EXP-1196 FIX Fix param block template ordering

changed ordering of template loading relative to constructor setting of params
moved a lot of constructor-set params to template files
reviewed by Leslie

84 files changed, 284 insertions, 303 deletions

diff --git a/indra/llui/llaccordionctrltab.cpp b/indra/llui/llaccordionctrltab.cpp
index 6afe276379..4b0b7c561d 100644
--- a/indra/llui/llaccordionctrltab.cpp
+++ b/indra/llui/llaccordionctrltab.cpp
@@ -339,7 +339,7 @@ LLAccordionCtrlTab::Params::Params()
 	,fit_panel("fit_panel",true)
 	,selection_enabled("selection_enabled", false)
 {
-	mouse_opaque(false);
+	changeDefault(mouse_opaque, false);
 }
 
 LLAccordionCtrlTab::LLAccordionCtrlTab(const LLAccordionCtrlTab::Params&p)
diff --git a/indra/llui/llbadge.cpp b/indra/llui/llbadge.cpp
index fde3c53a65..d59dc0d22b 100644
--- a/indra/llui/llbadge.cpp
+++ b/indra/llui/llbadge.cpp
@@ -50,10 +50,7 @@ LLBadge::Params::Params()
 	, location_percent_vcenter("location_percent_vcenter")
 	, padding_horiz("padding_horiz")
 	, padding_vert("padding_vert")
-{
-	// We set a name here so the name isn't necessary in any xml files that use badges
-	name = "badge";
-}
+{}
 
 bool LLBadge::Params::equals(const Params& a) const
 {
diff --git a/indra/llui/llbutton.cpp b/indra/llui/llbutton.cpp
index 7b015bd576..a12235c16f 100644
--- a/indra/llui/llbutton.cpp
+++ b/indra/llui/llbutton.cpp
@@ -104,8 +104,7 @@ LLButton::Params::Params()
 	handle_right_mouse("handle_right_mouse")
 {
 	addSynonym(is_toggle, "toggle");
-	held_down_delay.seconds = 0.5f;
-	initial_value.set(LLSD(false), false);
+	changeDefault(initial_value, LLSD(false));
 }
 
 
diff --git a/indra/llui/llconsole.h b/indra/llui/llconsole.h
index bb8ea50bed..f32f1dd74c 100644
--- a/indra/llui/llconsole.h
+++ b/indra/llui/llconsole.h
@@ -54,7 +54,7 @@ public:
 			persist_time("persist_time", 0.f), // forever
 			font_size_index("font_size_index")
 		{
-			mouse_opaque(false);
+			changeDefault(mouse_opaque, false);
 		}
 	};
 protected:
diff --git a/indra/llui/llcontainerview.h b/indra/llui/llcontainerview.h
index 7d3d5cf787..e81600fd6c 100644
--- a/indra/llui/llcontainerview.h
+++ b/indra/llui/llcontainerview.h
@@ -50,7 +50,7 @@ public:
 			  show_label("show_label", FALSE),
 			  display_children("display_children", TRUE)
 		{
-			mouse_opaque(false);
+			changeDefault(mouse_opaque, false);
 		}
 	};
 
diff --git a/indra/llui/lldraghandle.h b/indra/llui/lldraghandle.h
index 7c56475e75..e095e577b1 100644
--- a/indra/llui/lldraghandle.h
+++ b/indra/llui/lldraghandle.h
@@ -51,8 +51,8 @@ public:
 			drag_highlight_color("drag_highlight_color", LLUIColorTable::instance().getColor("DefaultHighlightLight")),
 			drag_shadow_color("drag_shadow_color", LLUIColorTable::instance().getColor("DefaultShadowDark"))
 		{
-			mouse_opaque(true);
-			follows.flags(FOLLOWS_ALL);
+			changeDefault(mouse_opaque, true);
+			changeDefault(follows.flags, FOLLOWS_ALL);
 		}
 	};
 	void initFromParams(const Params&);
diff --git a/indra/llui/llfiltereditor.h b/indra/llui/llfiltereditor.h
index 710699fdc1..3a05bc05a1 100644
--- a/indra/llui/llfiltereditor.h
+++ b/indra/llui/llfiltereditor.h
@@ -42,12 +42,7 @@ class LLFilterEditor : public LLSearchEditor
 {
 public:
 	struct Params : public LLInitParam::Block<Params, LLSearchEditor::Params>
-	{
-		Params()
-		{
-			name = "filter_editor";
-		}
-	};
+	{};
 
 protected:
 	LLFilterEditor(const Params&);
diff --git a/indra/llui/llfloater.cpp b/indra/llui/llfloater.cpp
index 8917d5490c..bc494e97f5 100644
--- a/indra/llui/llfloater.cpp
+++ b/indra/llui/llfloater.cpp
@@ -182,7 +182,7 @@ LLFloater::Params::Params()
 	open_callback("open_callback"),
 	close_callback("close_callback")
 {
-	visible = false;
+	changeDefault(visible, false);
 }
 
 
diff --git a/indra/llui/llflyoutbutton.h b/indra/llui/llflyoutbutton.h
index 8d59380a00..36998eba2e 100644
--- a/indra/llui/llflyoutbutton.h
+++ b/indra/llui/llflyoutbutton.h
@@ -46,7 +46,7 @@ public:
 		:	action_button("action_button"),
 		    allow_text_entry("allow_text_entry")
 		{
-			LLComboBox::Params::allow_text_entry = false;
+			changeDefault(LLComboBox::Params::allow_text_entry, false);
 		}
 
 	};
diff --git a/indra/llui/lliconctrl.cpp b/indra/llui/lliconctrl.cpp
index 47f2cfaf89..30b79b4d20 100644
--- a/indra/llui/lliconctrl.cpp
+++ b/indra/llui/lliconctrl.cpp
@@ -43,10 +43,7 @@ LLIconCtrl::Params::Params()
 	color("color"),
 	use_draw_context_alpha("use_draw_context_alpha", true),
 	scale_image("scale_image")
-{
-	tab_stop = false;
-	mouse_opaque = false;
-}
+{}
 
 LLIconCtrl::LLIconCtrl(const LLIconCtrl::Params& p)
 :	LLUICtrl(p),
diff --git a/indra/llui/lllayoutstack.cpp b/indra/llui/lllayoutstack.cpp
index a59247ba09..a250404292 100644
--- a/indra/llui/lllayoutstack.cpp
+++ b/indra/llui/lllayoutstack.cpp
@@ -115,9 +115,7 @@ LLLayoutStack::Params::Params()
 	open_time_constant("open_time_constant", 0.02f),
 	close_time_constant("close_time_constant", 0.03f),
 	border_size("border_size", LLCachedControl<S32>(*LLUI::sSettingGroups["config"], "UIResizeBarHeight", 0))
-{
-	name="stack";
-}
+{}
 
 LLLayoutStack::LLLayoutStack(const LLLayoutStack::Params& p) 
 :	LLView(p),
diff --git a/indra/llui/lllineeditor.cpp b/indra/llui/lllineeditor.cpp
index 06fbc0f234..c2173fb89c 100644
--- a/indra/llui/lllineeditor.cpp
+++ b/indra/llui/lllineeditor.cpp
@@ -103,7 +103,7 @@ LLLineEditor::Params::Params()
 	text_pad_right("text_pad_right"),
 	default_text("default_text")
 {
-	mouse_opaque = true;
+	changeDefault(mouse_opaque, true);
 	addSynonym(select_on_focus, "select_all_on_focus_received");
 	addSynonym(border, "border");
 	addSynonym(label, "watermark_text");
diff --git a/indra/llui/llmenugl.cpp b/indra/llui/llmenugl.cpp
index 8de9c769e2..6cac841cde 100644
--- a/indra/llui/llmenugl.cpp
+++ b/indra/llui/llmenugl.cpp
@@ -90,7 +90,6 @@ const S32 TEAROFF_SEPARATOR_HEIGHT_PIXELS = 10;
 const S32 MENU_ITEM_PADDING = 4;
 
 const std::string SEPARATOR_NAME("separator");
-const std::string SEPARATOR_LABEL( "-----------" );
 const std::string VERTICAL_SEPARATOR_LABEL( "|" );
 
 const std::string LLMenuGL::BOOLEAN_TRUE_PREFIX( "\xE2\x9C\x94" ); // U+2714 HEAVY CHECK MARK
@@ -149,7 +148,7 @@ LLMenuItemGL::Params::Params()
 	highlight_bg_color("highlight_bg_color"),
 	highlight_fg_color("highlight_fg_color")
 {	
-	mouse_opaque = true;
+	changeDefault(mouse_opaque, true);
 }
 
 // Default constructor
@@ -566,8 +565,6 @@ void LLMenuItemGL::handleVisibilityChange(BOOL new_visibility)
 //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 LLMenuItemSeparatorGL::Params::Params()
 {
-	name = "separator";
-	label = SEPARATOR_LABEL;
 }
 
 LLMenuItemSeparatorGL::LLMenuItemSeparatorGL(const LLMenuItemSeparatorGL::Params& p) :
@@ -755,30 +752,6 @@ U32 LLMenuItemTearOffGL::getNominalHeight( void ) const
 	return TEAROFF_SEPARATOR_HEIGHT_PIXELS; 
 }
 
