* added helper method MaxWidth() to BTextView::LineBuffer

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@33702 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/kits/interface/textview_support/LineBuffer.cpp

@@ -105,3 +105,20 @@ BTextView::LineBuffer::BumpOffset(int32 delta, int32 index)
 	for (long i = index; i < fItemCount; i++)
 		fBuffer[i].offset += delta;
 }
+
+
+float
+BTextView::LineBuffer::MaxWidth() const
+{
+	if (fItemCount == 0)
+		return 0;
+
+	float maxWidth = 0;
+	STELine* line = &fBuffer[0];
+	for (int32 i = 0; i < fItemCount; i++) {
+		if (maxWidth < line->width)
+			maxWidth = line->width;
+		line++;
+	}
+	return maxWidth;
+}

src/kits/interface/textview_support/LineBuffer.h

@@ -15,7 +15,7 @@ struct STELine {
 	long		offset;		// offset of first character of line
 	float		origin;		// pixel position of top of line
 	float		ascent;		// maximum ascent for line
-	float		width;		// not used for now, but could be
+	float		width;		// cached width of line in pixels
 };
 
 
@@ -36,6 +36,7 @@ virtual					~LineBuffer();
 		void			BumpOffset(int32 delta, int32 index);
 
 		long			NumLines() const;
+		float			MaxWidth() const;
 		STELine *		operator[](int32 index) const;
 };