cellrenderericon.c

来自「Gqview,Linux下基于GTK+库写成的轻量级而能丰富的图像浏览程序。」· C语言 代码 · 共 644 行 · 第 1/2 页

	else
		{
		if (cellicon->foreground_set)
			{
			cellicon->foreground_set = FALSE;
			g_object_notify(G_OBJECT(cellicon), "foreground_set");
			}
		}
}

static void
gqv_cell_renderer_icon_set_property(GObject		*object,
				    guint		param_id,
				    const GValue	*value,
				    GParamSpec		*pspec)
{
	GQvCellRendererIcon *cellicon = GQV_CELL_RENDERER_ICON (object);
  
	switch (param_id)
		{
		case PROP_PIXBUF:
			{
			GdkPixbuf *pixbuf;

			pixbuf = (GdkPixbuf*) g_value_get_object (value);
			if (pixbuf) g_object_ref (pixbuf);
			if (cellicon->pixbuf) g_object_unref (cellicon->pixbuf);
			cellicon->pixbuf = pixbuf;
			}
		break;
	case PROP_TEXT:
		{
		gchar *text;

		text = cellicon->text;
		cellicon->text = g_strdup(g_value_get_string(value));
		g_free(text);

		g_object_notify(object, "text");
		}
		break;
	case PROP_BACKGROUND_GDK:
		set_bg_color(cellicon, g_value_get_boxed(value));
		break;
	case PROP_FOREGROUND_GDK:
		set_fg_color(cellicon, g_value_get_boxed(value));
		break;
	case PROP_FOCUSED:
		cellicon->focused = g_value_get_boolean(value);
		break;
	case PROP_FIXED_WIDTH:
		cellicon->fixed_width = g_value_get_int(value);
		break;
	case PROP_FIXED_HEIGHT:
		cellicon->fixed_height = g_value_get_int(value);
		break;
	case PROP_BACKGROUND_SET:
		cellicon->background_set = g_value_get_boolean(value);
		break;
	case PROP_FOREGROUND_SET:
		cellicon->foreground_set = g_value_get_boolean(value);
		break;
	case PROP_SHOW_TEXT:
		cellicon->show_text = g_value_get_boolean(value);
		break;
	default:
		G_OBJECT_WARN_INVALID_PROPERTY_ID (object, param_id, pspec);
		break;
    }
}

static PangoLayout *
gqv_cell_renderer_icon_get_layout(GQvCellRendererIcon *cellicon, GtkWidget *widget, gboolean will_render)
{
	PangoLayout *layout;
	gint width;

	width = (cellicon->fixed_width > 0) ? cellicon->fixed_width * PANGO_SCALE : -1;

	layout = gtk_widget_create_pango_layout(widget, cellicon->text);
	pango_layout_set_width(layout, width);
	pango_layout_set_alignment(layout, PANGO_ALIGN_CENTER);
	pango_layout_set_wrap(layout, PANGO_WRAP_WORD_CHAR);

	if (will_render)
		{
		PangoAttrList *attr_list;

		attr_list = pango_attr_list_new();

		if (cellicon->foreground_set)
			{
			PangoColor color;
			PangoAttribute *attr;

			color = cellicon->foreground;

			attr = pango_attr_foreground_new(color.red, color.green, color.blue);

			attr->start_index = 0;
			attr->end_index = G_MAXINT;
			pango_attr_list_insert(attr_list, attr);
			}

		pango_layout_set_attributes(layout, attr_list);
		pango_attr_list_unref(attr_list);
		}

	return layout;
}

/**
 * gqv_cell_renderer_icon_new:
 * 
 * Creates a new #GQvCellRendererIcon. Adjust rendering
 * parameters using object properties. Object properties can be set
 * globally (with g_object_set()). Also, with #GtkTreeViewColumn, you
 * can bind a property to a value in a #GtkTreeModel. For example, you
 * can bind the "pixbuf" property on the cell renderer to a pixbuf value
 * in the model, thus rendering a different image in each row of the
 * #GtkTreeView.
 * 
 * Return value: the new cell renderer
 **/
GtkCellRenderer *
gqv_cell_renderer_icon_new(void)
{
	return g_object_new (GQV_TYPE_CELL_RENDERER_ICON, NULL);
}

static void
gqv_cell_renderer_icon_get_size(GtkCellRenderer *cell,
				GtkWidget	*widget,
				GdkRectangle	*cell_area,
				gint		*x_offset,
				gint		*y_offset,
				gint		*width,
				gint		*height)
{
	GQvCellRendererIcon *cellicon = (GQvCellRendererIcon *) cell;
	gint calc_width;
	gint calc_height;

	if (cellicon->fixed_width > 0)
		{
		calc_width = cellicon->fixed_width;
		}
	else
		{
		calc_width = (cellicon->pixbuf) ? gdk_pixbuf_get_width(cellicon->pixbuf) : 0;
		}

	if (cellicon->fixed_height > 0)
		{
		calc_height = cellicon->fixed_height;
		}
	else
		{
		calc_height = (cellicon->pixbuf) ? gdk_pixbuf_get_height(cellicon->pixbuf) : 0;
		}

	if (cellicon->show_text && cellicon->text)
		{
		PangoLayout *layout;
		PangoRectangle rect;

