pintos-os.org Git - pspp/blob - src/ui/gui/pspp-widget-facade.c

   1 /* PSPPIRE - a graphical user interface for PSPP.
   2    Copyright (C) 2011, 2012 Free Software Foundation, Inc.
   3
   4    This program is free software: you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation, either version 3 of the License, or
   7    (at your option) any later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program.  If not, see <http://www.gnu.org/licenses/>. */
  16
  17 #include <config.h>
  18
  19 #include "pspp-widget-facade.h"
  20
  21 #include <math.h>
  22 #include <stdarg.h>
  23 #include <stdlib.h>
  24 #include <string.h>
  25
  26 static void
  27 inset_rectangle (const GdkRectangle *src,
  28                  const GtkBorder *inset,
  29                  GdkRectangle *dst)
  30 {
  31   dst->x = src->x + inset->left;
  32   dst->y = src->y + inset->top;
  33   dst->width = MAX (1, src->width - inset->left - inset->right);
  34   dst->height = MAX (1, src->height - inset->top - inset->bottom);
  35 }
  36
  37 static void
  38 thicken_border (gint x, gint y, GtkBorder *border)
  39 {
  40   border->left += x;
  41   border->right += x;
  42   border->top += y;
  43   border->bottom += y;
  44 }
  45
  46 GtkStyle *
  47 facade_get_style (GtkWidget *base,
  48                   GType type1,
  49                   ...)
  50 {
  51   GString path, class_path;
  52   GType final_type;
  53   GtkStyle *style;
  54   va_list args;
  55   GType type;
  56
  57   gtk_widget_path (base, NULL, &path.str, NULL);
  58   path.len = path.allocated_len = strlen (path.str);
  59
  60   gtk_widget_class_path (base, NULL, &class_path.str, NULL);
  61   class_path.len = class_path.allocated_len = strlen (class_path.str);
  62
  63   va_start (args, type1);
  64   for (type = final_type = type1; type != 0; type = va_arg (args, GType))
  65     {
  66       const gchar *type_name = g_type_name (type);
  67       g_string_append_printf (&path, ".%s", type_name);
  68       g_string_append_printf (&class_path, ".%s", type_name);
  69       final_type = type;
  70     }
  71   va_end (args);
  72
  73   style = gtk_rc_get_style_by_paths (gtk_widget_get_settings (base),
  74                                      path.str, class_path.str, final_type);
  75
  76   free (path.str);
  77   free (class_path.str);
  78
  79   return style;
  80 }
  81
  82 void
  83 facade_hbox_get_base_size_request (gint border_width,
  84                                    gint spacing,
  85                                    gint n_children,
  86                                    GtkRequisition *request)
  87 {
  88   request->width = border_width * 2;
  89   if (n_children > 1)
  90     request->width += spacing * (n_children - 1);
  91
  92   request->height = border_width * 2;
  93 }
  94
  95 void
  96 facade_hbox_add_child_size_request (gint hbox_border_width,
  97                                     const GtkRequisition *child_request,
  98                                     gint child_padding,
  99                                     GtkRequisition *request)
 100 {
 101   request->width += child_request->width + child_padding * 2;
 102   request->height = MAX (request->height,
 103                          hbox_border_width * 2 + child_request->height);
 104 }
 105
 106 void
 107 facade_arrow_get_size_request (gint xpad,
 108                                gint ypad,
 109                                GtkRequisition *request)
 110 {
 111 #define MIN_ARROW_SIZE 15
 112   request->width = MIN_ARROW_SIZE + xpad * 2;
 113   request->height = MIN_ARROW_SIZE + ypad * 2;
 114 }
 115
 116 void
 117 facade_alignment_get_size_request (gint border_width,
 118                                    gint padding_left,
 119                                    gint padding_right,
 120                                    gint padding_top,
 121                                    gint padding_bottom,
 122                                    const GtkRequisition *child_request,
 123                                    GtkRequisition *request)
 124 {
 125   request->width = (border_width * 2 + padding_left + padding_right
 126                     + child_request->width);
 127   request->height = (border_width * 2 + padding_top + padding_bottom
