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/*
 * e-text.h - Text item for evolution.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with the program; if not, see <http://www.gnu.org/licenses/>
 *
 *
 * Authors:
 *      Chris Lahey <clahey@ximian.com>
 *      Jon Trowbridge <trow@ximian.com>
 *
 * A majority of code taken from:
 *
 * Text item type for GnomeCanvas widget
 *
 * GnomeCanvas is basically a port of the Tk toolkit's most excellent
 * canvas widget.  Tk is copyrighted by the Regents of the University
 * of California, Sun Microsystems, and other parties.
 *
 * Copyright (C) 1998 The Free Software Foundation
 *
 * Author: Federico Mena <federico@nuclecu.unam.mx>
 *
 * Copyright (C) 1999-2008 Novell, Inc. (www.novell.com)
 *
 */

#ifndef E_TEXT_H
#define E_TEXT_H

#include <gtk/gtk.h>

#include <e-util/e-text-event-processor.h>
#include <text/e-text-model.h>
#include <misc/e-canvas.h>

G_BEGIN_DECLS

/* Text item for the canvas.  Text items are positioned by an anchor point and an anchor direction.
 *
 * A clipping rectangle may be specified for the text.  The rectangle is anchored at the text's anchor
 * point, and is specified by clipping width and height parameters.  If the clipping rectangle is
 * enabled, it will clip the text.
 *
 * In addition, x and y offset values may be specified.  These specify an offset from the anchor
 * position.  If used in conjunction with the clipping rectangle, these could be used to implement
 * simple scrolling of the text within the clipping rectangle.
 *
 * The following object arguments are available:
 *
 * name         type            read/write  description
 * ------------------------------------------------------------------------------------------
 * text         string          RW      The string of the text label
 * bold                 boolean                 RW              Bold?
 * anchor       GtkAnchorType       RW      Anchor side for the text
 * justification    GtkJustification    RW      Justification for multiline text
 * fill_color       string          W       X color specification for text
 * fill_color_gdk   GdkColor*       RW      Pointer to an allocated GdkColor
 * fill_stipple     GdkBitmap*      RW      Stipple pattern for filling the text
 * clip_width       gdouble         RW      Width of clip rectangle
 * clip_height      gdouble         RW      Height of clip rectangle
 * clip         boolean         RW      Use clipping rectangle?
 * fill_clip_rect       boolean                 RW              Whether the text item represents itself as being the size of the clipping rectangle.
 * x_offset     gdouble         RW      Horizontal offset distance from anchor position
 * y_offset     gdouble         RW      Vertical offset distance from anchor position
 * text_width       gdouble         R       Used to query the width of the rendered text
 * text_height      gdouble         R       Used to query the rendered height of the text
 * width                gdouble                  RW              A synonym for clip_width
 * height               gdouble                  R               A synonym for text_height
 *
 * These are currently ignored in the AA version:
 * editable             boolean                 RW              Can this item be edited
 * use_ellipsis         boolean                 RW              Whether to use ellipsises if text gets cut off.  Meaningless if clip == false.
 * ellipsis             string                  RW              The characters to use as ellipsis.  NULL = "...".
 * line_wrap            boolean                 RW              Line wrap when not editing.
 * break_characters     string                  RW              List of characters to optionally break on.
 * max_lines            gint                     RW              Number of lines possible when doing line wrap.
 * draw_borders         boolean                 RW              Whether to draw borders.
 * draw_background      boolean                 RW              Whether to draw the background.
 * draw_button          boolean                 RW              This makes EText handle being the child of a button properly and highlighting as it should.
 */

#define E_TYPE_TEXT            (e_text_get_type ())
#define E_TEXT(obj)            (G_TYPE_CHECK_INSTANCE_CAST ((obj), E_TYPE_TEXT, EText))
#define E_TEXT_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST ((klass), E_TYPE_TEXT, ETextClass))
#define E_IS_TEXT(obj)         (G_TYPE_CHECK_INSTANCE_TYPE ((obj), E_TYPE_TEXT))
#define E_IS_TEXT_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), E_TYPE_TEXT))

typedef struct _EText EText;
typedef struct _ETextClass ETextClass;

struct _EText {
    GnomeCanvasItem item;