		layout = gqv_cell_renderer_icon_get_layout(cellicon, widget, FALSE);
		pango_layout_get_pixel_extents(layout, NULL, &rect);
		g_object_unref(layout);

		calc_width = MAX(calc_width, rect.width);
		calc_height += rect.height;
		}

	calc_width += (gint)cell->xpad * 2;
	calc_height += (gint)cell->ypad * 2;

	if (x_offset) *x_offset = 0;
	if (y_offset) *y_offset = 0;

	if (cell_area && calc_width > 0 && calc_height > 0)
		{
		if (x_offset)
			{
			*x_offset = (cell->xalign * (cell_area->width - calc_width - 2 * cell->xpad));
			*x_offset = MAX (*x_offset, 0) + cell->xpad;
			}
		if (y_offset)
			{
			*y_offset = (cell->yalign * (cell_area->height - calc_height - 2 * cell->ypad));
			*y_offset = MAX (*y_offset, 0) + cell->ypad;
			}
		}

	if (width) *width = calc_width;
	if (height) *height = calc_height;
}

static void
gqv_cell_renderer_icon_render(GtkCellRenderer		*cell,
			      GdkWindow			*window,
			      GtkWidget			*widget,
			      GdkRectangle		*background_area,
			      GdkRectangle		*cell_area,
			      GdkRectangle		*expose_area,
			      GtkCellRendererState	flags)

{
	GQvCellRendererIcon *cellicon = (GQvCellRendererIcon *) cell;
	GdkPixbuf *pixbuf;
	const gchar *text;
	GdkRectangle cell_rect;
	GtkStateType state;

	pixbuf = cellicon->pixbuf;
	text = cellicon->text;

	if (!pixbuf && !text) return;

	gqv_cell_renderer_icon_get_size(cell, widget, cell_area,
					&cell_rect.x, &cell_rect.y,
					&cell_rect.width, &cell_rect.height);

	cell_rect.x += cell->xpad;
	cell_rect.y += cell->ypad;
	cell_rect.width -= cell->xpad * 2;
	cell_rect.height -= cell->ypad * 2;

	if ((flags & GTK_CELL_RENDERER_SELECTED) == GTK_CELL_RENDERER_SELECTED)
		{
		if (GTK_WIDGET_HAS_FOCUS(widget))
			state = GTK_STATE_SELECTED;
		else
			state = GTK_STATE_ACTIVE;
		}
	else
		{
		if (GTK_WIDGET_STATE(widget) == GTK_STATE_INSENSITIVE)
			state = GTK_STATE_INSENSITIVE;
		else
			state = GTK_STATE_NORMAL;
		}

	if (pixbuf)
		{
		GdkRectangle pix_rect;
		GdkRectangle draw_rect;

		pix_rect.width = gdk_pixbuf_get_width(pixbuf);
		pix_rect.height = gdk_pixbuf_get_height(pixbuf);

		pix_rect.x = cell_area->x + (cell_area->width - pix_rect.width) / 2;

		if (cellicon->fixed_height > 0)
			{
			pix_rect.y = cell_area->y + cell->ypad + (cellicon->fixed_height - pix_rect.height) / 2;
			}
		else
			{
			pix_rect.y = cell_area->y + cell_rect.y;
			}

		if (gdk_rectangle_intersect(cell_area, &pix_rect, &draw_rect) &&
		    gdk_rectangle_intersect(expose_area, &draw_rect, &draw_rect))
			{
			gdk_draw_pixbuf(window,
					widget->style->black_gc,
					pixbuf,
					/* pixbuf 0, 0 is at pix_rect.x, pix_rect.y */
					draw_rect.x - pix_rect.x,
					draw_rect.y - pix_rect.y,
					draw_rect.x,
					draw_rect.y,
					draw_rect.width,
					draw_rect.height,
					GDK_RGB_DITHER_NORMAL,
					0, 0);
			}
		}

	if (cellicon->show_text && text)
		{
		PangoLayout *layout;
		PangoRectangle text_rect;
		GdkRectangle pix_rect;
                GdkRectangle draw_rect;

		layout = gqv_cell_renderer_icon_get_layout(cellicon, widget, TRUE);
		pango_layout_get_pixel_extents(layout, NULL, &text_rect);

		pix_rect.width = text_rect.width;
		pix_rect.height = text_rect.height;
		pix_rect.x = cell_area->x + cell->xpad + (cell_rect.width - text_rect.width + 1) / 2;
		pix_rect.y = cell_area->y + cell->ypad + (cell_rect.height - text_rect.height);

		if (gdk_rectangle_intersect(cell_area, &pix_rect, &draw_rect) &&
		    gdk_rectangle_intersect(expose_area, &draw_rect, &draw_rect))
			{
			gtk_paint_layout(widget->style, window,
					 state, TRUE,
					 cell_area, widget,
					 "cellrenderertext",
					 pix_rect.x - text_rect.x, pix_rect.y,
					 layout);
			}

		g_object_unref(layout);
		}

	if (cellicon->focused &&
	    GTK_WIDGET_HAS_FOCUS(widget))
		{
		gtk_paint_focus(widget->style, window,
				state,
				cell_area, widget,
				"cellrendererfocus",
				cell_area->x, cell_area->y,
				cell_area->width, cell_area->height);
		}
}