kmultitabbar.cpp

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/***************************************************************************
                          kmultitabbar.cpp -  description
                             -------------------
    begin                :  2001
    copyright            : (C) 2001,2002,2003 by Joseph Wenninger <jowenn@kde.org>
 ***************************************************************************/

/***************************************************************************
    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Library General Public
    License as published by the Free Software Foundation; either
    version 2 of the License, or (at your option) any later version.

    This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    Library General Public License for more details.

    You should have received a copy of the GNU Library General Public License
    along with this library; see the file COPYING.LIB.  If not, write to
    the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
    Boston, MA 02110-1301, USA.
 ***************************************************************************/

#include "kmultitabbar.h"
#include "kmultitabbar_p.h"
#include "kmultitabbar.moc"
#include "kmultitabbar_p.moc"

#include <QtGui/QActionEvent>
#include <QtGui/QLayout>
#include <QtGui/QPainter>
#include <QtGui/QFontMetrics>
#include <QtGui/QStyle>
#include <QStyleOptionButton>

#include <kiconloader.h>
#include <kdebug.h>
#include <QtGui/QApplication>
#include <math.h>

class KMultiTabBarPrivate
{
public:
    class KMultiTabBarInternal *m_internal;
    QBoxLayout *m_l;
    QFrame *m_btnTabSep;
    QList<KMultiTabBarButton*> m_buttons;
    KMultiTabBar::KMultiTabBarPosition m_position;
};


KMultiTabBarInternal::KMultiTabBarInternal(QWidget *parent, KMultiTabBar::KMultiTabBarPosition pos):QFrame(parent)
{
    m_position = pos;
    if (pos == KMultiTabBar::Left || pos == KMultiTabBar::Right)
        mainLayout=new QVBoxLayout(this);
    else
        mainLayout=new QHBoxLayout(this);
    mainLayout->setMargin(0);
    mainLayout->setSpacing(0);
    mainLayout->addStretch();
    setFrameStyle(NoFrame);
    setBackgroundRole(QPalette::Background);
}

KMultiTabBarInternal::~KMultiTabBarInternal()
{
    qDeleteAll(m_tabs);
    m_tabs.clear();
}

void KMultiTabBarInternal::setStyle(enum KMultiTabBar::KMultiTabBarStyle style)
{
    m_style=style;
    for (int i=0;i<m_tabs.count();i++)
        m_tabs.at(i)->setStyle(m_style);

    updateGeometry();
}

void KMultiTabBarInternal::contentsMousePressEvent(QMouseEvent *ev)
{
    ev->ignore();
}

void KMultiTabBarInternal::mousePressEvent(QMouseEvent *ev)
{
    ev->ignore();
}

KMultiTabBarTab* KMultiTabBarInternal::tab(int id) const
{
    QListIterator<KMultiTabBarTab*> it(m_tabs);
    while (it.hasNext()) {
        KMultiTabBarTab *tab = it.next();
        if (tab->id()==id) return tab;
    }
    return 0;
}

int KMultiTabBarInternal::appendTab(const QPixmap &pic, int id, const QString& text)
{
    KMultiTabBarTab  *tab;
    m_tabs.append(tab= new KMultiTabBarTab(pic,text,id,this,m_position,m_style));

    // Insert before the stretch..
    mainLayout->insertWidget(m_tabs.size()-1, tab);
    tab->show();
    return 0;
}

void KMultiTabBarInternal::removeTab(int id)
{
    for (int pos=0;pos<m_tabs.count();pos++)
    {
        if (m_tabs.at(pos)->id()==id)
        {
            // remove & delete the tab
            delete m_tabs.takeAt(pos);
            break;
        }
    }
}

void KMultiTabBarInternal::setPosition(enum KMultiTabBar::KMultiTabBarPosition pos)
{
    m_position=pos;
    for (int i=0;i<m_tabs.count();i++)
        m_tabs.at(i)->setPosition(m_position);
    updateGeometry();
}

// KMultiTabBarButton

KMultiTabBarButton::KMultiTabBarButton(const QPixmap& pic, const QString& text,
                                       int id, QWidget *parent)
    : QPushButton(QIcon(pic), text, parent), m_id(id), d(0)
{
    connect(this,SIGNAL(clicked()),this,SLOT(slotClicked()));

    // we can't see the focus, so don't take focus. #45557
    // If keyboard navigation is wanted, then only the bar should take focus,
    // and arrows could change the focused button; but generally, tabbars don't take focus anyway.
    setFocusPolicy(Qt::NoFocus);
}

