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Copy pathpager.h
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167 lines (117 loc) · 5.29 KB
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/** \file pager.h
Pager support
*/
#include "complete.h"
#include "screen.h"
#include "reader.h"
#define PAGER_SELECTION_NONE ((size_t)(-1))
/* Represents rendering from the pager */
class page_rendering_t
{
public:
int term_width;
int term_height;
size_t rows;
size_t cols;
size_t row_start;
size_t row_end;
size_t selected_completion_idx;
screen_data_t screen_data;
size_t remaining_to_disclose;
bool search_field_shown;
editable_line_t search_field_line;
/* Returns a rendering with invalid data, useful to indicate "no rendering" */
page_rendering_t();
};
/* The space between adjacent completions */
#define PAGER_SPACER_STRING L" "
#define PAGER_SPACER_STRING_WIDTH 2
/* How many rows we will show in the "initial" pager */
#define PAGER_UNDISCLOSED_MAX_ROWS 4
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 available_term_width;
int available_term_height;
size_t selected_completion_idx;
size_t suggested_row_start;
/* Fully disclosed means that we show all completions */
bool fully_disclosed;
/* Whether we show the search field */
bool search_field_shown;
/* Returns the index of the completion that should draw selected, using the given number of columns */
size_t visual_selected_completion_index(size_t rows, size_t cols) const;
/** 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;
/** The representative completion */
completion_t representative;
/** On-screen width of the completion string */
int comp_width;
/** On-screen width of the description information */
int desc_width;
/** Preferred total width */
int pref_width;
/** Minimum acceptable width */
int min_width;
comp_t() : comp(), desc(), representative(L""), comp_width(0), desc_width(0), pref_width(0), min_width(0)
{
}
};
private:
typedef std::vector<comp_t> comp_info_list_t;
/* The filtered list of completion infos */
comp_info_list_t completion_infos;
/* The unfiltered list. Note there's a lot of duplication here. */
comp_info_list_t unfiltered_completion_infos;
wcstring prefix;
void note_selection_changed();
bool completion_try_print(size_t cols, const wcstring &prefix, const comp_info_list_t &lst, page_rendering_t *rendering, size_t suggested_start_row) const;
void recalc_min_widths(comp_info_list_t * lst) const;
void measure_completion_infos(std::vector<comp_t> *infos, const wcstring &prefix) const;
bool completion_info_passes_filter(const comp_t &info) const;
void completion_print(size_t cols, int *width_per_column, size_t row_start, size_t 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:
/* The text of the search field */
editable_line_t search_field_line;
/* 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);
/* Changes the selected completion in the given direction according to the layout of the given rendering. Returns true if the selection changed. */
bool select_next_completion_in_direction(selection_direction_t direction, const page_rendering_t &rendering);
/* Returns the currently selected completion for the given rendering */
const completion_t *selected_completion(const page_rendering_t &rendering) const;
/* Indicates the row and column for the given rendering. Returns -1 if no selection. */
size_t get_selected_row(const page_rendering_t &rendering) const;
size_t get_selected_column(const page_rendering_t &rendering) const;
/* 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();
/* Updates the completions list per the filter */
void refilter_completions();
/* Sets whether the search field is shown */
void set_search_field_shown(bool flag);
/* Gets whether the search field shown */
bool is_search_field_shown() const;
/* Indicates if we are navigating our contents */
bool is_navigating_contents() const;
/* Position of the cursor */
size_t cursor_position() const;
/* Constructor */
pager_t();
};