objects/dropdown.go

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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"
var _ tomo.Object = new(Dropdown)
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// Dropdown is a non-editable text input that allows the user to pick a value
// from a list.
type Dropdown struct {
box tomo.ContainerBox
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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 {
box: tomo.NewContainerBox(),
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label: NewLabel(""),
}
dropdown.box.SetRole(tomo.R("objects", "Dropdown"))
dropdown.box.SetAttr(tomo.ALayout(layouts.Row { true, false }))
dropdown.box.Add(dropdown.label)
dropdown.box.Add(NewIcon(tomo.IconListChoose, tomo.IconSizeSmall))
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dropdown.SetItems(items...)
if len(items) > 0 {
dropdown.SetValue(items[0])
}
dropdown.box.SetInputMask(true)
dropdown.box.OnButtonDown(dropdown.handleButtonDown)
dropdown.box.OnButtonUp(dropdown.handleButtonUp)
dropdown.box.OnKeyDown(dropdown.handleKeyDown)
dropdown.box.OnKeyUp(dropdown.handleKeyUp)
dropdown.box.SetFocusable(true)
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return dropdown
}
// GetBox returns the underlying box.
func (this *Dropdown) GetBox () tomo.Box {
return this.box
}
// SetFocused sets whether or not this dropdown has keyboard focus. If set to
// true, this method will steal focus away from whichever object currently has
// focus.
func (this *Dropdown) SetFocused (focused bool) {
this.box.SetFocused(focused)
}
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// 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)
}
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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()
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return true
}
func (this *Dropdown) handleKeyUp (key input.Key, numberPad bool) bool {
if !isClickingKey(key) { return false }
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return true
}
func (this *Dropdown) handleButtonDown (button input.Button) bool {
if !isClickingButton(button) { return false }
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return true
}
func (this *Dropdown) handleButtonUp (button input.Button) bool {
if !isClickingButton(button) { return false }
if this.box.Window().MousePosition().In(this.box.Bounds()) {
this.Choose()
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}
return true
}