dw_style.c

嵌入式下基于MiniGUI的Web Browser

   color->b = blue;
}

/*
   Return a new or already existing color. color_val has the form
   0xrrggbb.
 */
DwStyleColor* a_Dw_style_color_new (gint color_val, HWND wnd)
{
   DwStyleColor *color;
   HDC hdc;

   hdc = GetClientDC (wnd);

   color = g_hash_table_lookup (colors_table, GINT_TO_POINTER (color_val));
   if (color == NULL) {
      color = g_new (DwStyleColor, 1);
      color->ref_count = 0;
      color->color_val = color_val;

      Dw_style_color_create (color_val, &color->color, 0);
      color->pixel = RGB2Pixel (hdc, color->color.r, color->color.g, color->color.b);
      Dw_style_color_create (color_val ^ 0xffffff, &color->inverse_color, 0);
      color->inverse_pixel = RGB2Pixel (hdc, color->inverse_color.r, color->inverse_color.g, color->inverse_color.b);
      g_hash_table_insert (colors_table, GINT_TO_POINTER (color_val) , color);
      g_hash_table_insert (colors_table, GINT_TO_POINTER (color_val), color);
      
   }

   ReleaseDC (hdc);

   return color;
}

/*
 * Remove a color (called when ref_count == 0).
 */
static void Dw_style_color_remove (DwStyleColor *color)
{
   g_hash_table_remove (colors_table,  GINT_TO_POINTER (color->color_val));
#if 0
   gdk_gc_destroy (color->gc);
   gdk_gc_destroy (color->inverse_gc);
#endif
   g_free (color);
}


/*
 * Return a new or already existing shaded color. color_val has the
 * form 0xrrggbb.
 */
DwStyleShadedColor* a_Dw_style_shaded_color_new (gint color_val, HWND wnd)
{
   DwStyleShadedColor *color;

   HDC hdc;

   hdc = GetClientDC (wnd);

   color =
      g_hash_table_lookup (shaded_colors_table, GINT_TO_POINTER (color_val));
   if (color == NULL) {
      color = g_new (DwStyleShadedColor, 1);
      color->ref_count = 0;
      color->color_val = color_val;

      Dw_style_color_create (color_val, &color->color, 0);
      color->pixel = RGB2Pixel (hdc, color->color.r, color->color.g, color->color.b);
      Dw_style_color_create (color_val ^ 0xffffff, &color->inverse_color, 0);
      color->inverse_pixel = RGB2Pixel (hdc, color->inverse_color.r, color->inverse_color.g, color->inverse_color.b);
      Dw_style_color_create (color_val, &color->color_dark, -1);
      color->pixel_dark = RGB2Pixel (hdc, color->color_dark.r, color->color_dark.g, color->color_dark.b);
      Dw_style_color_create (color_val, &color->color_light, +1);
      color->pixel_light = RGB2Pixel (hdc, color->color_light.r, color->color_light.g, color->color_light.b);
      g_hash_table_insert (shaded_colors_table,
                            GINT_TO_POINTER (color_val), color);
   }

   ReleaseDC (hdc);
   return color;
}

/*
 * Remove a shaded color (called when ref_count == 0).
 */
static void Dw_style_shaded_color_remove (DwStyleShadedColor *color)
{
   g_hash_table_remove (shaded_colors_table,
                         GINT_TO_POINTER (color->color_val));
#if 0
   gdk_gc_destroy (color->gc);
   gdk_gc_destroy (color->gc_dark);
   gdk_gc_destroy (color->gc_light);
#endif
   g_free (color);
}

/*
 * This function returns whether something may change its size, when
 * its style changes from style1 to style2. It is mainly for
 * optimizing style changes where only colors etc change (where FALSE
 * would be returned), in some cases it may return TRUE, although a
 * size change does not actually happen (e.g. when in a certain
 * context a particular attribute is ignored).
 */
gboolean a_Dw_style_size_diffs (DwStyle *style1,
                                DwStyle *style2)
{
   /* todo: Should for CSS implemented properly. Currently, size
    * changes are not needed, so always FALSE is returned. See also
    * a_Dw_widget_set_style(). */
   return FALSE;
}


/* ----------------------------------------------------------------------
 *
 *    Drawing functions
 *
 * ----------------------------------------------------------------------
 */

