xref: /haiku/src/kits/interface/Box.cpp (revision 4a55cc230cf7566cadcbb23b1928eefff8aea9a2) 
1 /*
2  * Copyright 2001-2022 Haiku, Inc. All Rights Reserved.
3  * Distributed under the terms of the MIT license.
4  *
5  * Authors:
6  *		Stephan Aßmus, superstippi@gmx.de
7  *		DarkWyrm, bpmagic@columbus.rr.com
8  *		Axel Dörfler, axeld@pinc-software.de
9  *		Marc Flerackers, mflerackers@androme.be
10  *		John Scipione, jscipione@gmail.com
11  */
12 
13 
14 #include <Box.h>
15 
16 #include <stdio.h>
17 #include <stdlib.h>
18 #include <string.h>
19 
20 #include <ControlLook.h>
21 #include <Layout.h>
22 #include <LayoutUtils.h>
23 #include <Message.h>
24 #include <Region.h>
25 
26 #include <binary_compatibility/Interface.h>
27 
28 
29 struct BBox::LayoutData {
30 	LayoutData()
31 		: valid(false)
32 	{
33 	}
34 
35 	BRect	label_box;		// label box (label string or label view); in case
36 							// of a label string not including descent
37 	BRect	insets;			// insets induced by border and label
38 	BSize	min;
39 	BSize	max;
40 	BSize	preferred;
41 	BAlignment alignment;
42 	bool	valid;			// validity the other fields
43 };
44 
45 
46 BBox::BBox(BRect frame, const char* name, uint32 resizingMode, uint32 flags,
47 		border_style border)
48 	:
49 	BView(frame, name, resizingMode, flags  | B_WILL_DRAW | B_FRAME_EVENTS),
50 	  fStyle(border)
51 {
52 	_InitObject();
53 }
54 
55 
56 BBox::BBox(const char* name, uint32 flags, border_style border, BView* child)
57 	:
58 	BView(name, flags | B_WILL_DRAW | B_FRAME_EVENTS),
59 	fStyle(border)
60 {
61 	_InitObject();
62 
63 	if (child)
64 		AddChild(child);
65 }
66 
67 
68 BBox::BBox(border_style border, BView* child)
69 	:
70 	BView(NULL, B_WILL_DRAW | B_FRAME_EVENTS | B_NAVIGABLE_JUMP),
71 	fStyle(border)
72 {
73 	_InitObject();
74 
75 	if (child)
76 		AddChild(child);
77 }
78 
79 
80 BBox::BBox(BMessage* archive)
81 	:
82 	BView(archive),
83 	fStyle(B_FANCY_BORDER)
84 {
85 	_InitObject(archive);
86 }
87 
88 
89 BBox::~BBox()
90 {
91 	_ClearLabel();
92 
93 	delete fLayoutData;
94 }
95 
96 
97 BArchivable*
98 BBox::Instantiate(BMessage* archive)
99 {
100 	if (validate_instantiation(archive, "BBox"))
101 		return new BBox(archive);
102 
103 	return NULL;
104 }
105 
106 
107 status_t
108 BBox::Archive(BMessage* archive, bool deep) const
109 {
110 	status_t ret = BView::Archive(archive, deep);
111 
112 	if (fLabel && ret == B_OK)
113 		ret = archive->AddString("_label", fLabel);
114 
115 	if (fLabelView && ret == B_OK)
116 		ret = archive->AddBool("_lblview", true);
117 
118 	if (fStyle != B_FANCY_BORDER && ret == B_OK)
119 		ret = archive->AddInt32("_style", fStyle);
120 
121 	return ret;
122 }
123 
124 
125 void
126 BBox::SetBorder(border_style border)
127 {
128 	if (border == fStyle)
129 		return;
130 
131 	fStyle = border;
132 
133 	InvalidateLayout();
