view view/PaneStack.cpp @ 235:efadb9d2b2c6

* Experiment with sizing the property stacks and using a frame on the overview
  widget with an eye to making the default empty window look a bit nicer

/* -*- 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>

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)));

    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)
{
    return m_panes[n].pane;
}

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;
	}
    }

    delete pane->parent();

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

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;
//	std::cerr << "PaneStack::sizePropertyStacks: " << i << ": min " 
//		  << m_panes[i].propertyStack->minimumSizeHint().width() << ", current "
//		  << m_panes[i].propertyStack->width() << std::endl;

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

//    std::cerr << "PaneStack::sizePropertyStacks: max min width " << maxMinWidth << std::endl;

#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)

    //!!! is this still 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();
}