X-Git-Url: http://git.tdb.fi/?p=libs%2Fgltk.git;a=blobdiff_plain;f=source%2Flayout.cpp;h=b4cd7683c6bc60d2b615c7c46323b773e4a668cf;hp=f89e407cf7f4d3b61d08831c0f71693b68b27760;hb=c90e083d1b6c9ce754765a38bf2c14de89993ed5;hpb=76a7cd9ed443c1a6451e6fab98f428f7cce48eed

diff --git a/source/layout.cpp b/source/layout.cpp
index f89e407..b4cd768 100644
--- a/source/layout.cpp
+++ b/source/layout.cpp
@@ -1,5 +1,8 @@
 #include <algorithm>
 #include <limits>
+#include <msp/core/maputils.h>
+#include <msp/strings/format.h>
+#include "arrangement.h"
 #include "container.h"
 #include "layout.h"
 #include "widget.h"
@@ -84,10 +87,14 @@ Layout::Pointers Layout::pointers[2] =
 
 Layout::Layout():
 	container(0),
+	n_active_slots(0),
 	margin(8),
 	row_spacing(5),
 	col_spacing(4)
-{ }
+{
+	n_slack_vars[0] = 0;
+	n_slack_vars[1] = 0;
+}
 
 Layout::~Layout()
 {
@@ -110,16 +117,67 @@ void Layout::set_margin(const Sides &m)
 		update();
 }
 
+void Layout::set_spacing(unsigned s)
+{
+	row_spacing = s;
+	col_spacing = s;
+	if(container)
+		update();
+}
+
+void Layout::set_row_spacing(unsigned s)
+{
+	row_spacing = s;
+	if(container)
+		update();
+}
+
+void Layout::set_column_spacing(unsigned s)
+{
+	col_spacing = s;
+	if(container)
+		update();
+}
+
+void Layout::push_arrangement(Arrangement &arr)
+{
+	arrangement_stack.push_back(&arr);
+}
+
+Arrangement *Layout::get_arrangement() const
+{
+	if(arrangement_stack.empty())
+		return 0;
+	else
+		return arrangement_stack.back();
+}
+
+void Layout::pop_arrangement(Arrangement &arr)
+{
+	list<Arrangement *>::iterator begin = find(arrangement_stack.begin(), arrangement_stack.end(), &arr);
+	if(begin==arrangement_stack.end())
+		return;
+
+	while(1)
+	{
+		Arrangement *top = arrangement_stack.back();
+		arrangement_stack.pop_back();
+		if(!arrangement_stack.empty())
+			arrangement_stack.back()->arrange(*top);
+		if(top==&arr)
+			break;
+	}
+}
+
 void Layout::add_widget(Widget &wdg)
 {
 	if(!container)
 		throw logic_error("!container");
 
-	Slot *slot = create_slot(wdg);
-	for(list<Constraint>::iterator i=slot->constraints.begin(); i!=slot->constraints.end(); ++i)
-		i->target.constraints.push_back(Constraint(complement(i->type), *slot));
-	slot->index = slots.size();
-	slots.push_back(slot);
+	slots.push_back(new Slot(*this, wdg));
+	update_slot_indices();
+	if(!arrangement_stack.empty())
+		arrangement_stack.back()->arrange(wdg);
 	if(container)
 		update();
 }
@@ -144,18 +202,44 @@ void Layout::remove_widget(Widget &wdg)
 			delete *i;
 			slots.erase(i);
 
-			unsigned n = 0;
-			for(i=slots.begin(); i!=slots.end(); ++i, ++n)
-				(*i)->index = n;
-
+			update_slot_indices();
 			update();
 			return;
 		}
 }
 
-Layout::Slot *Layout::create_slot(Widget &wdg)
+void Layout::update_slot_indices()
 {
-	return new Slot(*this, wdg);
+	n_active_slots = 0;
+	unsigned n_floating = 0;
+	for(list<Slot *>::iterator i=slots.begin(); i!=slots.end(); ++i)
+	{
+		if((*i)->widget.is_visible() || (*i)->ghost)
+		{
+			(*i)->index = n_active_slots++;
+			if((*i)->floating)
+				++n_floating;
+		}
+		else
+			(*i)->index = -1;
+	}
+
+	n_slack_vars[0] = n_floating*2;
+	n_slack_vars[1] = n_floating*2;
+	for(list<Slot *>::iterator i=slots.begin(); i!=slots.end(); ++i)
+		if((*i)->index>=0)
+		{
+			if(!(*i)->floating)
+			{
+				for(unsigned j=0; j<2; ++j)
+					if(((*i)->*(pointers[j].packing)).gravity==0)
+						n_slack_vars[j] += 2;
+			}
+
+			for(list<Constraint>::iterator j=(*i)->constraints.begin(); j!=(*i)->constraints.end(); ++j)
+				if(j->target.index>(*i)->index && (j->type&SLACK))
+					++n_slack_vars[j->type&1];
+		}
 }
 
