Update code for objects

button.go

@@ -30,14 +30,13 @@ func NewButton (text string) *Button {
 	}
 	box.SetRole(tomo.R("objects", "Button"))
 	box.label.SetAttr(tomo.AAlign(tomo.AlignMiddle, tomo.AlignMiddle))
-	box.SetLayout(buttonLayout)
+	box.SetAttr(tomo.ALayout(buttonLayout))
 	box.SetText(text)
 	
-	box.CatchDND(true)
+	box.SetInputMask(true)
-	box.CatchMouse(true)
-	
 	box.OnButtonDown(box.handleButtonDown)
 	box.OnButtonUp(box.handleButtonUp)
+	box.OnKeyDown(box.handleKeyDown)
 	box.OnKeyUp(box.handleKeyUp)
 	box.SetFocusable(true)
 	return box
@@ -80,27 +79,34 @@ func (this *Button) OnClick (callback func ()) event.Cookie {
 
 func (this *Button) applyLayout () {
 	if this.labelActive && this.icon == nil {
-		this.SetLayout(buttonLayout)
+		this.SetAttr(tomo.ALayout(buttonLayout))
 	} else if !this.labelActive && this.icon != nil {
-		this.SetLayout(iconButtonLayout)
+		this.SetAttr(tomo.ALayout(iconButtonLayout))
 	} else {
-		this.SetLayout(bothButtonLayout)
+		this.SetAttr(tomo.ALayout(bothButtonLayout))
 	}
 }
 
-func (this *Button) handleKeyUp (catch func (), key input.Key, numberPad bool) {
+func (this *Button) handleKeyDown (key input.Key, numberPad bool) bool {
-	if key != input.KeyEnter && key != input.Key(' ') { return }
+	if key != input.KeyEnter && key != input.Key(' ') { return false }
+	return true
+}
+
+func (this *Button) handleKeyUp (key input.Key, numberPad bool) bool {
+	if key != input.KeyEnter && key != input.Key(' ') { return false }
 	this.on.click.Broadcast()
+	return true
 }
 
-func (this *Button) handleButtonDown (catch func (), button input.Button) {
+func (this *Button) handleButtonDown (button input.Button) bool {
-	catch()
+	if button != input.ButtonLeft { return false }
+	return true
 }
 
-func (this *Button) handleButtonUp (catch func (), button input.Button) {
+func (this *Button) handleButtonUp (button input.Button) bool {
-	catch()
+	if button != input.ButtonLeft { return false }
-	if button != input.ButtonLeft { return }
 	if this.Window().MousePosition().In(this.Bounds()) {
 		this.on.click.Broadcast()
 	}
+	return true
 }

calendar.go

@@ -27,7 +27,7 @@ func NewCalendar (tm time.Time) *Calendar {
 		time:         tm,
 	}
 	calendar.SetRole(tomo.R("objects", "Calendar"))
-	calendar.SetLayout(layouts.ContractVertical)
+	calendar.SetAttr(tomo.ALayout(layouts.ContractVertical))
 	
 	prevButton := NewButton("")
 	prevButton.SetIcon(tomo.IconGoPrevious)
@@ -46,8 +46,8 @@ func NewCalendar (tm time.Time) *Calendar {
 	
 	calendar.grid = tomo.NewContainerBox()
 	calendar.grid.SetRole(tomo.R("objects", "CalendarGrid"))
-	calendar.grid.SetLayout(layouts.NewGrid (
+	calendar.grid.SetAttr(tomo.ALayout(layouts.NewGrid (
-		true, true, true, true, true, true, true)())
+		true, true, true, true, true, true, true)()))
 	calendar.Add(NewInnerContainer (
 		layouts.Row { false, true, false },
 		prevButton, calendar.monthLabel, nextButton))
@@ -128,13 +128,13 @@ func (this *Calendar) refresh () {
 	}
 }
 
-func (this *Calendar) handleScroll (catch func (), x, y float64) {
+func (this *Calendar) handleScroll (x, y float64) bool {
-	catch()
 	if y < 0 {
 		this.prevMonth()
 	} else {
 		this.nextMonth()
 	}
+	return true
 }
 
 func firstOfMonth (tm time.Time) time.Time {

checkbox.go

@@ -23,6 +23,7 @@ func NewCheckbox (value bool) *Checkbox {
 	
 	box.OnButtonDown(box.handleButtonDown)
 	box.OnButtonUp(box.handleButtonUp)
+	box.OnKeyDown(box.handleKeyDown)
 	box.OnKeyUp(box.handleKeyUp)
 	box.SetFocusable(true)
 	return box
@@ -52,19 +53,26 @@ func (this *Checkbox) OnValueChange (callback func ()) event.Cookie {
 	return this.on.valueChange.Connect(callback)
 }
 
