// 11 february 2014
package ui
import (
"fmt"
"sync"
"syscall"
"unsafe"
)
type sysData struct {
cSysData
hwnd _HWND
children map[_HMENU]*sysData
nextChildID _HMENU
childrenLock sync.Mutex
isMarquee bool // for sysData.setProgress()
// unlike with GTK+ and Mac OS X, we're responsible for sizing Area properly ourselves
areawidth int
areaheight int
clickCounter clickCounter
lastfocus _HWND
}
type classData struct {
name *uint16
style uint32
xstyle uint32
altStyle uint32
storeSysData bool
doNotLoadFont bool
appendMsg uintptr
insertBeforeMsg uintptr
deleteMsg uintptr
selectedIndexMsg uintptr
selectedIndexErr uintptr
addSpaceErr uintptr
lenMsg uintptr
}
const controlstyle = _WS_CHILD | _WS_VISIBLE | _WS_TABSTOP
const controlxstyle = 0
var classTypes = [nctypes]*classData{
c_window: &classData{
name: stdWndClass,
style: _WS_OVERLAPPEDWINDOW,
xstyle: 0,
storeSysData: true,
doNotLoadFont: true,
},
c_button: &classData{
name: toUTF16("BUTTON"),
style: _BS_PUSHBUTTON | controlstyle,
xstyle: 0 | controlxstyle,
},
c_checkbox: &classData{
name: toUTF16("BUTTON"),
// don't use BS_AUTOCHECKBOX because http://blogs.msdn.com/b/oldnewthing/archive/2014/05/22/10527522.aspx
style: _BS_CHECKBOX | controlstyle,
xstyle: 0 | controlxstyle,
},
c_combobox: &classData{
name: toUTF16("COMBOBOX"),
style: _CBS_DROPDOWNLIST | _WS_VSCROLL | controlstyle,
xstyle: 0 | controlxstyle,
altStyle: _CBS_DROPDOWN | _CBS_AUTOHSCROLL | _WS_VSCROLL | controlstyle,
appendMsg: _CB_ADDSTRING,
insertBeforeMsg: _CB_INSERTSTRING,
deleteMsg: _CB_DELETESTRING,
selectedIndexMsg: _CB_GETCURSEL,
selectedIndexErr: negConst(_CB_ERR),
addSpaceErr: negConst(_CB_ERRSPACE),
lenMsg: _CB_GETCOUNT,
},
c_lineedit: &classData{
name: toUTF16("EDIT"),
// WS_EX_CLIENTEDGE without WS_BORDER will apply visual styles
// thanks to MindChild in irc.efnet.net/#winprog
style: _ES_AUTOHSCROLL | controlstyle,
xstyle: _WS_EX_CLIENTEDGE | controlxstyle,
altStyle: _ES_PASSWORD | _ES_AUTOHSCROLL | controlstyle,
},
c_label: &classData{
name: toUTF16("STATIC"),
// SS_NOPREFIX avoids accelerator translation; SS_LEFTNOWORDWRAP clips text past the end
// controls are vertically aligned to the top by default (thanks Xeek in irc.freenode.net/#winapi)
// also note that tab stops are remove dfor labels
style: (_SS_NOPREFIX | _SS_LEFTNOWORDWRAP | controlstyle) &^ _WS_TABSTOP,
xstyle: 0 | controlxstyle,
// MAKE SURE THIS IS THE SAME
altStyle: (_SS_NOPREFIX | _SS_LEFTNOWORDWRAP | controlstyle) &^ _WS_TABSTOP,
},
c_listbox: &classData{
name: toUTF16("LISTBOX"),
// we don't use LBS_STANDARD because it sorts (and has WS_BORDER; see above)
// LBS_NOINTEGRALHEIGHT gives us exactly the size we want
// LBS_MULTISEL sounds like it does what we want but it actually doesn't; instead, it toggles item selection regardless of modifier state, which doesn't work like anything else (see http://msdn.microsoft.com/en-us/library/windows/desktop/bb775149%28v=vs.85%29.aspx and http://msdn.microsoft.com/en-us/library/windows/desktop/aa511485.aspx)
