QFilterWidget.cpp

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/*  Copyright (C) 2013 Jens-Malte Gottfried

    This file is part of Tuchulcha.

    Tuchulcha is free software: you can redistribute it and/or modify
    it under the terms of the GNU Lesser General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    Tuchulcha 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 Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public License
    along with Tuchulcha.  If not, see <http://www.gnu.org/licenses/>.
*/
#include "QFilterWidget.h"

#include <QPainter>
#include <QStyle>
#include <QPropertyAnimation>

QT_BEGIN_NAMESPACE

QIconButton::QIconButton(QWidget *pp) : QToolButton(pp) {
    setCursor(Qt::ArrowCursor);
}

void QIconButton::paintEvent(QPaintEvent*) {
    QPainter painter(this);
    // Note isDown should really use the active state but in most styles
    // this has no proper feedback
    QIcon::Mode state = QIcon::Disabled;
    if (isEnabled())
        state = isDown() ? QIcon::Selected : QIcon::Normal;
    QPixmap iconpixmap = icon().pixmap(QSize(ICONBUTTON_SIZE, ICONBUTTON_SIZE),
                                       state, QIcon::Off);
    QRect pixmapRect = QRect(0, 0, iconpixmap.width(), iconpixmap.height());
    pixmapRect.moveCenter(rect().center());
    painter.setOpacity(m_fader);
    painter.drawPixmap(pixmapRect, iconpixmap);
}

void QIconButton::animateShow(bool visible)
{
    if (visible) {
        QPropertyAnimation *animation = new QPropertyAnimation(this, "fader");
        animation->setDuration(160);
        animation->setEndValue(1.0);
        animation->start(QAbstractAnimation::DeleteWhenStopped);
    } else {
        QPropertyAnimation *animation = new QPropertyAnimation(this, "fader");
        animation->setDuration(160);
        animation->setEndValue(0.0);
        animation->start(QAbstractAnimation::DeleteWhenStopped);
    }
}

// ------------------- FilterWidget
QFilterWidget::QFilterWidget(QWidget *pp)  :
    QLineEdit(pp),
    _resetButton(new QIconButton(this))
{
    // Let the style determine minimum height for our widget
    QSize wsize(ICONBUTTON_SIZE + 6, ICONBUTTON_SIZE + 2);

    // Note KDE does not reserve space for the highlight color
    if (style()->inherits("OxygenStyle")) {
        wsize = wsize.expandedTo(QSize(24, 0));
    }

    // Make room for clear icon
    QMargins margins = textMargins();
    if (layoutDirection() == Qt::LeftToRight)
        margins.setRight(wsize.width());
    else
        margins.setLeft(wsize.width());

    setTextMargins(margins);

    // KDE has custom icons for this. Notice that icon namings are counter intuitive
    // If these icons are not avaiable we use the freedesktop standard name before
    // falling back to a bundled resource
    QIcon icon = QIcon::fromTheme(layoutDirection() == Qt::LeftToRight ?
                     QLatin1String("edit-clear-locationbar-rtl") :
                     QLatin1String("edit-clear-locationbar-ltr"),
                     QIcon::fromTheme("edit-clear",
                            QIcon(":/icons/edit-clear-filter.png")));

    _resetButton->setIcon(icon);
    _resetButton->setToolTip(tr("clear text"));
    connect(_resetButton, SIGNAL(clicked()), this, SLOT(clear()));
    connect(this, SIGNAL(textChanged(QString)), this, SLOT(checkButton(QString)));
}

void QFilterWidget::checkButton(const QString &txt)
{
    if (_oldText.isEmpty() || txt.isEmpty())
        _resetButton->animateShow(!text().isEmpty());
    _oldText = txt;
}

void QFilterWidget::resizeEvent(QResizeEvent *)
{
    QRect contentRect = rect();
    if (layoutDirection() == Qt::LeftToRight) {
        const int iconoffset = textMargins().right() + 4;
        _resetButton->setGeometry(contentRect.adjusted(width() - iconoffset, 0, 0, 0));
    } else {
        const int iconoffset = textMargins().left() + 4;
        _resetButton->setGeometry(contentRect.adjusted(0, 0, -width() + iconoffset, 0));
    }
}

QT_END_NAMESPACE