gtkentry.c

gtk是linux一款强大的夸平台的图形化开发工具

void
gtk_entry_set_visibility (GtkEntry *entry,
			  gboolean visible)
{
  g_return_if_fail (entry != NULL);
  g_return_if_fail (GTK_IS_ENTRY (entry));

  entry->visible = visible ? TRUE : FALSE;
  GTK_EDITABLE (entry)->visible = visible ? TRUE : FALSE;
  gtk_entry_recompute_offsets (entry);
  gtk_widget_queue_draw (GTK_WIDGET (entry));
}

void
gtk_entry_set_editable(GtkEntry *entry,
		       gboolean  editable)
{
  g_return_if_fail (entry != NULL);
  g_return_if_fail (GTK_IS_ENTRY (entry));

  gtk_editable_set_editable (GTK_EDITABLE (entry), editable);
}

gchar*
gtk_entry_get_text (GtkEntry *entry)
{
  g_return_val_if_fail (entry != NULL, NULL);
  g_return_val_if_fail (GTK_IS_ENTRY (entry), NULL);

  if (!entry->text_mb_dirty)
    return entry->text_mb;

  if (entry->text_mb)
    g_free(entry->text_mb);

  if (!entry->text)
    {
      entry->text_mb = g_new(gchar, 1);
      entry->text_mb[0] = 0;
    }
  else
    {
      entry->text_mb = gtk_entry_get_chars(GTK_EDITABLE(entry), 0, -1);
    }
  entry->text_mb_dirty = 0;

  return entry->text_mb;
}

static void
gtk_entry_finalize (GtkObject *object)
{
  GtkEntry *entry;

  g_return_if_fail (object != NULL);
  g_return_if_fail (GTK_IS_ENTRY (object));

  entry = GTK_ENTRY (object);

  if (entry->timer)
    gtk_timeout_remove (entry->timer);

  entry->text_size = 0;

  if (entry->text)
    g_free (entry->text);
  if (entry->char_offset)
    g_free (entry->char_offset);
  entry->text = NULL;

  if (entry->text_mb)
    g_free (entry->text_mb);
  entry->text_mb = NULL;
 
  if (entry->backing_pixmap)
    gdk_pixmap_unref (entry->backing_pixmap);

  (* GTK_OBJECT_CLASS (parent_class)->finalize) (object);
}

static void
gtk_entry_realize (GtkWidget *widget)
{
  GtkEntry *entry;
  GtkEditable *editable;
  GtkRequisition requisition;
  GdkWindowAttr attributes;
  gint attributes_mask;

  g_return_if_fail (widget != NULL);
  g_return_if_fail (GTK_IS_ENTRY (widget));

  GTK_WIDGET_SET_FLAGS (widget, GTK_REALIZED);
  entry = GTK_ENTRY (widget);
  editable = GTK_EDITABLE (widget);

  gtk_widget_get_child_requisition (widget, &requisition);
  
  attributes.window_type = GDK_WINDOW_CHILD;
  attributes.x = widget->allocation.x;
  attributes.y = widget->allocation.y + (widget->allocation.height -
					 requisition.height) / 2;
  attributes.width = widget->allocation.width;
  attributes.height = requisition.height;
  attributes.wclass = GDK_INPUT_OUTPUT;
  attributes.visual = gtk_widget_get_visual (widget);
  attributes.colormap = gtk_widget_get_colormap (widget);
  attributes.event_mask = gtk_widget_get_events (widget);
  attributes.event_mask |= (GDK_EXPOSURE_MASK |
			    GDK_BUTTON_PRESS_MASK |
			    GDK_BUTTON_RELEASE_MASK |
			    GDK_BUTTON1_MOTION_MASK |
			    GDK_BUTTON3_MOTION_MASK |
			    GDK_POINTER_MOTION_HINT_MASK |
			    GDK_ENTER_NOTIFY_MASK |
			    GDK_LEAVE_NOTIFY_MASK |
			    GDK_KEY_PRESS_MASK);
  attributes_mask = GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL | GDK_WA_COLORMAP;

