Added untested label collapse

elements/basic/label.go

@@ -1,5 +1,6 @@
 package basicElements
 
+import "golang.org/x/image/math/fixed"
 import "git.tebibyte.media/sashakoshka/tomo/theme"
 import "git.tebibyte.media/sashakoshka/tomo/config"
 import "git.tebibyte.media/sashakoshka/tomo/textdraw"
@@ -14,6 +15,9 @@ type Label struct {
 	text   string
 	drawer textdraw.Drawer
 
+	forcedColumns int
+	forcedRows    int
+	
 	config config.Wrapped
 	theme  theme.Wrapped
 	
@@ -56,6 +60,17 @@ func (element *Label) handleResize () {
 	return
 }
 
+// EmCollapse forces a minimum width and height upon the label. The width is
+// measured in emspaces, and the height is measured in lines. If a zero value is
+// given for a dimension, its minimum will be determined by the label's content.
+// If the label's content is greater than these dimensions, it will be truncated
+// to fit.
+func (element *Label) EmCollapse (columns int, rows int) {
+	element.forcedColumns = columns
+	element.forcedRows    = rows
+	element.updateMinimumSize()
+}
+
 // FlexibleHeightFor returns the reccomended height for this element based on
 // the given width in order to allow the text to wrap properly.
 func (element *Label) FlexibleHeightFor (width int) (height int) {
@@ -134,20 +149,35 @@ func (element *Label) SetConfig (new config.Config) {
 }
 
 func (element *Label) updateMinimumSize () {
+	var width, height int
+	
 	if element.wrap {
 		em := element.drawer.Em().Round()
 		if em < 1 {
 			em = element.theme.Padding(theme.PatternBackground)[0]
 		}
-		element.core.SetMinimumSize (
-			em, element.drawer.LineHeight().Round())
+		width, height = em, element.drawer.LineHeight().Round()
 		if element.onFlexibleHeightChange != nil {
 			element.onFlexibleHeightChange()
 		}
 	} else {
 		bounds := element.drawer.LayoutBounds()
-		element.core.SetMinimumSize(bounds.Dx(), bounds.Dy())
+		width, height = bounds.Dx(), bounds.Dy()
 	}
+
+	if element.forcedColumns > 0 {
+		width = int (
+			element.drawer.Em().
+			Mul(fixed.I(element.forcedColumns)))
+	}
+
+	if element.forcedRows > 0 {
+		height = int (
+			element.drawer.LineHeight().
+			Mul(fixed.I(element.forcedRows)))
+	}
+
+	element.core.SetMinimumSize(width, height)
 }
 
 func (element *Label) draw () {
@@ -160,7 +190,7 @@ func (element *Label) draw () {
 
 	textBounds := element.drawer.LayoutBounds()
 
-	foreground :=  element.theme.Color (
+	foreground := element.theme.Color (
 		theme.ColorForeground,
 		theme.State { })
 	element.drawer.Draw(element.core, foreground, bounds.Min.Sub(textBounds.Min))

examples/documentContainer/main.go

@@ -4,6 +4,7 @@ import "os"
 import "image"
 import _ "image/png"
 import "git.tebibyte.media/sashakoshka/tomo"
+import "git.tebibyte.media/sashakoshka/tomo/layouts/basic"
 import "git.tebibyte.media/sashakoshka/tomo/elements/basic"
 import _ "git.tebibyte.media/sashakoshka/tomo/backends/x"
 
@@ -44,6 +45,17 @@ func run () {
 		"lay out a settings menu with descriptive label text between " +
 		"control groups like in iOS, or list comment or chat histories.", true))
 	document.Adopt(basicElements.NewImage(logo))
+	document.Adopt (basicElements.NewLabel (
+		"Oh, you're a switch? Then name all of these switches:", true))
+	for i := 0; i < 3; i ++ {
+		switchContainer := basicElements.NewContainer (basicLayouts.Horizontal {
+			Gap: true,
+		})
+		for i := 0; i < 10; i ++ {
+			switchContainer.Adopt(basicElements.NewSwitch("", false), true)
+		}
+		document.Adopt(switchContainer)
+	}
 
 	scrollContainer.Adopt(document)
 	window.Adopt(scrollContainer)