diff --git a/demos/presentation/progressbar.go b/demos/presentation/progressbar.go
index 7771411..a3b4bb5 100644
--- a/demos/presentation/progressbar.go
+++ b/demos/presentation/progressbar.go
@@ -13,7 +13,7 @@ func ProgressBar(nextSlide func()) (title string, content cview.Primitive) {
 
 	verticalProgressBar := cview.NewProgressBar()
 	verticalProgressBar.SetBorder(true)
-	verticalProgressBar.Vertical = true
+	verticalProgressBar.SetVertical(true)
 
 	horizontalProgressBar := cview.NewProgressBar()
 	horizontalProgressBar.SetBorder(true)
diff --git a/demos/progressbar/main.go b/demos/progressbar/main.go
index 2e15f93..ef8cc9b 100644
--- a/demos/progressbar/main.go
+++ b/demos/progressbar/main.go
@@ -15,7 +15,7 @@ func main() {
 
 	verticalProgressBar := cview.NewProgressBar()
 	verticalProgressBar.SetBorder(true)
-	verticalProgressBar.Vertical = true
+	verticalProgressBar.SetVertical(true)
 
 	horizontalProgressBar := cview.NewProgressBar()
 	horizontalProgressBar.SetBorder(true)
diff --git a/go.mod b/go.mod
index 4d06fd8..ef99982 100644
--- a/go.mod
+++ b/go.mod
@@ -5,8 +5,8 @@ go 1.12
 require (
 	github.com/gdamore/tcell v1.3.0
 	github.com/lucasb-eyer/go-colorful v1.0.3
-	github.com/mattn/go-runewidth v0.0.8
+	github.com/mattn/go-runewidth v0.0.9
 	github.com/rivo/uniseg v0.1.0
-	golang.org/x/sys v0.0.0-20200212091648-12a6c2dcc1e4 // indirect
+	golang.org/x/sys v0.0.0-20200327173247-9dae0f8f5775 // indirect
 	golang.org/x/text v0.3.2 // indirect
 )
diff --git a/go.sum b/go.sum
index d135f9b..8de7444 100644
--- a/go.sum
+++ b/go.sum
@@ -10,14 +10,14 @@ github.com/lucasb-eyer/go-colorful v1.0.3 h1:QIbQXiugsb+q10B+MI+7DI1oQLdmnep86tW
 github.com/lucasb-eyer/go-colorful v1.0.3/go.mod h1:R4dSotOR9KMtayYi1e77YzuveK+i7ruzyGqttikkLy0=
 github.com/mattn/go-runewidth v0.0.4 h1:2BvfKmzob6Bmd4YsL0zygOqfdFnK7GR4QL06Do4/p7Y=
 github.com/mattn/go-runewidth v0.0.4/go.mod h1:LwmH8dsx7+W8Uxz3IHJYH5QSwggIsqBzpuz5H//U1FU=
-github.com/mattn/go-runewidth v0.0.8 h1:3tS41NlGYSmhhe/8fhGRzc+z3AYCw1Fe1WAyLuujKs0=
-github.com/mattn/go-runewidth v0.0.8/go.mod h1:H031xJmbD/WCDINGzjvQ9THkh0rPKHF+m2gUSrubnMI=
+github.com/mattn/go-runewidth v0.0.9 h1:Lm995f3rfxdpd6TSmuVCHVb/QhupuXlYr8sCI/QdE+0=
+github.com/mattn/go-runewidth v0.0.9/go.mod h1:H031xJmbD/WCDINGzjvQ9THkh0rPKHF+m2gUSrubnMI=
 github.com/rivo/uniseg v0.1.0 h1:+2KBaVoUmb9XzDsrx/Ct0W/EYOSFf/nWTauy++DprtY=
 github.com/rivo/uniseg v0.1.0/go.mod h1:J6wj4VEh+S6ZtnVlnTBMWIodfgj8LQOQFoIToxlJtxc=
 golang.org/x/sys v0.0.0-20190626150813-e07cf5db2756 h1:9nuHUbU8dRnRRfj9KjWUVrJeoexdbeMjttk6Oh1rD10=
 golang.org/x/sys v0.0.0-20190626150813-e07cf5db2756/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20200212091648-12a6c2dcc1e4 h1:sfkvUWPNGwSV+8/fNqctR5lS2AqCSqYwXdrjCxp/dXo=
-golang.org/x/sys v0.0.0-20200212091648-12a6c2dcc1e4/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20200327173247-9dae0f8f5775 h1:TC0v2RSO1u2kn1ZugjrFXkRZAEaqMN/RW+OTZkBzmLE=
+golang.org/x/sys v0.0.0-20200327173247-9dae0f8f5775/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/text v0.3.0 h1:g61tztE5qeGQ89tm6NTjjM9VPIm088od1l6aSorWRWg=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.2 h1:tW2bmiBqwgJj/UpqtC8EpXEZVYOwU0yG4iWbprSVAcs=
diff --git a/progressbar.go b/progressbar.go
index c92e7a8..f55cd51 100644
--- a/progressbar.go
+++ b/progressbar.go
@@ -12,24 +12,27 @@ type ProgressBar struct {
 	*Box
 