 Layout::Slot &Layout::get_slot_for_widget(Widget &wdg)
@@ -169,22 +253,13 @@ Layout::Slot &Layout::get_slot_for_widget(Widget &wdg)
 
 Layout::ConstraintType Layout::complement(ConstraintType type)
 {
-	if(type==RIGHT_OF)
-		return LEFT_OF;
-	else if(type==LEFT_OF)
-		return RIGHT_OF;
-	else if(type==ABOVE)
-		return BELOW;
-	else if(type==BELOW)
-		return ABOVE;
-	else
-		return type;
+	return static_cast<ConstraintType>((type&~(SELF_MASK|TARGET_MASK)) | ((type&SELF_MASK)<<2) | ((type&TARGET_MASK)>>2));
 }
 
-void Layout::add_constraint(Widget &src, ConstraintType type, Widget &tgt)
+void Layout::create_constraint(Widget &src, ConstraintType type, Widget &tgt, int sp)
 {
 	if(&src==&tgt)
-		throw invalid_argument("&src==&tgt");
+		throw invalid_argument("Layout::create_constraint");
 
 	Slot &src_slot = get_slot_for_widget(src);
 	Slot &tgt_slot = get_slot_for_widget(tgt);
@@ -194,11 +269,24 @@ void Layout::add_constraint(Widget &src, ConstraintType type, Widget &tgt)
 			return;
 
 	src_slot.constraints.push_back(Constraint(type, tgt_slot));
+	src_slot.constraints.back().spacing = sp;
 	tgt_slot.constraints.push_back(Constraint(complement(type), src_slot));
+	tgt_slot.constraints.back().spacing = sp;
 
+	update_slot_indices();
 	update();
 }
 
+void Layout::add_constraint(Widget &src, ConstraintType type, Widget &tgt)
+{
+	create_constraint(src, type, tgt, -1);
+}
+
+void Layout::add_constraint(Widget &src, ConstraintType type, Widget &tgt, unsigned spacing)
+{
+	create_constraint(src, type, tgt, spacing);
+}
+
 void Layout::set_gravity(Widget &wdg, int h, int v)
 {
 	Slot &slot = get_slot_for_widget(wdg);
@@ -206,6 +294,7 @@ void Layout::set_gravity(Widget &wdg, int h, int v)
 	slot.horiz_pack.gravity = h;
 	slot.vert_pack.gravity = v;
 
+	update_slot_indices();
 	update();
 }
 
@@ -219,33 +308,79 @@ void Layout::set_expand(Widget &wdg, bool h, bool v)
 	update();
 }
 
+void Layout::set_ghost(Widget &wdg, bool g)
+{
+	Slot &slot = get_slot_for_widget(wdg);
+
+	slot.ghost = g;
+
+	if(!wdg.is_visible())
+	{
+		update_slot_indices();
+		update();
+	}
+}
+
+void Layout::set_floating(Widget &wdg, bool f)
+{
+	Slot &slot = get_slot_for_widget(wdg);
+
+	slot.floating = f;
+
+	update_slot_indices();
+	update();
+}
+
 void Layout::update()
 {
-	solve_constraints(HORIZONTAL);
-	solve_constraints(VERTICAL);
+	solve_constraints(HORIZONTAL, UPDATE);
+	solve_constraints(VERTICAL, UPDATE);
 
 	for(list<Slot *>::iterator i=slots.begin(); i!=slots.end(); ++i)
 		(*i)->widget.set_geometry((*i)->geom);
 }
 
-void Layout::solve_constraints(int dir)
+void Layout::autosize(Geometry &geom)
+{
+	solve_constraints(HORIZONTAL, AUTOSIZE);
+	solve_constraints(VERTICAL, AUTOSIZE);
+
+	geom.w = max(geom.w, autosize_geom.w);
+	geom.h = max(geom.h, autosize_geom.h);
+}
+
+void Layout::solve_constraints(int dir, SolveMode mode)
 {
 	Pointers &ptrs = pointers[dir&VERTICAL];
 
 	const Geometry &geom = container->get_geometry();
-	if(geom.*(ptrs.dim)<margin.*(ptrs.low_margin)+margin.*(ptrs.high_margin))
+	if(mode==UPDATE && geom.*(ptrs.dim)<margin.*(ptrs.low_margin)+margin.*(ptrs.high_margin))
 		return;
 
