TUN-3201: Create base cloudflared UI structure

vendor/github.com/rivo/tview/button.go

@@ -0,0 +1,157 @@
+package tview
+
+import (
+	"github.com/gdamore/tcell"
+)
+
+// Button is labeled box that triggers an action when selected.
+//
+// See https://github.com/rivo/tview/wiki/Button for an example.
+type Button struct {
+	*Box
+
+	// The text to be displayed before the input area.
+	label string
+
+	// The label color.
+	labelColor tcell.Color
+
+	// The label color when the button is in focus.
+	labelColorActivated tcell.Color
+
+	// The background color when the button is in focus.
+	backgroundColorActivated tcell.Color
+
+	// An optional function which is called when the button was selected.
+	selected func()
+
+	// An optional function which is called when the user leaves the button. A
+	// key is provided indicating which key was pressed to leave (tab or backtab).
+	blur func(tcell.Key)
+}
+
+// NewButton returns a new input field.
+func NewButton(label string) *Button {
+	box := NewBox().SetBackgroundColor(Styles.ContrastBackgroundColor)
+	box.SetRect(0, 0, TaggedStringWidth(label)+4, 1)
+	return &Button{
+		Box:                      box,
+		label:                    label,
+		labelColor:               Styles.PrimaryTextColor,
+		labelColorActivated:      Styles.InverseTextColor,
+		backgroundColorActivated: Styles.PrimaryTextColor,
+	}
+}
+
+// SetLabel sets the button text.
+func (b *Button) SetLabel(label string) *Button {
+	b.label = label
+	return b
+}
+
+// GetLabel returns the button text.
+func (b *Button) GetLabel() string {
+	return b.label
+}
+
+// SetLabelColor sets the color of the button text.
+func (b *Button) SetLabelColor(color tcell.Color) *Button {
+	b.labelColor = color
+	return b
+}
+
+// SetLabelColorActivated sets the color of the button text when the button is
+// in focus.
+func (b *Button) SetLabelColorActivated(color tcell.Color) *Button {
+	b.labelColorActivated = color
+	return b
+}
+
+// SetBackgroundColorActivated sets the background color of the button text when
+// the button is in focus.
+func (b *Button) SetBackgroundColorActivated(color tcell.Color) *Button {
+	b.backgroundColorActivated = color
+	return b
+}
+
+// SetSelectedFunc sets a handler which is called when the button was selected.
+func (b *Button) SetSelectedFunc(handler func()) *Button {
+	b.selected = handler
+	return b
+}
+
+// SetBlurFunc sets a handler which is called when the user leaves the button.
+// The callback function is provided with the key that was pressed, which is one
+// of the following:
+//
+//   - KeyEscape: Leaving the button with no specific direction.
+//   - KeyTab: Move to the next field.
+//   - KeyBacktab: Move to the previous field.
+func (b *Button) SetBlurFunc(handler func(key tcell.Key)) *Button {
+	b.blur = handler
+	return b
+}
+
+// Draw draws this primitive onto the screen.
+func (b *Button) Draw(screen tcell.Screen) {
+	// Draw the box.
+	borderColor := b.borderColor
+	backgroundColor := b.backgroundColor
+	if b.focus.HasFocus() {
+		b.backgroundColor = b.backgroundColorActivated
+		b.borderColor = b.labelColorActivated
+		defer func() {
+			b.borderColor = borderColor
+		}()
+	}
+	b.Box.Draw(screen)
+	b.backgroundColor = backgroundColor
+
+	// Draw label.
+	x, y, width, height := b.GetInnerRect()
+	if width > 0 && height > 0 {
+		y = y + height/2
+		labelColor := b.labelColor
+		if b.focus.HasFocus() {
+			labelColor = b.labelColorActivated
+		}
+		Print(screen, b.label, x, y, width, AlignCenter, labelColor)
+	}
+}
+
+// InputHandler returns the handler for this primitive.
+func (b *Button) InputHandler() func(event *tcell.EventKey, setFocus func(p Primitive)) {
+	return b.WrapInputHandler(func(event *tcell.EventKey, setFocus func(p Primitive)) {
+		// Process key event.
+		switch key := event.Key(); key {
+		case tcell.KeyEnter: // Selected.
+			if b.selected != nil {
+				b.selected()
+			}
+		case tcell.KeyBacktab, tcell.KeyTab, tcell.KeyEscape: // Leave. No action.
+			if b.blur != nil {
+				b.blur(key)
+			}
+		}
+	})
+}
+
+// MouseHandler returns the mouse handler for this primitive.
+func (b *Button) MouseHandler() func(action MouseAction, event *tcell.EventMouse, setFocus func(p Primitive)) (consumed bool, capture Primitive) {
+	return b.WrapMouseHandler(func(action MouseAction, event *tcell.EventMouse, setFocus func(p Primitive)) (consumed bool, capture Primitive) {
+		if !b.InRect(event.Position()) {
+			return false, nil
+		}
+
+		// Process mouse event.
+		if action == MouseLeftClick {
+			setFocus(b)
+			if b.selected != nil {
+				b.selected()
+			}
+			consumed = true
+		}
+
+		return
+	})
+}