 	// Rune to use when rendering the empty area of the progress bar.
-	EmptyRune rune
+	emptyRune rune
 
 	// Color of the empty area of the progress bar.
-	EmptyColor tcell.Color
+	emptyColor tcell.Color
 
 	// Rune to use when rendering the filled area of the progress bar.
-	FilledRune rune
+	filledRune rune
 
 	// Color of the filled area of the progress bar.
-	FilledColor tcell.Color
+	filledColor tcell.Color
 
 	// If set to true, instead of filling from left to right, the bar is filled
 	// from bottom to top.
-	Vertical bool
+	vertical bool
 
-	max      int
+	// Current progress.
 	progress int
 
+	// Progress required to fill the bar.
+	max int
+
 	sync.Mutex
 }
 
@@ -37,14 +40,54 @@ type ProgressBar struct {
 func NewProgressBar() *ProgressBar {
 	return &ProgressBar{
 		Box:         NewBox().SetBackgroundColor(Styles.PrimitiveBackgroundColor),
-		EmptyRune:   ' ',
-		EmptyColor:  Styles.PrimitiveBackgroundColor,
-		FilledRune:  tcell.RuneBlock,
-		FilledColor: Styles.PrimaryTextColor,
+		emptyRune:   ' ',
+		emptyColor:  Styles.PrimitiveBackgroundColor,
+		filledRune:  tcell.RuneBlock,
+		filledColor: Styles.PrimaryTextColor,
 		max:         100,
 	}
 }
 
+// SetEmptyRune sets the rune used for the empty area of the progress bar.
+func (p *ProgressBar) SetEmptyRune(empty rune) {
+	p.Lock()
+	defer p.Unlock()
+
+	p.emptyRune = empty
+}
+
+// SetEmptyColor sets the color of the empty area of the progress bar.
+func (p *ProgressBar) SetEmptyColor(empty tcell.Color) {
+	p.Lock()
+	defer p.Unlock()
+
+	p.emptyColor = empty
+}
+
+// SetFilledRune sets the rune used for the filled area of the progress bar.
+func (p *ProgressBar) SetFilledRune(filled rune) {
+	p.Lock()
+	defer p.Unlock()
+
+	p.filledRune = filled
+}
+
+// SetFilledColor sets the color of the filled area of the progress bar.
+func (p *ProgressBar) SetFilledColor(filled tcell.Color) {
+	p.Lock()
+	defer p.Unlock()
+
+	p.filledColor = filled
+}
+
+// SetVertical sets the direction of the progress bar.
+func (p *ProgressBar) SetVertical(vertical bool) {
+	p.Lock()
+	defer p.Unlock()
+
+	p.vertical = vertical
+}
+
 // SetMax sets the progress required to fill the bar.
 func (p *ProgressBar) SetMax(max int) {
 	p.Lock()
@@ -104,7 +147,7 @@ func (p *ProgressBar) Draw(screen tcell.Screen) {
 
