Text class. More...
#include <text.hpp>
Public Types | |
enum | FONT_STYLE { STYLE_NORMAL = 0, STYLE_BOLD = 1, STYLE_ITALIC = 2, STYLE_UNDERLINE = 4 } |
Public Member Functions | |
pango_text () | |
pango_text (const pango_text &)=delete | |
pango_text & | operator= (const pango_text &)=delete |
texture | render_and_get_texture () |
Returns the cached texture, or creates a new one otherwise. More... | |
texture | render_texture (const SDL_Rect &viewport) |
Returns the rendered text as a texture. More... | |
surface | render_surface (const SDL_Rect &viewport) |
Returns the rendered text. More... | |
surface | render_surface () |
Equivalent to render(viewport), where the viewport's top-left is at (0,0) and the area is large enough to contain the full text. More... | |
point | get_size () |
Returns the size of the text, in drawing coordinates. More... | |
bool | is_truncated () const |
Has the text been truncated? This happens if it exceeds max width or height. More... | |
unsigned | insert_text (const unsigned offset, const std::string &text) |
Inserts UTF-8 text. More... | |
int | get_max_glyph_height () const |
Returns the maximum glyph height of a font, in drawing coordinates. More... | |
point | get_cursor_position (const unsigned column, const unsigned line=0) const |
Gets the location for the cursor, in drawing coordinates. More... | |
std::size_t | get_maximum_length () const |
Get maximum length. More... | |
std::string | get_token (const point &position, const char *delimiters=" \\) const |
Gets the largest collection of characters, including the token at position, and not including any characters from the delimiters set. More... | |
std::string | get_link (const point &position) const |
Checks if position points to a character in a link in the text, returns it if so, empty string otherwise. More... | |
point | get_column_line (const point &position) const |
Gets the column of line of the character at the position. More... | |
std::vector< std::string > | get_lines () const |
Retrieves a list of strings with contents for each rendered line. More... | |
std::size_t | get_length () const |
Gets the length of the text in bytes. More... | |
bool | set_text (const std::string &text, const bool markedup) |
Sets the text to render. More... | |
const std::string & | text () const |
pango_text & | set_family_class (font::family_class fclass) |
pango_text & | set_font_size (unsigned font_size) |
pango_text & | set_font_style (const FONT_STYLE font_style) |
pango_text & | set_foreground_color (const color_t &color) |
pango_text & | set_maximum_width (int width) |
pango_text & | set_characters_per_line (const unsigned characters_per_line) |
pango_text & | set_maximum_height (int height, bool multiline) |
pango_text & | set_ellipse_mode (const PangoEllipsizeMode ellipse_mode) |
pango_text & | set_alignment (const PangoAlignment alignment) |
pango_text & | set_maximum_length (const std::size_t maximum_length) |
bool | link_aware () const |
pango_text & | set_link_aware (bool b) |
pango_text & | set_link_color (const color_t &color) |
pango_text & | set_add_outline (bool do_add) |
Private Member Functions | |
void | recalculate () const |
Recalculates the text layout. More... | |
PangoRectangle | calculate_size (PangoLayout &layout) const |
Calculates surface size. More... | |
surface | create_surface () |
Renders the text to a surface. More... | |
surface | create_surface (const SDL_Rect &viewport) |
void | render (PangoLayout &layout, const SDL_Rect &viewport, const unsigned stride) |
bool | set_markup (std::string_view text, PangoLayout &layout) |
Sets the markup'ed text. More... | |
bool | validate_markup (std::string_view text, char **raw_text, std::string &semi_escaped) const |
std::string | format_links (std::string_view text) const |
Replaces all instances of URLs in a given string with formatted links and returns the result. More... | |
texture | with_draw_scale (const texture &t) const |
Adjust a texture's draw-width and height according to pixel scale. More... | |
int | to_draw_scale (int s) const |
Scale the given render-space size to draw-space, rounding up. More... | |
point | to_draw_scale (const point &p) const |
Scale the given render-space point to draw-space, rounding up. More... | |
void | update_pixel_scale () |
Update pixel scale, if necessary. More... | |
Static Private Member Functions | |
static void | copy_layout_properties (PangoLayout &src, PangoLayout &dst) |
Private Attributes | |
std::unique_ptr< PangoContext, std::function< void(void *)> > | context_ |
std::unique_ptr< PangoLayout, std::function< void(void *)> > | layout_ |
PangoRectangle | rect_ |
std::string | text_ |
The text to draw (stored as UTF-8). More... | |
