src/gtk/win_gtk.cpp

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/gtk/win_gtk.cpp
   3 // Purpose:     native GTK+ widget for wxWindow
   4 // Author:      Paul Cornett
   5 // Id:          $Id$
   6 // Copyright:   (c) 2007 Paul Cornett
   7 // Licence:     wxWindows licence
   8 ///////////////////////////////////////////////////////////////////////////////
   9
  10 #include "wx/defs.h"
  11 #include "wx/gtk/win_gtk.h"
  12
  13 /*
  14 wxPizza is a custom GTK+ widget derived from GtkFixed.  A custom widget
  15 is needed to adapt GTK+ to wxWidgets needs in 3 areas: scrolling, window
  16 borders, and RTL.
  17
  18 For scrolling, the "set_scroll_adjustments" signal is implemented
  19 to make wxPizza appear scrollable to GTK+, allowing it to be put in a
  20 GtkScrolledWindow.  Child widget positions are adjusted for the scrolling
  21 position in size_allocate.  A second same-size GdkWindow is placed behind
  22 widget->window, to allow GDK to use a more efficient scrolling technique.
  23
  24 For borders, space is reserved in realize and size_allocate.
  25 For non-scrolling wxWindows, a second GdkWindow is used for the
  26 border; scrolling wxWindows draw their border on wxPizza's parent
  27 (a GtkScrolledWindow) GdkWindow.  Border widths for sunken and raised
  28 styles are taken from widget->style, so they will match the current theme.
  29
  30 For RTL, child widget positions are mirrored in size_allocate.
  31 */
  32
  33 static GtkWidgetClass* parent_class;
  34
  35 extern "C" {
  36
  37 struct wxPizzaClass
  38 {
  39     GtkFixedClass parent;
  40     void (*set_scroll_adjustments)(GtkWidget*, GtkAdjustment*, GtkAdjustment*);
  41 };
  42
  43 static void size_allocate(GtkWidget* widget, GtkAllocation* alloc)
  44 {
  45     const bool is_resize =
  46         widget->allocation.width  != alloc->width ||
  47         widget->allocation.height != alloc->height;
  48     const bool is_move =
  49         widget->allocation.x != alloc->x ||
  50         widget->allocation.y != alloc->y;
  51
  52     widget->allocation = *alloc;
  53
  54     wxPizza* pizza = WX_PIZZA(widget);
  55     int border_x, border_y;
  56     pizza->get_border_widths(border_x, border_y);
  57     int w = alloc->width - 2 * border_x;
  58     if (w < 0) w = 0;
  59
  60     if (GTK_WIDGET_REALIZED(widget) && (is_move || is_resize))
  61     {
  62         int h = alloc->height - 2 * border_y;
  63         if (h < 0) h = 0;
  64
  65         if (pizza->m_is_scrollable)
  66         {
  67             // two windows, both same size
  68             gdk_window_move_resize(pizza->m_backing_window,
  69                 alloc->x + border_x, alloc->y + border_y, w, h);
  70             if (is_resize)
  71                 gdk_window_resize(widget->window, w, h);
  72         }
  73         else if (pizza->m_backing_window)
  74         {
  75             // two windows, widget->window is smaller by border widths (need to
  76             // move widget->window as well as resize because border can change)
  77             gdk_window_move_resize(pizza->m_backing_window,
  78                 alloc->x, alloc->y, alloc->width, alloc->height);
  79             gdk_window_move_resize(widget->window, border_x, border_y, w, h);
  80         }
  81         else
  82         {
  83             // one window
  84             gdk_window_move_resize(widget->window,
  85                 alloc->x, alloc->y, alloc->width, alloc->height);
  86         }
  87         if (is_resize && pizza->m_backing_window)
  88         {
  89             // wxWidgets turns off redraw-on-allocate by default,
  90             // so border area needs to be invalidated
