move statusbar code into the directory "statusbar"

svn path=/trunk/KDE/kdebase/apps/; revision=1005704

1 files changed, 305 insertions, 0 deletions

diff --git a/src/statusbar/statusbarmessagelabel.cpp b/src/statusbar/statusbarmessagelabel.cpp
new file mode 100644
index 000000000..bb7c59d6a
--- /dev/null
+++ b/src/statusbar/statusbarmessagelabel.cpp
@@ -0,0 +1,305 @@
+/***************************************************************************
+ *   Copyright (C) 2006 by Peter Penz                                      *
+ *   [email protected]                                                     *
+ *                                                                         *
+ *   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.                                   *
+ *                                                                         *
+ *   This program 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 General Public License for more details.                          *
+ *                                                                         *
+ *   You should have received a copy of the GNU General Public License     *
+ *   along with this program; if not, write to the                         *
+ *   Free Software Foundation, Inc.,                                       *
+ *   51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA          *
+ ***************************************************************************/
+
+#include "statusbarmessagelabel.h"
+
+#include <kcolorscheme.h>
+#include <kiconloader.h>
+#include <kicon.h>
+#include <klocale.h>
+
+#include <QFontMetrics>
+#include <QPainter>
+#include <QKeyEvent>
+#include <QPushButton>
+#include <QPixmap>
+#include <QTimer>
+
+StatusBarMessageLabel::StatusBarMessageLabel(QWidget* parent) :
+    QWidget(parent),
+    m_type(DolphinStatusBar::Default),
+    m_state(Default),
+    m_illumination(0),
+    m_minTextHeight(-1),
+    m_timer(0),
+    m_closeButton(0)
+{
+    setMinimumHeight(KIconLoader::SizeSmall);
+
+    m_timer = new QTimer(this);
+    connect(m_timer, SIGNAL(timeout()),
+            this, SLOT(timerDone()));
+
+    m_closeButton = new QPushButton(i18nc("@action:button", "Close"), this);
+    m_closeButton->hide();
+    connect(m_closeButton, SIGNAL(clicked()),
+            this, SLOT(closeErrorMessage()));
+}
+
+StatusBarMessageLabel::~StatusBarMessageLabel()
+{
+}
+
+void StatusBarMessageLabel::setMessage(const QString& text,
+                                       DolphinStatusBar::Type type)
+{
+    if ((text == m_text) && (type == m_type)) {
+        return;
+    }
+
+    if (m_type == DolphinStatusBar::Error) {
+        if (type == DolphinStatusBar::Error) {
+            m_pendingMessages.insert(0, m_text);
+        } else if ((m_state != Default) || !m_pendingMessages.isEmpty()) {
+            // a non-error message should not be shown, as there
+            // are other pending error messages in the queue
+            return;
+        }
+    }
+
+    m_text = text;
+    m_type = type;
+
+    m_timer->stop();
+    m_illumination = 0;
+    m_state = Default;
+
+    const char* iconName = 0;
+    QPixmap pixmap;
+    switch (type) {
+    case DolphinStatusBar::OperationCompleted:
+        iconName = "dialog-ok";
+        // "ok" icon should probably be "dialog-success", but we don't have that icon in KDE 4.0
+        m_closeButton->hide();
+        break;
+
+    case DolphinStatusBar::Information:
+        iconName = "dialog-information";
+        m_closeButton->hide();
+        break;
+
+    case DolphinStatusBar::Error:
+        m_timer->start(100);
+        m_state = Illuminate;
+
+        updateCloseButtonPosition();
+        m_closeButton->show();
+        break;
+
+    case DolphinStatusBar::Default:
+    default:
+        m_closeButton->hide();
+        break;
+    }
+
+    m_pixmap = (iconName == 0) ? QPixmap() : SmallIcon(iconName);
+    QTimer::singleShot(GeometryTimeout, this, SLOT(assureVisibleText()));
+    update();
+}
+
+void StatusBarMessageLabel::setMinimumTextHeight(int min)
+{
+    if (min != m_minTextHeight) {
+        m_minTextHeight = min;
+        setMinimumHeight(min);
+        if (m_closeButton->height() > min) {
+            m_closeButton->setFixedHeight(min);
+        }
+    }
+}
+
+int StatusBarMessageLabel::widthGap() const
+{
+    QFontMetrics fontMetrics(font());
+    const int defaultGap = 10;
+    return fontMetrics.width(m_text) - availableTextWidth() + defaultGap;
+}
+
