aspectbin.c

   1 #include <stdio.h>
   2 #include "aspectbin.h"
   3
   4 enum {
   5         PROP_0,
   6         PROP_CONSTRAIN,
   7         PROP_FILL,
   8 };
   9
  10 static void aspect_bin_size_request(GtkWidget *, GtkRequisition *);
  11 static void aspect_bin_size_allocate(GtkWidget *, GtkAllocation *);
  12 static void aspect_bin_add(GtkContainer *, GtkWidget *);
  13 static void aspect_bin_remove(GtkContainer *, GtkWidget *);
  14 static void aspect_bin_forall(GtkContainer *, gboolean, GtkCallback, gpointer);
  15 static GType aspect_bin_child_type(GtkContainer *);
  16
  17 static void aspect_bin_get_property(GObject *, guint, GValue *, GParamSpec *);
  18 static void aspect_bin_set_property(GObject *, guint, const GValue *,
  19                                                           GParamSpec *);
  20
  21 G_DEFINE_TYPE(AspectBin, aspect_bin, GTK_TYPE_CONTAINER)
  22
  23 static void aspect_bin_init(AspectBin *abin)
  24 {
  25         GTK_WIDGET_SET_FLAGS(abin, GTK_NO_WINDOW);
  26
  27         abin->body      = NULL;
  28         abin->side      = NULL;
  29         abin->ratio     = 1;
  30         abin->align     = 0;
  31         abin->constrain = FALSE;
  32         abin->fill      = TRUE;
  33 }
  34
  35 static void aspect_bin_class_init(AspectBinClass *class)
  36 {
  37         GObjectClass      *object_class    = G_OBJECT_CLASS(class);
  38         GtkWidgetClass    *widget_class    = GTK_WIDGET_CLASS(class);
  39         GtkContainerClass *container_class = GTK_CONTAINER_CLASS(class);
  40
  41         widget_class->size_request  = aspect_bin_size_request;
  42         widget_class->size_allocate = aspect_bin_size_allocate;
  43
  44         container_class->add        = aspect_bin_add;
  45         container_class->remove     = aspect_bin_remove;
  46         container_class->forall     = aspect_bin_forall;
  47         container_class->child_type = aspect_bin_child_type;
  48
  49         object_class->set_property = aspect_bin_set_property;
  50         object_class->get_property = aspect_bin_get_property;
  51
  52         g_object_class_install_property(object_class,
  53                 PROP_FILL,
  54                 g_param_spec_boolean("fill",
  55                         "Fill",
  56                         "Allocate all remaining space to the side.",
  57                         TRUE,
  58                         G_PARAM_READWRITE));
  59         g_object_class_install_property(object_class,
  60                 PROP_CONSTRAIN,
  61                 g_param_spec_boolean("constrain",
  62                         "Constrain",
  63                         "Only expand the side to be as large as the body.",
  64                         FALSE,
  65                         G_PARAM_READWRITE));
  66 }
  67
  68 GtkWidget *aspect_bin_new(void)
  69 {
  70         return GTK_WIDGET(g_object_new(ASPECT_BIN_TYPE, NULL));
  71 }
  72
  73 static void aspect_bin_set_property(GObject      *object,
  74                                     guint         prop_id,
  75                                     const GValue *value,
  76                                     GParamSpec   *pspec)
  77 {
  78         AspectBin *abin = ASPECT_BIN(object);
  79
  80         switch (prop_id) {
  81         case PROP_CONSTRAIN:
  82                 abin->constrain = g_value_get_boolean(value);
  83                 gtk_widget_queue_resize(GTK_WIDGET(abin));
  84                 break;
  85         case PROP_FILL:
  86                 abin->fill = g_value_get_boolean(value);
  87                 gtk_widget_queue_resize(GTK_WIDGET(abin));
  88                 break;
  89         default:
  90                 G_OBJECT_WARN_INVALID_PROPERTY_ID(object, prop_id, pspec);
