gtkentry.c

gtk是linux一款强大的夸平台的图形化开发工具

	  editable->has_selection = FALSE;
	  editable->current_pos = editable->selection_start_pos;

	  if (gdk_selection_owner_get (GDK_SELECTION_PRIMARY) == widget->window)
	    gtk_selection_owner_set (NULL, GDK_SELECTION_PRIMARY, event->time);
	}
    }

  return FALSE;
}

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

  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);
  editable = GTK_EDITABLE (widget);

  if (entry->button != event->button)
    return FALSE;

  entry->button = 0;
  
  if (event->button == 1)
    {
      gtk_grab_remove (widget);

      editable->has_selection = FALSE;
      if (editable->selection_start_pos != editable->selection_end_pos)
	{
	  if (gtk_selection_owner_set (widget,
				       GDK_SELECTION_PRIMARY,
				       event->time))
	    editable->has_selection = TRUE;
	  else
	    gtk_entry_queue_draw (entry);
	}
      else
	{
	  if (gdk_selection_owner_get (GDK_SELECTION_PRIMARY) == widget->window)
	    gtk_selection_owner_set (NULL, GDK_SELECTION_PRIMARY, event->time);
	}
    }
  else if (event->button == 3)
    {
      gtk_grab_remove (widget);
    }

  return FALSE;
}

static gint
gtk_entry_motion_notify (GtkWidget      *widget,
			 GdkEventMotion *event)
{
  GtkEntry *entry;
  gint x;

  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 (entry->button == 0)
    return FALSE;

  x = event->x;
  if (event->is_hint || (entry->text_area != event->window))
    gdk_window_get_pointer (entry->text_area, &x, NULL, NULL);

  GTK_EDITABLE(entry)->selection_end_pos = gtk_entry_position (entry, x + entry->scroll_offset);
  GTK_EDITABLE(entry)->current_pos = GTK_EDITABLE(entry)->selection_end_pos;
  entry_adjust_scroll (entry);
  gtk_entry_queue_draw (entry);

  return FALSE;
}

static gint
gtk_entry_key_press (GtkWidget   *widget,
		     GdkEventKey *event)
{
  GtkEntry *entry;
  GtkEditable *editable;

  gint return_val;
  gint key;
  guint initial_pos;
  gint extend_selection;
  gint extend_start;

  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);
  editable = GTK_EDITABLE (widget);
  return_val = FALSE;

  if(editable->editable == FALSE)
    return FALSE;

  initial_pos = editable->current_pos;

  extend_selection = event->state & GDK_SHIFT_MASK;
  extend_start = FALSE;

  if (extend_selection)
    {
      if (editable->selection_start_pos == editable->selection_end_pos)
	{
	  editable->selection_start_pos = editable->current_pos;
	  editable->selection_end_pos = editable->current_pos;
	}
      
      extend_start = (editable->current_pos == editable->selection_start_pos);
    }

  switch (event->keyval)
    {
    case GDK_BackSpace:
      return_val = TRUE;
      if (event->state & GDK_CONTROL_MASK)
	gtk_delete_backward_word (entry);
      else
	gtk_delete_backward_character (entry);
      break;
    case GDK_Clear:
      return_val = TRUE;
      gtk_delete_line (entry);
      break;
    case GDK_Insert:
      return_val = TRUE;
      if (event->state & GDK_SHIFT_MASK)
	{
	  extend_selection = FALSE;
	  gtk_editable_paste_clipboard (editable);
	}
      else if (event->state & GDK_CONTROL_MASK)
	{
	  gtk_editable_copy_clipboard (editable);
	}
      else
	{
	  /* gtk_toggle_insert(entry) -- IMPLEMENT */
	}
      break;
    case GDK_Delete:
      return_val = TRUE;
      if (event->state & GDK_CONTROL_MASK)
	gtk_delete_forward_word (entry);
      else if (event->state & GDK_SHIFT_MASK)
	{
	  extend_selection = FALSE;
	  gtk_editable_cut_clipboard (editable);
	}
      else
	gtk_delete_forward_character (entry);
      break;
    case GDK_Home:
      return_val = TRUE;
      gtk_move_beginning_of_line (entry);
      break;
    case GDK_End:
      return_val = TRUE;
      gtk_move_end_of_line (entry);
      break;
    case GDK_Left:
      return_val = TRUE;
      if (event->state & GDK_CONTROL_MASK)
	gtk_move_backward_word (entry);
      else
	gtk_move_backward_character (entry);
      break;
    case GDK_Right:
      return_val = TRUE;
      if (event->state & GDK_CONTROL_MASK)
	gtk_move_forward_word (entry);
      else
	gtk_move_forward_character (entry);
      break;
    case GDK_Return:
      return_val = TRUE;
      gtk_widget_activate (widget);
      break;
    /* The next two keys should not be inserted literally. Any others ??? */
    case GDK_Tab:
    case GDK_Escape:
      break;
    default:
      if ((event->keyval >= 0x20) && (event->keyval <= 0xFF))
	{
	  key = event->keyval;

