4 * This file is part of LyX, the document processor.
5 * Licence details can be found in the file COPYING.
10 * Full author contact details are available in file CREDITS.
18 #include "support/strfwd.h"
24 namespace graphics { class Image; }
29 * Painter - A painter class to encapsulate all graphics parameters and operations
31 * Every graphics operation in LyX should be made by this class. The
32 * painter is used for drawing on the WorkArea, and is passed around
33 * during draw operations.
35 * It hides low level windows system parameters so insets and other
36 * clients don't have to worry about them and we can control graphics and
37 * GUI toolkit dependent drawing functions inside this single class.
39 * The intention for a toolkit is that it uses these methods to paint
40 * onto a backing pixmap. Only when expose events arrive via the event
41 * queue (perhaps generated via Screen::expose), does the copy onto
42 * the actual WorkArea widget take place. Paints are wrapped in (possibly
43 * recursive) calls to start() and end() to facilitate the backing pixmap
46 * Note that the methods return *this for convenience.
48 * Caution: All char_type and docstring arguments of the text drawing
49 * methods of this class are no UCS4 chars or strings if the font is a
50 * symbol font. They simply denote the code points of the font instead.
51 * You have to keep this in mind when you implement the methods in a
52 * frontend. You must not pass these parameters to a unicode conversion
53 * function in particular.
57 Painter() : drawing_enabled_(true) {}
58 /// possible line widths
60 line_thin, //< thin line
61 line_thick //< thick line
64 /// possible line styles
66 line_solid, //< solid line
67 line_onoffdash //< dashes with spaces
70 /// possible character styles of preedit string.
71 /// This is used for CJK input method support.
73 preedit_default, //< when unselecting, no cursor and dashed underline.
74 preedit_selecting, //< when selecting.
75 preedit_cursor //< with cursor.
80 /// draw a line from point to point
81 virtual void line(int x1, int y1, int x2, int y2, Color,
82 line_style = line_solid, line_width = line_thin) = 0;
85 * lines - draw a set of lines
86 * @param xp array of points' x co-ords
87 * @param yp array of points' y co-ords
88 * @param np size of the points array
90 virtual void lines(int const * xp, int const * yp, int np, Color,
91 line_style = line_solid, line_width = line_thin) = 0;
94 virtual void rectangle(int x, int y, int w, int h, Color,
95 line_style = line_solid, line_width = line_thin) = 0;
97 /// draw a filled rectangle
98 virtual void fillRectangle(int x, int y, int w, int h, Color) = 0;
101 virtual void arc(int x, int y, unsigned int w, unsigned int h,
102 int a1, int a2, Color) = 0;
105 virtual void point(int x, int y, Color) = 0;
107 /// draw a filled rectangle with the shape of a 3D button
108 virtual void button(int x, int y, int w, int h, bool mouseHover) = 0;
110 /// draw an image from the image cache
111 virtual void image(int x, int y, int w, int h,
112 graphics::Image const & image) = 0;
114 /// draw a string at position x, y (y is the baseline)
116 * \return the width of the drawn text.
118 virtual int text(int x, int y, docstring const & str, FontInfo const & f) = 0;
120 void setDrawingEnabled(bool drawing_enabled)
121 { drawing_enabled_ = drawing_enabled; }
123 /// Indicate wether real screen drawing shall be done or not.
124 bool isDrawingEnabled() const { return drawing_enabled_; }
126 /// draw a char at position x, y (y is the baseline)
128 * \return the width of the drawn text.
130 virtual int text(int x, int y, char_type c, FontInfo const & f) = 0;
133 * Draw a string and enclose it inside a rectangle. If
134 * back color is specified, the background is cleared with
135 * the given color. If frame is specified, a thin frame is drawn
136 * around the text with the given color.
138 virtual void rectText(int x, int baseline, docstring const & str,
139 FontInfo const & font, Color back, Color frame) = 0;
141 /// draw a string and enclose it inside a button frame
142 virtual void buttonText(int x, int baseline, docstring const & s,
143 FontInfo const & font, bool mouseHover) = 0;
145 /// draw a character of a preedit string for cjk support.
146 virtual int preeditText(int x, int y,
147 char_type c, FontInfo const & f, preedit_style style) = 0;
149 /// start monochrome painting mode, i.e. map every color into [min,max]
150 virtual void enterMonochromeMode(Color const & min,
151 Color const & max) = 0;
152 /// leave monochrome painting mode
153 virtual void leaveMonochromeMode() = 0;
154 /// draws a wavy line that can be used for underlining.
155 virtual void wavyHorizontalLine(int x, int y, int width, ColorCode col) = 0;
158 bool drawing_enabled_;
161 } // namespace frontend