470 lines
10 KiB
Go
470 lines
10 KiB
Go
// 11 february 2014
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package main
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import (
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"fmt"
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"syscall"
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"unsafe"
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"sync"
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)
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type sysData struct {
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cSysData
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hwnd _HWND
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children map[_HMENU]*sysData
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nextChildID _HMENU
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childrenLock sync.Mutex
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shownAlready bool
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}
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type classData struct {
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name string
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style uint32
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xstyle uint32
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mkid bool
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altStyle uint32
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appendMsg uintptr
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insertBeforeMsg uintptr
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deleteMsg uintptr
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selectedIndexMsg uintptr
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selectedIndexErr int
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addSpaceErr int
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}
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const controlstyle = _WS_CHILD | _WS_VISIBLE | _WS_TABSTOP
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const controlxstyle = 0
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var classTypes = [nctypes]*classData{
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c_window: &classData{
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style: _WS_OVERLAPPEDWINDOW,
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xstyle: 0,
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},
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c_button: &classData{
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name: "BUTTON",
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style: _BS_PUSHBUTTON | controlstyle,
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xstyle: 0 | controlxstyle,
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},
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c_checkbox: &classData{
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name: "BUTTON",
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style: _BS_AUTOCHECKBOX | controlstyle,
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xstyle: 0 | controlxstyle,
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},
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c_combobox: &classData{
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name: "COMBOBOX",
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style: _CBS_DROPDOWNLIST | controlstyle,
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xstyle: 0 | controlxstyle,
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altStyle: _CBS_DROPDOWN | _CBS_AUTOHSCROLL | controlstyle,
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appendMsg: _CB_ADDSTRING,
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insertBeforeMsg: _CB_INSERTSTRING,
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deleteMsg: _CB_DELETESTRING,
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selectedIndexMsg: _CB_GETCURSEL,
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selectedIndexErr: _CB_ERR,
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addSpaceErr: _CB_ERRSPACE,
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},
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c_lineedit: &classData{
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name: "EDIT",
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style: _ES_AUTOHSCROLL | _WS_BORDER | controlstyle,
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xstyle: 0 | controlxstyle,
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},
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c_label: &classData{
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name: "STATIC",
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style: _SS_NOPREFIX | controlstyle,
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xstyle: 0 | controlxstyle,
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},
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c_listbox: &classData{
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name: "LISTBOX",
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// TODO also _WS_HSCROLL?
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style: _WS_VSCROLL | controlstyle,
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xstyle: 0 | controlxstyle,
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altStyle: _LBS_EXTENDEDSEL | _WS_VSCROLL | controlstyle,
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appendMsg: _LB_ADDSTRING,
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insertBeforeMsg: _LB_INSERTSTRING,
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deleteMsg: _LB_DELETESTRING,
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selectedIndexMsg: _LB_GETCURSEL,
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selectedIndexErr: _LB_ERR,
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addSpaceErr: _LB_ERRSPACE,
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},
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}
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func (s *sysData) addChild(child *sysData) _HMENU {
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s.childrenLock.Lock()
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defer s.childrenLock.Unlock()
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s.nextChildID++ // start at 1
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if s.children == nil {
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s.children = map[_HMENU]*sysData{}
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}
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s.children[s.nextChildID] = child
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return s.nextChildID
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}
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func (s *sysData) delChild(id _HMENU) {
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s.childrenLock.Lock()
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defer s.childrenLock.Unlock()
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delete(s.children, id)
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}
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func (s *sysData) make(initText string, window *sysData) (err error) {
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ret := make(chan uiret)
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defer close(ret)
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ct := classTypes[s.ctype]
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classname := ct.name
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cid := _HMENU(0)
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pwin := uintptr(_NULL)
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if window != nil { // this is a child control
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cid = window.addChild(s)
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pwin = uintptr(window.hwnd)
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} else { // need a new class
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n, err := registerStdWndClass(s)
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if err != nil {
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return fmt.Errorf("error creating window class for new window: %v", err)
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}
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classname = n
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}
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style := uintptr(ct.style)
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if s.alternate {
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style = uintptr(ct.altStyle)
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}
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uitask <- &uimsg{
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call: _createWindowEx,
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p: []uintptr{
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uintptr(ct.xstyle),
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uintptr(unsafe.Pointer(syscall.StringToUTF16Ptr(classname))),
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uintptr(unsafe.Pointer(syscall.StringToUTF16Ptr(initText))),
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style,
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uintptr(_CW_USEDEFAULT),
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uintptr(_CW_USEDEFAULT),
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uintptr(_CW_USEDEFAULT),
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uintptr(_CW_USEDEFAULT),
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pwin,
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uintptr(cid),
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uintptr(hInstance),
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uintptr(_NULL),
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},
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ret: ret,
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}
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r := <-ret
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if r.ret == 0 { // failure
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if window != nil {
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window.delChild(cid)
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}
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return fmt.Errorf("error actually creating window/control: %v", r.err)
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}
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s.hwnd = _HWND(r.ret)
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return nil
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}
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var (
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_updateWindow = user32.NewProc("UpdateWindow")
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)