bool | markedup_text_ |
Does the text contain pango markup? If different render routines must be used. More... | |
bool | link_aware_ |
Are hyperlinks in the text marked-up, and will get_link return them. More... | |
color_t | link_color_ |
The color to render links in. More... | |
font::family_class | font_class_ |
The font family class used. More... | |
unsigned | font_size_ |
The font size to draw. More... | |
FONT_STYLE | font_style_ |
The style of the font, this is an orred mask of the font flags. More... | |
color_t | foreground_color_ |
The foreground color. More... | |
bool | add_outline_ |
Whether to add an outline effect. More... | |
int | maximum_width_ |
The maximum width of the text. More... | |
unsigned | characters_per_line_ |
The number of characters per line. More... | |
int | maximum_height_ |
The maximum height of the text. More... | |
PangoEllipsizeMode | ellipse_mode_ |
The way too long text is shown depends on this mode. More... | |
PangoAlignment | alignment_ |
The alignment of the text. More... | |
std::size_t | maximum_length_ |
The maximum length of the text. More... | |
bool | calculation_dirty_ |
The text has two dirty states: More... | |
std::size_t | length_ |
Length of the text. More... | |
int | pixel_scale_ |
The pixel scale, used to render high-DPI text. More... | |
std::vector< uint8_t > | surface_buffer_ |
Buffer to store the image on. More... | |
Friends | |
struct | std::hash< pango_text > |
Allow specialization of std::hash for pango_text. More... | |
Text class.
This class represents text which is rendered using Pango.
It takes text, as a utf-8 std::string, plus formatting options including font and color. It provides a surface object which holds the rendered text.
Besides this, it can do some additional calculations using the font layout.
It can take an index into the text, and convert it to pixel coordinates, so that if we want to draw a cursor in an editbox, we know where to draw it.
It can also take a pixel coordinate with respect to the text layout, and translate it back to an index into the original text. This is useful if the user clicks on the text, and we want to know where to move the cursor.
The get_token method takes a pixel coordinate, which we assume represents a click position, and gets the corresponding "token" from the string. The default token delimiters are whitespace " \n\r\t". So, this returns the "word" that the user clicked on.
Finally, the get_link method represents special support for hyperlinks in text. A token "looks like a link" if it begins "http://" or "https://". If a text has link_aware enabled, then any such token is rendered with an underline and in a special color, see link_color
. The get_link method calls get_token and further checks if the clicked token looks like a link.
This class stores the text to draw and uses pango with the cairo backend to render the text. See http://pango.org for more info.
font::pango_text::pango_text | ( | ) |
Definition at line 70 of file text.cpp.
References alignment_, context_, ellipse_mode_, and layout_.
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Calculates surface size.
Definition at line 589 of file text.cpp.
References characters_per_line_, context_, DBG_GUI_L, gui2::debug_truncate(), f, font_class_, font_size_, font_style_, font::get_font_families(), markedup_text_, maximum_height_, maximum_width_, utf8::size(), STYLE_UNDERLINE, text_, and w.
Referenced by recalculate().
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Renders the text to a surface.
Definition at line 779 of file text.cpp.
References rect_.
Referenced by render_and_get_texture(), and render_surface().
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Definition at line 784 of file text.cpp.
References DBG_FT, font::from_cairo_format(), layout_, render(), and surface_buffer_.
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Replaces all instances of URLs in a given string with formatted links and returns the result.
Definition at line 859 of file text.cpp.
References font::format_as_link(), link_color_, and font::looks_like_url().
Referenced by set_markup().
Gets the column of line of the character at the position.
position | The pixel position in the text area. |
Definition at line 299 of file text.cpp.
References get_cursor_position(), i, utf8::index(), layout_, draw::line(), draw::point(), and recalculate().
point font::pango_text::get_cursor_position | ( | const unsigned | column, |
const unsigned | line = 0 |
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Gets the location for the cursor, in drawing coordinates.
column | The column offset of the cursor. |
line | The line offset of the cursor. |
Definition at line 203 of file text.cpp.