134 
135 	if (Window() != NULL && LockLooper()) {
136 		Invalidate();
137 		UnlockLooper();
138 	}
139 }
140 
141 
142 border_style
143 BBox::Border() const
144 {
145 	return fStyle;
146 }
147 
148 
149 //! This function is not part of the R5 API and is not yet finalized yet
150 float
151 BBox::TopBorderOffset()
152 {
153 	_ValidateLayoutData();
154 
155 	if (fLabel != NULL || fLabelView != NULL)
156 		return fLayoutData->label_box.Height() / 2;
157 
158 	return 0;
159 }
160 
161 
162 //! This function is not part of the R5 API and is not yet finalized yet
163 BRect
164 BBox::InnerFrame()
165 {
166 	_ValidateLayoutData();
167 
168 	BRect frame(Bounds());
169 	frame.left += fLayoutData->insets.left;
170 	frame.top += fLayoutData->insets.top;
171 	frame.right -= fLayoutData->insets.right;
172 	frame.bottom -= fLayoutData->insets.bottom;
173 
174 	return frame;
175 }
176 
177 
178 void
179 BBox::SetLabel(const char* string)
180 {
181 	_ClearLabel();
182 
183 	if (string)
184 		fLabel = strdup(string);
185 
186 	InvalidateLayout();
187 
188 	if (Window())
189 		Invalidate();
190 }
191 
192 
193 status_t
194 BBox::SetLabel(BView* viewLabel)
195 {
196 	_ClearLabel();
197 
198 	if (viewLabel) {
199 		fLabelView = viewLabel;
200 		fLabelView->MoveTo(10.0f, 0.0f);
201 		AddChild(fLabelView, ChildAt(0));
202 	}
203 
204 	InvalidateLayout();
205 
206 	if (Window())
207 		Invalidate();
208 
209 	return B_OK;
210 }
211 
212 
213 const char*
214 BBox::Label() const
215 {
216 	return fLabel;
217 }
218 
219 
220 BView*
221 BBox::LabelView() const
222 {
223 	return fLabelView;
224 }
225 
226 
227 void
228 BBox::Draw(BRect updateRect)
229 {
230 	_ValidateLayoutData();
231 
232 	PushState();
233 
234 	BRect labelBox = BRect(0, 0, 0, 0);
235 	if (fLabel != NULL) {
236 		labelBox = fLayoutData->label_box;
237 		BRegion update(updateRect);
238 		update.Exclude(labelBox);
239 
240 		ConstrainClippingRegion(&update);
241 	} else if (fLabelView != NULL)
242 		labelBox = fLabelView->Bounds();
243 
244 	switch (fStyle) {
245 		case B_FANCY_BORDER:
246 			_DrawFancy(labelBox);
247 			break;
248 
249 		case B_PLAIN_BORDER:
250 			_DrawPlain(labelBox);
251 			break;
252 
253 		default:
254 			break;
255 	}
256 
257 	if (fLabel != NULL) {
258 		ConstrainClippingRegion(NULL);
259 
260 		font_height fontHeight;
261 		GetFontHeight(&fontHeight);
262 
263 		// offset label up by 1/6 the font height
264 		float lineHeight = fontHeight.ascent + fontHeight.descent;
265 		float yOffset = roundf(lineHeight / 6.0f);
266 
267 		SetHighColor(ui_color(B_PANEL_TEXT_COLOR));
268 		DrawString(fLabel, BPoint(10.0f, fontHeight.ascent - yOffset));
269 	}
270 
271 	PopState();
272 }
273 
274 
275 void
276 BBox::AttachedToWindow()
277 {
278 	AdoptParentColors();
279 
280 	// Force low color to match view color for proper label drawing.