 128                      + child_request->height);
 129 }
 130
 131 void
 132 facade_label_get_size_request (gint xpad,
 133                                gint ypad,
 134                                GtkWidget *base,
 135                                const char *text,
 136                                GtkRequisition *request)
 137 {
 138   PangoLayout *layout;
 139
 140   layout = facade_label_get_layout (base, text);
 141   facade_label_get_size_request_from_layout (xpad, ypad, layout, request);
 142   g_object_unref (layout);
 143 }
 144
 145 void
 146 facade_label_get_size_request_from_layout (gint xpad,
 147                                            gint ypad,
 148                                            PangoLayout *layout,
 149                                            GtkRequisition *request)
 150 {
 151   PangoRectangle logical_rect;
 152
 153   pango_layout_get_extents (layout, NULL, &logical_rect);
 154   request->width = xpad * 2 + PANGO_PIXELS (logical_rect.width);
 155   request->height = ypad * 2 + PANGO_PIXELS (logical_rect.height);
 156 }
 157
 158 PangoLayout *
 159 facade_label_get_layout (GtkWidget *base,
 160                          const char *text)
 161 {
 162   PangoAlignment alignment;
 163   PangoLayout *layout;
 164   gboolean rtl;
 165
 166   rtl = gtk_widget_get_direction (base) == GTK_TEXT_DIR_RTL;
 167   alignment = rtl ? PANGO_ALIGN_RIGHT : PANGO_ALIGN_LEFT;
 168
 169   layout = gtk_widget_create_pango_layout (base, text);
 170   pango_layout_set_alignment (layout, alignment);
 171
 172   return layout;
 173 }
 174
 175 static void
 176 facade_button_get_inner_border (GtkStyle *button_style,
 177                                 GtkBorder *inner_border)
 178 {
 179   GtkBorder *tmp_border;
 180
 181   gtk_style_get (button_style, GTK_TYPE_BUTTON,
 182                  "inner-border", &tmp_border,
 183                  NULL);
 184
 185   if (tmp_border)
 186     {
 187       *inner_border = *tmp_border;
 188       gtk_border_free (tmp_border);
 189     }
 190   else
 191     {
 192       static const GtkBorder default_inner_border = { 1, 1, 1, 1 };
 193       *inner_border = default_inner_border;
 194     }
 195 }
 196
 197 void
 198 facade_button_get_size_request (gint border_width,
 199                                 GtkWidget *base,
 200                                 GtkStyle *button_style,
 201                                 const GtkRequisition *child_request,
 202                                 GtkRequisition *request)
 203 {
 204   GtkBorder inner_border;
 205   gint common_width;
 206   gint focus_width;
 207   gint focus_pad;
 208
 209   gtk_style_get (button_style, GTK_TYPE_BUTTON,
 210                  "focus-line-width", &focus_width,
 211                  "focus-padding", &focus_pad,
 212                  NULL);
 213   facade_button_get_inner_border (button_style, &inner_border);
 214
 215   common_width = 2 * (border_width + focus_width + focus_pad);
 216   request->width = (common_width
 217                     + 2 * button_style->xthickness
 218                     + inner_border.left + inner_border.right
 219                     + child_request->width);
 220   request->height = (common_width
 221                      + 2 * button_style->ythickness
 222                      + inner_border.top + inner_border.bottom
 223                      + child_request->height);
 224 }
 225
 226 void
 227 facade_button_get_focus_inset (gint border_width,
 228                                GtkWidget *base,
 229                                GtkStyle *button_style,
 230                                GtkBorder *focus_inset)
 231 {
 232   facade_button_get_inner_border (button_style, focus_inset);
 233   thicken_border (border_width + button_style->xthickness,
 234                   border_width + button_style->ythickness,
 235                   focus_inset);
 236 }
 237
 238 static void
 239 facade_button_get_label_inset (gint border_width,
 240                                GtkWidget *base,
 241                                GtkStyle *button_style,
 242                                GtkBorder *label_inset)
 243 {
 244   gint focus_width;
 245   gint focus_pad;
 246
 247   facade_button_get_focus_inset (border_width, base, button_style,
