src/frameworkelement.cpp

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
   2 /*
   3  * frameworkelement.cpp:
   4  *
   5  * Copyright 2007 Novell, Inc. (http://www.novell.com)
   6  *
   7  * See the LICENSE file included with the distribution for details.
   8  *
   9  */
  10
  11 #include <config.h>
  12
  13 #include <math.h>
  14
  15 #include "debug.h"
  16 #include "geometry.h"
  17 #include "application.h"
  18 #include "deployment.h"
  19 #include "runtime.h"
  20 #include "namescope.h"
  21 #include "frameworkelement.h"
  22 #include "trigger.h"
  23 #include "thickness.h"
  24 #include "collection.h"
  25 #include "style.h"
  26 #include "validators.h"
  27
  28 #define MAX_LAYOUT_PASSES 250
  29
  30 FrameworkElementProvider::FrameworkElementProvider (DependencyObject *obj, PropertyPrecedence precedence) : PropertyValueProvider (obj, precedence)
  31 {
  32         actual_height_value = NULL;
  33         actual_width_value = NULL;
  34         last = Size (-INFINITY, -INFINITY);
  35 }
  36
  37 FrameworkElementProvider::~FrameworkElementProvider ()
  38 {
  39         delete actual_height_value;
  40         delete actual_width_value;
  41 }
  42
  43 void
  44 FrameworkElement::Dispose ()
  45 {
  46         if (default_template != NULL) {
  47                 default_template->SetParent (NULL, NULL);
  48                 default_template = NULL;
  49         }
  50         UIElement::Dispose ();
  51 }
  52
  53 Value *
  54 FrameworkElementProvider::GetPropertyValue (DependencyProperty *property)
  55 {
  56         if (property->GetId () != FrameworkElement::ActualHeightProperty &&
  57             property->GetId () != FrameworkElement::ActualWidthProperty)
  58                 return NULL;
  59
  60         FrameworkElement *element = (FrameworkElement *) obj;
  61
  62         Size actual = element->ComputeActualSize ();
  63
  64         if (last != actual) {
  65                 last = actual;
  66
  67                 if (actual_height_value)
  68                         delete actual_height_value;
  69
  70                 if (actual_width_value)
  71                         delete actual_width_value;
  72
  73                 actual_height_value = new Value (actual.height);
  74                 actual_width_value = new Value (actual.width);
  75         }
  76
  77         if (property->GetId () == FrameworkElement::ActualHeightProperty) {
  78                 return actual_height_value;
  79         } else {
  80                 return actual_width_value;
  81         }
  82 };
  83
  84 FrameworkElement::FrameworkElement ()
  85 {
  86         SetObjectType (Type::FRAMEWORKELEMENT);
  87
  88         default_template = NULL;
  89         default_style_applied = false;
  90         get_default_template_cb = NULL;
  91         measure_cb = NULL;
  92         arrange_cb = NULL;
  93         loaded_cb = NULL;
  94         bounds_with_children = Rect ();
  95         logical_parent = NULL;
  96
  97         providers[PropertyPrecedence_LocalStyle] = new StylePropertyValueProvider (this, PropertyPrecedence_LocalStyle);
  98         providers[PropertyPrecedence_DefaultStyle] = new StylePropertyValueProvider (this, PropertyPrecedence_DefaultStyle);
  99         providers[PropertyPrecedence_DynamicValue] = new FrameworkElementProvider (this, PropertyPrecedence_DynamicValue);
 100 }
 101
 102 FrameworkElement::~FrameworkElement ()
 103 {
 104 }
 105
 106 void
 107 FrameworkElement::RenderLayoutClip (cairo_t *cr)
 108 {
 109         FrameworkElement *element = this;
 110         cairo_matrix_t xform;
 111
 112         /* store off the current transform since the following loop is about the blow it away */
 113         cairo_get_matrix (cr, &xform);
 114
 115         while (element) {
 116                 Geometry *geom = LayoutInformation::GetLayoutClip (element);
 117
 118                 if (geom) {
 119                         geom->Draw (cr);
 120                         cairo_clip (cr);
 121                 }
 122
 123                 // translate by the negative visual offset of the
 124                 // element to get the parent's coordinate space.