  91         }
  92 }
  93
  94 static void aspect_bin_get_property(GObject    *object,
  95                                     guint       prop_id,
  96                                     GValue     *value,
  97                                     GParamSpec *pspec)
  98 {
  99         AspectBin *abin = ASPECT_BIN(object);
 100
 101         switch (prop_id) {
 102         case PROP_CONSTRAIN:
 103                 g_value_set_boolean(value, abin->constrain);
 104                 break;
 105         case PROP_FILL:
 106                 g_value_set_boolean(value, abin->fill);
 107                 break;
 108         default:
 109                 G_OBJECT_WARN_INVALID_PROPERTY_ID(object, prop_id, pspec);
 110         }
 111 }
 112
 113 static void aspect_bin_add(GtkContainer *container, GtkWidget *widget)
 114 {
 115         AspectBin *abin;
 116         g_return_if_fail(IS_ASPECT_BIN(container));
 117         abin = ASPECT_BIN(container);
 118
 119         if (!abin->body)
 120                 aspect_bin_set_body(abin, widget, 1);
 121         else if (!abin->side)
 122                 aspect_bin_set_side(abin, widget);
 123         else
 124                 g_warning("AspectBin cannot have more than 2 children.\n");
 125 }
 126
 127 static void aspect_bin_remove(GtkContainer *container, GtkWidget *child)
 128 {
 129         AspectBin *abin = ASPECT_BIN(container);
 130
 131         if (abin->body == child) {
 132                 aspect_bin_set_body(abin, NULL, 1);
 133         } else if (abin->side == child) {
 134                 aspect_bin_set_side(abin, NULL);
 135         }
 136 }
 137
 138 static void aspect_bin_forall(GtkContainer *container,
 139                               gboolean      include_internals,
 140                               GtkCallback   callback,
 141                               gpointer      callback_data)
 142 {
 143         AspectBin *abin = ASPECT_BIN(container);
 144         g_return_if_fail(callback != NULL);
 145
 146         if (abin->body)
 147                 callback(abin->body, callback_data);
 148         if (abin->side)
 149                 callback(abin->side, callback_data);
 150 }
 151
 152 static GType aspect_bin_child_type(GtkContainer *container)
 153 {
 154         if (!ASPECT_BIN(container)->body || !ASPECT_BIN(container)->side)
 155                 return GTK_TYPE_WIDGET;
 156         return G_TYPE_NONE;
 157 }
 158
 159 static void
 160 aspect_bin_size_request(GtkWidget *widget, GtkRequisition *requisition)
 161 {
 162         AspectBin *abin = ASPECT_BIN(widget);
 163         GtkRequisition creq = {0}, areq = {0};
 164
 165         if (abin->side && GTK_WIDGET_VISIBLE(abin->side)) {
 166                 gtk_widget_size_request(abin->side, &creq);
 167         }
 168
 169         if (abin->body && GTK_WIDGET_VISIBLE(abin->body)) {
 170                 int wtmp, htmp;
 171                 gtk_widget_size_request(abin->body, &areq);
 172                 wtmp = areq.height * abin->ratio + 0.5;
 173                 htmp = areq.width  / abin->ratio + 0.5;
 174
 175                 if (wtmp > areq.width) {
 176                         areq.width  = wtmp;
 177                 } else {
 178                         areq.height = htmp;
 179                 }
 180         }
 181
 182         requisition->width  = areq.width + creq.width;
 183         requisition->height = MAX(areq.height, creq.height);
 184 }
 185
 186 static void
 187 aspect_bin_size_allocate(GtkWidget *widget, GtkAllocation *allocation)
 188 {
 189         AspectBin *abin = ASPECT_BIN(widget);
 190         GtkRequisition creq = {0};
 191         GtkAllocation csize = {0}, asize = {0};
