From a61192c3149faf2d024e80ee603c6047984d4512 Mon Sep 17 00:00:00 2001
From: Moritz Lipp <mlq@pwmt.org>
Date: Mon, 14 Jun 2010 17:13:18 +0200
Subject: [PATCH] Introduced page-wise scrolling

It is now possible to scroll one page or an half page up or down.
---
 config.def.h |  4 ++++
 zathura.1    | 12 ++++++++++++
 zathura.c    | 11 ++++++++++-
 3 files changed, 26 insertions(+), 1 deletion(-)

diff --git a/config.def.h b/config.def.h
index bd48a9e..d44425f 100644
--- a/config.def.h
+++ b/config.def.h
@@ -69,6 +69,10 @@ Shortcut shortcuts[] = {
   {GDK_CONTROL_MASK,   GDK_q,             sc_quit,              -1,         {0} },
   {GDK_CONTROL_MASK,   GDK_c,             sc_abort,             -1,         {0} },
   {GDK_CONTROL_MASK,   GDK_i,             sc_recolor,           NORMAL,     {0} },
+  {GDK_CONTROL_MASK,   GDK_d,             sc_scroll,            NORMAL,     { HALF_DOWN } },
+  {GDK_CONTROL_MASK,   GDK_u,             sc_scroll,            NORMAL,     { HALF_UP } },
+  {GDK_CONTROL_MASK,   GDK_f,             sc_scroll,            NORMAL,     { FULL_DOWN } },
+  {GDK_CONTROL_MASK,   GDK_b,             sc_scroll,            NORMAL,     { FULL_UP } },
   {0,                  GDK_slash,         sc_focus_inputbar,    NORMAL,     { .data = "/" } },
   {GDK_SHIFT_MASK,     GDK_slash,         sc_focus_inputbar,    NORMAL,     { .data = "/" } },
   {GDK_SHIFT_MASK,     GDK_question,      sc_focus_inputbar,    NORMAL,     { .data = "?" } },
diff --git a/zathura.1 b/zathura.1
index 4646e78..52d690e 100644
--- a/zathura.1
+++ b/zathura.1
@@ -27,6 +27,18 @@ Scroll upwards
 .B j
 Scroll downwards
 .TP
+.B ^f
+Scroll page down
+.TP
+.B ^b
+Scroll page up
+.TP
+.B ^d
+Scroll half a page down
+.TP
+.B ^u
+Scroll half a page up
+.TP
 .B l
 Scroll to the right
 .TP
diff --git a/zathura.c b/zathura.c
index fde3b0d..4eddd03 100644
--- a/zathura.c
+++ b/zathura.c
@@ -27,7 +27,8 @@ enum { NEXT, PREVIOUS, LEFT, RIGHT, UP, DOWN,
        FORWARD, BACKWARD, ADJUST_BESTFIT, ADJUST_WIDTH,
        ADJUST_NONE, CONTINUOUS, DELETE_LAST, ADD_MARKER,
        EVAL_MARKER, INDEX, EXPAND, COLLAPSE, SELECT,
-       GOTO_DEFAULT, GOTO_LABELS, GOTO_OFFSET, FULLSCREEN };
+       GOTO_DEFAULT, GOTO_LABELS, GOTO_OFFSET, FULLSCREEN,
+       HALF_UP, HALF_DOWN, FULL_UP, FULL_DOWN };
 
 /* typedefs */
 struct CElement
@@ -1615,6 +1616,14 @@ sc_scroll(Argument* argument)
     arg.n = NEXT;
     sc_navigate(&arg);
   }
+  else if(argument->n == FULL_UP)
+    gtk_adjustment_set_value(adjustment, (value - view_size) < 0 ? 0 : (value - view_size));
+  else if(argument->n == FULL_DOWN)
+    gtk_adjustment_set_value(adjustment, (value + view_size) > max ? max : (value + view_size));
+  else if(argument->n == HALF_UP)
+    gtk_adjustment_set_value(adjustment, (value - (view_size / 2)) < 0 ? 0 : (value - (view_size / 2)));
+  else if(argument->n == HALF_DOWN)
+    gtk_adjustment_set_value(adjustment, (value + (view_size / 2)) > max ? max : (value + (view_size / 2)));
   else if((argument->n == LEFT) || (argument->n == UP))
     gtk_adjustment_set_value(adjustment, (value - SCROLL_STEP) < 0 ? 0 : (value - SCROLL_STEP));
   else if(argument->n == TOP)