pixbuf-draw.c

linux下电话本所依赖的一些图形库

/* GTK+ Pixbuf Engine
 * Copyright (C) 1998-2000 Red Hat, Inc.
 *
 * This library 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 library 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
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 *
 * Written by Owen Taylor <[e-mail]>, based on code by
 * Carsten Haitzler <[e-mail]>
 */

#include <math.h>
#include <string.h>

#undef GDK_DISABLE_DEPRECATED

#include "pixbuf.h"
#include "pixbuf-rc-style.h"
#include "pixbuf-style.h"

static void pixbuf_style_init       (PixbufStyle      *style);
static void pixbuf_style_class_init (PixbufStyleClass *klass);

static GtkStyleClass *parent_class = NULL;

static ThemeImage *
match_theme_image (GtkStyle       *style,
		   ThemeMatchData *match_data)
{
  GList *tmp_list;

  tmp_list = PIXBUF_RC_STYLE (style->rc_style)->img_list;
  
  while (tmp_list)
    {
      guint flags;
      ThemeImage *image = tmp_list->data;
      tmp_list = tmp_list->next;

      if (match_data->function != image->match_data.function)
	continue;

      flags = match_data->flags & image->match_data.flags;
      
      if (flags != image->match_data.flags) /* Required components not present */
	continue;

      if ((flags & THEME_MATCH_STATE) &&
	  match_data->state != image->match_data.state)
	continue;

      if ((flags & THEME_MATCH_SHADOW) &&
	  match_data->shadow != image->match_data.shadow)
	continue;
      
      if ((flags & THEME_MATCH_ARROW_DIRECTION) &&
	  match_data->arrow_direction != image->match_data.arrow_direction)
	continue;

      if ((flags & THEME_MATCH_ORIENTATION) &&
	  match_data->orientation != image->match_data.orientation)
	continue;

      if ((flags & THEME_MATCH_GAP_SIDE) &&
	  match_data->gap_side != image->match_data.gap_side)
	continue;

      if (image->match_data.detail &&
	  (!match_data->detail ||
	   strcmp (match_data->detail, image->match_data.detail) != 0))
      continue;

      return image;
    }
  
  return NULL;
}

static gboolean
draw_simple_image(GtkStyle       *style,
		  GdkWindow      *window,
		  GdkRectangle   *area,
		  GtkWidget      *widget,
		  ThemeMatchData *match_data,
		  gboolean        draw_center,
		  gboolean        allow_setbg,
		  gint            x,
		  gint            y,
		  gint            width,
		  gint            height)
{
  ThemeImage *image;
  gboolean setbg = FALSE;
  
  if ((width == -1) && (height == -1))
    {
      gdk_drawable_get_size(window, &width, &height);
      if (allow_setbg)
      	setbg = TRUE;
    }
  else if (width == -1)
    gdk_drawable_get_size(window, &width, NULL);
  else if (height == -1)
    gdk_drawable_get_size(window, NULL, &height);

  if (!(match_data->flags & THEME_MATCH_ORIENTATION))
    {
      match_data->flags |= THEME_MATCH_ORIENTATION;
      
      if (height > width)
	match_data->orientation = GTK_ORIENTATION_VERTICAL;
      else
	match_data->orientation = GTK_ORIENTATION_HORIZONTAL;
    }
    
  image = match_theme_image (style, match_data);
  if (image)
    {
      if (image->background)
	{
	  theme_pixbuf_render (image->background,
			       window, NULL, area,
			       draw_center ? COMPONENT_ALL : COMPONENT_ALL | COMPONENT_CENTER,
			       FALSE,
			       x, y, width, height);
	}
      
      if (image->overlay && draw_center)
	theme_pixbuf_render (image->overlay,
			     window, NULL, area, COMPONENT_ALL,
			     TRUE, 
			     x, y, width, height);