    ETextModel *model;
    gint model_changed_signal_id;
    gint model_repos_signal_id;

    const gchar *text;              /* Text to display --- from the ETextModel */
    gint preedit_len;       /* preedit length to display */
    gint preedit_pos;       /* preedit cursor position */
    PangoLayout *layout;
    gint num_lines;         /* Number of lines of text */

    gchar *revert;                  /* Text to revert to */

    GtkAnchorType anchor;       /* Anchor side for text */
    GtkJustification justification; /* Justification for text */

    gdouble clip_width;     /* Width of optional clip rectangle */
    gdouble clip_height;        /* Height of optional clip rectangle */

    gdouble xofs, yofs;     /* Text offset distance from anchor position */

    GdkColor color;     /* Fill color */
    GdkBitmap *stipple;     /* Stipple for text */
    GdkGC *gc;          /* GC for drawing text */

    gint cx, cy;            /* Top-left canvas coordinates for text */
    gint text_cx, text_cy;      /* Top-left canvas coordinates for text */
    gint clip_cx, clip_cy;      /* Top-left canvas coordinates for clip rectangle */
    gint clip_cwidth, clip_cheight; /* Size of clip rectangle in pixels */
    gint max_width;         /* Maximum width of text lines */
    gint width;                      /* Rendered text width in pixels */
    gint height;            /* Rendered text height in pixels */

    guint32 rgba;           /* RGBA color for text */
    gdouble affine[6];               /* The item -> canvas affine */

    gchar *ellipsis;                 /* The ellipsis characters.  NULL = "...". */
    gdouble ellipsis_width;          /* The width of the ellipsis. */

    gint xofs_edit;                  /* Offset because of editing */
    gint yofs_edit;                  /* Offset because of editing */

    /* This needs to be reworked a bit once we get line wrapping. */
    gint selection_start;            /* Start of selection IN BYTES */
    gint selection_end;              /* End of selection IN BYTES */
    gboolean select_by_word;        /* Current selection is by word */

    /* This section is for drag scrolling and blinking cursor. */
    gint timeout_id;                /* Current timeout id for scrolling */
    GTimer *timer;                  /* Timer for blinking cursor and scrolling */

    gint lastx, lasty;              /* Last x and y motion events */
    gint last_state;                /* Last state */
    gulong scroll_start;            /* Starting time for scroll (microseconds) */

    gint show_cursor;               /* Is cursor currently shown */
    gboolean button_down;           /* Is mouse button 1 down */

    ETextEventProcessor *tep;       /* Text Event Processor */
    gint tep_command_id;

    gboolean has_selection;         /* TRUE if we have the selection */

    guint clip : 1;         /* Use clip rectangle? */
    guint fill_clip_rectangle : 1;  /* Fill the clipping rectangle. */

    guint pointer_in : 1;           /* Is the pointer currently over us? */
    guint default_cursor_shown : 1; /* Is the default cursor currently shown? */
    guint draw_borders : 1;         /* Draw borders? */
    guint draw_background : 1;      /* Draw background? */
    guint draw_button : 1;          /* Draw button? */

    guint line_wrap : 1;            /* Do line wrap */

    guint needs_redraw : 1;         /* Needs redraw */
    guint needs_recalc_bounds : 1;  /* Need recalc_bounds */
    guint needs_calc_height : 1;    /* Need calc_height */
    guint needs_split_into_lines : 1; /* Needs split_into_lines */
    guint needs_reset_layout : 1; /* Needs split_into_lines */

    guint bold : 1;
    guint strikeout : 1;

    guint tooltip_owner : 1;
    guint allow_newlines : 1;

    guint use_ellipsis : 1;         /* Whether to use the ellipsis. */

    guint editable : 1;             /* Item is editable */
    guint editing : 1;              /* Item is currently being edited */

    gchar *break_characters;        /* Characters to optionally break after */

    gint max_lines;                 /* Max number of lines (-1 = infinite) */

    GdkCursor *default_cursor;      /* Default cursor (arrow) */
    GdkCursor *i_cursor;            /* I beam cursor */

    gint tooltip_timeout;           /* Timeout for the tooltip */
    gint tooltip_count;             /* GDK_ENTER_NOTIFY count. */

    gint dbl_timeout;               /* Double click timeout */
    gint tpl_timeout;               /* Triple click timeout */

    gint     last_type_request;       /* Last selection type requested. */
    guint32  last_time_request;       /* The time of the last selection request. */
    GdkAtom  last_selection_request;  /* The time of the last selection request. */
    GList   *queued_requests;         /* Queued selection requests. */

    GtkIMContext *im_context;
    gboolean      need_im_reset;
    gboolean      im_context_signals_registered;

    gboolean      handle_popup;

    PangoFontDescription *font_desc;
};

struct _ETextClass {
    GnomeCanvasItemClass parent_class;

    void (* changed)         (EText *text);
    void (* activate)        (EText *text);
    void (* keypress)        (EText *text, guint keyval, guint state);
    void (* populate_popup)  (EText *text, GdkEventButton *ev, gint pos, GtkMenu *menu);
    void (* style_set)       (EText *text, GtkStyle *previous_style);
};

/* Standard Gtk function */
GType    e_text_get_type        (void);
void     e_text_cancel_editing  (EText *text);
void     e_text_stop_editing    (EText *text);

void     e_text_delete_selection (EText *text);
void     e_text_cut_clipboard    (EText *text);
void     e_text_copy_clipboard   (EText *text);
void     e_text_paste_clipboard  (EText *text);
void     e_text_select_all       (EText *text);

G_END_DECLS

#endif