 192
 193         /* First find the best fit for the body. */
 194         if (abin->body && GTK_WIDGET_VISIBLE(abin->body)) {
 195                 asize.height = allocation->height;
 196                 asize.width  = asize.height * abin->ratio + 0.5;
 197
 198                 if (asize.width > allocation->width) {
 199                         asize.width  = allocation->width;
 200                         asize.height = asize.width / abin->ratio + 0.5;
 201                 }
 202         }
 203
 204         /* Now try to fit the side. */
 205         if (abin->side && GTK_WIDGET_VISIBLE(abin->side)) {
 206                 gtk_widget_get_child_requisition(abin->side, &creq);
 207
 208                 if (allocation->width - asize.width < creq.width) {
 209                         /* It didn't fit, squish the constrained guy. */
 210                         asize.width  = allocation->width - creq.width;
 211                         asize.height = asize.width / abin->ratio + 0.5;
 212                 }
 213
 214                 csize.width  = allocation->width - asize.width;
 215                 csize.x = asize.width;
 216
 217                 if (abin->fill && abin->constrain) {
 218                         csize.height = asize.height;
 219                 } else if (abin->fill) {
 220                         csize.height = allocation->height;
 221                 } else {
 222                         csize.height = creq.height;
 223                 }
 224         }
 225
 226         csize.y = (allocation->height - csize.height) * abin->align + 0.5;
 227         asize.y = (allocation->height - asize.height) * abin->align + 0.5;
 228
 229         if (abin->body)
 230                 gtk_widget_size_allocate(abin->body, &asize);
 231         if (abin->side)
 232                 gtk_widget_size_allocate(abin->side, &csize);
 233 }
 234
 235 static gboolean
 236 set_widget(GtkWidget **dest, GtkWidget *parent, GtkWidget *widget)
 237 {
 238         gboolean need_resize = FALSE;
 239
 240         if (*dest == widget)
 241                 return FALSE;
 242
 243         if (*dest) {
 244                 need_resize |= GTK_WIDGET_VISIBLE(*dest);
 245                 gtk_widget_unparent(*dest);
 246         }
 247
 248         *dest = widget;
 249         if (widget) {
 250                 gtk_widget_set_parent(widget, parent);
 251                 need_resize |= GTK_WIDGET_VISIBLE(widget);
 252         }
 253
 254         return GTK_WIDGET_VISIBLE(parent) && need_resize;
 255 }
 256
 257 void aspect_bin_set_body(AspectBin *abin, GtkWidget *widget, gfloat ratio)
 258 {
 259         g_return_if_fail(IS_ASPECT_BIN(abin));
 260         g_return_if_fail(widget == NULL || GTK_IS_WIDGET(widget));
 261         g_return_if_fail(widget == NULL || widget->parent == NULL);
 262
 263         if (set_widget(&abin->body, GTK_WIDGET(abin), widget))
 264                 gtk_widget_queue_resize(GTK_WIDGET(abin));
 265 }
 266
 267 void aspect_bin_set_side(AspectBin *abin, GtkWidget *widget)
 268 {
 269         g_return_if_fail(IS_ASPECT_BIN(abin));
 270         g_return_if_fail(widget == NULL || GTK_IS_WIDGET(widget));
 271         g_return_if_fail(widget == NULL || widget->parent == NULL);
 272
 273         if (set_widget(&abin->side, GTK_WIDGET(abin), widget))
 274                 gtk_widget_queue_resize(GTK_WIDGET(abin));
 275 }
 276
 277 GtkWidget *aspect_bin_get_body(AspectBin *abin)
 278 {
 279         g_return_val_if_fail(IS_ASPECT_BIN(abin), NULL);
 280         return abin->body;
 281 }
 282
 283 GtkWidget *aspect_bin_get_side(AspectBin *abin)
 284 {
 285         g_return_val_if_fail(IS_ASPECT_BIN(abin), NULL);
 286         return abin->side;
 287 }