/*
 * Draw a part of a border.
 */
static void Dw_style_draw_polygon (HDC hdc, const RGB* color,
                                   gint32 x1, gint32 y1, gint32 x2, gint32 y2,
                                   gint32 width, gint32 w1, gint32 w2)
{
   POINT points[4];

   SetPenColor (hdc, RGB2Pixel (hdc, color->r, color->g, color->b));
   SetBrushColor (hdc, RGB2Pixel (hdc, color->r, color->g, color->b));

   if (width != 0) {
      if (width == 1) {
         if (x1 == x2) {
            MoveTo (hdc, x1, y1);
            LineTo (hdc, x2, y2 - 1);
         }
         else {
            MoveTo (hdc, x1, y1);
            LineTo (hdc, x2 - 1, y2);
         }
      } else if (width == -1) {
         if (x1 == x2) {
            MoveTo (hdc, x1 - 1, y1);
            LineTo (hdc, x2 - 1, y2 - 1);
         }
         else {
            MoveTo (hdc, x1, y1 - 1);
            LineTo (hdc, x2 - 1, y2 - 1);
         }
      } else {
         points[0].x = x1;
         points[0].y = y1;
         points[1].x = x2;
         points[1].y = y2;

         if (x1 == x2) {
            points[2].x = x1 + width;
            points[2].y = y2 + w2;
            points[3].x = x1 + width;
            points[3].y = y1 + w1;
         } else {
            points[2].x = x2 + w2;
            points[2].y = y1 + width;
            points[3].x = x1 + w1;
            points[3].y = y1 + width;
         }

         FillPolygon (hdc, points, 4);
      }
   }
}


/*
 * Draw the border of a region in window, according to style. Used by
 * Dw_widget_draw_box and Dw_widget_draw_widget_box.
 */

#define LIMIT(v)    if ((v) < -30000) v = -30000; \
                    if ((v) > 30000) v = 30000

void p_Dw_style_draw_border (HDC hdc,
                             DwRectangle *area,
                             gint32 vx,
                             gint32 vy,
                             gint32 x,
                             gint32 y,
                             gint32 width,
                             gint32 height,
                             DwStyle *style,
                             gboolean inverse)
{
   /* todo: a lot! */
   RGB *dark_color, *light_color, *normal_color;
   RGB *top_color, *right_color, *bottom_color, *left_color;
   gint32 xb1, yb1, xb2, yb2, xp1, yp1, xp2, yp2;

   if (style->border_style.top == DW_STYLE_BORDER_NONE)
      return;

   xb1 = x + style->margin.left - vx;
   yb1 = y + style->margin.top - vy;
   xb2 = xb1 + width - style->margin.left - style->margin.right;
   yb2 = yb1 + height - style->margin.top - style->margin.bottom;

   xp1 = xb1 + style->border_width.top;
   yp1 = yb1 + style->border_width.left;
   xp2 = xb2 + style->border_width.bottom;
   yp2 = yb2 + style->border_width.right;

   /* Make sure that we pass 16-bit values to Gdk functions. */
   LIMIT (xb1);
   LIMIT (xb2);
   LIMIT (yb1);
   LIMIT (yb2);

   light_color = inverse ? &style->border_color.top->color_dark :
      &style->border_color.top->color_light;
   dark_color = inverse ? &style->border_color.top->color_light :
      &style->border_color.top->color_dark;
   normal_color = inverse ? &style->border_color.top->inverse_color :
      &style->border_color.top->color;

   switch (style->border_style.top) {
   case DW_STYLE_BORDER_INSET:
      top_color = left_color = dark_color;
      right_color = bottom_color = light_color;
      break;

   case DW_STYLE_BORDER_OUTSET:
      top_color = left_color = light_color;
      right_color = bottom_color = dark_color;
      break;

   default:
      top_color = right_color = bottom_color = left_color = normal_color;
      break;
   }