      return TRUE;
    }
  else
    return FALSE;
}

static gboolean
draw_gap_image(GtkStyle       *style,
	       GdkWindow      *window,
	       GdkRectangle   *area,
	       GtkWidget      *widget,
	       ThemeMatchData *match_data,
	       gboolean        draw_center,
	       gint            x,
	       gint            y,
	       gint            width,
	       gint            height,
	       GtkPositionType gap_side,
	       gint            gap_x,
	       gint            gap_width)
{
  ThemeImage *image;
  gboolean setbg = FALSE;
  
  if ((width == -1) && (height == -1))
    {
      gdk_drawable_get_size(window, &width, &height);
      setbg = TRUE;
    }
  else if (width == -1)
    gdk_drawable_get_size(window, &width, NULL);
  else if (height == -1)
    gdk_drawable_get_size(window, NULL, &height);

  if (!(match_data->flags & THEME_MATCH_ORIENTATION))
    {
      match_data->flags |= THEME_MATCH_ORIENTATION;
      
      if (height > width)
	match_data->orientation = GTK_ORIENTATION_VERTICAL;
      else
	match_data->orientation = GTK_ORIENTATION_HORIZONTAL;
    }

  match_data->flags |= THEME_MATCH_GAP_SIDE;
  match_data->gap_side = gap_side;
    
  image = match_theme_image (style, match_data);
  if (image)
    {
      gint thickness;
      GdkRectangle r1, r2, r3;
      GdkPixbuf *pixbuf = NULL;
      guint components = COMPONENT_ALL;

      if (!draw_center)
	components |= COMPONENT_CENTER;

      if (image->gap_start)
	pixbuf = theme_pixbuf_get_pixbuf (image->gap_start);

      switch (gap_side)
	{
	case GTK_POS_TOP:
	  if (pixbuf)
	    thickness = gdk_pixbuf_get_height (pixbuf);
	  else
	    thickness = style->ythickness;
	  
	  if (!draw_center)
	    components |= COMPONENT_NORTH_WEST | COMPONENT_NORTH | COMPONENT_NORTH_EAST;

	  r1.x      = x;
	  r1.y      = y;
	  r1.width  = gap_x;
	  r1.height = thickness;
	  r2.x      = x + gap_x;
	  r2.y      = y;
	  r2.width  = gap_width;
	  r2.height = thickness;
	  r3.x      = x + gap_x + gap_width;
	  r3.y      = y;
	  r3.width  = width - (gap_x + gap_width);
	  r3.height = thickness;
	  break;
	  
	case GTK_POS_BOTTOM:
	  if (pixbuf)
	    thickness = gdk_pixbuf_get_height (pixbuf);
	  else
	    thickness = style->ythickness;

	  if (!draw_center)
	    components |= COMPONENT_SOUTH_WEST | COMPONENT_SOUTH | COMPONENT_SOUTH_EAST;

	  r1.x      = x;
	  r1.y      = y + height - thickness;
	  r1.width  = gap_x;
	  r1.height = thickness;
	  r2.x      = x + gap_x;
	  r2.y      = y + height - thickness;
	  r2.width  = gap_width;
	  r2.height = thickness;
	  r3.x      = x + gap_x + gap_width;
	  r3.y      = y + height - thickness;
	  r3.width  = width - (gap_x + gap_width);
	  r3.height = thickness;
	  break;
	  
	case GTK_POS_LEFT:
	  if (pixbuf)
	    thickness = gdk_pixbuf_get_width (pixbuf);
	  else
	    thickness = style->xthickness;

	  if (!draw_center)
	    components |= COMPONENT_NORTH_WEST | COMPONENT_WEST | COMPONENT_SOUTH_WEST;

	  r1.x      = x;
	  r1.y      = y;
	  r1.width  = thickness;
	  r1.height = gap_x;
	  r2.x      = x;
	  r2.y      = y + gap_x;
	  r2.width  = thickness;
	  r2.height = gap_width;
	  r3.x      = x;
	  r3.y      = y + gap_x + gap_width;
	  r3.width  = thickness;
	  r3.height = height - (gap_x + gap_width);
	  break;
	  