KMultiTabBarButton::~KMultiTabBarButton()
{
}

void KMultiTabBarButton::setText(const QString &text)
{
    QPushButton::setText(text);
}

void KMultiTabBarButton::slotClicked()
{
    updateGeometry();
    emit clicked(m_id);
}

int KMultiTabBarButton::id() const
{
    return m_id;
}

void KMultiTabBarButton::hideEvent( QHideEvent* he) {
    QPushButton::hideEvent(he);
    KMultiTabBar *tb=dynamic_cast<KMultiTabBar*>(parentWidget());
    if (tb) tb->updateSeparator();
}

void KMultiTabBarButton::showEvent( QShowEvent* he) {
    QPushButton::showEvent(he);
    KMultiTabBar *tb=dynamic_cast<KMultiTabBar*>(parentWidget());
    if (tb) tb->updateSeparator();
}

void KMultiTabBarButton::paintEvent(QPaintEvent *) {
        QStyleOptionButton opt;
    opt.initFrom(this);
    opt.icon = icon();
    opt.iconSize = iconSize();
    // removes the QStyleOptionButton::HasMenu ButtonFeature
    opt.features = QStyleOptionButton::Flat;
    QPainter painter(this);
    style()->drawControl(QStyle::CE_PushButton, &opt, &painter, this);
}

// KMultiTabBarTab

KMultiTabBarTab::KMultiTabBarTab(const QPixmap& pic, const QString& text,
                                       int id, QWidget *parent,
                                       KMultiTabBar::KMultiTabBarPosition pos,
                                       KMultiTabBar::KMultiTabBarStyle style)
    : KMultiTabBarButton(pic, text, id, parent), m_style(style), d(0)
{
    m_position=pos;
    setToolTip(text);
    setCheckable(true);
    setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Preferred);
     // shrink down to icon only, but prefer to show text if it's there
}

KMultiTabBarTab::~KMultiTabBarTab()
{
}

void KMultiTabBarTab::setPosition(KMultiTabBar::KMultiTabBarPosition pos)
{
    m_position=pos;
    updateGeometry();
}

void KMultiTabBarTab::setStyle(KMultiTabBar::KMultiTabBarStyle style)
{
    m_style=style;
    updateGeometry();
}

QPixmap KMultiTabBarTab::iconPixmap() const
{
    int iconSize = style()->pixelMetric(QStyle::PM_SmallIconSize, 0, this);
    return icon().pixmap(iconSize);
}

void KMultiTabBarTab::initStyleOption(QStyleOptionToolButton* opt) const
{
    opt->initFrom(this);

    // Setup icon..
    if (!icon().isNull()) {
        opt->iconSize = iconPixmap().size();
        opt->icon     = icon();
    }

    // Should we draw text?
    if (shouldDrawText())
        opt->text = text();

    opt->state |= QStyle::State_AutoRaise;
    if (underMouse())
        opt->state |= QStyle::State_MouseOver | QStyle::State_Raised;

    if (isChecked())
        opt->state |= QStyle::State_Sunken | QStyle::State_On;

    opt->font = font();
    opt->toolButtonStyle = shouldDrawText() ? Qt::ToolButtonTextBesideIcon : Qt::ToolButtonIconOnly;
    opt->subControls = QStyle::SC_ToolButton;
}

QSize KMultiTabBarTab::sizeHint() const
{
    return computeSizeHint(shouldDrawText());
}

QSize KMultiTabBarTab::minimumSizeHint() const
{
    return computeSizeHint(false);
}

void KMultiTabBarTab::computeMargins(int* hMargin, int* vMargin) const
{
    // Unfortunately, QStyle does not give us enough information to figure out
    // where to place things, so we try to reverse-engineer it
    QStyleOptionToolButton opt;
    initStyleOption(&opt);

    QPixmap iconPix = iconPixmap();
    QSize trialSize = iconPix.size();
    QSize expandSize = style()->sizeFromContents(QStyle::CT_ToolButton, &opt, trialSize, this);

    *hMargin = (expandSize.width()  - trialSize.width())/2;
    *vMargin = (expandSize.height() - trialSize.height())/2;
}

QSize KMultiTabBarTab::computeSizeHint(bool withText) const
{
    // Compute as horizontal first, then flip around if need be.
    QStyleOptionToolButton opt;
    initStyleOption(&opt);

    int hMargin, vMargin;
    computeMargins(&hMargin, &vMargin);

    // Compute interior size, starting from pixmap..
    QPixmap iconPix = iconPixmap();
    QSize size = iconPix.size();

    // Always include text height in computation, to avoid resizing the minor direction
    // when expanding text..
    QSize textSize = fontMetrics().size(0, text());
    size.setHeight(qMax(size.height(), textSize.height()));

