From b1766c28b276e102bed83652c467df9db270b3ac Mon Sep 17 00:00:00 2001
From: Max Horn
Date: Wed, 16 Oct 2002 20:32:12 +0000
Subject: patch #620627: mouse wheel support for NewGui

svn-id: r5169
---
 gui/ListWidget.cpp      |  5 +++++
 gui/ListWidget.h        |  1 +
 gui/ScrollBarWidget.cpp | 18 ++++++++++++++++++
 gui/ScrollBarWidget.h   |  1 +
 gui/dialog.cpp          | 15 +++++++++++++++
 gui/dialog.h            |  1 +
 gui/newgui.cpp          |  6 ++++++
 gui/widget.h            |  1 +
 8 files changed, 48 insertions(+)

(limited to 'gui')

diff --git a/gui/ListWidget.cpp b/gui/ListWidget.cpp
index fb01146b35..b477f4f9ea 100644
--- a/gui/ListWidget.cpp
+++ b/gui/ListWidget.cpp
@@ -85,6 +85,11 @@ void ListWidget::handleMouseUp(int x, int y, int button, int clickCount)
 	}
 }
 
+void ListWidget::handleMouseWheel(int x, int y, int direction)
+{
+	_scrollBar->handleMouseWheel(x, y, direction);
+}
+
 bool ListWidget::handleKeyDown(char key, int modifiers)
 {
 	bool handled = true;
diff --git a/gui/ListWidget.h b/gui/ListWidget.h
index 7f05f72a2b..59af0ba1b2 100644
--- a/gui/ListWidget.h
+++ b/gui/ListWidget.h
@@ -68,6 +68,7 @@ public:
 	
 	virtual void handleMouseDown(int x, int y, int button, int clickCount);
 	virtual void handleMouseUp(int x, int y, int button, int clickCount);
+	virtual void handleMouseWheel(int x, int y, int direction);
 	virtual bool handleKeyDown(char key, int modifiers);
 	virtual bool handleKeyUp(char key, int modifiers);
 	virtual void handleCommand(CommandSender *sender, uint32 cmd, uint32 data);
diff --git a/gui/ScrollBarWidget.cpp b/gui/ScrollBarWidget.cpp
index c9653ef72c..52dd22ef60 100644
--- a/gui/ScrollBarWidget.cpp
+++ b/gui/ScrollBarWidget.cpp
@@ -31,6 +31,7 @@
  * - Allow for a horizontal scrollbar, too?
  * - If there are less items than fit on one pages, no scrolling can be done
  *   and we thus should not highlight the arrows/slider.
+ * - Allow the mouse wheel to scroll more than one line at a time
  */
 
 #define UP_DOWN_BOX_HEIGHT	10
@@ -104,6 +105,23 @@ void ScrollBarWidget::handleMouseUp(int x, int y, int button, int clickCount)
 	_draggingPart = kNoPart;
 }
 
+void ScrollBarWidget::handleMouseWheel(int x, int y, int direction)
+{
+	int old_pos = _currentPos;
+
+	if (_numEntries < _entriesPerPage)
+		return;
+
+	if (direction < 0) {
+		_currentPos--;
+	} else {
+		_currentPos++;
+	}
+
+	// Make sure that _currentPos is still inside the bounds
+	checkBounds(old_pos);
+}
+
 void ScrollBarWidget::handleMouseMoved(int x, int y, int button)
 {
 	// Do nothing if there are less items than fit on one page
diff --git a/gui/ScrollBarWidget.h b/gui/ScrollBarWidget.h
index e4b5752746..6dc76d72b9 100644
--- a/gui/ScrollBarWidget.h
+++ b/gui/ScrollBarWidget.h
@@ -61,6 +61,7 @@ public:
 
 	void handleMouseDown(int x, int y, int button, int clickCount);
 	void handleMouseUp(int x, int y, int button, int clickCount);
+	void handleMouseWheel(int x, int y, int direction);
 	void handleMouseMoved(int x, int y, int button);
 	void handleMouseEntered(int button)	{ setFlags(WIDGET_HILITED); }
 	void handleMouseLeft(int button)	{ clearFlags(WIDGET_HILITED); _part = kNoPart; draw(); }
diff --git a/gui/dialog.cpp b/gui/dialog.cpp
index 09f76edb1c..679637967b 100644
--- a/gui/dialog.cpp
+++ b/gui/dialog.cpp
@@ -163,6 +163,21 @@ void Dialog::handleMouseUp(int x, int y, int button, int clickCount)
 		w->handleMouseUp(x - w->_x, y - w->_y, button, clickCount);
 }
 
+void Dialog::handleMouseWheel(int x, int y, int direction)
+{
+	Widget *w;
+
+	// This may look a bit backwards, but I think it makes more sense for
+	// the mouse wheel to primarily affect the widget the mouse is at than
+	// the widget that happens to be focused.
+
+	w = findWidget(x, y);
+	if (!w)
+		w = _focusedWidget;
+	if (w)
+		w->handleMouseWheel(x, y, direction);
+}
+
 void Dialog::handleKeyDown(char key, int modifiers)
 {
 	if (_focusedWidget) {
diff --git a/gui/dialog.h b/gui/dialog.h
index 7d7224c480..82ad3d9292 100644
--- a/gui/dialog.h
+++ b/gui/dialog.h
@@ -64,6 +64,7 @@ protected:
 	virtual void handleTickle(); // Called periodically (in every guiloop() )
 	virtual void handleMouseDown(int x, int y, int button, int clickCount);
 	virtual void handleMouseUp(int x, int y, int button, int clickCount);
+	virtual void handleMouseWheel(int x, int y, int direction);
 	virtual void handleKeyDown(char key, int modifiers);
 	virtual void handleKeyUp(char key, int modifiers);
 	virtual void handleMouseMoved(int x, int y, int button);
diff --git a/gui/newgui.cpp b/gui/newgui.cpp
index 61f50e2b72..ffe8d503cc 100644
--- a/gui/newgui.cpp
+++ b/gui/newgui.cpp
@@ -169,6 +169,12 @@ void NewGui::runLoop()
 				case OSystem::EVENT_RBUTTONUP:
 					activeDialog->handleMouseUp(event.mouse.x - activeDialog->_x, event.mouse.y - activeDialog->_y, 1, _lastClick.count);
 					break;
+				case OSystem::EVENT_WHEELUP:
+					activeDialog->handleMouseWheel(event.mouse.x - activeDialog->_x, event.mouse.y - activeDialog->_y, -1);
+					break;
+				case OSystem::EVENT_WHEELDOWN:
+					activeDialog->handleMouseWheel(event.mouse.x - activeDialog->_x, event.mouse.y - activeDialog->_y, 1);
+					break;
 			}
 		}
 
diff --git a/gui/widget.h b/gui/widget.h
index 718a50f444..99808d49a3 100644
--- a/gui/widget.h
+++ b/gui/widget.h
@@ -103,6 +103,7 @@ public:
 	virtual void handleMouseEntered(int button) {}
 	virtual void handleMouseLeft(int button) {}
 	virtual void handleMouseMoved(int x, int y, int button) {}
+	virtual void handleMouseWheel(int x, int y, int direction) {}
 	virtual bool handleKeyDown(char key, int modifiers) { return false; }	// Return true if the event was handled
 	virtual bool handleKeyUp(char key, int modifiers) { return false; }	// Return true if the event was handled
 	virtual void handleTickle() {}
-- 
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