diff src/panned.cpp @ 370:b9c153e00e84

Move source files to src/

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/panned.cpp	Thu Mar 24 10:27:51 2011 +0000
@@ -0,0 +1,249 @@
+/* -*- 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) 2011 Chris Cannam
+    Copyright (c) 2011 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 "panned.h"
+#include "debug.h"
+
+#include <QScrollBar>
+#include <QWheelEvent>
+#include <QTimer>
+
+#include <cmath>
+
+#include <iostream>
+
+Panned::Panned() :
+    m_dragging(false)
+{
+    m_dragTimer = new QTimer(this);
+    m_dragTimerMs = 50;
+    connect(m_dragTimer, SIGNAL(timeout()), this, SLOT(dragTimerTimeout()));
+    setRenderHints(QPainter::Antialiasing |
+                   QPainter::TextAntialiasing);
+}
+
+void
+Panned::resizeEvent(QResizeEvent *ev)
+{
+    DEBUG << "Panned::resizeEvent()" << endl;
+
+    QPointF nearpt = mapToScene(0, 0);
+    QPointF farpt = mapToScene(width(), height());
+    QSizeF sz(farpt.x()-nearpt.x(), farpt.y()-nearpt.y());
+    QRectF pr(nearpt, sz);
+
+    QGraphicsView::resizeEvent(ev);
+
+    if (pr != m_pannedRect) {
+        DEBUG << "Panned: setting panned rect to " << pr << endl;
+        m_pannedRect = pr;
+        centerOn(pr.center());
+        emit pannedRectChanged(pr);
+    }
+}
+
+void
+Panned::setScene(QGraphicsScene *s)
+{
+    if (!scene()) {
+        QGraphicsView::setScene(s);
+        return;
+    }
+
+    QPointF nearpt = mapToScene(0, 0);
+    QPointF farpt = mapToScene(width(), height());
+    QSizeF sz(farpt.x()-nearpt.x(), farpt.y()-nearpt.y());
+    QRectF pr(nearpt, sz);
+
+    QGraphicsView::setScene(s);
+
+    DEBUG << "Panned::setScene: pr = " << pr << ", sceneRect = " << sceneRect() << endl;
+
+    if (scene() && sceneRect().intersects(pr)) {
+        DEBUG << "Panned::setScene: restoring old rect " << pr << endl;
+        m_pannedRect = pr;
+        centerOn(pr.center());
+        emit pannedRectChanged(pr);
+    }
+}
+
+void
+Panned::paintEvent(QPaintEvent *e)
+{
+    QGraphicsView::paintEvent(e);
+}
+
+void
+Panned::drawForeground(QPainter *paint, const QRectF &)
+{
+    QPointF nearpt = mapToScene(0, 0);
+    QPointF farpt = mapToScene(width(), height());
+    QSizeF sz(farpt.x()-nearpt.x(), farpt.y()-nearpt.y());
+    QRectF pr(nearpt, sz);
+
+    if (pr != m_pannedRect) {
+        DEBUG << "Panned::drawForeground: visible rect " << pr << " differs from panned rect " << m_pannedRect << ", updating panned rect" <<endl;
+        if (pr.x() != m_pannedRect.x()) emit pannedContentsScrolled();
+        m_pannedRect = pr;
+        emit pannedRectChanged(pr);
+    }
+}
+
+void
+Panned::zoomIn()
+{
+    QMatrix m = matrix();
+    m.scale(1.0 / 1.1, 1.0 / 1.1);
+    setMatrix(m);
+}
+
+void
+Panned::zoomOut()
+{
+    QMatrix m = matrix();
+    m.scale(1.1, 1.1);
+    setMatrix(m);
+}
+
+void
+Panned::slotSetPannedRect(QRectF pr)
+{
+    centerOn(pr.center());
+//	setSceneRect(pr);
+//	m_pannedRect = pr;
+}
+
+void
+Panned::wheelEvent(QWheelEvent *ev)
+{
+    if (ev->modifiers() & Qt::ControlModifier) {
+        int d = ev->delta();
+        if (d > 0) {
+            while (d > 0) {
+                zoomOut();
+                d -= 120;
+            }
