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/private.h"
  12 #include "wx/gtk/private/win_gtk.h"
  13
  14 /*
  15 wxPizza is a custom GTK+ widget derived from GtkFixed.  A custom widget
  16 is needed to adapt GTK+ to wxWidgets needs in 3 areas: scrolling, window
  17 borders, and RTL.
  18
  19 For scrolling, the "set_scroll_adjustments" signal is implemented
  20 to make wxPizza appear scrollable to GTK+, allowing it to be put in a
  21 GtkScrolledWindow.  Child widget positions are adjusted for the scrolling
  22 position in size_allocate.  A second same-size GdkWindow is placed behind
  23 widget->window, to allow GDK to use a more efficient scrolling technique.
  24
  25 For borders, space is reserved in realize and size_allocate.  The border is
  26 drawn on wxPizza's parent GdkWindow.
  27
  28 For RTL, child widget positions are mirrored in size_allocate.
  29 */
  30
  31 static GtkWidgetClass* parent_class;
  32
  33 extern "C" {
  34
  35 struct wxPizzaClass
  36 {
  37     GtkFixedClass parent;
  38     void (*set_scroll_adjustments)(GtkWidget*, GtkAdjustment*, GtkAdjustment*);
  39 };
  40
  41 static void size_allocate(GtkWidget* widget, GtkAllocation* alloc)
  42 {
  43     const bool is_resize =
  44         widget->allocation.width  != alloc->width ||
  45         widget->allocation.height != alloc->height;
  46     const bool is_move =
  47         widget->allocation.x != alloc->x ||
  48         widget->allocation.y != alloc->y;
  49
  50     wxPizza* pizza = WX_PIZZA(widget);
  51     int border_x, border_y;
  52     pizza->get_border_widths(border_x, border_y);
  53     int w = alloc->width - 2 * border_x;
  54     if (w < 0) w = 0;
  55
  56     if (GTK_WIDGET_REALIZED(widget) && (is_move || is_resize))
  57     {
  58         int h = alloc->height - 2 * border_y;
  59         if (h < 0) h = 0;
  60
  61         if (pizza->m_is_scrollable)
  62         {
  63             // two windows, both same size
  64             gdk_window_move_resize(pizza->m_backing_window,
  65                 alloc->x + border_x, alloc->y + border_y, w, h);
  66             if (is_resize)
  67                 gdk_window_resize(widget->window, w, h);
  68         }
  69         else
  70         {
  71             // one window
  72             gdk_window_move_resize(widget->window,
  73                 alloc->x + border_x, alloc->y + border_y, w, h);
  74
  75             if (is_resize && (border_x || border_y))
  76             {
  77                 // old and new border areas need to be invalidated,
  78                 // otherwise they will not be erased/redrawn properly
  79                 const GtkAllocation& a1 = widget->allocation;
  80                 const GtkAllocation& a2 = *alloc;
  81                 GdkRectangle r1 = { a1.x, a1.y, a1.width, a1.height };
  82                 GdkRectangle r2 = { a2.x, a2.y, a2.width, a2.height };
  83                 gdk_window_invalidate_rect(widget->parent->window, &r1, false);
  84                 gdk_window_invalidate_rect(widget->parent->window, &r2, false);
  85             }
  86         }
  87     }
  88
  89     widget->allocation = *alloc;
  90
  91     // adjust child positions
  92     for (const GList* list = pizza->m_fixed.children; list; list = list->next)
  93     {
  94         const GtkFixedChild* child = static_cast<GtkFixedChild*>(list->data);
  95         if (GTK_WIDGET_VISIBLE(child->widget))
  96         {
  97             GtkAllocation child_alloc;
  98             // note that child positions do not take border into
  99             // account, they need to be relative to widget->window,
 100             // which has already been adjusted