References i, layout_, draw::line(), draw::point(), recalculate(), draw::rect(), and to_draw_scale().
Referenced by get_column_line().
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Gets the length of the text in bytes.
The text set is UTF-8 so the length of the string might not be the length of the text.
Definition at line 232 of file text.hpp.
References length_, and set_text().
Referenced by gui2::text_box_base::handle_editing(), gui2::text_box_base::handle_key_delete(), gui2::text_box_base::handle_key_right_arrow(), gui2::text_box_base::set_cursor(), gui2::text_box_base::set_maximum_length(), gui2::text_box_base::set_selection(), and gui2::text_box_base::set_value().
std::vector< std::string > font::pango_text::get_lines | ( | ) | const |
Retrieves a list of strings with contents for each rendered line.
This method is not const because it requires rendering the text.
Definition at line 942 of file text.cpp.
References i, draw_manager::layout(), layout_, and recalculate().
std::string font::pango_text::get_link | ( | const point & | position | ) | const |
Checks if position points to a character in a link in the text, returns it if so, empty string otherwise.
Link-awareness must be enabled to get results.
position | The pixel position in the text area. |
Definition at line 284 of file text.cpp.
References get_token(), link_aware_, and font::looks_like_url().
Referenced by gui2::styled_widget::get_label_link().
int font::pango_text::get_max_glyph_height | ( | ) | const |
Returns the maximum glyph height of a font, in drawing coordinates.
Definition at line 534 of file text.cpp.
References context_, f, font_class_, font_size_, font_style_, font::get_font_families(), and pixel_scale_.
Referenced by font::get_max_height().
std::size_t font::pango_text::get_maximum_length | ( | ) | const |
Get maximum length.
Definition at line 247 of file text.cpp.
References maximum_length_.
point font::pango_text::get_size | ( | ) |
Returns the size of the text, in drawing coordinates.
Definition at line 168 of file text.cpp.
References recalculate(), rect_, to_draw_scale(), and update_pixel_scale().
Referenced by gui2::text_shape::draw(), display::draw_report(), and gui2::styled_widget::get_best_text_size().
std::string font::pango_text::get_token | ( | const point & | position, |
const char * | delimiters = " \n\r\t" |
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) | const |
Gets the largest collection of characters, including the token at position, and not including any characters from the delimiters set.
position | The pixel position in the text area. |
delimiters |
Definition at line 252 of file text.cpp.
References d, utf8::index(), layout_, and recalculate().
Referenced by gui2::styled_widget::get_label_token(), and get_link().
unsigned font::pango_text::insert_text | ( | const unsigned | offset, |
const std::string & | text | ||
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Inserts UTF-8 text.
offset | The position to insert the text. |
text | The UTF-8 text to insert. |
Definition at line 183 of file text.cpp.
References utf8::index(), utf8::insert(), length_, maximum_length_, set_text(), utf8::size(), and text_.
Referenced by gui2::text_box_base::handle_editing(), gui2::text_box_base::insert_char(), and gui2::text_box_base::paste_selection().
bool font::pango_text::is_truncated | ( | ) | const |
Has the text been truncated? This happens if it exceeds max width or height.
Definition at line 176 of file text.cpp.
References layout_, and recalculate().
Referenced by gui2::styled_widget::get_best_text_size(), and gui2::styled_widget::place().
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Definition at line 272 of file text.hpp.
References b, link_aware_, set_add_outline(), set_link_aware(), and set_link_color().
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Recalculates the text layout.
Definition at line 575 of file text.cpp.
References calculate_size(), calculation_dirty_, layout_, and rect_.
Referenced by get_column_line(), get_cursor_position(), get_lines(), get_size(), get_token(), is_truncated(), render_and_get_texture(), and render_surface().
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Definition at line 728 of file text.cpp.
References add_outline_, foreground_color_, draw_manager::layout(), and surface_buffer_.
Referenced by create_surface().
texture font::pango_text::render_and_get_texture | ( | ) |
Returns the cached texture, or creates a new one otherwise.
Definition at line 116 of file text.cpp.
References create_surface(), recalculate(), update_pixel_scale(), and with_draw_scale().