+        } else {
+            while (d < 0) {
+                zoomIn();
+                d += 120;
+            }
+        }
+    } else {
+        emit wheelEventReceived(ev);
+        QGraphicsView::wheelEvent(ev);
+    }
+}
+
+void
+Panned::slotEmulateWheelEvent(QWheelEvent *ev)
+{
+    QGraphicsView::wheelEvent(ev);
+}
+
+void
+Panned::mousePressEvent(QMouseEvent *ev)
+{
+    if (dragMode() != QGraphicsView::ScrollHandDrag ||
+        ev->button() != Qt::LeftButton) {
+        QGraphicsView::mousePressEvent(ev);
+        return;
+    }
+
+    DEBUG << "Panned::mousePressEvent: have left button in drag mode" << endl;
+
+    setDragMode(QGraphicsView::NoDrag);
+    QGraphicsView::mousePressEvent(ev);
+    setDragMode(QGraphicsView::ScrollHandDrag);
+
+    if (!ev->isAccepted()) {
+        ev->accept();
+        m_dragging = true;
+        m_lastDragPos = ev->pos();
+        m_lastOrigin = QPoint(horizontalScrollBar()->value(),
+                              verticalScrollBar()->value());
+        m_velocity = QPointF(0, 0);
+        m_dragTimer->start(m_dragTimerMs);
+    }
+
+}
+
+void
+Panned::mouseMoveEvent(QMouseEvent *ev)
+{
+    if (!m_dragging) {
+        QGraphicsView::mouseMoveEvent(ev);
+        return;
+    }
+    DEBUG << "Panned::mouseMoveEvent: dragging" << endl;
+    ev->accept();
+    QScrollBar *hBar = horizontalScrollBar();
+    QScrollBar *vBar = verticalScrollBar();
+    QPoint delta = ev->pos() - m_lastDragPos;
+    hBar->setValue(hBar->value() + (isRightToLeft() ? delta.x() : -delta.x()));
+    vBar->setValue(vBar->value() - delta.y());
+    m_lastDragPos = ev->pos();
+}
+
+void
+Panned::mouseReleaseEvent(QMouseEvent *ev)
+{
+    if (!m_dragging) {
+        QGraphicsView::mouseReleaseEvent(ev);
+        return;
+    }
+    DEBUG << "Panned::mouseReleaseEvent: dragging" << endl;
+    ev->accept();
+    m_dragging = false;
+}
+
+void
+Panned::dragTimerTimeout()
+{
+    QPoint origin = QPoint(horizontalScrollBar()->value(),
+                           verticalScrollBar()->value());
+    if (m_dragging) {
+        m_velocity = QPointF
+            (float(origin.x() - m_lastOrigin.x()) / m_dragTimerMs,
+             float(origin.y() - m_lastOrigin.y()) / m_dragTimerMs);
+        m_lastOrigin = origin;
+        DEBUG << "Panned::dragTimerTimeout: velocity = " << m_velocity << endl;
+    } else {
+        if (origin == m_lastOrigin) {
+            m_dragTimer->stop();
+        }
+        float x = m_velocity.x(), y = m_velocity.y();
+        if (fabsf(x) > 1.0/m_dragTimerMs) x = x * 0.9f;
+        else x = 0.f;
+        if (fabsf(y) > 1.0/m_dragTimerMs) y = y * 0.9f;
+        else y = 0.f;
+        m_velocity = QPointF(x, y);
+        DEBUG << "Panned::dragTimerTimeout: velocity adjusted to " << m_velocity << endl;
+        m_lastOrigin = origin;
+        //!!! need to store origin in floats
+        horizontalScrollBar()->setValue(m_lastOrigin.x() +
+                                        m_velocity.x() * m_dragTimerMs);
+        verticalScrollBar()->setValue(m_lastOrigin.y() +
+                                      m_velocity.y() * m_dragTimerMs);
+    }
+}
+
+void
+Panned::leaveEvent(QEvent *)
+{
+    emit mouseLeaves();
+}