 125                 Point *visual_offset = LayoutInformation::GetVisualOffset (element);
 126                 if (visual_offset)
 127                         cairo_translate (cr, -visual_offset->x, -visual_offset->y);
 128
 129                 element = (FrameworkElement*)element->GetVisualParent ();
 130         }
 131
 132         /* restore the transform after we're done clipping */
 133         cairo_set_matrix (cr, &xform);
 134 }
 135
 136 Point
 137 FrameworkElement::GetTransformOrigin ()
 138 {
 139         Point *user_xform_origin = GetRenderTransformOrigin ();
 140
 141         double width = GetActualWidth ();
 142         double height = GetActualHeight ();
 143
 144         return Point (width * user_xform_origin->x,
 145                       height * user_xform_origin->y);
 146 }
 147
 148 void
 149 FrameworkElement::SetLogicalParent (DependencyObject *logical_parent, MoonError *error)
 150 {
 151         if (logical_parent && this->logical_parent && this->logical_parent != logical_parent) {
 152                 MoonError::FillIn (error, MoonError::INVALID_OPERATION, "Element is a child of another element");
 153                 return;
 154         }
 155
 156         this->logical_parent = logical_parent;
 157 }
 158
 159 void
 160 FrameworkElement::OnPropertyChanged (PropertyChangedEventArgs *args, MoonError *error)
 161 {
 162         if (args->GetProperty ()->GetOwnerType() != Type::FRAMEWORKELEMENT) {
 163                 UIElement::OnPropertyChanged (args, error);
 164                 return;
 165         }
 166
 167         if (args->GetId () == FrameworkElement::WidthProperty ||
 168             args->GetId () == FrameworkElement::MaxWidthProperty ||
 169             args->GetId () == FrameworkElement::MinWidthProperty ||
 170             args->GetId () == FrameworkElement::MaxHeightProperty ||
 171             args->GetId () == FrameworkElement::MinHeightProperty ||
 172             args->GetId () == FrameworkElement::HeightProperty ||
 173             args->GetId () == FrameworkElement::MarginProperty) {
 174
 175                 Point *p = GetRenderTransformOrigin ();
 176
 177                 /* normally we'd only update the bounds of this
 178                    element on a width/height change, but if the render
 179                    transform is someplace other than (0,0), the
 180                    transform needs to be updated as well. */
 181                 FullInvalidate (p->x != 0.0 || p->y != 0.0);
 182
 183                 FrameworkElement *visual_parent = (FrameworkElement *)GetVisualParent ();
 184                 if (visual_parent) {
 185                         visual_parent->InvalidateMeasure ();
 186                 }
 187
 188                 InvalidateMeasure ();
 189                 InvalidateArrange ();
 190                 UpdateBounds ();
 191         }
 192         else if (args->GetId () == FrameworkElement::StyleProperty) {
 193                 if (args->GetNewValue()) {
 194                         Style *s = args->GetNewValue()->AsStyle ();
 195                         if (s) {
 196                                 // this has a side effect of calling
 197                                 // ProviderValueChanged on all values
 198                                 // in the style, so we might end up
 199                                 // with lots of property notifications
 200                                 // here (reentrancy ok?)
 201
 202                                 Application::GetCurrent()->ApplyStyle (this, s);
 203
 204                                 ((StylePropertyValueProvider*)providers[PropertyPrecedence_LocalStyle])->SealStyle (s);
 205                         }
 206                 }
 207         }
 208         else if (args->GetId () == FrameworkElement::HorizontalAlignmentProperty ||
 209                  args->GetId () == FrameworkElement::VerticalAlignmentProperty) {
 210                 InvalidateArrange ();
 211                 FullInvalidate (true);
 212         }
 213
 214         NotifyListenersOfPropertyChange (args, error);
 215 }
 216
 217 Size
 218 FrameworkElement::ApplySizeConstraints (const Size &size)
 219 {
 220         Size specified (GetWidth (), GetHeight ());
 221         Size constrained (GetMinWidth (), GetMinHeight ());
 222
 223         constrained = constrained.Max (size);
 224
 225         if (!isnan (specified.width))
 226                 constrained.width = specified.width;
 227
 228         if (!isnan (specified.height))
 229                 constrained.height = specified.height;
 230
 231         constrained = constrained.Min (GetMaxWidth (), GetMaxHeight ());
 232         constrained = constrained.Max (GetMinWidth (), GetMinHeight ());
 233
 234         if (GetUseLayoutRounding ()) {
 235                 constrained.width = round (constrained.width);
 236                 constrained.height = round (constrained.height);
 237         }
 238         return constrained;
 239 }
 240
 241 void
 242 FrameworkElement::ComputeBounds ()
 243 {
