game starts automatically with first cell click

bar.go

@@ -35,11 +35,7 @@ func NewBar(th *material.Theme) *Bar {
 func (b *Bar) Layout(gtx C) D {
 	// Handle events.
 	if b.restart.Clicked() {
-		if state.Running || state.Finished {
-			ResetGame()
-		} else {
-			StartGame()
-		}
+		ResetGame()
 	}
 
 	return layout.Stack{Alignment: layout.Center}.Layout(gtx,
@@ -91,12 +87,7 @@ func (b *Bar) Layout(gtx C) D {
 				}),
 				layout.Rigid(func(gtx C) D {
 					return layout.Center.Layout(gtx, func(gtx C) D {
-						t := "Start"
-						if state.Running || state.Finished {
-							t = "Reset"
-						}
-
-						return material.Button(b.th, &b.restart, t).Layout(gtx)
+						return material.Button(b.th, &b.restart, "Reset").Layout(gtx)
 					})
 				}),
 				layout.Flexed(1, func(gtx C) D {

grid.go

@@ -40,8 +40,8 @@ func NewGrid(th *material.Theme) *Grid {
 }
 
 func (g *Grid) Layout(gtx C) D {
-	if !state.Running {
-		// Disable events if game is not running.
+	if state.Finished {
+		// Disable events if game is finished.
 		gtx = gtx.Disabled()
 	}
 

state.go

@@ -6,7 +6,7 @@ import (
 )
 
 const (
-	defaultMines       = 20
+	defaultMines       = 40
 	defaultSecondsLeft = 180
 	defaultGridRows    = 20
 	defaultGridCols    = 15
@@ -64,8 +64,7 @@ func dispatch(a Action) {
 type ActionType int
 
 const (
-	startGame ActionType = iota
-	clickedCell
+	clickedCell ActionType = iota
 	resetGame
 	decrementTimer
 )
@@ -75,10 +74,6 @@ type Action struct {
 	Data interface{}
 }
 
-func StartGame() {
-	dispatch(Action{Type: startGame})
-}
-
 type clickedCellData struct {
 	idx        int
 	rightClick bool

state_reducer.go

@@ -13,8 +13,6 @@ func reducer(a Action) {
 	copy(s.Cells, state.Cells)
 
 	switch a.Type {
-	case startGame:
-		s = startGameReducer(s)
 	case clickedCell:
 		s = clickedCellReducer(s, a.Data.(clickedCellData))
 	case resetGame:
@@ -29,21 +27,16 @@ func reducer(a Action) {
 	state = s
 }
 
-func startGameReducer(s State) State {
-	if s.Running || s.Finished {
+func clickedCellReducer(s State, data clickedCellData) State {
+	// Do nothing, if game is finished.
+	if s.Finished {
 		return s
 	}
 
-	s.Running = true
-
-	atomic.StoreUint32(s.timerActive, 1)
-	return s
-}
-
-func clickedCellReducer(s State, data clickedCellData) State {
-	// Do nothing, if game is not running.
-	if !s.Running || s.Finished {
-		return s
+	// If game is not yet running, start it.
+	if !s.Running {
+		s.Running = true
+		atomic.StoreUint32(s.timerActive, 1)
 	}
 
 	cell := s.Cells[data.idx]