From 2413b21baf332133a3aeb0a45bc934d9feafb85d Mon Sep 17 00:00:00 2001
From: Stijn Buys <ingar@osirion.org>
Date: Thu, 23 Feb 2012 21:47:29 +0000
Subject: Prevent the map from freezing by not drawing or updating if it
 becomes smaller than 16x16 pixels.

---
 src/mainwindow.cc | 25 ++++++++++++++++---------
 src/mapwidget.cc  | 10 ++++++++--
 2 files changed, 24 insertions(+), 11 deletions(-)

diff --git a/src/mainwindow.cc b/src/mainwindow.cc
index 4c79fd7..260a630 100644
--- a/src/mainwindow.cc
+++ b/src/mainwindow.cc
@@ -105,16 +105,16 @@ EditorWindow *MainWindow::add_child()
 {
 	// create a child widget
 	EditorWindow *child_widget = new EditorWindow();
-
+	
 	// add the widget to the MDI area,
 	// this will wrap an QMdiSubWindow around it
 	QMdiSubWindow *subwindow = mainwindow_mdiarea->addSubWindow(child_widget);
+	subwindow->resize(768, 512);
 	
 	child_widget->show();
 	// FIXME check if maximized
-	subwindow->resize(768, 512);
 	
-	mainwindow_mdiarea->setActiveSubWindow(subwindow);
+	
 	return child_widget;
 }
 
@@ -134,11 +134,17 @@ void MainWindow::slot_open()
 			mainwindow_mdiarea->setActiveSubWindow(subwindow);
 		} else {
 			EditorWindow *editorwindow = add_child();
-			editorwindow->loadFile(filename);
-		
+						
+			if (!editorwindow->loadFile(filename)) {
+				subwindow = find_child(filename);
+				subwindow->close();
+				return;
+			}
+			
 			subwindow = find_child(filename);
 			if (subwindow) {
-				subwindow->setWindowTitle(editorwindow->filename());
+				subwindow->setWindowTitle(filename);
+				mainwindow_mdiarea->setActiveSubWindow(subwindow);
 			}
 		}
 	}
@@ -151,11 +157,12 @@ void MainWindow::slot_save_as()
 		QString filename = QFileDialog::getSaveFileName(this, tr("Save as..."));
 		
 		if (!filename.isEmpty()) {
-			editorwindow->saveFile(filename);
+			if (!editorwindow->saveFile(filename))
+				return;
 			
 			QMdiSubWindow *subwindow = find_child(filename);
 			if (subwindow) {
-				subwindow->setWindowTitle(editorwindow->filename());
+				subwindow->setWindowTitle(filename);
 			}
 		}
 	}
@@ -165,7 +172,7 @@ void MainWindow::slot_save()
 {
 	/*
 	if (active_child()) {
-		if (!active_child()->filename().size()) {
+		if (active_child()->filename().isEmpty()) {
 			slot_save_as();
 			return;
 		} else {
diff --git a/src/mapwidget.cc b/src/mapwidget.cc
index b855040..d2c5676 100644
--- a/src/mapwidget.cc
+++ b/src/mapwidget.cc
@@ -31,6 +31,8 @@ MapWidget::MapWidget(QWidget *parent) : QWidget(parent)
 	dragstart_x = 0;
 	dragstart_y = 0;
 	
+	is_dragging = false;
+	
 	setFocusPolicy(Qt::ClickFocus);
 }
 
@@ -97,6 +99,9 @@ void MapWidget::mouseMoveEvent(QMouseEvent *event)
 
 void MapWidget::resizeChildren()
 {
+	if ((width() < 16) || (height() < 16))
+		return;
+	
 	const float scale = (float) width() / (float) (mapwidget_zoom * 256);
 	
 	for (int i = 0; i < mapwidget_enties.size(); ++i) {
@@ -178,6 +183,9 @@ void MapWidget::resizeEvent(QResizeEvent *event)
 
 void MapWidget::paintEvent(QPaintEvent *event)
 {
+	if ((width() < 16) || (height() < 16))
+		return;
+
 	const QColor gridlinecolor(0, 0, 128);
 	const QColor axislinecolor(128, 0, 0);
 	
@@ -229,8 +237,6 @@ void MapWidget::paintEvent(QPaintEvent *event)
 		painter.drawLine(0, y, width(), y);
 		y += gridsize;
 	}
-
-	QWidget::paintEvent(event);
 }
 
 EntityWidget *MapWidget::addEntity()
-- 
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