style: _LBS_NOTIFY | _LBS_NOINTEGRALHEIGHT | _WS_VSCROLL | controlstyle,
xstyle: _WS_EX_CLIENTEDGE | controlxstyle,
altStyle: _LBS_EXTENDEDSEL | _LBS_NOTIFY | _LBS_NOINTEGRALHEIGHT | _WS_VSCROLL | controlstyle,
appendMsg: _LB_ADDSTRING,
insertBeforeMsg: _LB_INSERTSTRING,
deleteMsg: _LB_DELETESTRING,
selectedIndexMsg: _LB_GETCURSEL,
selectedIndexErr: negConst(_LB_ERR),
addSpaceErr: negConst(_LB_ERRSPACE),
lenMsg: _LB_GETCOUNT,
},
c_progressbar: &classData{
name: toUTF16(x_PROGRESS_CLASS),
// note that tab stops are disabled for progress bars
style: (_PBS_SMOOTH | controlstyle) &^ _WS_TABSTOP,
xstyle: 0 | controlxstyle,
doNotLoadFont: true,
},
c_area: &classData{
name: areaWndClass,
style: areastyle,
xstyle: areaxstyle,
storeSysData: true,
doNotLoadFont: true,
},
}
func (s *sysData) addChild(child *sysData) _HMENU {
s.childrenLock.Lock()
defer s.childrenLock.Unlock()
s.nextChildID++ // start at 1
if s.children == nil {
s.children = map[_HMENU]*sysData{}
}
s.children[s.nextChildID] = child
return s.nextChildID
}
func (s *sysData) delChild(id _HMENU) {
s.childrenLock.Lock()
defer s.childrenLock.Unlock()
delete(s.children, id)
}
var (
_blankString = toUTF16("")
blankString = utf16ToArg(_blankString)
)
func (s *sysData) make(window *sysData) (err error) {
ct := classTypes[s.ctype]
cid := _HMENU(0)
pwin := uintptr(_NULL)
if window != nil { // this is a child control
cid = window.addChild(s)
pwin = uintptr(window.hwnd)
}
style := uintptr(ct.style)
if s.alternate {
style = uintptr(ct.altStyle)
}
lpParam := uintptr(_NULL)
if ct.storeSysData {
lpParam = uintptr(unsafe.Pointer(s))
}
r1, _, err := _createWindowEx.Call(
uintptr(ct.xstyle),
utf16ToArg(ct.name),
blankString, // we set the window text later
style,
negConst(_CW_USEDEFAULT),
negConst(_CW_USEDEFAULT),
negConst(_CW_USEDEFAULT),
negConst(_CW_USEDEFAULT),
pwin,
uintptr(cid),
uintptr(hInstance),
lpParam)
if r1 == 0 { // failure
if window != nil {
window.delChild(cid)
}
panic(fmt.Errorf("error actually creating window/control: %v", err))
}
if !ct.storeSysData { // regular control; store s.hwnd ourselves
s.hwnd = _HWND(r1)
} else if s.hwnd != _HWND(r1) { // we store sysData in storeSysData(); sanity check
panic(fmt.Errorf("hwnd mismatch creating window/control: storeSysData() stored 0x%X but CreateWindowEx() returned 0x%X", s.hwnd, r1))
}
if !ct.doNotLoadFont {
_sendMessage.Call(
uintptr(s.hwnd),
uintptr(_WM_SETFONT),
uintptr(_WPARAM(controlFont)),
uintptr(_LPARAM(_TRUE)))
}
return nil
}
var (
_updateWindow = user32.NewProc("UpdateWindow")
)
// if the object is a window, we need to do the following the first time
// ShowWindow(hwnd, nCmdShow);
// UpdateWindow(hwnd);
func (s *sysData) firstShow() error {
_showWindow.Call(
uintptr(s.hwnd),
uintptr(nCmdShow))
r1, _, err := _updateWindow.Call(uintptr(s.hwnd))
if r1 == 0 { // failure
