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// 12 july 2014
package ui
import (
"fmt"
"syscall"
"unsafe"
)
// #include "winapi_windows.h"
import "C"
type window struct {
hwnd C.HWND
shownbefore bool
child Control
closing *event
spaced bool
}
const windowclassname = ""
var windowclassptr = syscall.StringToUTF16Ptr(windowclassname)
func makeWindowWindowClass() error {
var errmsg *C.char
err := C.makeWindowWindowClass(&errmsg)
if err != 0 || errmsg != nil {
return fmt.Errorf("%s: %v", C.GoString(errmsg), syscall.Errno(err))
}
return nil
}
func newWindow(title string, width int, height int) *Request {
c := make(chan interface{})
return &Request{
op: func() {
w := &window{
// hwnd set in WM_CREATE handler
closing: newEvent(),
}
hwnd := C.newWindow(toUTF16(title), C.int(width), C.int(height), unsafe.Pointer(w))
if hwnd != w.hwnd {
panic(fmt.Errorf("inconsistency: hwnd returned by CreateWindowEx() (%p) and hwnd stored in window (%p) differ", hwnd, w.hwnd))
}
c <- w
},
resp: c,
}
}
func (w *window) SetControl(control Control) *Request {
c := make(chan interface{})
return &Request{
op: func() {
if w.child != nil { // unparent existing control
w.child.unparent()
}
control.unparent()
control.parent(w)
w.child = control
c <- struct{}{}
},
resp: c,
}
}
func (w *window) Title() *Request {
c := make(chan interface{})
return &Request{
op: func() {
c <- getWindowText(w.hwnd)
},
resp: c,
}
}
func (w *window) SetTitle(title string) *Request {
c := make(chan interface{})
return &Request{
op: func() {
C.setWindowText(w.hwnd, toUTF16(title))
c <- struct{}{}
},
resp: c,
}
}
func (w *window) Show() *Request {
c := make(chan interface{})
return &Request{
op: func() {
if !w.shownbefore {
C.ShowWindow(w.hwnd, C.nCmdShow)
C.updateWindow(w.hwnd)
w.shownbefore = true
} else {
C.ShowWindow(w.hwnd, C.SW_SHOW)
}
c <- struct{}{}
},
resp: c,
}
}
func (w *window) Hide() *Request {
c := make(chan interface{})
return &Request{
op: func() {
C.ShowWindow(w.hwnd, C.SW_HIDE)
c <- struct{}{}
},
resp: c,
}
}
func (w *window) Close() *Request {
c := make(chan interface{})
return &Request{
op: func() {
C.windowClose(w.hwnd)
c <- struct{}{}
},
resp: c,
}
}
func (w *window) OnClosing(e func(Doer) bool) *Request {
c := make(chan interface{})
return &Request{
op: func() {
w.closing.setbool(e)
c <- struct{}{}
},
resp: c,
}
}
//export storeWindowHWND
func storeWindowHWND(data unsafe.Pointer, hwnd C.HWND) {
w := (*window)(data)
w.hwnd = hwnd
}
//export windowResize
func windowResize(data unsafe.Pointer, r *C.RECT) {
w := (*window)(data)
w.doresize(int(r.right - r.left), int(r.bottom - r.top))
}
//export windowClosing
func windowClosing(data unsafe.Pointer) {
w := (*window)(data)
close := w.closing.fire()
if close {
C.windowClose(w.hwnd)
}
}
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