[ghex] HexWidget: Implement Home and End keybindings

[Logan Rathbone <larathbone src gnome org>]

commit c068c618d760a68a63bbfe9642aaffdf6fe8d624
Author: Logan Rathbone <poprocks gmail com>
Date:   Thu Dec 30 09:33:38 2021 -0500

    HexWidget: Implement Home and End keybindings

 src/gtkhex.c | 44 +++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 39 insertions(+), 5 deletions(-)
---
diff --git a/src/gtkhex.c b/src/gtkhex.c
index 9aa5a09..9e9f228 100644
--- a/src/gtkhex.c
+++ b/src/gtkhex.c
@@ -1601,11 +1601,6 @@ key_press_cb (GtkEventControllerKey *controller,
 
        payload_size = HEX_BUFFER_PAYLOAD (self->document);
 
-       /* don't trample over Ctrl or Alt (reserved for actions) */
-       if (state & GDK_CONTROL_MASK || state & GDK_ALT_MASK) {
-               return FALSE;
-       }
-
        show_cursor (self, FALSE);
 
        /* Figure out if we're holding shift or not. */
@@ -1659,7 +1654,46 @@ key_press_cb (GtkEventControllerKey *controller,
                        ret = GDK_EVENT_STOP;
                        break;
 
+               case GDK_KEY_Home:
+                       if (state & GDK_CONTROL_MASK)
+                       {
+                               hex_widget_set_cursor (self, 0);
+                       }
+                       else
+                       {
+                               gint64 line_beg = self->cursor_pos; 
+
+                               while (line_beg % self->cpl != 0)
+                                       --line_beg;
+
+                               hex_widget_set_cursor (self, line_beg);
+                       }
+                       ret = GDK_EVENT_STOP;
+                       break;
+
+               case GDK_KEY_End:
+                       if (state & GDK_CONTROL_MASK)
+                       {
+                               hex_widget_set_cursor (self, payload_size);
+                       }
+                       else
+                       {
+                               gint64 line_end = self->cursor_pos; 
+
+                               while (line_end % self->cpl != self->cpl - 1)
+                                       ++line_end;
+
+                               hex_widget_set_cursor (self, MIN (line_end, payload_size));
+                       }
+                       ret = GDK_EVENT_STOP;
+                       break;
+
                default:
+                       /* don't trample over Ctrl or Alt (reserved for actions) */
+                       if (state & GDK_CONTROL_MASK || state & GDK_ALT_MASK) {
+                               return FALSE;
+                       }
+
                        if (self->active_view == VIEW_HEX)
                        {
                                switch(keyval)