-func (this *Checkbox) handleKeyUp (catch func (), key input.Key, numberPad bool) {
+func (this *Checkbox) handleKeyDown (key input.Key, numberPad bool) bool {
-	if key != input.KeyEnter && key != input.Key(' ') { return }
+	if key != input.KeyEnter && key != input.Key(' ') { return false }
 	this.Toggle()
+	return true
 }
 
-func (this *Checkbox) handleButtonDown (catch func (), button input.Button) {
+func (this *Checkbox) handleKeyUp (key input.Key, numberPad bool) bool {
-	catch()
+	if key != input.KeyEnter && key != input.Key(' ') { return false}
+	return true
 }
 
-func (this *Checkbox) handleButtonUp (catch func (), button input.Button) {
+func (this *Checkbox) handleButtonDown (button input.Button) bool {
-	catch()
+	if button != input.ButtonLeft { return false }
-	if button != input.ButtonLeft { return }
+	return true
+}
+
+func (this *Checkbox) handleButtonUp (button input.Button) bool {
+	if button != input.ButtonLeft { return false }
 	if this.Window().MousePosition().In(this.Bounds()) {
 		this.Toggle()
 	}
+	return true
 }

colorpicker.go

@@ -29,7 +29,7 @@ func NewColorPicker (value color.Color) *ColorPicker {
 		ContainerBox: tomo.NewContainerBox(),
 	}
 	picker.SetRole(tomo.R("objects", "ColorPicker"))
-	picker.SetLayout(layouts.Row { true, false, false })
+	picker.SetAttr(tomo.ALayout(layouts.Row { true, false, false }))
 	picker.pickerMap = newColorPickerMap(picker)
 	picker.Add(picker.pickerMap)
 	
@@ -97,20 +97,23 @@ func newColorPickerMap (parent *ColorPicker) *colorPickerMap {
 	return picker
 }
 
-func (this *colorPickerMap) handleButtonDown (catch func (), button input.Button) {
+func (this *colorPickerMap) handleButtonDown (button input.Button) bool {
-	if button != input.ButtonLeft { return }
+	if button != input.ButtonLeft { return false }
 	this.dragging = true
 	this.drag()
+	return true
 }
 
-func (this *colorPickerMap) handleButtonUp (catch func (), button input.Button) {
+func (this *colorPickerMap) handleButtonUp (button input.Button) bool {
-	if button != input.ButtonLeft || !this.dragging { return }
+	if button != input.ButtonLeft { return false }
 	this.dragging = false
+	return true
 }
 
-func (this *colorPickerMap) handleMouseMove () {
+func (this *colorPickerMap) handleMouseMove () bool {
-	if !this.dragging { return }
+	if !this.dragging { return false }
 	this.drag()
+	return true
 }
 
 func (this *colorPickerMap) drag () {

container.go

@@ -15,7 +15,7 @@ func newContainer (layout tomo.Layout, children ...tomo.Object) *Container {
 	this := &Container {
 		ContainerBox: tomo.NewContainerBox(),
 	}
-	this.SetLayout(layout)
+	this.SetAttr(tomo.ALayout(layout))
 	for _, child := range children {
 		this.Add(child)
 	}

labelcheckbox.go

@@ -24,7 +24,7 @@ func NewLabelCheckbox (value bool, text string) *LabelCheckbox {
 	box.label.SetAttr(tomo.AAlign(tomo.AlignStart, tomo.AlignMiddle))
 	box.Add(box.checkbox)
 	box.Add(box.label)
-	box.SetLayout(layouts.Row { false, true })
+	box.SetAttr(tomo.ALayout(layouts.Row { false, true }))
 
 	box.OnButtonDown(box.handleButtonDown)
 	box.OnButtonUp(box.handleButtonUp)
@@ -52,15 +52,16 @@ func (this *LabelCheckbox) OnValueChange (callback func ()) event.Cookie {
 	return this.checkbox.OnValueChange(callback)
 }
 
-func (this *LabelCheckbox) handleButtonDown (capture func (), button input.Button) {
+func (this *LabelCheckbox) handleButtonDown (button input.Button) bool {
-	capture()
+	if button != input.ButtonLeft { return false }
+	return true
 }
 