Referenced by font::floating_label::create_texture(), gui2::text_shape::draw(), and display::draw_report().
surface font::pango_text::render_surface | ( | const SDL_Rect & | viewport | ) |
Returns the rendered text.
viewport | Only this area needs to be drawn - the returned surface's origin will correspond to viewport.x and viewport.y, the width and height will be at least viewport.w and viewport.h (although they may be larger). |
Definition at line 136 of file text.cpp.
References create_surface(), recalculate(), and update_pixel_scale().
surface font::pango_text::render_surface | ( | ) |
Equivalent to render(viewport), where the viewport's top-left is at (0,0) and the area is large enough to contain the full text.
The top-left of the viewport will be at (0,0), regardless of the values of x and y. If the x or y co-ordinates are non-zero, then x columns and y rows of blank space are included in the amount of memory allocated.
Definition at line 143 of file text.cpp.
References create_surface(), recalculate(), and update_pixel_scale().
Referenced by render_texture().
texture font::pango_text::render_texture | ( | const SDL_Rect & | viewport | ) |
Returns the rendered text as a texture.
texture::w() and texture::h() methods will return the expected width and height of the texture in draw space. This may differ from the real value returned by texture::get_info().
In almost all cases, use w() and h() to get the size of the rendered text for drawing.
This function is otherwise identical to render().
Definition at line 111 of file text.cpp.
References render_surface(), and with_draw_scale().
pango_text & font::pango_text::set_add_outline | ( | bool | do_add | ) |
Definition at line 524 of file text.cpp.
References add_outline_.
Referenced by font::floating_label::create_texture(), and link_aware().
pango_text & font::pango_text::set_alignment | ( | const PangoAlignment | alignment | ) |
Definition at line 482 of file text.cpp.
References alignment_, and layout_.
Referenced by font::floating_label::create_texture(), gui2::text_shape::draw(), display::draw_report(), gui2::styled_widget::get_best_text_size(), and text().
pango_text & font::pango_text::set_characters_per_line | ( | const unsigned | characters_per_line | ) |
Definition at line 426 of file text.cpp.
References calculation_dirty_, and characters_per_line_.
Referenced by font::floating_label::create_texture(), gui2::text_shape::draw(), display::draw_report(), gui2::styled_widget::get_best_text_size(), and text().
pango_text & font::pango_text::set_ellipse_mode | ( | const PangoEllipsizeMode | ellipse_mode | ) |
Definition at line 462 of file text.cpp.
References calculation_dirty_, ellipse_mode_, and layout_.
Referenced by font::floating_label::create_texture(), gui2::text_shape::draw(), display::draw_report(), gui2::styled_widget::get_best_text_size(), and text().
pango_text & font::pango_text::set_family_class | ( | font::family_class | fclass | ) |
Definition at line 369 of file text.cpp.
References calculation_dirty_, and font_class_.
Referenced by font::floating_label::create_texture(), gui2::text_shape::draw(), display::draw_report(), gui2::styled_widget::get_best_text_size(), font::get_max_height(), text(), and gui2::text_box_base::text_box_base().
pango_text & font::pango_text::set_font_size | ( | unsigned | font_size | ) |
Definition at line 379 of file text.cpp.
References calculation_dirty_, preferences::font_scaled(), font_size_, and pixel_scale_.
Referenced by font::floating_label::create_texture(), gui2::text_shape::draw(), display::draw_report(), gui2::styled_widget::get_best_text_size(), font::get_max_height(), and text().
pango_text & font::pango_text::set_font_style | ( | const FONT_STYLE | font_style | ) |
Definition at line 391 of file text.cpp.
References calculation_dirty_, and font_style_.
Referenced by font::floating_label::create_texture(), gui2::text_shape::draw(), gui2::styled_widget::get_best_text_size(), font::get_max_height(), and text().
pango_text & font::pango_text::set_foreground_color | ( | const color_t & | color | ) |
Definition at line 401 of file text.cpp.
References foreground_color_.
Referenced by font::floating_label::create_texture(), gui2::text_shape::draw(), display::draw_report(), and text().
pango_text & font::pango_text::set_link_aware | ( | bool | b | ) |
Definition at line 505 of file text.cpp.
References b, calculation_dirty_, and link_aware_.
Referenced by font::floating_label::create_texture(), gui2::text_shape::draw(), display::draw_report(), gui2::styled_widget::get_best_text_size(), and link_aware().
pango_text & font::pango_text::set_link_color | ( | const color_t & | color | ) |
Definition at line 514 of file text.cpp.
