view view/PaneStack.cpp @ 312:6de6f78b13a1

* Make it possible to drop audio files, layer files, session files and images
  onto SV panes.
  Need to do a bit more work on where we expect the dropped file to go,
  particularly in the case of audio files -- at the moment they're always
  opened in new panes, but it may be better to by default replace whatever is
  in the target pane.

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

/*
    Sonic Visualiser
    An audio file viewer and annotation editor.
    Centre for Digital Music, Queen Mary, University of London.
    This file copyright 2006 Chris Cannam and QMUL.
    
    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 "PaneStack.h"

#include "Pane.h"
#include "widgets/PropertyStack.h"
#include "layer/Layer.h"
#include "ViewManager.h"

#include <QApplication>
#include <QHBoxLayout>
#include <QPainter>
#include <QPalette>
#include <QLabel>
#include <QSplitter>
#include <QStackedWidget>

#include <iostream>

//#define DEBUG_PANE_STACK 1

PaneStack::PaneStack(QWidget *parent, ViewManager *viewManager) :
    QFrame(parent),
    m_currentPane(0),
    m_splitter(new QSplitter),
    m_propertyStackStack(new QStackedWidget),
    m_viewManager(viewManager),
    m_layoutStyle(PropertyStackPerPaneLayout)
{
    QHBoxLayout *layout = new QHBoxLayout;
    layout->setMargin(0);
    layout->setSpacing(0);

    m_splitter->setOrientation(Qt::Vertical);
    m_splitter->setOpaqueResize(false);

    layout->addWidget(m_splitter);
    layout->setStretchFactor(m_splitter, 1);
    layout->addWidget(m_propertyStackStack);
    m_propertyStackStack->hide();

    setLayout(layout);
}

Pane *
PaneStack::addPane(bool suppressPropertyBox)
{
    QFrame *frame = new QFrame;
    QHBoxLayout *layout = new QHBoxLayout;
    layout->setMargin(0);
    layout->setSpacing(2);

    QLabel *currentIndicator = new QLabel(frame);
    currentIndicator->setFixedWidth(QPainter(this).fontMetrics().width("x"));
    layout->addWidget(currentIndicator);
    layout->setStretchFactor(currentIndicator, 1);
    currentIndicator->setScaledContents(true);

    Pane *pane = new Pane(frame);
    pane->setViewManager(m_viewManager);
    layout->addWidget(pane);
    layout->setStretchFactor(pane, 10);

    QWidget *properties = 0;
    if (suppressPropertyBox) {
	properties = new QFrame();
    } else {
	properties = new PropertyStack(frame, pane);
	connect(properties, SIGNAL(propertyContainerSelected(View *, PropertyContainer *)),
		this, SLOT(propertyContainerSelected(View *, PropertyContainer *)));
        connect(properties, SIGNAL(viewSelected(View  *)),
                this, SLOT(viewSelected(View *)));
        connect(properties, SIGNAL(contextHelpChanged(const QString &)),
                this, SIGNAL(contextHelpChanged(const QString &)));
    }
    if (m_layoutStyle == PropertyStackPerPaneLayout) {
        layout->addWidget(properties);
    } else {
        properties->setParent(m_propertyStackStack);
        m_propertyStackStack->addWidget(properties);
    }
    layout->setStretchFactor(properties, 1);

    PaneRec rec;
    rec.pane = pane;
    rec.propertyStack = properties;
    rec.currentIndicator = currentIndicator;
    rec.frame = frame;
    rec.layout = layout;
    m_panes.push_back(rec);

    frame->setLayout(layout);
    m_splitter->addWidget(frame);

    connect(pane, SIGNAL(propertyContainerAdded(PropertyContainer *)),
	    this, SLOT(propertyContainerAdded(PropertyContainer *)));
    connect(pane, SIGNAL(propertyContainerRemoved(PropertyContainer *)),
	    this, SLOT(propertyContainerRemoved(PropertyContainer *)));
    connect(pane, SIGNAL(paneInteractedWith()),
	    this, SLOT(paneInteractedWith()));
    connect(pane, SIGNAL(rightButtonMenuRequested(QPoint)),
            this, SLOT(rightButtonMenuRequested(QPoint)));
    connect(pane, SIGNAL(dropAccepted(QStringList)),
            this, SLOT(paneDropAccepted(QStringList)));
    connect(pane, SIGNAL(dropAccepted(QString)),
            this, SLOT(paneDropAccepted(QString)));

    emit paneAdded(pane);
    emit paneAdded();

    if (!m_currentPane) {
	setCurrentPane(pane);
    }

    return pane;
}

void
PaneStack::setPropertyStackMinWidth(int mw)
{
    for (std::vector<PaneRec>::iterator i = m_panes.begin();
         i != m_panes.end(); ++i) {
        i->propertyStack->setMinimumWidth(mw);
    }
    m_propertyStackMinWidth = mw;
}