 	/* Set up a linear program to solve the constraints.  The program matrix has
 	five columns for each widget, and one constant column.  The first and second
 	columns of a widget are its position and dimension, respectively.  The
 	remaining three are slack columns; see below for their purposes. */
-	LinearProgram linprog(slots.size()*5+1);
+	LinearProgram linprog(n_active_slots*5+n_slack_vars[dir]+1);
 	float weight = slots.size();
+	unsigned k = n_active_slots*5;
 	for(list<Slot *>::iterator i=slots.begin(); i!=slots.end(); ++i)
 	{
-		linprog.get_objective_row()[(*i)->index*5] = ((*i)->*(ptrs.packing)).gravity/weight;
-		linprog.get_objective_row()[(*i)->index*5+1] = (((*i)->*(ptrs.packing)).expand ? weight : -1);
+		if((*i)->index<0)
+			continue;
+
+		LinearProgram::Row objective = linprog.get_objective_row();
+		if(mode==AUTOSIZE)
+		{
+			objective[(*i)->index*5] = -1;
+			objective[(*i)->index*5+1] = -1;
+		}
+		else
+		{
+			if(!(*i)->floating)
+				objective[(*i)->index*5] = ((*i)->*(ptrs.packing)).gravity/weight;
+			objective[(*i)->index*5+1] = (((*i)->*(ptrs.packing)).expand ? weight : -1);
+		}
 
 		{
 			// Prevent the widget from going past the container's low edge.
@@ -255,6 +390,7 @@ void Layout::solve_constraints(int dir)
 			row.back() = margin.*(ptrs.low_margin);
 		}
 
+		if(mode==UPDATE)
 		{
 			// Prevent the widget from going past the container's high edge.
 			LinearProgram::Row row = linprog.add_row();
@@ -264,49 +400,89 @@ void Layout::solve_constraints(int dir)
 			row.back() = geom.*(ptrs.dim)-margin.*(ptrs.high_margin);
 		}
 
+		if((*i)->floating || ((*i)->*(ptrs.packing)).gravity==0)
 		{
-			/* Only allow the widget's dimension to increase.  The geometry has
-			previously been set to the smallest allowable size. */
+			/* Try to keep the widget as close to a target position as possible.
+			Since linear programs can't express absolute values directly, use two
+			opposing slack variables that are optimized for a low value. */
+			float a = ((*i)->*(ptrs.packing)).gravity*0.5+0.5;
+			LinearProgram::Row row = linprog.add_row();
+			row[(*i)->index*5] = 1;
+			row[(*i)->index*5+1] = a;
+			row[k] = 1;
+			row[k+1] = -1;
+			if((*i)->floating)
+			{
+				const Geometry &cgeom = (*i)->widget.get_geometry();
+				row.back() = cgeom.*(ptrs.pos)+cgeom.*(ptrs.dim)*a;
+			}
+			else
+				row.back() = geom.*(ptrs.dim)/2;
+			objective[k] = -1;
+			objective[k+1] = -1;
+			k += 2;
+		}
+
+		{
+			/* Don't allow the widget's dimension to get below that determined
+			by autosizing. */
 			LinearProgram::Row row = linprog.add_row();
 			row[(*i)->index*5+1] = 1;
 			row[(*i)->index*5+4] = -1;
 			row.back() = (*i)->autosize_geom.*(ptrs.dim);
 		}
 
-		/* Add rows for user-defined constraints.  Below/above and left/right of
-		constraints are always added in pairs, so it's only necessary to create a
-		row for one half. */
+		/* Add rows for user-defined constraints.  Constraints are always added
+		in pairs, so it's only necessary to create a row for one half. */
 		for(list<Constraint>::iterator j=(*i)->constraints.begin(); j!=(*i)->constraints.end(); ++j)
-			if((j->type&1)==dir && j->type!=BELOW && j->type!=LEFT_OF)
+			if(j->target.index>(*i)->index && (j->type&1)==dir)
 			{
 				LinearProgram::Row row = linprog.add_row();
+				float polarity = ((j->type&SELF_DIM) ? -1 : 1);
 				if(j->type&SELF_POS)
-					row[(*i)->index*5] = 1;
+					row[(*i)->index*5] = polarity;
 				if(j->type&SELF_DIM)
-					row[(*i)->index*5+1] = 1;
+					row[(*i)->index*5+1] = polarity;
 				if(j->type&TARGET_POS)
-					row[j->target.index*5] = -1;
+					row[j->target.index*5] = -polarity;
 				if(j->type&TARGET_DIM)
-					row[j->target.index*5+1] = -1;
+					row[j->target.index*5+1] = -polarity;
 				if(j->type&SPACING)
-					row.back() = this->*(ptrs.spacing);
+					row.back() = (j->spacing>=0 ? j->spacing : this->*(ptrs.spacing));
+				if(j->type&SLACK)
+					row[k++] = -1;
 			}
 	}
 
 	if(!linprog.solve())
 		return;
 