 	barSize := height
 	maxLength := width
-	if p.Vertical {
+	if p.vertical {
 		barSize = width
 		maxLength = height
 	}
@@ -116,17 +159,17 @@ func (p *ProgressBar) Draw(screen tcell.Screen) {
 
 	for i := 0; i < barSize; i++ {
 		for j := 0; j < barLength; j++ {
-			if p.Vertical {
-				screen.SetContent(x+i, y+(height-1-j), p.FilledRune, nil, tcell.StyleDefault.Foreground(p.FilledColor).Background(p.backgroundColor))
+			if p.vertical {
+				screen.SetContent(x+i, y+(height-1-j), p.filledRune, nil, tcell.StyleDefault.Foreground(p.filledColor).Background(p.backgroundColor))
 			} else {
-				screen.SetContent(x+j, y+i, p.FilledRune, nil, tcell.StyleDefault.Foreground(p.FilledColor).Background(p.backgroundColor))
+				screen.SetContent(x+j, y+i, p.filledRune, nil, tcell.StyleDefault.Foreground(p.filledColor).Background(p.backgroundColor))
 			}
 		}
 		for j := barLength; j < maxLength; j++ {
-			if p.Vertical {
-				screen.SetContent(x+i, y+(height-1-j), p.EmptyRune, nil, tcell.StyleDefault.Foreground(p.EmptyColor).Background(p.backgroundColor))
+			if p.vertical {
+				screen.SetContent(x+i, y+(height-1-j), p.emptyRune, nil, tcell.StyleDefault.Foreground(p.emptyColor).Background(p.backgroundColor))
 			} else {
-				screen.SetContent(x+j, y+i, p.EmptyRune, nil, tcell.StyleDefault.Foreground(p.EmptyColor).Background(p.backgroundColor))
+				screen.SetContent(x+j, y+i, p.emptyRune, nil, tcell.StyleDefault.Foreground(p.emptyColor).Background(p.backgroundColor))
 			}
 		}
 	}
diff --git a/textview.go b/textview.go
index d2236b5..ae8e1cb 100644
--- a/textview.go
+++ b/textview.go
@@ -2,7 +2,6 @@ package cview
 
 import (
 	"bytes"
-	"fmt"
 	"regexp"
 	"strings"
 	"sync"
@@ -90,7 +89,6 @@ type textViewIndex struct {
 //
 // See https://gitlab.com/tslocum/cview/wiki/TextView for an example.
 type TextView struct {
-	sync.RWMutex
 	*Box
 
 	// The text buffer.
@@ -170,6 +168,8 @@ type TextView struct {
 	// An optional function which is called when the user presses one of the
 	// following keys: Escape, Enter, Tab, Backtab.
 	done func(tcell.Key)
+
+	sync.RWMutex
 }
 
 // NewTextView returns a new text view.
@@ -258,8 +258,11 @@ func (t *TextView) SetTextColor(color tcell.Color) *TextView {
 // SetText sets the text of this text view to the provided string. Previously
 // contained text will be removed.
 func (t *TextView) SetText(text string) *TextView {
-	t.Clear()
-	fmt.Fprint(t, text)
+	t.Lock()
+	defer t.Unlock()
+
+	t.clear()
+	t.write([]byte(text))
 	return t
 }
 
@@ -413,6 +416,10 @@ func (t *TextView) Clear() *TextView {
 	t.Lock()
 	defer t.Unlock()
 
+	return t.clear()
+}
+
+func (t *TextView) clear() *TextView {
 	t.buffer = nil
 	t.recentBytes = nil
 	t.index = nil
@@ -580,6 +587,10 @@ func (t *TextView) Write(p []byte) (n int, err error) {
 	}
 	defer t.Unlock()
 
+	return t.write(p)
+}
+
+func (t *TextView) write(p []byte) (n int, err error) {
 	// Copy data over.
 	newBytes := append(t.recentBytes, p...)
 	t.recentBytes = nil