	  if (event->state & GDK_CONTROL_MASK)
	    {
	      if ((key >= 'A') && (key <= 'Z'))
		key -= 'A' - 'a';

	      if ((key >= 'a') && (key <= 'z') && control_keys[key - 'a'])
		{
		  (* control_keys[key - 'a']) (editable, event->time);
		  return_val = TRUE;
		}
	      break;
	    }
	  else if (event->state & GDK_MOD1_MASK)
	    {
	      if ((key >= 'A') && (key <= 'Z'))
		key -= 'A' - 'a';

	      if ((key >= 'a') && (key <= 'z') && alt_keys[key - 'a'])
		{
		  (* alt_keys[key - 'a']) (editable, event->time);
		  return_val = TRUE;
		}
	      break;
	    }
	}
      if (event->length > 0)
	{
	  gint tmp_pos;

	  extend_selection = FALSE;
	  gtk_editable_delete_selection (editable);

	  tmp_pos = editable->current_pos;
	  gtk_editable_insert_text (editable, event->string, event->length, &tmp_pos);
	  editable->current_pos = tmp_pos;

	  return_val = TRUE;
	}
      break;
    }

  /* since we emit signals from within the above code,
   * the widget might already be destroyed or at least
   * unrealized.
   */
  if (GTK_WIDGET_REALIZED (editable) &&
      return_val && (editable->current_pos != initial_pos))
    {
      if (extend_selection)
	{
	  if (editable->current_pos < editable->selection_start_pos)
	    editable->selection_start_pos = editable->current_pos;
	  else if (editable->current_pos > editable->selection_end_pos)
	    editable->selection_end_pos = editable->current_pos;
	  else
	    {
	      if (extend_start)
		editable->selection_start_pos = editable->current_pos;
	      else
		editable->selection_end_pos = editable->current_pos;
	    }
	}
      else
	{
	  editable->selection_start_pos = 0;
	  editable->selection_end_pos = 0;
	}

      gtk_editable_claim_selection (editable,
				    editable->selection_start_pos != editable->selection_end_pos,
				    event->time);
      
      entry_adjust_scroll (entry);
      gtk_entry_queue_draw (entry);
    }

  return return_val;
}

static gint
gtk_entry_focus_in (GtkWidget     *widget,
		    GdkEventFocus *event)
{
  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);

  GTK_WIDGET_SET_FLAGS (widget, GTK_HAS_FOCUS);
  gtk_widget_draw_focus (widget);

#ifdef USE_XIM
  if (GTK_EDITABLE(widget)->ic)
    gdk_im_begin (GTK_EDITABLE(widget)->ic, GTK_ENTRY(widget)->text_area);
#endif

  return FALSE;
}

static gint
gtk_entry_focus_out (GtkWidget     *widget,
		     GdkEventFocus *event)
{
  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);

  GTK_WIDGET_UNSET_FLAGS (widget, GTK_HAS_FOCUS);
  gtk_widget_draw_focus (widget);

