103 lines
2.9 KiB
Go
103 lines
2.9 KiB
Go
// 11 february 2014
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package ui
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import (
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"runtime"
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)
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const eventbufsiz = 100 // suggested by skelterjohn
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// Event returns a new channel suitable for listening for events.
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func Event() chan struct{} {
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return make(chan struct{}, eventbufsiz)
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}
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// The sysData type contains all system data. It provides the system-specific underlying implementation. It is guaranteed to have the following by embedding:
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type cSysData struct {
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ctype int
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event chan struct{}
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resize func(x int, y int, width int, height int, winheight int) error
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alternate bool // editable for Combobox, multi-select for listbox, password for lineedit
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}
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func (c *cSysData) make(initText string, window *sysData) error {
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panic(runtime.GOOS + " sysData does not define make()")
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}
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func (c *cSysData) show() error {
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panic(runtime.GOOS + " sysData does not define show()")
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}
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func (c *cSysData) hide() error {
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panic(runtime.GOOS + " sysData does not define hide()")
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}
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func (c *cSysData) setText(text string) error {
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panic(runtime.GOOS + " sysData does not define setText()")
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}
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func (c *cSysData) setRect(x int, y int, width int, height int, winheight int) error {
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panic(runtime.GOOS + " sysData does not define setRect()")
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}
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func (c *cSysData) isChecked() bool {
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panic(runtime.GOOS + " sysData does not define isChecked()")
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}
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func (c *cSysData) text() string {
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panic(runtime.GOOS + " sysData does not define text()")
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}
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func (c *cSysData) append(string) error {
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panic(runtime.GOOS + " sysData does not define append()")
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}
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func (c *cSysData) insertBefore(string, int) error {
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panic(runtime.GOOS + " sysData does not define insertBefore()")
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}
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func (c *cSysData) selectedIndex() int {
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panic(runtime.GOOS + " sysData does not define selectedIndex()")
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}
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func (c *cSysData) selectedIndices() []int {
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panic(runtime.GOOS + " sysData does not define selectedIndices()")
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}
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func (c *cSysData) selectedTexts() []string {
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panic(runtime.GOOS + " sysData does not define selectedIndex()")
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}
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func (c *cSysData) setWindowSize(int, int) error {
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panic(runtime.GOOS + " sysData does not define setWindowSize()")
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}
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func (c *cSysData) delete(int) error {
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panic(runtime.GOOS + " sysData does not define delete()")
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}
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func (c *cSysData) preferredSize() (int, int) {
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panic(runtime.GOOS + " sysData does not define preferredSize()")
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}
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func (c *cSysData) setProgress(int) {
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panic(runtime.GOOS + " sysData does not define setProgress()")
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}
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// signal sends the event signal. This raise is done asynchronously to avoid deadlocking the UI task.
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// Thanks skelterjohn for this techinque: if we can't queue any more events, drop them
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func (s *cSysData) signal() {
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if s.event != nil {
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go func() {
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select {
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case s.event <- struct{}{}:
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default:
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}
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}()
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}
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}
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const (
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c_window = iota
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c_button
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c_checkbox
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c_combobox
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c_lineedit
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c_label
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c_listbox
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c_progressbar
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nctypes
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)
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func mksysdata(ctype int) *sysData {
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return &sysData{
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cSysData: cSysData{
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ctype: ctype,
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},
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}
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}
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