 244         Size size (GetActualWidth (), GetActualHeight ());
 245         size = ApplySizeConstraints (size);
 246
 247         extents = Rect (0, 0, size.width, size.height);
 248
 249         bounds = IntersectBoundsWithClipPath (extents, false).Transform (&absolute_xform);
 250         bounds_with_children = bounds;
 251
 252         VisualTreeWalker walker = VisualTreeWalker (this);
 253         while (UIElement *item = walker.Step ()) {
 254                 if (!item->GetRenderVisible ())
 255                         continue;
 256
 257                 bounds_with_children = bounds_with_children.Union (item->GetSubtreeBounds ());
 258         }
 259 }
 260
 261 Rect
 262 FrameworkElement::GetSubtreeBounds ()
 263 {
 264         VisualTreeWalker walker = VisualTreeWalker (this);
 265         if (GetSubtreeObject () != NULL)
 266                 return bounds_with_children;
 267
 268         return bounds;
 269 }
 270
 271 Size
 272 FrameworkElement::ComputeActualSize ()
 273 {
 274         UIElement *parent = GetVisualParent ();
 275
 276         if (GetVisibility () != VisibilityVisible)
 277                 return Size (0.0, 0.0);
 278
 279         if ((parent && !parent->Is (Type::CANVAS)) || (IsLayoutContainer ()))
 280                 return GetRenderSize ();
 281
 282         Size actual (0, 0);
 283
 284         actual = ApplySizeConstraints (actual);
 285
 286         return actual;
 287 }
 288
 289 bool
 290 FrameworkElement::InsideLayoutClip (double x, double y)
 291 {
 292         Geometry *layout_clip = LayoutInformation::GetClip (this);
 293         bool inside = true;
 294
 295         if (!layout_clip)
 296                 return inside;
 297
 298         TransformPoint (&x, &y);
 299         inside = layout_clip->GetBounds ().PointInside (x, y);
 300         layout_clip->unref ();
 301
 302         return inside;
 303 }
 304
 305 bool
 306 FrameworkElement::InsideObject (cairo_t *cr, double x, double y)
 307 {
 308         Size framework (GetActualWidth (), GetActualHeight ());
 309         double nx = x, ny = y;
 310
 311         TransformPoint (&nx, &ny);
 312         if (nx < 0 || ny < 0 || nx > framework.width || ny > framework.height)
 313                 return false;
 314
 315         if (!InsideLayoutClip (x, y))
 316                 return false;
 317
 318         return UIElement::InsideObject (cr, x, y);
 319 }
 320
 321 void
 322 FrameworkElement::HitTest (cairo_t *cr, Point p, List *uielement_list)
 323 {
 324         if (!GetRenderVisible ())
 325                 return;
 326
 327         if (!GetHitTestVisible ())
 328                 return;
 329
 330         // first a quick bounds check
 331         if (!GetSubtreeBounds().PointInside (p.x, p.y))
 332                 return;
 333
 334         /* the clip property is global so we can short out here */
 335         if (!InsideClip (cr, p.x, p.y))
 336                 return;
 337
 338         /* create our node and stick it on front */
 339         List::Node *us = uielement_list->Prepend (new UIElementNode (this));
 340         bool hit = false;
 341
 342         VisualTreeWalker walker = VisualTreeWalker (this, ZReverse);
 343         while (UIElement *child = walker.Step ()) {
 344                 child->HitTest (cr, p, uielement_list);
 345
 346                 if (us != uielement_list->First ()) {
 347                         hit = true;
 348                         break;
 349                 }
 350         }
 351
 352         if (!hit && !InsideObject (cr, p.x, p.y))
 353                 uielement_list->Remove (us);
 354 }
 355
 356 void
 357 FrameworkElement::FindElementsInHostCoordinates (cairo_t *cr, Point host, List *uielement_list)
 358 {
 359         if (GetVisibility () != VisibilityVisible)
 360                 return;
 361
 362         if (!GetHitTestVisible ())
 363                 return;
 364
 365         if (bounds_with_children.height <= 0)
 366                 return;
 367
 368         /* the clip property is global so we can short out here */
 369         if (!InsideClip (cr, host.x, host.y))
 370                 return;
 371
 372         cairo_save (cr);
 373
 374         /* create our node and stick it on front */
 375         List::Node *us = uielement_list->Prepend (new UIElementNode (this));
 376
 377         VisualTreeWalker walker = VisualTreeWalker (this, ZForward);
 378         while (UIElement *child = walker.Step ())
 379                 child->FindElementsInHostCoordinates (cr, host, uielement_list);
 380
 381         if (us == uielement_list->First ()) {
 382                 cairo_new_path (cr);
 383                 cairo_identity_matrix (cr);
 384
 385                 if (!CanFindElement () || !InsideObject (cr, host.x, host.y))
 386                         uielement_list->Remove (us);
 387         }
 388         cairo_restore (cr);
 389 }
 390
 391 // FIXME: This is not the fastest way of implementing this, decomposing the rectangle into
 392 // a series of points is probably going to be quite slow. It's a good first effort.