	case GTK_POS_RIGHT:
	  if (pixbuf)
	    thickness = gdk_pixbuf_get_width (pixbuf);
	  else
	    thickness = style->xthickness;

	  if (!draw_center)
	    components |= COMPONENT_NORTH_EAST | COMPONENT_EAST | COMPONENT_SOUTH_EAST;

	  r1.x      = x + width - thickness;
	  r1.y      = y;
	  r1.width  = thickness;
	  r1.height = gap_x;
	  r2.x      = x + width - thickness;
	  r2.y      = y + gap_x;
	  r2.width  = thickness;
	  r2.height = gap_width;
	  r3.x      = x + width - thickness;
	  r3.y      = y + gap_x + gap_width;
	  r3.width  = thickness;
	  r3.height = height - (gap_x + gap_width);
	  break;
	}

      if (image->background)
	theme_pixbuf_render (image->background,
			     window, NULL, area, components, FALSE,
			     x, y, width, height);
      if (image->gap_start)
	theme_pixbuf_render (image->gap_start,
			     window, NULL, area, COMPONENT_ALL, FALSE,
			     r1.x, r1.y, r1.width, r1.height);
      if (image->gap)
	theme_pixbuf_render (image->gap,
			     window, NULL, area, COMPONENT_ALL, FALSE,
			     r2.x, r2.y, r2.width, r2.height);
      if (image->gap_end)
	theme_pixbuf_render (image->gap_end,
			     window, NULL, area, COMPONENT_ALL, FALSE,
			     r3.x, r3.y, r3.width, r3.height);

      return TRUE;
    }
  else
    return FALSE;
}

static void
draw_hline (GtkStyle     *style,
	    GdkWindow    *window,
	    GtkStateType  state,
	    GdkRectangle *area,
	    GtkWidget    *widget,
	    const gchar  *detail,
	    gint          x1,
	    gint          x2,
	    gint          y)
{
  ThemeImage *image;
  ThemeMatchData   match_data;
  
  g_return_if_fail(style != NULL);
  g_return_if_fail(window != NULL);

  match_data.function = TOKEN_D_HLINE;
  match_data.detail = (gchar *)detail;
  match_data.flags = THEME_MATCH_ORIENTATION | THEME_MATCH_STATE;
  match_data.state = state;
  match_data.orientation = GTK_ORIENTATION_HORIZONTAL;
  
  image = match_theme_image (style, &match_data);
  if (image)
    {
      if (image->background)
	theme_pixbuf_render (image->background,
			     window, NULL, area, COMPONENT_ALL, FALSE,
			     x1, y, (x2 - x1) + 1, 2);
    }
  else
    parent_class->draw_hline (style, window, state, area, widget, detail,
			      x1, x2, y);
}

static void
draw_vline (GtkStyle     *style,
	    GdkWindow    *window,
	    GtkStateType  state,
	    GdkRectangle *area,
	    GtkWidget    *widget,
	    const gchar  *detail,
	    gint          y1,
	    gint          y2,
	    gint          x)
{
  ThemeImage    *image;
  ThemeMatchData match_data;
  
  g_return_if_fail (style != NULL);
  g_return_if_fail (window != NULL);

  match_data.function = TOKEN_D_VLINE;
  match_data.detail = (gchar *)detail;
  match_data.flags = THEME_MATCH_ORIENTATION | THEME_MATCH_STATE;
  match_data.state = state;
  match_data.orientation = GTK_ORIENTATION_VERTICAL;
  
  image = match_theme_image (style, &match_data);
  if (image)
    {
      if (image->background)
	theme_pixbuf_render (image->background,
			     window, NULL, area, COMPONENT_ALL, FALSE,
			     x, y1, 2, (y2 - y1) + 1);
    }
  else
    parent_class->draw_vline (style, window, state, area, widget, detail,
			      y1, y2, x);
}