panic(fmt.Errorf("error updating window for the first time: %v", err))
}
return nil
}
func (s *sysData) show() {
_showWindow.Call(
uintptr(s.hwnd),
uintptr(_SW_SHOW))
}
func (s *sysData) hide() {
_showWindow.Call(
uintptr(s.hwnd),
uintptr(_SW_HIDE))
}
func (s *sysData) setText(text string) {
ptext := toUTF16(text)
r1, _, err := _setWindowText.Call(
uintptr(s.hwnd),
utf16ToArg(ptext))
if r1 == 0 { // failure
panic(fmt.Errorf("error setting window/control text: %v", err))
}
}
func (s *sysData) setRect(x int, y int, width int, height int, winheight int) error {
r1, _, err := _moveWindow.Call(
uintptr(s.hwnd),
uintptr(x),
uintptr(y),
uintptr(width),
uintptr(height),
uintptr(_TRUE))
if r1 == 0 { // failure
return fmt.Errorf("error setting window/control rect: %v", err)
}
return nil
}
func (s *sysData) isChecked() bool {
r1, _, _ := _sendMessage.Call(
uintptr(s.hwnd),
uintptr(_BM_GETCHECK),
uintptr(0),
uintptr(0))
return r1 == _BST_CHECKED
}
func (s *sysData) text() (str string) {
var tc []uint16
r1, _, _ := _sendMessage.Call(
uintptr(s.hwnd),
uintptr(_WM_GETTEXTLENGTH),
uintptr(0),
uintptr(0))
length := r1 + 1 // terminating null
tc = make([]uint16, length)
_sendMessage.Call(
uintptr(s.hwnd),
uintptr(_WM_GETTEXT),
uintptr(_WPARAM(length)),
uintptr(_LPARAM(unsafe.Pointer(&tc[0]))))
return syscall.UTF16ToString(tc)
}
func (s *sysData) append(what string) {
pwhat := toUTF16(what)
r1, _, err := _sendMessage.Call(
uintptr(s.hwnd),
uintptr(classTypes[s.ctype].appendMsg),
uintptr(_WPARAM(0)),
utf16ToLPARAM(pwhat))
if r1 == uintptr(classTypes[s.ctype].addSpaceErr) {
panic(fmt.Errorf("out of space adding item to combobox/listbox (last error: %v)", err))
} else if r1 == uintptr(classTypes[s.ctype].selectedIndexErr) {
panic(fmt.Errorf("failed to add item to combobox/listbox (last error: %v)", err))
}
}
func (s *sysData) insertBefore(what string, index int) {
pwhat := toUTF16(what)
r1, _, err := _sendMessage.Call(
uintptr(s.hwnd),
uintptr(classTypes[s.ctype].insertBeforeMsg),
uintptr(_WPARAM(index)),
utf16ToLPARAM(pwhat))
if r1 == uintptr(classTypes[s.ctype].addSpaceErr) {
panic(fmt.Errorf("out of space adding item to combobox/listbox (last error: %v)", err))
} else if r1 == uintptr(classTypes[s.ctype].selectedIndexErr) {
panic(fmt.Errorf("failed to add item to combobox/listbox (last error: %v)", err))
}
}
func (s *sysData) selectedIndex() int {
r1, _, _ := _sendMessage.Call(
uintptr(s.hwnd),
uintptr(classTypes[s.ctype].selectedIndexMsg),
uintptr(_WPARAM(0)),
uintptr(_LPARAM(0)))
if r1 == uintptr(classTypes[s.ctype].selectedIndexErr) { // no selection or manually entered text (apparently, for the latter)
return -1
}
return int(r1)
}
func (s *sysData) selectedIndices() []int {
if !s.alternate { // single-selection list box; use single-selection method
index := s.selectedIndex()
if index == -1 {
return nil
}
return []int{index}
}
r1, _, err := _sendMessage.Call(