-func (this *LabelCheckbox) handleButtonUp (capture func (), button input.Button) {
+func (this *LabelCheckbox) handleButtonUp (button input.Button) bool {
-	capture()
+	if button != input.ButtonLeft { return false }
-	if button != input.ButtonLeft { return }
 	if this.Window().MousePosition().In(this.Bounds()) {
 		this.checkbox.SetFocused(true)
 		this.checkbox.Toggle()
 	}
+	return true
 }

labelswatch.go

@@ -26,7 +26,7 @@ func NewLabelSwatch (value color.Color, text string) *LabelSwatch {
 	box.label.SetAttr(tomo.AAlign(tomo.AlignStart, tomo.AlignMiddle))
 	box.Add(box.swatch)
 	box.Add(box.label)
-	box.SetLayout(layouts.Row { false, true })
+	box.SetAttr(tomo.ALayout(layouts.Row { false, true }))
 
 	box.OnButtonDown(box.handleButtonDown)
 	box.OnButtonUp(box.handleButtonUp)
@@ -60,15 +60,16 @@ func (this *LabelSwatch) OnConfirm (callback func ()) event.Cookie {
 	return this.swatch.OnConfirm(callback)
 }
 
-func (this *LabelSwatch) handleButtonDown (catch func (), button input.Button) {
+func (this *LabelSwatch) handleButtonDown (button input.Button) bool {
-	catch()
+	if button != input.ButtonLeft { return true }
+	return true
 }
 
-func (this *LabelSwatch) handleButtonUp (catch func (), button input.Button) {
+func (this *LabelSwatch) handleButtonUp (button input.Button) bool {
-	catch()
+	if button != input.ButtonLeft { return true }
-	if button != input.ButtonLeft { return }
 	if this.Window().MousePosition().In(this.Bounds()) {
 		this.swatch.SetFocused(true)
 		this.swatch.Choose()
 	}
+	return true
 }

menu.go

@@ -13,7 +13,7 @@ type Menu struct {
 	parent        tomo.Window
 	bounds        image.Rectangle
 	rootContainer tomo.ContainerBox
-	tearLine      tomo.Box
+	tearLine      tomo.Object
 	torn          bool
 }
 
@@ -36,22 +36,10 @@ func NewMenu (anchor tomo.Object, items ...tomo.Object) (*Menu, error) {
 	}
 
 	menu.rootContainer = tomo.NewContainerBox()
-	menu.rootContainer.SetLayout(layouts.ContractVertical)
+	menu.rootContainer.SetAttr(tomo.ALayout(layouts.ContractVertical))
 
 	if !menu.torn {
-		menu.tearLine = tomo.NewBox()
+		menu.tearLine = menu.newTearLine()
-		menu.tearLine.SetRole(tomo.R("objects", "TearLine"))
-		menu.tearLine.SetFocusable(true)
-		menu.tearLine.OnKeyUp(func (catch func (), key input.Key, numberPad bool) {
-			if key != input.KeyEnter && key != input.Key(' ') { return }
-			menu.TearOff()
-		})
-		menu.tearLine.OnButtonUp(func (catch func (), button input.Button) {
-			if button != input.ButtonLeft { return }
-			if menu.tearLine.Window().MousePosition().In(menu.tearLine.Bounds()) {
-				menu.TearOff()
-			}
-		})
 		menu.rootContainer.Add(menu.tearLine)
 	}
 	
@@ -92,6 +80,33 @@ func (this *Menu) TearOff () {
 	this.Window.SetVisible(visible)
 }
 
+func (this *Menu) newTearLine () tomo.Object {
+	tearLine := tomo.NewBox()
+	tearLine.SetRole(tomo.R("objects", "TearLine"))
+	tearLine.SetFocusable(true)
+	tearLine.OnKeyDown(func (key input.Key, numberPad bool) bool {
+		if key != input.KeyEnter && key != input.Key(' ') { return false }
+		return true
+	})
+	tearLine.OnKeyUp(func (key input.Key, numberPad bool) bool {
+		if key != input.KeyEnter && key != input.Key(' ') { return false }
+		this.TearOff()
+		return true
+	})
+	tearLine.OnButtonDown(func (button input.Button) bool {
+		if button != input.ButtonLeft { return false }
+		return true
+	})
+	tearLine.OnButtonUp(func (button input.Button) bool {
+		if button != input.ButtonLeft { return false }
+		if tearLine.Window().MousePosition().In(tearLine.Bounds()) {
+			this.TearOff()
+		}
+		return true
+	})
+	return tearLine
+}
+
 func menuBoundsFromAnchor (anchor tomo.Object) image.Rectangle {
 	bounds := anchor.GetBox().Bounds()
 	return image.Rect (

menuitem.go

@@ -27,16 +27,15 @@ func NewMenuItem (text string) *MenuItem {
 	}
 	box.SetRole(tomo.R("objects", "MenuItem"))
 	box.label.SetAttr(tomo.AAlign(tomo.AlignStart, tomo.AlignMiddle))
-	box.SetLayout(layouts.Row { false, true })
+	box.SetAttr(tomo.ALayout(layouts.Row { false, true }))
 	
 	box.Add(box.icon)
 	box.Add(box.label)
 	
