Added tooltips.

buyflowerbutton.go

@@ -21,7 +21,7 @@ type BuyFlowerButton struct {
 
 func NewBuyFlowerButton(icon, iconDisabled, flowerID string, flower FlowerDescriptor, onClick EventContextFn) *BuyFlowerButton {
 	return &BuyFlowerButton{
-		IconButton: *NewIconButtonConfig(icon, onClick, func(b *IconButton) {
+		IconButton: *NewIconButtonConfigure(icon, onClick, func(b *IconButton) {
 			b.IconDisabled = iconDisabled
 			b.IsDisabled = !flower.Unlocked
 		}),

cmd/tins2020/tins2020.go

@@ -136,6 +136,8 @@ func run() error {
 					app.Arrange(ctx, tins2020.RectAbs(0, 0, w, h))
 					ctx.Settings.Window.Size = tins2020.PtPtr(w, h)
 				}
+			case *sdl.MouseMotionEvent:
+				ctx.MousePosition = tins2020.Pt(e.X, e.Y)
 			}
 			app.Handle(ctx, event)
 		}

context.go

@@ -11,6 +11,7 @@ type Context struct {
 	Resources     Resources
 	Textures      Textures
 	Settings      Settings
+	MousePosition Point
 	ShouldQuit    bool
 }
 

control.go

@@ -22,12 +22,35 @@ func EmptyEvent(fn EventFn) EventContextFn {
 type ControlBase struct {
 	Bounds Rectangle
 
+	FontName   string
+	Foreground sdl.Color
+
 	IsDisabled  bool
 	IsMouseOver bool
 
 	OnLeftMouseButtonClick EventContextFn
 }
 
+func (c *ControlBase) ActualForeground() sdl.Color {
+	var none sdl.Color
+	if c.Foreground == none {
+		return MustHexColor("#ffffff")
+	}
+	return c.Foreground
+}
+
+func (c *ControlBase) ActualFont(ctx *Context) *Font {
+	name := c.ActualFontName()
+	return ctx.Fonts.Font(name)
+}
+
+func (c *ControlBase) ActualFontName() string {
+	if len(c.FontName) == 0 {
+		return "default"
+	}
+	return c.FontName
+}
+
 func (b *ControlBase) Arrange(ctx *Context, bounds Rectangle) { b.Bounds = bounds }
 
 func (b *ControlBase) Init(*Context) error { return nil }

gamecontrols.go

@@ -100,44 +100,61 @@ func (c *GameControls) Init(ctx *Context) error {
 	}
 
 	c.top.Orientation = OrientationHorizontal
-	c.pause = NewIconButtonConfig("control-pause", EmptyEvent(func() {
+	c.pause = NewIconButtonConfigure("control-pause", EmptyEvent(func() {
 		c.game.Pause()
 	}), func(b *IconButton) {
 		b.IconDisabled = "control-pause-disabled"
+		b.Tooltip.Text = "Pause game"
 	})
-	c.run = NewIconButtonConfig("control-run", EmptyEvent(func() {
+	c.run = NewIconButtonConfigure("control-run", EmptyEvent(func() {
 		c.game.Run()
 	}), func(b *IconButton) {
 		b.IconDisabled = "control-run-disabled"
+		b.Tooltip.Text = "Run game at normal speed"
 	})
-	c.runFast = NewIconButtonConfig("control-run-fast", EmptyEvent(func() {
+	c.runFast = NewIconButtonConfigure("control-run-fast", EmptyEvent(func() {
 		c.game.RunFast()
 	}), func(b *IconButton) {
 		b.IconDisabled = "control-run-fast-disabled"
+		b.Tooltip.Text = "Run game at fast speed"
 	})
 	c.speedChanged(c.game.Speed)
 	c.top.Buttons = []Control{c.pause, c.run, c.runFast}
 
