* ViewLayer::ViewAt() must not use the screen clipping to find the view

in question as it used to find the view that is under the mouse (found
  during a short phone session with stippi :-)). This fixes bug #1714.
* The local view clipping is still not correctly maintained by the 
  app_server, but that only affects the drawing now. I've added some
  commented out code that give you some visual feedback on this problem
  (ViewLayer::MarkAt()).
* Minor cleanup.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@23663 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/servers/app/ViewLayer.cpp

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2001-2007, Haiku, Inc.
+ * Copyright (c) 2001-2008, Haiku, Inc.
  * Distributed under the terms of the MIT license.
  *
  * Authors:
@@ -171,8 +171,10 @@ ViewLayer::AttachedToWindow(WindowLayer* window)
 		fIsDesktopBackground = true;
 
 	// insert view into local token space
-	if (fWindow != NULL)
-		fWindow->ServerWindow()->App()->ViewTokens().SetToken(fToken, B_HANDLER_TOKEN, this);
+	if (fWindow != NULL) {
+		fWindow->ServerWindow()->App()->ViewTokens().SetToken(fToken,
+			B_HANDLER_TOKEN, this);
+	}
 
 	// attach child views as well
 	for (ViewLayer* child = FirstChild(); child; child = child->NextSibling())
@@ -244,7 +246,8 @@ bool
 ViewLayer::RemoveChild(ViewLayer* layer)
 {
 	if (layer->fParent != this) {
-		printf("ViewLayer::RemoveChild(%p - %s) - ViewLayer is not child of this (%p) layer!\n", layer, layer ? layer->Name() : NULL, this);
+		printf("ViewLayer::RemoveChild(%p - %s) - ViewLayer is not child of "
+			"this (%p) layer!\n", layer, layer ? layer->Name() : NULL, this);
 		return false;
 	}
 
@@ -334,34 +337,65 @@ ViewLayer::CollectTokensForChildren(BList* tokenMap) const
 }
 
 
+#if 0
+bool
+ViewLayer::MarkAt(DrawingEngine* engine, const BPoint& where, int32 level)
+{
+	BRect rect(fFrame.left, fFrame.top, fFrame.right, fFrame.bottom);
+
+	if (Parent() != NULL) {
+		Parent()->ConvertToScreen(&rect);
+		if (!rect.Contains(where))
+			return false;
+
+		engine->StrokeRect(rect, (rgb_color){level * 30, level * 30, level * 30});
+	}
+
+
+	bool found = false;
+	for (ViewLayer* child = FirstChild(); child; child = child->NextSibling()) {
+		found |= child->MarkAt(engine, where, level + 1);
+	}
+
+	if (!found) {
+		rgb_color color = {0};
+		switch (level % 2) {
+			case 0: color.green = rand() % 256; break;
+			case 1: color.blue = rand() % 256; break;
+		}
+
+		rect.InsetBy(1, 1);
+		//engine->FillRegion(fLocalClipping, (rgb_color){255, 255, 0, 10});
+		engine->StrokeRect(rect, color);
+		rect.InsetBy(1, 1);
+		engine->StrokeRect(rect, color);
+	}
+
+	return true;
+}
+#endif
+
+
 ViewLayer*
-ViewLayer::ViewAt(const BPoint& where, BRegion* windowContentClipping)
+ViewLayer::ViewAt(const BPoint& where)
 {
 	if (!fVisible)
 		return NULL;
 
-	// NOTE: if this view can draw on children, it's screen clipping
-	// excludes these children, so we need to ask those first if they
-	// contain "where", otherwise we check the screen clipping before
-	// recursing into the children
+	IntRect frame = Frame();
+	if (Parent() != NULL)
+		Parent()->ConvertToScreen(&frame);
 
-	if (!(fFlags & B_DRAW_ON_CHILDREN)) {
-		if (ScreenClipping(windowContentClipping).Contains(where))
-			return this;
-	}
+	if (!frame.Contains(where))
+		return NULL;
 
 	for (ViewLayer* child = FirstChild(); child; child = child->NextSibling()) {
-		ViewLayer* layer = child->ViewAt(where, windowContentClipping);
-		if (layer)
+		ViewLayer* layer = child->ViewAt(where);
+		if (layer != NULL)
 			return layer;
 	}
 
-	if (fFlags & B_DRAW_ON_CHILDREN) {
-		if (ScreenClipping(windowContentClipping).Contains(where))
 	return this;
-	}
-
-	return NULL;
 }
 
