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// 14 february 2014
package ui
import (
"fmt"
"sync"
)
// A Combobox is a drop-down list of items, of which at most one can be selected at any given time. You may optionally make the combobox editable to allow custom items. Initially, no item will be selected (and no text entered in an editable Combobox's entry field).
type Combobox struct {
// TODO Select event
lock sync.Mutex
created bool
sysData *sysData
initItems []string
}
func newCombobox(editable bool, items ...string) (c *Combobox) {
c = &Combobox{
sysData: mksysdata(c_combobox),
initItems: items,
}
c.sysData.alternate = editable
return c
}
// NewCombobox makes a new Combobox with the given items.
func NewCombobox(items ...string) *Combobox {
return newCombobox(false, items...)
}
// NewEditableCombobox makes a new editable Combobox with the given items.
func NewEditableCombobox(items ...string) *Combobox {
return newCombobox(true, items...)
}
// Append adds items to the end of the Combobox's list.
func (c *Combobox) Append(what ...string) (err error) {
c.lock.Lock()
defer c.lock.Unlock()
if c.created {
for i, s := range what {
err := c.sysData.append(s)
if err != nil {
return fmt.Errorf("error adding element %d in Combobox.Append() (%q): %v", i, s, err)
}
}
return nil
}
c.initItems = append(c.initItems, what...)
return nil
}
// InsertBefore inserts a new item in the Combobox before the item at the given position. (TODO action if before is out of bounds)
func (c *Combobox) InsertBefore(what string, before int) (err error) {
c.lock.Lock()
defer c.lock.Unlock()
if c.created {
return c.sysData.insertBefore(what, before)
}
m := make([]string, 0, len(c.initItems) + 1)
m = append(m, c.initItems[:before]...)
m = append(m, what)
c.initItems = append(m, c.initItems[before:]...)
return nil
}
// Delete removes the given item from the Combobox. (TODO action if index is out of bounds)
func (c *Combobox) Delete(index int) error {
c.lock.Lock()
defer c.lock.Unlock()
if c.created {
return c.sysData.delete(index)
}
c.initItems = append(c.initItems[:index], c.initItems[index + 1:]...)
return nil
}
// Selection returns the current selection.
func (c *Combobox) Selection() string {
c.lock.Lock()
defer c.lock.Unlock()
if c.created {
return c.sysData.text()
}
return ""
}
// SelectedIndex returns the index of the current selection in the Combobox. It returns -1 either if no selection was made or if text was manually entered in an editable Combobox.
func (c *Combobox) SelectedIndex() int {
c.lock.Lock()
defer c.lock.Unlock()
if c.created {
return c.sysData.selectedIndex()
}
return -1
}
func (c *Combobox) make(window *sysData) (err error) {
c.lock.Lock()
defer c.lock.Unlock()
err = c.sysData.make("", window)
if err != nil {
return err
}
for _, s := range c.initItems {
err = c.sysData.append(s)
if err != nil {
return err
}
}
c.created = true
return nil
}
func (c *Combobox) setRect(x int, y int, width int, height int, winheight int) error {
c.lock.Lock()
defer c.lock.Unlock()
return c.sysData.setRect(x, y, width, height, winheight)
}
func (c *Combobox) preferredSize() (width int, height int, err error) {
c.lock.Lock()
defer c.lock.Unlock()
width, height = c.sysData.preferredSize()
return
}
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