-
-//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-// Class LLMenuItemBlankGL
-//
-// This class represents a blank, non-functioning item.
-//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-
-class LLMenuItemBlankGL : public LLMenuItemGL
-{
-public:
-	struct Params : public LLInitParam::Block<Params, LLMenuItemGL::Params>
-	{
-		Params()
-		{
-			name="";
-			enabled = false;
-		}
-	};
-	LLMenuItemBlankGL( const Params& p ) :	LLMenuItemGL( p )
-	{}
-	virtual void draw( void ) {}
-};
-
-
 ///============================================================================
 /// Class LLMenuItemCallGL
 ///============================================================================
diff --git a/indra/llui/llmenugl.h b/indra/llui/llmenugl.h
index 7bde8e83ec..b5579a831a 100644
--- a/indra/llui/llmenugl.h
+++ b/indra/llui/llmenugl.h
@@ -381,8 +381,6 @@ public:
 		{
 			addSynonym(bg_visible, "opaque");
 			addSynonym(bg_color, "color");
-
-			name = "menu";
 		}
 	};
 
@@ -650,7 +648,7 @@ public:
 	{
 		Params()
 		{
-			visible = false;
+			changeDefault(visible, false);
 		}
 	};
 
@@ -698,16 +696,7 @@ class LLMenuBarGL : public LLMenuGL
 {
 public:
 	struct Params : public LLInitParam::Block<Params, LLMenuGL::Params>
-	{
-		Params()
-		{
-			can_tear_off = false;
-			keep_fixed_size = true;
-			horizontal_layout = true;
-			visible = true;
-			drop_shadow = false;
-		}
-	};
+	{};
 	LLMenuBarGL( const Params& p );
 	virtual ~LLMenuBarGL();
 
@@ -825,13 +814,7 @@ class LLMenuItemTearOffGL : public LLMenuItemGL
 {
 public:
 	struct Params : public LLInitParam::Block<Params, LLMenuItemGL::Params>
-	{
-		Params()
-		{
-			name = "tear off";
-			label = "~~~~~~~~~~~";
-		}
-	};
+	{};
 
 	LLMenuItemTearOffGL( const Params& );
 	
diff --git a/indra/llui/llmultislider.cpp b/indra/llui/llmultislider.cpp
index 9052bc7d1d..70bcfb5b4f 100644
--- a/indra/llui/llmultislider.cpp
+++ b/indra/llui/llmultislider.cpp
@@ -66,11 +66,7 @@ LLMultiSlider::Params::Params()
 	mouse_up_callback("mouse_up_callback"),
 	thumb_width("thumb_width"),
 	sliders("slider")
-{
-	name = "multi_slider_bar";
-	mouse_opaque(true);
-	follows.flags(FOLLOWS_LEFT | FOLLOWS_TOP);
-}
+{}
 
 LLMultiSlider::LLMultiSlider(const LLMultiSlider::Params& p)
 :	LLF32UICtrl(p),
diff --git a/indra/llui/llpanel.cpp b/indra/llui/llpanel.cpp
index e3193bc352..a45b617c2e 100644
--- a/indra/llui/llpanel.cpp
+++ b/indra/llui/llpanel.cpp
@@ -90,7 +90,6 @@ LLPanel::Params::Params()
 	visible_callback("visible_callback"),
 	accepts_badge("accepts_badge")
 {
-	name = "panel";
 	addSynonym(background_visible, "bg_visible");
 	addSynonym(has_border, "border_visible");
 	addSynonym(label, "title");
diff --git a/indra/llui/llradiogroup.cpp b/indra/llui/llradiogroup.cpp
index 3a12debf7e..95a7d09382 100644
--- a/indra/llui/llradiogroup.cpp
+++ b/indra/llui/llradiogroup.cpp
@@ -74,9 +74,6 @@ LLRadioGroup::Params::Params()
 {
 	addSynonym(items, "radio_item");
 
-	name = "radio_group";
-	mouse_opaque = true;
-	follows.flags = FOLLOWS_LEFT | FOLLOWS_TOP;
 	// radio items are not tabbable until they are selected
 	tab_stop = false;
 }
@@ -96,7 +93,10 @@ void LLRadioGroup::initFromParams(const Params& p)
 	{
 		LLRadioGroup::ItemParams item_params(*it);
 
-		item_params.font.setIfNotProvided(mFont); // apply radio group font by default
+		if (!item_params.font.isProvided())
+		{
+			item_params.font = mFont; // apply radio group font by default
+		}
 		item_params.commit_callback.function = boost::bind(&LLRadioGroup::onClickButton, this, _1);
 		item_params.from_xui = p.from_xui;
 		if (p.from_xui)
diff --git a/indra/llui/llscrollbar.cpp b/indra/llui/llscrollbar.cpp
index 3a867a10a7..5d3bf7a670 100644
--- a/indra/llui/llscrollbar.cpp
+++ b/indra/llui/llscrollbar.cpp
@@ -63,9 +63,7 @@ LLScrollbar::Params::Params()
 	right_button("right_button"),
 	bg_visible("bg_visible", false),
 	bg_color("bg_color", LLColor4::black)
-{
-	tab_stop = false;
-}
+{}
 
 LLScrollbar::LLScrollbar(const Params & p)
 :		LLUICtrl(p),
diff --git a/indra/llui/llscrollcontainer.cpp b/indra/llui/llscrollcontainer.cpp
index 380c477eb2..b44b4c36b6 100644
--- a/indra/llui/llscrollcontainer.cpp
+++ b/indra/llui/llscrollcontainer.cpp
@@ -74,11 +74,7 @@ LLScrollContainer::Params::Params()
 	min_auto_scroll_rate("min_auto_scroll_rate", 100),
 	max_auto_scroll_rate("max_auto_scroll_rate", 1000),
 	reserve_scroll_corner("reserve_scroll_corner", false)
-{
-	name = "scroll_container";
-	mouse_opaque(true);
-	tab_stop(false);
-}
+{}
 
 
 // Default constructor
diff --git a/indra/llui/llscrollingpanellist.h b/indra/llui/llscrollingpanellist.h
index 8f569c2a58..e8df176ec3 100644
--- a/indra/llui/llscrollingpanellist.h
+++ b/indra/llui/llscrollingpanellist.h
@@ -51,12 +51,7 @@ class LLScrollingPanelList : public LLUICtrl
 {
 public:
 	struct Params : public LLInitParam::Block<Params, LLUICtrl::Params>
-	{
-		Params()
-		{
-			name = "scrolling_panel_list";
-		}
-	};
+	{};
 	LLScrollingPanelList(const Params& p)
 	:	LLUICtrl(p) 
 	{}
diff --git a/indra/llui/llscrolllistcolumn.cpp b/indra/llui/llscrolllistcolumn.cpp
index 696e4a2bb1..07a6dfaa10 100644
--- a/indra/llui/llscrolllistcolumn.cpp
+++ b/indra/llui/llscrolllistcolumn.cpp
@@ -46,10 +46,7 @@ static LLWidgetNameRegistry::StaticRegistrar sRegisterColumnHeaderParams(&typeid
 //---------------------------------------------------------------------------
 LLScrollColumnHeader::Params::Params()
 :	column("column")
-{
-	name  = "column_header";
-	tab_stop(false);
-}
+{}
 
 
 LLScrollColumnHeader::LLScrollColumnHeader(const LLScrollColumnHeader::Params& p) 
diff --git a/indra/llui/llscrolllistcolumn.h b/indra/llui/llscrolllistcolumn.h
index e2711ac75a..12baea8e0c 100644
--- a/indra/llui/llscrolllistcolumn.h
+++ b/indra/llui/llscrolllistcolumn.h
@@ -135,7 +135,7 @@ public:
 			halign("halign", LLFontGL::LEFT)
 		{
 			// default choice to "dynamic_width"
-			width.dynamic_width = true;
+			changeDefault(width.dynamic_width, true);
 
 			addSynonym(sort_column, "sort");
 		}
diff --git a/indra/llui/llscrolllistctrl.cpp b/indra/llui/llscrolllistctrl.cpp
index b7848ec37c..622f3e215c 100644
--- a/indra/llui/llscrolllistctrl.cpp
+++ b/indra/llui/llscrolllistctrl.cpp
@@ -147,12 +147,9 @@ LLScrollListCtrl::Params::Params()
 	highlighted_color("highlighted_color"),
 	contents(""),
 	scroll_bar_bg_visible("scroll_bar_bg_visible"),
-	scroll_bar_bg_color("scroll_bar_bg_color")
-	, border("border")
-{
-	name = "scroll_list";
-	mouse_opaque = true;
-}
+	scroll_bar_bg_color("scroll_bar_bg_color"), 
+	border("border")
+{}
 
 LLScrollListCtrl::LLScrollListCtrl(const LLScrollListCtrl::Params& p)
 :	LLUICtrl(p),
@@ -2813,7 +2810,10 @@ LLScrollListItem* LLScrollListCtrl::addRow(LLScrollListItem *new_item, const LLS
 		}
 
 		S32 index = columnp->mIndex;
-		cell_p.width.setIfNotProvided(columnp->getWidth());
+		if (!cell_p.width.isProvided())
+		{
+			cell_p.width = columnp->getWidth();
+		}
 
