80 lines
1.8 KiB
Go
80 lines
1.8 KiB
Go
// 11 february 2014
|
|
|
|
package ui
|
|
|
|
const eventbufsiz = 100 // suggested by skelterjohn
|
|
|
|
// newEvent returns a new channel suitable for listening for events.
|
|
func newEvent() chan struct{} {
|
|
return make(chan struct{}, eventbufsiz)
|
|
}
|
|
|
|
// The sysData type contains all system data. It provides the system-specific underlying implementation. It is guaranteed to have the following by embedding:
|
|
type cSysData struct {
|
|
ctype int
|
|
event chan struct{}
|
|
allocate func(x int, y int, width int, height int, d *sysSizeData) []*allocation
|
|
spaced bool
|
|
alternate bool // editable for Combobox, multi-select for listbox, password for lineedit
|
|
handler AreaHandler // for Areas
|
|
}
|
|
|
|
// this interface is used to make sure all sysDatas are synced
|
|
var _xSysData interface {
|
|
sysDataSizingFunctions
|
|
make(window *sysData) error
|
|
firstShow() error
|
|
show()
|
|
hide()
|
|
setText(text string)
|
|
setRect(x int, y int, width int, height int, winheight int) error
|
|
isChecked() bool
|
|
text() string
|
|
append(string)
|
|
insertBefore(string, int)
|
|
selectedIndex() int
|
|
selectedIndices() []int
|
|
selectedTexts() []string
|
|
setWindowSize(int, int) error
|
|
setProgress(int)
|
|
len() int
|
|
setAreaSize(int, int)
|
|
repaintAll()
|
|
center()
|
|
} = &sysData{} // this line will error if there's an inconsistency
|
|
|
|
// signal sends the event signal. This raise is done asynchronously to avoid deadlocking the UI task.
|
|
// Thanks skelterjohn for this techinque: if we can't queue any more events, drop them
|
|
func (s *cSysData) signal() {
|
|
if s.event != nil {
|
|
go func() {
|
|
select {
|
|
case s.event <- struct{}{}:
|
|
default:
|
|
}
|
|
}()
|
|
}
|
|
}
|
|
|
|
const (
|
|
c_window = iota
|
|
c_button
|
|
c_checkbox
|
|
c_combobox
|
|
c_lineedit
|
|
c_label
|
|
c_listbox
|
|
c_progressbar
|
|
c_area
|
|
nctypes
|
|
)
|
|
|
|
func mksysdata(ctype int) *sysData {
|
|
s := &sysData{
|
|
cSysData: cSysData{
|
|
ctype: ctype,
|
|
},
|
|
}
|
|
return s
|
|
}
|