References calculation_dirty_, and link_color_.
Referenced by gui2::text_shape::draw(), gui2::styled_widget::get_best_text_size(), and link_aware().
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Sets the markup'ed text.
It tries to set the text as markup. If the markup is invalid it will try a bit harder to recover from the errors and still set the markup.
text | The text to set as markup. |
layout |
Definition at line 829 of file text.cpp.
References _(), ERR_GUI_L, format_links(), link_aware_, set_text(), and validate_markup().
Referenced by set_text().
pango_text & font::pango_text::set_maximum_height | ( | int | height, |
bool | multiline | ||
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Definition at line 437 of file text.cpp.
References calculation_dirty_, layout_, maximum_height_, and pixel_scale_.
Referenced by font::floating_label::create_texture(), gui2::text_shape::draw(), display::draw_report(), and text().
pango_text & font::pango_text::set_maximum_length | ( | const std::size_t | maximum_length | ) |
Definition at line 492 of file text.cpp.
References length_, maximum_length_, set_text(), text_, and utf8::truncate().
Referenced by gui2::text_box_base::set_maximum_length(), and text().
pango_text & font::pango_text::set_maximum_width | ( | int | width | ) |
Definition at line 410 of file text.cpp.
References calculation_dirty_, maximum_width_, and pixel_scale_.
Referenced by font::floating_label::create_texture(), gui2::text_shape::draw(), gui2::styled_widget::get_best_text_size(), and text().
bool font::pango_text::set_text | ( | const std::string & | text, |
const bool | markedup | ||
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Sets the text to render.
text | The text to render. |
markedup | Should the text be rendered with pango markup. If the markup is invalid it's rendered as text without markup. |
Definition at line 333 of file text.cpp.
References calculation_dirty_, context_, ERR_GUI_L, layout_, length_, markedup_text_, set_markup(), text(), text_, and unicode_cast().
Referenced by font::floating_label::create_texture(), gui2::text_shape::draw(), display::draw_report(), gui2::styled_widget::get_best_text_size(), get_length(), gui2::text_box_base::handle_editing(), insert_text(), gui2::styled_widget::set_label(), set_markup(), set_maximum_length(), and gui2::text_box_base::set_value().
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Definition at line 250 of file text.hpp.
References set_alignment(), set_characters_per_line(), set_ellipse_mode(), set_family_class(), set_font_size(), set_font_style(), set_foreground_color(), set_maximum_height(), set_maximum_length(), set_maximum_width(), and text_.
Referenced by gui2::text_box_base::copy_selection(), gui2::text_box_base::get_composition_length(), gui2::text_box_base::handle_editing(), set_text(), and gui2::text_box_base::set_value().
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Scale the given render-space size to draw-space, rounding up.
Definition at line 157 of file text.cpp.
References pixel_scale_.
Referenced by get_cursor_position(), get_size(), to_draw_scale(), and with_draw_scale().
Scale the given render-space point to draw-space, rounding up.
Definition at line 162 of file text.cpp.
References to_draw_scale().
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Update pixel scale, if necessary.
Definition at line 554 of file text.cpp.
References calculation_dirty_, font_size_, video::get_pixel_scale(), maximum_height_, maximum_width_, and pixel_scale_.
Referenced by get_size(), render_and_get_texture(), and render_surface().
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Definition at line 897 of file text.cpp.
References font::semi_escape_text(), and WRN_GUI_L.
Referenced by set_markup().
Adjust a texture's draw-width and height according to pixel scale.
As fonts are rendered at output-scale, we need to do this just before returning the rendered texture. These attributes are stored as part of the returned texture object.
Definition at line 150 of file text.cpp.
References texture::get_raw_size(), texture::set_draw_size(), and to_draw_scale().
Referenced by render_and_get_texture(), and render_texture().
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Allow specialization of std::hash for pango_text.
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Whether to add an outline effect.
Definition at line 318 of file text.hpp.
Referenced by std::hash< font::pango_text >::operator()(), render(), and set_add_outline().
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The alignment of the text.
Definition at line 360 of file text.hpp.
Referenced by std::hash< font::pango_text >::operator()(), pango_text(), and set_alignment().
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The text has two dirty states:
Definition at line 372 of file text.hpp.