 393 void
 394 FrameworkElement::FindElementsInHostCoordinates (cairo_t *cr, Rect r, List *uielement_list)
 395 {
 396         bool res = false;
 397         if (GetVisibility () != VisibilityVisible)
 398                 return;
 399
 400         if (!GetHitTestVisible ())
 401                 return;
 402
 403         if (bounds_with_children.height <= 0)
 404                 return;
 405
 406         if (!bounds_with_children.IntersectsWith (r))
 407                 return;
 408
 409         cairo_save (cr);
 410         cairo_new_path (cr);
 411
 412         Geometry *clip = GetClip ();
 413         if (clip) {
 414                 if (!r.IntersectsWith (clip->GetBounds ().Transform (&absolute_xform)))
 415                         return;
 416                 r = r.Intersection (clip->GetBounds ().Transform (&absolute_xform));
 417         }
 418
 419         /* create our node and stick it on front */
 420         List::Node *us = uielement_list->Prepend (new UIElementNode (this));
 421
 422         VisualTreeWalker walker = VisualTreeWalker (this, ZForward);
 423         while (UIElement *child = walker.Step ())
 424                 child->FindElementsInHostCoordinates (cr, r, uielement_list);
 425
 426         if (us == uielement_list->First ()) {
 427                 cairo_new_path (cr);
 428                 cairo_identity_matrix (cr);
 429
 430                 res = false;
 431                 if (CanFindElement ()) {
 432                         res = bounds.Intersection (r) == bounds;
 433
 434                         for (int i= r.x; i < (r.x + r.width) && !res; i++)
 435                                 for (int j= r.y; j < (r.y + r.height) && !res; j++)
 436                                         res = InsideObject (cr, i, j);
 437                 }
 438
 439                 if (!res)
 440                         uielement_list->Remove (us);
 441         }
 442         cairo_restore (cr);
 443 }
 444
 445 void
 446 FrameworkElement::GetSizeForBrush (cairo_t *cr, double *width, double *height)
 447 {
 448         *width = GetActualWidth ();
 449         *height = GetActualHeight ();
 450 }
 451
 452 void
 453 FrameworkElement::Measure (Size availableSize)
 454 {
 455         //LOG_LAYOUT ("measuring %p %s %g,%g\n", this, GetTypeName (), availableSize.width, availableSize.height);
 456
 457         Size *last = LayoutInformation::GetPreviousConstraint (this);
 458         bool domeasure = (this->dirty_flags & DirtyMeasure) > 0;
 459
 460         domeasure |= !last || last->width != availableSize.width || last->height != availableSize.height;
 461
 462         if (GetVisibility () != VisibilityVisible) {
 463                 LayoutInformation::SetPreviousConstraint (this, &availableSize);
 464                 SetDesiredSize (Size (0,0));
 465                 return;
 466         }
 467
 468         ApplyTemplate ();
 469
 470         UIElement *parent = GetVisualParent ();
 471         /* unit tests show a short circuit in this case */
 472         /*
 473         if (!parent && !IsContainer () && (!GetSurface () || (GetSurface () && !GetSurface ()->IsTopLevel (this)))) {
 474                 SetDesiredSize (Size (0,0));
 475                 return;
 476         }
 477         */
 478
 479         if (!domeasure)
 480                 return;
 481
 482         LayoutInformation::SetPreviousConstraint (this, &availableSize);
 483
 484         InvalidateArrange ();
 485         UpdateBounds ();
 486
 487         dirty_flags &= ~DirtyMeasure;
 488
 489         Thickness margin = *GetMargin ();
 490         Size size = availableSize.GrowBy (-margin);
 491
 492         size = ApplySizeConstraints (size);
 493
 494         if (measure_cb)
 495                 size = (*measure_cb)(size);
 496         else
 497                 size = MeasureOverride (size);
 498
 499         hidden_desire = size;
 500
 501         if (!parent || parent->Is (Type::CANVAS)) {
 502                 if (Is (Type::CANVAS) || !IsLayoutContainer ()) {
 503                         SetDesiredSize (Size (0,0));
 504                         return;
 505                 }
 506         }
 507
 508         // postcondition the results
 509         size = ApplySizeConstraints (size);
 510
 511         size = size.GrowBy (margin);
 512         size = size.Min (availableSize);
 513
 514         if (GetUseLayoutRounding ()) {
 515                 size.width = round (size.width);
 516                 size.height = round (size.height);
 517         }
 518
 519         SetDesiredSize (size);
 520 }
 521
 522 Size
 523 FrameworkElement::MeasureOverride (Size availableSize)
 524 {
 525         Size desired = Size (0,0);
 526
 527         availableSize = availableSize.Max (desired);
 528
 529         VisualTreeWalker walker = VisualTreeWalker (this);
 530         while (UIElement *child = walker.Step ()) {
 531                 child->Measure (availableSize);
 532                 desired = child->GetDesiredSize ();
 533         }
 534
 535         return desired.Min (availableSize);
 536 }
 537
 538
 539 // not sure about the disconnect between these two methods..  I would
 540 // imagine both should take Rects and ArrangeOverride would return a
 541 // rectangle as well..