void
PaneStack::setLayoutStyle(LayoutStyle style)
{
    if (style == m_layoutStyle) return;
    m_layoutStyle = style;

    std::vector<PaneRec>::iterator i;

    switch (style) {

    case NoPropertyStacks:
    case SinglePropertyStackLayout:
        
        for (i = m_panes.begin(); i != m_panes.end(); ++i) {
            i->layout->removeWidget(i->propertyStack);
            i->propertyStack->setParent(m_propertyStackStack);
            m_propertyStackStack->addWidget(i->propertyStack);
        }
        m_propertyStackStack->setVisible(style != NoPropertyStacks);
        break;

    case PropertyStackPerPaneLayout:

        for (i = m_panes.begin(); i != m_panes.end(); ++i) {
            m_propertyStackStack->removeWidget(i->propertyStack);
            i->propertyStack->setParent(i->frame);
            i->layout->addWidget(i->propertyStack);
            i->propertyStack->show();
        }
        m_propertyStackStack->hide();
        break;
    }
}

Pane *
PaneStack::getPane(int n)
{
    if (n < m_panes.size()) {
        return m_panes[n].pane;
    } else {
        return 0;
    }
}

int
PaneStack::getPaneIndex(Pane *pane)
{
    for (int i = 0; i < getPaneCount(); ++i) {
        if (pane == getPane(i)) {
            return i;
        }
    }
    return -1;
}

Pane *
PaneStack::getHiddenPane(int n)
{
    return m_hiddenPanes[n].pane;
}

void
PaneStack::deletePane(Pane *pane)
{
    std::vector<PaneRec>::iterator i;
    bool found = false;

    for (i = m_panes.begin(); i != m_panes.end(); ++i) {
	if (i->pane == pane) {
	    m_panes.erase(i);
	    found = true;
	    break;
	}
    }

    if (!found) {

	for (i = m_hiddenPanes.begin(); i != m_hiddenPanes.end(); ++i) {
	    if (i->pane == pane) {
		m_hiddenPanes.erase(i);
		found = true;
		break;
	    }
	}

	if (!found) {
	    std::cerr << "WARNING: PaneStack::deletePane(" << pane << "): Pane not found in visible or hidden panes, not deleting" << std::endl;
	    return;
	}
    }

    emit paneAboutToBeDeleted(pane);

    delete pane->parent();

    if (m_currentPane == pane) {
	if (m_panes.size() > 0) {
            setCurrentPane(m_panes[0].pane);
	} else {
	    setCurrentPane(0);
	}
    }

    emit paneDeleted();
}

int
PaneStack::getPaneCount() const
{
    return m_panes.size();
}

int
PaneStack::getHiddenPaneCount() const
{
    return m_hiddenPanes.size();
}

void
PaneStack::hidePane(Pane *pane)
{
    std::vector<PaneRec>::iterator i = m_panes.begin();

    while (i != m_panes.end()) {
	if (i->pane == pane) {

	    m_hiddenPanes.push_back(*i);
	    m_panes.erase(i);

	    QWidget *pw = dynamic_cast<QWidget *>(pane->parent());
	    if (pw) pw->hide();

	    if (m_currentPane == pane) {
		if (m_panes.size() > 0) {
		    setCurrentPane(m_panes[0].pane);
		} else {
		    setCurrentPane(0);
		}
	    }
	    
	    return;
	}
	++i;
    }

    std::cerr << "WARNING: PaneStack::hidePane(" << pane << "): Pane not found in visible panes" << std::endl;
}

void
PaneStack::showPane(Pane *pane)
{
    std::vector<PaneRec>::iterator i = m_hiddenPanes.begin();

    while (i != m_hiddenPanes.end()) {
	if (i->pane == pane) {
	    m_panes.push_back(*i);
	    m_hiddenPanes.erase(i);
	    QWidget *pw = dynamic_cast<QWidget *>(pane->parent());
	    if (pw) pw->show();

	    //!!! update current pane

	    return;
	}
	++i;
    }

    std::cerr << "WARNING: PaneStack::showPane(" << pane << "): Pane not found in hidden panes" << std::endl;
}

void
PaneStack::setCurrentPane(Pane *pane) // may be null
{
    if (m_currentPane == pane) return;
    
    std::vector<PaneRec>::iterator i = m_panes.begin();

    // We used to do this by setting the foreground and background
    // role, but it seems the background role is ignored and the
    // background drawn transparent in Qt 4.1 -- I can't quite see why
    
    QPixmap selectedMap(1, 1);
    selectedMap.fill(QApplication::palette().color(QPalette::Foreground));
    