-	box.CatchDND(true)
+	box.SetInputMask(true)
-	box.CatchMouse(true)
-	
 	box.OnButtonDown(box.handleButtonDown)
 	box.OnButtonUp(box.handleButtonUp)
+	box.OnKeyDown(box.handleKeyDown)
 	box.OnKeyUp(box.handleKeyUp)
 	box.SetFocusable(true)
 	return box
@@ -59,19 +58,26 @@ func (this *MenuItem) OnClick (callback func ()) event.Cookie {
 	return this.on.click.Connect(callback)
 }
 
-func (this *MenuItem) handleKeyUp (catch func(), key input.Key, numberPad bool) {
+func (this *MenuItem) handleKeyDown (key input.Key, numberPad bool) bool {
-	if key != input.KeyEnter && key != input.Key(' ') { return }
+	if key != input.KeyEnter && key != input.Key(' ') { return false }
+	return true
+}
+
+func (this *MenuItem) handleKeyUp (key input.Key, numberPad bool) bool {
+	if key != input.KeyEnter && key != input.Key(' ') { return false }
 	this.on.click.Broadcast()
+	return true
 }
 
-func (this *MenuItem) handleButtonDown (catch func(), button input.Button) {
+func (this *MenuItem) handleButtonDown (button input.Button) bool {
-	catch()
+	if button != input.ButtonLeft { return false }
+	return true
 }
 
-func (this *MenuItem) handleButtonUp (catch func(), button input.Button) {
+func (this *MenuItem) handleButtonUp (button input.Button) bool {
-	catch()
+	if button != input.ButtonLeft { return false }
-	if button != input.ButtonLeft { return }
 	if this.Window().MousePosition().In(this.Bounds()) {
 		this.on.click.Broadcast()
 	}
+	return true
 }

numberinput.go

@@ -32,15 +32,15 @@ func NewNumberInput (value float64) *NumberInput {
 	box.Add(box.input)
 	box.Add(box.decrement)
 	box.Add(box.increment)
-	box.SetLayout(layouts.Row { true, false, false })
+	box.SetAttr(tomo.ALayout(layouts.Row { true, false, false }))
 	box.increment.SetIcon(tomo.IconValueIncrement)
 	box.decrement.SetIcon(tomo.IconValueDecrement)
 	
 	box.SetValue(value)
 	
 	box.OnScroll(box.handleScroll)
-	box.OnKeyUp(box.handleKeyUp)
 	box.OnKeyDown(box.handleKeyDown)
+	box.OnKeyUp(box.handleKeyUp)
 	box.input.OnConfirm(box.handleConfirm)
 	box.input.OnValueChange(box.on.valueChange.Broadcast)
 	box.increment.OnClick(func () { box.shift(1)  })
@@ -76,29 +76,32 @@ func (this *NumberInput) shift (by int) {
 	this.on.valueChange.Broadcast()
 }
 
-func (this *NumberInput) handleKeyDown (catch func (), key input.Key, numpad bool) {
+func (this *NumberInput) handleKeyDown (key input.Key, numpad bool) bool {
 	switch key {
 	case input.KeyUp:
 		this.shift(1)
-		catch()
+		return true
 	case input.KeyDown:
 		this.shift(-1)
-		catch()
+		return true
 	}
+	return false
 }
 
-func (this *NumberInput) handleKeyUp (catch func (), key input.Key, numpad bool) {
+func (this *NumberInput) handleKeyUp (key input.Key, numpad bool) bool {
 	switch key {
-	case input.KeyUp:   catch()
+	case input.KeyUp:   return true
-	case input.KeyDown: catch()
+	case input.KeyDown: return true
 	}
+	return false
 }
 