 248                                  label_inset);
 249
 250   gtk_style_get (button_style, GTK_TYPE_BUTTON,
 251                  "focus-line-width", &focus_width,
 252                  "focus-padding", &focus_pad,
 253                  NULL);
 254   thicken_border (focus_width + focus_pad,
 255                   focus_width + focus_pad,
 256                   label_inset);
 257 }
 258
 259 static void
 260 get_layout_location (GtkWidget *base,
 261                      const GdkRectangle *label_area,
 262                      PangoLayout *layout,
 263                      gint xpad,
 264                      gint ypad,
 265                      gfloat xalign,
 266                      gfloat yalign,
 267                      gint *x,
 268                      gint *y)
 269 {
 270   PangoRectangle logical;
 271   GtkRequisition req;
 272
 273   if (gtk_widget_get_direction (base) == GTK_TEXT_DIR_LTR)
 274     xalign = xalign;
 275   else
 276     xalign = 1.0 - xalign;
 277
 278   pango_layout_get_pixel_extents (layout, NULL, &logical);
 279
 280   facade_label_get_size_request_from_layout (xpad, ypad, layout, &req);
 281
 282   *x = floor (label_area->x + xpad + xalign * (label_area->width - req.width));
 283
 284   if (gtk_widget_get_direction (base) == GTK_TEXT_DIR_LTR)
 285     *x = MAX (*x, label_area->x + xpad);
 286   else
 287     *x = MIN (*x, label_area->x + label_area->width - xpad);
 288   *x -= logical.x;
 289
 290   /* bgo#315462 - For single-line labels, *do* align the requisition with
 291    * respect to the allocation, even if we are under-allocated.  For multi-line
 292    * labels, always show the top of the text when they are under-allocated.
 293    * The rationale is this:
 294    *
 295    * - Single-line labels appear in GtkButtons, and it is very easy to get them
 296    *   to be smaller than their requisition.  The button may clip the label,
 297    *   but the label will still be able to show most of itself and the focus
 298    *   rectangle.  Also, it is fairly easy to read a single line of clipped
 299    *   text.
 300    *
 301    * - Multi-line labels should not be clipped to showing "something in the
 302    *   middle".  You want to read the first line, at least, to get some
 303    *   context.
 304    */
 305   if (pango_layout_get_line_count (layout) == 1)
 306     *y = floor (label_area->y + ypad
 307                 + (label_area->height - req.height) * yalign);
 308   else
 309     *y = floor (label_area->y + ypad
 310                 + MAX (((label_area->height - req.height) * yalign),
 311                        0));
 312 }
 313
 314 void
 315 facade_button_render (GtkWidget *base,
 316                       cairo_t *cr,
 317                       const GdkRectangle *button_area,
 318                       gint border_width,
 319                       GtkStyle *button_style,
 320                       GtkStateType state_type,
 321
 322                       GtkStyle *label_style,
 323                       const gchar *label,
 324                       gint xpad,
 325                       gint ypad,
 326                       gfloat xalign,
 327                       gfloat yalign)
 328 {
 329   GdkRectangle label_area;
 330   PangoLayout *layout;
 331   GtkBorder inset;
 332   gint x, y;
 333
 334   /* Paint the button. */
 335   gtk_paint_box (button_style, cr,
 336                  state_type,
 337                  GTK_SHADOW_OUT, base, "button",
 338                  button_area->x + border_width,
 339                  button_area->y + border_width,
 340                  button_area->width - border_width * 2,
 341                  button_area->height - border_width * 2);
 342
 343   /* Figure out where the label should go. */
 344   facade_button_get_label_inset (border_width, base, button_style, &inset);
 345   inset_rectangle (button_area, &inset, &label_area);
 346
 347   /* Paint the label. */
 348   layout = facade_label_get_layout (base, label);
 349   get_layout_location (base, &label_area, layout, xpad, ypad, xalign, yalign,
 350                        &x, &y);
 351
 352   gtk_paint_layout (label_style, cr, state_type, FALSE,
 353                     base, "label", x, y, layout);
 354
 355   g_object_unref (layout);
 356 }
 357