 101             child_alloc.x = child->x - pizza->m_scroll_x;
 102             child_alloc.y = child->y - pizza->m_scroll_y;
 103             GtkRequisition req;
 104             gtk_widget_get_child_requisition(child->widget, &req);
 105             child_alloc.width  = req.width;
 106             child_alloc.height = req.height;
 107             if (gtk_widget_get_direction(widget) == GTK_TEXT_DIR_RTL)
 108             {
 109                 child_alloc.x = w - child_alloc.x - child_alloc.width;
 110             }
 111             gtk_widget_size_allocate(child->widget, &child_alloc);
 112         }
 113     }
 114 }
 115
 116 static void realize(GtkWidget* widget)
 117 {
 118     parent_class->realize(widget);
 119
 120     wxPizza* pizza = WX_PIZZA(widget);
 121     if (pizza->m_border_style || pizza->m_is_scrollable)
 122     {
 123         int border_x, border_y;
 124         pizza->get_border_widths(border_x, border_y);
 125         int x = widget->allocation.x + border_x;
 126         int y = widget->allocation.y + border_y;
 127         int w = widget->allocation.width  - 2 * border_x;
 128         int h = widget->allocation.height - 2 * border_y;
 129         if (w < 0) w = 0;
 130         if (h < 0) h = 0;
 131         if (pizza->m_is_scrollable)
 132         {
 133             // second window is created if wxWindow is scrollable
 134             GdkWindowAttr attr;
 135             attr.event_mask = 0;
 136             attr.x = x;
 137             attr.y = y;
 138             attr.width  = w;
 139             attr.height = h;
 140             attr.wclass = GDK_INPUT_OUTPUT;
 141             attr.visual = gtk_widget_get_visual(widget);
 142             attr.colormap = gtk_widget_get_colormap(widget);
 143             attr.window_type = GDK_WINDOW_CHILD;
 144
 145             pizza->m_backing_window = gdk_window_new(
 146                 gdk_window_get_parent(widget->window),
 147                 &attr,
 148                 GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL | GDK_WA_COLORMAP);
 149
 150             gdk_window_set_user_data(pizza->m_backing_window, widget);
 151             gdk_window_reparent(widget->window, pizza->m_backing_window, 0, 0);
 152             gdk_window_resize(widget->window, w, h);
 153
 154             // Parts of m_backing_window may be exposed temporarily while
 155             // resizing. Setting the backing pixmap to None prevents those
 156             // areas from being briefly painted black.
 157             gdk_window_set_back_pixmap(pizza->m_backing_window, NULL, false);
 158         }
 159         else
 160             gdk_window_move_resize(widget->window, x, y, w, h);
 161     }
 162 }
 163
 164 static void unrealize(GtkWidget* widget)
 165 {
 166     parent_class->unrealize(widget);
 167
 168     wxPizza* pizza = WX_PIZZA(widget);
 169     if (pizza->m_backing_window)
 170     {
 171         gdk_window_set_user_data(pizza->m_backing_window, NULL);
 172         gdk_window_destroy(pizza->m_backing_window);
 173         pizza->m_backing_window = NULL;
 174     }
 175 }
 176
 177 static void map(GtkWidget* widget)
 178 {
 179     parent_class->map(widget);
 180
 181     wxPizza* pizza = WX_PIZZA(widget);
 182     if (pizza->m_backing_window)
 183         gdk_window_show(pizza->m_backing_window);
 184 }
 185
 186 static void unmap(GtkWidget* widget)
 187 {
 188     parent_class->unmap(widget);
 189
 190     wxPizza* pizza = WX_PIZZA(widget);
 191     if (pizza->m_backing_window)
 192         gdk_window_hide(pizza->m_backing_window);
 193 }
 194
 195 // not used, but needs to exist so gtk_widget_set_scroll_adjustments will work
