Added a list example

artist/line.go

@@ -123,6 +123,8 @@ func abs (in int) (out int) {
 	return
 }
 
+// TODO: this method of doing things sucks and can cause a segfault. we should
+// not be doing it this way
 func squareAround (
 	data   []color.RGBA,
 	stride int,

elements/basic/list.go

@@ -359,6 +359,9 @@ func (element *List) selectUnderMouse (x, y int) (updated bool) {
 	if element.onSelectedEntryChange != nil {
 		element.onSelectedEntryChange(element.selectedEntry)
 	}
+	if element.selectedEntry >= 0 {
+		element.entries[element.selectedEntry].RunSelect()
+	}
 	return true
 }
 

elements/basic/listentry.go

@@ -12,13 +12,13 @@ type ListEntry struct {
 	textPoint image.Point
 	text string
 	forcedMinimumWidth int
-	onClick func ()
+	onSelect func ()
 }
 
-func NewListEntry (text string, onClick func ()) (entry ListEntry) {
+func NewListEntry (text string, onSelect func ()) (entry ListEntry) {
 	entry = ListEntry  {
 		text:     text,
-		onClick: onClick,
+		onSelect: onSelect,
 	}
 	entry.drawer.SetText([]rune(text))
 	entry.drawer.SetFace(theme.FontFaceRegular())
@@ -62,6 +62,12 @@ func (entry *ListEntry) Draw (
 		offset.Add(entry.textPoint))
 }
 
+func (entry *ListEntry) RunSelect () {
+	if entry.onSelect != nil {
+		entry.onSelect()
+	}
+}
+
 func (entry *ListEntry) Bounds () (bounds image.Rectangle) {
 	return entry.bounds
 }

elements/testing/mouse.go

@@ -28,22 +28,23 @@ func NewMouse () (element *Mouse) {
 
 func (element *Mouse) Resize (width, height int) {
 	element.core.AllocateCanvas(width, height)
+	bounds := element.Bounds()
 	artist.FillRectangle (
 		element.core,
 		theme.AccentPattern(),
-		element.Bounds())
+		bounds)
 	artist.StrokeRectangle (
 		element.core,
 		artist.NewUniform(color.Black), 1,
-		element.Bounds())
-	artist.Line (
-		element.core, artist.NewUniform(color.White), 3,
-		image.Pt(1, 1),
-		image.Pt(width - 2, height - 2))
+		bounds)
 	artist.Line (
 		element.core, artist.NewUniform(color.White), 1,
-		image.Pt(1, height - 2),
-		image.Pt(width - 2, 1))
+		image.Pt(1, 1),
+		image.Pt(bounds.Dx() - 2, bounds.Dy() - 2))
+	artist.Line (
+		element.core, artist.NewUniform(color.White), 1,
+		image.Pt(1, bounds.Dy() - 2),
+		image.Pt(bounds.Dx() - 2, 1))
 }
 
 func (element *Mouse) HandleMouseDown (x, y int, button tomo.Button) {

examples/list/main.go

@@ -0,0 +1,59 @@
+package main
+
+import "git.tebibyte.media/sashakoshka/tomo"
+import "git.tebibyte.media/sashakoshka/tomo/popups"
+import "git.tebibyte.media/sashakoshka/tomo/layouts"
+import "git.tebibyte.media/sashakoshka/tomo/elements/basic"
+import "git.tebibyte.media/sashakoshka/tomo/elements/testing"
+import _ "git.tebibyte.media/sashakoshka/tomo/backends/x"
+
+func main () {
+	tomo.Run(run)
+}
+
+func run () {
+	window, _ := tomo.NewWindow(300, 2)
+	window.SetTitle("List Sidebar")
+
+	container := basic.NewContainer(layouts.Horizontal { true, true })
+	window.Adopt(container)
+
+	var currentPage tomo.Element
+	turnPage := func (newPage tomo.Element) {
+		container.Warp (func () {
+			if currentPage != nil {
+				container.Disown(currentPage)
+			}
+			container.Adopt(newPage, true)
+			currentPage = newPage
+		})
+	}
+
+	button := basic.NewButton("I do nothing!")
+	button.OnClick (func () {
+		popups.NewDialog(popups.DialogKindInfo, "", "Sike!")
+	})
+	mouse  := testing.NewMouse()
+	input  := basic.NewTextBox("Write some text", "")
+	form := basic.NewContainer(layouts.Vertical { true, false})
+		form.Adopt(basic.NewLabel("I have:", false), false)
+		form.Adopt(basic.NewSpacer(true), false)
+		form.Adopt(basic.NewCheckbox("Skin", true), false)
+		form.Adopt(basic.NewCheckbox("Blood", false), false)
+		form.Adopt(basic.NewCheckbox("Bone", false), false)
+
+	list := basic.NewList (
+		basic.NewListEntry("button", func () { turnPage(button) }),
+		basic.NewListEntry("mouse",  func () { turnPage(mouse) }),
+		basic.NewListEntry("input",  func () { turnPage(input) }),
+		basic.NewListEntry("form",   func () { turnPage(form) }))
+	list.Collapse(96, 0)
+	
+	container.Adopt(list, false)
+	turnPage (basic.NewLabel (
+		"The List element can be easily used as a sidebar. " +
+		"Click on entries to flip pages!", true))
+	
+	window.OnClose(tomo.Stop)
+	window.Show()
+}