 	c.menu.Background = MustHexColor("#356dad")
 	c.menu.Buttons = []Control{
-		NewIconButtonConfig("control-settings", c.dialogs.ShowSettings, func(b *IconButton) {
+		NewIconButtonConfigure("control-settings", c.dialogs.ShowSettings, func(b *IconButton) {
 			b.IsDisabled = true
 			b.IconDisabled = "#afafaf"
 		}),
-		NewIconButton("control-save", func(*Context) { c.game.Save() }),
+		NewIconButtonConfigure("control-save", func(*Context) { c.game.Save() }, func(b *IconButton) {
-		NewIconButton("control-load", func(ctx *Context) {
+			b.Tooltip.Text = "Save game (overwrites previous save; no confirmation)"
+		}),
+		NewIconButtonConfigure("control-load", func(ctx *Context) {
 			c.game.Load()
 			c.updateFlowerControls(ctx)
+		}, func(b *IconButton) {
+			b.Tooltip.Text = "Load last saved game (no confirmation)"
 		}),
-		NewIconButton("control-new", func(ctx *Context) {
+		NewIconButtonConfigure("control-new", func(ctx *Context) {
 			c.game.New()
 			c.updateFlowerControls(ctx)
+		}, func(b *IconButton) {
+			b.Tooltip.Text = "Start new game (no confirmation)"
+		}),
+		NewIconButtonConfigure("control-information", c.dialogs.ShowIntro, func(b *IconButton) {
+			b.Tooltip.Text = "Show information/intro"
 		}),
-		NewIconButton("control-information", c.dialogs.ShowIntro),
 	}
 
-	c.shovel = NewIconButtonConfig("control-shovel", func(*Context) { c.game.SelectShovel() }, func(b *IconButton) { b.IconHeight = 32 })
+	c.shovel = NewIconButtonConfigure("control-shovel", func(*Context) { c.game.SelectShovel() }, func(b *IconButton) {
-	c.research = NewIconButtonConfig("control-research", c.dialogs.ShowResearch, func(b *IconButton) { b.IconHeight = 32 })
+		b.IconHeight = 32
+		b.Tooltip.Text = "Select harvest tool (key: H)"
+	})
+	c.research = NewIconButtonConfigure("control-research", c.dialogs.ShowResearch, func(b *IconButton) {
+		b.IconHeight = 32
+		b.Tooltip.Text = "Conduct research (key: R)"
+	})
 	c.otherTools.Buttons = []Control{c.shovel, c.research}
 
 	c.Container.AddChild(&c.menu)

iconbutton.go

@@ -1,5 +1,9 @@
 package tins2020
 
+import (
+	"github.com/veandco/go-sdl2/sdl"
+)
+
 type HoverEffect int
 
 const (
@@ -19,6 +23,7 @@ type IconButton struct {
 	IconActive HoverEffect
 	IconHover  HoverEffect
 
+	Tooltip  Tooltip
 	IsActive bool
 }
 
@@ -31,7 +36,7 @@ func NewIconButton(icon string, onClick EventContextFn) *IconButton {
 	}
 }
 
-func NewIconButtonConfig(icon string, onClick EventContextFn, configure func(*IconButton)) *IconButton {
+func NewIconButtonConfigure(icon string, onClick EventContextFn, configure func(*IconButton)) *IconButton {
 	button := NewIconButton(icon, onClick)
 	configure(button)
 	return button
@@ -57,6 +62,31 @@ func (b *IconButton) activeTexture(ctx *Context) *Texture {
 	return ctx.Textures.Texture(b.Icon)
 }
 
+func (b *IconButton) Arrange(ctx *Context, bounds Rectangle) {
+	b.ControlBase.Arrange(ctx, bounds)
+	b.Tooltip.Arrange(ctx, bounds)
+}
+
+func (b *IconButton) Handle(ctx *Context, event sdl.Event) bool {
+	if b.ControlBase.Handle(ctx, event) {
+		return true
+	}
+	if b.Tooltip.Handle(ctx, event) {
+		return true
+	}
+	return false
+}
+
+func (b *IconButton) Init(ctx *Context) error {
+	if err := b.ControlBase.Init(ctx); err != nil {
+		return err
+	}
+	if err := b.Tooltip.Init(ctx); err != nil {
+		return err
+	}
+	return nil
+}
+
 func (b *IconButton) Render(ctx *Context) {
 	iconTexture := b.activeTexture(ctx)
 
