fish-shell/pager.h
2014-01-17 12:04:03 -08:00

109 lines
3.3 KiB
C++

/** \file pager.h
Pager support
*/
#include "complete.h"
#include "screen.h"
/* Represents rendering from the pager */
class page_rendering_t
{
public:
int term_width;
int term_height;
size_t rows;
size_t cols;
size_t selected_completion_idx;
screen_data_t screen_data;
/* Returns a rendering with invalid data, useful to indicate "no rendering" */
page_rendering_t();
};
typedef std::vector<completion_t> completion_list_t;
page_rendering_t render_completions(const completion_list_t &raw_completions, const wcstring &prefix);
class pager_t
{
int term_width;
int term_height;
completion_list_t completions;
size_t selected_completion_idx;
/** Data structure describing one or a group of related completions */
public:
struct comp_t
{
/** The list of all completin strings this entry applies to */
wcstring_list_t comp;
/** The description */
wcstring desc;
/** On-screen width of the completion string */
int comp_width;
/** On-screen width of the description information */
int desc_width;
/** Preffered total width */
int pref_width;
/** Minimum acceptable width */
int min_width;
comp_t() : comp(), desc(), comp_width(0), desc_width(0), pref_width(0), min_width(0)
{
}
};
private:
typedef std::vector<comp_t> comp_info_list_t;
comp_info_list_t completion_infos;
wcstring prefix;
int completion_try_print(int cols, const wcstring &prefix, const comp_info_list_t &lst, page_rendering_t *rendering) const;
void recalc_min_widths(comp_info_list_t * lst) const;
void measure_completion_infos(std::vector<comp_t> *infos, const wcstring &prefix) const;
void completion_print(int cols, int *width_per_column, int row_start, int row_stop, const wcstring &prefix, const comp_info_list_t &lst, page_rendering_t *rendering) const;
line_t completion_print_item(const wcstring &prefix, const comp_t *c, size_t row, size_t column, int width, bool secondary, bool selected, page_rendering_t *rendering) const;
public:
/* Sets the set of completions */
void set_completions(const completion_list_t &comp);
/* Sets the prefix */
void set_prefix(const wcstring &pref);
/* Sets the terminal width and height */
void set_term_size(int w, int h);
/* Sets the index of the selected completion */
void set_selected_completion(size_t completion_idx);
/* Changes the selected completion in the given direction according to the layout of the given rendering. Returns true if the values changed. */
bool select_next_completion_in_direction(cardinal_direction_t direction, const page_rendering_t &rendering);
/* Produces a rendering of the completions, at the given term size */
page_rendering_t render() const;
/* Updates the rendering if it's stale */
void update_rendering(page_rendering_t *rendering) const;
/* Indicates if there are no completions, and therefore nothing to render */
bool empty() const;
/* Clears all completions and the prefix */
void clear();
/* Constructor */
pager_t();
};