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package dialog
import (
"fmt"
"reflect"
"syscall"
"unicode/utf16"
"unsafe"
"github.com/AllenDang/w32"
)
type WinDlgError int
func (e WinDlgError) Error() string {
return fmt.Sprintf("CommDlgExtendedError: %#x", e)
}
func err() error {
e := w32.CommDlgExtendedError()
if e == 0 {
return Cancelled
}
return WinDlgError(e)
}
func (b *MsgBuilder) yesNo() bool {
r := w32.MessageBox(w32.HWND(0), b.Msg, firstOf(b.Dlg.Title, "Confirm?"), w32.MB_YESNO)
return r == w32.IDYES
}
func (b *MsgBuilder) info() {
w32.MessageBox(w32.HWND(0), b.Msg, firstOf(b.Dlg.Title, "Information"), w32.MB_OK|w32.MB_ICONINFORMATION)
}
func (b *MsgBuilder) error() {
w32.MessageBox(w32.HWND(0), b.Msg, firstOf(b.Dlg.Title, "Error"), w32.MB_OK|w32.MB_ICONERROR)
}
type filedlg struct {
buf []uint16
filters []uint16
opf *w32.OPENFILENAME
}
func (d filedlg) Filename() string {
i := 0
for i < len(d.buf) && d.buf[i] != 0 {
i++
}
return string(utf16.Decode(d.buf[:i]))
}
func (b *FileBuilder) load() (string, error) {
d := openfile(w32.OFN_FILEMUSTEXIST, b)
if w32.GetOpenFileName(d.opf) {
return d.Filename(), nil
}
return "", err()
}
func (b *FileBuilder) save() (string, error) {
d := openfile(w32.OFN_OVERWRITEPROMPT, b)
if w32.GetSaveFileName(d.opf) {
return d.Filename(), nil
}
return "", err()
}
/* syscall.UTF16PtrFromString not sufficient because we need to encode embedded NUL bytes */
func utf16ptr(utf16 []uint16) *uint16 {
if utf16[len(utf16)-1] != 0 {
panic("refusing to make ptr to non-NUL terminated utf16 slice")
}
h := (*reflect.SliceHeader)(unsafe.Pointer(&utf16))
return (*uint16)(unsafe.Pointer(h.Data))
}
func utf16slice(ptr *uint16) []uint16 {
hdr := reflect.SliceHeader{Data: uintptr(unsafe.Pointer(ptr)), Len: 1, Cap: 1}
slice := *((*[]uint16)(unsafe.Pointer(&hdr)))
i := 0
for slice[len(slice)-1] != 0 {
i++
}
hdr.Len = i
slice = *((*[]uint16)(unsafe.Pointer(&hdr)))
return slice
}
func openfile(flags uint32, b *FileBuilder) (d filedlg) {
d.buf = make([]uint16, w32.MAX_PATH)
d.opf = &w32.OPENFILENAME{
File: utf16ptr(d.buf),
MaxFile: uint32(len(d.buf)),
Flags: flags,
}
d.opf.StructSize = uint32(unsafe.Sizeof(*d.opf))
if b.StartDir != "" {
d.opf.InitialDir, _ = syscall.UTF16PtrFromString(b.StartDir)
}
if b.Dlg.Title != "" {
d.opf.Title, _ = syscall.UTF16PtrFromString(b.Dlg.Title)
}
for _, filt := range b.Filters {
/* build utf16 string of form "Music File\0*.mp3;*.ogg;*.wav;\0" */
d.filters = append(d.filters, utf16.Encode([]rune(filt.Desc))...)
d.filters = append(d.filters, 0)
for _, ext := range filt.Extensions {
s := fmt.Sprintf("*.%s;", ext)
d.filters = append(d.filters, utf16.Encode([]rune(s))...)
}
d.filters = append(d.filters, 0)
}
if d.filters != nil {
d.filters = append(d.filters, 0, 0) // two extra NUL chars to terminate the list
d.opf.Filter = utf16ptr(d.filters)
}
return d
}
type dirdlg struct {
bi *w32.BROWSEINFO
}
func selectdir(b *DirectoryBuilder) (d dirdlg) {
d.bi = &w32.BROWSEINFO{Flags: w32.BIF_RETURNONLYFSDIRS}
if b.Dlg.Title != "" {
d.bi.Title, _ = syscall.UTF16PtrFromString(b.Dlg.Title)
}
return d
}
func (b *DirectoryBuilder) browse() (string, error) {
d := selectdir(b)
res := w32.SHBrowseForFolder(d.bi)
if res == 0 {
return "", Cancelled
}
return w32.SHGetPathFromIDList(res), nil
}
|