uintptr(s.hwnd),
uintptr(_LB_GETSELCOUNT),
uintptr(0),
uintptr(0))
if r1 == negConst(_LB_ERR) {
panic(fmt.Errorf("error: LB_ERR from LB_GETSELCOUNT in what we know is a multi-selection listbox: %v", err))
}
if r1 == 0 { // nothing selected
return nil
}
indices := make([]int, r1)
r1, _, err = _sendMessage.Call(
uintptr(s.hwnd),
uintptr(_LB_GETSELITEMS),
uintptr(_WPARAM(r1)),
uintptr(_LPARAM(unsafe.Pointer(&indices[0]))))
if r1 == negConst(_LB_ERR) {
panic(fmt.Errorf("error: LB_ERR from LB_GETSELITEMS in what we know is a multi-selection listbox: %v", err))
}
return indices
}
func (s *sysData) selectedTexts() []string {
indices := s.selectedIndices()
strings := make([]string, len(indices))
for i, v := range indices {
r1, _, err := _sendMessage.Call(
uintptr(s.hwnd),
uintptr(_LB_GETTEXTLEN),
uintptr(_WPARAM(v)),
uintptr(0))
if r1 == negConst(_LB_ERR) {
panic(fmt.Errorf("error: LB_ERR from LB_GETTEXTLEN in what we know is a valid listbox index (came from LB_GETSELITEMS): %v", err))
}
str := make([]uint16, r1)
r1, _, err = _sendMessage.Call(
uintptr(s.hwnd),
uintptr(_LB_GETTEXT),
uintptr(_WPARAM(v)),
uintptr(_LPARAM(unsafe.Pointer(&str[0]))))
if r1 == negConst(_LB_ERR) {
panic(fmt.Errorf("error: LB_ERR from LB_GETTEXT in what we know is a valid listbox index (came from LB_GETSELITEMS): %v", err))
}
strings[i] = syscall.UTF16ToString(str)
}
return strings
}
func (s *sysData) setWindowSize(width int, height int) error {
var rect _RECT
r1, _, err := _getClientRect.Call(
uintptr(s.hwnd),
uintptr(unsafe.Pointer(&rect)))
if r1 == 0 {
panic(fmt.Errorf("error getting upper-left of window for resize: %v", err))
}
// TODO AdjustWindowRect() on the result
// 0 because (0,0) is top-left so no winheight
err = s.setRect(int(rect.left), int(rect.top), width, height, 0)
if err != nil {
panic(fmt.Errorf("error actually resizing window: %v", err))
}
return nil
}
func (s *sysData) delete(index int) {
r1, _, err := _sendMessage.Call(
uintptr(s.hwnd),
uintptr(classTypes[s.ctype].deleteMsg),
uintptr(_WPARAM(index)),
uintptr(0))
if r1 == uintptr(classTypes[s.ctype].selectedIndexErr) {
panic(fmt.Errorf("failed to delete item from combobox/listbox (last error: %v)", err))
}
}
func (s *sysData) setIndeterminate() {
r1, _, err := _setWindowLongPtr.Call(
uintptr(s.hwnd),
negConst(_GWL_STYLE),
uintptr(classTypes[s.ctype].style | _PBS_MARQUEE))
if r1 == 0 {
panic(fmt.Errorf("error setting progress bar style to enter indeterminate mode: %v", err))
}
_sendMessage.Call(
uintptr(s.hwnd),
uintptr(_PBM_SETMARQUEE),
uintptr(_WPARAM(_TRUE)),
uintptr(0))
s.isMarquee = true
}
func (s *sysData) setProgress(percent int) {
if percent == -1 {
s.setIndeterminate()
return
}
if s.isMarquee {
// turn off marquee before switching back
_sendMessage.Call(
uintptr(s.hwnd),
uintptr(_PBM_SETMARQUEE),
uintptr(_WPARAM(_FALSE)),
uintptr(0))
r1, _, err := _setWindowLongPtr.Call(
uintptr(s.hwnd),
