text viewer: reworks screen access logics and some bugs fix.

- screen access logics separte from tv_window. (new tv_display.[ch])
- using multi screen api.
- (bug fix) the head of the each line is not normally displayed when the alignment is RIGHT.
- (bug fix) unnecessary blank line is not displayed. (a part of FS#11400).
- (bug fix) the order by which callback functions were called was not correct. (FIFO->FILO)

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@27138 a1c6a512-1295-4272-9138-f99709370657

apps/plugins/text_viewer/tv_display.h

@@ -0,0 +1,175 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2010 Yoshihisa Uchida
+ *
+ * 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 PLUGIN_TEXT_VIEWER_DISPLAY_H
+#define PLUGIN_TEXT_VIEWER_DISPLAY_H
+
+#include "plugin.h"
+#include "tv_screen_pos.h"
+
+/* text viewer layout parts functions */
+#ifdef HAVE_LCD_BITMAP
+
+/* show headaer */
+void tv_show_header(void);
+
+/*
+ * show footer
+ *
+ * [In] pos
+ *       the current position
+ */
+void tv_show_footer(const struct tv_screen_pos *pos);
+
+/*
+ * initialize the scrollbar
+ *
+ * [In] total
+ *          total text size
+ *
+ * [In] show_scrollbar
+ *          true:  show the vertical scrollbar
+ *          false: does not show the vertical scrollbar
+ */
+void tv_init_scrollbar(off_t total, bool show_scrollbar);
+
+/*
+ * show horizontal/vertical scrollbar
+ *
+ * [In] window
+ *          the current window
+ *
+ * [In] col
+ *          the current column
+ *
+ * [In] cur_pos
+ *          the current text position
+ *
+ * [In] size
+ *          the size of text in displayed.
+ */
+void tv_show_scrollbar(int window, int col, off_t cur_pos, int size);
+
+#else
+
+/*
+ * put the bookmark icon
+ *
+ * [In] row
+ *          the row where the bookmark icon is put
+ */
+void tv_put_bookmark_icon(int row);
+
+#endif
+
+/* common display functons */
+
+/* initialized display functions */
+void tv_init_display(void);
+
+/* start the display processing  */
+void tv_start_display(void);
+
+/* end the display processing */
+void tv_end_display(void);
+
+/* clear the display */
+void tv_clear_display(void);
+
+/*update the display  */
+void tv_update_display(void);
+
+#ifdef HAVE_LCD_BITMAP
+
+/*
+ * set the drawmode
+ *
+ * [In] mode
+ *          new drawmode
+ */
+void tv_set_drawmode(int mode);
+
+/*
+ * draw the rectangle that paints out inside
+ *
+ * [In] col
+ *          the column of the upper left
+ *
+ * [In] row
+ *          the row of the upper left
+ *
+ * [In] row
+ *          draw rows
+ */
+void tv_fillrect(int col, int row, int rows);
+
+#endif
+
+/*
+ * draw the text
+ *
+ * [In] row
+ *          the row that displays the text
+ *
+ * [In] text
+ *          text
+ *
+ * [In] offset
+ *          display the text that is since offset columns
+ */
+void tv_draw_text(int row, const unsigned char *text, int offset);
+
+/* layout functions */
+#ifdef HAVE_LCD_BITMAP
+
+/*
+ * set the layout
+ *
+ * [In] col_w
+ *          width per column
+ *
+ * [In] show_scrollbar
+ *          true:  show the vertical scrollbar
+ *          false: does not show the vertical scrollbar
+ */
+void tv_set_layout(int col_w, bool show_scrollbar);
+
+#else
+
+/*
+ * set the layout
+ *
+ * [In] col_w
+ *          width per column
+ */
+void tv_set_layout(int col_w);
+
+#endif
+void tv_get_drawarea_info(int *width, int *cols, int *rows);
+
+/* viewport functions */
+
+/* change the viewport */
+void tv_change_viewport(void);
+
+/* undo the viewport */
+void tv_undo_viewport(void);
+
+#endif