 		LLScrollListCell* cell = LLScrollListCell::create(cell_p);
 
diff --git a/indra/llui/llsearcheditor.h b/indra/llui/llsearcheditor.h
index f5c3b532c4..c2d7916938 100644
--- a/indra/llui/llsearcheditor.h
+++ b/indra/llui/llsearcheditor.h
@@ -55,9 +55,7 @@ public:
 			search_button_visible("search_button_visible"),
 			clear_button("clear_button"), 
 			clear_button_visible("clear_button_visible")
-		{
-			name = "search_editor";
-		}
+		{}
 	};
 
 	void setCommitOnFocusLost(BOOL b)	{ if (mSearchEditor) mSearchEditor->setCommitOnFocusLost(b); }
diff --git a/indra/llui/llslider.cpp b/indra/llui/llslider.cpp
index 013950a5ad..db72234f94 100644
--- a/indra/llui/llslider.cpp
+++ b/indra/llui/llslider.cpp
@@ -54,9 +54,7 @@ LLSlider::Params::Params()
 	track_highlight_vertical_image("track_highlight_vertical_image"),
 	mouse_down_callback("mouse_down_callback"),
 	mouse_up_callback("mouse_up_callback")
-{
-	follows.flags(FOLLOWS_LEFT | FOLLOWS_TOP);
-}
+{}
 
 LLSlider::LLSlider(const LLSlider::Params& p)
 :	LLF32UICtrl(p),
diff --git a/indra/llui/llsliderctrl.cpp b/indra/llui/llsliderctrl.cpp
index d760178e35..583ed1ed2e 100644
--- a/indra/llui/llsliderctrl.cpp
+++ b/indra/llui/llsliderctrl.cpp
@@ -76,8 +76,14 @@ LLSliderCtrl::LLSliderCtrl(const LLSliderCtrl::Params& p)
 		}
 		LLRect label_rect( left, top, label_width, bottom );
 		LLTextBox::Params params(p.slider_label);
-		params.rect.setIfNotProvided(label_rect);
-		params.font.setIfNotProvided(p.font);
+		if (!params.rect.isProvided())
+		{
+			params.rect = label_rect;
+		}
+		if (!params.font.isProvided())
+		{
+			params.font = p.font;
+		}
 		params.initial_value(p.label());
 		mLabelBox = LLUICtrlFactory::create<LLTextBox> (params);
 		addChild(mLabelBox);
@@ -113,15 +119,33 @@ LLSliderCtrl::LLSliderCtrl(const LLSliderCtrl::Params& p)
 	S32 slider_left = label_width ? label_width + sliderctrl_spacing : 0;
 	LLSlider::Params slider_p(p.slider_bar);
 	slider_p.name("slider_bar");
-	slider_p.rect.setIfNotProvided(LLRect(slider_left,top,slider_right,bottom));
-	slider_p.initial_value.setIfNotProvided(p.initial_value().asReal());
-	slider_p.min_value.setIfNotProvided(p.min_value);
-	slider_p.max_value.setIfNotProvided(p.max_value);
-	slider_p.increment.setIfNotProvided(p.increment);
-	slider_p.orientation.setIfNotProvided(p.orientation);
+	if (!slider_p.rect.isProvided())
+	{
+		slider_p.rect = LLRect(slider_left,top,slider_right,bottom);
+	}
+	if (!slider_p.initial_value.isProvided())
+	{
+		slider_p.initial_value = p.initial_value().asReal();
+	}
+	if (!slider_p.min_value.isProvided())
+	{
+		slider_p.min_value = p.min_value;
+	}
+	if (!slider_p.max_value.isProvided())
+	{
+		slider_p.max_value = p.max_value;
+	}
+	if (!slider_p.increment.isProvided())
+	{
+		slider_p.increment = p.increment;
+	}
+	if (!slider_p.orientation.isProvided())
+	{
+		slider_p.orientation = p.orientation;
+	}
 	
-	slider_p.commit_callback.function(&LLSliderCtrl::onSliderCommit);
-	slider_p.control_name(p.control_name);
+	slider_p.commit_callback.function = &LLSliderCtrl::onSliderCommit;
+	slider_p.control_name = p.control_name;
 	slider_p.mouse_down_callback( p.mouse_down_callback );
 	slider_p.mouse_up_callback( p.mouse_up_callback );
 	mSlider = LLUICtrlFactory::create<LLSlider> (slider_p);
@@ -134,8 +158,15 @@ LLSliderCtrl::LLSliderCtrl(const LLSliderCtrl::Params& p)
 		if( p.can_edit_text() )
 		{
 			LLLineEditor::Params line_p(p.value_editor);
-			line_p.rect.setIfNotProvided(text_rect);
-			line_p.font.setIfNotProvided(p.font);
+			if (!line_p.rect.isProvided())
+			{
+				line_p.rect = text_rect;
+			}
+			if (!line_p.font.isProvided())
+			{
+				line_p.font = p.font;
+			}
+			
 			line_p.commit_callback.function(&LLSliderCtrl::onEditorCommit);
 			line_p.prevalidate_callback(&LLTextValidate::validateFloat);
 			mEditor = LLUICtrlFactory::create<LLLineEditor>(line_p);
@@ -149,8 +180,14 @@ LLSliderCtrl::LLSliderCtrl(const LLSliderCtrl::Params& p)
 		else
 		{
 			LLTextBox::Params text_p(p.value_text);
-			text_p.rect.setIfNotProvided(text_rect);
-			text_p.font.setIfNotProvided(p.font);
+			if (!text_p.rect.isProvided())
+			{
+				text_p.rect = text_rect;
+			}
+			if (!text_p.font.isProvided())
+			{
+				text_p.font = p.font;
+			}
 			mTextBox = LLUICtrlFactory::create<LLTextBox>(text_p);
 			addChild(mTextBox);
 		}
diff --git a/indra/llui/llstatbar.h b/indra/llui/llstatbar.h
index 62a9db82fe..513fff3234 100644
--- a/indra/llui/llstatbar.h
+++ b/indra/llui/llstatbar.h
@@ -65,7 +65,7 @@ public:
 			  show_mean("show_mean", TRUE),
 			  stat("stat")
 		{
-			follows.flags(FOLLOWS_TOP | FOLLOWS_LEFT);
+			changeDefault(follows.flags, FOLLOWS_TOP | FOLLOWS_LEFT);
 		}
 	};
 	LLStatBar(const Params&);
diff --git a/indra/llui/llstatview.h b/indra/llui/llstatview.h
index 22a9fcd672..5abdc42448 100644
--- a/indra/llui/llstatview.h
+++ b/indra/llui/llstatview.h
@@ -46,7 +46,7 @@ public:
 		Params() 
 		:	setting("setting")
 		{
-			follows.flags(FOLLOWS_TOP | FOLLOWS_LEFT);
+			changeDefault(follows.flags, FOLLOWS_TOP | FOLLOWS_LEFT);
 		}
 	};
 
diff --git a/indra/llui/lltabcontainer.cpp b/indra/llui/lltabcontainer.cpp
index 7f0d650403..9c6a76822c 100644
--- a/indra/llui/lltabcontainer.cpp
+++ b/indra/llui/lltabcontainer.cpp
@@ -217,10 +217,7 @@ LLTabContainer::Params::Params()
 	tab_icon_ctrl_pad("tab_icon_ctrl_pad", 0),
 	use_ellipses("use_ellipses"),
 	font_halign("halign")
-{
-	name(std::string("tab_container"));
-	mouse_opaque = false;
-}
+{}
 
 LLTabContainer::LLTabContainer(const LLTabContainer::Params& p)
 :	LLPanel(p),
diff --git a/indra/llui/lltooltip.cpp b/indra/llui/lltooltip.cpp
index 6390039794..bc6461a0c2 100644
--- a/indra/llui/lltooltip.cpp
+++ b/indra/llui/lltooltip.cpp
@@ -55,7 +55,7 @@ static LLDefaultChildRegistry::Register<LLToolTipView> register_tooltip_view("to
 
 LLToolTipView::Params::Params()
 {
-	mouse_opaque = false;
+	changeDefault(mouse_opaque, false);
 }
 
 LLToolTipView::LLToolTipView(const LLToolTipView::Params& p)
@@ -156,7 +156,7 @@ LLToolTip::Params::Params()
 	web_based_media("web_based_media", false),
 	media_playing("media_playing", false)
 {
-	chrome = true;
+	changeDefault(chrome, true);
 }
 
 LLToolTip::LLToolTip(const LLToolTip::Params& p)
@@ -402,12 +402,12 @@ void LLToolTipMgr::createToolTip(const LLToolTip::Params& params)
 