281 	float viewTint = B_NO_TINT;
282 	float lowTint = B_NO_TINT;
283 
284 	if (LowUIColor(&lowTint) != ViewUIColor(&viewTint) || viewTint != lowTint)
285 		SetLowUIColor(ViewUIColor(), viewTint);
286 	else if (LowColor() != ViewColor())
287 		SetLowColor(ViewColor());
288 
289 	if (ViewColor() == B_TRANSPARENT_COLOR)
290 		AdoptSystemColors();
291 
292 	// The box could have been resized in the mean time
293 	fBounds = Bounds().OffsetToCopy(0, 0);
294 }
295 
296 
297 void
298 BBox::DetachedFromWindow()
299 {
300 	BView::DetachedFromWindow();
301 }
302 
303 
304 void
305 BBox::AllAttached()
306 {
307 	BView::AllAttached();
308 }
309 
310 
311 void
312 BBox::AllDetached()
313 {
314 	BView::AllDetached();
315 }
316 
317 
318 void
319 BBox::FrameResized(float width, float height)
320 {
321 	BRect bounds(Bounds());
322 
323 	// invalidate the regions that the app_server did not
324 	// (for removing the previous or drawing the new border)
325 	if (fStyle != B_NO_BORDER) {
326 		// TODO: this must be made part of the be_control_look stuff!
327 		int32 borderSize = fStyle == B_PLAIN_BORDER ? 0 : 2;
328 
329 		// Horizontal
330 		BRect invalid(bounds);
331 		if (fBounds.Width() < bounds.Width()) {
332 			// enlarging
333 			invalid.left = bounds.left + fBounds.right - borderSize;
334 			invalid.right = bounds.left + fBounds.right;
335 
336 			Invalidate(invalid);
337 		} else if (fBounds.Width() > bounds.Width()) {
338 			// shrinking
339 			invalid.left = bounds.left + bounds.right - borderSize;
340 
341 			Invalidate(invalid);
342 		}
343 
344 		// Vertical
345 		invalid = bounds;
346 		if (fBounds.Height() < bounds.Height()) {
347 			// enlarging
348 			invalid.top = bounds.top + fBounds.bottom - borderSize;
349 			invalid.bottom = bounds.top + fBounds.bottom;
350 
351 			Invalidate(invalid);
352 		} else if (fBounds.Height() > bounds.Height()) {
353 			// shrinking
354 			invalid.top = bounds.top + bounds.bottom - borderSize;
355 
356 			Invalidate(invalid);
357 		}
358 	}
359 
360 	fBounds.right = width;
361 	fBounds.bottom = height;
362 }
363 
364 
365 void
366 BBox::MessageReceived(BMessage* message)
367 {
368 	BView::MessageReceived(message);
369 }
370 
371 
372 void
373 BBox::MouseDown(BPoint point)
374 {
375 	BView::MouseDown(point);
376 }
377 
378 
379 void
380 BBox::MouseUp(BPoint point)
381 {
382 	BView::MouseUp(point);
383 }
384 
385 
386 void
387 BBox::WindowActivated(bool active)
388 {
389 	BView::WindowActivated(active);
390 }
391 
392 
393 void
394 BBox::MouseMoved(BPoint point, uint32 transit, const BMessage* message)
395 {
396 	BView::MouseMoved(point, transit, message);
397 }
398 
399 
400 void
401 BBox::FrameMoved(BPoint newLocation)
402 {
403 	BView::FrameMoved(newLocation);
404 }
405 
406 
407 BHandler*
408 BBox::ResolveSpecifier(BMessage* message, int32 index, BMessage* specifier,
409 	int32 what, const char* property)
410 {
411 	return BView::ResolveSpecifier(message, index, specifier, what, property);
412 }
413 
414 
415 void
416 BBox::ResizeToPreferred()
417 {
418 	float width, height;
419 	GetPreferredSize(&width, &height);
420 
421 	// make sure the box don't get smaller than it already is
422 	if (width < Bounds().Width())
423 		width = Bounds().Width();
424 	if (height < Bounds().Height())
425 		height = Bounds().Height();
426 
427 	BView::ResizeTo(width, height);
428 }
429 
430 
431 void