  widget->window = gdk_window_new (gtk_widget_get_parent_window (widget), &attributes, attributes_mask);
  gdk_window_set_user_data (widget->window, entry);

  attributes.x = widget->style->klass->xthickness;
  attributes.y = widget->style->klass->ythickness;
  attributes.width = widget->allocation.width - attributes.x * 2;
  attributes.height = requisition.height - attributes.y * 2;
  attributes.cursor = entry->cursor = gdk_cursor_new (GDK_XTERM);
  attributes_mask |= GDK_WA_CURSOR;

  entry->text_area = gdk_window_new (widget->window, &attributes, attributes_mask);
  gdk_window_set_user_data (entry->text_area, entry);

  widget->style = gtk_style_attach (widget->style, widget->window);

  gdk_window_set_background (widget->window, &widget->style->base[GTK_WIDGET_STATE (widget)]);
  gdk_window_set_background (entry->text_area, &widget->style->base[GTK_WIDGET_STATE (widget)]);

#ifdef USE_XIM
  if (gdk_im_ready () && (editable->ic_attr = gdk_ic_attr_new ()) != NULL)
    {
      gint width, height;
      GdkEventMask mask;
      GdkColormap *colormap;
      GdkICAttr *attr = editable->ic_attr;
      GdkICAttributesType attrmask = GDK_IC_ALL_REQ;
      GdkIMStyle style;
      GdkIMStyle supported_style = GDK_IM_PREEDIT_NONE |
				   GDK_IM_PREEDIT_NOTHING |
			           GDK_IM_PREEDIT_POSITION |
			           GDK_IM_STATUS_NONE |
				   GDK_IM_STATUS_NOTHING;

      if (widget->style && widget->style->font->type != GDK_FONT_FONTSET)
	supported_style &= ~GDK_IM_PREEDIT_POSITION;

      attr->style = style = gdk_im_decide_style (supported_style);
      attr->client_window = entry->text_area;

      if ((colormap = gtk_widget_get_colormap (widget)) !=
	    gtk_widget_get_default_colormap ())
	{
	  attrmask |= GDK_IC_PREEDIT_COLORMAP;
	  attr->preedit_colormap = colormap;
	}
      attrmask |= GDK_IC_PREEDIT_FOREGROUND;
      attrmask |= GDK_IC_PREEDIT_BACKGROUND;
      attr->preedit_foreground = widget->style->fg[GTK_STATE_NORMAL];
      attr->preedit_background = widget->style->base[GTK_STATE_NORMAL];

      switch (style & GDK_IM_PREEDIT_MASK)
	{
	case GDK_IM_PREEDIT_POSITION:
	  if (widget->style && widget->style->font->type != GDK_FONT_FONTSET)
	    {
	      g_warning ("over-the-spot style requires fontset");
	      break;
	    }

	  gdk_window_get_size (entry->text_area, &width, &height);

	  attrmask |= GDK_IC_PREEDIT_POSITION_REQ;
	  attr->spot_location.x = 0;
	  attr->spot_location.y = height;
	  attr->preedit_area.x = 0;
	  attr->preedit_area.y = 0;
	  attr->preedit_area.width = width;
	  attr->preedit_area.height = height;
	  attr->preedit_fontset = widget->style->font;

	  break;
	}
      editable->ic = gdk_ic_new (attr, attrmask);
     
      if (editable->ic == NULL)
	g_warning ("Can't create input context.");
      else
	{
	  mask = gdk_window_get_events (entry->text_area);
	  mask |= gdk_ic_get_events (editable->ic);
	  gdk_window_set_events (entry->text_area, mask);

	  if (GTK_WIDGET_HAS_FOCUS(widget))
	    gdk_im_begin (editable->ic, entry->text_area);
	}
    }
#endif

  gdk_window_show (entry->text_area);

  if (editable->selection_start_pos != editable->selection_end_pos)
    gtk_editable_claim_selection (editable, TRUE, GDK_CURRENT_TIME);

  gtk_entry_recompute_offsets (entry);
}

static void
gtk_entry_unrealize (GtkWidget *widget)
{
  GtkEntry *entry;

  g_return_if_fail (widget != NULL);
  g_return_if_fail (GTK_IS_ENTRY (widget));

  entry = GTK_ENTRY (widget);

