epoger@google.com | ec3ed6a | 2011-07-28 14:26:00 +0000 | [diff] [blame] | 1 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 2 | /* |
epoger@google.com | ec3ed6a | 2011-07-28 14:26:00 +0000 | [diff] [blame] | 3 | * Copyright 2006 The Android Open Source Project |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 4 | * |
epoger@google.com | ec3ed6a | 2011-07-28 14:26:00 +0000 | [diff] [blame] | 5 | * Use of this source code is governed by a BSD-style license that can be |
| 6 | * found in the LICENSE file. |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 7 | */ |
| 8 | |
epoger@google.com | ec3ed6a | 2011-07-28 14:26:00 +0000 | [diff] [blame] | 9 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 10 | #ifndef SkTextBox_DEFINED |
| 11 | #define SkTextBox_DEFINED |
| 12 | |
| 13 | #include "SkCanvas.h" |
| 14 | |
| 15 | /** \class SkTextBox |
| 16 | |
| 17 | SkTextBox is a helper class for drawing 1 or more lines of text |
| 18 | within a rectangle. The textbox is positioned and clipped by its Frame. |
| 19 | The Margin rectangle controls where the text is drawn relative to |
| 20 | the Frame. Line-breaks occur inside the Margin rectangle. |
| 21 | |
| 22 | Spacing is a linear equation used to compute the distance between lines |
| 23 | of text. Spacing consists of two scalars: mul and add, and the spacing |
| 24 | between lines is computed as: spacing = paint.getTextSize() * mul + add |
| 25 | */ |
| 26 | class SkTextBox { |
| 27 | public: |
| 28 | SkTextBox(); |
| 29 | |
| 30 | enum Mode { |
| 31 | kOneLine_Mode, |
| 32 | kLineBreak_Mode, |
| 33 | |
| 34 | kModeCount |
| 35 | }; |
| 36 | Mode getMode() const { return (Mode)fMode; } |
| 37 | void setMode(Mode); |
| 38 | |
| 39 | enum SpacingAlign { |
| 40 | kStart_SpacingAlign, |
| 41 | kCenter_SpacingAlign, |
| 42 | kEnd_SpacingAlign, |
| 43 | |
| 44 | kSpacingAlignCount |
| 45 | }; |
| 46 | SpacingAlign getSpacingAlign() const { return (SpacingAlign)fSpacingAlign; } |
| 47 | void setSpacingAlign(SpacingAlign); |
| 48 | |
| 49 | void getBox(SkRect*) const; |
| 50 | void setBox(const SkRect&); |
| 51 | void setBox(SkScalar left, SkScalar top, SkScalar right, SkScalar bottom); |
| 52 | |
| 53 | void getSpacing(SkScalar* mul, SkScalar* add) const; |
| 54 | void setSpacing(SkScalar mul, SkScalar add); |
| 55 | |
| 56 | void draw(SkCanvas*, const char text[], size_t len, const SkPaint&); |
| 57 | |
reed@android.com | 033e03c | 2010-05-18 21:17:43 +0000 | [diff] [blame] | 58 | void setText(const char text[], size_t len, const SkPaint&); |
| 59 | void draw(SkCanvas*); |
| 60 | int countLines() const; |
| 61 | SkScalar getTextHeight() const; |
| 62 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 63 | private: |
| 64 | SkRect fBox; |
| 65 | SkScalar fSpacingMul, fSpacingAdd; |
| 66 | uint8_t fMode, fSpacingAlign; |
reed@android.com | 033e03c | 2010-05-18 21:17:43 +0000 | [diff] [blame] | 67 | const char* fText; |
| 68 | size_t fLen; |
| 69 | const SkPaint* fPaint; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 70 | }; |
| 71 | |
| 72 | class SkTextLineBreaker { |
| 73 | public: |
| 74 | static int CountLines(const char text[], size_t len, const SkPaint&, SkScalar width); |
| 75 | }; |
| 76 | |
| 77 | #endif |