Add a scrollbar
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f0c7092521
commit
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B715679E3A361BE6
125
nncmpp.c
125
nncmpp.c
@ -113,7 +113,8 @@ update_curses_terminal_size (void)
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\
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XX( EVEN, "even", -1, -1, 0 ) \
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XX( ODD, "odd", -1, -1, 0 ) \
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XX( SELECTION, "selection", -1, -1, A_REVERSE )
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XX( SELECTION, "selection", -1, -1, A_REVERSE ) \
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XX( SCROLLBAR, "scrollbar", -1, -1, 0 )
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enum
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{
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@ -150,6 +151,7 @@ struct row_buffer;
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typedef bool (*tab_event_fn) (struct tab *self, termo_key_t *event);
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/// Draw an item to the screen using the row buffer API
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// TODO: this will probably want to know the actual width
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typedef void (*tab_item_draw_fn)
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(struct tab *self, unsigned item_index, struct row_buffer *buffer);
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@ -230,6 +232,7 @@ static struct app_context
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termo_t *tk; ///< termo handle
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struct poller_timer tk_timer; ///< termo timeout timer
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bool locale_is_utf8; ///< The locale is Unicode
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bool use_partial_boxes; ///< Use Unicode box drawing chars
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struct attrs attrs[ATTRIBUTE_COUNT];
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}
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@ -411,6 +414,10 @@ app_init_context (void)
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// Note that non-Unicode locales are handled pretty inefficiently.
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g_ctx.locale_is_utf8 = !strcasecmp_ascii (locale_charset (), "UTF-8");
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// It doesn't work 100% (e.g. incompatible with undelining in urxvt)
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// TODO: make this configurable
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g_ctx.use_partial_boxes = g_ctx.locale_is_utf8;
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app_init_attributes ();
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}
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@ -762,18 +769,15 @@ app_write_gauge (struct row_buffer *buf, float ratio, int width)
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// because sometimes Unicode is even useful
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int len_left = ratio * width * 8 + 0.5;
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static const char *partials[] = { " ", "▏", "▎", "▍", "▌", "▋", "▊", "▉"};
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int remainder = len_left % N_ELEMENTS (partials);
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len_left /= N_ELEMENTS (partials);
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static const char *partials[] = { " ", "▏", "▎", "▍", "▌", "▋", "▊", "▉" };
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int remainder = len_left % 8;
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len_left /= 8;
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// Assuming that if we can show the 1/8 box then we can show them all
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const char *partial = NULL;
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// TODO: cache this setting and make it configurable since it doesn't seem
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// to work 100% (e.g. incompatible with undelining in urxvt)
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if (!app_is_character_in_locale (L'▏'))
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len_left += remainder >= (int) N_ELEMENTS (partials) / 2;
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else
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if (g_ctx.use_partial_boxes)
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partial = partials[remainder];
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else
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len_left += remainder >= (int) 4;
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int len_right = width - len_left;
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while (len_left-- > 0)
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@ -902,39 +906,119 @@ app_redraw_top (void)
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refresh ();
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}
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static int
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app_visible_items (void)
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{
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// This may eventually include a header bar and/or a status bar
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return MAX (0, LINES - g_ctx.top_height);
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}
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static void
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app_redraw_scrollbar (void)
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{
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// This assumes that we can write to the one-before-last column,
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// i.e. that it's not covered by any double-wide character (and that
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// ncurses comes to the right results when counting characters).
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//
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// We could also precompute the scrollbar and append it to each row
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// as we render them, plus all the unoccupied rows.
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struct tab *tab = g_ctx.active_tab;
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int visible_items = app_visible_items ();
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if (!g_ctx.use_partial_boxes)
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{
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// Apparently here we don't want the 0.5 rounding constant
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int length = (float) visible_items / (int) tab->item_count
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* (visible_items - 1);
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int start = (float) tab->item_top / (int) tab->item_count
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* (visible_items - 1);
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for (int row = 0; row < visible_items; row++)
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{
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move (g_ctx.top_height + row, COLS - 1);
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if (row < start || row > start + length + 1)
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addch (' ' | APP_ATTR (SCROLLBAR));
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else
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addch (' ' | APP_ATTR (SCROLLBAR) | A_REVERSE);
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}
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return;
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}
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// TODO: clamp the values, make sure they follow the right order
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// We subtract half a character from both the top and the bottom, hence -1
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int length = (float) visible_items / (int) tab->item_count
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* (visible_items - 1) * 8 + 0.5;
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int start = (float) tab->item_top / (int) tab->item_count
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* (visible_items - 1) * 8 + 0.5;
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// Then we make sure the bar is high at least one character, hence +8
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int end = start + length + 8;
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int start_part = start % 8; start /= 8;
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int end_part = end % 8; end /= 8;
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// Even with this, the solid part must be at least one character high
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static const char *partials[] = { "█", "▇", "▆", "▅", "▄", "▃", "▂", "▁" };
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for (int row = 0; row < visible_items; row++)
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{
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chtype attrs = APP_ATTR (SCROLLBAR);
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if (row > start && row <= end)
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attrs ^= A_REVERSE;
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const char *c = " ";
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if (row == start) c = partials[start_part];
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if (row == end) c = partials[end_part];
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move (g_ctx.top_height + row, COLS - 1);
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struct row_buffer buf;
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row_buffer_init (&buf);
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row_buffer_append (&buf, c, attrs);
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row_buffer_flush (&buf);
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row_buffer_free (&buf);
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}
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}
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static void
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app_redraw_view (void)
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{
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move (g_ctx.top_height, 0);
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clrtobot ();
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// TODO: display a scrollbar on the right side
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struct tab *tab = g_ctx.active_tab;
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bool want_scrollbar = (int) tab->item_count > app_visible_items ();
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int view_width = COLS - want_scrollbar;
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int to_show = MIN (LINES - g_ctx.top_height,
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(int) tab->item_count - tab->item_top);
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for (int row_index = 0; row_index < to_show; row_index++)
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for (int row = 0; row < to_show; row++)
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{
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int item_index = tab->item_top + row_index;
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int item_index = tab->item_top + row;
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int row_attrs = (item_index & 1) ? APP_ATTR (ODD) : APP_ATTR (EVEN);
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if (item_index == tab->item_selected)
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row_attrs = APP_ATTR (SELECTION);
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attrset (row_attrs);
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move (g_ctx.top_height + row, 0);
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struct row_buffer buf;
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row_buffer_init (&buf);
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tab->on_item_draw (tab, item_index, &buf);
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if (buf.total_width > COLS)
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row_buffer_ellipsis (&buf, COLS, row_attrs);
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if (buf.total_width > view_width)
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row_buffer_ellipsis (&buf, view_width, row_attrs);
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row_buffer_flush (&buf);
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for (int i = buf.total_width; i < COLS; i++)
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for (int i = buf.total_width; i < view_width; i++)
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addch (' ');
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row_buffer_free (&buf);
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}
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attrset (0);
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if (want_scrollbar)
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app_redraw_scrollbar ();
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refresh ();
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}
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@ -947,13 +1031,6 @@ app_redraw (void)
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// --- Actions -----------------------------------------------------------------
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static int
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app_visible_items (void)
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{
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// This may eventually include a header bar and/or a status bar
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return MAX (0, LINES - g_ctx.top_height);
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}
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/// Checks what items that are visible and returns if fixes were needed
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static bool
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app_fix_view_range (void)
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