add button list activity to simplify challenges and future activities

1 files changed, 69 insertions, 0 deletions

diff --git a/go/activities/buttonList.go b/go/activities/buttonList.go
new file mode 100644
index 00000000..55e5d0de
--- /dev/null
+++ b/go/activities/buttonList.go
@@ -0,0 +1,69 @@
+package activities
+
+import (
+	"log"
+
+	"muhq.space/muhqs-game/go/ui"
+)
+
+// ButtonList is an Activity that tries to fill its vertical space with buttons
+// for the specified click handlers.
+// A last back button is appended calling activities.PopActivity()
+type ButtonList struct {
+	ui.Collection
+}
+
+const (
+	BUTTON_LIST_BUTTON_WIDTH   = 250
+	BUTTON_LIST_BUTTON_HEIGHT  = 75
+	BUTTON_LIST_BUTTON_PADDING = 40
+)
+
+func NewButtonList(width, height int, labels []string, handlers []func()) *ButtonList {
+	bl := &ButtonList{ui.Collection{Width: width, Height: height}}
+
+	if len(labels) != len(handlers) {
+		log.Panic("labels and handler mismatch")
+	}
+
+	x := (width - BUTTON_LIST_BUTTON_WIDTH) / 2
+	y := BUTTON_LIST_BUTTON_HEIGHT
+	for i, handler := range handlers {
+		btn := ui.NewSimpleButton(
+			x,
+			y,
+			BUTTON_LIST_BUTTON_WIDTH,
+			BUTTON_LIST_BUTTON_HEIGHT,
+			labels[i],
+			func(*ui.SimpleButton) { handler() },
+		)
+		bl.AddWidget(btn)
+
+		y = y + BUTTON_LIST_BUTTON_HEIGHT + BUTTON_LIST_BUTTON_PADDING
+		log.Println("add button at", x, y)
+	}
+
+	back := ui.NewSimpleButton(
+		x,
+		y,
+		BUTTON_LIST_BUTTON_WIDTH,
+		BUTTON_LIST_BUTTON_HEIGHT,
+		"back",
+		func(*ui.SimpleButton) { PopActivity() },
+	)
+	log.Println("add back button at", x, y)
+	bl.AddWidget(back)
+
+	return bl
+}
+
+func (bl *ButtonList) Layout(int, int) (int, int) {
+	return bl.Width, bl.Height
+}
+
+func (bl *ButtonList) Update() error {
+	if err := ui.Update(); err != nil {
+		return err
+	}
+	return bl.Collection.Update()
+}