  91             if (border_x > 1 || border_y > 1)
  92             {
  93                 if (pizza->m_is_scrollable)
  94                     ; // invalidate does not seem to be needed in this case
  95                 else
  96                     gdk_window_invalidate_rect(pizza->m_backing_window, NULL, false);
  97             }
  98         }
  99     }
 100     // adjust child positions
 101     for (const GList* list = pizza->m_fixed.children; list; list = list->next)
 102     {
 103         const GtkFixedChild* child = static_cast<GtkFixedChild*>(list->data);
 104         if (GTK_WIDGET_VISIBLE(child->widget))
 105         {
 106             GtkAllocation child_alloc;
 107             // note that child positions do not take border into
 108             // account, they need to be relative to widget->window,
 109             // which has already been adjusted
 110             child_alloc.x = child->x - pizza->m_scroll_x;
 111             child_alloc.y = child->y - pizza->m_scroll_y;
 112             GtkRequisition req;
 113             gtk_widget_get_child_requisition(child->widget, &req);
 114             child_alloc.width  = req.width;
 115             child_alloc.height = req.height;
 116             if (gtk_widget_get_direction(widget) == GTK_TEXT_DIR_RTL)
 117             {
 118                 child_alloc.x = w - child_alloc.x - child_alloc.width;
 119             }
 120             gtk_widget_size_allocate(child->widget, &child_alloc);
 121         }
 122     }
 123 }
 124
 125 static void realize(GtkWidget* widget)
 126 {
 127     parent_class->realize(widget);
 128
 129     wxPizza* pizza = WX_PIZZA(widget);
 130     // second window is created if there is a border, or wxWindow is scrollable
 131     if (pizza->m_border_style || pizza->m_is_scrollable)
 132     {
 133         GdkWindowAttr attr;
 134         attr.event_mask = pizza->m_is_scrollable ? 0 : GDK_EXPOSURE_MASK;
 135         attr.x = widget->allocation.x;
 136         attr.y = widget->allocation.y;
 137         attr.width = widget->allocation.width;
 138         attr.height = widget->allocation.height;
 139         int border_x, border_y;
 140         pizza->get_border_widths(border_x, border_y);
 141         int w = widget->allocation.width  - 2 * border_x;
 142         int h = widget->allocation.height - 2 * border_y;
 143         if (w < 0) w = 0;
 144         if (h < 0) h = 0;
 145         if (pizza->m_is_scrollable)
 146         {
 147             attr.x += border_x;
 148             attr.y += border_y;
 149             attr.width  = w;
 150             attr.height = h;
 151         }
 152         attr.wclass = GDK_INPUT_OUTPUT;
 153         attr.visual = gtk_widget_get_visual(widget);
 154         attr.colormap = gtk_widget_get_colormap(widget);
 155         attr.window_type = GDK_WINDOW_CHILD;
 156
 157         pizza->m_backing_window = gdk_window_new(
 158             gdk_window_get_parent(widget->window),
 159             &attr,
 160             GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL | GDK_WA_COLORMAP);
 161
 162         gdk_window_set_user_data(pizza->m_backing_window, widget);
 163         if (pizza->m_is_scrollable)
 164             gdk_window_reparent(widget->window, pizza->m_backing_window, 0, 0);
 165         else
 166             gdk_window_reparent(widget->window, pizza->m_backing_window, border_x, border_y);
 167         gdk_window_resize(widget->window, w, h);
 168
 169         // Parts of m_backing_window which are supposed to be obscured may be
 170         // exposed temporarily while resizing. Setting the backing pixmap to
 171         // None prevents those areas from being briefly painted black.