-func (this *NumberInput) handleScroll (catch func (), x, y float64) {
+func (this *NumberInput) handleScroll (x, y float64) bool {
 	if x == 0 {
-		catch()
 		this.shift(-int(math.Round(y)))
+		return true
 	}
+	return false
 }
 
 func (this *NumberInput) handleConfirm () {

scrollbar.go

@@ -33,11 +33,9 @@ func newScrollbar (orient string) *Scrollbar {
 	}
 
 	this.Add(this.handle)
+
 	this.SetFocusable(true)
-
+	this.SetInputMask(true)
-	this.CatchDND(true)
-	this.CatchMouse(true)
-
 	this.OnKeyUp(this.handleKeyUp)
 	this.OnKeyDown(this.handleKeyDown)
 	this.OnButtonDown(this.handleButtonDown)
@@ -68,7 +66,7 @@ func (this *Scrollbar) Link (box tomo.ContentObject) event.Cookie {
 	this.layout.linked = box
 	this.linkCookie = this.newLinkCookie (
 		box.OnContentBoundsChange(this.handleLinkedContentBoundsChange))
-	this.SetLayout(this.layout)
+	this.SetAttr(tomo.ALayout(this.layout))
 	return this.linkCookie
 }
 
@@ -81,7 +79,7 @@ func (this *Scrollbar) handleLinkedContentBoundsChange () {
 	} else {
 		this.layout.value = this.layout.contentPos() / trackLength
 	}
-	this.SetLayout(this.layout)
+	this.SetAttr(tomo.ALayout(this.layout))
 	if this.layout.value != previousValue {
 		this.on.valueChange.Broadcast()
 	}
@@ -139,13 +137,17 @@ func (this *Scrollbar) StepSize () int {
 	return 16
 }
 
-func (this *Scrollbar) handleKeyUp (catch func (), key input.Key, numpad bool) {
+func (this *Scrollbar) handleKeyUp (key input.Key, numpad bool) bool {
-	catch()
+	switch key {
+	case input.KeyUp,   input.KeyLeft:  return true
+	case input.KeyDown, input.KeyRight: return true
+	case input.KeyHome: return true
+	case input.KeyEnd:  return true
+	}
+	return false
 }
 
-func (this *Scrollbar) handleKeyDown (catch func (), key input.Key, numpad bool) {
+func (this *Scrollbar) handleKeyDown (key input.Key, numpad bool) bool {
-	catch()
-	
 	var increment float64; if this.layout.vertical {
 		increment = -0.05
 	} else {
@@ -161,22 +163,25 @@ func (this *Scrollbar) handleKeyDown (catch func (), key input.Key, numpad bool)
 		} else {
 			this.SetValue(this.Value() - increment)
 		}
+		return true
 	case input.KeyDown, input.KeyRight:
 		if modifiers.Alt {
 			this.SetValue(1)
 		} else {
 			this.SetValue(this.Value() + increment)
 		}
+		return true
 	case input.KeyHome:
 		this.SetValue(0)
+		return true
 	case input.KeyEnd:
 		this.SetValue(1)
+		return true
 	}
+	return false
 }
 
-func (this *Scrollbar) handleButtonDown (catch func (), button input.Button) {
+func (this *Scrollbar) handleButtonDown (button input.Button) bool {
-	catch()
-
 	pointer := this.Window().MousePosition()
 	handle  := this.handle.Bounds()
 
@@ -213,25 +218,26 @@ func (this *Scrollbar) handleButtonDown (catch func (), button input.Button) {
 			this.scrollBy(-this.StepSize())
 		}
 	}
+	return true
 }
 
-func (this *Scrollbar) handleButtonUp (catch func (), button input.Button) {
+func (this *Scrollbar) handleButtonUp (button input.Button) bool {
-	catch()
+	if button != input.ButtonLeft || !this.dragging { return true }
-	if button != input.ButtonLeft || !this.dragging { return }
 	this.dragging = false
+	return true
 }
 
-func (this *Scrollbar) handleMouseMove () {
+func (this *Scrollbar) handleMouseMove () bool {
-	if !this.dragging { return }
+	if !this.dragging { return false }
-	this.drag()
+	return true
 }
 