   Dw_style_draw_polygon (hdc, top_color, xb1, yb1, xb2, yb1,
                          style->border_width.top,
                          style->border_width.left,
                          - style->border_width.right);
   Dw_style_draw_polygon (hdc, right_color, xb2, yb1, xb2, yb2,
                          - style->border_width.right,
                          style->border_width.top,
                          - style->border_width.bottom);
   Dw_style_draw_polygon (hdc, bottom_color, xb1, yb2, xb2, yb2,
                          - style->border_width.bottom,
                          style->border_width.left,
                          - style->border_width.right);
   Dw_style_draw_polygon (hdc, left_color, xb1, yb1, xb1, yb2,
                          style->border_width.left,
                          style->border_width.top,
                          - style->border_width.bottom);
}


/*
 * Draw the background (content plus padding) of a region in window,
 * according to style. Used by Dw_widget_draw_box and
 * Dw_widget_draw_widget_box.
 */
void p_Dw_style_draw_background (HDC hdc,
                                 DwRectangle *area,
                                 gint32 vx,
                                 gint32 vy,
                                 gint32 x,
                                 gint32 y,
                                 gint32 width,
                                 gint32 height,
                                 DwStyle *style,
                                 gboolean inverse)
{
   DwRectangle dw_area, bg_area, intersection;

   if (style->background_color) {
      dw_area.x = area->x + vx;
      dw_area.y = area->y + vy;
      dw_area.width = area->width;
      dw_area.height = area->height;

      bg_area.x = x + style->margin.left + style->border_width.left;
      bg_area.y = y + style->margin.top + style->border_width.top;
      bg_area.width =
         width - style->margin.left - style->border_width.left -
         style->margin.right - style->border_width.right;
      bg_area.height =
         height - style->margin.top - style->border_width.top -
         style->margin.bottom - style->border_width.bottom;

      if (p_Dw_rectangle_intersect (&dw_area, &bg_area, &intersection)) {
         gal_pixel pixel = inverse ? style->background_color->inverse_pixel :
                            style->background_color->pixel;
         SetBrushColor (hdc, pixel);
         FillBox (hdc, intersection.x - vx, intersection.y - vy,
                             intersection.width, intersection.height);
      }
   }
}


/*
 * Convert a number into a string, in a given style. Used for ordered lists.
 */
void a_Dw_style_numtostr (gint num,
                          gchar *buf,
                          gint buflen,
                          DwStyleListStyleType list_style_tyle)
{
   int i3, i2, i1, i0;
   gboolean low = FALSE;

   switch(list_style_tyle){
   case DW_STYLE_LIST_STYLE_TYPE_LOWER_ALPHA:
      low = TRUE;
   case DW_STYLE_LIST_STYLE_TYPE_UPPER_ALPHA:
      i0 = num - 1;
      i1 = i0/26; i2 = i1/26;
      i0 %= 26;   i1 %= 26;
      if (i2 > 26) /* more than 26*26*26=17576 elements ? */
         sprintf(buf, "****.");
      else if (i2)
         sprintf(buf, "%c%c%c.", 'A'+i2-1,'A'+i1-1,'A'+i0);
      else if (i1)
         sprintf(buf, "%c%c.", 'A'+i1-1,'A'+i0);
      else
         sprintf(buf, "%c.", 'A'+i0);
      if (low)
         g_strdown(buf);
      break;
   case DW_STYLE_LIST_STYLE_TYPE_LOWER_ROMAN:
      low = TRUE;
   case DW_STYLE_LIST_STYLE_TYPE_UPPER_ROMAN:
      i0 = num - 1;
      i1 = i0/10; i2 = i1/10; i3 = i2/10;
      i0 %= 10;   i1 %= 10;   i2 %= 10;
      if (i3 > 4) /* more than 4999 elements ? */
         sprintf(buf, "****.");
      else if (i3)
         sprintf(buf, "%s%s%s%s.", roman_I3[i3-1], roman_I2[i2-1],
                 roman_I1[i1-1], roman_I0[i0]);
      else if (i2)
         sprintf(buf, "%s%s%s.", roman_I2[i2-1],
                 roman_I1[i1-1], roman_I0[i0]);
      else if (i1)
         sprintf(buf, "%s%s.", roman_I1[i1-1], roman_I0[i0]);
      else
         sprintf(buf, "%s.", roman_I0[i0]);
      if (low)
         g_strdown(buf);
      break;
   case DW_STYLE_LIST_STYLE_TYPE_DECIMAL:
   default:
      g_snprintf(buf, buflen, "%d.", num);
      break;
   }
}