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// if the object is a window, we need to do the following the first time
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// ShowWindow(hwnd, nCmdShow);
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// UpdateWindow(hwnd);
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// otherwise we go ahead and show the object normally with SW_SHOW
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func (s *sysData) show() (err error) {
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if s.ctype != c_window { // don't do the init ShowWindow/UpdateWindow chain on non-windows
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s.shownAlready = true
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}
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show := uintptr(_SW_SHOW)
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if !s.shownAlready {
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show = uintptr(nCmdShow)
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}
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ret := make(chan uiret)
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defer close(ret)
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// TODO figure out how to handle error
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uitask <- &uimsg{
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call: _showWindow,
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p: []uintptr{uintptr(s.hwnd), show},
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ret: ret,
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}
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<-ret
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if !s.shownAlready {
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uitask <- &uimsg{
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call: _updateWindow,
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p: []uintptr{uintptr(s.hwnd)},
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ret: ret,
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}
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r := <-ret
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if r.ret == 0 { // failure
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return fmt.Errorf("error updating window for the first time: %v", r.err)
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}
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s.shownAlready = true
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}
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return nil
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}
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func (s *sysData) hide() (err error) {
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ret := make(chan uiret)
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defer close(ret)
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// TODO figure out how to handle error
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uitask <- &uimsg{
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call: _showWindow,
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p: []uintptr{uintptr(s.hwnd), _SW_HIDE},
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ret: ret,
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}
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<-ret
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return nil
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}
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func (s *sysData) setText(text string) error {
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ret := make(chan uiret)
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defer close(ret)
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uitask <- &uimsg{
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call: _setWindowText,
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p: []uintptr{
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uintptr(s.hwnd),
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uintptr(unsafe.Pointer(syscall.StringToUTF16Ptr(text))),
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},
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ret: ret,
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}
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r := <-ret
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if r.ret == 0 { // failure
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return r.err
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}
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return nil
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}
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func (s *sysData) setRect(x int, y int, width int, height int) error {
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ret := make(chan uiret)
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defer close(ret)
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uitask <- &uimsg{
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call: _moveWindow,
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p: []uintptr{
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uintptr(s.hwnd),
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uintptr(x),
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uintptr(y),
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uintptr(width),
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uintptr(height),
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uintptr(_TRUE),
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},
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ret: ret,
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}
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r := <-ret
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if r.ret == 0 { // failure
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return fmt.Errorf("error setting window/control rect: %v", r.err)
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}
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return nil
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}
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func (s *sysData) isChecked() bool {
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ret := make(chan uiret)
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defer close(ret)
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uitask <- &uimsg{
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call: _sendMessage,
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p: []uintptr{
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uintptr(s.hwnd),
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uintptr(_BM_GETCHECK),
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uintptr(0),
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uintptr(0),
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},
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ret: ret,
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}
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r := <-ret
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return r.ret == _BST_CHECKED
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}
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func (s *sysData) text() (str string) {
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var tc []uint16
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ret := make(chan uiret)
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defer close(ret)
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uitask <- &uimsg{
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call: _sendMessage,
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p: []uintptr{
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uintptr(s.hwnd),
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uintptr(_WM_GETTEXTLENGTH),
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uintptr(0),
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uintptr(0),
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},
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ret: ret,
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}
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r := <-ret
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length := r.ret + 1 // terminating null
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tc = make([]uint16, length)
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uitask <- &uimsg{
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call: _sendMessage,
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p: []uintptr{
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uintptr(s.hwnd),
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uintptr(_WM_GETTEXT),
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uintptr(_WPARAM(length)),
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uintptr(_LPARAM(unsafe.Pointer(&tc[0]))),
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},
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ret: ret,
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}
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<-ret
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return syscall.UTF16ToString(tc)
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}
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func (s *sysData) append(what string) (err error) {
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ret := make(chan uiret)
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defer close(ret)
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uitask <- &uimsg{
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call: _sendMessage,
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p: []uintptr{
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uintptr(s.hwnd),
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uintptr(classTypes[s.ctype].appendMsg),
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uintptr(_WPARAM(0)),
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uintptr(_LPARAM(unsafe.Pointer(syscall.StringToUTF16Ptr(what)))),
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},
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ret: ret,
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}
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r := <-ret
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if r.ret == uintptr(classTypes[s.ctype].addSpaceErr) {
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return fmt.Errorf("out of space adding item to combobox/listbox (last error: %v)", r.err)
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} else if r.ret == uintptr(classTypes[s.ctype].selectedIndexErr) {
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return fmt.Errorf("failed to add item to combobox/listbox (last error: %v)", r.err)
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}
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return nil
