src/ui/base/gtk/gtk_floating_container.cc

   1 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "ui/base/gtk/gtk_floating_container.h"
   6
   7 #include <gtk/gtk.h>
   8
   9 #include <algorithm>
  10
  11 #include "ui/gfx/gtk_compat.h"
  12
  13 namespace {
  14
  15 enum {
  16   SET_FLOATING_POSITION,
  17   LAST_SIGNAL
  18 };
  19
  20 enum {
  21   CHILD_PROP_0,
  22   CHILD_PROP_X,
  23   CHILD_PROP_Y
  24 };
  25
  26 // Returns the GtkFloatingContainerChild associated with |widget| (or NULL if
  27 // |widget| not found).
  28 GtkFloatingContainerChild* GetChild(GtkFloatingContainer* container,
  29                                     GtkWidget* widget) {
  30   for (GList* floating_children = container->floating_children;
  31        floating_children; floating_children = g_list_next(floating_children)) {
  32     GtkFloatingContainerChild* child =
  33         reinterpret_cast<GtkFloatingContainerChild*>(floating_children->data);
  34
  35     if (child->widget == widget)
  36       return child;
  37   }
  38
  39   return NULL;
  40 }
  41
  42 const GParamFlags kStaticReadWriteProp = static_cast<GParamFlags>(
  43     G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS);
  44
  45 }  // namespace
  46
  47 G_BEGIN_DECLS
  48
  49 static void gtk_floating_container_remove(GtkContainer* container,
  50                                           GtkWidget* widget);
  51 static void gtk_floating_container_forall(GtkContainer* container,
  52                                           gboolean include_internals,
  53                                           GtkCallback callback,
  54                                           gpointer callback_data);
  55 static void gtk_floating_container_size_request(GtkWidget* widget,
  56                                                 GtkRequisition* requisition);
  57 static void gtk_floating_container_size_allocate(GtkWidget* widget,
  58                                                  GtkAllocation* allocation);
  59 static void gtk_floating_container_set_child_property(GtkContainer* container,
  60                                                       GtkWidget* child,
  61                                                       guint property_id,
  62                                                       const GValue* value,
  63                                                       GParamSpec* pspec);
  64 static void gtk_floating_container_get_child_property(GtkContainer* container,
  65                                                       GtkWidget* child,
  66                                                       guint property_id,
  67                                                       GValue* value,
  68                                                       GParamSpec* pspec);
  69
  70 static guint floating_container_signals[LAST_SIGNAL] = { 0 };
  71
  72 G_DEFINE_TYPE(GtkFloatingContainer, gtk_floating_container, GTK_TYPE_BIN)
  73
  74 static void gtk_floating_container_class_init(
  75     GtkFloatingContainerClass *klass) {
  76   GtkObjectClass* object_class =
  77       reinterpret_cast<GtkObjectClass*>(klass);
  78
  79   GtkWidgetClass* widget_class =
  80       reinterpret_cast<GtkWidgetClass*>(klass);
  81   widget_class->size_request = gtk_floating_container_size_request;
  82   widget_class->size_allocate = gtk_floating_container_size_allocate;
  83
  84   GtkContainerClass* container_class =
  85       reinterpret_cast<GtkContainerClass*>(klass);
  86   container_class->remove = gtk_floating_container_remove;
  87   container_class->forall = gtk_floating_container_forall;
  88
  89   container_class->set_child_property =
  90       gtk_floating_container_set_child_property;
  91   container_class->get_child_property =
  92       gtk_floating_container_get_child_property;
  93
  94   gtk_container_class_install_child_property(
  95       container_class,
  96       CHILD_PROP_X,
  97       g_param_spec_int("x",
  98                        "X position",
  99                        "X position of child widget",
 100                        G_MININT,
 101                        G_MAXINT,
 102                        0,
 103                        kStaticReadWriteProp));
 104
 105   gtk_container_class_install_child_property(
 106       container_class,
 107       CHILD_PROP_Y,
 108       g_param_spec_int("y",
 109                        "Y position",
 110                        "Y position of child widget",
 111                        G_MININT,
 112                        G_MAXINT,
 113                        0,
 114                        kStaticReadWriteProp));
 115
 116   floating_container_signals[SET_FLOATING_POSITION] =
 117       g_signal_new("set-floating-position",
 118                    G_OBJECT_CLASS_TYPE(object_class),
 119                    static_cast<GSignalFlags>(G_SIGNAL_RUN_FIRST |
 120                                              G_SIGNAL_ACTION),
 121                    0,
 122                    NULL, NULL,
 123                    g_cclosure_marshal_VOID__BOXED,
 124                    G_TYPE_NONE, 1,
 125                    GDK_TYPE_RECTANGLE | G_SIGNAL_TYPE_STATIC_SCOPE);
 126 }
 127
 128 static void gtk_floating_container_init(GtkFloatingContainer* container) {
 129   gtk_widget_set_has_window(GTK_WIDGET(container), FALSE);
 130   container->floating_children = NULL;
 131 }
 132
 133 static void gtk_floating_container_remove(GtkContainer* container,
 134                                           GtkWidget* widget) {
 135   g_return_if_fail(GTK_IS_WIDGET(widget));
 136
 137   GtkBin* bin = GTK_BIN(container);
 138   if (gtk_bin_get_child(bin) == widget) {
 139     ((GTK_CONTAINER_CLASS(gtk_floating_container_parent_class))->remove)
 140         (container, widget);
 141   } else {
 142     // Handle the other case where it's in our |floating_children| list.