 542 void
 543 FrameworkElement::Arrange (Rect finalRect)
 544 {
 545         //LOG_LAYOUT ("arranging %p %s %g,%g,%g,%g\n", this, GetTypeName (), finalRect.x, finalRect.y, finalRect.width, finalRect.height);
 546         Rect *slot = LayoutInformation::GetLayoutSlot (this);
 547         bool doarrange = this->dirty_flags & DirtyArrange;
 548
 549         if (GetUseLayoutRounding ()) {
 550                 Rect rounded;
 551                 rounded.x = round (finalRect.x);
 552                 rounded.y = round (finalRect.y);
 553                 //rounded.width = MAX (round ((finalRect.x + finalRect.width) - rounded.x), 0);
 554                 //rounded.height = MAX (round ((finalRect.y + finalRect.height) - rounded.y), 0);
 555                 rounded.width = round (finalRect.width);
 556                 rounded.height = round (finalRect.height);
 557                 finalRect = rounded;
 558         }
 559
 560         doarrange |= slot ? *slot != finalRect : true;
 561
 562         if (finalRect.width < 0 || finalRect.height < 0
 563             || isinf (finalRect.width) || isinf (finalRect.height)
 564             || isnan (finalRect.width) || isnan (finalRect.height)) {
 565                 Size desired = GetDesiredSize ();
 566                 g_warning ("invalid arguments to Arrange (%g,%g,%g,%g) Desired = (%g,%g)", finalRect.x, finalRect.y, finalRect.width, finalRect.height, desired.width, desired.height);
 567                 return;
 568         }
 569
 570         UIElement *parent = GetVisualParent ();
 571         /* unit tests show a short circuit in this case */
 572         /*
 573         if (!parent && !IsContainer () && (!GetSurface () || (GetSurface () && !GetSurface ()->IsTopLevel (this)))) {
 574                 return;
 575         }
 576         */
 577         if (GetVisibility () != VisibilityVisible) {
 578                 LayoutInformation::SetLayoutSlot (this, &finalRect);
 579                 return;
 580         }
 581
 582         if (!doarrange)
 583                 return;
 584
 585         /*
 586          * FIXME I'm not happy with doing this here but until I come
 587          * up with a better plan make sure that layout elements have
 588          * been measured at least once
 589          */
 590         Size *measure = LayoutInformation::GetPreviousConstraint (this);
 591         if (IsContainer () && !measure)
 592                 Measure (Size (finalRect.width, finalRect.height));
 593         measure = LayoutInformation::GetPreviousConstraint (this);
 594
 595         ClearValue (LayoutInformation::LayoutClipProperty);
 596
 597         this->dirty_flags &= ~DirtyArrange;
 598
 599         Thickness margin = *GetMargin ();
 600         Rect child_rect = finalRect.GrowBy (-margin);
 601
 602         cairo_matrix_init_translate (&layout_xform, child_rect.x, child_rect.y);
 603         UpdateTransform ();
 604         UpdateBounds ();
 605         this->dirty_flags &= ~DirtyArrange;
 606
 607         Size offer = hidden_desire;
 608         Size response;
 609
 610         Size stretched = ApplySizeConstraints (Size (child_rect.width, child_rect.height));
 611         Size framework = ApplySizeConstraints (Size ());
 612
 613         HorizontalAlignment horiz = GetHorizontalAlignment ();
 614         VerticalAlignment vert = GetVerticalAlignment ();
 615
 616         if (horiz == HorizontalAlignmentStretch)
 617                 framework.width = MAX (framework.width, stretched.width);
 618
 619         if (vert == VerticalAlignmentStretch)
 620                 framework.height = MAX (framework.height, stretched.height);
 621
 622         offer = offer.Max (framework);
 623
 624         LayoutInformation::SetLayoutSlot (this, &finalRect);
 625
 626         if (arrange_cb)
 627                 response = (*arrange_cb)(offer);
 628         else
 629                 response = ArrangeOverride (offer);
 630
 631         Point visual_offset (child_rect.x, child_rect.y);
 632         LayoutInformation::SetVisualOffset (this, &visual_offset);
 633
 634         Size old_size = GetRenderSize ();
 635
 636         if (GetUseLayoutRounding ()) {
 637                 response.width = round (response.width);
 638                 response.height = round (response.height);
 639         }
 640
 641         SetRenderSize (response);
 642
 643         if (!parent || parent->Is (Type::CANVAS)) {
 644                 if (!IsLayoutContainer ()) {
 645                         SetRenderSize (Size (0,0));
 646                         return;
 647                 }
 648         }
 649
 650         Size constrainedResponse = response.Min (ApplySizeConstraints (response));
 651
 652         /* it doesn't appear we apply aligment or layout clipping to toplevel elements */
