anchovy.gui.utils.textline source code

1 /**
2 Copyright: Copyright (c) 2013-2014 Andrey Penechko.
3 License: a$(WEB boost.org/LICENSE_1_0.txt, Boost License 1.0).
4 Authors: Andrey Penechko.
5 */
6 
7 module anchovy.gui.utils.textline;
8 
9 import anchovy.gui;
10 public import anchovy.graphics.texrectarray;
11 import anchovy.graphics.interfaces.irenderer;
12 import anchovy.graphics.font.fontmanager;
13 
14 class TextLine
15 {
16 
17 public:
18 
19 	this()
20 	{
21 		_text = "";
22 	}
23 
24 	void font(Font newFont) @property
25 	{
26 		if (newFont is null) return;
27 		_font = newFont;
28 		if (!_isInited || newFont != _font)
29 			init();
30 	}
31 
32 	Font font() @property
33 	{
34 		return _font;
35 	}
36 
37 	bool isInited() @property
38 	{
39 		return _isInited;
40 	}
41 	
42 	void update()
43 	{
44 		if (text.length == 0 || !_isInited) return;
45 		if (_isDirty)
46 		{
47 			_geometry.load;
48 			_isDirty = false;
49 		}
50 	}
51 
52 	uint width() @property
53 	{
54 		return _width;
55 	}
56 
57 	uint height() @property
58 	{
59 		return _height;
60 	}
61 
62 	ivec2 size() @property
63 	{
64 		return ivec2(_width, _height);
65 	}
66 
67 	TexRectArray geometry() @property
68 	{
69 		return _geometry;
70 	}
71 
72 	dstring text() @property
73 	{
74 		return _text;
75 	}
76 
77 	dstring text(in dstring newText) @property
78 	{
79 		if (_text == newText)
80 		{
81 			return _text;
82 		}
83 
84 		_text = newText;
85 		if (!_isInited) return _text;
86 
87 		_geometry.vertieces = null;
88 		_cursorX = 0;
89 		
90 		appendGlyphs(_text, _font);
91 		_isDirty = true;
92 
93 		return _text;
94 	}
95 
96 	string fontName() @property
97 	{
98 		return _fontName;
99 	}
100 
101 	void fontName(string newFontName) @property
102 	{
103 		_fontName = newFontName;
104 	}
105 
106 	///Supports chaining
107 	TextLine append(in string text)
108 	{
109 		return append(to!dstring(text));
110 	}
111 
112 	TextLine append(in dstring text)
113 	{
114 		appendGlyphs(_text, _font);
115 		_isDirty = true;
116 		return this;
117 	}
118 
119 protected:
120 
121 	void init()
122 	{
123 		_geometry = new TexRectArray;
124 		_height = _font.size;
125 		appendGlyphs(_text, _font);
126 		_isInited = true;
127 	}
128 
129 	void appendGlyphs(in dstring text, Font font)
130 	{
131 		foreach(dchar chr; text)
132 		{
133 			Glyph* glyph = font.getGlyph(chr);
134 			if (glyph !is null && chr == '\t')
135 			{
136 				_cursorX += glyph.metrics.advanceX * _tabSize;
137 				continue;
138 			}
139 			if (glyph is null) glyph = font.getGlyph('?');
140 			
141 			int x  =  glyph.metrics.offsetX + _cursorX;
142 			int y  =  font.verticalOffset - glyph.metrics.offsetY;
143 			int w  =  glyph.metrics.width;
144 			int h  =  glyph.metrics.height;
145 			int tx =  glyph.atlasPosition.x;
146 			int ty =  glyph.atlasPosition.y;
147 			
148 			//whitespace
149 			if (w == 0 || h == 0)
150 			{
151 				_cursorX += glyph.metrics.advanceX;
152 				continue;
153 			}
154 
155 			_geometry.appendQuad(Rect(x, y, w, h), Rect(tx, ty, w, h));
156 			_cursorX += glyph.metrics.advanceX;
157 		}
158 
159 		_width = _cursorX;
160 	}
161 
162 protected:
163 	uint _width;
164 	uint _height;
165 	dstring _text;
166 	bool _isInited = false;
167 	
168 	TexRectArray _geometry;
169 	uint _cursorX;
170 	bool _isDirty = true;
171 	
172 	Font _font;
173 	string _fontName;
174 	
175 	ubyte _tabSize = 4;
176 }