Fix #969 by scheduling another call after a small delay

[pulseview.git] / pv / view / view.cpp

diff --git a/pv/view/view.cpp b/pv/view/view.cpp
index 4ac98114104a4eb603aea4c9000e825a8f99dc2c..1cb03afcf3cbf5f5c0fd33ebee12c226b5a5797e 100644 (file)
--- a/pv/view/view.cpp
+++ b/pv/view/view.cpp
@@ -872,7 +872,7 @@ void View::set_scroll_default()
                set_v_offset(extents.first);
 }
 
-bool View::header_fully_visible() const
+bool View::header_was_shrunk() const
 {
        const int header_pane_width = splitter_->sizes().front();
        const int header_width = header_->extended_size_hint().width();
@@ -880,24 +880,31 @@ bool View::header_fully_visible() const
        // Allow for a slight margin of error so that we also accept
        // slight differences when e.g. a label name change increased
        // the overall width
-       return (header_pane_width >= (header_width - 10));
+       return (header_pane_width < (header_width - 10));
 }
 
-void View::update_layout()
+void View::expand_header_to_fit()
 {
-       // Only adjust pane sizes if the header hasn't been partially hidden by the user
-       if (header_fully_visible()) {
-               int splitter_area_width = 0;
-               for (int w : splitter_->sizes())
-                       splitter_area_width += w;
-
-               // Make sure the header has enough horizontal space to show all labels fully
-               QList<int> pane_sizes;
-               pane_sizes.push_back(header_->extended_size_hint().width());
-               pane_sizes.push_back(splitter_area_width - header_->extended_size_hint().width());
-               splitter_->setSizes(pane_sizes);
+       int splitter_area_width = 0;
+       for (int w : splitter_->sizes())
+               splitter_area_width += w;
+
+       // Workaround for when the header needs resizing but the view
+       // isn't visible yet and thus splitter_->sizes() returns (0, 0)
+       if (splitter_area_width == 0) {
+               QTimer::singleShot(50, this, SLOT(on_repeat_splitter_expansion()));
+               return;
        }
 
+       // Make sure the header has enough horizontal space to show all labels fully
+       QList<int> pane_sizes;
+       pane_sizes.push_back(header_->extended_size_hint().width());
+       pane_sizes.push_back(splitter_area_width - header_->extended_size_hint().width());
+       splitter_->setSizes(pane_sizes);
+}
+
+void View::update_layout()
+{
        update_scroll();
 }
 
@@ -1071,8 +1078,17 @@ void View::on_splitter_moved()
        // Setting the maximum width of the header widget doesn't work as
        // expected because the splitter would allow the user to make the
        // pane wider than that, creating empty space as a result.
-       // To make this work, we stricly enforce the maximum width by calling
-       update_layout();
+       // To make this work, we stricly enforce the maximum width by
+       // expanding the header unless the user shrunk it on purpose.
+       // As we're then setting the width of the header pane, we set the
+       // splitter to the maximum allowed position.
+       if (!header_was_shrunk())
+               expand_header_to_fit();
+}
+
+void View::on_repeat_splitter_expansion()
+{
+       expand_header_to_fit();
 }
 
 void View::h_scroll_value_changed(int value)
@@ -1270,6 +1286,12 @@ void View::signals_changed()
                        offset += extents.second;
        }
 
+
+       if (!new_top_level_items.empty())
+               // Expand the header pane because the header should become fully
+               // visible when new signals are added
+               expand_header_to_fit();
+
        update_layout();
 
        header_->update();