 653         bool toplevel = IsAttached () && GetDeployment ()->GetSurface ()->IsTopLevel (this);
 654
 655         if (!toplevel) {
 656                 switch (horiz) {
 657                 case HorizontalAlignmentLeft:
 658                         break;
 659                 case HorizontalAlignmentRight:
 660                         visual_offset.x += child_rect.width - constrainedResponse.width;
 661                         break;
 662                 case HorizontalAlignmentCenter:
 663                         visual_offset.x += (child_rect.width - constrainedResponse.width) * .5;
 664                         break;
 665                 default:
 666                         visual_offset.x += MAX ((child_rect.width  - constrainedResponse.width) * .5, 0);
 667                         break;
 668                 }
 669
 670                 switch (vert) {
 671                 case VerticalAlignmentTop:
 672                         break;
 673                 case VerticalAlignmentBottom:
 674                         visual_offset.y += child_rect.height - constrainedResponse.height;
 675                         break;
 676                 case VerticalAlignmentCenter:
 677                         visual_offset.y += (child_rect.height - constrainedResponse.height) * .5;
 678                         break;
 679                 default:
 680                         visual_offset.y += MAX ((child_rect.height - constrainedResponse.height) * .5, 0);
 681
 682                         break;
 683                 }
 684         }
 685
 686         cairo_matrix_init_translate (&layout_xform, visual_offset.x, visual_offset.y);
 687         LayoutInformation::SetVisualOffset (this, &visual_offset);
 688
 689         Rect element (0, 0, response.width, response.height);
 690         Rect layout_clip = child_rect;
 691         layout_clip.x = MAX (child_rect.x - visual_offset.x, 0);
 692         layout_clip.y = MAX (child_rect.y - visual_offset.y, 0);
 693         if (GetUseLayoutRounding ()) {
 694                 layout_clip.x = round (layout_clip.x);
 695                 layout_clip.y = round (layout_clip.y);
 696         }
 697
 698         if (((!toplevel && element != element.Intersection (layout_clip)) || constrainedResponse != response) && !Is (Type::CANVAS) && ((parent && !parent->Is (Type::CANVAS)) || IsContainer ())) {
 699                 Size framework_clip = ApplySizeConstraints (Size (INFINITY, INFINITY));
 700                 layout_clip = layout_clip.Intersection (Rect (0, 0, framework_clip.width, framework_clip.height));
 701                 RectangleGeometry *rectangle = new RectangleGeometry ();
 702                 rectangle->SetRect (&layout_clip);
 703                 LayoutInformation::SetLayoutClip (this, rectangle);
 704                 rectangle->unref ();
 705         }
 706
 707         if (old_size != response) { // || (old_offset && *old_offset != visual_offset)) {
 708                 if (!LayoutInformation::GetLastRenderSize (this)) {
 709                         LayoutInformation::SetLastRenderSize (this, &old_size);
 710                         PropagateFlagUp (DIRTY_SIZE_HINT);
 711                 }
 712         }
 713 }
 714
 715 Size
 716 FrameworkElement::ArrangeOverride (Size finalSize)
 717 {
 718         Size arranged = finalSize;
 719
 720         VisualTreeWalker walker = VisualTreeWalker (this);
 721         while (UIElement *child = walker.Step ()) {
 722                 Rect childRect (0,0,finalSize.width,finalSize.height);
 723
 724                 child->Arrange (childRect);
 725                 arranged = arranged.Max (finalSize);
 726         }
 727
 728         return arranged;
 729 }
 730
 731 void
 732 FrameworkElement::UpdateLayout ()
 733 {
 734         UIElement *element = this;
 735         UIElement *parent = NULL;
 736
 737         // Seek to the top
 738         while ((parent = element->GetVisualParent ())) {
 739                 element = parent;
 740         }
 741
 742         LOG_LAYOUT ("\nFrameworkElement::UpdateLayout: ");
 743         List *measure_list = new List ();
 744         List *arrange_list = new List ();
 745         List *size_list = new List ();
 746         bool updated = false;
 747         int i = 0;
 748         while (i < MAX_LAYOUT_PASSES) {
 749                 LOG_LAYOUT ("\u267c");
 750
 751                 // If we abort the arrange phase because InvalidateMeasure was called or if
 752                 // we abort the size phase because InvalidateMeasure/InvalidateArrange
 753                 // was called, we need to put the hint flags back otherwise we'll skip that
 754                 // branch during the next pass.
