plasma-framework/private/nativetabbar.cpp
Marco Martin 65a85e7a3d fade out the tabs text at the edges of the tabbar if the tabs are too
many for the space 

svn path=/trunk/KDE/kdelibs/; revision=1028649
2009-09-27 20:23:13 +00:00

563 lines
16 KiB
C++

/*
Copyright 2007 Robert Knight <robertknight@gmail.com>
Copyright 2008 Marco Martin <notmart@gmail.com>
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.
*/
// Own
#include "nativetabbar_p.h"
// Qt
#include <QIcon>
#include <QMouseEvent>
#include <QPainter>
#include <QApplication>
#include <QStyleOption>
#include <QToolButton>
#include <QGradient>
#include <QLinearGradient>
// KDE
#include <kdebug.h>
#include <kcolorutils.h>
#include <kicon.h>
#include <kiconloader.h>
#include "plasma/plasma.h"
#include "plasma/theme.h"
#include "plasma/animator.h"
#include "plasma/framesvg.h"
#include "plasma/paintutils.h"
//#include "private/style_p.h"
namespace Plasma
{
class NativeTabBarPrivate
{
public:
NativeTabBarPrivate(NativeTabBar *parent)
: q(parent),
shape(NativeTabBar::RoundedNorth),
backgroundSvg(0),
buttonSvg(0),
closeIcon("window-close"),
animationId(-1),
mousePressOffset(0)
{
}
~NativeTabBarPrivate()
{
delete backgroundSvg;
delete buttonSvg;
}
void syncBorders();
void storeLastIndex();
NativeTabBar *q;
QTabBar::Shape shape; //used to keep track of shape() changes
FrameSvg *backgroundSvg;
qreal left, top, right, bottom;
FrameSvg *buttonSvg;
qreal buttonLeft, buttonTop, buttonRight, buttonBottom;
KIcon closeIcon;
int animationId;
QRect currentAnimRect;
QRect startAnimRect;
int mousePressOffset;
int lastIndex[2];
qreal animProgress;
};
void NativeTabBarPrivate::syncBorders()
{
backgroundSvg->getMargins(left, top, right, bottom);
buttonSvg->getMargins(buttonLeft, buttonTop, buttonRight, buttonBottom);
}
void NativeTabBarPrivate::storeLastIndex()
{
// if first run
if (lastIndex[0] == -1) {
lastIndex[1] = q->currentIndex();
}
lastIndex[0] = lastIndex[1];
lastIndex[1] = q->currentIndex();
}
NativeTabBar::NativeTabBar(QWidget *parent)
: KTabBar(parent),
d(new NativeTabBarPrivate(this))
{
d->backgroundSvg = new Plasma::FrameSvg();
d->backgroundSvg->setImagePath("widgets/frame");
d->backgroundSvg->setElementPrefix("sunken");
d->buttonSvg = new Plasma::FrameSvg();
d->buttonSvg->setImagePath("widgets/button");
d->buttonSvg->setElementPrefix("normal");
d->syncBorders();
d->lastIndex[0] = -1;
connect(this, SIGNAL(currentChanged(int)), this, SLOT(startAnimation()));
setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
}
NativeTabBar::~NativeTabBar()
{
delete d;
}
QRect NativeTabBar::tabRect(int index) const
{
QRect rect = KTabBar::tabRect(index).translated(d->left, d->top);
if (isVertical()) {
rect.setWidth(width() - d->left - d->right);
if (index == count() - 1) {
rect.adjust(0, 0, 0, -d->bottom);
}
} else {
rect.setHeight(height() - d->top- d->bottom);
if (index == count() - 1) {
rect.adjust(0, 0, -d->right, 0);
}
}
return rect;
}
int NativeTabBar::lastIndex() const
{
return d->lastIndex[0];
}
QSize NativeTabBar::tabSizeHint(int index) const
{
//return KTabBar::tabSizeHint(index);
QSize hint = tabSize(index);
int minwidth = 0;
int minheight = 0;
int maxwidth = 0;
