overhaul ui

* implement events instead of interfaces
  Interfaces and the wrappers head the problem that they could not support multiple events at once or only a single one without loosing the others.
* add text input support for WASM on mobile
  A hidden html input is required to open the keyboard and receive the
  input.
* improve the number choice
  * fix using the default number
  * add submit button only if a onclick method was provided

1 files changed, 67 insertions, 0 deletions

diff --git a/go/ui/textInput.go b/go/ui/textInput.go
new file mode 100644
index 00000000..3a7939c8
--- /dev/null
+++ b/go/ui/textInput.go
@@ -0,0 +1,67 @@
+package ui
+
+import (
+	"github.com/hajimehoshi/ebiten/v2"
+	"github.com/hajimehoshi/ebiten/v2/inpututil"
+)
+
+type TextInput struct {
+	TextBox
+	input   string
+	label   string
+	focused bool
+}
+
+func (ti *TextInput) InitTextInput(x, y int, width, height int, label string) {
+	ti.TextBox = *(NewFixedTextBox(x, y, width, height, "").Centering(true))
+	ti.input = ""
+	ti.label = label
+
+	ti.renderImpl = func() *ebiten.Image {
+		if ti.input == "" {
+			ti.text = ti.label
+		} else {
+			ti.text = ti.input
+		}
+
+		return ti.render()
+	}
+}
+
+func NewTextInput(x, y int, width, height int, label string) *TextInput {
+	w := &TextInput{}
+	w.InitTextInput(x, y, width, height, label)
+	return w
+}
+
+func (ti *TextInput) SetInput(input string) {
+	ti.input = input
+	ti.ForceRedraw()
+}
+
+func (ti *TextInput) AddInput(input []rune) {
+	ti.SetInput(ti.input + string(input))
+}
+
+func (ti *TextInput) HandleKey() {
+	if inpututil.IsKeyJustPressed(ebiten.KeyBackspace) {
+		if len(ti.input) > 0 {
+			ti.input = ti.input[:len(ti.input)-1]
+			ti.ForceRedraw()
+		}
+	}
+}
+
+func (ti *TextInput) Text() string {
+	return ti.input
+}
+
+// return the text or use label as fallback
+func (ti *TextInput) TextOrLabel() string {
+	if ti.input != "" {
+		return ti.input
+	}
+	return ti.label
+}
+
+func (*TextInput) IsFocusable() bool { return true }