dw_page.c

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/*
 * File: dw_page.c
 *
 * Copyright (C) 1997       Raph Levien <[e-mail]>
 * Copyright (C) 1999       Luca Rota <[e-mail]>
 * Copyright (C) 2001-2003  Sebastian Geerken <[e-mail]>
 *
 * 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 module contains the Dw_page widget, which is the "back end" to
 * Web text widgets including html.
 */

#include <ctype.h>
#include <string.h>
#include <stdio.h>

#include <gtk/gtk.h>

#include "msg.h"
#include "list.h"
#include "dw_page.h"
#include "dw_marshal.h"
#include "dw_gtk_viewport.h"

#include "prefs.h"

#define DEBUG_REWRAP_LEVEL    0
#define DEBUG_SIZE_LEVEL     10
#define DEBUG_EVENT_LEVEL     0
#define DEBUG_ITERATOR_LEVEL  0

/*#define DEBUG_LEVEL 10*/
#include "debug.h"

#define MAX3(a, b, c) (MAX (a, MAX (b, c)))

static void Dw_page_init          (DwPage *page);
static void Dw_page_class_init    (DwPageClass *klass);

static void Dw_page_destroy       (GtkObject *object);

static void Dw_page_size_request      (DwWidget *widget,
                                      DwRequisition *requisition);
static void Dw_page_get_extremes      (DwWidget *widget,
                                       DwExtremes *extremes);
static void Dw_page_size_allocate     (DwWidget *widget,
                                       DwAllocation *allocation);
static void Dw_page_mark_change       (DwWidget *widget,
                                       gint ref);
static void Dw_page_set_width         (DwWidget *widget,
                                       gint32 width);
static void Dw_page_set_ascent        (DwWidget *widget,
                                       gint32 ascent);
static void Dw_page_set_descent       (DwWidget *widget,
                                       gint32 descent);
static void Dw_page_draw              (DwWidget *page,
                                       DwRectangle *area,
                                       GdkEventExpose *event);
static gboolean Dw_page_button_press  (DwWidget *widget,
                                       gint32 x,
                                       gint32 y,
                                       GdkEventButton *event);
static gboolean Dw_page_button_release(DwWidget *widget,
                                       gint32 x,
                                       gint32 y,
                                       GdkEventButton *event);
static gboolean Dw_page_motion_notify (DwWidget *widget,
                                       gint32 x,
                                       gint32 y,
                                       GdkEventMotion *event);
static gboolean Dw_page_leave_notify  (DwWidget *widget,
                                       DwWidget *next_widget,
                                       GdkEventMotion *event);


static void Dw_page_add               (DwContainer *container,
                                       DwWidget *widget);
static void Dw_page_remove            (DwContainer *container,
                                       DwWidget *widget);
static void Dw_page_forall            (DwContainer *container,
                                       DwCallback callback,
                                       gpointer callback_data);
static void Dw_page_real_word_wrap    (DwPage *page,
                                       gint word_ind);

static DwIterator* Dw_page_iterator               (DwWidget *widget,
                                                   gint mask,
                                                   gboolean at_end);
static gboolean    Dw_page_iterator_next          (DwIterator *it);
static gboolean    Dw_page_iterator_prev          (DwIterator *it);
static void        Dw_page_iterator_highlight      (DwIterator *it,
                                                    gint start,
                                                    gint end,
                                                    DwHighlightLayer layer);
static void        Dw_page_iterator_get_allocation (DwIterator *it,
                                                    gint start,
                                                    gint end,
                                                    DwAllocation *allocation);

static void Dw_page_rewrap            (DwPage *page);

/*
 * Returns the x offset (the indentation plus any offset needed for
 * centering or right justification) for the line. The offset returned
 * is relative to the page *content* (i.e. without border etc.).
 */
#define Dw_page_line_x_offset(page, line) \
   ( (page)->inner_padding + (line)->left_offset + \
     ((line) == (page)->lines ? (page)->line1_offset_eff : 0) )

/*
 * Like Dw_style_box_offset_x, but relative to the allocation (i.e.
 * including border etc.).
 */
#define Dw_page_line_total_x_offset(page, line) \
   ( Dw_page_line_x_offset (page, line) + \
     p_Dw_style_box_offset_x (((DwWidget*)(page))->style) )