 755                 while (UIElementNode *node = (UIElementNode *)arrange_list->First ()) {
 756                         node->uielement->PropagateFlagUp (DIRTY_ARRANGE_HINT);
 757                         arrange_list->Remove (node);
 758                 }
 759                 while (UIElementNode *node = (UIElementNode *)size_list->First ()) {
 760                         node->uielement->PropagateFlagUp (DIRTY_SIZE_HINT);
 761                         size_list->Remove (node);
 762                 }
 763
 764                 i++;
 765                 // Figure out which type of elements we should be selected - dirty measure, arrange or size
 766                 UIElementFlags flag = NONE;
 767                 if (element->HasFlag (DIRTY_MEASURE_HINT))
 768                         flag = DIRTY_MEASURE_HINT;
 769                 else if (element->HasFlag (DIRTY_ARRANGE_HINT))
 770                         flag = DIRTY_ARRANGE_HINT;
 771                 else if (element->HasFlag (DIRTY_SIZE_HINT))
 772                         flag = DIRTY_SIZE_HINT;
 773
 774                 if (flag != NONE) {
 775                         DeepTreeWalker measure_walker (element);
 776                         while (FrameworkElement *child = (FrameworkElement *)measure_walker.Step ()) {
 777                                 if (child->GetVisibility () != VisibilityVisible || !child->HasFlag (flag)) {
 778                                         measure_walker.SkipBranch ();
 779                                         continue;
 780                                 }
 781
 782                                 child->ClearFlag (flag);
 783                                 switch (flag) {
 784                                         case DIRTY_MEASURE_HINT:
 785                                                 if (child->dirty_flags & DirtyMeasure)
 786                                                         measure_list->Append (new UIElementNode (child));
 787                                         break;
 788                                         case DIRTY_ARRANGE_HINT:
 789                                                 if (child->dirty_flags & DirtyArrange)
 790                                                         arrange_list->Append (new UIElementNode (child));
 791                                         break;
 792                                         case DIRTY_SIZE_HINT:
 793                                                 if (child->ReadLocalValue (LayoutInformation::LastRenderSizeProperty))
 794                                                         size_list->Append (new UIElementNode (child));
 795                                         break;
 796                                         default:
 797                                         break;
 798                                 }
 799                         }
 800                 }
 801
 802                 if (flag == DIRTY_MEASURE_HINT) {
 803                         while (UIElementNode* node = (UIElementNode*)measure_list->First ()) {
 804                                 measure_list->Unlink (node);
 805
 806                                 node->uielement->DoMeasure ();
 807
 808                                 updated = true;
 809                                 delete (node);
 810                         }
 811                 } else if (flag == DIRTY_ARRANGE_HINT) {
 812                         while (UIElementNode *node = (UIElementNode*)arrange_list->First ()) {
 813                                 arrange_list->Unlink (node);
 814
 815                                 node->uielement->DoArrange ();
 816
 817                                 updated = true;
 818                                 delete (node);
 819                                 if (element->HasFlag (DIRTY_MEASURE_HINT))
 820                                         break;
 821                         }
 822                 } else if (flag == DIRTY_SIZE_HINT) {
 823                         while (UIElementNode *node = (UIElementNode*)size_list->First ()) {
 824                                 if (element->HasFlag (DIRTY_MEASURE_HINT) ||
 825                                         element->HasFlag (DIRTY_ARRANGE_HINT)) {
 826                                         break;
 827                                 }
 828
 829                                 size_list->Unlink (node);
 830                                 FrameworkElement *fe = (FrameworkElement*) node->uielement;
 831
 832                                 updated = true;
 833                                 Size *last = LayoutInformation::GetLastRenderSize (fe);
 834                                 if (last) {
 835                                         SizeChangedEventArgs *args = new SizeChangedEventArgs (*last, fe->GetRenderSize ());
