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* Copyright 2006 The Android Open Source Project
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
#ifndef SkTextBox_DEFINED
#define SkTextBox_DEFINED
#include "SkCanvas.h"
/** \class SkTextBox
SkTextBox is a helper class for drawing 1 or more lines of text
within a rectangle. The textbox is positioned and clipped by its Frame.
The Margin rectangle controls where the text is drawn relative to
the Frame. Line-breaks occur inside the Margin rectangle.
Spacing is a linear equation used to compute the distance between lines
of text. Spacing consists of two scalars: mul and add, and the spacing
between lines is computed as: spacing = paint.getTextSize() * mul + add
class SkTextBox {
enum Mode {
Mode getMode() const { return (Mode)fMode; }
void setMode(Mode);
enum SpacingAlign {
SpacingAlign getSpacingAlign() const { return (SpacingAlign)fSpacingAlign; }
void setSpacingAlign(SpacingAlign);
void getBox(SkRect*) const;
void setBox(const SkRect&);
void setBox(SkScalar left, SkScalar top, SkScalar right, SkScalar bottom);
void getSpacing(SkScalar* mul, SkScalar* add) const;
void setSpacing(SkScalar mul, SkScalar add);
void draw(SkCanvas*, const char text[], size_t len, const SkPaint&);
void setText(const char text[], size_t len, const SkPaint&);
void draw(SkCanvas*);
int countLines() const;
SkScalar getTextHeight() const;
SkTextBlob* snapshotTextBlob(SkScalar* computedBottom) const;
class Visitor {
virtual ~Visitor() {}
virtual void operator()(const char*, size_t, SkScalar x, SkScalar y, const SkPaint&) = 0;
SkRect fBox;
SkScalar fSpacingMul, fSpacingAdd;
uint8_t fMode, fSpacingAlign;
const char* fText;
size_t fLen;
const SkPaint* fPaint;
SkScalar visit(Visitor&, const char text[], size_t len, const SkPaint&) const;
class SkTextLineBreaker {
static int CountLines(const char text[], size_t len, const SkPaint&, SkScalar width);