From 68ac60509f11d3a449a317a8d9c092ac49763451 Mon Sep 17 00:00:00 2001
From: Phil Jones <philj56@gmail.com>
Date: Sun, 22 Jan 2023 14:32:51 +0000
Subject: Add page up & page down keybindings.

---
 doc/tofi.1.md  |  8 ++++++++
 doc/tofi.1.scd |  6 ++++++
 src/input.c    | 31 +++++++++++++++++++++++++++++++
 3 files changed, 45 insertions(+)

diff --git a/doc/tofi.1.md b/doc/tofi.1.md
index 818ad53..9ef52c6 100644
--- a/doc/tofi.1.md
+++ b/doc/tofi.1.md
@@ -48,6 +48,14 @@ the form **--key=value**.
 
 > Move the selection forward one entry.
 
+\<Page Up\>
+
+> Move the selection back one page.
+
+\<Page Down\>
+
+> Move the selection forward one page.
+
 \<Ctrl\>-u
 
 > Delete line.
diff --git a/doc/tofi.1.scd b/doc/tofi.1.scd
index 24e75b7..9f7ebe6 100644
--- a/doc/tofi.1.scd
+++ b/doc/tofi.1.scd
@@ -44,6 +44,12 @@ All config file options described in *tofi*(5) are also accepted, in the form
 <Down> | <Right> | <Ctrl>-j | <Tab>
 	Move the selection forward one entry.
 
+<Page Up>
+	Move the selection back one page.
+
+<Page Down>
+	Move the selection forward one page.
+
 <Ctrl>-u
 	Delete line.
 
diff --git a/src/input.c b/src/input.c
index be65e24..7f78c50 100644
--- a/src/input.c
+++ b/src/input.c
@@ -16,6 +16,8 @@ static void clear_input(struct tofi *tofi);
 static void paste(struct tofi *tofi);
 static void select_previous_result(struct tofi *tofi);
 static void select_next_result(struct tofi *tofi);
+static void select_previous_page(struct tofi *tofi);
+static void select_next_page(struct tofi *tofi);
 static void next_cursor_or_result(struct tofi *tofi);
 static void previous_cursor_or_result(struct tofi *tofi);
 static void reset_selection(struct tofi *tofi);
@@ -88,6 +90,10 @@ void input_handle_keypress(struct tofi *tofi, xkb_keycode_t keycode)
 		select_next_result(tofi);
 	} else if (sym == XKB_KEY_Home) {
 		reset_selection(tofi);
+	} else if (sym == XKB_KEY_Page_Up) {
+		select_previous_page(tofi);
+	} else if (sym == XKB_KEY_Page_Down) {
+		select_next_page(tofi);
 	} else if (sym == XKB_KEY_Escape
 			|| (key == KEY_C
 				&& xkb_state_mod_name_is_active(
@@ -335,3 +341,28 @@ void next_cursor_or_result(struct tofi *tofi)
 		select_next_result(tofi);
 	}
 }
+
+void select_previous_page(struct tofi *tofi)
+{
+	struct entry *entry = &tofi->window.entry;
+
+	if (entry->first_result >= entry->last_num_results_drawn) {
+		entry->first_result -= entry->last_num_results_drawn;
+	} else {
+		entry->first_result = 0;
+	}
+	entry->selection = 0;
+	entry->last_num_results_drawn = entry->num_results_drawn;
+}
+
+void select_next_page(struct tofi *tofi)
+{
+	struct entry *entry = &tofi->window.entry;
+
+	entry->first_result += entry->num_results_drawn;
+	if (entry->first_result >= entry->results.count) {
+		entry->first_result = 0;
+	}
+	entry->selection = 0;
+	entry->last_num_results_drawn = entry->num_results_drawn;
+}
-- 
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