objects/textinput.go

137 lines
3.4 KiB
Go

package objects
import "image"
import "git.tebibyte.media/tomo/tomo"
import "git.tebibyte.media/tomo/tomo/text"
import "git.tebibyte.media/tomo/tomo/input"
import "git.tebibyte.media/tomo/tomo/event"
// TextInput is a single-line editable text box.
type TextInput struct {
tomo.TextBox
text []rune
on struct {
valueChange event.FuncBroadcaster
confirm event.FuncBroadcaster
}
}
// NewTextInput creates a new text input containing the specified text.
func NewTextInput (text string) *TextInput {
this := &TextInput { TextBox: tomo.NewTextBox() }
this.SetRole(tomo.R("objects", "TextInput"))
this.SetAttr(tomo.AAlign(tomo.AlignStart, tomo.AlignMiddle))
this.SetAttr(tomo.AOverflow(true, false))
this.SetText(text)
this.SetFocusable(true)
this.SetSelectable(true)
this.OnKeyDown(this.handleKeyDown)
this.OnKeyUp(this.handleKeyUp)
this.OnScroll(this.handleScroll)
return this
}
// SetValue sets the text content of the input.
func (this *TextInput) SetValue (text string) {
this.text = []rune(text)
this.TextBox.SetText(text)
}
// Value returns the text content of the input.
func (this *TextInput) Value () string {
return string(this.text)
}
// SetText sets the text content of the input.
func (this *TextInput) SetText (text string) {
this.SetValue(text)
}
// Text returns the text content of the input.
func (this *TextInput) Text () string {
return this.Value()
}
// OnConfirm specifies a function to be called when the user presses enter
// within the text input.
func (this *TextInput) OnConfirm (callback func ()) event.Cookie {
return this.on.confirm.Connect(callback)
}
// OnValueChange specifies a function to be called when the user edits the input
// text.
func (this *TextInput) OnValueChange (callback func ()) event.Cookie {
return this.on.valueChange.Connect(callback)
}
// Type types a character at the current dot position.
func (this *TextInput) Type (char rune) {
dot := this.Dot()
this.text, dot = text.Type(this.text, dot, rune(char))
this.Select(dot)
this.SetText(string(this.text))
}
func (this *TextInput) handleKeyDown (key input.Key, numpad bool) bool {
dot := this.Dot()
modifiers := this.Window().Modifiers()
word := modifiers.Control
changed := false
defer func () {
this.Select(dot)
if changed {
this.SetText(string(this.text))
this.on.valueChange.Broadcast()
}
} ()
switch {
case key == input.KeyEnter:
this.on.confirm.Broadcast()
return true
case key == input.KeyBackspace:
this.text, dot = text.Backspace(this.text, dot, word)
changed = true
return true
case key == input.KeyDelete:
this.text, dot = text.Delete(this.text, dot, word)
changed = true
return true
case key == input.Key('a') && modifiers.Control:
dot.Start = 0
dot.End = len(this.text)
return true
case key.Printable():
this.text, dot = text.Type(this.text, dot, rune(key))
changed = true
return true
default:
return false
}
}
func (this *TextInput) handleKeyUp (key input.Key, numpad bool) bool {
modifiers := this.Window().Modifiers()
switch {
case key == input.KeyEnter:
return true
case key == input.KeyBackspace:
return true
case key == input.KeyDelete:
return true
case key == input.Key('a') && modifiers.Control:
return true
case key.Printable():
return true
default:
return false
}
}
func (this *TextInput) handleScroll (x, y float64) bool {
if x == 0 { return false }
this.ScrollTo(this.ContentBounds().Min.Sub(image.Pt(int(x), int(y))))
return true
}