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#include <QtGui/QtGui>

#include "debugqtview.h"


DebuggerView::DebuggerView(const debug_view_type& type,
							running_machine* machine,
							QWidget* parent) :
	QAbstractScrollArea(parent),
	m_preferBottom(false),
	m_view(NULL),
	m_machine(machine)
{
	QFont viewFontRequest("Courier");
	viewFontRequest.setFixedPitch(true);
	viewFontRequest.setPointSize(12);
	setFont(viewFontRequest);

	m_view = m_machine->debug_view().alloc_view(type,
												DebuggerView::debuggerViewUpdate,
												this);
}


void DebuggerView::paintEvent(QPaintEvent* event)
{
	// Tell the MAME debug view how much real estate is available
	QFontMetrics actualFont = fontMetrics();
	const int fontWidth = MAX(1, actualFont.maxWidth());
	const int fontHeight = MAX(1, actualFont.height());
	m_view->set_visible_size(debug_view_xy(width()/fontWidth, height()/fontHeight));


	// Handle the scroll bars
	const int verticalScrollCharDiff = m_view->total_size().y - m_view->visible_size().y;
	const int scrollSize = verticalScrollCharDiff < 0 ? 0 : verticalScrollCharDiff;
	bool atEnd = false;
	if (verticalScrollBar()->value() == verticalScrollBar()->maximum())
	{
		atEnd = true;
	}
	verticalScrollBar()->setRange(0, scrollSize);
	if (m_preferBottom && atEnd)
	{
		verticalScrollBar()->setValue(scrollSize);
	}
	m_view->set_visible_position(debug_view_xy(0, verticalScrollBar()->value()));


	// Draw the viewport widget
	QPainter painter(viewport());
	painter.fillRect(0, 0, width(), height(), QBrush(Qt::white));
	painter.setBackgroundMode(Qt::OpaqueMode);
	painter.setBackground(QColor(255,255,255));

	// Background control
	QBrush bgBrush;
	bgBrush.setStyle(Qt::SolidPattern);
	painter.setPen(QPen(QColor(0,0,0)));

	size_t viewDataOffset = 0;
	const debug_view_xy& visibleCharDims = m_view->visible_size();
	for (int y = 0; y < visibleCharDims.y; y++)
	{
		for (int x = 0; x < visibleCharDims.x; x++)
		{
			const unsigned char textAttr = m_view->viewdata()[viewDataOffset].attrib;

			if (x == 0 || textAttr != m_view->viewdata()[viewDataOffset-1].attrib)
			{
				// Text color handling
				QColor fgColor(0,0,0);
				QColor bgColor(255,255,255);

				if(textAttr & DCA_ANCILLARY)
				{
					bgColor.setRgb(0xe0, 0xe0, 0xe0);
				}
				if(textAttr & DCA_SELECTED)
				{
					bgColor.setRgb(0xff, 0x80, 0x80);
				}
				if(textAttr & DCA_CURRENT)
				{
					bgColor.setRgb(0xff, 0xff, 0x00);
				}
				if(textAttr & DCA_CHANGED)
				{
					fgColor.setRgb(0xff, 0x00, 0x00);
				}
				if(textAttr & DCA_INVALID)
				{
					fgColor.setRgb(0x00, 0x00, 0xff);
				}
				if(textAttr & DCA_DISABLED)
				{
					fgColor.setRgb((fgColor.red()   + bgColor.red())   >> 1,
									(fgColor.green() + bgColor.green()) >> 1,
									(fgColor.blue()  + bgColor.blue())  >> 1);
				}
				if(textAttr & DCA_COMMENT)
				{
					fgColor.setRgb(0x00, 0x80, 0x00);
				}

				bgBrush.setColor(bgColor);
				painter.setBackground(bgBrush);
				painter.setPen(QPen(fgColor));
			}

			// There is a touchy interplay between font height, drawing difference, visible position, etc
			// To test, set the bgcolor to something crazy and see where stuff gets drawn
			painter.drawText(x*fontWidth,
								y*fontHeight + fontHeight,
								QString(m_view->viewdata()[viewDataOffset].byte));
			viewDataOffset++;
		}
	}
}


void DebuggerView::keyPressEvent(QKeyEvent* event)
{
	if (m_view == NULL)
		return QWidget::keyPressEvent(event);

	Qt::KeyboardModifiers keyMods = QApplication::keyboardModifiers();
	bool ctrlDown = keyMods.testFlag(Qt::ControlModifier);

	int keyPress = -1;
	switch (event->key())
	{
		case Qt::Key_Up:
			keyPress = DCH_UP;
			break;
		case Qt::Key_Down:
			keyPress = DCH_DOWN;
			break;
		case Qt::Key_Left:
			keyPress = DCH_LEFT;
			if (ctrlDown) keyPress = DCH_CTRLLEFT;
			break;
		case Qt::Key_Right:
			keyPress = DCH_RIGHT;
			if (ctrlDown) keyPress = DCH_CTRLRIGHT;
			break;
		case Qt::Key_PageUp:
			keyPress = DCH_PUP;
			break;
		case Qt::Key_PageDown:
			keyPress = DCH_PDOWN;
			break;
		case Qt::Key_Home:
			keyPress = DCH_HOME;
			if (ctrlDown) keyPress = DCH_CTRLHOME;
			break;
		case Qt::Key_End:
			keyPress = DCH_END;
			if (ctrlDown) keyPress = DCH_CTRLEND;
			break;
		case Qt::Key_0: keyPress = '0'; break;
		case Qt::Key_1: keyPress = '1'; break;
		case Qt::Key_2: keyPress = '2'; break;
		case Qt::Key_3: keyPress = '3'; break;
		case Qt::Key_4: keyPress = '4'; break;
		case Qt::Key_5: keyPress = '5'; break;
		case Qt::Key_6: keyPress = '6'; break;
		case Qt::Key_7: keyPress = '7'; break;
		case Qt::Key_8: keyPress = '8'; break;
		case Qt::Key_9: keyPress = '9'; break;
		case Qt::Key_A: keyPress = 'a'; break;
		case Qt::Key_B: keyPress = 'b'; break;
		case Qt::Key_C: keyPress = 'c'; break;
		case Qt::Key_D: keyPress = 'd'; break;
		case Qt::Key_E: keyPress = 'e'; break;
		case Qt::Key_F: keyPress = 'f'; break;
		default:
			return QWidget::keyPressEvent(event);
	}

	m_view->set_cursor_visible(true);
	m_view->process_char(keyPress);

	// Catch the view up with the cursor
	verticalScrollBar()->setValue(m_view->visible_position().y);

	viewport()->update();
	update();
}


void DebuggerView::debuggerViewUpdate(debug_view& debugView, void* osdPrivate)
{
	// Get a handle to the DebuggerView being updated & redraw
	DebuggerView* dView = (DebuggerView*)osdPrivate;
	dView->verticalScrollBar()->setValue(dView->view()->visible_position().y);
	dView->viewport()->update();
	dView->update();
}