432 BBox::GetPreferredSize(float* _width, float* _height)
433 {
434 	_ValidateLayoutData();
435 
436 	if (_width)
437 		*_width = fLayoutData->preferred.width;
438 	if (_height)
439 		*_height = fLayoutData->preferred.height;
440 }
441 
442 
443 void
444 BBox::MakeFocus(bool focused)
445 {
446 	BView::MakeFocus(focused);
447 }
448 
449 
450 status_t
451 BBox::GetSupportedSuites(BMessage* message)
452 {
453 	return BView::GetSupportedSuites(message);
454 }
455 
456 
457 status_t
458 BBox::Perform(perform_code code, void* _data)
459 {
460 	switch (code) {
461 		case PERFORM_CODE_MIN_SIZE:
462 			((perform_data_min_size*)_data)->return_value
463 				= BBox::MinSize();
464 			return B_OK;
465 		case PERFORM_CODE_MAX_SIZE:
466 			((perform_data_max_size*)_data)->return_value
467 				= BBox::MaxSize();
468 			return B_OK;
469 		case PERFORM_CODE_PREFERRED_SIZE:
470 			((perform_data_preferred_size*)_data)->return_value
471 				= BBox::PreferredSize();
472 			return B_OK;
473 		case PERFORM_CODE_LAYOUT_ALIGNMENT:
474 			((perform_data_layout_alignment*)_data)->return_value
475 				= BBox::LayoutAlignment();
476 			return B_OK;
477 		case PERFORM_CODE_HAS_HEIGHT_FOR_WIDTH:
478 			((perform_data_has_height_for_width*)_data)->return_value
479 				= BBox::HasHeightForWidth();
480 			return B_OK;
481 		case PERFORM_CODE_GET_HEIGHT_FOR_WIDTH:
482 		{
483 			perform_data_get_height_for_width* data
484 				= (perform_data_get_height_for_width*)_data;
485 			BBox::GetHeightForWidth(data->width, &data->min, &data->max,
486 				&data->preferred);
487 			return B_OK;
488 		}
489 		case PERFORM_CODE_SET_LAYOUT:
490 		{
491 			perform_data_set_layout* data = (perform_data_set_layout*)_data;
492 			BBox::SetLayout(data->layout);
493 			return B_OK;
494 		}
495 		case PERFORM_CODE_LAYOUT_INVALIDATED:
496 		{
497 			perform_data_layout_invalidated* data
498 				= (perform_data_layout_invalidated*)_data;
499 			BBox::LayoutInvalidated(data->descendants);
500 			return B_OK;
501 		}
502 		case PERFORM_CODE_DO_LAYOUT:
503 		{
504 			BBox::DoLayout();
505 			return B_OK;
506 		}
507 	}
508 
509 	return BView::Perform(code, _data);
510 }
511 
512 
513 BSize
514 BBox::MinSize()
515 {
516 	_ValidateLayoutData();
517 
518 	BSize size = (GetLayout() ? GetLayout()->MinSize() : fLayoutData->min);
519 	if (size.width < fLayoutData->min.width)
520 		size.width = fLayoutData->min.width;
521 	return BLayoutUtils::ComposeSize(ExplicitMinSize(), size);
522 }
523 
524 
525 BSize
526 BBox::MaxSize()
527 {
528 	_ValidateLayoutData();
529 
530 	BSize size = (GetLayout() ? GetLayout()->MaxSize() : fLayoutData->max);
531 	return BLayoutUtils::ComposeSize(ExplicitMaxSize(), size);
532 }
533 
534 
535 BSize
536 BBox::PreferredSize()
537 {
538 	_ValidateLayoutData();
539 
540 	BSize size = (GetLayout() ? GetLayout()->PreferredSize()
541 		: fLayoutData->preferred);
542 	return BLayoutUtils::ComposeSize(ExplicitPreferredSize(), size);
543 }
544 
545 
546 BAlignment
547 BBox::LayoutAlignment()
548 {
549 	_ValidateLayoutData();
550 
551 	BAlignment alignment = (GetLayout() ? GetLayout()->Alignment()
552 			: fLayoutData->alignment);
553 	return BLayoutUtils::ComposeAlignment(ExplicitAlignment(), alignment);
554 }
555 
556 
557 void
558 BBox::LayoutInvalidated(bool descendants)
559 {
560 	fLayoutData->valid = false;
561 }
562 
563 
564 void
565 BBox::DoLayout()
566 {
567 	// Bail out, if we shan't do layout.