    // Pick margins for major/minor direction, depending on orientation
    int majorMargin = isVertical() ? vMargin : hMargin;
    int minorMargin = isVertical() ? hMargin : vMargin;

    size.setWidth (size.width()  + 2*majorMargin);
    size.setHeight(size.height() + 2*minorMargin);

    if (withText)
        // Add enough room for the text, and an extra major margin.
        size.setWidth(size.width() + textSize.width() + majorMargin);

    // flip time?
    if (isVertical())
        return QSize(size.height(), size.width());
    else
        return size;
}

void KMultiTabBarTab::setState(bool newState)
{
    setChecked(newState);
    updateGeometry();
}

void KMultiTabBarTab::setIcon(const QString& icon)
{
    QPixmap pic=SmallIcon(icon);
    setIcon(pic);
}

void KMultiTabBarTab::setIcon(const QPixmap& icon)
{
    QPushButton::setIcon(icon);
}

bool KMultiTabBarTab::shouldDrawText() const
{
    return (m_style==KMultiTabBar::KDEV3ICON) || isChecked();
}

bool KMultiTabBarTab::isVertical() const
{
    return m_position==KMultiTabBar::Right || m_position==KMultiTabBar::Left;
}

void KMultiTabBarTab::paintEvent(QPaintEvent*) {
    QPainter painter(this);

    QStyleOptionToolButton opt;
    initStyleOption(&opt);

    // Paint bevel..
    if (underMouse() || isChecked()) {
        opt.text.clear();
        opt.icon = QIcon();
        style()->drawComplexControl(QStyle::CC_ToolButton, &opt, &painter, this);
    }

    int hMargin, vMargin;
    computeMargins(&hMargin, &vMargin);

    // We first figure out how much room we have for the text, based on
    // icon size and margin, try to fit in by eliding, and perhaps
    // give up on drawing the text entirely if we're too short on room
    QPixmap icon = iconPixmap();
    int textRoom = 0;
    int iconRoom = 0;

    QString t;
    if (shouldDrawText()) {
        if (isVertical()) {
            iconRoom = icon.height() + 2*vMargin;
            textRoom = height() - iconRoom - vMargin;
        } else {
            iconRoom = icon.width() + 2*hMargin;
            textRoom = width() - iconRoom - hMargin;
        }

        t = painter.fontMetrics().elidedText(text(), Qt::ElideRight, textRoom);

        // See whether anything is left. Qt will return either
        // ... or the ellipsis unicode character, 0x2026
        if (t == QLatin1String("...") || t == QChar(0x2026))
            t.clear();
    }

    // Label time.... Simple case: no text, so just plop down the icon right in the center
    // We only do this when the button never draws the text, to avoid jumps in icon position
    // when resizing
    if (!shouldDrawText()) {
        style()->drawItemPixmap(&painter, rect(), Qt::AlignCenter | Qt::AlignVCenter, icon);
        return;
    }

    // Now where the icon/text goes depends on text direction and tab position
    QRect iconArea;
    QRect labelArea;

    bool bottomIcon = false;
    bool rtl = layoutDirection() == Qt::RightToLeft;
    if (isVertical()) {
        if (m_position == KMultiTabBar::Left && !rtl)
            bottomIcon = true;
        if (m_position == KMultiTabBar::Right && rtl)
            bottomIcon = true;
    }
    //alignFlags = Qt::AlignLeading | Qt::AlignVCenter;

    if (isVertical()) {
        if (bottomIcon) {
            labelArea = QRect(0, vMargin, width(), textRoom);
            iconArea  = QRect(0, vMargin + textRoom, width(), iconRoom);
        } else {
            labelArea = QRect(0, iconRoom, width(), textRoom);
            iconArea  = QRect(0, 0, width(), iconRoom);
        }
    } else {
        // Pretty simple --- depends only on RTL/LTR
        if (rtl) {
            labelArea = QRect(hMargin, 0, textRoom, height());
            iconArea  = QRect(hMargin + textRoom, 0, iconRoom, height());
        } else {
            labelArea = QRect(iconRoom, 0, textRoom, height());
            iconArea  = QRect(0, 0, iconRoom, height());
        }
    }

    style()->drawItemPixmap(&painter, iconArea, Qt::AlignCenter | Qt::AlignVCenter, icon);

    if (t.isEmpty())
        return;

    QRect labelPaintArea = labelArea;

    if (isVertical()) {
        // If we're vertical, we paint to a simple 0,0 origin rect,
        // and get the transformations to get us in the right place
        labelPaintArea = QRect(0, 0, labelArea.height(), labelArea.width());