#ifdef USE_XIM
  if (GTK_EDITABLE (widget)->ic)
    {
      gdk_ic_destroy (GTK_EDITABLE (widget)->ic);
      GTK_EDITABLE (widget)->ic = NULL;
    }
  if (GTK_EDITABLE (widget)->ic_attr)
    {
      gdk_ic_attr_destroy (GTK_EDITABLE (widget)->ic_attr);
      GTK_EDITABLE (widget)->ic_attr = NULL;
    }
#endif

  if (entry->text_area)
    {
      gdk_window_set_user_data (entry->text_area, NULL);
      gdk_window_destroy (entry->text_area);
      entry->text_area = NULL;
      gdk_cursor_destroy (entry->cursor);
      entry->cursor = NULL;
    }

  if (GTK_WIDGET_CLASS (parent_class)->unrealize)
    (* GTK_WIDGET_CLASS (parent_class)->unrealize) (widget);
}

static void
gtk_entry_draw_focus (GtkWidget *widget)
{
  gint width, height;
  gint x, y;

  g_return_if_fail (widget != NULL);
  g_return_if_fail (GTK_IS_ENTRY (widget));

  if (GTK_WIDGET_DRAWABLE (widget))
    {
      x = 0;
      y = 0;
      gdk_window_get_size (widget->window, &width, &height);

      if (GTK_WIDGET_HAS_FOCUS (widget))
	{
	  x += 1;
	  y += 1;
	  width -= 2;
	  height -= 2;
	}

      gtk_paint_shadow (widget->style, widget->window,
			GTK_STATE_NORMAL, GTK_SHADOW_IN,
			NULL, widget, "entry",
			x, y, width, height);

      if (GTK_WIDGET_HAS_FOCUS (widget))
	{
	   gdk_window_get_size (widget->window, &width, &height);
	   gtk_paint_focus (widget->style, widget->window, 
			    NULL, widget, "entry",
			    0, 0, width - 1, height - 1);
	}

      if (GTK_EDITABLE (widget)->editable)
	gtk_entry_draw_cursor (GTK_ENTRY (widget));
    }
}

static void
gtk_entry_size_request (GtkWidget      *widget,
			GtkRequisition *requisition)
{
  g_return_if_fail (widget != NULL);
  g_return_if_fail (GTK_IS_ENTRY (widget));
  g_return_if_fail (requisition != NULL);

  requisition->width = MIN_ENTRY_WIDTH + (widget->style->klass->xthickness + INNER_BORDER) * 2;
  requisition->height = (widget->style->font->ascent +
			 widget->style->font->descent +
			 (widget->style->klass->ythickness + INNER_BORDER) * 2);
}

static void
gtk_entry_size_allocate (GtkWidget     *widget,
			 GtkAllocation *allocation)
{
  GtkEntry *entry;
  GtkEditable *editable;

  g_return_if_fail (widget != NULL);
  g_return_if_fail (GTK_IS_ENTRY (widget));
  g_return_if_fail (allocation != NULL);

  widget->allocation = *allocation;
  entry = GTK_ENTRY (widget);
  editable = GTK_EDITABLE (widget);

  if (GTK_WIDGET_REALIZED (widget))
    {
      /* We call gtk_widget_get_child_requisition, since we want (for
       * backwards compatibility reasons) the realization here to
       * be affected by the usize of the entry, if set
       */
      GtkRequisition requisition;
      gtk_widget_get_child_requisition (widget, &requisition);
  
      gdk_window_move_resize (widget->window,
			      allocation->x,
			      allocation->y + (allocation->height - requisition.height) / 2,
			      allocation->width, requisition.height);
      gdk_window_move_resize (entry->text_area,
			      widget->style->klass->xthickness,
			      widget->style->klass->ythickness,
			      allocation->width - widget->style->klass->xthickness * 2,
			      requisition.height - widget->style->klass->ythickness * 2);

