add text label widget

1 files changed, 16 insertions, 7 deletions

diff --git a/gui/widget/text.go b/gui/widget/text.go
index 4723eda..5e37d70 100644
--- a/gui/widget/text.go
+++ b/gui/widget/text.go
@@ -14,11 +14,12 @@ import (
 )
 
 var (
-	FONT               = goregular.TTF
-	FONT_SIZE  float64 = 15
-	DPI        float64 = 72
-	BG_COLOR           = image.White
-	TEXT_COLOR         = image.Black
+	FONT       = goregular.TTF
+	FONT_SIZE  = 15
+	DPI        = 72
+	PADDING    = 3
+	BG_COLOR   = image.White
+	TEXT_COLOR = image.Black
 )
 
 var face *concurrentFace
@@ -29,8 +30,8 @@ func init() {
 		log.Fatal(err)
 	}
 	fce, err := opentype.NewFace(fnt, &opentype.FaceOptions{
-		Size: FONT_SIZE,
-		DPI:  DPI,
+		Size: float64(FONT_SIZE),
+		DPI:  float64(DPI),
 	})
 	if err != nil {
 		log.Fatal(err)
@@ -38,6 +39,14 @@ func init() {
 	face = &concurrentFace{sync.Mutex{}, fce}
 }
 
+func TextWidth(nchars int) int {
+	return nchars*FONT_SIZE + 2*PADDING // very rough estimation
+}
+
+func TextHeight() int {
+	return FONT_SIZE + 2*PADDING
+}
+
 func drawText(text []byte, dst draw.Image, r image.Rectangle) {
 	drawer := font.Drawer{
 		Src:  TEXT_COLOR,