        QTransform tr;

        if (bottomIcon) {
            tr.translate(labelArea.x(), labelPaintArea.width() + labelArea.y());
            tr.rotate(-90);
        } else {
            tr.translate(labelPaintArea.height() + labelArea.x(), labelArea.y());
            tr.rotate(90);
        }
        painter.setTransform(tr);
    }

    style()->drawItemText(&painter, labelPaintArea, Qt::AlignLeading | Qt::AlignVCenter,
                          palette(), true, t, QPalette::ButtonText);
}

// KMultiTabBar

KMultiTabBar::KMultiTabBar(KMultiTabBarPosition pos, QWidget *parent)
    : QWidget(parent),
    d(new KMultiTabBarPrivate)
{
    if (pos == Left || pos == Right)
    {
        d->m_l=new QVBoxLayout(this);
        setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Expanding/*, true*/);
    }
    else
    {
        d->m_l=new QHBoxLayout(this);
        setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Fixed/*, true*/);
    }
    d->m_l->setMargin(0);
    d->m_l->setSpacing(0);

    d->m_internal=new KMultiTabBarInternal(this, pos);
    setPosition(pos);
    setStyle(VSNET);
    d->m_l->insertWidget(0,d->m_internal);
    d->m_l->insertWidget(0,d->m_btnTabSep=new QFrame(this));
    d->m_btnTabSep->setFixedHeight(4);
    d->m_btnTabSep->setFrameStyle(QFrame::Panel | QFrame::Sunken);
    d->m_btnTabSep->setLineWidth(2);
    d->m_btnTabSep->hide();

    updateGeometry();
}

KMultiTabBar::~KMultiTabBar()
{
    qDeleteAll( d->m_buttons );
    d->m_buttons.clear();
    delete d;
}

int KMultiTabBar::appendButton(const QPixmap &pic, int id, QMenu *popup, const QString&)
{
    KMultiTabBarButton *btn = new KMultiTabBarButton(pic, QString(), id, this);
    // a button with a QMenu can have another size. Make sure the button has always the same size.
    btn->setFixedWidth(btn->height());
    btn->setMenu(popup);
    d->m_buttons.append(btn);
    d->m_l->insertWidget(0,btn);
    btn->show();
    d->m_btnTabSep->show();
    return 0;
}

void KMultiTabBar::updateSeparator() {
    bool hideSep=true;
    QListIterator<KMultiTabBarButton*> it(d->m_buttons);
    while (it.hasNext()){
        if (it.next()->isVisibleTo(this)) {
            hideSep=false;
            break;
        }
    }
    if (hideSep)
        d->m_btnTabSep->hide();
    else
        d->m_btnTabSep->show();
}

int KMultiTabBar::appendTab(const QPixmap &pic, int id, const QString& text)
{
    d->m_internal->appendTab(pic,id,text);
    return 0;
}

KMultiTabBarButton* KMultiTabBar::button(int id) const
{
    QListIterator<KMultiTabBarButton*> it(d->m_buttons);
    while ( it.hasNext() ) {
        KMultiTabBarButton *button = it.next();
        if ( button->id() == id )
            return button;
    }

    return 0;
}

KMultiTabBarTab* KMultiTabBar::tab(int id) const
{
    return d->m_internal->tab(id);
}

void KMultiTabBar::removeButton(int id)
{
    for (int pos=0;pos<d->m_buttons.count();pos++)
    {
        if (d->m_buttons.at(pos)->id()==id)
        {
            d->m_buttons.takeAt(pos)->deleteLater();
            break;
        }
    }

    if (d->m_buttons.count()==0)
        d->m_btnTabSep->hide();
}

void KMultiTabBar::removeTab(int id)
{
    d->m_internal->removeTab(id);
}

void KMultiTabBar::setTab(int id,bool state)
{
    KMultiTabBarTab *ttab=tab(id);
    if (ttab)
        ttab->setState(state);
}

bool KMultiTabBar::isTabRaised(int id) const
{
    KMultiTabBarTab *ttab=tab(id);
    if (ttab)
        return ttab->isChecked();

    return false;
}

void KMultiTabBar::setStyle(KMultiTabBarStyle style)
{
    d->m_internal->setStyle(style);
}

KMultiTabBar::KMultiTabBarStyle KMultiTabBar::tabStyle() const
{
    return d->m_internal->m_style;
}

void KMultiTabBar::setPosition(KMultiTabBarPosition pos)
{
    d->m_position=pos;
    d->m_internal->setPosition(pos);
}

KMultiTabBar::KMultiTabBarPosition KMultiTabBar::position() const
{
    return d->m_position;
}

void KMultiTabBar::fontChange(const QFont& /* oldFont */)
{
    updateGeometry();
}

// vim: ts=4 sw=4 noet
// kate: indent-width 4; replace-tabs off; tab-width 4; space-indent off;