Fix issues with grid layout

calendar.go

@@ -0,0 +1,167 @@
+package objects
+
+import "fmt"
+import "time"
+import "git.tebibyte.media/tomo/tomo"
+import "git.tebibyte.media/tomo/tomo/event"
+import "git.tebibyte.media/tomo/objects/layouts"
+
+// Calendar is an object that can display a date and allow the user to change
+// it. It can display one month at a time.
+type Calendar struct {
+	tomo.ContainerBox
+	
+	grid tomo.ContainerBox
+	time time.Time
+	monthLabel *Label
+	
+	on struct {
+		edit event.FuncBroadcaster
+	}
+}
+
+// NewCalendar creates a new calendar with the specified date.
+func NewCalendar (tm time.Time) *Calendar {
+	calendar := &Calendar {
+		ContainerBox: tomo.NewContainerBox(),
+		time:         tm,
+	}
+	calendar.SetRole(tomo.R("objects", "Calendar", ""))
+	calendar.SetLayout(layouts.ContractVertical)
+	
+	prevButton := NewButton("")
+	prevButton.SetIcon(tomo.IconGoPrevious)
+	prevButton.OnClick(func () {
+		calendar.prevMonth()
+		calendar.on.edit.Broadcast()
+	})
+	nextButton := NewButton("")
+	nextButton.SetIcon(tomo.IconGoNext)
+	nextButton.OnClick(func () {
+		calendar.nextMonth()
+		calendar.on.edit.Broadcast()
+	})
+	calendar.monthLabel = NewLabel("")
+	calendar.monthLabel.SetAlign(tomo.AlignMiddle, tomo.AlignMiddle)
+	
+	calendar.grid = tomo.NewContainerBox()
+	calendar.grid.SetRole(tomo.R("objects", "CalendarGrid", ""))
+	calendar.grid.SetLayout(layouts.NewGrid (
+		[]bool { true, true, true, true, true, true, true },
+		[]bool { }))
+	calendar.Add(NewInnerContainer (
+		layouts.Row { false, true, false },
+		prevButton, calendar.monthLabel, nextButton))
+	calendar.Add(calendar.grid)
+	
+	calendar.OnScroll(calendar.handleScroll)
+	calendar.CaptureScroll(true)
+	
+	calendar.refresh()
+	return calendar
+}
+
+// SetTime sets the date the calendar will display.
+func (this *Calendar) SetTime (tm time.Time) {
+	if this.time == tm { return }
+	this.time = tm
+	this.refresh()
+}
+
+// OnEdit sets a function to be called when the user changes the date on the
+// calendar.
+func (this *Calendar) OnEdit (callback func ()) {
+	this.on.edit.Connect(callback)
+}
+
+func (this *Calendar) prevMonth () {
+	this.time = firstOfMonth(this.time.Add(24 * time.Hour * -20))
+	this.refresh()
+}
+
+func (this *Calendar) nextMonth () {
+	this.time = firstOfMonth(this.time.Add(24 * time.Hour * 40))
+	this.refresh()
+}
+
+var weekdayAbbreviations = []string {
+	"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat",
+}
+
+func (this *Calendar) refresh () {
+	this.monthLabel.SetText(this.time.Format("2006 January"))
+
+	this.grid.Clear()
+	for _, day := range weekdayAbbreviations {
+		dayLabel := tomo.NewTextBox()
+		dayLabel.SetRole(tomo.R("objects", "CalendarWeekdayHeader", ""))
+		dayLabel.SetText(day)
+		dayLabel.SetAlign(tomo.AlignMiddle, tomo.AlignMiddle)
+		this.grid.Add(dayLabel)
+	}
+	
+	dayIter := 0 - int(firstOfMonth(this.time).Weekday())
+	if dayIter <= -6 {
+		dayIter = 1
+	}
+	weekday := 0
+	totalDays := daysInMonth(this.time)
+	for ; dayIter <= totalDays; dayIter ++ {
+		weekday = (weekday + 1) % 7
+		if dayIter > 0 {
+			day := tomo.NewTextBox()
+			day.SetText(fmt.Sprint(dayIter))
+			if weekday == 1 || weekday == 0 {
+				day.SetRole(tomo.R("objects", "CalendarDay", "weekend"))
+			} else {
+				day.SetRole(tomo.R("objects", "CalendarDay", "weekday"))
+			}
+			this.grid.Add(day)
+		} else {
+			this.grid.Add(tomo.NewBox())
+		}
+	}
+}
+
+func (this *Calendar) handleScroll (x, y float64) {
+	if y < 0 {
+		this.prevMonth()
+	} else {
+		this.nextMonth()
+	}
+}
+
+func firstOfMonth (tm time.Time) time.Time {
+	return time.Date(tm.Year(), tm.Month(), 0, 0, 0, 0, 0, time.Local)
+}
+
+func daysInMonth (tm time.Time) (days int) {
+	year  := tm.Year()
+	month := tm.Month()
+	switch month {
+	case 1:  days = 31
+	case 2:
+		// betcha didn't know this about leap years
+		if year % 4 == 0 && (year % 100 != 0 || year % 400 == 0) {
+			days = 29
+		} else {
+			days = 28
+		}
+	case 3:  days = 31
+	case 4:  days = 30
+	case 5:  days = 31
+	case 6:  days = 30
+	case 7:  days = 31
+	case 8:  days = 31
+	case 9:  days = 30
+	case 10: days = 31
+	case 11: days = 30
+	case 12: days = 31
+	}
+
+	return
+}
+
+func canonMonth (tm time.Time) int {
+	return int(tm.Month() - 1) + tm.Year() * 12
+}

