From 43f87541b6e25b401e4f209cd629b0d34a47401b Mon Sep 17 00:00:00 2001
From: Matthew Budd <mjbudd77@gmail.com>
Date: Fri, 13 Nov 2020 13:31:04 -0500
Subject: [PATCH] Added mouse wheel scrolling capability for Qt debugger ASM
 viewer.

---
 src/drivers/Qt/ConsoleDebugger.cpp | 52 ++++++++++++++++++++++++++++++
 src/drivers/Qt/ConsoleDebugger.h   |  3 ++
 2 files changed, 55 insertions(+)

diff --git a/src/drivers/Qt/ConsoleDebugger.cpp b/src/drivers/Qt/ConsoleDebugger.cpp
index ddb28ba1..5653410d 100644
--- a/src/drivers/Qt/ConsoleDebugger.cpp
+++ b/src/drivers/Qt/ConsoleDebugger.cpp
@@ -2837,6 +2837,8 @@ QAsmView::QAsmView(QWidget *parent)
 	selAddrValue = -1;
 	memset( selAddrText, 0, sizeof(selAddrText) );
 
+	wheelPixelCounter = 0;
+
 	//setSizePolicy( QSizePolicy::Preferred, QSizePolicy::Expanding );
    setFocusPolicy(Qt::StrongFocus);
 
@@ -3251,6 +3253,8 @@ void QAsmView::mousePressEvent(QMouseEvent * event)
 
 	line = lineOffset + c.y();
 
+	//printf("Mouse Button Pressed: 0x%x (%i,%i)\n", event->button(), c.x(), c.y() );
+	
 	if ( event->button() == Qt::LeftButton )
 	{
 		//printf("Left Button Pressed: (%i,%i)\n", c.x(), c.y() );
@@ -3399,6 +3403,54 @@ void QAsmView::mousePressEvent(QMouseEvent * event)
 	}
 }
 //----------------------------------------------------------------------------
+void QAsmView::wheelEvent(QWheelEvent *event)
+{
+
+	QPoint numPixels = event->pixelDelta();
+	QPoint numDegrees = event->angleDelta() / 8;
+
+	if (!numPixels.isNull()) 
+	{
+		wheelPixelCounter += numPixels.y();
+	   //printf("numPixels: (%i,%i) \n", numPixels.x(), numPixels.y() );
+	} 
+	else if (!numDegrees.isNull()) 
+	{
+		//QPoint numSteps = numDegrees / 15;
+		//printf("numSteps: (%i,%i) \n", numSteps.x(), numSteps.y() );
+		//printf("numDegrees: (%i,%i)  %i\n", numDegrees.x(), numDegrees.y(), pxLineSpacing );
+		wheelPixelCounter += (pxLineSpacing * numDegrees.y()) / 15;
+	}
+	//printf("Wheel Event: %i\n", wheelPixelCounter);
+
+	if ( wheelPixelCounter >= pxLineSpacing )
+	{
+		lineOffset += (wheelPixelCounter / pxLineSpacing);
+
+		if ( lineOffset > maxLineOffset )
+		{
+			lineOffset = maxLineOffset;
+		}
+		vbar->setValue( lineOffset );
+
+		wheelPixelCounter = wheelPixelCounter % pxLineSpacing;
+	}
+	else if ( wheelPixelCounter <= -pxLineSpacing )
+	{
+		lineOffset += (wheelPixelCounter / pxLineSpacing);
+
+		if ( lineOffset < 0 )
+		{
+			lineOffset = 0;
+		}
+		vbar->setValue( lineOffset );
+
+		wheelPixelCounter = wheelPixelCounter % pxLineSpacing;
+	}
+
+	 event->accept();
+}
+//----------------------------------------------------------------------------
 void QAsmView::contextMenuEvent(QContextMenuEvent *event)
 {
 	int line;
diff --git a/src/drivers/Qt/ConsoleDebugger.h b/src/drivers/Qt/ConsoleDebugger.h
index f8b51a07..e35e1c03 100644
--- a/src/drivers/Qt/ConsoleDebugger.h
+++ b/src/drivers/Qt/ConsoleDebugger.h
@@ -120,6 +120,7 @@ class QAsmView : public QWidget
 		void mouseReleaseEvent(QMouseEvent * event);
 		void mouseMoveEvent(QMouseEvent * event);
 		void resizeEvent(QResizeEvent *event);
+		void wheelEvent(QWheelEvent *event);
 		void contextMenuEvent(QContextMenuEvent *event);
 		void loadHighlightToClipboard(void);
 
@@ -167,6 +168,8 @@ class QAsmView : public QWidget
 		int  txtHlgtEndChar;
 		int  txtHlgtEndLine;
 
+		int  wheelPixelCounter;
+
 		dbg_asm_entry_t  *asmPC;
 		std::vector <dbg_asm_entry_t*> asmEntry;