-func (this *Scrollbar) handleScroll (catch func(), x, y float64) {
+func (this *Scrollbar) handleScroll (x, y float64) bool {
-	catch()
+	if this.layout.linked == nil { return false }
-	if this.layout.linked == nil { return }
 	this.layout.linked.ScrollTo (
 		this.layout.linked.ContentBounds().Min.
 		Sub(image.Pt(int(x), int(y))))
+	return true
 }
 
 func (this *Scrollbar) drag () {
@@ -289,7 +295,7 @@ func (this *scrollbarCookie) Close () {
 		cookie.Close()
 	}
 	this.owner.layout.linked = nil
-	this.owner.SetLayout(this.owner.layout)
+	this.owner.SetAttr(tomo.ALayout(this.owner.layout))
 }
 
 type scrollbarLayout struct {

scrollcontainer.go

@@ -73,7 +73,7 @@ func NewScrollContainer (sides ScrollSide) *ScrollContainer {
 	this.OnKeyUp(this.handleKeyUp)
 	this.SetRole(tomo.R("objects", "ScrollContainer"))
 	this.SetTag(sides.String(), true)
-	this.SetLayout(layouts.NewGrid(true, false)(true, false))
+	this.SetAttr(tomo.ALayout(layouts.NewGrid(true, false)(true, false)))
 	return this
 }
 
@@ -172,46 +172,46 @@ func (this *ScrollContainer) handleValueChange () {
 	this.on.valueChange.Broadcast()
 }
 
-func (this *ScrollContainer) handleScroll (catch func (), x, y float64) {
-	catch()
-	if this.root == nil { return }
-	this.scrollBy(image.Pt(int(x), int(y)))
-}
-
 func (this *ScrollContainer) scrollBy (vector image.Point) {
-	if this.root == nil { return }
+	if this.root == nil               { return }
+	if vector    == (image.Point { }) { return }
 	this.root.ScrollTo (
 		this.root.ContentBounds().Min.
 		Sub(vector))
 }
 
-func (this *ScrollContainer) handleKeyDown (catch func (), key input.Key, numpad bool) {
+func (this *ScrollContainer) handleScroll (x, y float64) bool {
+	if this.root == nil { return false }
+	this.scrollBy(image.Pt(int(x), int(y)))
+	return true
+}
+
+func (this *ScrollContainer) handleKeyDown (key input.Key, numpad bool) bool {
 	modifiers := this.Window().Modifiers()
 	vector    := image.Point { }
 	switch key {
 	case input.KeyPageUp:
-		catch()
 		if modifiers.Shift {
 			vector.X -= this.PageSize().X
 		} else {
 			vector.Y -= this.PageSize().Y
 		}
+		return true
 	case input.KeyPageDown:
-		catch()
 		if modifiers.Shift {
 			vector.X += this.PageSize().X
 		} else {
 			vector.Y += this.PageSize().Y
 		}
+		return true
 	}
-	if vector != (image.Point { }) {
+	return false
-		this.scrollBy(vector)
-	}
 }
 
-func (this *ScrollContainer) handleKeyUp (catch func (), key input.Key, numpad bool) {
+func (this *ScrollContainer) handleKeyUp (key input.Key, numpad bool) bool {
 	switch key {
-	case input.KeyPageUp:   catch()
+	case input.KeyPageUp:   return true
-	case input.KeyPageDown: catch()
+	case input.KeyPageDown: return true
 	}
+	return false
 }

slider.go

@@ -42,11 +42,9 @@ func newSlider (orient string, value float64) *Slider {
 
 	this.Add(this.handle)
 	this.SetFocusable(true)
-
-	this.CatchDND(true)
-	this.CatchMouse(true)
-
 	this.SetValue(value)
+
+	this.SetInputMask(true)
 	this.OnKeyUp(this.handleKeyUp)
 	this.OnKeyDown(this.handleKeyDown)
 	this.OnButtonDown(this.handleButtonDown)
@@ -77,7 +75,7 @@ func (this *Slider) SetValue (value float64) {
 	if value > 1 { value = 1 }
 	if value == this.layout.value { return }
 	this.layout.value = value
-	this.SetLayout(this.layout)
+	this.SetAttr(tomo.ALayout(this.layout))
 }
 
 // Value returns the value of the slider between 0 and 1.
@@ -97,9 +95,7 @@ func (this *Slider) OnConfirm (callback func ()) event.Cookie {
 	return this.on.confirm.Connect(callback)
 }
 