/*
 * Returns the y offset (within the widget) of a line.
 */
#define Dw_page_line_total_y_offset(page, line) \
   Dw_page_line_total_y_offset_allocation(page, line, \
                                          &((DwWidget*)(page))->allocation)

/*
 * Like Dw_page_line_total_y_offset, but with the allocation as parameter.
 */
#define Dw_page_line_total_y_offset_allocation(page, line, allocation) \
   ( (allocation)->ascent - (page)->lines[0].ascent + (line)->top )

/*
 * Similar to Dw_page_line_total_y_offset.
 */
#define Dw_page_line_total_y_offset_i(page, line_index) \
   Dw_page_line_total_y_offset(page, &(page)->lines[line_index])

#define Dw_page_word_wrap(page, word_ind) \
   (((DwPageClass*)(((GtkObject*)(page))->klass))->word_wrap (page, word_ind))

enum
{
   LINK_ENTERED,
   LINK_PRESSED,
   LINK_RELEASED,
   LINK_CLICKED,
   LAST_SIGNAL
};

static DwContainerClass *parent_class;
static guint page_signals[LAST_SIGNAL] = { 0 };


/*
 * Return the type of DwPage
 */
GtkType a_Dw_page_get_type (void)
{
   static GtkType type = 0;

   if (!type) {
      GtkTypeInfo info = {
         "DwPage",
         sizeof (DwPage),
         sizeof (DwPageClass),
         (GtkClassInitFunc) Dw_page_class_init,
         (GtkObjectInitFunc) Dw_page_init,
         (GtkArgSetFunc) NULL,
         (GtkArgGetFunc) NULL,
         (GtkClassInitFunc) NULL
      };

      type = gtk_type_unique (DW_TYPE_CONTAINER, &info);
   }

   return type;
}


/*
 * Create a new DwPage
 */
DwWidget* a_Dw_page_new (void)
{
   GtkObject *object;

   object = gtk_object_new (DW_TYPE_PAGE, NULL);
   DBG_OBJ_CREATE (object, "DwPage");
   return DW_WIDGET (object);
}


/*
 * Initialize a DwPage
 */
static void Dw_page_init (DwPage *page)
{
   DW_WIDGET_SET_FLAGS (page, DW_USES_HINTS);

   page->list_item = FALSE;
   page->inner_padding = 0;
   page->line1_offset = 0;
   page->line1_offset_eff = 0;
   page->ignore_line1_offset_sometimes = FALSE;

   /*
    * The initial sizes of page->lines and page->words should not be
    * too high, since this will waste much memory with tables
    * containing many small cells. The few more calls to realloc
    * should not decrease the speed considerably.
    * (Current setting is for minimal memory usage. An interesting fact
    * is that high values decrease speed due to memory handling overhead!)
    * todo: Some tests would be useful.
    */
   page->num_lines_max = 1; /* 2 */
   page->num_lines = 0;
   page->lines = NULL;      /* g_new(DwPageLine, page->num_lines_max); */

   DBG_OBJ_SET_NUM(page, "num_lines", page->num_lines);

   page->num_words_max = 1; /* 8 */
   page->num_words = 0;
   page->words = NULL;      /* g_new(DwPageWord, page->num_words_max); */

   page->last_line_width = 0;
   page->last_line_par_min = 0;
   page->last_line_par_max = 0;
   page->wrap_ref = -1;

   DBG_OBJ_SET_NUM(page, "last_line_width", page->last_line_width);
   DBG_OBJ_SET_NUM(page, "last_line_par_min", page->last_line_par_min);
   DBG_OBJ_SET_NUM(page, "last_line_par_max", page->last_line_par_max);
   DBG_OBJ_SET_NUM(page, "wrap_ref", page->wrap_ref);

   page->hover_link = -1;

