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// 13 december 2015
package ui
// #include <stdlib.h>
// #include "ui.h"
// extern void doAreaHandlerDraw(uiAreaHandler *, uiArea *, uiAreaDrawParams *);
// extern void doAreaHandlerMouseEvent(uiAreaHandler *, uiArea *, uiAreaMouseEvent *);
// extern void doAreaHandlerMouseCrossed(uiAreaHandler *, uiArea *, int);
// extern void doAreaHandlerDragBroken(uiAreaHandler *, uiArea *);
// extern int doAreaHandlerKeyEvent(uiAreaHandler *, uiArea *, uiAreaKeyEvent *);
// static inline uiAreaHandler *allocAreaHandler(void)
// {
// uiAreaHandler *ah;
//
// ah = (uiAreaHandler *) malloc(sizeof (uiAreaHandler));
// if (ah == NULL)
// return NULL;
// ah->Draw = doAreaHandlerDraw;
// ah->MouseEvent = doAreaHandlerMouseEvent;
// ah->MouseCrossed = doAreaHandlerMouseCrossed;
// ah->DragBroken = doAreaHandlerDragBroken;
// ah->KeyEvent = doAreaHandlerKeyEvent;
// return ah;
// }
// static inline void freeAreaHandler(uiAreaHandler *ah)
// {
// free(ah);
// }
import "C"
// no need to lock this; only the GUI thread can access it
var areahandlers = make(map[*C.uiAreaHandler]AreaHandler)
// AreaHandler defines the functionality needed for handling events
// from an Area.
type AreaHandler interface {
// TODO document all these
Draw(a *Area, dp *AreaDrawParams)
MouseEvent(a *Area, me *AreaMouseEvent)
MouseCrossed(a *Area, left bool)
DragBroken(a *Area)
KeyEvent(a *Area, ke *AreaKeyEvent) (handled bool)
}
func registerHandler(ah AreaHandler) *C.uiAreaHandler {
uah := C.allocAreaHandler()
areahandlers[uah] = ah
return uah
}
func unregisterAreaHandler(uah *C.uiAreaHandler) {
delete(areahandlers, uah)
C.freeAreaHandler(uah)
}
// AreaDrawParams defines the TODO.
type AreaDrawParams struct {
// TODO document all these
Context *DrawContext
AreaWidth float64
AreaHeight float64
ClipX float64
ClipY float64
ClipWidth float64
ClipHeight float64
}
//export doAreaHandlerDraw
func doAreaHandlerDraw(uah *C.uiAreaHandler, ua *C.uiArea, udp *C.uiAreaDrawParams) {
ah := areahandlers[uah]
a := areas[ua]
dp := &AreaDrawParams{
Context: &DrawContext{udp.Context},
AreaWidth: float64(udp.AreaWidth),
AreaHeight: float64(udp.AreaHeight),
ClipX: float64(udp.ClipX),
ClipY: float64(udp.ClipY),
ClipWidth: float64(udp.ClipWidth),
ClipHeight: float64(udp.ClipHeight),
}
ah.Draw(a, dp)
}
// TODO document all these
type AreaMouseEvent struct {
X float64
Y float64
AreaWidth float64
AreaHeight float64
Down uint
Up uint
Count uint
Modifiers Modifiers
Held []uint
}
func appendBits(out []uint, held C.uint64_t) []uint {
n := uint(1)
for i := 0; i < 64; i++ {
if held & 1 != 0 {
out = append(out, n)
}
held >>= 1
n++
}
return out
}
//export doAreaHandlerMouseEvent
func doAreaHandlerMouseEvent(uah *C.uiAreaHandler, ua *C.uiArea, ume *C.uiAreaMouseEvent) {
ah := areahandlers[uah]
a := areas[ua]
me := &AreaMouseEvent{
X: float64(ume.X),
Y: float64(ume.Y),
AreaWidth: float64(ume.AreaWidth),
AreaHeight: float64(ume.AreaHeight),
Down: uint(ume.Down),
Up: uint(ume.Up),
Count: uint(ume.Count),
Modifiers: Modifiers(ume.Modifiers),
Held: make([]uint, 0, 64),
}
me.Held = appendBits(me.Held, ume.Held1To64)
ah.MouseEvent(a, me)
}
//export doAreaHandlerMouseCrossed
func doAreaHandlerMouseCrossed(uah *C.uiAreaHandler, ua *C.uiArea, left C.int) {
ah := areahandlers[uah]
a := areas[ua]
ah.MouseCrossed(a, tobool(left))
}
//export doAreaHandlerDragBroken
func doAreaHandlerDragBroken(uah *C.uiAreaHandler, ua *C.uiArea) {
ah := areahandlers[uah]
a := areas[ua]
ah.DragBroken(a)
}
// TODO document all these
type AreaKeyEvent struct {
Key rune
ExtKey ExtKey
Modifier Modifiers
Modifiers Modifiers
Up bool
}
//export doAreaHandlerKeyEvent
func doAreaHandlerKeyEvent(uah *C.uiAreaHandler, ua *C.uiArea, uke *C.uiAreaKeyEvent) C.int {
ah := areahandlers[uah]
a := areas[ua]
ke := &AreaKeyEvent{
Key: rune(uke.Key),
ExtKey: ExtKey(uke.ExtKey),
Modifier: Modifiers(uke.Modifier),
Modifiers: Modifiers(uke.Modifiers),
Up: tobool(uke.Up),
}
return frombool(ah.KeyEvent(a, ke))
}
// TODO document
//
// Note: these must be numerically identical to their libui equivalents.
type Modifiers uint
const (
Ctrl Modifiers = 1 << iota
Alt
Shift
Super
)
// TODO document
//
// Note: these must be numerically identical to their libui equivalents.
type ExtKey int
const (
Escape ExtKey = iota + 1
Insert // equivalent to "Help" on Apple keyboards
Delete
Home
End
PageUp
PageDown
Up
Down
Left
Right
F1 // F1..F12 are guaranteed to be consecutive
F2
F3
F4
F5
F6
F7
F8
F9
F10
F11
F12
N0 // numpad keys; independent of Num Lock state
N1 // N0..N9 are guaranteed to be consecutive
N2
N3
N4
N5
N6
N7
N8
N9
NDot
NEnter
NAdd
NSubtract
NMultiply
NDivide
)
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