From d556005df149558e2614b7019ca4b180f9c44fb8 Mon Sep 17 00:00:00 2001
From: Bent Bisballe Nyeng <deva@aasimon.org>
Date: Thu, 7 Mar 2013 21:10:47 +0100
Subject: Add scrollEvent and use it for scrolling on listbox.

---
 plugingui/eventhandler.cc | 60 +++++++++++++++++++++++++++++++++++------------
 plugingui/guievent.h      | 11 +++++++++
 plugingui/listbox.cc      |  9 +++++++
 plugingui/listbox.h       |  1 +
 plugingui/widget.h        |  1 +
 5 files changed, 67 insertions(+), 15 deletions(-)

diff --git a/plugingui/eventhandler.cc b/plugingui/eventhandler.cc
index 3570b77..13a8dbf 100644
--- a/plugingui/eventhandler.cc
+++ b/plugingui/eventhandler.cc
@@ -122,10 +122,17 @@ LRESULT CALLBACK dialogProc(HWND hwnd, UINT msg, WPARAM wp, LPARAM lp)
 		break;
 
 	case WM_MOUSEWHEEL:
-		//fwKeys = LOWORD(wp);
-		//zDelta = (short) HIWORD(wp);
-		//xPos = (short) LOWORD(lp);
-		//yPos = (short) HIWORD(lp);
+    {
+      GUI::ScrollEvent *e = new GUI::ScrollEvent();
+      e->x = (int)(short) LOWORD(lp);
+      e->y = (int)(short) HIWORD(lp);
+      e->delta = (int)(short) HIWORD(wp);
+      handler->event = e;
+      //fwKeys = LOWORD(wp);
+      //zDelta = (short) HIWORD(wp);
+      //xPos = (short) LOWORD(lp);
+      //yPos = (short) HIWORD(lp);
+    }
  		break;
 
 	case WM_LBUTTONUP:
@@ -480,17 +487,26 @@ GUI::Event *GUI::EventHandler::getNextEvent()
   }
 
   if(xe.type == ButtonPress || xe.type == ButtonRelease) {
-    ButtonEvent *e = new ButtonEvent();
-    e->window_id = xe.xbutton.window;
-    e->x = xe.xbutton.x;
-    e->y = xe.xbutton.y;
-    e->button = 0;
-    e->direction = xe.type == ButtonPress?1:-1;
-    e->doubleclick =
-      xe.type == ButtonPress && (xe.xbutton.time - last_click) < 200;
-
-    if(xe.type == ButtonPress) last_click = xe.xbutton.time;
-    event = e;
+    if(xe.xbutton.button == 4 || xe.xbutton.button == 5) {
+      ScrollEvent *e = new ScrollEvent();
+      e->window_id = xe.xbutton.window;
+      e->x = xe.xbutton.x;
+      e->y = xe.xbutton.y;
+      e->delta = xe.xbutton.button==4?-1:1;
+      event = e;
+    } else {
+      ButtonEvent *e = new ButtonEvent();
+      e->window_id = xe.xbutton.window;
+      e->x = xe.xbutton.x;
+      e->y = xe.xbutton.y;
+      e->button = 0;
+      e->direction = xe.type == ButtonPress?1:-1;
+      e->doubleclick =
+        xe.type == ButtonPress && (xe.xbutton.time - last_click) < 200;
+      
+      if(xe.type == ButtonPress) last_click = xe.xbutton.time;
+      event = e;
+    }
   }
 
   if(xe.type == KeyPress || xe.type == KeyRelease) {
@@ -640,6 +656,20 @@ void GUI::EventHandler::processEvents(Window *window)
         }
       }
       break;
+    case Event::Scroll:
+      {
+        ScrollEvent *se = (ScrollEvent *)event;
+
+        Widget *w = window->find(se->x, se->y);
+
+        if(w) {
+          se->x -= w->windowX();
+          se->y -= w->windowY();
+
+          w->scrollEvent(se);
+        }
+      }
+      break;
     case Event::Key:
       //      window->key((KeyEvent*)event);
       //      lineedit->keyEvent((KeyEvent*)event);
diff --git a/plugingui/guievent.h b/plugingui/guievent.h
index d8d6955..db0328c 100644
--- a/plugingui/guievent.h
+++ b/plugingui/guievent.h
@@ -44,6 +44,7 @@ public:
     MouseMove,
     Repaint,
     Button,
+    Scroll,
     Key,
     Close,
     Resize
@@ -77,6 +78,16 @@ public:
   int doubleclick;
 };
 
+class ScrollEvent : public Event {
+public:
+  Type type() { return Scroll; }
+
+  int x;
+  int y;
+
+  int delta;
+};
+
 class RepaintEvent : public Event {
 public:
   Type type() { return Repaint; }
diff --git a/plugingui/listbox.cc b/plugingui/listbox.cc
index dfb5f07..f917368 100644
--- a/plugingui/listbox.cc
+++ b/plugingui/listbox.cc
@@ -125,6 +125,15 @@ void GUI::ListBox::repaintEvent(GUI::RepaintEvent *e)
                   width() - 1, height() - 1);
 }
 
+void GUI::ListBox::scrollEvent(ScrollEvent *e)
+{
+  scroll_offset += e->delta;
+  if(scroll_offset < 0) scroll_offset = 0;
+  if(scroll_offset > (items.size() - 1))
+    scroll_offset = (items.size() - 1);
+  repaintEvent(NULL);
+}
+
 void GUI::ListBox::buttonEvent(ButtonEvent *e)
 {
   //printf("click %d %d [dc: %d]\n", e->x, e->y, e->doubleclick);
diff --git a/plugingui/listbox.h b/plugingui/listbox.h
index 2a8dc4f..061a0eb 100644
--- a/plugingui/listbox.h
+++ b/plugingui/listbox.h
@@ -53,6 +53,7 @@ public:
 
   virtual void repaintEvent(RepaintEvent *e);
   virtual void buttonEvent(ButtonEvent *e);
+  virtual void scrollEvent(ScrollEvent *e);
 
 private:
   std::map<std::string, std::string> items;
diff --git a/plugingui/widget.h b/plugingui/widget.h
index c0d0a73..4a03d2a 100644
--- a/plugingui/widget.h
+++ b/plugingui/widget.h
@@ -63,6 +63,7 @@ public:
   virtual void repaintEvent(RepaintEvent *e) {}
   virtual void mouseMoveEvent(MouseMoveEvent *e) {}
   virtual void buttonEvent(ButtonEvent *e) {}
+  virtual void scrollEvent(ScrollEvent *e) {}
   virtual void keyEvent(KeyEvent *e) {}
 
   Widget *find(size_t x, size_t y);
-- 
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