static void
draw_shadow(GtkStyle     *style,
	    GdkWindow    *window,
	    GtkStateType  state,
	    GtkShadowType shadow,
	    GdkRectangle *area,
	    GtkWidget    *widget,
	    const gchar  *detail,
	    gint          x,
	    gint          y,
	    gint          width,
	    gint          height)
{
  ThemeMatchData match_data;
  
  g_return_if_fail(style != NULL);
  g_return_if_fail(window != NULL);

  match_data.function = TOKEN_D_SHADOW;
  match_data.detail = (gchar *)detail;
  match_data.flags = THEME_MATCH_SHADOW | THEME_MATCH_STATE;
  match_data.shadow = shadow;
  match_data.state = state;

  if (!draw_simple_image (style, window, area, widget, &match_data, FALSE, FALSE,
			  x, y, width, height))
    parent_class->draw_shadow (style, window, state, shadow, area, widget, detail,
			       x, y, width, height);
}

/* This function makes up for some brokeness in gtkrange.c
 * where we never get the full arrow of the stepper button
 * and the type of button in a single drawing function.
 *
 * It doesn't work correctly when the scrollbar is squished
 * to the point we don't have room for full-sized steppers.
 */
static void
reverse_engineer_stepper_box (GtkWidget    *range,
			      GtkArrowType  arrow_type,
			      gint         *x,
			      gint         *y,
			      gint         *width,
			      gint         *height)
{
  gint slider_width = 14, stepper_size = 14;
  gint box_width;
  gint box_height;
  
  if (range)
    {
      gtk_widget_style_get (range,
			    "slider_width", &slider_width,
			    "stepper_size", &stepper_size,
			    NULL);
    }
	
  if (arrow_type == GTK_ARROW_UP || arrow_type == GTK_ARROW_DOWN)
    {
      box_width = slider_width;
      box_height = stepper_size;
    }
  else
    {
      box_width = stepper_size;
      box_height = slider_width;
    }

  *x = *x - (box_width - *width) / 2;
  *y = *y - (box_height - *height) / 2;
  *width = box_width;
  *height = box_height;
}

static void
draw_arrow (GtkStyle     *style,
	    GdkWindow    *window,
	    GtkStateType  state,
	    GtkShadowType shadow,
	    GdkRectangle *area,
	    GtkWidget    *widget,
	    const gchar  *detail,
	    GtkArrowType  arrow_direction,
	    gint          fill,
	    gint          x,
	    gint          y,
	    gint          width,
	    gint          height)
{
  ThemeMatchData match_data;
  
  g_return_if_fail(style != NULL);
  g_return_if_fail(window != NULL);

  if (detail &&
      (strcmp (detail, "hscrollbar") == 0 || strcmp (detail, "vscrollbar") == 0))
    {
      /* This is a hack to work around the fact that scrollbar steppers are drawn
       * as a box + arrow, so we never have
       *
       *   The full bounding box of the scrollbar 
       *   The arrow direction
       *
       * At the same time. We simulate an extra paint function, "STEPPER", by doing
       * nothing for the box, and then here, reverse engineering the box that
       * was passed to draw box and using that
       */
      gint box_x = x;
      gint box_y = y;
      gint box_width = width;
      gint box_height = height;

      reverse_engineer_stepper_box (widget, arrow_direction,
				    &box_x, &box_y, &box_width, &box_height);

      match_data.function = TOKEN_D_STEPPER;
      match_data.detail = (gchar *)detail;
      match_data.flags = (THEME_MATCH_SHADOW | 
			  THEME_MATCH_STATE | 
			  THEME_MATCH_ARROW_DIRECTION);
      match_data.shadow = shadow;
      match_data.state = state;
      match_data.arrow_direction = arrow_direction;