X-Git-Url: https://sigrok.org/gitweb/?p=pulseview.git;a=blobdiff_plain;f=pv%2Fview%2Fview.cpp;h=5959ff7b3f94f1288e2c02187a47b802da091704;hp=9751f008df79f75cee62bfeadc77d9c48111ce96;hb=6644424f1ea61ee7e1f048bfac09acd4a094feab;hpb=f420385094dc7392e6bcec494d800f1d4b34f082

diff --git a/pv/view/view.cpp b/pv/view/view.cpp
index 9751f008..5959ff7b 100644
--- a/pv/view/view.cpp
+++ b/pv/view/view.cpp
@@ -14,8 +14,7 @@
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
+ * along with this program; if not, see <http://www.gnu.org/licenses/>.
  */
 
 #ifdef ENABLE_DECODE
@@ -156,7 +155,9 @@ View::View(Session &session, QWidget *parent) :
 	next_flag_text_('A'),
 	trigger_markers_(),
 	hover_point_(-1, -1),
-	scroll_needs_defaults(false)
+	scroll_needs_defaults_(false),
+	saved_v_offset_(0),
+	size_finalized_(false)
 {
 	connect(scrollarea_.horizontalScrollBar(), SIGNAL(valueChanged(int)),
 		this, SLOT(h_scroll_value_changed(int)));
@@ -281,6 +282,8 @@ const Viewport* View::viewport() const
 void View::save_settings(QSettings &settings) const
 {
 	settings.setValue("scale", scale_);
+	settings.setValue("v_offset",
+		scrollarea_.verticalScrollBar()->sliderPosition());
 
 	std::stringstream ss;
 	boost::archive::text_oarchive oa(ss);
@@ -296,6 +299,9 @@ void View::save_settings(QSettings &settings) const
 
 void View::restore_settings(QSettings &settings)
 {
+	// Note: It is assumed that this function is only called once,
+	// immediately after restoring a previous session.
+
 	if (settings.contains("scale"))
 		set_scale(settings.value("scale").toDouble());
 
@@ -315,6 +321,13 @@ void View::restore_settings(QSettings &settings)
 		signal->restore_settings(settings);
 		settings.endGroup();
 	}
+
+	if (settings.contains("v_offset")) {
+		saved_v_offset_ = settings.value("v_offset").toInt();
+		set_v_offset(saved_v_offset_);
+		scroll_needs_defaults_ = false;
+		// Note: see resizeEvent() for additional information
+	}
 }
 
 vector< shared_ptr<TimeItem> > View::time_items() const
@@ -799,7 +812,7 @@ void View::update_scroll()
 		vscrollbar->setRange(extents.first - areaSize.height(),
 			extents.second);
 
-	if (scroll_needs_defaults)
+	if (scroll_needs_defaults_)
 		set_scroll_default();
 }
 
@@ -814,15 +827,6 @@ void View::set_scroll_default()
 
 	const QSize areaSize = viewport_->size();
 
-	// Special case: when starting up and the window isn't visible yet,
-	// areaSize is [0, 0]. In this case we want to be called again later
-	if (areaSize.height() == 0) {
-		scroll_needs_defaults = true;
-		return;
-	} else {
-		scroll_needs_defaults = false;
-	}
-
 	const pair<int, int> extents = v_extents();
 	const int trace_height = extents.second - extents.first;
 
@@ -834,6 +838,11 @@ void View::set_scroll_default()
 	else
 		// Put the first trace at the top, letting the bottom ones overflow
 		set_v_offset(extents.first);
+
+	// If we're not sure whether setting the defaults worked as
+	// the window wasn't set up entirely yet, we want to be called
+	// again later to make sure
+	scroll_needs_defaults_ = !size_finalized_;
 }
 
 void View::update_layout()
@@ -957,6 +966,27 @@ bool View::eventFilter(QObject *object, QEvent *event)
 void View::resizeEvent(QResizeEvent*)
 {
 	update_layout();
+
+	// This is somewhat of a hack, unfortunately. We cannot use
+	// set_v_offset() from within restore_settings() as the view
+	// at that point is neither visible nor properly sized.
+	// This is the least intrusive workaround I could come up
+	// with: set the vertical offset (or scroll defaults) when
+	// the view is visible and resized to its final size.
+	// Resize events that are sent when the view is not visible
+	// must be ignored as they have wrong sizes, potentially
+	// preventing the v offset from being set successfully.
+
+	if (isVisible())
+		size_finalized_ = true;
+
+	if (size_finalized_ && saved_v_offset_) {
+		set_v_offset(saved_v_offset_);
+		saved_v_offset_ = 0;
+	}
+
+	if (size_finalized_ && scroll_needs_defaults_)
+		set_scroll_default();
 }
 
 void View::row_item_appearance_changed(bool label, bool content)
@@ -1162,11 +1192,11 @@ void View::signals_changed()
 		}
 
 	// Add and position the pending top levels items
+	int offset = v_extents().second;
 	for (auto item : new_top_level_items) {
 		add_child_item(item);
 
 		// Position the item after the last item or at the top if there is none
-		int offset = v_extents().second;
 		const pair<int, int> extents = item->v_extents();
 
 		if (item->enabled())