 	LLToolTip::Params tooltip_params(params);
 	// block mouse events if there is a click handler registered (specifically, hover)
-	if (params.click_callback.isProvided())
+	if (params.click_callback.isProvided() && !params.mouse_opaque.isProvided())
 	{
 		// set mouse_opaque to true if it wasn't already set to something else
 		// this prevents mouse down from going "through" the tooltip and ultimately
 		// causing the tooltip to disappear
-		tooltip_params.mouse_opaque.setIfNotProvided(true);
+		tooltip_params.mouse_opaque = true;
 	}
 	tooltip_params.rect = LLRect (0, 1, 1, 0);
 
diff --git a/indra/llui/lluictrlfactory.h b/indra/llui/lluictrlfactory.h
index 499b97f52d..f0ba7fc7d7 100644
--- a/indra/llui/lluictrlfactory.h
+++ b/indra/llui/lluictrlfactory.h
@@ -104,14 +104,17 @@ private:
 	public:
 		ParamDefaults()
 		{
-			// recursively initialize from base class param block
-			((typename PARAM_BLOCK::base_block_t&)mPrototype).fillFrom(ParamDefaults<typename PARAM_BLOCK::base_block_t, DUMMY>::instance().get());
-			// after initializing base classes, look up template file for this param block
+			// look up template file for this param block...
 			const std::string* param_block_tag = getWidgetTag(&typeid(PARAM_BLOCK));
 			if (param_block_tag)
-			{
-				LLUICtrlFactory::loadWidgetTemplate(*param_block_tag, mPrototype);
+			{	// ...and if it exists, back fill values using the most specific template first
+				PARAM_BLOCK params;
+				LLUICtrlFactory::loadWidgetTemplate(*param_block_tag, params);
+				mPrototype.fillFrom(params);
 			}
+			// recursively fill from base class param block
+			((typename PARAM_BLOCK::base_block_t&)mPrototype).fillFrom(ParamDefaults<typename PARAM_BLOCK::base_block_t, DUMMY>::instance().get());
+
 		}
 
 		const PARAM_BLOCK& get() { return mPrototype; }
diff --git a/indra/llui/llview.cpp b/indra/llui/llview.cpp
index 659a54cc6e..6a9384367d 100644
--- a/indra/llui/llview.cpp
+++ b/indra/llui/llview.cpp
@@ -2485,7 +2485,7 @@ void LLView::applyXUILayout(LLView::Params& p, LLView* parent)
 	{
 		LLRect parent_rect = parent->getLocalRect();
 		// overwrite uninitialized rect params, using context
-		LLRect last_rect = parent->getLocalRect();
+		LLRect default_rect = parent->getLocalRect();
 
 		bool layout_topleft = (p.layout() == "topleft");
 
@@ -2509,15 +2509,13 @@ void LLView::applyXUILayout(LLView::Params& p, LLView* parent)
 			p.rect.height = MIN_WIDGET_HEIGHT;
 		}
 
-		last_rect.translate(0, last_rect.getHeight());
+		default_rect.translate(0, default_rect.getHeight());
 
 		// If there was a recently constructed child, use its rectangle
-		get_last_child_rect(parent, &last_rect);
+		get_last_child_rect(parent, &default_rect);
 
 		if (layout_topleft)
 		{
-			p.bottom_delta.setIfNotProvided(0, false);
-
 			// Invert the sense of bottom_delta for topleft layout
 			if (p.bottom_delta.isProvided())
 			{
@@ -2530,33 +2528,44 @@ void LLView::applyXUILayout(LLView::Params& p, LLView* parent)
 			else if (p.top_delta.isProvided())
 			{
 				p.bottom_delta =
-					-(p.top_delta + p.rect.height - last_rect.getHeight());
+					-(p.top_delta + p.rect.height - default_rect.getHeight());
 			}
-			else if (!p.bottom_delta.isProvided()
-					 && !p.left_delta.isProvided()
-					 && !p.top_pad.isProvided()
+			else if (!p.left_delta.isProvided()
 					 && !p.left_pad.isProvided())
 			{
 				// set default position is just below last rect
 				p.bottom_delta.set(-(p.rect.height + VPAD), false);
 			}
+			else
+			{
+				p.bottom_delta.set(0, false);
+			}
 	
 			// default to same left edge
-			p.left_delta.setIfNotProvided(0, false);
+			if (!p.left_delta.isProvided())
+			{
+				p.left_delta.set(0, false);
+			}
 			if (p.left_pad.isProvided())
 			{
 				// left_pad is based on prior widget's right edge
 				p.left_delta.set(p.left_pad + last_rect.getWidth(), false);
 			}
 			
-			last_rect.translate(p.left_delta, p.bottom_delta);				
+			default_rect.translate(p.left_delta, p.bottom_delta);				
 		}
 		else
 		{	
 			// set default position is just below last rect
-			p.bottom_delta.setIfNotProvided(-(p.rect.height + VPAD), false);
-			p.left_delta.setIfNotProvided(0, false);
-			last_rect.translate(p.left_delta, p.bottom_delta);
+			if (!p.bottom_delta.isProvided())
+			{
+				p.bottom_delta.set(-(p.rect.height + VPAD), false);
+			}
+			if (!p.left_delta.isProvided())
+			{
+				p.left_delta.set(0, false);
+			}
+			default_rect.translate(p.left_delta, p.bottom_delta);
 		}
 
 		// this handles case where *both* x and x_delta are provided
@@ -2567,12 +2576,30 @@ void LLView::applyXUILayout(LLView::Params& p, LLView* parent)
 		// selectively apply rectangle defaults, making sure that
 		// params are not flagged as having been "provided"
 		// as rect params are overconstrained and rely on provided flags
-		p.rect.left.setIfNotProvided(last_rect.mLeft, false);
-		p.rect.bottom.setIfNotProvided(last_rect.mBottom, false);
-		p.rect.top.setIfNotProvided(last_rect.mTop, false);
-		p.rect.right.setIfNotProvided(last_rect.mRight, false);
-		p.rect.width.setIfNotProvided(last_rect.getWidth(), false);
-		p.rect.height.setIfNotProvided(last_rect.getHeight(), false);
+		if (!p.rect.left.isProvided())
+		{
+			p.rect.left.set(default_rect.mLeft, false);
+		}
+		if (!p.rect.bottom.isProvided())
+		{
+			p.rect.bottom.set(default_rect.mBottom, false);
+		}
+		if (!p.rect.top.isProvided())
+		{
+			p.rect.top.set(default_rect.mTop, false);
+		}
+		if (!p.rect.right.isProvided())
+		{
+			p.rect.right.set(default_rect.mRight, false);
+		}
+		if (!p.rect.width.isProvided())
+		{
+			p.rect.width.set(default_rect.getWidth(), false);
+		}
+		if (!p.rect.height.isProvided())
+		{
+			p.rect.height.set(default_rect.getHeight(), false);
+		}
 	}
 }
 
diff --git a/indra/llui/llviewborder.cpp b/indra/llui/llviewborder.cpp
index 32d7ea7c25..919267dcc6 100644
--- a/indra/llui/llviewborder.cpp
+++ b/indra/llui/llviewborder.cpp
@@ -57,9 +57,6 @@ LLViewBorder::Params::Params()
 {
 	addSynonym(border_thickness, "thickness");
 	addSynonym(render_style, "style");
-	name = "view_border";
-	mouse_opaque = false;
-	follows.flags = FOLLOWS_ALL;
 }
 
 
diff --git a/indra/llui/llwindowshade.cpp b/indra/llui/llwindowshade.cpp
index 77e94385d4..cf76202215 100644
--- a/indra/llui/llwindowshade.cpp
+++ b/indra/llui/llwindowshade.cpp
@@ -43,7 +43,7 @@ LLWindowShade::Params::Params()
 	text_color("text_color"),
 	can_close("can_close", true)
 {
-	mouse_opaque = false;
+	changeDefault(mouse_opaque, false);
 }
 
 LLWindowShade::LLWindowShade(const LLWindowShade::Params& params)
diff --git a/indra/llxuixml/llinitparam.h b/indra/llxuixml/llinitparam.h
index 194ef8af6a..e40bdb4a3d 100644
--- a/indra/llxuixml/llinitparam.h
+++ b/indra/llxuixml/llinitparam.h
@@ -717,14 +717,6 @@ namespace LLInitParam
 			Param::enclosingBlock().paramChanged(*this, flag_as_provided);
 		}
 
-		void setIfNotProvided(value_assignment_t val, bool flag_as_provided = true)
-		{
-			if (!isProvided())
-			{
-				set(val, flag_as_provided);
-			}
-		}
-
 		// implicit conversion
 		operator value_assignment_t() const { return param_value_t::getValue(); } 
 		// explicit conversion
@@ -869,14 +861,6 @@ namespace LLInitParam
 			Param::enclosingBlock().paramChanged(*this, flag_as_provided);
 		}
 
-		void setIfNotProvided(value_assignment_t val, bool flag_as_provided = true)
-		{
-			if (!isProvided())
-			{
-				set(val, flag_as_provided);
-			}
-		}
-
 		// propagate changed status up to enclosing block
 		/*virtual*/ void paramChanged(const Param& changed_param, bool user_provided)
 		{ 
@@ -1033,15 +1017,6 @@ namespace LLInitParam
 			Param::enclosingBlock().paramChanged(*this, flag_as_provided);
 		}
 
-
-		void setIfNotProvided(value_assignment_t val, bool flag_as_provided = true)
-		{
-			if (!isProvided())
-			{
-				set(val, flag_as_provided);
-			}
-		}
-
 		value_t& add()
 		{
 			mValues.push_back(param_value_t(value_t()));
@@ -1232,14 +1207,6 @@ namespace LLInitParam
 			Param::enclosingBlock().paramChanged(*this, flag_as_provided);
 		}
 