 196 static void set_scroll_adjustments(GtkWidget*, GtkAdjustment*, GtkAdjustment*)
 197 {
 198 }
 199
 200 // Marshaller needed for set_scroll_adjustments signal,
 201 // generated with GLib-2.4.6 glib-genmarshal
 202 #define g_marshal_value_peek_object(v)   g_value_get_object (v)
 203 static void
 204 g_cclosure_user_marshal_VOID__OBJECT_OBJECT (GClosure     *closure,
 205                                              GValue       * /*return_value*/,
 206                                              guint         n_param_values,
 207                                              const GValue *param_values,
 208                                              gpointer      /*invocation_hint*/,
 209                                              gpointer      marshal_data)
 210 {
 211   typedef void (*GMarshalFunc_VOID__OBJECT_OBJECT) (gpointer     data1,
 212                                                     gpointer     arg_1,
 213                                                     gpointer     arg_2,
 214                                                     gpointer     data2);
 215   register GMarshalFunc_VOID__OBJECT_OBJECT callback;
 216   register GCClosure *cc = (GCClosure*) closure;
 217   register gpointer data1, data2;
 218
 219   g_return_if_fail (n_param_values == 3);
 220
 221   if (G_CCLOSURE_SWAP_DATA (closure))
 222     {
 223       data1 = closure->data;
 224       data2 = g_value_peek_pointer (param_values + 0);
 225     }
 226   else
 227     {
 228       data1 = g_value_peek_pointer (param_values + 0);
 229       data2 = closure->data;
 230     }
 231   callback = (GMarshalFunc_VOID__OBJECT_OBJECT) (marshal_data ? marshal_data : cc->callback);
 232
 233   callback (data1,
 234             g_marshal_value_peek_object (param_values + 1),
 235             g_marshal_value_peek_object (param_values + 2),
 236             data2);
 237 }
 238
 239 static void class_init(void* g_class, void*)
 240 {
 241     GtkWidgetClass* widget_class = (GtkWidgetClass*)g_class;
 242     widget_class->size_allocate = size_allocate;
 243     widget_class->realize = realize;
 244     widget_class->unrealize = unrealize;
 245     widget_class->map = map;
 246     widget_class->unmap = unmap;
 247     wxPizzaClass* klass = (wxPizzaClass*)g_class;
 248
 249     // needed to make widget appear scrollable to GTK+
 250     klass->set_scroll_adjustments = set_scroll_adjustments;
 251     widget_class->set_scroll_adjustments_signal =
 252         g_signal_new(
 253             "set_scroll_adjustments",
 254             G_TYPE_FROM_CLASS(g_class),
 255             G_SIGNAL_RUN_LAST,
 256             G_STRUCT_OFFSET(wxPizzaClass, set_scroll_adjustments),
 257             NULL, NULL,
 258             g_cclosure_user_marshal_VOID__OBJECT_OBJECT,
 259             G_TYPE_NONE, 2, GTK_TYPE_ADJUSTMENT, GTK_TYPE_ADJUSTMENT);
 260
 261     parent_class = GTK_WIDGET_CLASS(g_type_class_peek_parent(g_class));
 262 }
 263
 264 } // extern "C"
 265
 266 GType wxPizza::type()
 267 {
 268     static GtkType type;
 269     if (type == 0)
 270     {
 271         const GTypeInfo info = {
 272             sizeof(wxPizzaClass),
 273             NULL, NULL,
 274             class_init,
 275             NULL, NULL,
 276             sizeof(wxPizza), 0,
 277             NULL, NULL
 278         };
 279         type = g_type_register_static(
 280             GTK_TYPE_FIXED, "wxPizza", &info, GTypeFlags(0));
 281     }
 282     return type;
 283 }
 284
 285 GtkWidget* wxPizza::New(long windowStyle)
 286 {
 287     GtkWidget* widget = GTK_WIDGET(g_object_new(type(), NULL));
 288     wxPizza* pizza = WX_PIZZA(widget);
 289     pizza->m_backing_window = NULL;