568 	if (!(Flags() & B_SUPPORTS_LAYOUT))
569 		return;
570 
571 	BLayout* layout = GetLayout();
572 
573 	// If the user set a layout, let the base class version call its
574 	// hook. In case when we have BView as a label, remove it from child list
575 	// so it won't be layouted with the rest of views and add it again
576 	// after that.
577 	if (layout != NULL) {
578 		if (fLabelView)
579 			RemoveChild(fLabelView);
580 
581 		BView::DoLayout();
582 
583 		if (fLabelView != NULL) {
584 			DisableLayoutInvalidation();
585 				// don't trigger a relayout
586 			AddChild(fLabelView, ChildAt(0));
587 			EnableLayoutInvalidation();
588 		}
589 	}
590 
591 	_ValidateLayoutData();
592 
593 	// Even if the user set a layout, restore label view to it's
594 	// desired position.
595 
596 	// layout the label view
597 	if (fLabelView != NULL) {
598 		fLabelView->MoveTo(fLayoutData->label_box.LeftTop());
599 		fLabelView->ResizeTo(fLayoutData->label_box.Size());
600 	}
601 
602 	// If we have layout return here and do not layout the child
603 	if (layout != NULL)
604 		return;
605 
606 	// layout the child
607 	BView* child = _Child();
608 	if (child != NULL) {
609 		BRect frame(Bounds());
610 		frame.left += fLayoutData->insets.left;
611 		frame.top += fLayoutData->insets.top;
612 		frame.right -= fLayoutData->insets.right;
613 		frame.bottom -= fLayoutData->insets.bottom;
614 
615 		if ((child->Flags() & B_SUPPORTS_LAYOUT) != 0)
616 			BLayoutUtils::AlignInFrame(child, frame);
617 		else
618 			child->MoveTo(frame.LeftTop());
619 	}
620 }
621 
622 
623 void BBox::_ReservedBox1() {}
624 void BBox::_ReservedBox2() {}
625 
626 
627 BBox &
628 BBox::operator=(const BBox &)
629 {
630 	return *this;
631 }
632 
633 
634 void
635 BBox::_InitObject(BMessage* archive)
636 {
637 	fBounds = Bounds().OffsetToCopy(0, 0);
638 
639 	fLabel = NULL;
640 	fLabelView = NULL;
641 	fLayoutData = new LayoutData;
642 
643 	int32 flags = 0;
644 
645 	BFont font(be_bold_font);
646 
647 	if (!archive || !archive->HasString("_fname"))
648 		flags = B_FONT_FAMILY_AND_STYLE;
649 
650 	if (!archive || !archive->HasFloat("_fflt"))
651 		flags |= B_FONT_SIZE;
652 
653 	if (flags != 0)
654 		SetFont(&font, flags);
655 
656 	if (archive != NULL) {
657 		const char* string;
658 		if (archive->FindString("_label", &string) == B_OK)
659 			SetLabel(string);
660 
661 		bool fancy;
662 		int32 style;
663 
664 		if (archive->FindBool("_style", &fancy) == B_OK)
665 			fStyle = fancy ? B_FANCY_BORDER : B_PLAIN_BORDER;
666 		else if (archive->FindInt32("_style", &style) == B_OK)
667 			fStyle = (border_style)style;
668 
669 		bool hasLabelView;
670 		if (archive->FindBool("_lblview", &hasLabelView) == B_OK)
671 			fLabelView = ChildAt(0);
672 	}
673 
674 	AdoptSystemColors();
675 }
676 
677 
678 void
679 BBox::_DrawPlain(BRect labelBox)
680 {
681 	BRect rect = Bounds();
