From c1d5c719f82283739029be03d20bbf04406ff4d6 Mon Sep 17 00:00:00 2001
From: Christoph Egger <christoph@christoph-egger.org>
Date: Mon, 25 May 2015 13:37:26 +0200
Subject: [PATCH] Lazy layout CFGs

Wait for the Widget to actually be shown before starting to
layout. Good candidate for a background-worker-thread later!
---
 src/gui/widgets/FunctionWidget.cxx | 57 ++++++++++++++++--------------
 src/gui/widgets/FunctionWidget.hxx |  4 ++-
 2 files changed, 33 insertions(+), 28 deletions(-)

diff --git a/src/gui/widgets/FunctionWidget.cxx b/src/gui/widgets/FunctionWidget.cxx
index 17b539f..c9c28d1 100644
--- a/src/gui/widgets/FunctionWidget.cxx
+++ b/src/gui/widgets/FunctionWidget.cxx
@@ -18,42 +18,45 @@ namespace {
 FunctionWidget::FunctionWidget(Function* function, Mainwindow* mainwindow)
 	: function(function)
 	, mainwindow(mainwindow)
+	, layouted(false)
 	, logger(log4cxx::Logger::getLogger("gui.Mainwindow")) {
 
-	// CFG
-	CFGScene * scene = new CFGScene;
-	InformationManager* manager = function->getManager();
-
-	BasicBlock * block = manager->getBasicBlock(function->getStartAddress());
-	LOG4CXX_DEBUG(logger, "Building widget for functionction " << function->getName());
-	for (auto i : function->blocks()) {
-		LOG4CXX_DEBUG(logger, "Functionction contains Block " << i.second->getName());
-	}
-
-	uint64_t start_address(std::numeric_limits<uint64_t>::max());
-	for (auto b : function->blocks()) {
-		if (b.first < start_address)
-			start_address = b.first;
-	}
+}
 
-	std::map<uint64_t, BasicBlockWidget*> _blocks;
-	local__add_basic_block(block, mainwindow,
-	                       manager, _blocks, scene, 3*start_address, 100);
+void FunctionWidget::showEvent(QShowEvent* event) {
+	if (!layouted) {
+		CFGScene * scene = new CFGScene;
+		InformationManager* manager = function->getManager();
 
-	QGraphicsView * view = new QGraphicsView(scene);
-	view->setDragMode(QGraphicsView::ScrollHandDrag);
-	addTab(view, "CFG");
+		BasicBlock * block = manager->getBasicBlock(function->getStartAddress());
+		LOG4CXX_DEBUG(logger, "Building widget for functionction " << function->getName());
+		for (auto i : function->blocks()) {
+			LOG4CXX_DEBUG(logger, "Functionction contains Block " << i.second->getName());
+		}
 
-	// Listing
-	QTableWidget * t = new QTableWidget();
-	t->setColumnCount(3);
-	t->horizontalHeader()->setSectionResizeMode(QHeaderView::ResizeToContents);
+		uint64_t start_address(std::numeric_limits<uint64_t>::max());
+		for (auto b : function->blocks()) {
+			if (b.first < start_address)
+				start_address = b.first;
+		}
 
-	addTab(t, "Listing");
-}
+		std::map<uint64_t, BasicBlockWidget*> _blocks;
+		local__add_basic_block(block, mainwindow,
+		                       manager, _blocks, scene, 3*start_address, 100);
 
+		QGraphicsView * view = new QGraphicsView(scene);
+		view->setDragMode(QGraphicsView::ScrollHandDrag);
+		addTab(view, "CFG");
 
+		// Listing
+		QTableWidget * t = new QTableWidget();
+		t->setColumnCount(3);
+		t->horizontalHeader()->setSectionResizeMode(QHeaderView::ResizeToContents);
 
+		addTab(t, "Listing");
+		layouted = true;
+	}
+}
 
 namespace {
 	BasicBlockWidget *
diff --git a/src/gui/widgets/FunctionWidget.hxx b/src/gui/widgets/FunctionWidget.hxx
index 8400df8..6976d73 100644
--- a/src/gui/widgets/FunctionWidget.hxx
+++ b/src/gui/widgets/FunctionWidget.hxx
@@ -16,10 +16,12 @@ public:
 
 	Function* getFunction() const
 		{ return function; }
-
+protected:
+	void showEvent(QShowEvent * event);
 private:
 	Function * function;
 	Mainwindow* mainwindow;
+	bool layouted;
 
 	log4cxx::LoggerPtr logger;
 };
-- 
2.39.5