negConst(_GWL_STYLE),
uintptr(classTypes[s.ctype].style))
if r1 == 0 {
panic(fmt.Errorf("error setting progress bar style to leave indeterminate mode (percent %d): %v", percent, err))
}
s.isMarquee = false
}
send := func(msg uintptr, n int, l _LPARAM) {
_sendMessage.Call(
uintptr(s.hwnd),
msg,
uintptr(_WPARAM(n)),
uintptr(l))
}
// Windows 7 has a non-disableable slowly-animating progress bar increment
// there isn't one for decrement, so we'll work around by going one higher and then lower again
// for the case where percent == 100, we need to increase the range temporarily
// sources: http://social.msdn.microsoft.com/Forums/en-US/61350dc7-6584-4c4e-91b0-69d642c03dae/progressbar-disable-smooth-animation http://stackoverflow.com/questions/2217688/windows-7-aero-theme-progress-bar-bug http://discuss.joelonsoftware.com/default.asp?dotnet.12.600456.2 http://stackoverflow.com/questions/22469876/progressbar-lag-when-setting-position-with-pbm-setpos http://stackoverflow.com/questions/6128287/tprogressbar-never-fills-up-all-the-way-seems-to-be-updating-too-fast
if percent == 100 {
send(_PBM_SETRANGE32, 0, 101)
}
send(_PBM_SETPOS, percent+1, 0)
send(_PBM_SETPOS, percent, 0)
if percent == 100 {
send(_PBM_SETRANGE32, 0, 100)
}
}
func (s *sysData) len() int {
r1, _, err := _sendMessage.Call(
uintptr(s.hwnd),
uintptr(classTypes[s.ctype].lenMsg),
uintptr(_WPARAM(0)),
uintptr(_LPARAM(0)))
if r1 == uintptr(classTypes[s.ctype].selectedIndexErr) {
panic(fmt.Errorf("unexpected error return from sysData.len(); GetLastError() says %v", err))
}
return int(r1)
}
func (s *sysData) setAreaSize(width int, height int) {
_sendMessage.Call(
uintptr(s.hwnd),
uintptr(msgSetAreaSize),
uintptr(width), // WPARAM is UINT_PTR on Windows XP and newer at least, so we're good with this
uintptr(height))
}
func (s *sysData) repaintAll() {
_sendMessage.Call(
uintptr(s.hwnd),
uintptr(msgRepaintAll),
uintptr(0),
uintptr(0))
}
func (s *sysData) center() {
var ws _RECT
r1, _, err := _getWindowRect.Call(
uintptr(s.hwnd),
uintptr(unsafe.Pointer(&ws)))
if r1 == 0 {
panic(fmt.Errorf("error getting window rect for sysData.center(): %v", err))
}
// TODO should this be using the monitor functions instead? http://blogs.msdn.com/b/oldnewthing/archive/2005/05/05/414910.aspx
// error returns from GetSystemMetrics() is meaningless because the return value, 0, is still valid
// TODO should this be using the client rect and not the window rect?
dw, _, _ := _getSystemMetrics.Call(uintptr(_SM_CXFULLSCREEN))
dh, _, _ := _getSystemMetrics.Call(uintptr(_SM_CYFULLSCREEN))
ww := ws.right - ws.left
wh := ws.bottom - ws.top
wx := (int32(dw) / 2) - (ww / 2)
wy := (int32(dh) / 2) - (wh / 2)
s.setRect(int(wx), int(wy), int(ww), int(wh), 0)
}
func (s *sysData) setChecked(checked bool) {
c := uintptr(_BST_CHECKED)
if !checked {
c = uintptr(_BST_UNCHECKED)
}
_sendMessage.Call(
uintptr(s.hwnd),
uintptr(_BM_SETCHECK),
c,
uintptr(0))
}