Rectify listview behaviour
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563c278771
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B715679E3A361BE6
176
nncmpp.c
176
nncmpp.c
@ -947,66 +947,76 @@ app_redraw (void)
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// --- Actions -----------------------------------------------------------------
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/// Scroll up @a n items. Doesn't redraw.
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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_scroll_up (int n)
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app_fix_view_range (void)
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{
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struct tab *tab = g_ctx.active_tab;
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if (tab->item_top < n)
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if (tab->item_top < 0)
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{
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tab->item_top = 0;
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return false;
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}
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tab->item_top -= n;
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return true;
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}
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/// Scroll down @a n items. Doesn't redraw.
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static bool
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app_scroll_down (int n)
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{
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struct tab *tab = g_ctx.active_tab;
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// TODO: if (n_items >= lines), don't allow to scroll off past the end
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if ((tab->item_top += n) >= (int) tab->item_count)
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// If the contents are at least as long as the screen, always fill it
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int max_item_top = (int) tab->item_count - app_visible_items ();
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// But don't let that suggest a negative offset
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max_item_top = MAX (max_item_top, 0);
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if (tab->item_top > max_item_top)
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{
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if (tab->item_count)
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tab->item_top = tab->item_count - 1;
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else
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tab->item_top = 0;
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tab->item_top = max_item_top;
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return false;
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}
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return true;
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}
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/// Moves the selection one item up.
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/// Scroll down (positive) or up (negative) @a n items. Doesn't redraw.
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static bool
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app_one_item_up (void)
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app_scroll (int n)
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{
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struct tab *tab = g_ctx.active_tab;
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if (tab->item_selected < 1)
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return false;
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if (--tab->item_selected < tab->item_top)
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app_scroll_up (tab->item_top - tab->item_selected);
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app_redraw_view ();
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return true;
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g_ctx.active_tab->item_top += n;
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return app_fix_view_range ();
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}
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/// Moves the selection one item down.
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static bool
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app_one_item_down (void)
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static void
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app_ensure_selection_visible (void)
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{
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struct tab *tab = g_ctx.active_tab;
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if (tab->item_selected + 1 >= (int) tab->item_count)
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return false;
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if (tab->item_selected < 0)
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return;
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int n_visible = LINES - g_ctx.top_height;
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if (++tab->item_selected >= tab->item_top + n_visible)
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app_scroll_down (1);
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int too_high = tab->item_top - tab->item_selected;
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if (too_high > 0)
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app_scroll (-too_high);
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int too_low = tab->item_selected
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- (tab->item_top + app_visible_items () - 1);
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if (too_low > 0)
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app_scroll (too_low);
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}
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static bool
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app_move_selection (int diff)
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{
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struct tab *tab = g_ctx.active_tab;
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int fixed = tab->item_selected += diff;
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fixed = MAX (fixed, 0);
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fixed = MIN (fixed, (int) tab->item_count - 1);
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bool result = tab->item_selected != fixed;
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tab->item_selected = fixed;
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app_ensure_selection_visible ();
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app_redraw_view ();
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return true;
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return result;
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}
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static bool
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@ -1023,25 +1033,6 @@ app_goto_tab (int tab_index)
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return false;
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}
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static void
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app_process_resize (void)
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{
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struct tab *tab = g_ctx.active_tab;
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if (tab->item_selected < 0)
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return;
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int n_visible = LINES - g_ctx.top_height;
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if (n_visible < 0)
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return;
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// Scroll up as needed to keep the selection visible
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int selected_offset = tab->item_selected - tab->item_top;
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if (selected_offset >= n_visible)
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app_scroll_up (selected_offset - n_visible + 1);
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app_redraw ();
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}
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// --- User input handling -----------------------------------------------------
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enum user_action
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@ -1058,6 +1049,11 @@ enum user_action
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USER_ACTION_MPD_VOLUME_UP,
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USER_ACTION_MPD_VOLUME_DOWN,
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USER_ACTION_SCROLL_UP,
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USER_ACTION_SCROLL_DOWN,
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USER_ACTION_GOTO_TOP,
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USER_ACTION_GOTO_BOTTOM,
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USER_ACTION_GOTO_ITEM_PREVIOUS,
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USER_ACTION_GOTO_ITEM_NEXT,
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USER_ACTION_GOTO_PAGE_PREVIOUS,
