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