-func (this *Slider) handleKeyDown (catch func (), key input.Key, numpad bool) {
+func (this *Slider) handleKeyDown (key input.Key, numpad bool) bool {
-	catch()
-	
 	var increment float64; if this.layout.vertical {
 		increment = -0.05
 	} else {
@@ -114,6 +110,7 @@ func (this *Slider) handleKeyDown (catch func (), key input.Key, numpad bool) {
 			this.SetValue(this.Value() - increment)
 		}
 		this.on.valueChange.Broadcast()
+		return true
 	case input.KeyDown, input.KeyRight:
 		if this.Window().Modifiers().Alt {
 			this.SetValue(1)
@@ -121,22 +118,30 @@ func (this *Slider) handleKeyDown (catch func (), key input.Key, numpad bool) {
 			this.SetValue(this.Value() + increment)
 		}
 		this.on.valueChange.Broadcast()
+		return true
 	case input.KeyHome:
 		this.SetValue(0)
 		this.on.valueChange.Broadcast()
+		return true
 	case input.KeyEnd:
 		this.SetValue(1)
 		this.on.valueChange.Broadcast()
+		return true
 	}
+	return false
 }
 
-func (this *Slider) handleKeyUp (catch func (), key input.Key, numpad bool) {
+func (this *Slider) handleKeyUp (key input.Key, numpad bool) bool {
-	catch()
+	switch key {
+	case input.KeyUp,   input.KeyLeft:  return true
+	case input.KeyDown, input.KeyRight: return true
+	case input.KeyHome: return true
+	case input.KeyEnd:  return true
+	}
+	return false
 }
 
-func (this *Slider) handleButtonDown (catch func (), button input.Button) {
+func (this *Slider) handleButtonDown (button input.Button) bool {
-	catch()
-	
 	pointer := this.Window().MousePosition()
 	handle  := this.handle.Bounds()
 	
@@ -181,25 +186,28 @@ func (this *Slider) handleButtonDown (catch func (), button input.Button) {
 			this.on.confirm.Broadcast()
 		}
 	}
+	return true
 }
 
-func (this *Slider) handleButtonUp (catch func (), button input.Button) {
+func (this *Slider) handleButtonUp (button input.Button) bool {
-	catch()
+	if button != input.ButtonLeft || !this.dragging { return true }
-	if button != input.ButtonLeft || !this.dragging { return }
 	this.dragging = false
 	this.on.confirm.Broadcast()
+	return true
 }
 
-func (this *Slider) handleMouseMove () {
+func (this *Slider) handleMouseMove () bool {
-	if !this.dragging { return }
+	if !this.dragging { return false }
 	this.drag()
+	return true
 }
 
-func (this *Slider) handleScroll (catch func (), x, y float64) {
+func (this *Slider) handleScroll (x, y float64) bool {
 	delta := (x + y) * 0.005
 	this.SetValue(this.Value() + delta)
 	this.on.valueChange.Broadcast()
 	this.on.confirm.Broadcast()
+	return true
 }
 
 func (this *Slider) drag () {

swatch.go

@@ -30,7 +30,9 @@ func NewSwatch (value color.Color) *Swatch {
 	swatch.SetDrawer(swatch)
 	swatch.SetValue(value)
 	
+	swatch.OnButtonDown(swatch.handleButtonDown)
 	swatch.OnButtonUp(swatch.handleButtonUp)
+	swatch.OnKeyDown(swatch.handleKeyDown)
 	swatch.OnKeyUp(swatch.handleKeyUp)
 	swatch.SetFocusable(true)
 	return swatch
@@ -155,14 +157,26 @@ func (this *Swatch) userSetValue (value color.Color) {
 	this.on.valueChange.Broadcast()
 }
 
-func (this *Swatch) handleKeyUp (catch func (), key input.Key, numberPad bool) {
+func (this *Swatch) handleKeyDown (key input.Key, numberPad bool) bool {
-	if key != input.KeyEnter && key != input.Key(' ') { return }
+	if key != input.KeyEnter && key != input.Key(' ') { return false }
-	this.Choose()
+	return true
 }
 
-func (this *Swatch) handleButtonUp (catch func (), button input.Button) {
+func (this *Swatch) handleKeyUp (key input.Key, numberPad bool) bool {
-	if button != input.ButtonLeft { return }
+	if key != input.KeyEnter && key != input.Key(' ') { return false }
+	this.Choose()
+	return true
+}
+
+func (this *Swatch) handleButtonDown (button input.Button) bool {
+	if button != input.ButtonLeft { return false }
+	return true
+}
+
+func (this *Swatch) handleButtonUp (button input.Button) bool {
+	if button != input.ButtonLeft { return false }
 	if this.Window().MousePosition().In(this.Bounds()) {
 		this.Choose()
 	}
+	return true
 }

tabbedcontainer.go

@@ -19,7 +19,7 @@ func NewTabbedContainer () *TabbedContainer {
 		ContainerBox: tomo.NewContainerBox(),
 	}
 	container.SetRole(tomo.R("objects", "TabbedContainer"))
-	container.SetLayout(layouts.Column { false, true } )
+	container.SetAttr(tomo.ALayout(layouts.Column { false, true }))
 	