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@ -1081,6 +1077,7 @@ static bool
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app_process_user_action (enum user_action action)
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{
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struct mpd_client *c = &g_ctx.client;
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struct tab *tab = g_ctx.active_tab;
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switch (action)
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{
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case USER_ACTION_QUIT:
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@ -1131,20 +1128,48 @@ app_process_user_action (enum user_action action)
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// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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// XXX: these should rather be parametrized
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case USER_ACTION_SCROLL_UP:
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app_scroll (-3);
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app_redraw_view ();
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return true;
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case USER_ACTION_SCROLL_DOWN:
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app_scroll (3);
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app_redraw_view ();
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return true;
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case USER_ACTION_GOTO_TOP:
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if (tab->item_count)
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{
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g_ctx.active_tab->item_selected = 0;
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app_ensure_selection_visible ();
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app_redraw_view ();
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}
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return true;
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case USER_ACTION_GOTO_BOTTOM:
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if (tab->item_count)
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{
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g_ctx.active_tab->item_selected =
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(int) g_ctx.active_tab->item_count - 1;
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app_ensure_selection_visible ();
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app_redraw_view ();
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}
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return true;
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case USER_ACTION_GOTO_ITEM_PREVIOUS:
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app_one_item_up ();
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app_move_selection (-1);
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return true;
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case USER_ACTION_GOTO_ITEM_NEXT:
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app_one_item_down ();
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app_move_selection (1);
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return true;
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case USER_ACTION_GOTO_PAGE_PREVIOUS:
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app_scroll_up (LINES - (int) g_ctx.top_height);
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app_redraw_view ();
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app_scroll ((int) g_ctx.top_height - LINES);
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app_move_selection ((int) g_ctx.top_height - LINES);
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return true;
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case USER_ACTION_GOTO_PAGE_NEXT:
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app_scroll_down (LINES - (int) g_ctx.top_height);
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app_redraw_view ();
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app_scroll (LINES - (int) g_ctx.top_height);
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app_move_selection (LINES - (int) g_ctx.top_height);
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return true;
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// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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@ -1240,9 +1265,9 @@ app_process_mouse (termo_key_t *event)
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if (button == 1)
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app_process_left_mouse_click (line, column);
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else if (button == 4)
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app_process_user_action (USER_ACTION_GOTO_ITEM_PREVIOUS);
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app_process_user_action (USER_ACTION_SCROLL_UP);
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else if (button == 5)
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app_process_user_action (USER_ACTION_GOTO_ITEM_NEXT);
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app_process_user_action (USER_ACTION_SCROLL_DOWN);
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return true;
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}
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@ -1259,8 +1284,12 @@ g_default_bindings[] =
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{ "Escape", USER_ACTION_QUIT },
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{ "C-l", USER_ACTION_REDRAW },
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{ "Home", USER_ACTION_GOTO_TOP },
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{ "End", USER_ACTION_GOTO_BOTTOM },
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{ "Up", USER_ACTION_GOTO_ITEM_PREVIOUS },
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{ "Down", USER_ACTION_GOTO_ITEM_NEXT },
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{ "k", USER_ACTION_GOTO_ITEM_PREVIOUS },
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{ "j", USER_ACTION_GOTO_ITEM_NEXT },
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{ "PageUp", USER_ACTION_GOTO_PAGE_PREVIOUS },
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{ "PageDown", USER_ACTION_GOTO_PAGE_NEXT },
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{ "C-p", USER_ACTION_GOTO_ITEM_PREVIOUS },
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@ -1270,9 +1299,11 @@ g_default_bindings[] =
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// Not sure how to set these up, they're pretty arbitrary so far
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{ "Left", USER_ACTION_MPD_PREVIOUS },
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{ "Right", USER_ACTION_MPD_NEXT },
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{ "h", USER_ACTION_MPD_PREVIOUS },
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{ "l", USER_ACTION_MPD_NEXT },
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{ "Space", USER_ACTION_MPD_TOGGLE },
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{ "C-Space", USER_ACTION_MPD_STOP },
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{ "Right", USER_ACTION_MPD_NEXT },
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{ "M-PageUp", USER_ACTION_MPD_VOLUME_UP },
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{ "M-PageDown", USER_ACTION_MPD_VOLUME_DOWN },
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{ NULL, USER_ACTION_NONE },
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@ -1305,11 +1336,6 @@ app_process_termo_event (termo_key_t *event)
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beep ();
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return true;
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}
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if (!event->modifiers)
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{
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// TODO: normal unmodified keys will have functions as well
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ucs4_t c = event->code.codepoint;
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}
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return true;
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}
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@ -1740,7 +1766,15 @@ app_on_signal_pipe_readable (const struct pollfd *fd, void *user_data)
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if (g_winch_received)
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{
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update_curses_terminal_size ();
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app_process_resize ();
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app_redraw_top ();
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app_fix_view_range ();
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#if SELECTION_SHOULD_BE_VISIBLE_AFTER_RESIZE
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// First we had to make the assumptions of this valid
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app_ensure_selection_visible ();
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#endif
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app_redraw_view ();
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g_winch_received = false;
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}
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}
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