682 	rect.top += TopBorderOffset();
683 
684 	float lightTint;
685 	float shadowTint;
686 	lightTint = B_LIGHTEN_1_TINT;
687 	shadowTint = B_DARKEN_1_TINT;
688 
689 	if (rect.Height() == 0.0 || rect.Width() == 0.0) {
690 		// used as separator
691 		rgb_color shadow = tint_color(ViewColor(), B_DARKEN_2_TINT);
692 
693 		SetHighColor(shadow);
694 		StrokeLine(rect.LeftTop(),rect.RightBottom());
695 	} else {
696 		// used as box
697 		rgb_color light = tint_color(ViewColor(), lightTint);
698 		rgb_color shadow = tint_color(ViewColor(), shadowTint);
699 
700 		BeginLineArray(4);
701 			AddLine(BPoint(rect.left, rect.bottom),
702 					BPoint(rect.left, rect.top), light);
703 			AddLine(BPoint(rect.left + 1.0f, rect.top),
704 					BPoint(rect.right, rect.top), light);
705 			AddLine(BPoint(rect.left + 1.0f, rect.bottom),
706 					BPoint(rect.right, rect.bottom), shadow);
707 			AddLine(BPoint(rect.right, rect.bottom - 1.0f),
708 					BPoint(rect.right, rect.top + 1.0f), shadow);
709 		EndLineArray();
710 	}
711 }
712 
713 
714 void
715 BBox::_DrawFancy(BRect labelBox)
716 {
717 	BRect rect = Bounds();
718 	rect.top += TopBorderOffset();
719 
720 	rgb_color base = ViewColor();
721 	if (rect.Height() == 1.0) {
722 		// used as horizontal separator
723 		be_control_look->DrawGroupFrame(this, rect, rect, base,
724 			BControlLook::B_TOP_BORDER);
725 	} else if (rect.Width() == 1.0) {
726 		// used as vertical separator
727 		be_control_look->DrawGroupFrame(this, rect, rect, base,
728 			BControlLook::B_LEFT_BORDER);
729 	} else {
730 		// used as box
731 		be_control_look->DrawGroupFrame(this, rect, rect, base);
732 	}
733 }
734 
735 
736 void
737 BBox::_ClearLabel()
738 {
739 	if (fLabel) {
740 		free(fLabel);
741 		fLabel = NULL;
742 	} else if (fLabelView) {
743 		fLabelView->RemoveSelf();
744 		delete fLabelView;
745 		fLabelView = NULL;
746 	}
747 }
748 
749 
750 BView*
751 BBox::_Child() const
752 {
753 	for (int32 i = 0; BView* view = ChildAt(i); i++) {
754 		if (view != fLabelView)
755 			return view;
756 	}
757 
758 	return NULL;
759 }
760 
761 
762 void
763 BBox::_ValidateLayoutData()
764 {
765 	if (fLayoutData->valid)
766 		return;
767 
768 	// compute the label box, width and height
769 	bool label = true;
770 	float labelHeight = 0;	// height of the label (pixel count)
771 	if (fLabel) {
772 		// leave 6 pixels of the frame, and have a gap of 4 pixels between
773 		// the frame and the text on either side
774 		font_height fontHeight;
775 		GetFontHeight(&fontHeight);
776 		fLayoutData->label_box.Set(6.0f, 0, 14.0f + StringWidth(fLabel),
777 			ceilf(fontHeight.ascent));
778 		labelHeight = ceilf(fontHeight.ascent + fontHeight.descent) + 1;
779 	} else if (fLabelView) {
780 		// the label view is placed at (0, 10) at its preferred size
781 		BSize size = fLabelView->PreferredSize();