-		void setIfNotProvided(value_assignment_t val, bool flag_as_provided = true)
-		{
-			if (!isProvided())
-			{
-				set(val, flag_as_provided);
-			}
-		}
-
 		value_t& add()
 		{
 			mValues.push_back(value_t());
@@ -1719,6 +1686,17 @@ namespace LLInitParam
 			static BlockDescriptor sBlockDescriptor;
 			return sBlockDescriptor;
 		}
+
+		template <typename T, typename NAME_VALUE_LOOKUP, bool multiple, bool is_block>
+		void changeDefault(TypedParam<T, NAME_VALUE_LOOKUP, multiple, is_block>& param, 
+			typename TypedParam<T, NAME_VALUE_LOOKUP, multiple, is_block>::value_assignment_t value)
+		{
+			if (!param.isProvided())
+			{
+				param.set(value, false);
+			}
+		}
+
 	};
 	
 	template<typename T>
diff --git a/indra/newview/llavatariconctrl.cpp b/indra/newview/llavatariconctrl.cpp
index d0f4d19f56..42e7decec1 100644
--- a/indra/newview/llavatariconctrl.cpp
+++ b/indra/newview/llavatariconctrl.cpp
@@ -141,7 +141,6 @@ LLAvatarIconCtrl::Params::Params()
 	draw_tooltip("draw_tooltip", true),
 	default_icon_name("default_icon_name")
 {
-	name = "avatar_icon";
 }
 
 
diff --git a/indra/newview/llchannelmanager.h b/indra/newview/llchannelmanager.h
index db936b28d9..1a0b98f6cf 100644
--- a/indra/newview/llchannelmanager.h
+++ b/indra/newview/llchannelmanager.h
@@ -43,7 +43,7 @@ namespace LLNotificationsUI
  */
 class LLChannelManager : public LLSingleton<LLChannelManager>
 {
-public:	
+public:
 	struct Params
 	{
 		LLUUID				id;
@@ -51,7 +51,8 @@ public:
 		EToastAlignment		toast_align;
 		EChannelAlignment	channel_align;
 
-		Params():	id(LLUUID("")), display_toasts_always(false), toast_align(NA_BOTTOM), channel_align(CA_LEFT)
+		Params()
+		:	id(LLUUID("")), display_toasts_always(false), toast_align(NA_BOTTOM), channel_align(CA_LEFT)
 		{}
 	};
 
diff --git a/indra/newview/llchatmsgbox.cpp b/indra/newview/llchatmsgbox.cpp
index 024ccbcd0b..aa6c9c094c 100644
--- a/indra/newview/llchatmsgbox.cpp
+++ b/indra/newview/llchatmsgbox.cpp
@@ -70,7 +70,7 @@ private:
 LLChatMsgBox::Params::Params() :
 	block_spacing("block_spacing", 10)
 {
-	line_spacing.pixels = 4;
+	changeDefault(line_spacing.pixels, 4);
 }
 
 LLChatMsgBox::LLChatMsgBox(const Params& p) :
diff --git a/indra/newview/llchiclet.cpp b/indra/newview/llchiclet.cpp
index 3000209aad..245157923d 100644
--- a/indra/newview/llchiclet.cpp
+++ b/indra/newview/llchiclet.cpp
@@ -126,9 +126,9 @@ LLSysWellChiclet::Params::Params()
 , unread_notifications("unread_notifications")
 , max_displayed_count("max_displayed_count", 99)
 {
-	button.name("button");
-	button.tab_stop(FALSE);
-	button.label(LLStringUtil::null);
+	button.name = "button";
+	button.tab_stop = FALSE;
+	button.label = LLStringUtil::null;
 }
 
 LLSysWellChiclet::LLSysWellChiclet(const Params& p)
diff --git a/indra/newview/llchiclet.h b/indra/newview/llchiclet.h
index a6e12006a1..1f1069dcb4 100644
--- a/indra/newview/llchiclet.h
+++ b/indra/newview/llchiclet.h
@@ -107,9 +107,9 @@ public:
 	{
 		Params()
 		{
-			draw_tooltip(FALSE);
-			mouse_opaque(FALSE);
-			default_icon_name("Generic_Person");
+			changeDefault(draw_tooltip, FALSE);
+			changeDefault(mouse_opaque, FALSE);
+			changeDefault(default_icon_name, "Generic_Person");
 		};
 	};
 
@@ -131,9 +131,8 @@ public:
 		Optional<std::string> default_icon;
 
 		Params()
-		 : default_icon("default_icon", "Generic_Group")
-		{
-		};
+		:	default_icon("default_icon", "Generic_Group")
+		{}
 	};
 
 	/**
@@ -162,9 +161,9 @@ public:
 		Optional<std::string> default_icon;
 
 		Params()
-		 : default_icon("default_icon", "Generic_Object_Small")
+		:	default_icon("default_icon", "Generic_Object_Small")
 		{
-			avatar_id = LLUUID::null;
+			changeDefault(avatar_id, LLUUID::null);
 		};
 	};
 
@@ -314,9 +313,7 @@ public:
 		TYPE_AD_HOC
 	};
 	struct Params : public LLInitParam::Block<Params, LLChiclet::Params>
-	{
-		Params(){}
-	};
+	{};
 
 	
 	virtual ~LLIMChiclet() {};
diff --git a/indra/newview/llcolorswatch.cpp b/indra/newview/llcolorswatch.cpp
index d77ebc5367..5b942f283a 100644
--- a/indra/newview/llcolorswatch.cpp
+++ b/indra/newview/llcolorswatch.cpp
@@ -57,7 +57,6 @@ LLColorSwatchCtrl::Params::Params()
 	caption_text("caption_text"),
 	border("border")
 {
-	name = "colorswatch";
 }
 
 LLColorSwatchCtrl::LLColorSwatchCtrl(const Params& p)
diff --git a/indra/newview/lldebugview.h b/indra/newview/lldebugview.h
index 5245f163c0..20262fc89e 100644
--- a/indra/newview/lldebugview.h
+++ b/indra/newview/lldebugview.h
@@ -48,7 +48,7 @@ public:
 	{
 		Params()
 		{
-			mouse_opaque = false;
+			changeDefault(mouse_opaque, false);
 		}
 	};
 	LLDebugView(const Params&);
diff --git a/indra/newview/llfolderviewitem.cpp b/indra/newview/llfolderviewitem.cpp
index e2b7c45eab..47e99b7f82 100644
--- a/indra/newview/llfolderviewitem.cpp
+++ b/indra/newview/llfolderviewitem.cpp
@@ -101,10 +101,7 @@ LLFolderViewItem::Params::Params()
 	item_height("item_height"),
 	item_top_pad("item_top_pad"),
 	creation_date()
-{
-	mouse_opaque(true);
-	follows.flags(FOLLOWS_LEFT|FOLLOWS_TOP|FOLLOWS_RIGHT);
-}
+{}
 
 // Default constructor
 LLFolderViewItem::LLFolderViewItem(const LLFolderViewItem::Params& p)
diff --git a/indra/newview/lljoystickbutton.h b/indra/newview/lljoystickbutton.h
index 93e2e7128b..8d76aa9531 100644
--- a/indra/newview/lljoystickbutton.h
+++ b/indra/newview/lljoystickbutton.h
@@ -57,7 +57,7 @@ public:
 		Params()
 		:	quadrant("quadrant", JQ_ORIGIN)
 		{
-			label = "";
+			changeDefault(label, "");
 		}
 	};
 	LLJoystick(const Params&);
@@ -137,7 +137,7 @@ public:
 	{
 		Params()
 		{
-			held_down_delay.seconds(0.0);
+			changeDefault(held_down_delay.seconds, 0.0);
 		}
 	};
 
diff --git a/indra/newview/llmediactrl.cpp b/indra/newview/llmediactrl.cpp
index 5bbef78dd4..0bdeb114f5 100644
--- a/indra/newview/llmediactrl.cpp
+++ b/indra/newview/llmediactrl.cpp
@@ -79,7 +79,6 @@ LLMediaCtrl::Params::Params()
 	trusted_content("trusted_content", false),
 	focus_on_click("focus_on_click", true)
 {
-	tab_stop(false);
 }
 
 LLMediaCtrl::LLMediaCtrl( const Params& p) :
diff --git a/indra/newview/llmemoryview.h b/indra/newview/llmemoryview.h
index 9bdc59ab10..dc4849a9c4 100644
--- a/indra/newview/llmemoryview.h
+++ b/indra/newview/llmemoryview.h
@@ -38,8 +38,8 @@ public:
 	{
 		Params()
 		{
-			mouse_opaque = true;
-			visible = false;
+			changeDefault(mouse_opaque, true);
+			changeDefault(visible, false);
 		}
 	};
 	LLMemoryView(const LLMemoryView::Params&);
diff --git a/indra/newview/llmorphview.h b/indra/newview/llmorphview.h
index 1d8ee8e944..318d49bba5 100644
--- a/indra/newview/llmorphview.h
+++ b/indra/newview/llmorphview.h
@@ -40,8 +40,8 @@ public:
 	{
 		Params()
 		{
-			mouse_opaque(false);
-			follows.flags(FOLLOWS_ALL);
+			changeDefault(mouse_opaque, false);
+			changeDefault(follows.flags, FOLLOWS_ALL);
 		}
 	};
 	LLMorphView(const LLMorphView::Params&);
diff --git a/indra/newview/llnamelistctrl.cpp b/indra/newview/llnamelistctrl.cpp
index afceb58ccf..4e28d1f526 100644
--- a/indra/newview/llnamelistctrl.cpp
+++ b/indra/newview/llnamelistctrl.cpp
@@ -57,7 +57,6 @@ LLNameListCtrl::Params::Params()
 	allow_calling_card_drop("allow_calling_card_drop", false),
 	short_names("short_names", false)
 {
-	name = "name_list";
 }
 
