add simple text viewer to pluginlib and use this for dict to show description.

now dict can scroll the description. it might not show full description if it is too long or memory is not enough.


git-svn-id: svn://svn.rockbox.org/rockbox/trunk@26687 a1c6a512-1295-4272-9138-f99709370657

1 files changed, 260 insertions, 0 deletions

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;
+}