Re: [PATCH] kernel-shark: Show multi-line events in quick view

[Yordan Karadzhov <y.karadz@xxxxxxxxx>]

On 12/14/22 22:46, Steven Rostedt wrote:
> From: "Steven Rostedt (Google)" <rostedt@xxxxxxxxxxx>
>
> Some events (stack traces) have multiple lines, but the list view of each
> event is just a single line. To get the content of the full event, if the
> user selects the right mouse button over the event to trigger the quick
> view, display the entire content of the event.
Hi Steven

I wonder if the context menu is the best place to display those 
multi-line events. This menu is quite busy already and if you want to 
check a number of events, each time you have to open it then close it 
and reopen it again in order to see the next event. I think this can be 
a bit annoying.

An alternative can be to use the dual marker. For example we can make it 
to work such that all lines of the event selected with the markers are 
shown directly into the table.

I am attaching a RFC patch that that implements this. Note that I didn't 
time to fully test and debug this for all corner cases, but it should 
work at leas for the most straight-forward  use case. Please try it and 
tell me what you think.

Thanks!
Y.

> Signed-off-by: Steven Rostedt (Google) <rostedt@xxxxxxxxxxx>
> ---
>   src/KsQuickContextMenu.cpp | 9 +++++++++
>   src/KsQuickContextMenu.hpp | 2 +-
>   2 files changed, 10 insertions(+), 1 deletion(-)
>
> diff --git a/src/KsQuickContextMenu.cpp b/src/KsQuickContextMenu.cpp
> index 6fa242de348d..cc714bfb1aae 100644
> --- a/src/KsQuickContextMenu.cpp
> +++ b/src/KsQuickContextMenu.cpp
> @@ -52,6 +52,7 @@ KsQuickContextMenu::KsQuickContextMenu(KsDualMarkerSM *dm,
>     _row(row),
>     _rawTime(this),
>     _rawEvent(this),
> +  _eventInfo(this),
>     _graphSyncCBox(nullptr),
>     _listSyncCBox(nullptr),
>     _hideTaskAction(this),
> @@ -104,6 +105,14 @@ KsQuickContextMenu::KsQuickContextMenu(KsDualMarkerSM *dm,
>   		evtData += field + ":  " + val.setNum(fieldVal) + "\n\t";
>   	}
>   
> +	QString evtInfo("\t");
> +	evtInfo += kshark_get_info(entry);
> +	evtInfo += "\n";
> +
> +	addSection("Event info");
> +	_eventInfo.setDefaultWidget(new QLabel(evtInfo));
> +	addAction(&_eventInfo);
> +
>   	addSection("Raw event");
>   	time = QString("\ttime:  %1 [ns]").arg(entry->ts);
>   
> diff --git a/src/KsQuickContextMenu.hpp b/src/KsQuickContextMenu.hpp
> index ca0b341dd363..c07c1a534d3a 100644
> --- a/src/KsQuickContextMenu.hpp
> +++ b/src/KsQuickContextMenu.hpp
> @@ -91,7 +91,7 @@ private:
>   
>   	size_t		_row;
>   
> -	QWidgetAction	_rawTime, _rawEvent;
> +	QWidgetAction	_rawTime, _rawEvent, _eventInfo;
>   
>   	QCheckBox	*_graphSyncCBox, *_listSyncCBox;
From 99bce082ff08b2fb4ca20a4f6bfc32ee043f23dc Mon Sep 17 00:00:00 2001
From: Yordan Karadzhov <y.karadz@xxxxxxxxx>
Date: Tue, 20 Dec 2022 18:45:30 +0200
Subject: [RFC PATCH] kernel-shark: Show multi-line events using the dual
 marker

Signed-off-by: Yordan Karadzhov <y.karadz@xxxxxxxxx>
---
 src/KsTraceViewer.cpp | 18 +++++++++++++++++-
 src/KsTraceViewer.hpp |  2 ++
 2 files changed, 19 insertions(+), 1 deletion(-)

diff --git a/src/KsTraceViewer.cpp b/src/KsTraceViewer.cpp
index be0a419..97caaa0 100644
--- a/src/KsTraceViewer.cpp
+++ b/src/KsTraceViewer.cpp
@@ -110,6 +110,20 @@ KsTraceViewer::KsTraceViewer(QWidget *parent)
 	connect(&_searchFSM._searchRestartButton,	&QPushButton::pressed,
 		this,				&KsTraceViewer::_searchContinue);
 
+	int defaultRowHeight = FONT_HEIGHT * 1.25;
+	auto lamSelectionChanged = [this, defaultRowHeight](const QItemSelection &selected, const QItemSelection &deselected) {
+	    if (deselected.count() &&
+		deselected.indexes().first().row() != _mState->passiveMarker()._pos) {
+		_view.verticalHeader()->resizeSection(deselected.indexes().first().row(),
+						      defaultRowHeight);
+	    }
+	    if (selected.count()) {
+		_view.resizeRowToContents(selected.indexes().first().row());
+	    }
+	};
+	connect(&_selectionModel,	&QItemSelectionModel::selectionChanged,
+		lamSelectionChanged);
+
 	_searchFSM.placeInToolBar(&_toolbar);
 
 	/*
@@ -128,13 +142,15 @@ KsTraceViewer::KsTraceViewer(QWidget *parent)
 	_view.setEditTriggers(QAbstractItemView::NoEditTriggers);
 	_view.setSelectionBehavior(QAbstractItemView::SelectRows);
 	_view.setSelectionMode(QAbstractItemView::SingleSelection);
-	_view.verticalHeader()->setDefaultSectionSize(FONT_HEIGHT * 1.25);
+	_view.verticalHeader()->setDefaultSectionSize(defaultRowHeight);
 	_view.setFont(QFontDatabase::systemFont(QFontDatabase::FixedFont));
 	_view.horizontalHeader()->setFont(
 		QFontDatabase::systemFont(QFontDatabase::GeneralFont));
 
 	 _proxyModel.setSource(&_model);
+	_selectionModel.setModel(&_proxyModel);
 	_view.setModel(&_proxyModel);
+	_view.setSelectionModel(&_selectionModel);
 	connect(&_proxyModel, &QAbstractItemModel::modelReset,
 		this, &KsTraceViewer::_searchReset);
 
diff --git a/src/KsTraceViewer.hpp b/src/KsTraceViewer.hpp
index f3979a6..ae1929d 100644
--- a/src/KsTraceViewer.hpp
+++ b/src/KsTraceViewer.hpp
@@ -106,6 +106,8 @@ private:
 
 	KsFilterProxyModel	_proxyModel;
 
+	QItemSelectionModel 	_selectionModel;
+
 	QToolBar	_toolbar;
 
 	QLabel		_labelSearch, _labelGrFollows;
-- 
2.37.3