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122 lines
3.4 KiB
C
122 lines
3.4 KiB
C
/** \file screen.h High level library for handling the terminal screen
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The screen library allows the interactive reader to write its
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output to screen efficiently by keeping an inetrnal representation
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of the current screen contents and trying to find the most
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efficient way for transforming that to the desired screen content.
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*/
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#ifndef FISH_SCREEN_H
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#define FISH_SCREEN_H
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/**
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The struct representing the current and desired screen contents.
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*/
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typedef struct
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{
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/*
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The internal representation of the desired screen contents.
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*/
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array_list_t desired;
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/**
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The internal representation of the actual screen contents.
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*/
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array_list_t actual;
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/**
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The desired cursor position.
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*/
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int desired_cursor[2];
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/**
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The actual cursor position.
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*/
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int actual_cursor[2];
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/**
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A stringbuffer containing the prompt which was last printed to
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the screen.
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*/
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string_buffer_t actual_prompt;
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/*
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The actual width of the screen at the time of the last screen
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write.
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*/
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int actual_width;
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/**
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This flag is set to true when there is reason to suspect that
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the parts of the screen lines where the actual content is not
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filled in may be non-empty. This means that a clr_eol command
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has to be sent to the terminal at the end of each line.
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*/
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int need_clear;
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/**
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These status buffers are used to check if any output has occurred
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other than from fish's main loop, in which case we need to redraw.
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*/
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struct stat prev_buff_1, prev_buff_2, post_buff_1, post_buff_2;
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}
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screen_t;
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/**
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A struct representing a single line of a screen. Consists of two
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array_lists, which must always be of the same length.
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*/
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typedef struct
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{
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/**
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The text contents of the line. Each element of the array
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represents on column of output. Because some characters are two
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columns wide, it is perfectly possible for some of the comumns
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to be empty.
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*/
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array_list_t text;
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/**
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Highlight information for the line
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*/
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array_list_t color;
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}
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line_t;
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/**
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Initialize a new screen struct
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*/
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void s_init( screen_t *s );
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/**
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Free all memory used by the specified screen struct
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*/
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void s_destroy( screen_t *s );
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/**
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This is the main function for the screen putput library. It is used
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to define the desired contents of the screen. The screen command
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will use it's knowlege of the current contents of the screen in
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order to render the desired output using as few terminal commands
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as possible.
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*/
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void s_write( screen_t *s,
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wchar_t *prompt,
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wchar_t *commandline,
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int *colors,
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int *indent,
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int cursor_pos );
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/**
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This function resets the screen buffers internal knowledge about
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the contents of the screen. Use this function when some other
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function than s_write has written to the screen.
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\param s the screen to reset
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\param reset_cursor whether the line on which the curor has changed should be assumed to have changed. If \c reset_cursor is set to 0, the library will attempt to make sure that the screen area does not seem to move up or down on repaint.
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If reset_cursor is incorreclt set to 0, this may result in screen
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contents being erased. If it is incorrectly set to one, it may
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result in one or more lines of garbage on screen on the next
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repaint. If this happens during a loop, such as an interactive
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resizing, there will be one line of garbage for every repaint,
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which will quicly fill the screen.
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*/
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void s_reset( screen_t *s, int reset_cursor );
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#endif
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