-	for(list<Slot *>::iterator i=slots.begin(); i!=slots.end(); ++i)
+	if(mode==AUTOSIZE)
 	{
-		(*i)->geom.*(ptrs.pos) = linprog.get_variable((*i)->index*5);
-		(*i)->geom.*(ptrs.dim) = linprog.get_variable((*i)->index*5+1);
+		autosize_geom.*(ptrs.dim) = 0;
+		for(list<Slot *>::iterator i=slots.begin(); i!=slots.end(); ++i)
+			if((*i)->index>=0)
+			{
+				int high_edge = linprog.get_variable((*i)->index*5)+linprog.get_variable((*i)->index*5+1);
+				autosize_geom.*(ptrs.dim) = max(autosize_geom.*(ptrs.dim), high_edge+margin.*(ptrs.high_margin));
+			}
+	}
+	else
+	{
+		for(list<Slot *>::iterator i=slots.begin(); i!=slots.end(); ++i)
+			if((*i)->index>=0)
+			{
+				(*i)->geom.*(ptrs.pos) = linprog.get_variable((*i)->index*5);
+				(*i)->geom.*(ptrs.dim) = linprog.get_variable((*i)->index*5+1);
+			}
 	}
 }
 
 
 Layout::Constraint::Constraint(ConstraintType t, Slot &s):
 	type(t),
-	target(s)
+	target(s),
+	spacing(-1)
 { }
 
 
@@ -319,24 +495,149 @@ Layout::Packing::Packing():
 Layout::Slot::Slot(Layout &l, Widget &w):
 	layout(l),
 	index(0),
-	widget(w)
+	widget(w),
+	ghost(false),
+	floating(false)
 {
 	vert_pack.gravity = 1;
 	widget.signal_autosize_changed.connect(sigc::mem_fun(this, &Slot::autosize_changed));
-	widget.autosize();
-	autosize_geom = widget.get_geometry();
+	widget.signal_visibility_changed.connect(sigc::mem_fun(this, &Slot::visibility_changed));
+	widget.autosize(autosize_geom);
 }
 
 void Layout::Slot::autosize_changed()
 {
-	widget.autosize();
-	autosize_geom = widget.get_geometry();
+	widget.autosize(autosize_geom);
 