checkbox.go

@@ -19,7 +19,7 @@ func NewCheckbox (value bool) *Checkbox {
 		Box: tomo.NewBox(),
 	}
 	box.SetRole(tomo.R("objects", "Checkbox", ""))
-	box.SetValue(false)
+	box.SetValue(value)
 	
 	box.OnMouseUp(box.handleMouseUp)
 	box.OnKeyUp(box.handleKeyUp)

internal/color.go

@@ -0,0 +1,106 @@
+package internal
+
+type HSVA struct {
+	H float64
+	S float64
+	V float64
+	A uint8
+}
+
+func (hsva HSVA) RGBA () (r, g, b, a uint32) {
+	// Adapted from:
+	// https://www.cs.rit.edu/~ncs/color/t_convert.html
+	
+	component := func (x float64) uint32 {
+		return uint32(float64(0xFFFF) * x)
+	}
+
+	ca := uint32(hsva.A) << 8
+	s := clamp01(hsva.S)
+	v := clamp01(hsva.V)
+	if s == 0 {
+		light := component(v)
+		return light, light, light, ca
+	}
+	
+	h := clamp01(hsva.H) * 360
+	sector := int(h / 60)
+	offset := (h / 60) - float64(sector)
+	
+	fac := float64(hsva.A) / 255
+	p  := component(fac * v * (1 - s))
+	q  := component(fac * v * (1 - s * offset))
+	t  := component(fac * v * (1 - s * (1 - offset)))
+	va := component(v)
+	
+	switch sector {
+	case 0:  return va, t,  p,  ca
+	case 1:  return q,  va, p,  ca
+	case 2:  return p,  va, t,  ca
+	case 3:  return p,  q,  va, ca
+	case 4:  return t,  p,  va, ca
+	default: return va, p,  q,  ca
+	}
+}
+
+// Canon returns the color but with the H, S, and V fields are constrained to
+// the range 0.0-1.0
+func (hsva HSVA) Canon () HSVA {
+	hsva.H = clamp01(hsva.H)
+	hsva.S = clamp01(hsva.S)
+	hsva.V = clamp01(hsva.V)
+	return hsva
+}
+
+func clamp01 (x float64) float64 {
+	if x > 1.0 { return 1.0 }
+	if x < 0.0 { return 0.0 }
+	return x
+}
+
+func RGBAToHSVA (r, g, b, a uint32) HSVA {
+	// Adapted from:
+	// https://www.cs.rit.edu/~ncs/color/t_convert.html
+	
+	// FIXME: this does not always work!
+
+	component := func (x uint32) float64 {
+		return clamp01(float64(x) / 0xFFFF)
+	}
+	cr := component(r)
+	cg := component(g)
+	cb := component(b)
+	
+	var maxComponent float64
+	if cr > maxComponent { maxComponent = cr }
+	if cg > maxComponent { maxComponent = cg }
+	if cb > maxComponent { maxComponent = cb }
+	var minComponent = 1.0
+	if cr < minComponent { minComponent = cr }
+	if cg < minComponent { minComponent = cg }
+	if cb < minComponent { minComponent = cb }
+	
+	hsva := HSVA {
+		V: maxComponent,
+		A: uint8(a >> 8),
+	}
+	
+	delta := maxComponent - minComponent
+	if maxComponent == 0 {
+		// hsva.S is undefined, so hue doesn't matter
+		return hsva
+	}
+	hsva.S = delta / maxComponent
+	
+	switch {
+	case cr == maxComponent: hsva.H =     (cg - cb) / delta
+	case cg == maxComponent: hsva.H = 2 + (cb - cr) / delta
+	case cb == maxComponent: hsva.H = 4 + (cr - cg) / delta
+	}
+	
+	hsva.H *= 60
+	if hsva.H < 0 { hsva.H += 360 }
+	hsva.H /= 360
+	
+	return hsva
+}

