golang walk界面库 最小化事件

示例图：

package mainimport (    "fmt"    "log"    "syscall"    "github.com/lxn/walk"    . "github.com/lxn/walk/declarative"    "github.com/lxn/win")var (    libuser32 *syscall.DLL    isIconic  *syscall.Proc)func init() {    // Library    libuser32 = syscall.MustLoadDLL("user32.dll")    // functions    isIconic = libuser32.MustFindProc("IsIconic")}/* 确定指定的窗口是否被最小化(图标)https://msdn.microsoft.com/en-us/library/windows/desktop/ms633527(v=vs.85).aspx*/func IsIconic(hWnd win.HWND) bool {    ret, _, _ := isIconic.Call(uintptr(hWnd))    return ret == win.TRUE}type MyWindow struct {    *walk.MainWindow}func main() {    mw := new(MyWindow)    if err := (MainWindow{        AssignTo: &mw.MainWindow,        Title:    "最小化测试",        MinSize:  Size{280, 200},        Layout:   HBox{},        Children: []Widget{            PushButton{                Text: "测试",                OnClicked: func() {                    walk.MsgBox(mw, "测试", "最小化事件捕捉!", walk.MsgBoxIconInformation)                },            },        },    }).Create(); err != nil {        log.Fatal(err)    }    mw.SizeChanged().Attach(func() {        if mw.X() == -32000 && mw.Y() == -32000 {            fmt.Printf("X, Y == -32000 --> 窗口最小化, X = %d, Y = %d\n", mw.X(), mw.Y())        }        if IsIconic(mw.Handle()) {            message := fmt.Sprintf("IsIconic --> 窗口最小化, X = %d, Y = %d", mw.X(), mw.Y())            walk.MsgBox(mw, "事件", message, walk.MsgBoxIconWarning)        }    })    mw.Run()}