   /* random values */
   page->avail_width = 100;
   page->avail_ascent = 100;
   page->avail_descent = 0;

   page->hover_tooltip = NULL;
}

/*
 * Initialize the DwPage's class
 */
static void Dw_page_class_init (DwPageClass *klass)
{
   GtkObjectClass *object_class;
   DwWidgetClass *widget_class;
   DwContainerClass *container_class;

   object_class = (GtkObjectClass*) klass;
   widget_class = (DwWidgetClass*) klass;
   container_class = (DwContainerClass*) klass;
   parent_class = gtk_type_class (DW_TYPE_CONTAINER);

   page_signals[LINK_ENTERED] =
      gtk_signal_new ("link_entered",
                      GTK_RUN_LAST,
                      object_class->type,
                      GTK_SIGNAL_OFFSET (DwPageClass, link_entered),
                      p_Dw_marshal_link_enter,
                      GTK_TYPE_BOOL,
                      3, GTK_TYPE_INT, GTK_TYPE_INT, GTK_TYPE_INT);
   page_signals[LINK_PRESSED] =
      gtk_signal_new ("link_pressed",
                      GTK_RUN_LAST,
                      object_class->type,
                      GTK_SIGNAL_OFFSET (DwPageClass, link_pressed),
                      p_Dw_marshal_link_button,
                      GTK_TYPE_BOOL,
                      4, GTK_TYPE_INT, GTK_TYPE_INT, GTK_TYPE_INT,
                      GTK_TYPE_GDK_EVENT);
   page_signals[LINK_RELEASED] =
      gtk_signal_new ("link_released",
                      GTK_RUN_LAST,
                      object_class->type,
                      GTK_SIGNAL_OFFSET (DwPageClass, link_released),
                      p_Dw_marshal_link_button,
                      GTK_TYPE_BOOL,
                      4, GTK_TYPE_INT, GTK_TYPE_INT, GTK_TYPE_INT,
                      GTK_TYPE_GDK_EVENT);
   page_signals[LINK_CLICKED] =
      gtk_signal_new ("link_clicked",
                      GTK_RUN_LAST,
                      object_class->type,
                      GTK_SIGNAL_OFFSET (DwPageClass, link_clicked),
                      p_Dw_marshal_link_button,
                      GTK_TYPE_BOOL,
                      4, GTK_TYPE_INT, GTK_TYPE_INT, GTK_TYPE_INT,
                      GTK_TYPE_GDK_EVENT);
   gtk_object_class_add_signals (object_class, page_signals, LAST_SIGNAL);

   object_class->destroy = Dw_page_destroy;

   widget_class->size_request = Dw_page_size_request;
   widget_class->get_extremes = Dw_page_get_extremes;
   widget_class->size_allocate = Dw_page_size_allocate;
   widget_class->mark_size_change = Dw_page_mark_change;
   widget_class->mark_extremes_change = Dw_page_mark_change;
   widget_class->set_width = Dw_page_set_width;
   widget_class->set_ascent = Dw_page_set_ascent;
   widget_class->set_descent = Dw_page_set_descent;
   widget_class->draw = Dw_page_draw;
   widget_class->button_press_event = Dw_page_button_press;
   widget_class->button_release_event = Dw_page_button_release;
   widget_class->motion_notify_event = Dw_page_motion_notify;
   widget_class->leave_notify_event = Dw_page_leave_notify;
   widget_class->iterator = Dw_page_iterator;

   container_class->add = Dw_page_add;
   container_class->remove = Dw_page_remove;
   container_class->forall = Dw_page_forall;

   klass->link_entered = NULL;
   klass->link_pressed = NULL;
   klass->link_released = NULL;
   klass->link_clicked = NULL;
   klass->word_wrap = Dw_page_real_word_wrap;
}


/*
 * Destroy the page (standard Gtk+ function)
 */
static void Dw_page_destroy (GtkObject *object)
{
   DwPage *page = DW_PAGE (object);
   DwPageWord *word;
   gint i;

   //DEBUG_MSG (10, "Dw_page_destroy\n");

   for (i = 0; i < page->num_words; i++) {
      word = &page->words[i];
      if (word->content.type == DW_CONTENT_WIDGET)
         gtk_object_unref (GTK_OBJECT(word->content.data.widget));
      else if (word->content.type == DW_CONTENT_TEXT)
         g_free (word->content.data.text);
      else if (word->content.type == DW_CONTENT_ANCHOR)
         g_free (word->content.data.anchor);

      a_Dw_style_unref (word->style);
      a_Dw_style_unref (word->space_style);
   }

   g_free (page->lines);
   g_free (page->words);

   /* Make sure we don't own widgets anymore. Necessary before call of
      parent_class->destroy. */
   page->num_words = 0;
   page->num_lines = 0;

   DBG_OBJ_SET_NUM(page, "num_lines", page->num_lines);

   GTK_OBJECT_CLASS(parent_class)->destroy (object);
}