annotate connectionitem.cpp @ 109:1721c580c10e

* Add a queueing mechanism for Hg actions, instead of refusing to start an action if something else is already happening.  This is essential now that actions can be prompted by asynchronous events (e.g. filesystem watcher).
 * Make Revert behave sensibly

/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */

/*
    EasyMercurial

    Based on HgExplorer by Jari Korhonen
    Copyright (c) 2010 Jari Korhonen
    Copyright (c) 2010 Chris Cannam
    Copyright (c) 2010 Queen Mary, University of London
    
    This program is free software; you can redistribute it and/or
    modify it under the terms of the GNU General Public License as
    published by the Free Software Foundation; either version 2 of the
    License, or (at your option) any later version.  See the file
    COPYING included with this distribution for more information.
*/

#include "connectionitem.h"

#include "changesetitem.h"
#include "changeset.h"
#include "colourset.h"

#include <QPainter>

QRectF
ConnectionItem::boundingRect() const
{
    if (!m_parent || !m_child) return QRectF();
    float xscale = 100;
    float yscale = 90;
    float size = 50;
    return QRectF(xscale * m_child->column() + size/2 - 2,
		  yscale * m_child->row() + size - 2,
		  xscale * m_parent->column() - xscale * m_child->column() + 4,
		  yscale * m_parent->row() - yscale * m_child->row() - size + 4)
	.normalized();
}

void
ConnectionItem::paint(QPainter *paint, const QStyleOptionGraphicsItem *, QWidget *)
{
    QPainterPath p;

    paint->save();

    ColourSet *colourSet = ColourSet::instance();
    QColor branchColour = colourSet->getColourFor(m_child->getChangeset()->branch());

    QTransform t = paint->worldTransform();
    float scale = std::min(t.m11(), t.m22());
    if (scale < 0.1) {
	paint->setPen(QPen(branchColour, 0));
    } else {
	paint->setPen(QPen(branchColour, 2));
    }

    float xscale = 100;

    float yscale = 90;
    float size = 50;
    float ygap = yscale - size;

    int c_col = m_child->column(), c_row = m_child->row();
    int p_col = m_parent->column(), p_row = m_parent->row();

    float c_x = xscale * c_col + size/2;
    float p_x = xscale * p_col + size/2;

    p.moveTo(c_x, yscale * c_row + size);

    if (p_col == c_col) {

	p.lineTo(p_x, yscale * p_row);

    } else if (m_type == Split || m_type == Normal) {

	// place the bulk of the line on the child (i.e. branch) row

	if (abs(p_row - c_row) > 1) {
	    p.lineTo(c_x, yscale * p_row - ygap);
	}

	p.cubicTo(c_x, yscale * p_row,
		  p_x, yscale * p_row - ygap,
		  p_x, yscale * p_row);

    } else if (m_type == Merge) {

	// place bulk of the line on the parent row

	p.cubicTo(c_x, yscale * c_row + size + ygap,
		  p_x, yscale * c_row + size,
		  p_x, yscale * c_row + size + ygap);

	if (abs(p_row - c_row) > 1) {
	    p.lineTo(p_x, yscale * p_row);
	}
    }

    paint->drawPath(p);
    paint->restore();
}