 143     GtkFloatingContainer* floating = GTK_FLOATING_CONTAINER(container);
 144     GList* children = floating->floating_children;
 145     gboolean removed_child = false;
 146     while (children) {
 147       GtkFloatingContainerChild* child =
 148           reinterpret_cast<GtkFloatingContainerChild*>(children->data);
 149
 150       if (child->widget == widget) {
 151         removed_child = true;
 152         gboolean was_visible = gtk_widget_get_visible(GTK_WIDGET(widget));
 153
 154         gtk_widget_unparent(widget);
 155
 156         floating->floating_children =
 157             g_list_remove_link(floating->floating_children, children);
 158         g_list_free(children);
 159         g_free(child);
 160
 161         if (was_visible && gtk_widget_get_visible(GTK_WIDGET(container)))
 162           gtk_widget_queue_resize(GTK_WIDGET(container));
 163
 164         break;
 165       }
 166       children = children->next;
 167     }
 168
 169     g_return_if_fail(removed_child);
 170   }
 171 }
 172
 173 static void gtk_floating_container_forall(GtkContainer* container,
 174                                           gboolean include_internals,
 175                                           GtkCallback callback,
 176                                           gpointer callback_data) {
 177   g_return_if_fail(container != NULL);
 178   g_return_if_fail(callback != NULL);
 179
 180   // Let GtkBin do its part of the forall.
 181   ((GTK_CONTAINER_CLASS(gtk_floating_container_parent_class))->forall)
 182       (container, include_internals, callback, callback_data);
 183
 184   GtkFloatingContainer* floating = GTK_FLOATING_CONTAINER(container);
 185   GList* children = floating->floating_children;
 186   while (children) {
 187     GtkFloatingContainerChild* child =
 188         reinterpret_cast<GtkFloatingContainerChild*>(children->data);
 189     children = children->next;
 190
 191     (*callback)(child->widget, callback_data);
 192   }
 193 }
 194
 195 static void gtk_floating_container_size_request(GtkWidget* widget,
 196                                                 GtkRequisition* requisition) {
 197   GtkBin* bin = GTK_BIN(widget);
 198   if (bin && gtk_bin_get_child(bin)) {
 199     gtk_widget_size_request(gtk_bin_get_child(bin), requisition);
 200   } else {
 201     requisition->width = 0;
 202     requisition->height = 0;
 203   }
 204 }
 205
 206 static void gtk_floating_container_size_allocate(GtkWidget* widget,
 207                                                  GtkAllocation* allocation) {
 208   gtk_widget_set_allocation(widget, allocation);
 209
 210   if (gtk_widget_get_has_window(widget) && gtk_widget_get_realized(widget)) {
 211     gdk_window_move_resize(gtk_widget_get_window(widget),
 212                            allocation->x,
 213                            allocation->y,
 214                            allocation->width,
 215                            allocation->height);
 216   }
 217
 218   // Give the same allocation to our GtkBin component.
