1 files changed, 120 insertions, 0 deletions
diff --git a/go/ui/hoverable.go b/go/ui/hoverable.go
new file mode 100644
index 00000000..54d4ec15
--- /dev/null
+++ b/go/ui/hoverable.go
@@ -0,0 +1,120 @@
+package ui
+
+import (
+	"muhq.space/muhqs-game/go/game"
+)
+
+const (
+	HOVER_THRESHOLD = 60
+
+	HOVER_CARD_WIDTH  = 500
+	HOVER_CARD_HEIGHT = 700
+)
+
+type Hoverable interface {
+	onHover(ticks int, x, y int, c *Collection) bool
+	stopHover(ticks int, x, y int) bool
+}
+
+type hoverWidget struct {
+	createHint func(x, y int) Widget
+	reset      func()
+	xMax, yMax int
+}
+
+func (h *hoverWidget) showHint(x, y int, c *Collection) {
+	hint := h.createHint(x, y)
+	if hint == nil {
+		return
+	}
+
+	c.AddWidget(hint)
+	h.reset = func() {
+		c.RemoveWidget(hint)
+	}
+}
+
+func (h *hoverWidget) onHover(ticks int, x, y int, c *Collection) bool {
+	if h.xMax == 0 || h.yMax == 0 {
+		width, height := c.Layout()
+		h.xMax = width
+		h.yMax = height
+	}
+
+	if ticks == HOVER_THRESHOLD {
+		h.showHint(x, y, c)
+		return true
+	}
+
+	return false
+}
+
+func (h *hoverWidget) stopHover(ticks int, x, y int) bool {
+	if h.reset != nil {
+		h.reset()
+	}
+	return true
+}
+
+type hoverCardView struct {
+	hoverWidget
+}
+
+func (h *hoverCardView) init(w Widget) {
+	h.createHint = func(x, y int) Widget {
+		card := w.FindObjectAt(x, y).(*game.Card)
+		if card == nil {
+			return nil
+		}
+
+		wx, wy := x, y
+		if x+HOVER_CARD_WIDTH > h.xMax || y+HOVER_CARD_HEIGHT > h.yMax {
+			wx = x - HOVER_CARD_WIDTH
+			wy = y - HOVER_CARD_HEIGHT
+		}
+		if wx < 0 {
+			wx = 0
+		}
+		if wy < 0 {
+			wy = 0
+		}
+
+		return NewScaledCardView(wx, wy, HOVER_CARD_WIDTH, HOVER_CARD_HEIGHT, card.Path())
+	}
+}
+
+type hoverPermInfo struct {
+	hoverWidget
+}
+
+func (h *hoverPermInfo) init(w Widget) {
+	h.createHint = func(x, y int) Widget {
+		obj := w.FindObjectAt(x, y)
+		if obj == nil {
+			return nil
+		}
+
+		perm, ok := obj.(game.Permanent)
+		if !ok {
+			return nil
+		}
+
+		hint := NewPermInfo(x+TILE_WIDTH, y, perm)
+
+		wx, wy := x, y
+		if hint.X+hint.Width > h.xMax || y+hint.Height > h.yMax {
+			wx = x - hint.Width
+			wy = y - hint.Height
+		}
+		if wx < 0 {
+			wx = 0
+		}
+		if wy < 0 {
+			wy = 0
+		}
+
+		hint.X, hint.Y = wx, wy
+
+		return hint
+	}
+}