Shape s = shape();
switch (s) {
case RoundedSouth:
case TriangularSouth:
case RoundedNorth:
case TriangularNorth:
if (count() > 0) {
for (int i = count() - 1; i >= 0; i--) {
minwidth += tabSize(i).width();
}
if (minwidth < width() - d->left - d->right) {
hint.rwidth() += (width() - d->left - d->right - minwidth) / count();
}
}
break;
case RoundedWest:
case TriangularWest:
case RoundedEast:
case TriangularEast:
if (count() > 0) {
for (int i = count() - 1; i >= 0; i--) {
minheight += tabSize(i).height();
if (tabSize(i).width() > maxwidth) {
maxwidth = tabSize(i).width();
}
}
if (minheight < height()) {
hint.rheight() += (height() - minheight) / count();
}
}
break;
}
return hint;
}
QSize NativeTabBar::sizeHint() const
{
return KTabBar::sizeHint();
}
void NativeTabBar::paintEvent(QPaintEvent *event)
{
if (!styleSheet().isNull()) {
KTabBar::paintEvent(event);
return;
}
QPainter painter(this);
//int numTabs = count();
//bool ltr = painter.layoutDirection() == Qt::LeftToRight; // Not yet used
if (drawBase()) {
d->backgroundSvg->paintFrame(&painter);
}
// Drawing Tabborders
QRect movingRect;
if (d->currentAnimRect.isNull()) {
movingRect = tabRect(currentIndex());
} else {
movingRect = d->currentAnimRect;
}
//resizing here because in resizeevent the first time is invalid (still no tabs)
d->buttonSvg->resizeFrame(movingRect.size());
d->buttonSvg->paintFrame(&painter, movingRect.topLeft());
QFontMetrics metrics(painter.font());
QRect scrollButtonsRect;
foreach (QObject *child, children()) {
QToolButton *childWidget = qobject_cast<QToolButton *>(child);
if (childWidget) {
if (!childWidget->isVisible()) {
continue;
}
if (scrollButtonsRect.isValid()) {
scrollButtonsRect = scrollButtonsRect.united(childWidget->geometry());
} else {
scrollButtonsRect = childWidget->geometry();
}
}
}
for (int i = 0; i < count(); ++i) {
QRect rect = tabRect(i).adjusted(d->buttonLeft, d->buttonTop,
-d->buttonRight, -d->buttonBottom);
// draw tab icon
QRect iconRect = QRect(rect.x(), rect.y(), iconSize().width(), iconSize().height());
iconRect.moveCenter(QPoint(iconRect.center().x(), rect.center().y()));
tabIcon(i).paint(&painter, iconRect);
// draw tab text
if (i == currentIndex() && d->animProgress == 1) {
painter.setPen(Plasma::Theme::defaultTheme()->color(Theme::ButtonTextColor));
} else {
QColor color(Plasma::Theme::defaultTheme()->color(Theme::TextColor));
if (!isTabEnabled(i)) {
color.setAlpha(140);
}
painter.setPen(color);
}
QRect textRect = rect;
if (!tabIcon(i).isNull()) {
textRect.setLeft(iconRect.right());
}
painter.setFont(Plasma::Theme::defaultTheme()->font(Plasma::Theme::DefaultFont));
int endTabSpace = contentsRect().right() - scrollButtonsRect.width();
if (textRect.left() < endTabSpace) {
if (textRect.left() < contentsRect().left() || textRect.right() > endTabSpace) {
QPixmap buffer(textRect.size());
buffer.fill(Qt::transparent);
QPainter buffPainter(&buffer);
buffPainter.drawText(buffer.rect(), Qt::AlignCenter | Qt::TextHideMnemonic, tabText(i));
buffPainter.setCompositionMode(QPainter::CompositionMode_DestinationIn);
QLinearGradient gradient(buffer.rect().topLeft(), buffer.rect().topRight());
