Renamed input.go to textinput.go

textinput.go

@@ -0,0 +1,110 @@
+package objects
+
+import "image"
+import "git.tebibyte.media/tomo/tomo"
+import "git.tebibyte.media/tomo/tomo/text"
+import "git.tebibyte.media/tomo/tomo/theme"
+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 {
+		enter event.FuncBroadcaster
+		edit  event.FuncBroadcaster
+	}
+}
+
+// NewTextInput creates a new text input containing the specified text.
+func NewTextInput (text string) *TextInput {
+	this := &TextInput { TextBox: tomo.NewTextBox() }
+	theme.Apply(this, theme.R("objects", "TextInput", ""))
+	this.SetAlign(tomo.AlignStart, tomo.AlignMiddle)
+	this.SetText(text)
+	this.SetFocusable(true)
+	this.SetSelectable(true)
+	this.SetOverflow(true, false)
+	this.OnKeyDown(this.handleKeyDown)
+	this.OnScroll(this.handleScroll)
+	return this
+}
+
+// SetText sets the text content of the input.
+func (this *TextInput) SetText (text string) {
+	this.text = []rune(text)
+	this.TextBox.SetText(text)
+}
+
+// Text returns the text content of the input.
+func (this *TextInput) Text () string {
+	return string(this.text)
+}
+
+// OnEnter specifies a function to be called when the user presses enter within
+// the text input.
+func (this *TextInput) OnEnter (callback func ()) event.Cookie {
+	return this.on.enter.Connect(callback)
+}
+
+// OnEdit specifies a function to be called when the user edits the input text.
+func (this *TextInput) OnEdit (callback func ()) event.Cookie {
+	return this.on.edit.Connect(callback)
+}
+
+func (this *TextInput) handleKeyDown (key input.Key, numpad bool) {
+	dot       := this.Dot()
+	modifiers := this.Modifiers()
+	word      := modifiers.Control
+	sel       := modifiers.Shift
+	changed   := false
+
+	// TODO all this (except editing stuff) really should be moved into the
+	// backend
+
+	switch {
+	case key == input.KeyEnter:
+		this.on.enter.Broadcast()
+	case key == input.KeyHome || (modifiers.Alt && key == input.KeyLeft):
+		dot.End = 0
+		if !sel { dot.Start = dot.End }
+	case key == input.KeyEnd || (modifiers.Alt && key == input.KeyRight):
+		dot.End = len(this.text)
+		if !sel { dot.Start = dot.End }
+	case key == input.KeyLeft:
+		if sel {
+			dot = text.SelectLeft(this.text, dot, word)
+		} else {
+			dot = text.MoveLeft(this.text, dot, word)
+		}
+	case key == input.KeyRight:
+		if sel {
+			dot = text.SelectRight(this.text, dot, word)
+		} else {
+			dot = text.MoveRight(this.text, dot, word)
+		}
+	case key == input.KeyBackspace:
+		this.text, dot = text.Backspace(this.text, dot, word)
+		changed = true
+	case key == input.KeyDelete:
+		this.text, dot = text.Delete(this.text, dot, word)
+		changed = true
+	case key == input.Key('a') && modifiers.Control:
+		dot.Start = 0
+		dot.End   = len(this.text)
+	case key.Printable():
+		this.text, dot = text.Type(this.text, dot, rune(key))
+		changed = true
+	}
+
+	this.Select(dot)
+	if changed {
+		this.SetText(string(this.text))
+		this.on.edit.Broadcast()
+	}
+}
+
+func (this *TextInput) handleScroll (x, y float64) {
+	this.ScrollTo(this.ContentBounds().Min.Add(image.Pt(int(x), int(y))))
+}