782 		fLayoutData->label_box.Set(10, 0, 10 + size.width, size.height);
783 		labelHeight = size.height + 1;
784 	} else
785 		label = false;
786 
787 	// border
788 	switch (fStyle) {
789 		case B_PLAIN_BORDER:
790 			fLayoutData->insets.Set(1, 1, 1, 1);
791 			break;
792 		case B_FANCY_BORDER:
793 			fLayoutData->insets.Set(3, 3, 3, 3);
794 			break;
795 		case B_NO_BORDER:
796 		default:
797 			fLayoutData->insets.Set(0, 0, 0, 0);
798 			break;
799 	}
800 
801 	// if there's a label, the top inset will be dictated by the label
802 	if (label && labelHeight > fLayoutData->insets.top)
803 		fLayoutData->insets.top = labelHeight;
804 
805 	// total number of pixel the border adds
806 	float addWidth = fLayoutData->insets.left + fLayoutData->insets.right;
807 	float addHeight = fLayoutData->insets.top + fLayoutData->insets.bottom;
808 
809 	// compute the minimal width induced by the label
810 	float minWidth;
811 	if (label)
812 		minWidth = fLayoutData->label_box.right + fLayoutData->insets.right;
813 	else
814 		minWidth = addWidth - 1;
815 
816 	BAlignment alignment(B_ALIGN_HORIZONTAL_CENTER, B_ALIGN_VERTICAL_CENTER);
817 
818 	// finally consider the child constraints, if we shall support layout
819 	BView* child = _Child();
820 	if (child && (child->Flags() & B_SUPPORTS_LAYOUT)) {
821 		BSize min = child->MinSize();
822 		BSize max = child->MaxSize();
823 		BSize preferred = child->PreferredSize();
824 
825 		min.width += addWidth;
826 		min.height += addHeight;
827 		preferred.width += addWidth;
828 		preferred.height += addHeight;
829 		max.width = BLayoutUtils::AddDistances(max.width, addWidth - 1);
830 		max.height = BLayoutUtils::AddDistances(max.height, addHeight - 1);
831 
832 		if (min.width < minWidth)
833 			min.width = minWidth;
834 		BLayoutUtils::FixSizeConstraints(min, max, preferred);
835 
836 		fLayoutData->min = min;
837 		fLayoutData->max = max;
838 		fLayoutData->preferred = preferred;
839 
840 		BAlignment childAlignment = child->LayoutAlignment();
841 		if (childAlignment.horizontal == B_ALIGN_USE_FULL_WIDTH)
842 			alignment.horizontal = B_ALIGN_USE_FULL_WIDTH;
843 		if (childAlignment.vertical == B_ALIGN_USE_FULL_HEIGHT)
844 			alignment.vertical = B_ALIGN_USE_FULL_HEIGHT;
845 
846 		fLayoutData->alignment = alignment;
847 	} else {
848 		fLayoutData->min.Set(minWidth, addHeight - 1);
849 		fLayoutData->max.Set(B_SIZE_UNLIMITED, B_SIZE_UNLIMITED);
850 		fLayoutData->preferred = fLayoutData->min;
851 		fLayoutData->alignment = alignment;
852 	}
853 
854 	fLayoutData->valid = true;
855 	ResetLayoutInvalidation();
856 }
857 
858 
859 extern "C" void
860 B_IF_GCC_2(InvalidateLayout__4BBoxb, _ZN4BBox16InvalidateLayoutEb)(
861 	BBox* box, bool descendants)
862 {
863 	perform_data_layout_invalidated data;
864 	data.descendants = descendants;
865 
866 	box->Perform(PERFORM_CODE_LAYOUT_INVALIDATED, &data);
867 }
868 
869