@@ -81,6 +111,10 @@ func (b *IconButton) Render(ctx *Context) {
 		ctx.Renderer.FillRect(b.Bounds.SDLPtr())
 	}
 	iconTexture.SetColor(White)
+
+	if len(b.Tooltip.Text) > 0 && b.IsMouseOver {
+		b.Tooltip.Render(ctx)
+	}
 }
 
 type Scale int

label.go

@@ -2,37 +2,18 @@ package tins2020
 
 import (
 	"strings"
-
-	"github.com/veandco/go-sdl2/sdl"
 )
 
 type Label struct {
 	ControlBase
 
-	FontColor sdl.Color
-	FontName  string
 	Text      string
 	Alignment TextAlignment
 }
 
-func (l *Label) fontColor() sdl.Color {
-	var none sdl.Color
-	if l.FontColor == none {
-		return MustHexColor("#ffffff")
-	}
-	return l.FontColor
-}
-
-func (l *Label) fontName() string {
-	if len(l.FontName) == 0 {
-		return "default"
-	}
-	return l.FontName
-}
-
 func (l *Label) Render(ctx *Context) {
-	font := ctx.Fonts.Font(l.fontName())
+	font := ctx.Fonts.Font(l.ActualFontName())
-	color := l.fontColor()
+	color := l.ActualForeground()
 	bottom := l.Bounds.Y + l.Bounds.H
 	switch l.Alignment {
 	case TextAlignmentCenter:
@@ -49,8 +30,8 @@ type Paragraph struct {
 }
 
 func (p *Paragraph) Render(ctx *Context) {
-	font := ctx.Fonts.Font(p.fontName())
+	font := ctx.Fonts.Font(p.ActualFontName())
-	color := p.fontColor()
+	color := p.ActualForeground()
 	fontHeight := int32(font.Height())
 	lines := strings.Split(p.Text, "\n")
 

largedialog.go

@@ -62,11 +62,10 @@ func (d *LargeDialog) Arrange(ctx *Context, bounds Rectangle) {
 }
 
 func (d *LargeDialog) Init(ctx *Context) error {
-	d.title = Label{
+	d.title.Text = "Botanim"
-		Text:      "Botanim",
+	d.title.FontName = "title"
-		FontName:  "title",
+	d.title.Alignment = TextAlignmentCenter
-		Alignment: TextAlignmentCenter,
+
-	}
 	d.close = IconButton{
 		Icon:      "control-cancel",
 		IconHover: HoverEffectColor,

tooltip.go

@@ -0,0 +1,59 @@
+package tins2020
+
+import "github.com/veandco/go-sdl2/sdl"
+
+type Tooltip struct {
+	ControlBase
+
+	Text string
+}
+
+const tooltipBorderThickness = 1
+const tooltipHorizontalPadding = 4
+const tooltipMouseDistance = 12
+
+func (t *Tooltip) Handle(ctx *Context, event sdl.Event) bool {
+	if len(t.Text) == 0 {
+		return false
+	}
+
+	font := ctx.Fonts.Font(t.ActualFontName())
+	windowW, windowH, err := ctx.Renderer.GetOutputSize()
+	if err != nil {
+		return false
+	}
+
+	labelW, labelH, err := font.SizeUTF8(t.Text)
+	if err != nil {
+		return false
+	}
+
+	mouse := ctx.MousePosition
+	width := int32(labelW) + 2*tooltipBorderThickness + 2*tooltipHorizontalPadding
+	height := int32(labelH) + 2*tooltipBorderThickness
+
+	left := mouse.X + tooltipMouseDistance
+	top := mouse.Y + tooltipMouseDistance
+	if left+width > windowW {
+		left = mouse.X - tooltipMouseDistance - width
+	}
+	if top+height > windowH {
+		top = mouse.Y - tooltipMouseDistance - height
+	}
+
+	t.Bounds = Rect(left, top, width, height)
+	return false
+}
+
+func (t *Tooltip) Render(ctx *Context) {
+	SetDrawColor(ctx.Renderer, Black)
+	ctx.Renderer.FillRect(t.Bounds.SDLPtr())
+
+	SetDrawColor(ctx.Renderer, White)
+	ctx.Renderer.DrawRect(t.Bounds.SDLPtr())
+
+	font := t.ActualFont(ctx)
+
+	bottomLeft := Pt(t.Bounds.X+tooltipBorderThickness+tooltipHorizontalPadding, t.Bounds.Y+t.Bounds.H-tooltipBorderThickness)
+	font.RenderCopy(ctx.Renderer, t.Text, bottomLeft, White)
+}