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1 | |
2 /* | |
3 * Copyright 2006 The Android Open Source Project | |
4 * | |
5 * Use of this source code is governed by a BSD-style license that can be | |
6 * found in the LICENSE file. | |
7 */ | |
8 | |
9 | |
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 | |
58 void setText(const char text[], size_t len, const SkPaint&); | |
59 void draw(SkCanvas*); | |
60 int countLines() const; | |
61 SkScalar getTextHeight() const; | |
62 | |
63 private: | |
64 SkRect fBox; | |
65 SkScalar fSpacingMul, fSpacingAdd; | |
66 uint8_t fMode, fSpacingAlign; | |
67 const char* fText; | |
68 size_t fLen; | |
69 const SkPaint* fPaint; | |
70 }; | |
71 | |
72 class SkTextLineBreaker { | |
73 public: | |
74 static int CountLines(const char text[], size_t len, const SkPaint&, SkScala
r width); | |
75 }; | |
76 | |
77 #endif | |
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