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/*
* Copyright (C) 2006 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#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 {
public:
SkTextBox();
enum Mode {
kOneLine_Mode,
kLineBreak_Mode,
kModeCount
};
Mode getMode() const { return (Mode)fMode; }
void setMode(Mode);
enum SpacingAlign {
kStart_SpacingAlign,
kCenter_SpacingAlign,
kEnd_SpacingAlign,
kSpacingAlignCount
};
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;
private:
SkRect fBox;
SkScalar fSpacingMul, fSpacingAdd;
uint8_t fMode, fSpacingAlign;
const char* fText;
size_t fLen;
const SkPaint* fPaint;
};
class SkTextLineBreaker {
public:
static int CountLines(const char text[], size_t len, const SkPaint&, SkScalar width);
};
#endif
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