3 files changed, 289 insertions, 0 deletions

diff --git a/apps/plugins/lib/SOURCES b/apps/plugins/lib/SOURCES
index 8c160e1cc4..5ed163f951 100644
--- a/apps/plugins/lib/SOURCES
+++ b/apps/plugins/lib/SOURCES
@@ -9,6 +9,7 @@ fixedpoint.c
 playback_control.c
 rgb_hsv.c
 buflib.c
+simple_viewer.c
 display_text.c
 strncpy.c
 
diff --git a/apps/plugins/lib/simple_viewer.c b/apps/plugins/lib/simple_viewer.c
new file mode 100644
index 0000000000..c83f005ef4
--- /dev/null
+++ b/apps/plugins/lib/simple_viewer.c
@@ -0,0 +1,260 @@
+/***************************************************************************
+*             __________               __   ___.
+*   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+*   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+*   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+*   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+*                     \/            \/     \/    \/            \/
+* $Id$
+*
+* Copyright (C) 2010 Teruaki Kawashima
+*
+* 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 software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+* KIND, either express or implied.
+*
+****************************************************************************/
+
+#include "config.h"
+#include "plugin.h"
+#include "pluginlib_actions.h"
+#include "simple_viewer.h"
+#include <ctype.h>
+
+struct view_info {
+#ifdef HAVE_LCD_BITMAP
+    struct font* pf;
+#endif
+    const char *title;
+    const char *text;   /* displayed text */
+    int display_lines;  /* number of lines can be displayed */
+    int line_count;     /* number of lines */
+    int line;           /* current fisrt line */
+    int start;          /* possition of first line in text  */
+};
+
+static const char* get_next_line(const char *text, struct view_info *info)
+{
+    (void) info;
+    const char *ptr = text;
+    const char *space = NULL;
+    int total, n, w;
+    total = 0;
+    while(*ptr)
+    {
+#ifdef HAVE_LCD_CHARCELLS
+        n = rb->utf8seek(ptr, 1);
+        w = 1;
+#else
+        unsigned short ch;
+        n = ((long)rb->utf8decode(ptr, &ch) - (long)ptr);
+        w = rb->font_get_width(info->pf, ch);
+#endif
+        if (isspace(*ptr))
+            space = ptr+n;
+        if (*ptr == '\n')
+        {
+            ptr += n;
+            break;
+        }
+        if (total + w > LCD_WIDTH)
+            break;
+        ptr += n;
+        total += w;
+    }
+    return *ptr && space? space: ptr;
+}
+
+static void calc_line_count(struct view_info *info)
+{
+    const char *ptr = info->text;
+    int i = 0;
+
+    while (*ptr)
+    {
+        ptr = get_next_line(ptr, info);
+        i++;
+    }
+    info->line_count = i;
+}
+
+static void calc_first_line(struct view_info *info, int line)
+{
+    const char *ptr = info->text;
+    int i = 0;
+
+    if (line > info->line_count - info->display_lines)
+        line = info->line_count - info->display_lines;
+    if (line < 0)
+        line = 0;
+
+    DEBUGF("%d -> %d\n", info->line, line);
+    if (info->line <= line)
+    {
+        ptr += info->start;
+        i = info->line;
+    }
+    while (*ptr && i < line)
+    {
+        ptr = get_next_line(ptr, info);
+        i++;
+    }
+    info->start = ptr - info->text;
+    info->line = i;
+    DEBUGF("%d: %d\n", info->line, info->start);
+}
+
+static int init_view(struct view_info *info,
+                     const char *title, const char *text)
+{
+#ifdef HAVE_LCD_BITMAP
+    info->pf = rb->font_get(FONT_UI);
+    info->display_lines = LCD_HEIGHT / info->pf->height;
+#else
+
+    info->display_lines = LCD_HEIGHT;
+#endif
+
+    info->title = title;
+    info->text = text;
+    info->line_count = 0;
+    info->line = 0;
+    info->start = 0;
+
+    /* no title for small screens. */
+    if (info->display_lines < 4)
+    {
+        info->title = NULL;
+    }
+    else
+    {
+        info->display_lines--;
+    }
+
+    calc_line_count(info);
+    return 0;
+}
+