 172         gdk_window_set_back_pixmap(pizza->m_backing_window, NULL, false);
 173     }
 174 }
 175
 176 static void unrealize(GtkWidget* widget)
 177 {
 178     parent_class->unrealize(widget);
 179
 180     wxPizza* pizza = WX_PIZZA(widget);
 181     if (pizza->m_backing_window)
 182     {
 183         gdk_window_set_user_data(pizza->m_backing_window, NULL);
 184         gdk_window_destroy(pizza->m_backing_window);
 185         pizza->m_backing_window = NULL;
 186     }
 187 }
 188
 189 static void map(GtkWidget* widget)
 190 {
 191     parent_class->map(widget);
 192
 193     wxPizza* pizza = WX_PIZZA(widget);
 194     if (pizza->m_backing_window)
 195         gdk_window_show(pizza->m_backing_window);
 196 }
 197
 198 static void unmap(GtkWidget* widget)
 199 {
 200     parent_class->unmap(widget);
 201
 202     wxPizza* pizza = WX_PIZZA(widget);
 203     if (pizza->m_backing_window)
 204         gdk_window_hide(pizza->m_backing_window);
 205 }
 206
 207 // not used, but needs to exist so gtk_widget_set_scroll_adjustments will work
 208 static void set_scroll_adjustments(GtkWidget*, GtkAdjustment*, GtkAdjustment*)
 209 {
 210 }
 211
 212 // Marshaller needed for set_scroll_adjustments signal,
 213 // generated with GLib-2.4.6 glib-genmarshal
 214 #define g_marshal_value_peek_object(v)   g_value_get_object (v)
 215 static void
 216 g_cclosure_user_marshal_VOID__OBJECT_OBJECT (GClosure     *closure,
 217                                              GValue       * /*return_value*/,
 218                                              guint         n_param_values,
 219                                              const GValue *param_values,
 220                                              gpointer      /*invocation_hint*/,
 221                                              gpointer      marshal_data)
 222 {
 223   typedef void (*GMarshalFunc_VOID__OBJECT_OBJECT) (gpointer     data1,
 224                                                     gpointer     arg_1,
 225                                                     gpointer     arg_2,
 226                                                     gpointer     data2);
 227   register GMarshalFunc_VOID__OBJECT_OBJECT callback;
 228   register GCClosure *cc = (GCClosure*) closure;
 229   register gpointer data1, data2;
 230
 231   g_return_if_fail (n_param_values == 3);
 232
 233   if (G_CCLOSURE_SWAP_DATA (closure))
 234     {
 235       data1 = closure->data;
 236       data2 = g_value_peek_pointer (param_values + 0);
 237     }
 238   else
 239     {
 240       data1 = g_value_peek_pointer (param_values + 0);
 241       data2 = closure->data;
 242     }
 243   callback = (GMarshalFunc_VOID__OBJECT_OBJECT) (marshal_data ? marshal_data : cc->callback);
 244
 245   callback (data1,
 246             g_marshal_value_peek_object (param_values + 1),
 247             g_marshal_value_peek_object (param_values + 2),
 248             data2);
 249 }
 250
 251 static void class_init(void* g_class, void*)
 252 {
 253     GtkWidgetClass* widget_class = (GtkWidgetClass*)g_class;
 254     widget_class->size_allocate = size_allocate;
 255     widget_class->realize = realize;
 256     widget_class->unrealize = unrealize;
 257     widget_class->map = map;
 258     widget_class->unmap = unmap;
 259     wxPizzaClass* klass = (wxPizzaClass*)g_class;
 260
 261     // needed to make widget appear scrollable to GTK+
 262     klass->set_scroll_adjustments = set_scroll_adjustments;
 263     widget_class->set_scroll_adjustments_signal =
 264         g_signal_new(
 265             "set_scroll_adjustments",
 266             G_TYPE_FROM_CLASS(g_class),
 267             G_SIGNAL_RUN_LAST,
 268             G_STRUCT_OFFSET(wxPizzaClass, set_scroll_adjustments),