 836                                         fe->ClearValue (LayoutInformation::LastRenderSizeProperty, false);
 837                                         fe->Emit (FrameworkElement::SizeChangedEvent, args);
 838                                 }
 839                                 delete (node);
 840                         }
 841                 } else {
 842                         if (updated)
 843                                 GetDeployment ()->LayoutUpdated ();
 844
 845                         // If emitting LayoutUpdate invalidated measures/arranges, we should loop again
 846                         if (element->HasFlag (DIRTY_MEASURE_HINT) || element->HasFlag (DIRTY_ARRANGE_HINT))
 847                                 updated = false;
 848                         else
 849                                 break;
 850                 }
 851         }
 852
 853         delete measure_list;
 854         delete arrange_list;
 855         delete size_list;
 856
 857         if (i >= MAX_LAYOUT_PASSES)  {
 858                 // FIXME we shouldn't have to do this updated call here but otherwise we'll miss it completely
 859                 if (updated)
 860                         GetDeployment ()->LayoutUpdated ();
 861                 g_warning ("\n************** UpdateLayout Bailing Out after %d Passes *******************\n", i);
 862         } else {
 863                 LOG_LAYOUT (" (%d)\n", i);
 864
 865 #if SANITY
 866                 DeepTreeWalker verifier (element);
 867                 while (UIElement *e = verifier.Step ()) {
 868                         if (e->GetVisibility () != VisibilityVisible) {
 869                                 verifier.SkipBranch ();
 870                                 continue;
 871                         }
 872                         if (e->dirty_flags & DirtyMeasure)
 873                                 g_warning ("%s still has dirty measure after the layout pass\n", e->GetType ()->GetName());
 874                         if (e->dirty_flags & DirtyArrange)
 875                                 g_warning ("%s still has dirty arrange after the layout pass\n", e->GetType ()->GetName());
 876                         if (e->ReadLocalValue (LayoutInformation::LastRenderSizeProperty))
 877                                 g_warning ("%s still has LastRenderSize after the layout pass\n", e->GetType ()->GetName());
 878                 }
 879 #endif
 880         }
 881 }
 882
 883 void
 884 FrameworkElement::RegisterManagedOverrides (MeasureOverrideCallback measure_cb, ArrangeOverrideCallback arrange_cb,
 885                                             GetDefaultTemplateCallback get_default_template_cb, LoadedCallback loaded_cb)
 886 {
 887         this->measure_cb = measure_cb;
 888         this->arrange_cb = arrange_cb;
 889         this->get_default_template_cb = get_default_template_cb;
 890         this->loaded_cb = loaded_cb;
 891 }
 892
 893 void
 894 FrameworkElement::SetDefaultStyle (Style *style)
 895 {
 896         if (style) {
 897                 Application::GetCurrent()->ApplyStyle (this, style);
 898                 default_style_applied = true;
 899                 ((StylePropertyValueProvider*)providers[PropertyPrecedence_DefaultStyle])->SealStyle (style);
 900         }
 901 }
 902
 903
 904 void
 905 FrameworkElement::OnLoaded ()
 906 {
 907         UIElement::OnLoaded ();
 908
 909         if (loaded_cb)
 910                 (*loaded_cb) (this);
 911 }
 912
 913 bool
 914 FrameworkElement::ApplyTemplate ()
 915 {
 916         if (GetSubtreeObject ())
 917                 return false;
 918
 919         bool result = DoApplyTemplate ();
 920         if (result)
 921                 OnApplyTemplate ();
 922         return result;
 923 }
 924
 925 bool
 926 FrameworkElement::DoApplyTemplate ()
 927 {
 928         UIElement *e = GetDefaultTemplate ();
 929         if (e) {
 930                 MoonError err;
 931                 e->SetParent (this, &err);
 932                 if (default_template)
 933                         default_template->SetParent (NULL, NULL);
 934                 default_template = e;
 935                 SetSubtreeObject (e);
 936                 ElementAdded (e);
 937         }
 938         return e != NULL;
 939 }
 940
 941 void
 942 FrameworkElement::OnApplyTemplate ()
 943 {
 944         Emit (TemplateAppliedEvent);
 945 }
 946
 947 void
 948 FrameworkElement::ElementRemoved (UIElement *obj)
 949 {
 950         if (GetSubtreeObject () == obj) {
 951                 MoonError e;
 952                 obj->SetParent (NULL, &e);
 953                 SetSubtreeObject (NULL);
 954         }
 955         UIElement::ElementRemoved (obj);
 956 }
 957
 958 UIElement *
 959 FrameworkElement::GetDefaultTemplate ()
 960 {
 961         if (get_default_template_cb)
 962                 return get_default_template_cb (this);
 963         return NULL;
 964 }