From ccf6a266d9b911075512b4de16fe2ce2c2e767c4 Mon Sep 17 00:00:00 2001
From: Miklos Marton <martonmiklosqdev@gmail.com>
Date: Wed, 10 Jul 2019 16:15:33 +0200
Subject: [PATCH] Add home and end shortcuts

---
 pv/mainwindow.cpp       | 29 +++++++++++++++++++++++++++++
 pv/mainwindow.hpp       |  5 +++++
 pv/views/trace/view.cpp | 12 ++++++++++++
 pv/views/trace/view.hpp | 10 ++++++++++
 4 files changed, 56 insertions(+)

diff --git a/pv/mainwindow.cpp b/pv/mainwindow.cpp
index d04759cf..e33901a2 100644
--- a/pv/mainwindow.cpp
+++ b/pv/mainwindow.cpp
@@ -517,6 +517,12 @@ void MainWindow::setup_ui()
 	zoom_out_shortcut_ = new QShortcut(QKeySequence(Qt::Key_Minus), this, SLOT(on_zoom_out_shortcut_triggered()));
 	zoom_out_shortcut_->setAutoRepeat(false);
 
+	home_shortcut_ = new QShortcut(QKeySequence(Qt::Key_Home), this, SLOT(on_scroll_to_start_triggered()));
+	home_shortcut_->setAutoRepeat(false);
+
+	end_shortcut_ = new QShortcut(QKeySequence(Qt::Key_End), this, SLOT(on_scroll_to_end_triggered()));
+	end_shortcut_->setAutoRepeat(false);
+
 	// Set up the tab area
 	new_session_button_ = new QToolButton();
 	new_session_button_->setIcon(QIcon::fromTheme("document-new",
@@ -978,6 +984,29 @@ void MainWindow::on_zoom_in_shortcut_triggered()
 	zoom_current_view(1);
 }
 
+void MainWindow::on_scroll_to_start_triggered()
+{
+	scroll_to_start_or_end(true);
+}
+
+void MainWindow::on_scroll_to_end_triggered()
+{
+	scroll_to_start_or_end(false);
+}
+
+void MainWindow::scroll_to_start_or_end(bool start)
+{
+	shared_ptr<Session> session = get_tab_session(session_selector_.currentIndex());
+
+	if (!session)
+		return;
+
+	shared_ptr<views::ViewBase> v = session.get()->main_view();
+	views::trace::View *tv =
+		qobject_cast<views::trace::View*>(v.get());
+	tv->set_h_offset(start ? 0 : tv->get_h_scrollbar_maximum());
+}
+
 void MainWindow::on_close_current_tab()
 {
 	int tab = session_selector_.currentIndex();
diff --git a/pv/mainwindow.hpp b/pv/mainwindow.hpp
index 6f2fded9..141e96e9 100644
--- a/pv/mainwindow.hpp
+++ b/pv/mainwindow.hpp
@@ -109,6 +109,7 @@ private:
 	void restore_ui_settings();
 
 	void zoom_current_view(double steps);
+	void scroll_to_start_or_end(bool start);
 
 	shared_ptr<Session> get_tab_session(int index) const;
 
@@ -152,6 +153,8 @@ private Q_SLOTS:
 
 	void on_zoom_out_shortcut_triggered();
 	void on_zoom_in_shortcut_triggered();
+	void on_scroll_to_start_triggered();
+	void on_scroll_to_end_triggered();
 
 	void on_close_current_tab();
 
@@ -184,6 +187,8 @@ private:
 	QShortcut *close_current_tab_shortcut_;
 	QShortcut *zoom_in_shortcut_;
 	QShortcut *zoom_out_shortcut_;
+	QShortcut *home_shortcut_;
+	QShortcut *end_shortcut_;
 };
 
 } // namespace pv
diff --git a/pv/views/trace/view.cpp b/pv/views/trace/view.cpp
index 56461e46..f2a3335e 100644
--- a/pv/views/trace/view.cpp
+++ b/pv/views/trace/view.cpp
@@ -510,6 +510,18 @@ void View::set_v_offset(int offset)
 	viewport_->update();
 }
 
+void View::set_h_offset(int offset)
+{
+	scrollarea_->horizontalScrollBar()->setSliderPosition(offset);
+	header_->update();
+	viewport_->update();
+}
+
+int View::get_h_scrollbar_maximum() const
+{
+	return scrollarea_->horizontalScrollBar()->maximum();
+}
+
 unsigned int View::depth() const
 {
 	return 0;
diff --git a/pv/views/trace/view.hpp b/pv/views/trace/view.hpp
index e056805b..a0e6f6bc 100644
--- a/pv/views/trace/view.hpp
+++ b/pv/views/trace/view.hpp
@@ -189,6 +189,16 @@ public:
 	 */
 	void set_v_offset(int offset);
 
+	/**
+	 * Sets the visual h-offset.
+	 */
+	void set_h_offset(int offset);
+
+	/**
+	 * Gets the length of the horizontal scrollbar.
+	 */
+	int get_h_scrollbar_maximum() const;
+
 	/**
 	 * Returns the SI prefix to apply to the graticule time markings.
 	 */
-- 
2.30.2