 219   GtkBin* bin = GTK_BIN(widget);
 220   if (gtk_bin_get_child(bin)) {
 221     gtk_widget_size_allocate(gtk_bin_get_child(bin), allocation);
 222   }
 223
 224   // We need to give whoever is pulling our strings a chance to set the "x" and
 225   // "y" properties on all of our children.
 226   g_signal_emit(widget, floating_container_signals[SET_FLOATING_POSITION], 0,
 227                 allocation);
 228
 229   // Our allocation has been set. We've asked our controller to place the other
 230   // widgets. Pass out allocations to all our children based on where they want
 231   // to be.
 232   GtkFloatingContainer* container = GTK_FLOATING_CONTAINER(widget);
 233   GList* children = container->floating_children;
 234   GtkAllocation child_allocation;
 235   GtkRequisition child_requisition;
 236   while (children) {
 237     GtkFloatingContainerChild* child =
 238         reinterpret_cast<GtkFloatingContainerChild*>(children->data);
 239     children = children->next;
 240
 241     if (gtk_widget_get_visible(GTK_WIDGET(child->widget))) {
 242       gtk_widget_size_request(child->widget, &child_requisition);
 243       child_allocation.x = allocation->x + child->x;
 244       child_allocation.y = allocation->y + child->y;
 245       child_allocation.width = std::max(1, std::min(child_requisition.width,
 246                                                     allocation->width));
 247       child_allocation.height = std::max(1, std::min(child_requisition.height,
 248                                                      allocation->height));
 249       gtk_widget_size_allocate(child->widget, &child_allocation);
 250     }
 251   }
 252 }
 253
 254 static void gtk_floating_container_set_child_property(GtkContainer* container,
 255                                                       GtkWidget* child,
 256                                                       guint property_id,
 257                                                       const GValue* value,
 258                                                       GParamSpec* pspec) {
 259   GtkFloatingContainerChild* floating_child =
 260       GetChild(GTK_FLOATING_CONTAINER(container), child);
 261   g_return_if_fail(floating_child);
 262
 263   switch (property_id) {
 264     case CHILD_PROP_X:
 265       floating_child->x = g_value_get_int(value);
 266       gtk_widget_child_notify(child, "x");
 267       break;
 268     case CHILD_PROP_Y:
 269       floating_child->y = g_value_get_int(value);
 270       gtk_widget_child_notify(child, "y");
 271       break;
 272     default:
 273       GTK_CONTAINER_WARN_INVALID_CHILD_PROPERTY_ID(
 274           container, property_id, pspec);
 275       break;
 276   };
 277 }
 278
 279 static void gtk_floating_container_get_child_property(GtkContainer* container,
 280                                                       GtkWidget* child,
 281                                                       guint property_id,
 282                                                       GValue* value,
 283                                                       GParamSpec* pspec) {
 284   GtkFloatingContainerChild* floating_child =
 285       GetChild(GTK_FLOATING_CONTAINER(container), child);
 286   g_return_if_fail(floating_child);
 287
 288   switch (property_id) {
 289     case CHILD_PROP_X:
 290       g_value_set_int(value, floating_child->x);
 291       break;
 292     case CHILD_PROP_Y:
 293       g_value_set_int(value, floating_child->y);
 294       break;
 295     default:
 296       GTK_CONTAINER_WARN_INVALID_CHILD_PROPERTY_ID(
 297           container, property_id, pspec);
 298       break;
 299   };
 300 }
 301
 302 GtkWidget* gtk_floating_container_new() {
 303   return GTK_WIDGET(g_object_new(GTK_TYPE_FLOATING_CONTAINER, NULL));
 304 }
 305
 306 void gtk_floating_container_add_floating(GtkFloatingContainer* container,
 307                                          GtkWidget* widget) {
 308   g_return_if_fail(GTK_IS_FLOATING_CONTAINER(container));
 309   g_return_if_fail(GTK_IS_WIDGET(widget));
 310
 311   GtkFloatingContainerChild* child_info = g_new(GtkFloatingContainerChild, 1);
 312   child_info->widget = widget;
 313   child_info->x = 0;
 314   child_info->y = 0;
 315
 316   gtk_widget_set_parent(widget, GTK_WIDGET(container));
 317
 318   container->floating_children =
 319       g_list_append(container->floating_children, child_info);
 320 }
 321
 322 G_END_DECLS