LibVT/Terminal: add a scroll length to the TerminalWidget

The scroll length is the number of lines by which the terminal will go
up/down when scrolling the mouse wheel once.

2 files changed, 14 insertions, 1 deletions

diff --git a/Libraries/LibVT/TerminalWidget.cpp b/Libraries/LibVT/TerminalWidget.cpp
index 672460664e..8b30db01ca 100644
--- a/Libraries/LibVT/TerminalWidget.cpp
+++ b/Libraries/LibVT/TerminalWidget.cpp
@@ -105,6 +105,7 @@ TerminalWidget::TerminalWidget(int ptm_fd, bool automatic_size_policy, RefPtr<Co
     m_scrollbar->on_change = [this](int) {
         force_repaint();
     };
+    set_scroll_length(m_config->read_num_entry("Window", "ScrollLength", 1));
 
     dbgprintf("Terminal: Load config file from %s\n", m_config->file_name().characters());
     m_cursor_blink_timer->set_interval(m_config->read_num_entry("Text",
@@ -672,7 +673,7 @@ void TerminalWidget::mousewheel_event(GUI::MouseEvent& event)
 {
     if (!is_scrollable())
         return;
-    m_scrollbar->set_value(m_scrollbar->value() + event.wheel_delta());
+    m_scrollbar->set_value(m_scrollbar->value() + event.wheel_delta() * scroll_length());
     GUI::Frame::mousewheel_event(event);
 }
 
@@ -681,6 +682,16 @@ bool TerminalWidget::is_scrollable() const
     return m_scrollbar->is_scrollable();
 }
 
+int TerminalWidget::scroll_length() const
+{
+    return m_scrollbar->step();
+}
+
+void TerminalWidget::set_scroll_length(int length)
+{
+    m_scrollbar->set_step(length);
+}
+
 String TerminalWidget::selected_text() const
 {
     StringBuilder builder;
diff --git a/Libraries/LibVT/TerminalWidget.h b/Libraries/LibVT/TerminalWidget.h
index 6be5328079..af6b91d1bf 100644
--- a/Libraries/LibVT/TerminalWidget.h
+++ b/Libraries/LibVT/TerminalWidget.h
@@ -74,6 +74,8 @@ public:
     VT::Position normalized_selection_end() const;
 
     bool is_scrollable() const;
+    int scroll_length() const;
+    void set_scroll_length(int);
 
     GUI::Action& copy_action() { return *m_copy_action; }
     GUI::Action& paste_action() { return *m_paste_action; }