121 lines
2.8 KiB
Go
121 lines
2.8 KiB
Go
// 14 february 2014
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package ui
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import (
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"sync"
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)
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// A Listbox is a vertical list of items, of which one or (optionally) more items can be selected at any given time.
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type Listbox struct {
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// TODO Select event
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lock sync.Mutex
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created bool
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sysData *sysData
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initItems []string
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}
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// NewCombobox makes a new combobox with the given items. If multiple is true, the listbox allows multiple selection.
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func NewListbox(multiple bool, items ...string) (l *Listbox) {
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l = &Listbox{
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sysData: mksysdata(c_listbox),
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initItems: items,
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}
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l.sysData.alternate = multiple
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return l
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}
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// Append adds an item to the end of the Listbox's list.
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func (l *Listbox) Append(what string) (err error) {
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l.lock.Lock()
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defer l.lock.Unlock()
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if l.created {
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return l.sysData.append(what)
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}
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l.initItems = append(l.initItems, what)
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return nil
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}
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// InsertBefore inserts a new item in the Listbox before the item at the given position.
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func (l *Listbox) InsertBefore(what string, before int) (err error) {
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l.lock.Lock()
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defer l.lock.Unlock()
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if l.created {
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return l.sysData.insertBefore(what, before)
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}
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m := make([]string, 0, len(l.initItems) + 1)
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m = append(m, l.initItems[:before]...)
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m = append(m, what)
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l.initItems = append(m, l.initItems[before:]...)
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return nil
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}
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// Delete removes the given item from the Listbox.
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func (l *Listbox) Delete(index int) error {
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l.lock.Lock()
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defer l.lock.Unlock()
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if l.created {
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return l.sysData.delete(index)
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}
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l.initItems = append(l.initItems[:index], l.initItems[index + 1:]...)
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return nil
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}
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// Selection returns a list of strings currently selected in the Listbox, or an empty list if none have been selected. This list will have at most one item on a single-selection Listbox.
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func (l *Listbox) Selection() []string {
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l.lock.Lock()
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defer l.lock.Unlock()
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if l.created {
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return l.sysData.selectedTexts()
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}
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return nil
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}
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// SelectedIndices returns a list of the currently selected indexes in the Listbox, or an empty list if none have been selected. This list will have at most one item on a single-selection Listbox.
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func (l *Listbox) SelectedIndices() []int {
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l.lock.Lock()
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defer l.lock.Unlock()
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if l.created {
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return l.sysData.selectedIndices()
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}
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return nil
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}
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func (l *Listbox) make(window *sysData) (err error) {
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l.lock.Lock()
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defer l.lock.Unlock()
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err = l.sysData.make("", window)
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if err != nil {
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return err
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}
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for _, s := range l.initItems {
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err = l.sysData.append(s)
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if err != nil {
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return err
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}
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}
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l.created = true
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return nil
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}
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func (l *Listbox) setRect(x int, y int, width int, height int) error {
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l.lock.Lock()
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defer l.lock.Unlock()
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return l.sysData.setRect(x, y, width, height)
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}
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func (l *Listbox) preferredSize() (width int, height int, err error) {
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l.lock.Lock()
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defer l.lock.Unlock()
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width, height = l.sysData.preferredSize()
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return
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}
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