 290     pizza->m_scroll_x = 0;
 291     pizza->m_scroll_y = 0;
 292     pizza->m_is_scrollable = (windowStyle & (wxHSCROLL | wxVSCROLL)) != 0;
 293     // mask off border styles not useable with wxPizza
 294     pizza->m_border_style = int(windowStyle & BORDER_STYLES);
 295     gtk_fixed_set_has_window(GTK_FIXED(widget), true);
 296     gtk_widget_add_events(widget,
 297         GDK_EXPOSURE_MASK |
 298         GDK_SCROLL_MASK |
 299         GDK_POINTER_MOTION_MASK |
 300         GDK_POINTER_MOTION_HINT_MASK |
 301         GDK_BUTTON_MOTION_MASK |
 302         GDK_BUTTON1_MOTION_MASK |
 303         GDK_BUTTON2_MOTION_MASK |
 304         GDK_BUTTON3_MOTION_MASK |
 305         GDK_BUTTON_PRESS_MASK |
 306         GDK_BUTTON_RELEASE_MASK |
 307         GDK_KEY_PRESS_MASK |
 308         GDK_KEY_RELEASE_MASK |
 309         GDK_ENTER_NOTIFY_MASK |
 310         GDK_LEAVE_NOTIFY_MASK |
 311         GDK_FOCUS_CHANGE_MASK);
 312     return widget;
 313 }
 314
 315 // gtk_fixed_move does not check for a change before issuing a queue_resize,
 316 // we need to avoid that to prevent endless sizing loops, so check first
 317 void wxPizza::move(GtkWidget* widget, int x, int y)
 318 {
 319     GtkFixed* fixed = &m_fixed;
 320     for (const GList* list = fixed->children; list; list = list->next)
 321     {
 322         const GtkFixedChild* child = static_cast<GtkFixedChild*>(list->data);
 323         if (child->widget == widget)
 324         {
 325             if (child->x != x || child->y != y)
 326                 gtk_fixed_move(fixed, widget, x, y);
 327             break;
 328         }
 329     }
 330 }
 331
 332 struct AdjustData {
 333     GdkWindow* window;
 334     int dx, dy;
 335 };
 336
 337 // Adjust allocations for all widgets using the GdkWindow which was just scrolled
 338 extern "C" {
 339 static void scroll_adjust(GtkWidget* widget, void* data)
 340 {
 341     const AdjustData* p = static_cast<AdjustData*>(data);
 342     widget->allocation.x += p->dx;
 343     widget->allocation.y += p->dy;
 344
 345     if (widget->window == p->window)
 346     {
 347         // GtkFrame requires a queue_resize, otherwise parts of
 348         // the frame newly exposed by the scroll are not drawn.
 349         // To be safe, do it for all widgets.
 350         gtk_widget_queue_resize_no_redraw(widget);
 351         if (GTK_IS_CONTAINER(widget))
 352             gtk_container_forall(GTK_CONTAINER(widget), scroll_adjust, data);
 353     }
 354 }
 355 }
 356
 357 void wxPizza::scroll(int dx, int dy)
 358 {
 359     GtkWidget* widget = GTK_WIDGET(this);
 360     if (gtk_widget_get_direction(widget) == GTK_TEXT_DIR_RTL)
 361         dx = -dx;
 362     m_scroll_x -= dx;
 363     m_scroll_y -= dy;
 364     if (widget->window)
 365     {
 366         gdk_window_scroll(widget->window, dx, dy);
 367         // Adjust child allocations. Doing a queue_resize on the children is not
 368         // enough, sometimes they redraw in the wrong place during fast scrolling.
 369         AdjustData data = { widget->window, dx, dy };
 370         gtk_container_forall(GTK_CONTAINER(widget), scroll_adjust, &data);
 371     }
 372 }
 373
 374 void wxPizza::get_border_widths(int& x, int& y)
 375 {
 376     x = y = 0;
 377 #ifndef __WXUNIVERSAL__
 378     if (m_border_style & wxBORDER_SIMPLE)
 379         x = y = 1;
 380     else if (m_border_style)
 381     {
 382         GtkWidget *entry_widget = wxGTKPrivate::GetEntryWidget();
 383         if (entry_widget->style)
 384         {
 385             x = entry_widget->style->xthickness;
 386             y = entry_widget->style->ythickness;
 387         }
 388     }
 389 #endif
 390 }