added label-button widget (#989)

Co-authored-by: M. Sz <mszeptuch@protonmail.com>

d2core/d2ui/label_button.go

@@ -0,0 +1,121 @@
+package d2ui
+
+import (
+	"image/color"
+
+	"github.com/OpenDiablo2/OpenDiablo2/d2common/d2interface"
+	"github.com/OpenDiablo2/OpenDiablo2/d2common/d2util"
+)
+
+const (
+	white = 0xffffffff
+)
+
+// static checks to ensure LabelButton implemented Widget and ClickableWidget
+var _ Widget = &LabelButton{}
+var _ ClickableWidget = &LabelButton{}
+
+// LabelButton represents LabelButton
+type LabelButton struct {
+	*BaseWidget
+	stdColor   color.Color
+	hoverColor color.Color
+	onClick    func()
+	label      *Label
+
+	*d2util.Logger
+}
+
+// NewLabelButton creates a label-button
+func (ui *UIManager) NewLabelButton(font, palette string) *LabelButton {
+	base := NewBaseWidget(ui)
+	base.SetVisible(true)
+
+	result := &LabelButton{
+		BaseWidget: base,
+		stdColor:   d2util.Color(white),
+	}
+
+	result.label = ui.NewLabel(font, palette)
+	result.label.Alignment = HorizontalAlignCenter
+	result.label.Color[0] = result.stdColor
+
+	ui.addWidget(result)
+
+	return result
+}
+
+// SetText sets button's text
+func (b *LabelButton) SetText(text string) {
+	b.label.SetText(text)
+	b.width, b.height = b.label.GetSize()
+}
+
+// SetColors sets label-button colors (on normal and hovered state)
+func (b *LabelButton) SetColors(normColor, hoverColor color.Color) {
+	b.stdColor = normColor
+	b.hoverColor = hoverColor
+}
+
+// GetSize returns label's size
+func (b *LabelButton) GetSize() (x, y int) {
+	return b.label.GetSize()
+}
+
+// GetPosition returns real position (including offset for the alignment)
+func (b *LabelButton) GetPosition() (x, y int) {
+	return b.x - b.label.getAlignOffset(b.width), b.y
+}
+
+// OnActivated defines the callback handler for the activate event
+func (b *LabelButton) OnActivated(cb func()) {
+	b.onClick = cb
+}
+
+// Activate calls the on activated callback handler, if any
+func (b *LabelButton) Activate() {
+	if b.onClick == nil {
+		return
+	}
+
+	b.onClick()
+}
+
+// SetEnabled sets the enabled state
+func (b *LabelButton) SetEnabled(_ bool) {
+	// noop
+}
+
+// GetEnabled returns the enabled state
+func (b *LabelButton) GetEnabled() bool {
+	return true
+}
+
+// SetPressed sets the pressed state of the button
+func (b *LabelButton) SetPressed(_ bool) {
+	// noop
+}
+
+// GetPressed returns the pressed state of the button
+func (b *LabelButton) GetPressed() bool {
+	return false
+}
+
+// Advance advances the label-button
+func (b *LabelButton) Advance(_ float64) error {
+	return nil
+}
+
+// Render renders label-button
+func (b *LabelButton) Render(target d2interface.Surface) {
+	target.PushTranslation(b.GetPosition())
+	defer target.Pop()
+
+	b.label.Render(target)
+
+	if b.isHovered() {
+		b.label.Color[0] = b.hoverColor
+	} else {
+		b.label.Color[0] = b.stdColor
+	}
+}