 	container.tabsRow = tomo.NewContainerBox()
 	container.tabsRow.SetRole(tomo.R("objects", "TabRow"))
@@ -59,9 +59,14 @@ func (this *TabbedContainer) AddTab (name string, root tomo.Object) {
 	}
 	tab.SetRole(tomo.R("objects", "Tab"))
 	tab.SetText(name)
-	tab.OnButtonDown(func (catch func (), button input.Button) {
+	tab.OnButtonDown(func (button input.Button) bool {
-		if button != input.ButtonLeft { return }
+		if button != input.ButtonLeft { return false }
 		this.Activate(name)
+		return true
+	})
+	tab.OnButtonUp(func (button input.Button) bool {
+		if button != input.ButtonLeft { return false }
+		return true
 	})
 	
 	this.tabs = append(this.tabs, tab)
@@ -102,7 +107,7 @@ func (this *TabbedContainer) ClearTabs () {
 func (this *TabbedContainer) setTabRowLayout () {
 	row := make(layouts.Row, 1 + len(this.tabs) + 1)
 	row[len(row) - 1] = true
-	this.tabsRow.SetLayout(row)
+	this.tabsRow.SetAttr(tomo.ALayout(row))
 }
 
 func (this *TabbedContainer) findTab (name string) (int, *tab) {

textinput.go

@@ -21,11 +21,12 @@ func NewTextInput (text string) *TextInput {
 	this := &TextInput { TextBox: tomo.NewTextBox() }
 	this.SetRole(tomo.R("objects", "TextInput"))
 	this.SetAttr(tomo.AAlign(tomo.AlignStart, tomo.AlignMiddle))
+	this.SetAttr(tomo.AOverflow(true, false))
 	this.SetText(text)
 	this.SetFocusable(true)
 	this.SetSelectable(true)
-	this.SetOverflow(true, false)
 	this.OnKeyDown(this.handleKeyDown)
+	this.OnKeyUp(this.handleKeyUp)
 	this.OnScroll(this.handleScroll)
 	return this
 }
@@ -53,7 +54,15 @@ func (this *TextInput) OnValueChange (callback func ()) event.Cookie {
 	return this.on.valueChange.Connect(callback)
 }
 
-func (this *TextInput) handleKeyDown (catch func (), key input.Key, numpad bool) {
+// Type types a character at the current dot position.
+func (this *TextInput) Type (char rune) {
+	dot := this.Dot()
+	this.text, dot = text.Type(this.text, dot, rune(char))
+	this.Select(dot)
+	this.SetText(string(this.text))
+}
+
+func (this *TextInput) handleKeyDown (key input.Key, numpad bool) bool {
 	dot       := this.Dot()
 	modifiers := this.Window().Modifiers()
 	word      := modifiers.Control
@@ -103,16 +112,14 @@ func (this *TextInput) handleKeyDown (catch func (), key input.Key, numpad bool)
 		this.SetText(string(this.text))
 		this.on.valueChange.Broadcast()
 	}
+	return true
 }
 
-// Type types a character at the current dot position.
+func (this *TextInput) handleKeyUp (key input.Key, numpad bool) bool {
-func (this *TextInput) Type (char rune) {
+	return true
-	dot := this.Dot()
-	this.text, dot = text.Type(this.text, dot, rune(char))
-	this.Select(dot)
-	this.SetText(string(this.text))
 }
 
-func (this *TextInput) handleScroll (catch func (), x, y float64) {
+func (this *TextInput) handleScroll (x, y float64) bool {
 	this.ScrollTo(this.ContentBounds().Min.Add(image.Pt(int(x), int(y))))
+	return true
 }

textview.go

@@ -15,12 +15,13 @@ func NewTextView (text string) *TextView {
 	this.SetFocusable(true)
 	this.SetSelectable(true)
 	this.SetText(text)
-	this.SetOverflow(false, true)
+	this.SetAttr(tomo.AOverflow(false, true))
-	this.SetWrap(true)
+	this.SetAttr(tomo.AWrap(true))
 	this.OnScroll(this.handleScroll)
 	return this
 }
 
-func (this *TextView) handleScroll (catch func (), x, y float64) {
+func (this *TextView) handleScroll (x, y float64) bool {
 	this.ScrollTo(this.ContentBounds().Min.Add(image.Pt(int(x), int(y))))
+	return true
 }