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}
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func (s *sysData) insertBefore(what string, index int) (err error) {
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ret := make(chan uiret)
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defer close(ret)
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uitask <- &uimsg{
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call: _sendMessage,
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p: []uintptr{
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uintptr(s.hwnd),
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uintptr(classTypes[s.ctype].insertBeforeMsg),
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uintptr(_WPARAM(index)),
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uintptr(_LPARAM(unsafe.Pointer(syscall.StringToUTF16Ptr(what)))),
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},
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ret: ret,
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}
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r := <-ret
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if r.ret == uintptr(classTypes[s.ctype].addSpaceErr) {
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return fmt.Errorf("out of space adding item to combobox/listbox (last error: %v)", r.err)
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} else if r.ret == uintptr(classTypes[s.ctype].selectedIndexErr) {
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return fmt.Errorf("failed to add item to combobox/listbox (last error: %v)", r.err)
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}
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return nil
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}
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// TODO differentiate between nothing selected and custom text entered for a Combobox
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func (s *sysData) selectedIndex() int {
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ret := make(chan uiret)
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defer close(ret)
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uitask <- &uimsg{
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call: _sendMessage,
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p: []uintptr{
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uintptr(s.hwnd),
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uintptr(classTypes[s.ctype].selectedIndexMsg),
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uintptr(_WPARAM(0)),
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uintptr(_LPARAM(0)),
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},
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ret: ret,
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}
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r := <-ret
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if r.ret == uintptr(classTypes[s.ctype].selectedIndexErr) { // no selection
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return -1
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}
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return int(r.ret)
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}
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func (s *sysData) selectedIndices() []int {
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if !s.alternate { // single-selection list box; use single-selection method
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index := s.selectedIndex()
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if index == -1 {
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return nil
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}
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return []int{index}
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}
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ret := make(chan uiret)
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defer close(ret)
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uitask <- &uimsg{
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call: _sendMessage,
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p: []uintptr{
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uintptr(s.hwnd),
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uintptr(_LB_GETSELCOUNT),
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uintptr(0),
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uintptr(0),
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},
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ret: ret,
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}
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r := <-ret
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if r.ret == uintptr(_LB_ERR) {
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panic("UI library internal error: LB_ERR from LB_GETSELCOUNT in what we know is a multi-selection listbox")
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}
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indices := make([]int, r.ret)
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uitask <- &uimsg{
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call: _sendMessage,
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p: []uintptr{
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uintptr(s.hwnd),
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uintptr(_LB_GETSELITEMS),
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uintptr(_WPARAM(r.ret)),
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uintptr(_LPARAM(unsafe.Pointer(&indices[0]))),
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},
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ret: ret,
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}
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r = <-ret
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if r.ret == uintptr(_LB_ERR) {
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panic("UI library internal error: LB_ERR from LB_GETSELITEMS in what we know is a multi-selection listbox")
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}
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return indices
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}
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func (s *sysData) selectedTexts() []string {
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indices := s.selectedIndices()
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ret := make(chan uiret)
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defer close(ret)
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strings := make([]string, len(indices))
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for i, v := range indices {
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uitask <- &uimsg{
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call: _sendMessage,
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p: []uintptr{
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uintptr(s.hwnd),
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uintptr(_LB_GETTEXTLEN),
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uintptr(_WPARAM(v)),
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uintptr(0),
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},
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ret: ret,
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}
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r := <-ret
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if r.ret == uintptr(_LB_ERR) {
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panic("UI library internal error: LB_ERR from LB_GETTEXTLEN in what we know is a valid listbox index (came from LB_GETSELITEMS")
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}
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str := make([]uint16, r.ret)
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uitask <- &uimsg{
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call: _sendMessage,
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p: []uintptr{
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uintptr(s.hwnd),
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uintptr(_LB_GETTEXT),
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uintptr(_WPARAM(v)),
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uintptr(_LPARAM(unsafe.Pointer(&str[0]))),
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},
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ret: ret,
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}
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<-ret
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if r.ret == uintptr(_LB_ERR) {
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panic("UI library internal error: LB_ERR from LB_GETTEXT in what we know is a valid listbox index (came from LB_GETSELITEMS")
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}
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strings[i] = syscall.UTF16ToString(str)
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}
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return strings
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}
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func (s *sysData) setWindowSize(width int, height int) error {
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var rect _RECT
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ret := make(chan uiret)
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defer close(ret)
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uitask <- &uimsg{
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call: _getClientRect,
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p: []uintptr{
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uintptr(s.hwnd),
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uintptr(unsafe.Pointer(&rect)),
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},
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ret: ret,
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}
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r := <-ret
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if r.ret == 0 {
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return fmt.Errorf("error getting upper-left of window for resize: %v", r.err)
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}
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err := s.setRect(int(rect.Left), int(rect.Top), width, height)
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if err != nil {
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return fmt.Errorf("error actually resizing window: %v", err)
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}
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return nil
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}
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