Add: status page screen change support

components/text.go

@@ -50,7 +50,6 @@ func (t *text) Clear() {
 }
 
 func (t *text) Draw() {
-	t.Clear() // Assume that is draw is invoked string has been changed
 	t.drawer.PutText(t.rect.x, t.rect.y, t.str)
 	t.drawer.GetDisplay().FlushByMask(t.mask.bits)
 }
@@ -61,9 +60,18 @@ func (t *text) updateW() {
 
 func (t *text) SetStr(str string) {
 	t.str = str
-	t.updateW()
-	t.mask.Update(t.rect)
+	newW := len(t.str)*(drawer.FontCharW+drawer.CharGap) - drawer.CharGap
+	if t.rect.w-newW > 0 {
+		// Need to clear some space
+		t.Clear()
+		t.drawer.FillBar(t.rect.x+newW, t.rect.y, t.rect.x+t.rect.w, t.rect.y+t.rect.h, 0)
+	} else {
+		t.rect.w = newW
+		t.mask.Update(t.rect)
+	}
 	t.Draw()
+	t.rect.w = newW
+	t.mask.Update(t.rect)
 }
 
 func (t *text) GetPos() (int, int) {