 LLNameListCtrl::LLNameListCtrl(const LLNameListCtrl::Params& p)
diff --git a/indra/newview/llpanelavatar.cpp b/indra/newview/llpanelavatar.cpp
index d58a1cb663..988e801b61 100644
--- a/indra/newview/llpanelavatar.cpp
+++ b/indra/newview/llpanelavatar.cpp
@@ -66,8 +66,8 @@ public:
 		Params()
 		:	agent_id("agent_id")
 		{
-			mouse_opaque(false);
-			follows.flags(FOLLOWS_ALL);
+			changeDefault(mouse_opaque, false);
+			changeDefault(follows.flags, FOLLOWS_ALL);
 		}
 	};
 
diff --git a/indra/newview/llpanelgroupnotices.cpp b/indra/newview/llpanelgroupnotices.cpp
index e64192c2ae..31c0e3d01a 100644
--- a/indra/newview/llpanelgroupnotices.cpp
+++ b/indra/newview/llpanelgroupnotices.cpp
@@ -82,8 +82,8 @@ public:
 		:	panel("panel"),
 			group_id("group_id")
 		{
-			mouse_opaque(false);
-			follows.flags(FOLLOWS_ALL);
+			changeDefault(mouse_opaque, false);
+			changeDefault(follows.flags, FOLLOWS_ALL);
 		}
 	};
 	LLGroupDropTarget(const Params&);
diff --git a/indra/newview/llpanelmarketplaceinbox.h b/indra/newview/llpanelmarketplaceinbox.h
index 7b4ed137db..705a095cf0 100644
--- a/indra/newview/llpanelmarketplaceinbox.h
+++ b/indra/newview/llpanelmarketplaceinbox.h
@@ -37,9 +37,7 @@ class LLPanelMarketplaceInbox : public LLPanel, public LLSideTrayTabBadgeDriver
 public:
 
 	struct Params :	public LLInitParam::Block<Params, LLPanel::Params>
-	{
-		Params() {}
-	};
+	{};
 
 	LOG_CLASS(LLPanelMarketplaceInbox);
 
diff --git a/indra/newview/llpanelmarketplaceinboxinventory.h b/indra/newview/llpanelmarketplaceinboxinventory.h
index 8946b9dc98..aac2416e41 100644
--- a/indra/newview/llpanelmarketplaceinboxinventory.h
+++ b/indra/newview/llpanelmarketplaceinboxinventory.h
@@ -41,9 +41,7 @@ class LLInboxInventoryPanel : public LLInventoryPanel
 {
 public:
 	struct Params : public LLInitParam::Block<Params, LLInventoryPanel::Params>
-	{
-		Params() {}
-	};
+	{};
 	
 	LLInboxInventoryPanel(const Params& p);
 	~LLInboxInventoryPanel();
diff --git a/indra/newview/llpanelmarketplaceoutbox.h b/indra/newview/llpanelmarketplaceoutbox.h
index 8e2c35914d..e3a09bfe0d 100644
--- a/indra/newview/llpanelmarketplaceoutbox.h
+++ b/indra/newview/llpanelmarketplaceoutbox.h
@@ -40,9 +40,7 @@ class LLPanelMarketplaceOutbox : public LLPanel
 public:
 	
 	struct Params :	public LLInitParam::Block<Params, LLPanel::Params>
-	{
-		Params() {}
-	};
+	{};
 	
 	LOG_CLASS(LLPanelMarketplaceOutbox);
 
diff --git a/indra/newview/llsearchcombobox.cpp b/indra/newview/llsearchcombobox.cpp
index 6558c9a7fa..2824c70582 100644
--- a/indra/newview/llsearchcombobox.cpp
+++ b/indra/newview/llsearchcombobox.cpp
@@ -52,10 +52,9 @@ protected:
 };
 
 LLSearchComboBox::Params::Params()
-: search_button("search_button")
-, dropdown_button_visible("dropdown_button_visible", false)
-{
-}
+:	search_button("search_button"),
+	dropdown_button_visible("dropdown_button_visible", false)
+{}
 
 LLSearchComboBox::LLSearchComboBox(const Params&p)
 : LLComboBox(p)
diff --git a/indra/newview/llsidetraypanelcontainer.cpp b/indra/newview/llsidetraypanelcontainer.cpp
index 214f595772..95a12c7c23 100644
--- a/indra/newview/llsidetraypanelcontainer.cpp
+++ b/indra/newview/llsidetraypanelcontainer.cpp
@@ -32,10 +32,10 @@ static LLDefaultChildRegistry::Register<LLSideTrayPanelContainer> r2("panel_cont
 std::string LLSideTrayPanelContainer::PARAM_SUB_PANEL_NAME = "sub_panel_name";
 
 LLSideTrayPanelContainer::Params::Params()
- : default_panel_name("default_panel_name")
+:	default_panel_name("default_panel_name")
 {
 	// Always hide tabs.
-	hide_tabs(true);
+	changeDefault(hide_tabs, true);
 }
 
 LLSideTrayPanelContainer::LLSideTrayPanelContainer(const Params& p)
diff --git a/indra/newview/llspeakbutton.cpp b/indra/newview/llspeakbutton.cpp
index d3e96f8dfb..bbe573c546 100644
--- a/indra/newview/llspeakbutton.cpp
+++ b/indra/newview/llspeakbutton.cpp
@@ -47,12 +47,10 @@ static LLDefaultChildRegistry::Register<LLSpeakButton> t1("talk_button");
 //////////////////////////////////////////////////////////////////////////
 
 LLSpeakButton::Params::Params()
- : speak_button("speak_button")
- , show_button("show_button")
- , monitor("monitor")
-{
-	// See widgets/talk_button.xml
-}
+:	speak_button("speak_button"),
+	show_button("show_button"),
+	monitor("monitor")
+{}
 
 LLSpeakButton::LLSpeakButton(const Params& p)
 : LLUICtrl(p)
diff --git a/indra/newview/lltexturectrl.h b/indra/newview/lltexturectrl.h
index fdfbee400e..b1312d641f 100644
--- a/indra/newview/lltexturectrl.h
+++ b/indra/newview/lltexturectrl.h
@@ -92,11 +92,7 @@ public:
 			multiselect_text("multiselect_text"),
 			caption_text("caption_text"),
 			border("border")
-		{
-			name = "texture picker";
-			mouse_opaque(true);
-			follows.flags(FOLLOWS_LEFT | FOLLOWS_TOP);
-		}
+		{}
 	};
 protected:
 	LLTextureCtrl(const Params&);
diff --git a/indra/newview/lltextureview.cpp b/indra/newview/lltextureview.cpp
index 0115115a23..6547154bc4 100644
--- a/indra/newview/lltextureview.cpp
+++ b/indra/newview/lltextureview.cpp
@@ -94,7 +94,7 @@ public:
 		Params()
 		:	texture_view("texture_view")
 		{
-			mouse_opaque(false);
+			changeDefault(mouse_opaque, false);
 		}
 	};
 	LLTextureBar(const Params& p)
@@ -387,7 +387,7 @@ public:
 		:	texture_view("texture_view")
 		{
 			S32 line_height = (S32)(LLFontGL::getFontMonospace()->getLineHeight() + .5f);
-			rect(LLRect(0,0,100,line_height * 4));
+			changeDefault(rect, LLRect(0,0,100,line_height * 4));
 		}
 	};
 
@@ -486,7 +486,7 @@ public:
 		:	texture_view("texture_view")
 		{
 			S32 line_height = (S32)(LLFontGL::getFontMonospace()->getLineHeight() + .5f);
-			rect(LLRect(0,0,100,line_height * 4));
+			changeDefault(rect, LLRect(0,0,100,line_height * 4));
 		}
 	};
 
diff --git a/indra/newview/llviewertexteditor.h b/indra/newview/llviewertexteditor.h
index 0861dfcb20..fb428d0dc1 100644
--- a/indra/newview/llviewertexteditor.h
+++ b/indra/newview/llviewertexteditor.h
@@ -36,12 +36,7 @@ class LLViewerTextEditor : public LLTextEditor
 {
 public:
 	struct Params : public LLInitParam::Block<Params, LLTextEditor::Params>
-	{
-		Params()
-		{
-			name = "text_editor";
-		}
-	};
+	{};
 
