Wait Modal

* Add modal.Wait() that creates a global progress bar modal which is not
  dismissable by the user; the caller must Dismiss() the modal
  themselves when ready.
* It will be useful in the future in case e.g. saving a Level needs to
  take a while to rebalance chunks and the modal prevents ALL
  interaction with the game so the user can't further modify the level
  while it's busy refactoring itself.
* Cheat code: "test wait screen" to show the Wait modal for 10 seconds.

pkg/balance/cheats.go

@@ -29,6 +29,7 @@ var (
 	CheatPlayAsBird       = "fly like a bird"
 	CheatGodMode          = "god mode"
 	CheatDebugLoadScreen  = "test load screen"
+	CheatDebugWaitScreen  = "test wait screen"
 	CheatUnlockLevels     = "master key"
 	CheatSkipLevel        = "warp whistle"
 )

pkg/cheats.go

@@ -5,6 +5,7 @@ import (
 	"time"
 
 	"git.kirsle.net/SketchyMaze/doodle/pkg/balance"
+	"git.kirsle.net/SketchyMaze/doodle/pkg/modal"
 	"git.kirsle.net/SketchyMaze/doodle/pkg/modal/loadscreen"
 )
 
@@ -168,6 +169,15 @@ func (c Command) cheatCommand(d *Doodle) bool {
 			loadscreen.Hide()
 		}()
 
+	case balance.CheatDebugWaitScreen:
+		m := modal.Wait("Crunching some numbers...").WithTitle("Please hold").Then(func() {
+			d.Flash("Wait modal dismissed.")
+		})
+		go func() {
+			time.Sleep(10 * time.Second)
+			m.Dismiss(true)
+		}()
+
 	case balance.CheatUnlockLevels:
 		balance.CheatEnabledUnlockLevels = !balance.CheatEnabledUnlockLevels
 		if balance.CheatEnabledUnlockLevels {

pkg/modal/modal.go

@@ -66,13 +66,13 @@ func Handled(ev *event.State) bool {
 	}
 
 	// Enter key submits the default button.
-	if keybind.Enter(ev) {
+	if keybind.Enter(ev) && !current.force {
 		current.Dismiss(true)
 		return true
 	}
 
 	// Escape key cancels the modal.
-	if keybind.Shutdown(ev) && current.cancelable {
+	if keybind.Shutdown(ev) && current.cancelable && !current.force {
 		current.Dismiss(false)
 		return true
 	}
@@ -124,6 +124,8 @@ type Modal struct {
 	window     *ui.Window
 	callback   func()
 	cancelable bool   // Escape key can cancel the modal
+	force      bool   // Enter key can not close the modal (e.g. Wait)
+	teardown   func() // Optional teardown logic a modal can attach.
 }
 
 // WithTitle sets the title of the modal.
@@ -144,4 +146,8 @@ func (m *Modal) Dismiss(call bool) {
 	if call && m.callback != nil {
 		m.callback()
 	}
+
+	if m.teardown != nil {
+		m.teardown()
+	}
 }

pkg/modal/wait.go

@@ -0,0 +1,140 @@
+package modal
+
+import (
+	"fmt"
+	"time"
+
+	"git.kirsle.net/SketchyMaze/doodle/pkg/balance"
+	"git.kirsle.net/go/render"
+	"git.kirsle.net/go/ui"
+)
+
+// Wait pops up a non-dismissable modal that the caller can close when they're ready.
+func Wait(message string, args ...interface{}) *Modal {
+	if !ready {
+		panic("modal.Wait(): not ready")
+	} else if current != nil {
+		current.Dismiss(false)
+	}
+
+	// Reset the supervisor.
+	supervisor = ui.NewSupervisor()
+
+	m := &Modal{
+		title:   "Wait",
+		message: fmt.Sprintf(message, args...),
+		force:   true,
+	}
+	m.window = makeWaitModal(m)
+
+	center(m.window)
+	current = m
+
+	return m
+}
+
+// creates the ui.Window for the Wait modal.
+func makeWaitModal(m *Modal) *ui.Window {
+	win := ui.NewWindow("Wait")
+	_, title := win.TitleBar()
+	title.TextVariable = &m.title
+
+	msgFrame := ui.NewFrame("Wait Message")
+	win.Pack(msgFrame, ui.Pack{
+		Side: ui.N,
+	})
+
+	msg := ui.NewLabel(ui.Label{
+		TextVariable: &m.message,
+		Font:         balance.UIFont,
+	})
+	msgFrame.Pack(msg, ui.Pack{
+		Side: ui.N,
+	})
+
+	// Create a bouncing progress bar.
+	var (
+		trough        *ui.Frame
+		troughW       = 250
+		progressBar   *ui.Frame
+		progressX     int
+		progressW     = 64
+		progressH     = 30
+		progressSpeed = 8
+		progressFreq  = 16 * time.Millisecond
+	)
+
+	trough = ui.NewFrame("Progress Trough")
+	trough.Configure(ui.Config{
+		Width:       troughW,
+		Height:      progressH,
+		BorderSize:  1,
+		BorderStyle: ui.BorderSunken,
+		Background:  render.Grey,
+	})
+	win.Pack(trough, ui.Pack{
+		Side:    ui.N,
+		Padding: 4,
+	})
+
+	progressBar = ui.NewFrame("Progress Bar")
+	progressBar.Configure(ui.Config{
+		Width:      progressW,
+		Height:     30,
+		Background: render.Green,
+	})
+	trough.Place(progressBar, ui.Place{
+		Left: progressX,
+		Top:  0,
+	})
+
+	trough.Compute(engine)
+
+	win.Compute(engine)
+	win.Supervise(supervisor)
+
+	// Animate the bouncing of the progress bar in a background goroutine,
+	// and allow canceling it when the modal is dismissed.
+	var (
+		cancel = make(chan interface{})
+		ping   = time.NewTicker(progressFreq)
+	)
+	go func() {
+		for {
+			select {
+			case <-cancel:
+				ping.Stop()
+				return
+			case <-ping.C:
+				// Have room to move the progress bar?
+				progressX += progressSpeed
+
+				// Cap it to within bounds.
+				if progressX+progressW >= troughW {
+					progressX = troughW - progressW
+					if progressSpeed > 0 {
+						progressSpeed *= -1
+					}
+				} else if progressX < 0 {
+					progressX = 0
+					if progressSpeed < 0 {
+						progressSpeed *= -1
+					}
+				}
+
+				trough.Place(progressBar, ui.Place{
+					Left: progressX,
+					Top:  0,
+				})
+				trough.Compute(engine)
+			}
+		}
+	}()
+
+	// Cancel the goroutine on modal teardown.
+	m.teardown = func() {
+		cancel <- nil
+	}
+
+	return win
+}