl(parentWindow, area)
return area
}
// TODO combine the below with the delegate stuff
var (
_NSView = objc_getClass("NSView")
_NSView_Class = C.Class(unsafe.Pointer(_NSView))
)
func makeAreaClass(name string) (C.Class, error) {
cname := C.CString(name)
defer C.free(unsafe.Pointer(cname))
c := C.objc_allocateClassPair(_NSView_Class, cname, 0)
if c == C.NilClass {
return C.NilClass, fmt.Errorf("unable to create Objective-C class %s for Area; reason unknown", name)
}
C.objc_registerClassPair(c)
return c, nil
}
var (
area_boolret = []C.char{'c', '@', ':', 0} // BOOL (*)(id, SEL)
)
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