label.go

@@ -12,5 +12,6 @@ func NewLabel (text string) *Label {
 	this := &Label { TextBox: tomo.NewTextBox() }
 	this.SetRole(tomo.R("objects", "Label", ""))
 	this.SetText(text)
+	this.SetAlign(tomo.AlignStart, tomo.AlignMiddle)
 	return this
 }

layouts/flow.go

@@ -38,6 +38,7 @@ func (flow Flow) Arrange (hints tomo.LayoutHints, boxes []tomo.Box) {
 	minorSteps :=
 		(flow.deltaMinor(hints.Bounds) + flow.minor(hints.Gap)) /
 		(minorSize + flow.minor(hints.Gap))
+	if minorSteps < 1 { minorSteps = 1 }
 
 	// arrange
 	point := hints.Bounds.Min

layouts/grid.go

@@ -106,15 +106,14 @@ func expand (hints tomo.LayoutHints, sizes []int, space int, expands func (int)
 }
 
 func ceilDiv (x, y int) int {
+	if y == 0 { return 0 }
 	return int(math.Ceil(float64(x) / float64(y)))
 }
 
 func (this *Grid) RecommendedHeight (hints tomo.LayoutHints, boxes []tomo.Box, width int) int {
-	// TODO
-	return 0
+	return this.MinimumSize(hints, boxes).Y
 }
 
 func (this *Grid) RecommendedWidth (hints tomo.LayoutHints, boxes []tomo.Box, height int) int {
-	// TODO
-	return 0
+	return this.MinimumSize(hints, boxes).X
 }

slider.go

@@ -1,5 +1,6 @@
 package objects
 
+import "math"
 import "image"
 import "git.tebibyte.media/tomo/tomo"
 import "git.tebibyte.media/tomo/tomo/input"
@@ -33,6 +34,7 @@ func newSlider (orient string, value float64) *Slider {
 		},
 		layout: sliderLayout {
 			vertical: orient == "vertical",
+			value:    math.NaN(),
 		},
 		step: 0.05,
 	}

