objects/dropdown.go

117 lines
2.9 KiB
Go

package objects
// import "image"
import "git.tebibyte.media/tomo/tomo"
import "git.tebibyte.media/tomo/tomo/input"
import "git.tebibyte.media/tomo/tomo/event"
import "git.tebibyte.media/tomo/objects/layouts"
// Dropdown is a non-editable text input that allows the user to pick a value
// from a list.
type Dropdown struct {
tomo.ContainerBox
label *Label
value string
items []string
menu *Menu
on struct {
valueChange event.FuncBroadcaster
}
}
// NewDropdown creates a new dropdown input with the specified items
func NewDropdown (items ...string) *Dropdown {
dropdown := &Dropdown {
ContainerBox: tomo.NewContainerBox(),
label: NewLabel(""),
}
dropdown.SetRole(tomo.R("objects", "Dropdown"))
dropdown.SetAttr(tomo.ALayout(layouts.Row { true, false }))
dropdown.Add(dropdown.label)
// TODO: replace IconValueDecrement with a drop-down expand icon once
// we get that
dropdown.Add(NewIcon(tomo.IconValueDecrement, tomo.IconSizeSmall))
dropdown.SetItems(items...)
if len(items) > 0 {
dropdown.SetValue(items[0])
}
dropdown.SetInputMask(true)
dropdown.OnButtonDown(dropdown.handleButtonDown)
dropdown.OnButtonUp(dropdown.handleButtonUp)
dropdown.OnKeyDown(dropdown.handleKeyDown)
dropdown.OnKeyUp(dropdown.handleKeyUp)
dropdown.SetFocusable(true)
return dropdown
}
// Value returns the value of the dropdown. This does not necissarily have to be
// in the list of items.
func (this *Dropdown) Value () string {
return this.value
}
// SetValue sets the value of the dropdown. This does not necissarily have to be
// in the list of items.
func (this *Dropdown) SetValue (value string) {
this.value = value
this.label.SetText(value)
}
// SetItems sets the items from which the user is able to pick.
func (this *Dropdown) SetItems (items ...string) {
this.items = items
}
// Choose creates a menu that allows the user to pick a value.
func (this *Dropdown) Choose () {
if this.menu != nil {
this.menu.Close()
}
menu, err := NewAnchoredMenu(this, this.itemList()...)
if err != nil { return }
this.menu = menu
menu.SetVisible(true)
}
func (this *Dropdown) itemList () []tomo.Object {
items := make([]tomo.Object, len(this.items))
for index, value := range this.items {
value := value
item := NewMenuItem(value)
item.OnClick(func () {
this.SetValue(value)
this.on.valueChange.Broadcast()
})
items[index] = item
}
return items
}
func (this *Dropdown) handleKeyDown (key input.Key, numberPad bool) bool {
if !isClickingKey(key) { return false }
this.Choose()
return true
}
func (this *Dropdown) handleKeyUp (key input.Key, numberPad bool) bool {
if !isClickingKey(key) { return false }
return true
}
func (this *Dropdown) handleButtonDown (button input.Button) bool {
if !isClickingButton(button) { return false }
return true
}
func (this *Dropdown) handleButtonUp (button input.Button) bool {
if !isClickingButton(button) { return false }
if this.Window().MousePosition().In(this.Bounds()) {
this.Choose()
}
return true
}