From 0d08f115043188ac3d4c76c39c31508ddc61c3f9 Mon Sep 17 00:00:00 2001
From: "v.audacity" <v.audacity@47890b92-0858-11df-a26f-8b716316a5bc>
Date: Tue, 14 Feb 2012 00:18:29 +0000
Subject: [PATCH] Fix bug 187.

---
 src/Project.cpp    |  8 ++++++++
 src/TrackPanel.cpp | 10 ++++++++++
 src/TrackPanel.h   |  2 ++
 3 files changed, 20 insertions(+)

diff --git a/src/Project.cpp b/src/Project.cpp
index f82f360db..c838ff3e8 100644
--- a/src/Project.cpp
+++ b/src/Project.cpp
@@ -1650,6 +1650,14 @@ bool AudacityProject::HandleKeyDown(wxKeyEvent & event)
    if (event.GetKeyCode() == WXK_CONTROL)
       mTrackPanel->HandleControlKey(true);
 
+   // Allow PageUp and PageDown keys to 
+   //scroll the Track Panel left and right
+   if (event.GetKeyCode() == WXK_PAGEUP)
+      mTrackPanel->HandlePageUpKey();
+   
+   if (event.GetKeyCode() == WXK_PAGEDOWN)
+      mTrackPanel->HandlePageDownKey();
+
    // If a window has captured the keyboard, then allow it
    // first dibs at the event.  If it does an event.Skip(false)
    // then allow the event to process as normal, bypassing the
diff --git a/src/TrackPanel.cpp b/src/TrackPanel.cpp
index 9a49da9bf..5ebd21138 100644
--- a/src/TrackPanel.cpp
+++ b/src/TrackPanel.cpp
@@ -1375,6 +1375,16 @@ void TrackPanel::HandleControlKey(bool down)
    HandleCursorForLastMouseEvent();
 }
 
+void TrackPanel::HandlePageUpKey()
+{
+   mListener->TP_ScrollWindow(mViewInfo->h + mViewInfo->screen);
+}
+
+void TrackPanel::HandlePageDownKey()
+{
+   mListener->TP_ScrollWindow(mViewInfo->h - mViewInfo->screen);
+}
+
 void TrackPanel::HandleCursorForLastMouseEvent()
 {
    HandleCursor(mLastMouseEvent);
diff --git a/src/TrackPanel.h b/src/TrackPanel.h
index 5ef4046ca..00d39aa66 100644
--- a/src/TrackPanel.h
+++ b/src/TrackPanel.h
@@ -225,6 +225,8 @@ class AUDACITY_DLL_API TrackPanel:public wxPanel {
 
    virtual void HandleShiftKey(bool down);
    virtual void HandleControlKey(bool down);
+   virtual void HandlePageUpKey();
+   virtual void HandlePageDownKey();
    virtual AudacityProject * GetProject() const;
 
    virtual void OnPrevTrack(bool shift = false);