tabbedcontainer.go

@@ -0,0 +1,126 @@
+package objects
+
+import "git.tebibyte.media/tomo/tomo"
+import "git.tebibyte.media/tomo/tomo/input"
+import "git.tebibyte.media/tomo/objects/layouts"
+
+type TabbedContainer struct {
+	tomo.ContainerBox
+	
+	leftSpacer  tomo.Box
+	rightSpacer tomo.Box
+	tabsRow tomo.ContainerBox
+	active string
+	tabs []*tab
+}
+
+func NewTabbedContainer () *TabbedContainer {
+	container := &TabbedContainer {
+		ContainerBox: tomo.NewContainerBox(),
+	}
+	container.SetRole(tomo.R("objects", "TabbedContainer", ""))
+	container.SetLayout(layouts.Column { false, true } )
+	
+	container.tabsRow = tomo.NewContainerBox()
+	container.tabsRow.SetRole(tomo.R("objects", "TabRow", ""))
+	container.Add(container.tabsRow)
+	
+	container.leftSpacer = tomo.NewBox()
+	container.leftSpacer.SetRole(tomo.R("objects", "TabSpacer", "left"))
+	container.rightSpacer = tomo.NewBox()
+	container.rightSpacer.SetRole(tomo.R("objects", "TabSpacer", "right"))
+	
+	container.ClearTabs()
+	container.setTabRowLayout()
+	return container
+}
+
+func (this *TabbedContainer) Activate (name string) {
+	if _, tab := this.findTab(this.active); tab != nil {
+		tab.setActive(false)
+		this.Remove(tab.root)
+	}
+	if _, tab := this.findTab(name); tab != nil {
+		tab.setActive(true)
+		this.Add(tab.root)
+	} else {
+		name = ""
+	}
+	this.active = name
+}
+
+func (this *TabbedContainer) AddTab (name string, root tomo.Object) {
+	tab := &tab {
+		TextBox: tomo.NewTextBox(),
+		name:    name,
+		root:    root,
+	}
+	tab.SetRole(tomo.R("objects", "Tab", ""))
+	tab.SetText(name)
+	tab.OnMouseDown(func (button input.Button) {
+		if button != input.ButtonLeft { return }
+		this.Activate(name)
+	})
+	
+	this.tabs = append(this.tabs, tab)
+	this.tabsRow.Insert(tab, this.rightSpacer)
+	this.setTabRowLayout()
+	
+	// if the row was empty before, activate this tab
+	if len(this.tabs) == 1 {
+		this.Activate(name)	
+	}
+}
+
+func (this *TabbedContainer) RemoveTab (name string) {
+	index, tab := this.findTab(name)
+	if index < 0 { return }
+	nextIndex := index - 1
+	
+	this.tabsRow.Remove(tab)
+	this.tabs = append(this.tabs[:index], this.tabs[index - 1:]...)
+	this.setTabRowLayout()
+	
+	if nextIndex < 0               { nextIndex = 0 }
+	if nextIndex >= len(this.tabs) { nextIndex = len(this.tabs) - 1 }
+	if nextIndex < 0 {
+		this.Activate("")
+	} else {
+		this.Activate(this.tabs[nextIndex].name)
+	}
+}
+
+func (this *TabbedContainer) ClearTabs () {
+	this.tabs = nil
+	this.tabsRow.Clear()
+	this.tabsRow.Add(this.leftSpacer)
+	this.tabsRow.Add(this.rightSpacer)
+}
+
+func (this *TabbedContainer) setTabRowLayout () {
+	row := make(layouts.Row, 1 + len(this.tabs) + 1)
+	row[len(row) - 1] = true
+	this.tabsRow.SetLayout(row)
+}
+
+func (this *TabbedContainer) findTab (name string) (int, *tab) {
+	for index, tab := range this.tabs {
+		if tab.name == name { return index, tab }
+	}
+	return -1, nil
+}
+
+type tab struct {
+	tomo.TextBox
+	name string
+	root tomo.Object
+}
+
+func (this *tab) setActive (active bool) {
+	if active {
+		this.SetRole(tomo.R("objects", "Tab", "active"))
+	} else {
+		this.SetRole(tomo.R("objects", "Tab", ""))
+	}
+}
+