 
@@ -1418,8 +1452,7 @@ ViewLayer::MarkBackgroundDirty()
 
 
 void
-ViewLayer::AddTokensForLayersInRegion(BMessage* message,
-									  BRegion& region,
+ViewLayer::AddTokensForLayersInRegion(BMessage* message, BRegion& region,
 	BRegion* windowContentClipping)
 {
 	if (!fVisible)
@@ -1428,15 +1461,15 @@ ViewLayer::AddTokensForLayersInRegion(BMessage* message,
 	if (region.Intersects(ScreenClipping(windowContentClipping).Frame()))
 		message->AddInt32("_token", fToken);
 
-	for (ViewLayer* child = FirstChild(); child; child = child->NextSibling())
+	for (ViewLayer* child = FirstChild(); child; child = child->NextSibling()) {
 		child->AddTokensForLayersInRegion(message, region,
 			windowContentClipping);
+	}
 }
 
 
 void
-ViewLayer::AddTokensForLayersInRegion(BPrivate::PortLink& link,
-									  BRegion& region,
+ViewLayer::AddTokensForLayersInRegion(BPrivate::PortLink& link, BRegion& region,
 	BRegion* windowContentClipping)
 {
 	if (!fVisible)
@@ -1450,9 +1483,9 @@ ViewLayer::AddTokensForLayersInRegion(BPrivate::PortLink& link,
 	if (region.Intersects(ScreenClipping(windowContentClipping).Frame()))
 		link.Attach<int32>(fToken);
 
-	for (ViewLayer* child = FirstChild(); child; child = child->NextSibling())
-		child->AddTokensForLayersInRegion(link, region,
-										  windowContentClipping);
+	for (ViewLayer* child = FirstChild(); child; child = child->NextSibling()) {
+		child->AddTokensForLayersInRegion(link, region, windowContentClipping);
+	}
 }
 
 
@@ -1541,8 +1574,8 @@ ViewLayer::ScreenClipping(BRegion* windowContentClipping, bool force) const
 		// the parent, the local clipping does not account for this
 		IntRect clippedBounds = Bounds();
 		ConvertToVisibleInTopView(&clippedBounds);
-		if (clippedBounds.Width() < fScreenClipping.Frame().Width() ||
-			clippedBounds.Height() < fScreenClipping.Frame().Height()) {
+		if (clippedBounds.Width() < fScreenClipping.Frame().Width()
+			|| clippedBounds.Height() < fScreenClipping.Frame().Height()) {
 			BRegion* temp = fWindow->GetRegion();
 			if (temp) {
 				temp->Set((clipping_rect)clippedBounds);

src/servers/app/ViewLayer.h

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2001-2007, Haiku, Inc.
+ * Copyright (c) 2001-2008, Haiku, Inc.
  * Distributed under the terms of the MIT license.
  *
  * Authors:
@@ -101,8 +101,7 @@ class ViewLayer {
 			uint32			CountChildren(bool deep = false) const;
 			void			CollectTokensForChildren(BList* tokenMap) const;
 
-			ViewLayer*		ViewAt(const BPoint& where,
-								   BRegion* windowContentClipping);
+			ViewLayer*		ViewAt(const BPoint& where);
 
 			// coordinate conversion
 			void			ConvertToParent(BPoint* point) const;
@@ -232,6 +231,10 @@ class ViewLayer {
 
 			// debugging
 			void			PrintToStream() const;
+#if 0
+			bool			MarkAt(DrawingEngine* engine, const BPoint& where,
+								int32 level = 0);
+#endif
 
 	protected:
 			void			_MoveScreenClipping(int32 x, int32 y,

src/servers/app/WindowLayer.cpp

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2001-2007, Haiku, Inc.
+ * Copyright (c) 2001-2008, Haiku, Inc.
  * Distributed under the terms of the MIT license.
  *
  * Authors:
@@ -508,14 +508,7 @@ WindowLayer::SetTopLayer(ViewLayer* topLayer)
 ViewLayer*
 WindowLayer::ViewAt(const BPoint& where)
 {
-	ViewLayer* view = NULL;
-
-	if (!fContentRegionValid)
-		_UpdateContentRegion();
-
-	view = fTopLayer->ViewAt(where, &fContentRegion);
-
-	return view;
+	return fTopLayer->ViewAt(where);
 }
 
 
@@ -930,6 +923,17 @@ void
 WindowLayer::MouseMoved(BMessage *message, BPoint where, int32* _viewToken,
 	bool isLatestMouseMoved)
 {
+#if 0
+	if (fDecorator != NULL && fTopLayer != NULL) {
+		DrawingEngine* engine = fDecorator->GetDrawingEngine();
+		engine->LockParallelAccess();
+		engine->ConstrainClippingRegion(&VisibleRegion());
+
+		fTopLayer->MarkAt(engine, where);
+		engine->UnlockParallelAccess();
+	}
+#endif
+
 	ViewLayer* view = ViewAt(where);
 	if (view != NULL)
 		*_viewToken = view->Token();