From 3ddeeb546926ccc75f7a867dcbc77fcfc1ce89a3 Mon Sep 17 00:00:00 2001
From: Sasha Koshka <sashakoshka@tebibyte.media>
Date: Tue, 10 Jan 2023 21:01:30 -0500
Subject: [PATCH] You can choose whether or not you want text to wrap

---
 artist/text.go                  | 15 +++++++++++
 elements/basic/label.go         | 45 ++++++++++++++++++++++++++++-----
 examples/label/main.go          |  2 +-
 examples/verticalLayout/main.go |  4 +--
 4 files changed, 56 insertions(+), 10 deletions(-)

diff --git a/artist/text.go b/artist/text.go
index ef75143..500c552 100644
--- a/artist/text.go
+++ b/artist/text.go
@@ -137,6 +137,21 @@ func (drawer *TextDrawer) LayoutBounds () (bounds image.Rectangle) {
 	return
 }
 
+// Em returns the width of an emspace.
+func (drawer *TextDrawer) Em () (width fixed.Int26_6) {
+	if drawer.face == nil { return }
+	width, _ = drawer.face.GlyphAdvance('M')
+	return
+}
+
+// LineHeight returns the height of one line.
+func (drawer *TextDrawer) LineHeight () (height fixed.Int26_6) {
+	if drawer.face == nil { return }
+	metrics := drawer.face.Metrics()
+	height = metrics.Height
+	return
+}
+
 func (drawer *TextDrawer) recalculate () {
 	drawer.layoutClean = true
 	drawer.layout = nil
diff --git a/elements/basic/label.go b/elements/basic/label.go
index 01728ab..4a6bb04 100644
--- a/elements/basic/label.go
+++ b/elements/basic/label.go
@@ -6,28 +6,29 @@ import "git.tebibyte.media/sashakoshka/tomo/theme"
 import "git.tebibyte.media/sashakoshka/tomo/artist"
 import "git.tebibyte.media/sashakoshka/tomo/elements/core"
 
+// Label is a simple text box.
 type Label struct {
 	*core.Core
 	core core.CoreControl
-	
+
+	wrap   bool
 	text   string
 	drawer artist.TextDrawer
 }
 
-func NewLabel (text string) (element *Label) {
+// NewLabel creates a new label. If wrap is set to true, the text inside will be
+// wrapped.
+func NewLabel (text string, wrap bool) (element *Label) {
 	element = &Label {  }
 	element.Core, element.core = core.NewCore(element)
 	face := theme.FontFaceRegular()
 	element.drawer.SetFace(face)
+	element.SetWrap(wrap)
 	element.SetText(text)
-	metrics := face.Metrics()
-	emspace, _ := face.GlyphAdvance('M')
-	intEmspace := emspace.Round()
-	if intEmspace < 1 { intEmspace = theme.Padding()}
-	element.core.SetMinimumSize(intEmspace, metrics.Height.Round())
 	return
 }
 
+// Handle handles and event.
 func (element *Label) Handle (event tomo.Event) {
 	switch event.(type) {
 	case tomo.EventResize:
@@ -42,17 +43,47 @@ func (element *Label) Handle (event tomo.Event) {
 	return
 }
 
+// SetText sets the label's text.
 func (element *Label) SetText (text string) {
 	if element.text == text { return }
 
 	element.text = text
 	element.drawer.SetText(text)
+	element.updateMinimumSize()
+	
 	if element.core.HasImage () {
 		element.draw()
 		element.core.PushAll()
 	}
 }
 
+// SetWrap sets wether or not the label's text wraps. If the text is set to
+// wrap, the element will have a minimum size of a single character and
+// automatically wrap its text. If the text is set to not wrap, the element will
+// have a minimum size that fits its text.
+func (element *Label) SetWrap (wrap bool) {
+	if wrap == element.wrap { return }
+	element.wrap = wrap
+	element.updateMinimumSize()
+	
+	if element.core.HasImage () {
+		element.draw()
+		element.core.PushAll()
+	}
+}
+
+func (element *Label) updateMinimumSize () {
+	if element.wrap {
+		em := element.drawer.Em().Round()
+		if em < 1 { em = theme.Padding() }
+		element.core.SetMinimumSize (
+			em, element.drawer.LineHeight().Round())
+	} else {
+		bounds := element.drawer.LayoutBounds()
+		element.core.SetMinimumSize(bounds.Dx(), bounds.Dy())
+	}
+}
+
 func (element *Label) AdvanceSelection (direction int) (ok bool) {
 	return
 }
diff --git a/examples/label/main.go b/examples/label/main.go
index 7c6a1f8..3e5611e 100644
--- a/examples/label/main.go
+++ b/examples/label/main.go
@@ -11,7 +11,7 @@ func main () {
 func run () {
 	window, _ := tomo.NewWindow(480, 360)
 	window.SetTitle("example label")
-	window.Adopt(basic.NewLabel(text))
+	window.Adopt(basic.NewLabel(text, true))
 	window.OnClose(tomo.Stop)
 	window.Show()
 }
diff --git a/examples/verticalLayout/main.go b/examples/verticalLayout/main.go
index b111aac..01c296e 100644
--- a/examples/verticalLayout/main.go
+++ b/examples/verticalLayout/main.go
@@ -16,12 +16,12 @@ func run () {
 	container := basic.NewContainer(layouts.Vertical { true, true })
 	window.Adopt(container)
 
-	label    := basic.NewLabel("it is a label hehe")
+	label    := basic.NewLabel("it is a label hehe", false)
 	button   := basic.NewButton("drawing pad")
 	okButton := basic.NewButton("OK")
 	button.OnClick (func () {
 		container.DisownAll()
-		container.Adopt(basic.NewLabel("Draw here:"), false)
+		container.Adopt(basic.NewLabel("Draw here:", false), false)
 		container.Adopt(basic.NewTest(), true)
 		container.Adopt(okButton, false)
 	})