summaryrefslogtreecommitdiffstats
path: root/qemu/roms/ipxe/src/hci/jumpscroll.c
diff options
context:
space:
mode:
authorDon Dugger <n0ano@n0ano.com>2016-06-03 03:33:22 +0000
committerGerrit Code Review <gerrit@172.30.200.206>2016-06-03 03:33:23 +0000
commitda27230f80795d0028333713f036d44c53cb0e68 (patch)
treeb3d379eaf000adf72b36cb01cdf4d79c3e3f064c /qemu/roms/ipxe/src/hci/jumpscroll.c
parent0e68cb048bb8aadb14675f5d4286d8ab2fc35449 (diff)
parent437fd90c0250dee670290f9b714253671a990160 (diff)
Merge "These changes are the raw update to qemu-2.6."
Diffstat (limited to 'qemu/roms/ipxe/src/hci/jumpscroll.c')
-rw-r--r--qemu/roms/ipxe/src/hci/jumpscroll.c140
1 files changed, 140 insertions, 0 deletions
diff --git a/qemu/roms/ipxe/src/hci/jumpscroll.c b/qemu/roms/ipxe/src/hci/jumpscroll.c
new file mode 100644
index 000000000..dd6bcac2b
--- /dev/null
+++ b/qemu/roms/ipxe/src/hci/jumpscroll.c
@@ -0,0 +1,140 @@
+/*
+ * Copyright (C) 2015 Michael Brown <mbrown@fensystems.co.uk>.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ *
+ * You can also choose to distribute this program under the terms of
+ * the Unmodified Binary Distribution Licence (as given in the file
+ * COPYING.UBDL), provided that you have satisfied its requirements.
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
+
+/**
+ * Jump scrolling
+ *
+ */
+
+#include <assert.h>
+#include <ipxe/keys.h>
+#include <ipxe/jumpscroll.h>
+
+/**
+ * Handle keypress
+ *
+ * @v scroll Jump scroller
+ * @v key Key pressed by user
+ * @ret move Scroller movement, or zero
+ */
+int jump_scroll_key ( struct jump_scroller *scroll, int key ) {
+
+ /* Sanity checks */
+ assert ( scroll->rows != 0 );
+ assert ( scroll->count != 0 );
+ assert ( scroll->current < scroll->count );
+ assert ( scroll->first < scroll->count );
+ assert ( scroll->first <= scroll->current );
+ assert ( scroll->current < ( scroll->first + scroll->rows ) );
+
+ /* Handle key, if applicable */
+ switch ( key ) {
+ case KEY_UP:
+ return -1;
+ case KEY_DOWN:
+ return +1;
+ case KEY_PPAGE:
+ return ( scroll->first - scroll->current - 1 );
+ case KEY_NPAGE:
+ return ( scroll->first - scroll->current + scroll->rows );
+ case KEY_HOME:
+ return -( scroll->count );
+ case KEY_END:
+ return +( scroll->count );
+ default:
+ return 0;
+ }
+}
+
+/**
+ * Move scroller
+ *
+ * @v scroll Jump scroller
+ * @v move Scroller movement
+ * @ret move Continuing scroller movement (if applicable)
+ */
+int jump_scroll_move ( struct jump_scroller *scroll, int move ) {
+ int current = scroll->current;
+ int last = ( scroll->count - 1 );
+
+ /* Sanity checks */
+ assert ( move != 0 );
+ assert ( scroll->count != 0 );
+
+ /* Move to the new current item */
+ current += move;
+
+ /* Check for start/end of list */
+ if ( current < 0 ) {
+ /* We have attempted to move before the start of the
+ * list. Move to the start of the list and continue
+ * moving forwards (if applicable).
+ */
+ scroll->current = 0;
+ return +1;
+ } else if ( current > last ) {
+ /* We have attempted to move after the end of the
+ * list. Move to the end of the list and continue
+ * moving backwards (if applicable).
+ */
+ scroll->current = last;
+ return -1;
+ } else {
+ /* Update the current item and continue moving in the
+ * same direction (if applicable).
+ */
+ scroll->current = current;
+ return ( ( move > 0 ) ? +1 : -1 );
+ }
+}
+
+/**
+ * Jump scroll to new page (if applicable)
+ *
+ * @v scroll Jump scroller
+ * @ret jumped Jumped to a new page
+ */
+int jump_scroll ( struct jump_scroller *scroll ) {
+ unsigned int index;
+
+ /* Sanity checks */
+ assert ( scroll->rows != 0 );
+ assert ( scroll->count != 0 );
+ assert ( scroll->current < scroll->count );
+ assert ( scroll->first < scroll->count );
+
+ /* Do nothing if we are already on the correct page */
+ index = ( scroll->current - scroll->first );
+ if ( index < scroll->rows )
+ return 0;
+
+ /* Move to required page */
+ while ( scroll->first < scroll->current )
+ scroll->first += scroll->rows;
+ while ( scroll->first > scroll->current )
+ scroll->first -= scroll->rows;
+
+ return 1;
+}