-	// If the widget fits in the area it had, just leave it there.
-	if(autosize_geom.w<=geom.w && autosize_geom.h<=geom.h)
-		widget.set_geometry(geom);
-	else
+	if(!widget.is_visible() && !ghost)
+		return;
+
+	// Only trigger an update if the widget won't fit in its current area.
+	if(autosize_geom.w>geom.w || autosize_geom.h>geom.h)
+	{
+		layout.container->signal_autosize_changed.emit();
+		layout.update();
+	}
+}
+
+void Layout::Slot::visibility_changed(bool v)
+{
+	layout.update_slot_indices();
+	if(v || ghost)
+	{
+		layout.container->signal_autosize_changed.emit();
 		layout.update();
+	}
+}
+
+
+Layout::Loader::Loader(Layout &l, const WidgetMap &wm):
+	DataFile::ObjectLoader<Layout>(l),
+	wdg_map(wm)
+{
+	add("column_spacing", &Loader::column_spacing);
+	add("margin",         &Loader::margin);
+	add("row_spacing",    &Loader::row_spacing);
+	add("spacing",        &Loader::spacing);
+	add("widget",         &Loader::widget);
+}
+
+void Layout::Loader::column_spacing(unsigned s)
+{
+	obj.set_column_spacing(s);
+}
+
+void Layout::Loader::margin()
+{
+	Sides sides;
+	load_sub(sides);
+	obj.set_margin(sides);
+}
+
+void Layout::Loader::spacing(unsigned s)
+{
+	obj.set_spacing(s);
+}
+
+void Layout::Loader::row_spacing(unsigned s)
+{
+	obj.set_row_spacing(s);
+}
+
+void Layout::Loader::widget(const string &n)
+{
+	Widget &wdg = *get_item(wdg_map, n);
+	WidgetLoader ldr(obj, wdg, wdg_map);
+	load_sub_with(ldr);
+}
+
+
+Layout::WidgetLoader::WidgetLoader(Layout &l, Widget &w, const Layout::Loader::WidgetMap &wm):
+	layout(l),
+	widget(w),
+	wdg_map(wm)
+{
+	add("constraint", &WidgetLoader::constraint);
+	add("expand",     &WidgetLoader::expand);
+	add("ghost",      &WidgetLoader::ghost);
+	add("gravity",    &WidgetLoader::gravity);
+}
+
+void Layout::WidgetLoader::constraint(ConstraintType type, const string &n)
+{
+	Widget &target = *get_item(wdg_map, n);
+	layout.add_constraint(widget, type, target);
+}
+
+void Layout::WidgetLoader::expand(bool h, bool v)
+{
+	layout.set_expand(widget, h, v);
+}
+
+void Layout::WidgetLoader::ghost(bool g)
+{
+	layout.set_ghost(widget, g);
+}
+
+void Layout::WidgetLoader::gravity(int h, int v)
+{
+	layout.set_gravity(widget, h, v);
+}
+
+
+void operator>>(const LexicalConverter &conv, Layout::ConstraintType &ctype)
+{
+	const string &str = conv.get();
+	if(str=="ABOVE")
+		ctype = Layout::ABOVE;
+	else if(str=="BELOW")
+		ctype = Layout::BELOW;
+	else if(str=="RIGHT_OF")
+		ctype = Layout::RIGHT_OF;
+	else if(str=="LEFT_OF")
+		ctype = Layout::LEFT_OF;
+	else if(str=="FAR_ABOVE")
+		ctype = Layout::FAR_ABOVE;
+	else if(str=="FAR_BELOW")
+		ctype = Layout::FAR_BELOW;
+	else if(str=="FAR_RIGHT_OF")
+		ctype = Layout::FAR_RIGHT_OF;
+	else if(str=="FAR_LEFT_OF")
+		ctype = Layout::FAR_LEFT_OF;
+	else if(str=="ALIGN_TOP")
+		ctype = Layout::ALIGN_TOP;
+	else if(str=="ALIGN_BOTTOM")
+		ctype = Layout::ALIGN_BOTTOM;
+	else if(str=="ALIGN_RIGHT")
+		ctype = Layout::ALIGN_RIGHT;
+	else if(str=="ALIGN_LEFT")
+		ctype = Layout::ALIGN_LEFT;
+	else if(str=="COPY_WIDTH")
+		ctype = Layout::COPY_WIDTH;
+	else if(str=="COPY_HEIGHT")
+		ctype = Layout::COPY_HEIGHT;
+	else
+		throw lexical_error(format("conversion of '%s' to ConstraintType", str));
 }
 
 
@@ -419,11 +720,12 @@ void Layout::LinearProgram::prepare_columns()
 	/* See if any variables are already basic.  A basic variable must only have
 	a nonzero coefficient on one row, and its product with the constant column
 	must not be negative.  Only one variable can be basic for any given row. */
-	vector<float> basic_coeff(n_rows, 0.0f);
+	vector<float> obj_coeff(n_rows, 0.0f);
+	vector<float> row_coeff(n_rows, 1.0f);
 	const vector<float> &constants = columns.back().values;
 	for(vector<Column>::iterator i=columns.begin(); i!=columns.end(); ++i)
 	{
-		if(i->values.size()>=2 && i->values.back()!=0.0f && (constants.size()<i->values.size() || i->values.back()*constants[i->values.size()-1]>=0.0f) && basic_coeff[i->values.size()-1]==0.0f)
+		if(i->values.size()>=2 && i->values.back()!=0.0f && (constants.size()<i->values.size() || i->values.back()*constants[i->values.size()-1]>=0.0f) && obj_coeff[i->values.size()-1]==0.0f)
 		{
 			bool basic = true;
 			for(unsigned j=1; (basic && j+1<i->values.size()); ++j)
@@ -431,7 +733,8 @@ void Layout::LinearProgram::prepare_columns()
 			if(basic)
 			{
 				i->basic = i->values.size()-1;
-				basic_coeff[i->basic] = -i->values.front()/i->values.back();
+				row_coeff[i->basic] = 1.0f/i->values.back();
+				obj_coeff[i->basic] = -i->values.front();
 				i->values.clear();
 			}
 		}
@@ -442,7 +745,10 @@ void Layout::LinearProgram::prepare_columns()
 		if(!i->values.empty())
 		{
 			for(unsigned j=0; j<i->values.size(); ++j)
-				i->values.front() += basic_coeff[j]*i->values[j];
+			{
+				i->values[j] *= row_coeff[j];
+				i->values.front() += obj_coeff[j]*i->values[j];
+			}
 		}
 }