 protected:
 	LLViewerTextEditor(const Params&);
diff --git a/indra/newview/skins/default/xui/en/widgets/badge.xml b/indra/newview/skins/default/xui/en/widgets/badge.xml
index 2d4c02b092..738d150f64 100644
--- a/indra/newview/skins/default/xui/en/widgets/badge.xml
+++ b/indra/newview/skins/default/xui/en/widgets/badge.xml
@@ -1,7 +1,8 @@
 <?xml version="1.0" encoding="utf-8" standalone="yes" ?>
 <!-- Additional attributes:
    -->
-<badge border_image="Badge_Border"
+<badge name="badge"
+       border_image="Badge_Border"
        border_color="BadgeBorderColor"
        font="SansSerifSmall"
        image="Badge_Background"
diff --git a/indra/newview/skins/default/xui/en/widgets/button.xml b/indra/newview/skins/default/xui/en/widgets/button.xml
index 302014eb24..61d36468d7 100644
--- a/indra/newview/skins/default/xui/en/widgets/button.xml
+++ b/indra/newview/skins/default/xui/en/widgets/button.xml
@@ -26,5 +26,6 @@
         height="23"
         scale_image="true"
         handle_right_mouse="true"
-        use_draw_context_alpha="true">
+        use_draw_context_alpha="true"
+        held_down_delay.seconds="0.5">
 </button>
diff --git a/indra/newview/skins/default/xui/en/widgets/color_swatch.xml b/indra/newview/skins/default/xui/en/widgets/color_swatch.xml
index 48b987d7e8..ab3de1eaab 100644
--- a/indra/newview/skins/default/xui/en/widgets/color_swatch.xml
+++ b/indra/newview/skins/default/xui/en/widgets/color_swatch.xml
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8" standalone="yes" ?>
 <color_swatch alpha_background_image="color_swatch_alpha.tga"
               border_color="ColorSwatchBorderColor"
-              name="color_swatch">
+              name="colorswatch">
   <color_swatch.caption_text name="caption"
                              halign="center"
                              follows="left|right|bottom"
diff --git a/indra/newview/skins/default/xui/en/widgets/filter_editor.xml b/indra/newview/skins/default/xui/en/widgets/filter_editor.xml
index 0720621f0b..2cc4abdd30 100644
--- a/indra/newview/skins/default/xui/en/widgets/filter_editor.xml
+++ b/indra/newview/skins/default/xui/en/widgets/filter_editor.xml
@@ -1,5 +1,6 @@
 <?xml version="1.0" encoding="utf-8" standalone="yes" ?>
 <filter_editor
+  name="filter_editor"
   clear_button_visible="true"
   search_button_visible="false"
   text_pad_left="7"
diff --git a/indra/newview/skins/default/xui/en/widgets/folder_view_item.xml b/indra/newview/skins/default/xui/en/widgets/folder_view_item.xml
index e6bdcccfdf..6fa74f403d 100644
--- a/indra/newview/skins/default/xui/en/widgets/folder_view_item.xml
+++ b/indra/newview/skins/default/xui/en/widgets/folder_view_item.xml
@@ -5,4 +5,6 @@
   item_height="20" 
   item_top_pad="4"
   selection_image="Rounded_Square"
+  mouse_opaque="true"
+  follows="left|top|right"
   />
diff --git a/indra/newview/skins/default/xui/en/widgets/layout_stack.xml b/indra/newview/skins/default/xui/en/widgets/layout_stack.xml
new file mode 100644
index 0000000000..48bcb46533
--- /dev/null
+++ b/indra/newview/skins/default/xui/en/widgets/layout_stack.xml
@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8" standalone="yes" ?>
+<!-- Global settings for all widgets ("UI Controls") -->
+<!-- The params in this file aren't currently getting loaded in OSX -->
+<layout_stack name="stack"/> 
diff --git a/indra/newview/skins/default/xui/en/widgets/menu_bar.xml b/indra/newview/skins/default/xui/en/widgets/menu_bar.xml
new file mode 100644
index 0000000000..ee3ef0cd7a
--- /dev/null
+++ b/indra/newview/skins/default/xui/en/widgets/menu_bar.xml
@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="utf-8" standalone="yes" ?>
+<menu_bar
+  			can_tear_off = "false"
+			keep_fixed_size = "true"
+			horizontal_layout = "true"
+			visible = "true"
+			drop_shadow = "false"/>
diff --git a/indra/newview/skins/default/xui/en/widgets/menu_item_separator.xml b/indra/newview/skins/default/xui/en/widgets/menu_item_separator.xml
index e5cea476da..7452d685eb 100644
--- a/indra/newview/skins/default/xui/en/widgets/menu_item_separator.xml
+++ b/indra/newview/skins/default/xui/en/widgets/menu_item_separator.xml
@@ -1,6 +1,8 @@
 <?xml version="1.0" encoding="utf-8" standalone="yes" ?>
 <menu_item_separator enabled_color="MenuItemEnabledColor"
-	disabled_color="MenuItemDisabledColor"
-	highlight_bg_color="MenuItemHighlightBgColor"
-  highlight_fg_color="MenuItemHighlightFgColor">
+                     name="separator"
+                     disabled_color="MenuItemDisabledColor"
+                     highlight_bg_color="MenuItemHighlightBgColor"
+                     highlight_fg_color="MenuItemHighlightFgColor"
+                     label="-----------">
 </menu_item_separator>
diff --git a/indra/newview/skins/default/xui/en/widgets/menu_item_tear_off.xml b/indra/newview/skins/default/xui/en/widgets/menu_item_tear_off.xml
index 185ed6ee3e..72af3924c1 100644
--- a/indra/newview/skins/default/xui/en/widgets/menu_item_tear_off.xml
+++ b/indra/newview/skins/default/xui/en/widgets/menu_item_tear_off.xml
@@ -1,7 +1,8 @@
 <?xml version="1.0" encoding="utf-8" standalone="yes" ?>
 <!-- Use "disabled color" to make it look like menu separators -->
 <menu_item_tear_off enabled_color="MenuItemDisabledColor"
-	disabled_color="MenuItemDisabledColor"
-	highlight_bg_color="MenuItemHighlightBgColor"
-  highlight_fg_color="MenuItemHighlightFgColor">
-</menu_item_tear_off>
+                    name="tear_off"
+              			label = "~~~~~~~~~~~"
+                    disabled_color="MenuItemDisabledColor"
+                    highlight_bg_color="MenuItemHighlightBgColor"
+                    highlight_fg_color="MenuItemHighlightFgColor"/>
diff --git a/indra/newview/skins/default/xui/en/widgets/multi_slider.xml b/indra/newview/skins/default/xui/en/widgets/multi_slider.xml
index e0900b48f3..90b0625982 100644
--- a/indra/newview/skins/default/xui/en/widgets/multi_slider.xml
+++ b/indra/newview/skins/default/xui/en/widgets/multi_slider.xml
@@ -1,6 +1,7 @@
 <?xml version="1.0" encoding="utf-8" standalone="yes" ?>
 <multi_slider text_color="LabelTextColor"
-                  text_disabled_color="LabelDisabledColor"
-                  draw_track="true"
-                  use_triangle="false"
-                  font="SansSerifSmall"/>
+              mouse_opaque="true"
+              text_disabled_color="LabelDisabledColor"
+              draw_track="true"
+              use_triangle="false"
+              font="SansSerifSmall"/>
diff --git a/indra/newview/skins/default/xui/en/widgets/multi_slider_bar.xml b/indra/newview/skins/default/xui/en/widgets/multi_slider_bar.xml
index 04a2cd635c..bbcb008df4 100644
--- a/indra/newview/skins/default/xui/en/widgets/multi_slider_bar.xml
+++ b/indra/newview/skins/default/xui/en/widgets/multi_slider_bar.xml
@@ -1,5 +1,6 @@
 <?xml version="1.0" encoding="utf-8" standalone="yes" ?>
-<multi_slider_bar track_color="MultiSliderTrackColor"
+<multi_slider_bar name="multi_slider_bar"
+                  track_color="MultiSliderTrackColor"
                   thumb_disabled_color="MultiSliderDisabledThumbColor"
                   thumb_outline_color="MultiSliderThumbOutlineColor"
                   thumb_center_color="MultiSliderThumbCenterColor"
@@ -7,4 +8,6 @@
                   triangle_color="MultiSliderTriangleColor"
                   draw_track="true"
                   use_triangle="false"
-                  thumb_width="8"/>
+                  thumb_width="8"
+                  mouse_opaque="true"
+                  follows="left|top"/>
diff --git a/indra/newview/skins/default/xui/en/widgets/name_list.xml b/indra/newview/skins/default/xui/en/widgets/name_list.xml
new file mode 100644
index 0000000000..3ae0f68227
--- /dev/null
+++ b/indra/newview/skins/default/xui/en/widgets/name_list.xml
@@ -0,0 +1,3 @@
+<?xml version="1.0" encoding="utf-8" standalone="yes" ?>
+<name_list name="name_list"
+           />
diff --git a/indra/newview/skins/default/xui/en/widgets/panel.xml b/indra/newview/skins/default/xui/en/widgets/panel.xml
index 47a210d9b7..b36f723831 100644
--- a/indra/newview/skins/default/xui/en/widgets/panel.xml
+++ b/indra/newview/skins/default/xui/en/widgets/panel.xml
@@ -4,7 +4,8 @@
   bg_opaque_image - image name for "in-front" panel look
   bg_alpha_image - image name for "in-back" or transparent panel look
 -->
-<panel bg_opaque_color="PanelFocusBackgroundColor"
+<panel name="panel"
+       bg_opaque_color="PanelFocusBackgroundColor"
        bg_alpha_color="PanelDefaultBackgroundColor"
        bg_opaque_image_overlay="White"
        bg_alpha_image_overlay="White"
