From 08e96c97f7524190c40a1c5482076874f394a6a7 Mon Sep 17 00:00:00 2001
From: Bent Bisballe Nyeng <deva@aasimon.org>
Date: Sat, 9 Mar 2013 20:12:23 +0100
Subject: Make knob controllable using the arrow keys.

---
 plugingui/eventhandler.cc |  4 ++--
 plugingui/knob.cc         | 35 +++++++++++++++++++++++++++--------
 plugingui/knob.h          |  2 ++
 3 files changed, 31 insertions(+), 10 deletions(-)

(limited to 'plugingui')

diff --git a/plugingui/eventhandler.cc b/plugingui/eventhandler.cc
index 57718c2..b971b15 100644
--- a/plugingui/eventhandler.cc
+++ b/plugingui/eventhandler.cc
@@ -498,9 +498,9 @@ void GUI::EventHandler::processEvents(Window *window)
 
           if(be->direction == 1) {
             if(w->catchMouse()) window->setButtonDownFocus(w);
-          } else {
-            if(w->isFocusable()) window->setKeyboardFocus(w);
           }
+
+          if(w->isFocusable()) window->setKeyboardFocus(w);
         }
       }
       break;
diff --git a/plugingui/knob.cc b/plugingui/knob.cc
index d60ecc4..43bc3e8 100644
--- a/plugingui/knob.cc
+++ b/plugingui/knob.cc
@@ -78,10 +78,6 @@ void GUI::Knob::scrollEvent(ScrollEvent *e)
 void GUI::Knob::mouseMoveEvent(MouseMoveEvent *e)
 {
   if(state == down) {
-    /*
-    DEBUG(slider, "Knob::mouseMoveEvent(mouse_offset_x: %d,  e->x: %d)\n",
-          mouse_offset_x, e->x);
-    */
     if(mouse_offset_x == (e->x + -1*e->y)) return;
 
     float dval = mouse_offset_x - (e->x + -1*e->y);
@@ -97,19 +93,44 @@ void GUI::Knob::mouseMoveEvent(MouseMoveEvent *e)
   }
 }
 
+void GUI::Knob::keyEvent(KeyEvent *e)
+{
+  if(e->direction != -1) return;
+
+  switch(e->keycode) {
+  case GUI::KeyEvent::KEY_UP:
+    val += 0.01;
+    break;
+  case GUI::KeyEvent::KEY_DOWN:
+    val -= 0.01;
+    break;
+  case GUI::KeyEvent::KEY_HOME:
+    val = 0;
+    break;
+  case GUI::KeyEvent::KEY_END:
+    val = 1;
+    break;
+  default:
+    break;
+  }
+
+  if(val < 0) val = 0;
+  if(val > 1) val = 1;
+ 
+  repaintEvent(NULL);
+}
+
 void GUI::Knob::buttonEvent(ButtonEvent *e)
 {
   if(e->direction == 1) {
     state = down;
     mouse_offset_x = e->x + -1*e->y;
-    //val = maximum / (float)width() * (float)e->x;
     if(handler) handler(ptr);
     repaintEvent(NULL);
   }
   if(e->direction == -1) {
     state = up;
     mouse_offset_x = e->x + -1*e->y;
-    //val = maximum / (float)width() * (float)e->x;
     repaintEvent(NULL);
     clicked();
     if(handler) handler(ptr);
@@ -118,8 +139,6 @@ void GUI::Knob::buttonEvent(ButtonEvent *e)
 
 void GUI::Knob::repaintEvent(GUI::RepaintEvent *e)
 {
-  //  DEBUG(slider, "Knob::repaintEvent (%f)\n", val);
-
   Painter p(this);
 
   float alpha = 0.8;
diff --git a/plugingui/knob.h b/plugingui/knob.h
index a78361b..515d872 100644
--- a/plugingui/knob.h
+++ b/plugingui/knob.h
@@ -36,6 +36,7 @@ public:
   Knob(Widget *parent);
 
   bool catchMouse() { return true; }
+  bool isFocusable() { return true; }
 
   void setValue(float value);
   float value();
@@ -49,6 +50,7 @@ public:
   virtual void buttonEvent(ButtonEvent *e);
   virtual void mouseMoveEvent(MouseMoveEvent *e);
   virtual void scrollEvent(ScrollEvent *e);
+  virtual void keyEvent(KeyEvent *e);
 
 private:
   typedef enum {
-- 
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