#ifdef USE_XIM
  gdk_im_end ();
#endif

  return FALSE;
}

static void
gtk_entry_make_backing_pixmap (GtkEntry *entry, gint width, gint height)
{
  gint pixmap_width, pixmap_height;

  if (!entry->backing_pixmap)
    {
      /* allocate */
      entry->backing_pixmap = gdk_pixmap_new (entry->text_area,
					      width, height,
					      -1);
    }
  else
    {
      /* reallocate if sizes don't match */
      gdk_window_get_size (entry->backing_pixmap,
			   &pixmap_width, &pixmap_height);
      if ((pixmap_width != width) || (pixmap_height != height))
	{
	  gdk_pixmap_unref (entry->backing_pixmap);
	  entry->backing_pixmap = gdk_pixmap_new (entry->text_area,
						  width, height,
						  -1);
	}
    }
}

static void
gtk_entry_draw_text (GtkEntry *entry)
{
  GtkWidget *widget;
  GtkEditable *editable;
  GtkStateType selected_state;
  gint start_pos;
  gint end_pos;
  gint start_xoffset;
  gint selection_start_pos;
  gint selection_end_pos;
  gint selection_start_xoffset;
  gint selection_end_xoffset;
  gint width, height;
  gint y;
  GdkDrawable *drawable;
  gint use_backing_pixmap;
  GdkWChar *stars;
  GdkWChar *toprint;

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

  if (entry->timer)
    {
      gtk_timeout_remove (entry->timer);
      entry->timer = 0;
    }

  if (GTK_WIDGET_DRAWABLE (entry))
    {
      widget = GTK_WIDGET (entry);
      editable = GTK_EDITABLE (entry);

      if (!entry->text)
	{	  
	  gtk_paint_flat_box (widget->style, entry->text_area,
			      GTK_WIDGET_STATE(widget), GTK_SHADOW_NONE,
			      NULL, widget, "entry_bg", 
			      0, 0, -1, -1);

	  if (editable->editable)
	    gtk_entry_draw_cursor (entry);
	  return;
	}

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

      /*
	If the widget has focus, draw on a backing pixmap to avoid flickering
	and copy it to the text_area.
	Otherwise draw to text_area directly for better speed.
      */
      use_backing_pixmap = GTK_WIDGET_HAS_FOCUS (widget) && (entry->text != NULL);
      if (use_backing_pixmap)
	{
	   gtk_entry_make_backing_pixmap (entry, width, height);
	   drawable = entry->backing_pixmap;
	}
       else
	 {
	    drawable = entry->text_area;
	 }
       gtk_paint_flat_box (widget->style, drawable, 
			   GTK_WIDGET_STATE(widget), GTK_SHADOW_NONE,
			   NULL, widget, "entry_bg", 
			   0, 0, width, height);

      y = (height - (widget->style->font->ascent + widget->style->font->descent)) / 2;
      y += widget->style->font->ascent;

      start_pos = gtk_entry_find_position (entry, entry->scroll_offset);
      start_xoffset = entry->char_offset[start_pos] - entry->scroll_offset;

      end_pos = gtk_entry_find_position (entry, entry->scroll_offset + width);
      if (end_pos < entry->text_length)
	end_pos += 1;

      selected_state = GTK_STATE_SELECTED;
      if (!editable->has_selection)
	selected_state = GTK_STATE_ACTIVE;

      selection_start_pos = MIN (editable->selection_start_pos, editable->selection_end_pos);
      selection_end_pos = MAX (editable->selection_start_pos, editable->selection_end_pos);
      
      selection_start_pos = CLAMP (selection_start_pos, start_pos, end_pos);
      selection_end_pos = CLAMP (selection_end_pos, start_pos, end_pos);

      selection_start_xoffset = 
	entry->char_offset[selection_start_pos] - entry->scroll_offset;
      selection_end_xoffset = 
	entry->char_offset[selection_end_pos] -entry->scroll_offset;

      /* if editable->visible, print a bunch of stars.  If not, print the standard text. */
      if (editable->visible)
	{
	  toprint = entry->text + start_pos;
	}
      else
	{
	  gint i;
	  
	  stars = g_new (GdkWChar, end_pos - start_pos);
	  for (i = 0; i < end_pos - start_pos; i++)
	    stars[i] = '*';
	  toprint = stars;
	}
      
      if (selection_start_pos > start_pos)
	gdk_draw_text_wc (drawable, widget->style->font,
			  widget->style->fg_gc[GTK_WIDGET_STATE (widget)],
			  INNER_BORDER + start_xoffset, y,
			  toprint,
			  selection_start_pos - start_pos);
      
      if ((selection_end_pos >= start_pos) && 
	  (selection_start_pos < end_pos) &&
	  (selection_start_pos != selection_end_pos))