if (textRect.left() < contentsRect().left()) {
gradient.setColorAt(0, Qt::transparent);
gradient.setColorAt((-(qreal)textRect.left())/(qreal)textRect.width(), Qt::transparent);
gradient.setColorAt(1, Qt::black);
} else {
gradient.setColorAt(0, Qt::black);
gradient.setColorAt(1 - (qreal)(textRect.right() - endTabSpace)/(qreal)textRect.width(), Qt::transparent);
gradient.setColorAt(1, Qt::transparent);
}
buffPainter.setBrush(gradient);
buffPainter.setPen(Qt::NoPen);
buffPainter.drawRect(buffer.rect());
buffPainter.end();
painter.drawPixmap(textRect, buffer, buffer.rect());
} else {
painter.drawText(textRect, Qt::AlignCenter | Qt::TextHideMnemonic, tabText(i));
}
}
if (isCloseButtonEnabled()) {
d->closeIcon.paint(&painter, QRect(closeButtonPos(i), QSize(KIconLoader::SizeSmall, KIconLoader::SizeSmall)) );
}
}
if (scrollButtonsRect.isValid()) {
scrollButtonsRect.adjust(2, 4, -2, -4);
painter.save();
QColor background(Plasma::Theme::defaultTheme()->color(Theme::BackgroundColor));
background.setAlphaF(0.75);
painter.setRenderHint(QPainter::Antialiasing);
painter.fillPath(PaintUtils::roundedRectangle(scrollButtonsRect, 5), background);
painter.restore();
QStyleOption so;
so.initFrom(this);
so.palette.setColor(QPalette::ButtonText,
Plasma::Theme::defaultTheme()->color(Theme::TextColor));
so.rect = scrollButtonsRect.adjusted(0, 0, -scrollButtonsRect.width() / 2, 0);
style()->drawPrimitive(QStyle::PE_IndicatorArrowLeft, &so, &painter, this);
so.rect = scrollButtonsRect.adjusted(scrollButtonsRect.width() / 2, 0, 0, 0);
style()->drawPrimitive(QStyle::PE_IndicatorArrowRight, &so, &painter, this);
}
}
void NativeTabBar::resizeEvent(QResizeEvent *event)
{
KTabBar::resizeEvent(event);
d->currentAnimRect = tabRect(currentIndex());
d->backgroundSvg->resizeFrame(size());
d->syncBorders();
update();
}
void NativeTabBar::tabInserted(int index)
{
KTabBar::tabInserted(index);
emit sizeHintChanged();
}
void NativeTabBar::tabRemoved(int index)
{
KTabBar::tabRemoved(index);
emit sizeHintChanged();
}
void NativeTabBar::tabLayoutChange()
{
KTabBar::tabLayoutChange();
if (shape() != d->shape) {
d->shape = shape();
emit shapeChanged(d->shape);
}
}
void NativeTabBar::startAnimation()
{
d->storeLastIndex();
Plasma::Animator::self()->customAnimation(
10, 150, Plasma::Animator::EaseInOutCurve, this, "onValueChanged");
}
void NativeTabBar::onValueChanged(qreal value)
{
if ((d->animProgress = value) == 1.0) {
animationFinished();
return;
}
// animation rect
QRect rect = tabRect(currentIndex());
QRect lastRect = d->startAnimRect.isNull() ? tabRect(lastIndex())
: d->startAnimRect;
int x = isHorizontal() ? (int)(lastRect.x() - value * (lastRect.x() - rect.x())) : rect.x();
int y = isHorizontal() ? rect.y() : (int)(lastRect.y() - value * (lastRect.y() - rect.y()));
QSizeF sz = lastRect.size() - value * (lastRect.size() - rect.size());
d->currentAnimRect = QRect(x, y, (int)(sz.width()), (int)(sz.height()));
update();
}
void NativeTabBar::animationFinished()
{
d->startAnimRect = QRect();
d->currentAnimRect = QRect();
update();
}
bool NativeTabBar::isVertical() const
{
Shape s = shape();
if(s == RoundedWest ||
s == RoundedEast ||
s == TriangularWest ||