    QPixmap unselectedMap(1, 1);
    unselectedMap.fill(QApplication::palette().color(QPalette::Background));

    bool found = false;

    while (i != m_panes.end()) {
	if (i->pane == pane) {
	    i->currentIndicator->setPixmap(selectedMap);
            if (m_layoutStyle != PropertyStackPerPaneLayout) {
                m_propertyStackStack->setCurrentWidget(i->propertyStack);
            }
	    found = true;
	} else {
	    i->currentIndicator->setPixmap(unselectedMap);
	}
	++i;
    }

    if (found || pane == 0) {
	m_currentPane = pane;
	emit currentPaneChanged(m_currentPane);
    } else {
	std::cerr << "WARNING: PaneStack::setCurrentPane(" << pane << "): pane is not a visible pane in this stack" << std::endl;
    }
}

void
PaneStack::setCurrentLayer(Pane *pane, Layer *layer) // may be null
{
    setCurrentPane(pane);

    if (m_currentPane) {

	std::vector<PaneRec>::iterator i = m_panes.begin();

	while (i != m_panes.end()) {

	    if (i->pane == pane) {
		PropertyStack *stack = dynamic_cast<PropertyStack *>
		    (i->propertyStack);
		if (stack) {
		    if (stack->containsContainer(layer)) {
			stack->setCurrentIndex(stack->getContainerIndex(layer));
			emit currentLayerChanged(pane, layer);
		    } else {
			stack->setCurrentIndex
			    (stack->getContainerIndex
			     (pane->getPropertyContainer(0)));
			emit currentLayerChanged(pane, 0);
		    }
		}
		break;
	    }
	    ++i;
	}
    }
}

Pane *
PaneStack::getCurrentPane() 
{
    return m_currentPane;
}

void
PaneStack::propertyContainerAdded(PropertyContainer *)
{
    sizePropertyStacks();
}

void
PaneStack::propertyContainerRemoved(PropertyContainer *)
{
    sizePropertyStacks();
}

void
PaneStack::propertyContainerSelected(View *client, PropertyContainer *pc)
{
    std::vector<PaneRec>::iterator i = m_panes.begin();

    while (i != m_panes.end()) {
	PropertyStack *stack = dynamic_cast<PropertyStack *>(i->propertyStack);
	if (stack &&
	    stack->getClient() == client &&
	    stack->containsContainer(pc)) {
	    setCurrentPane(i->pane);
	    break;
	}
	++i;
    }

    Layer *layer = dynamic_cast<Layer *>(pc);
    if (layer) emit currentLayerChanged(m_currentPane, layer);
    else emit currentLayerChanged(m_currentPane, 0);
}

void
PaneStack::viewSelected(View *v)
{
    Pane *p = dynamic_cast<Pane *>(v);
    if (p) setCurrentPane(p);
}

void
PaneStack::paneInteractedWith()
{
    Pane *pane = dynamic_cast<Pane *>(sender());
    if (!pane) return;
    setCurrentPane(pane);
}

void
PaneStack::rightButtonMenuRequested(QPoint position)
{
    Pane *pane = dynamic_cast<Pane *>(sender());
    if (!pane) return;
    emit rightButtonMenuRequested(pane, position);
}

void
PaneStack::sizePropertyStacks()
{
    int maxMinWidth = 0;

    if (m_propertyStackMinWidth > 0) maxMinWidth = m_propertyStackMinWidth;

    for (size_t i = 0; i < m_panes.size(); ++i) {
	if (!m_panes[i].propertyStack) continue;
#ifdef DEBUG_PANE_STACK
	std::cerr << "PaneStack::sizePropertyStacks: " << i << ": min " 
		  << m_panes[i].propertyStack->minimumSizeHint().width() << ", hint "
                  << m_panes[i].propertyStack->sizeHint().width() << ", current "
		  << m_panes[i].propertyStack->width() << std::endl;
#endif

	if (m_panes[i].propertyStack->sizeHint().width() > maxMinWidth) {
	    maxMinWidth = m_panes[i].propertyStack->sizeHint().width();
	}
    }

#ifdef DEBUG_PANE_STACK
    std::cerr << "PaneStack::sizePropertyStacks: max min width " << maxMinWidth << std::endl;
#endif

//#ifdef Q_WS_MAC
    // This is necessary to compensate for cb->setMinimumSize(10, 10)
    // in PropertyBox in the Mac version (to avoid a mysterious crash)
    // ... no longer necessary with qt4.2
//    int setWidth = maxMinWidth * 3 / 2;
//#else
    int setWidth = maxMinWidth;
//#endif

    m_propertyStackStack->setMaximumWidth(setWidth + 10);

    for (size_t i = 0; i < m_panes.size(); ++i) {
	if (!m_panes[i].propertyStack) continue;
	m_panes[i].propertyStack->setMinimumWidth(setWidth);
    }

    emit propertyStacksResized();
}
    
void
PaneStack::paneDropAccepted(QStringList uriList)
{
    Pane *pane = dynamic_cast<Pane *>(sender());
    emit dropAccepted(pane, uriList);
}
    
void
PaneStack::paneDropAccepted(QString text)
{
    Pane *pane = dynamic_cast<Pane *>(sender());
    emit dropAccepted(pane, text);
}