+static void draw_text(struct view_info *info)
+{
+#ifdef HAVE_LCD_BITMAP
+#define OUTPUT_SIZE LCD_WIDTH+1
+#else
+#define OUTPUT_SIZE LCD_WIDTH*3+1
+#endif
+    static char output[OUTPUT_SIZE];
+    const char *text, *ptr;
+    int i, max_show, lines = 0;
+
+    /* clear screen */
+    rb->lcd_clear_display();
+
+    /* display title. */
+    if(info->title)
+    {
+        rb->lcd_puts(0, lines, info->title);
+        lines++;
+    }
+
+    max_show = MIN(info->line_count - info->line, info->display_lines);
+    DEBUGF("draw_text: %d-%d/%d\n",
+           info->line, info->line + max_show, info->line_count);
+    text = info->text + info->start;
+
+    for (i = 0; i < max_show; i++, lines++)
+    {
+        ptr = get_next_line(text, info);
+        DEBUGF("%d>%d-%d, ", i, text-info->text, ptr-text);
+        rb->strlcpy(output, text, ptr-text+1);
+        rb->lcd_puts(0, lines, output);
+        text = ptr;
+    }
+    DEBUGF("\n");
+
+    rb->lcd_update();
+}
+
+static void scroll_up(struct view_info *info)
+{
+    if (info->line <= 0)
+        return;
+    calc_first_line(info, info->line-1);
+    draw_text(info);
+    return;
+}
+
+static void scroll_down(struct view_info *info)
+{
+    if (info->line + info->display_lines >= info->line_count)
+        return;
+
+    calc_first_line(info, info->line+1);
+    draw_text(info);
+}
+
+static void scroll_to_top(struct view_info *info)
+{
+    if (info->line <= 0)
+        return;
+
+    calc_first_line(info, 0);
+    draw_text(info);
+}
+
+static void scroll_to_bottom(struct view_info *info)
+{
+    if (info->line + info->display_lines >= info->line_count)
+        return;
+
+    calc_first_line(info, info->line_count - info->display_lines);
+    draw_text(info);
+}
+
+int view_text(const char *title, const char *text)
+{
+    struct view_info info;
+    const struct button_mapping *view_contexts[] = {
+        pla_main_ctx,
+    };
+    int button;
+
+    init_view(&info, title, text);
+    draw_text(&info);
+
+    /* wait for keypress */
+    while(1)
+    {
+        button = pluginlib_getaction(TIMEOUT_BLOCK, view_contexts,
+                                     ARRAYLEN(view_contexts));
+        switch (button)
+        {
+        case PLA_UP:
+        case PLA_UP_REPEAT:
+            scroll_up(&info);
+            break;
+        case PLA_DOWN:
+        case PLA_DOWN_REPEAT:
+            scroll_down(&info);
+            break;
+        case PLA_LEFT_REPEAT:
+            scroll_to_top(&info);
+            break;
+        case PLA_RIGHT_REPEAT:
+            scroll_to_bottom(&info);
+            break;
+        case PLA_EXIT:
+        case PLA_CANCEL:
+            return PLUGIN_OK;
+        default:
+            if (rb->default_event_handler(button) == SYS_USB_CONNECTED)
+                return PLUGIN_USB_CONNECTED;
+            break;
+        }
+   }
+
+    return PLUGIN_OK;
+}
diff --git a/apps/plugins/lib/simple_viewer.h b/apps/plugins/lib/simple_viewer.h
new file mode 100644
index 0000000000..ff3ef23f14
--- /dev/null
+++ b/apps/plugins/lib/simple_viewer.h
@@ -0,0 +1,28 @@
+/***************************************************************************
+*             __________               __   ___.
+*   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+*   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+*   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+*   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+*                     \/            \/     \/    \/            \/
+* $Id$
+*
+* Copyright (C) 2010 Teruaki Kawashima
+*
+* 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 software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+* KIND, either express or implied.
+*
+****************************************************************************/
+
+#ifndef __PLUGINLIB_VIEWER_H__
+#define __PLUGINLIB_VIEWER_H__
+
+#include "plugin.h"
+int view_text(const char *title, const char *text);
+
+#endif /*  __PLUGINLIB_VIEWER_H__ */