      /* And make sure the cursor is on screen */
      entry_adjust_scroll (entry);
      
#ifdef USE_XIM
      if (editable->ic &&
	  (gdk_ic_get_style (editable->ic) & GDK_IM_PREEDIT_POSITION))
	{
	  gint width, height;

	  gdk_window_get_size (entry->text_area, &width, &height);
	  editable->ic_attr->preedit_area.width = width;
	  editable->ic_attr->preedit_area.height = height;
	  gdk_ic_set_attr (editable->ic, editable->ic_attr,
	      		   GDK_IC_PREEDIT_AREA);
	}
#endif
    }
}

static void
gtk_entry_draw (GtkWidget    *widget,
		GdkRectangle *area)
{
  g_return_if_fail (widget != NULL);
  g_return_if_fail (GTK_IS_ENTRY (widget));
  g_return_if_fail (area != NULL);

  if (GTK_WIDGET_DRAWABLE (widget))
    {
      gtk_widget_draw_focus (widget);
      gtk_entry_draw_text (GTK_ENTRY (widget));
    }
}

static gint
gtk_entry_expose (GtkWidget      *widget,
		  GdkEventExpose *event)
{
  GtkEntry *entry;

  g_return_val_if_fail (widget != NULL, FALSE);
  g_return_val_if_fail (GTK_IS_ENTRY (widget), FALSE);
  g_return_val_if_fail (event != NULL, FALSE);

  entry = GTK_ENTRY (widget);

  if (widget->window == event->window)
    gtk_widget_draw_focus (widget);
  else if (entry->text_area == event->window)
    gtk_entry_draw_text (GTK_ENTRY (widget));

  return FALSE;
}

static gint
gtk_entry_button_press (GtkWidget      *widget,
			GdkEventButton *event)
{
  GtkEntry *entry;
  GtkEditable *editable;
  gint tmp_pos;

  g_return_val_if_fail (widget != NULL, FALSE);
  g_return_val_if_fail (GTK_IS_ENTRY (widget), FALSE);
  g_return_val_if_fail (event != NULL, FALSE);

  if (ctext_atom == GDK_NONE)
    ctext_atom = gdk_atom_intern ("COMPOUND_TEXT", FALSE);

  entry = GTK_ENTRY (widget);
  editable = GTK_EDITABLE (widget);
  
  if (entry->button && (event->button != entry->button))
    return FALSE;

  entry->button = event->button;
  
  if (!GTK_WIDGET_HAS_FOCUS (widget))
    gtk_widget_grab_focus (widget);

  if (event->button == 1)
    {
      switch (event->type)
	{
	case GDK_BUTTON_PRESS:
	  gtk_grab_add (widget);

	  tmp_pos = gtk_entry_position (entry, event->x + entry->scroll_offset);
	  /* Set it now, so we display things right. We'll unset it
	   * later if things don't work out */
	  editable->has_selection = TRUE;
	  gtk_entry_set_selection (editable, tmp_pos, tmp_pos);
	  editable->current_pos = editable->selection_start_pos;
	  break;

	case GDK_2BUTTON_PRESS:
	  gtk_select_word (entry, event->time);
	  break;

	case GDK_3BUTTON_PRESS:
	  gtk_select_line (entry, event->time);
	  break;

	default:
	  break;
	}
    }
  else if (event->type == GDK_BUTTON_PRESS)
    {
      if ((event->button == 2) && editable->editable)
	{
	  if (editable->selection_start_pos == editable->selection_end_pos ||
	      editable->has_selection)
	    editable->current_pos = gtk_entry_position (entry, event->x + entry->scroll_offset);
	  gtk_selection_convert (widget, GDK_SELECTION_PRIMARY,
				 ctext_atom, event->time);
	}
      else
	{
	  gtk_grab_add (widget);

	  tmp_pos = gtk_entry_position (entry, event->x + entry->scroll_offset);
	  gtk_entry_set_selection (editable, tmp_pos, tmp_pos);