Initial multi screen support by Kévin Ferrare (Patch #1318081)

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@7666 a1c6a512-1295-4272-9138-f99709370657

1 files changed, 106 insertions, 0 deletions

diff --git a/apps/gui/scrollbar.c b/apps/gui/scrollbar.c
new file mode 100644
index 0000000..9d5717f
--- /dev/null
+++ b/apps/gui/scrollbar.c
@@ -0,0 +1,106 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) Markus Braun (2002), Kévin FERRARE (2005)
+ *
+ * All files in this archive are subject to the GNU General Public License.
+ * See the file COPYING in the source tree root for full license agreement.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+
+#include "config.h"
+#include "lcd.h"
+#ifdef HAVE_LCD_BITMAP
+#include "limits.h"
+#include "scrollbar.h"
+#include "screen_access.h"
+
+void gui_scrollbar_draw(struct screen * screen, int x, int y,
+                        int width, int height, int items,
+                        int min_shown, int max_shown,
+                        enum orientation orientation)
+{
+    int min;
+    int max;
+    int inner_len;
+    int start;
+    int size;
+
+    /* draw box */
+    screen->drawrect(x, y, width, height);
+
+    screen->set_drawmode(DRMODE_SOLID|DRMODE_INVERSEVID);
+
+    /* clear edge pixels */
+    screen->drawpixel(x, y);
+    screen->drawpixel((x + width - 1), y);
+    screen->drawpixel(x, (y + height - 1));
+    screen->drawpixel((x + width - 1), (y + height - 1));
+
+    /* clear pixels in progress bar */
+    screen->fillrect(x + 1, y + 1, width - 2, height - 2);
+
+    /* min should be min */
+    if(min_shown < max_shown) {
+        min = min_shown;
+        max = max_shown;
+    }
+    else {
+        min = max_shown;
+        max = min_shown;
+    }
+
+    /* limit min and max */
+    if(min < 0)
+        min = 0;
+    if(min > items)
+        min = items;
+
+    if(max < 0)
+        max = 0;
+    if(max > items)
+        max = items;
+
+    if (orientation == VERTICAL)
+        inner_len = height - 2;
+    else
+        inner_len = width - 2;
+
+    /* avoid overflows */
+    while (items > (INT_MAX / inner_len)) {
+        items >>= 1;
+        min >>= 1;
+        max >>= 1;
+    }
+
+    /* calc start and end of the knob */
+    if (items > 0 && items > (max - min)) {
+        size = inner_len * (max - min) / items;
+        if (size == 0) { /* width of knob is null */
+            size = 1;
+            start = (inner_len - 1) * min / items;
+        } else {
+            start = (inner_len - size) * min / (items - (max - min));
+        }
+    } else {  /* if null draw full bar */
+        size = inner_len;
+        start = 0;
+    }
+
+    screen->set_drawmode(DRMODE_SOLID);
+
+    if(orientation == VERTICAL)
+        screen->fillrect(x + 1, y + start + 1, width - 2, size);
+    else
+        screen->fillrect(x + start + 1, y + 1, size, height - 2);
+}
+#endif /* HAVE_LCD_BITMAP */