s == TriangularEast) {
return true;
}
return false;
}
bool NativeTabBar::isHorizontal() const
{
return !isVertical();
}
QSize NativeTabBar::tabSize(int index) const
{
QSize hint;
const QFontMetrics metrics(QApplication::font());
const QSize textSize = metrics.size(Qt::TextHideMnemonic, tabText(index));
hint.rwidth() = textSize.width() + iconSize().width();
hint.rheight() = qMax(iconSize().height(), textSize.height());
hint.rwidth() += d->buttonLeft + d->buttonRight;
hint.rheight() += d->buttonTop + d->buttonBottom;
if (isVertical()) {
hint.rwidth() = qMax(hint.width(), int(minimumWidth() - d->left - d->right));
} else {
hint.rheight() = qMax(hint.height(), int(minimumHeight() - d->top - d->bottom));
}
return hint;
}
//Unfortunately copied from KTabBar
QPoint NativeTabBar::closeButtonPos( int tabIndex ) const
{
QPoint buttonPos;
if ( tabIndex < 0 ) {
return buttonPos;
}
int availableHeight = height();
if ( tabIndex == currentIndex() ) {
QStyleOption option;
option.initFrom(this);
availableHeight -= style()->pixelMetric( QStyle::PM_TabBarTabShiftVertical, &option, this );
}
const QRect tabBounds = tabRect( tabIndex );
const int xInc = (height() - KIconLoader::SizeSmall) / 2;
if ( layoutDirection() == Qt::RightToLeft ) {
buttonPos = tabBounds.topLeft();
buttonPos.rx() += xInc;
} else {
buttonPos = tabBounds.topRight();
buttonPos.rx() -= KIconLoader::SizeSmall + xInc;
}
buttonPos.ry() += (availableHeight - KIconLoader::SizeSmall) / 2;
return buttonPos;
}
void NativeTabBar::mousePressEvent(QMouseEvent *event)
{
if (d->currentAnimRect.isNull()) {
QRect rect = tabRect(currentIndex());
if (rect.contains(event->pos())) {
d->mousePressOffset = event->pos().x();
event->accept();
return;
}
}
KTabBar::mousePressEvent(event);
}
void NativeTabBar::mouseMoveEvent(QMouseEvent *event)
{
if (d->mousePressOffset) {
d->currentAnimRect = tabRect(currentIndex());
int pos = qBound(0, d->currentAnimRect.left() + (event->pos().x() - d->mousePressOffset),
width() - d->currentAnimRect.width());
d->currentAnimRect.moveLeft(pos);
update();
} else {
KTabBar::mouseMoveEvent(event);
}
}
void NativeTabBar::mouseReleaseEvent(QMouseEvent *event)
{
if (d->mousePressOffset) {
bool left = event->pos().x() - d->mousePressOffset < 0;
int index = tabAt(QPoint(left ? d->currentAnimRect.left() : d->currentAnimRect.right(), 1));
d->mousePressOffset = 0;
if (index != currentIndex() && isTabEnabled(index)) {
d->startAnimRect = d->currentAnimRect;
setCurrentIndex(index);
} else {
d->currentAnimRect = QRect();
}
update();
} else {
KTabBar::mouseReleaseEvent(event);
}
}
void NativeTabBar::wheelEvent(QWheelEvent *event)
{
if (underMouse()) {
//Cycle tabs with the circular array tecnique
if (event->delta() < 0) {
int index = currentIndex();
//search for an enabled tab
for (int i = 0; i < count()-1; ++i) {
index = (index + 1) % count();
if (isTabEnabled(index)) {
break;
}
}
setCurrentIndex(index);
} else {
int index = currentIndex();
for (int i = 0; i < count()-1; ++i) {
index = (count() + index -1) % count();
if (isTabEnabled(index)) {
break;
}
}
setCurrentIndex(index);
}
} else {
QTabBar::wheelEvent(event);
}
}
} // namespace Plasma
#include "nativetabbar_p.moc"