 269             NULL, NULL,
 270             g_cclosure_user_marshal_VOID__OBJECT_OBJECT,
 271             G_TYPE_NONE, 2, GTK_TYPE_ADJUSTMENT, GTK_TYPE_ADJUSTMENT);
 272
 273     parent_class = GTK_WIDGET_CLASS(g_type_class_peek_parent(g_class));
 274 }
 275
 276 } // extern "C"
 277
 278 GType wxPizza::type()
 279 {
 280     static GtkType type;
 281     if (type == 0)
 282     {
 283         const GTypeInfo info = {
 284             sizeof(wxPizzaClass),
 285             NULL, NULL,
 286             class_init,
 287             NULL, NULL,
 288             sizeof(wxPizza), 0,
 289             NULL, NULL
 290         };
 291         type = g_type_register_static(
 292             GTK_TYPE_FIXED, "wxPizza", &info, GTypeFlags(0));
 293     }
 294     return type;
 295 }
 296
 297 GtkWidget* wxPizza::New(long windowStyle)
 298 {
 299     GtkWidget* widget = GTK_WIDGET(g_object_new(type(), NULL));
 300     wxPizza* pizza = WX_PIZZA(widget);
 301     pizza->m_backing_window = NULL;
 302     pizza->m_scroll_x = 0;
 303     pizza->m_scroll_y = 0;
 304     pizza->m_is_scrollable = (windowStyle & (wxHSCROLL | wxVSCROLL)) != 0;
 305     // mask off border styles not useable with wxPizza
 306     pizza->m_border_style = int(windowStyle & BORDER_STYLES);
 307     gtk_fixed_set_has_window(GTK_FIXED(widget), true);
 308     gtk_widget_add_events(widget,
 309         GDK_EXPOSURE_MASK |
 310         GDK_SCROLL_MASK |
 311         GDK_POINTER_MOTION_MASK |
 312         GDK_POINTER_MOTION_HINT_MASK |
 313         GDK_BUTTON_MOTION_MASK |
 314         GDK_BUTTON1_MOTION_MASK |
 315         GDK_BUTTON2_MOTION_MASK |
 316         GDK_BUTTON3_MOTION_MASK |
 317         GDK_BUTTON_PRESS_MASK |
 318         GDK_BUTTON_RELEASE_MASK |
 319         GDK_KEY_PRESS_MASK |
 320         GDK_KEY_RELEASE_MASK |
 321         GDK_ENTER_NOTIFY_MASK |
 322         GDK_LEAVE_NOTIFY_MASK |
 323         GDK_FOCUS_CHANGE_MASK);
 324     return widget;
 325 }
 326
 327 // gtk_fixed_move does not check for a change before issuing a queue_resize,
 328 // we need to avoid that to prevent endless sizing loops, so check first
 329 void wxPizza::move(GtkWidget* widget, int x, int y)
 330 {
 331     GtkFixed* fixed = &m_fixed;
 332     for (const GList* list = fixed->children; list; list = list->next)
 333     {
 334         const GtkFixedChild* child = static_cast<GtkFixedChild*>(list->data);
 335         if (child->widget == widget)
 336         {
 337             if (child->x != x || child->y != y)
 338                 gtk_fixed_move(fixed, widget, x, y);
 339             break;
 340         }
 341     }
 342 }
 343
 344 void wxPizza::scroll(int dx, int dy)
 345 {
 346     GtkWidget* widget = GTK_WIDGET(this);
 347     if (gtk_widget_get_direction(widget) == GTK_TEXT_DIR_RTL)
 348         dx = -dx;
 349     m_scroll_x -= dx;
 350     m_scroll_y -= dy;
 351     if (widget->window)
 352         gdk_window_scroll(widget->window, dx, dy);
 353     const GList* list = m_fixed.children;
 354     if (list)
 355     {
 356         const GtkFixedChild* child = static_cast<GtkFixedChild*>(list->data);
 357         // queueing a resize on any child will update them all
 358         gtk_widget_queue_resize(child->widget);
 359     }
 360 }
 361
 362 extern GtkWidget *GetEntryWidget();
 363
 364 void wxPizza::get_border_widths(int& x, int& y)
 365 {
 366     x = y = 0;
 367     if (m_border_style & wxBORDER_SIMPLE)
 368         x = y = 1;
 369     else if (m_border_style)
 370     {
 371         GtkWidget *entry_widget = GetEntryWidget();
 372         if (entry_widget->style)
 373         {
 374             x = entry_widget->style->xthickness;
 375             y = entry_widget->style->ythickness;
 376         }
 377     }
 378 }