diff --git a/indra/newview/skins/default/xui/en/widgets/scroll_bar.xml b/indra/newview/skins/default/xui/en/widgets/scroll_bar.xml
index e6d4bff8b5..682dcf40d8 100644
--- a/indra/newview/skins/default/xui/en/widgets/scroll_bar.xml
+++ b/indra/newview/skins/default/xui/en/widgets/scroll_bar.xml
@@ -5,7 +5,8 @@
 			track_image_horizontal ="ScrollTrack_Horiz"
 			track_color="ScrollbarTrackColor"
             thumb_color="ScrollbarThumbColor"
-            thickness="15">
+            thickness="15"
+            tab_stop="false">
   <up_button name="up_button"
              image_unselected="ScrollArrow_Up"
              image_selected="ScrollArrow_Up"
diff --git a/indra/newview/skins/default/xui/en/widgets/scroll_column_header.xml b/indra/newview/skins/default/xui/en/widgets/scroll_column_header.xml
index f936a1e208..8a48fcb32d 100644
--- a/indra/newview/skins/default/xui/en/widgets/scroll_column_header.xml
+++ b/indra/newview/skins/default/xui/en/widgets/scroll_column_header.xml
@@ -1,11 +1,12 @@
 <?xml version="1.0" encoding="utf-8" standalone="yes" ?>
-<scroll_column_header
-		    image_unselected="SegmentedBtn_Middle_Selected"
+<scroll_column_header name="column_header"
+                      image_unselected="SegmentedBtn_Middle_Selected"
                       image_selected="SegmentedBtn_Middle_Selected"
-		      image_pressed="SegmentedBtn_Middle_Selected_Press"
+                      image_pressed="SegmentedBtn_Middle_Selected_Press"
                       image_disabled="SegmentedBtn_Middle_Disabled"
                       image_disabled_selected="SegmentedBtn_Middle_Selected_Disabled"
                       image_overlay="DisclosureArrow_Opened_Off"
                       image_overlay_alignment="right"
                       halign="left"
+                      tab_stop="false"
                       scale_image="true" />
diff --git a/indra/newview/skins/default/xui/en/widgets/scroll_container.xml b/indra/newview/skins/default/xui/en/widgets/scroll_container.xml
index 86356ff563..70f2e88d13 100644
--- a/indra/newview/skins/default/xui/en/widgets/scroll_container.xml
+++ b/indra/newview/skins/default/xui/en/widgets/scroll_container.xml
@@ -1,5 +1,8 @@
 <?xml version="1.0" encoding="utf-8" standalone="yes" ?>
-<scroll_container color="black"
+<scroll_container name="scroll_container"
+                  color="black"
                   opaque="false"
+                  mouse_opaque="true"
+                  tab_stop="false"
                   min_auto_scroll_rate="120"
                   max_auto_scroll_rate="500"/>
diff --git a/indra/newview/skins/default/xui/en/widgets/scroll_list.xml b/indra/newview/skins/default/xui/en/widgets/scroll_list.xml
index dd93675807..e43989c6c7 100644
--- a/indra/newview/skins/default/xui/en/widgets/scroll_list.xml
+++ b/indra/newview/skins/default/xui/en/widgets/scroll_list.xml
@@ -1,5 +1,6 @@
 <?xml version="1.0" encoding="utf-8" standalone="yes" ?>
-<scroll_list fg_unselected_color="ScrollUnselectedColor"
+<scroll_list name="scroll_list" 
+             fg_unselected_color="ScrollUnselectedColor"
              fg_selected_color="ScrollSelectedFGColor"
              bg_selected_color="ScrollSelectedBGColor"
              fg_disable_color="ScrollDisabledColor"
@@ -13,6 +14,7 @@
              scroll_bar_bg_visible="false"
              scroll_bar_bg_color="black"
              mouse_wheel_opaque="false"
+             mouse_opaque="true"
              background_visible="true"
              heading_height="23"
              draw_border="false"
diff --git a/indra/newview/skins/default/xui/en/widgets/scrolling_panel_list.xml b/indra/newview/skins/default/xui/en/widgets/scrolling_panel_list.xml
new file mode 100644
index 0000000000..40cbf5977a
--- /dev/null
+++ b/indra/newview/skins/default/xui/en/widgets/scrolling_panel_list.xml
@@ -0,0 +1,2 @@
+<?xml version="1.0" encoding="utf-8" standalone="yes" ?>
+<scrolling_panel_list name="scrolling_panel_list"/>
\ No newline at end of file
diff --git a/indra/newview/skins/default/xui/en/widgets/search_editor.xml b/indra/newview/skins/default/xui/en/widgets/search_editor.xml
index 32e443a058..faa0404b35 100644
--- a/indra/newview/skins/default/xui/en/widgets/search_editor.xml
+++ b/indra/newview/skins/default/xui/en/widgets/search_editor.xml
@@ -1,5 +1,6 @@
 <?xml version="1.0" encoding="utf-8" standalone="yes" ?>
 <search_editor
+  name="search_editor"
   clear_button_visible="false"
   search_button_visible="true"
   text_pad_left="6" 
diff --git a/indra/newview/skins/default/xui/en/widgets/slider_bar.xml b/indra/newview/skins/default/xui/en/widgets/slider_bar.xml
index ea63cac790..0335213ed6 100644
--- a/indra/newview/skins/default/xui/en/widgets/slider_bar.xml
+++ b/indra/newview/skins/default/xui/en/widgets/slider_bar.xml
@@ -1,6 +1,7 @@
 <?xml version="1.0" encoding="utf-8" standalone="yes" ?>
 <!--All horizontal sliders are configured to have no highlighted track. See EXT-5939. -->
-<slider_bar track_color="SliderTrackColor"
+<slider_bar follows="left|top"
+            track_color="SliderTrackColor"
             thumb_outline_color="SliderThumbOutlineColor"
             thumb_center_color="SliderThumbCenterColor"
             thumb_image="SliderThumb_Off"
diff --git a/indra/newview/skins/default/xui/en/widgets/tab_container.xml b/indra/newview/skins/default/xui/en/widgets/tab_container.xml
index c37ead0be2..3e2202b20f 100644
--- a/indra/newview/skins/default/xui/en/widgets/tab_container.xml
+++ b/indra/newview/skins/default/xui/en/widgets/tab_container.xml
@@ -3,7 +3,9 @@
 label_pad_bottom - vertical padding under tab button labels
 label_pad_left - padding to the left of tab button labels
 -->
-<tab_container tab_min_width="60"
+<tab_container name="tab_container" 
+               mouse_opaque="false"
+               tab_min_width="60"
                tab_max_width="150"
                use_custom_icon_ctrl="false"
                halign="center"
diff --git a/indra/newview/skins/default/xui/en/widgets/text_editor.xml b/indra/newview/skins/default/xui/en/widgets/text_editor.xml
index 0f7f50b312..100571cc01 100644
--- a/indra/newview/skins/default/xui/en/widgets/text_editor.xml
+++ b/indra/newview/skins/default/xui/en/widgets/text_editor.xml
@@ -1,5 +1,6 @@
 <?xml version="1.0" encoding="utf-8" standalone="yes" ?>
 <!-- Core parameters are in simple_text_editor.xml -->
 <text_editor
+  name="text_editor"
   parse_urls="false"
   show_context_menu="true"/>
diff --git a/indra/newview/skins/default/xui/en/widgets/texture_picker.xml b/indra/newview/skins/default/xui/en/widgets/texture_picker.xml
index 757f0f49d1..ba2fdf4f1f 100644
--- a/indra/newview/skins/default/xui/en/widgets/texture_picker.xml
+++ b/indra/newview/skins/default/xui/en/widgets/texture_picker.xml
@@ -1,5 +1,9 @@
 <?xml version="1.0" encoding="utf-8" standalone="yes" ?>
-<texture_picker border_color="DefaultHighlightLight">
+<texture_picker border_color="DefaultHighlightLight"
+                name="texture picker"
+                mouse_opaque="true"
+                follows="left|top"
+                >
   <multiselect_text font="SansSerifSmall"/>
   <caption_text text="Multiple" 
                 halign="center" 
diff --git a/indra/newview/skins/default/xui/en/widgets/view_border.xml b/indra/newview/skins/default/xui/en/widgets/view_border.xml
index 0b0a9beb95..bf40e3086b 100644
--- a/indra/newview/skins/default/xui/en/widgets/view_border.xml
+++ b/indra/newview/skins/default/xui/en/widgets/view_border.xml
@@ -1,8 +1,11 @@
 <?xml version="1.0" encoding="utf-8" standalone="yes" ?>
-<view_border highlight_light_color="DefaultHighlightLight"
+<view_border name="view_border" 
+             highlight_light_color="DefaultHighlightLight"
              highlight_dark_color="DefaultHighlightDark"
              shadow_light_color="DefaultShadowLight"
              shadow_dark_color="DefaultShadowDark"
              border_thickness="1"
              border_style="line"
-             bevel_style="out"/>
\ No newline at end of file
+             bevel_style="out"
+             mouse_opaque="false"
+             follows="all"/>
\ No newline at end of file
diff --git a/indra/newview/skins/default/xui/en/widgets/web_browser.xml b/indra/newview/skins/default/xui/en/widgets/web_browser.xml
index 118d63bbf0..676fafd828 100644
--- a/indra/newview/skins/default/xui/en/widgets/web_browser.xml
+++ b/indra/newview/skins/default/xui/en/widgets/web_browser.xml
@@ -1,2 +1,4 @@
 <?xml version="1.0" encoding="utf-8" standalone="yes" ?>
-<web_browser border_visible="true"/>
+<web_browser border_visible="true"
+             tab_stop="false"
+             />