Referenced by recalculate(), set_characters_per_line(), set_ellipse_mode(), set_family_class(), set_font_size(), set_font_style(), set_link_aware(), set_link_color(), set_maximum_height(), set_maximum_width(), set_text(), and update_pixel_scale().
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The number of characters per line.
This can be used as an alternative of maximum_width_. The user can select a number of characters on a line for wrapping. When the value is non-zero it determines the maximum width based on the average character width.
If both maximum_width_ and characters_per_line_ are set the minimum of the two will be the maximum.
Definition at line 346 of file text.hpp.
Referenced by calculate_size(), and set_characters_per_line().
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Definition at line 283 of file text.hpp.
Referenced by calculate_size(), get_max_glyph_height(), pango_text(), and set_text().
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The way too long text is shown depends on this mode.
Definition at line 357 of file text.hpp.
Referenced by std::hash< font::pango_text >::operator()(), pango_text(), and set_ellipse_mode().
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The font family class used.
Definition at line 306 of file text.hpp.
Referenced by calculate_size(), get_max_glyph_height(), std::hash< font::pango_text >::operator()(), and set_family_class().
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The font size to draw.
Definition at line 309 of file text.hpp.
Referenced by calculate_size(), get_max_glyph_height(), std::hash< font::pango_text >::operator()(), set_font_size(), and update_pixel_scale().
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The style of the font, this is an orred mask of the font flags.
Definition at line 312 of file text.hpp.
Referenced by calculate_size(), get_max_glyph_height(), std::hash< font::pango_text >::operator()(), and set_font_style().
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The foreground color.
Definition at line 315 of file text.hpp.
Referenced by std::hash< font::pango_text >::operator()(), render(), and set_foreground_color().
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Definition at line 284 of file text.hpp.
Referenced by create_surface(), get_column_line(), get_cursor_position(), get_lines(), get_token(), is_truncated(), pango_text(), recalculate(), set_alignment(), set_ellipse_mode(), set_maximum_height(), and set_text().
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Length of the text.
Definition at line 375 of file text.hpp.
Referenced by get_length(), insert_text(), set_maximum_length(), and set_text().
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Are hyperlinks in the text marked-up, and will get_link return them.
Definition at line 294 of file text.hpp.
Referenced by get_link(), link_aware(), set_link_aware(), and set_markup().
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The color to render links in.
Links are formatted using pango <span> as follows:
<span underline="single" color=" + link_color_ + ">
Definition at line 303 of file text.hpp.
Referenced by format_links(), and set_link_color().
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Does the text contain pango markup? If different render routines must be used.
Definition at line 291 of file text.hpp.
Referenced by calculate_size(), and set_text().
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The maximum height of the text.
Values less or equal to 0 mean no maximum and are internally stored as -1, since that's the value pango uses for it.
Definition at line 354 of file text.hpp.
Referenced by calculate_size(), std::hash< font::pango_text >::operator()(), set_maximum_height(), and update_pixel_scale().
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The maximum length of the text.
Definition at line 363 of file text.hpp.
Referenced by get_maximum_length(), insert_text(), and set_maximum_length().
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The maximum width of the text.
Values less or equal to 0 mean no maximum and are internally stored as -1, since that's the value pango uses for it.
See characters_per_line_.
Definition at line 328 of file text.hpp.
Referenced by calculate_size(), std::hash< font::pango_text >::operator()(), set_maximum_width(), and update_pixel_scale().
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The pixel scale, used to render high-DPI text.
Definition at line 378 of file text.hpp.
Referenced by get_max_glyph_height(), set_font_size(), set_maximum_height(), set_maximum_width(), to_draw_scale(), and update_pixel_scale().
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Definition at line 285 of file text.hpp.
Referenced by create_surface(), get_size(), std::hash< font::pango_text >::operator()(), and recalculate().
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Buffer to store the image on.
We use a cairo surface to draw on this buffer and then use the buffer as data source for the SDL_Surface. This means the buffer needs to be stored in the object, since SDL_Surface doesn't own its buffer.
Definition at line 402 of file text.hpp.
Referenced by create_surface(), and render().
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The text to draw (stored as UTF-8).
Definition at line 288 of file text.hpp.
Referenced by calculate_size(), insert_text(), std::hash< font::pango_text >::operator()(), set_maximum_length(), set_text(), and text().