+void StatusBarMessageLabel::paintEvent(QPaintEvent* /* event */)
+{
+    QPainter painter(this);
+
+    if (m_illumination > 0) {
+        // at this point, a: we are a second label being drawn over the already
+        // painted status area, so we can be translucent, and b: our palette's
+        // window color (bg only) seems to be wrong (always black)
+        KColorScheme scheme(palette().currentColorGroup(), KColorScheme::Window);
+        QColor backgroundColor = scheme.background(KColorScheme::NegativeBackground).color();
+        backgroundColor.setAlpha(qMin(255, m_illumination * 2));
+        painter.setBrush(backgroundColor);
+        painter.setPen(Qt::NoPen);
+        painter.drawRect(QRect(0, 0, width(), height()));
+    }
+
+    // draw pixmap
+    int x = BorderGap;
+    const int y = (m_minTextHeight - m_pixmap.height()) / 2;
+
+    if (!m_pixmap.isNull()) {
+        painter.drawPixmap(x, y, m_pixmap);
+        x += m_pixmap.width() + BorderGap;
+    }
+
+    // draw text
+    painter.setPen(palette().windowText().color());
+    int flags = Qt::AlignVCenter;
+    if (height() > m_minTextHeight) {
+        flags = flags | Qt::TextWordWrap;
+    }
+    painter.drawText(QRect(x, 0, availableTextWidth(), height()), flags, m_text);
+    painter.end();
+}
+
+void StatusBarMessageLabel::resizeEvent(QResizeEvent* event)
+{
+    QWidget::resizeEvent(event);
+    updateCloseButtonPosition();
+    QTimer::singleShot(GeometryTimeout, this, SLOT(assureVisibleText()));
+}
+
+void StatusBarMessageLabel::timerDone()
+{
+    switch (m_state) {
+    case Illuminate: {
+        // increase the illumination
+        const int illumination_max = 128;
+        if (m_illumination < illumination_max) {
+            m_illumination += 32;
+            if (m_illumination > illumination_max) {
+                m_illumination = illumination_max;
+            }
+            update();
+        } else {
+            m_state = Illuminated;
+            m_timer->start(5000);
+        }
+        break;
+    }
+
+    case Illuminated: {
+        // start desaturation
+        m_state = Desaturate;
+        m_timer->start(100);
+        break;
+    }
+
+    case Desaturate: {
+        // desaturate
+        if (m_illumination > 0) {
+            m_illumination -= 5;
+            update();
+        } else {
+            m_state = Default;
+            m_timer->stop();
+        }
+        break;
+    }
+
+    default:
+        break;
+    }
+}
+
+void StatusBarMessageLabel::assureVisibleText()
+{
+    if (m_text.isEmpty()) {
+        return;
+    }
+
+    int requiredHeight = m_minTextHeight;
+    if (m_type != DolphinStatusBar::Default) {
+        // Calculate the required height of the widget thats
+        // needed for having a fully visible text. Note that for the default
+        // statusbar type (e. g. hover information) increasing the text height
+        // is not wanted, as this might rearrange the layout of items.
+
+        QFontMetrics fontMetrics(font());
+        const QRect bounds(fontMetrics.boundingRect(0, 0, availableTextWidth(), height(),
+                           Qt::AlignVCenter | Qt::TextWordWrap, m_text));
+        requiredHeight = bounds.height();
+        if (requiredHeight < m_minTextHeight) {
+            requiredHeight = m_minTextHeight;
+        }
+    }
+
+    // Increase/decrease the current height of the widget to the
+    // required height. The increasing/decreasing is done in several
+    // steps to have an animation if the height is modified
+    // (see StatusBarMessageLabel::resizeEvent())
+    const int gap = m_minTextHeight / 2;
+    int minHeight = minimumHeight();
+    if (minHeight < requiredHeight) {
+        minHeight += gap;
+        if (minHeight > requiredHeight) {
+            minHeight = requiredHeight;
+        }
+        setMinimumHeight(minHeight);
+        updateGeometry();
+    } else if (minHeight > requiredHeight) {
+        minHeight -= gap;
+        if (minHeight < requiredHeight) {
+            minHeight = requiredHeight;
+        }
+        setMinimumHeight(minHeight);
+        updateGeometry();
+    }
+
+    updateCloseButtonPosition();
+}
+
+int StatusBarMessageLabel::availableTextWidth() const
+{
+    const int buttonWidth = (m_type == DolphinStatusBar::Error) ?
+                            m_closeButton->width() + BorderGap : 0;
+    return width() - m_pixmap.width() - (BorderGap * 4) - buttonWidth;
+}
+
+void StatusBarMessageLabel::updateCloseButtonPosition()
+{
+    const int x = width() - m_closeButton->width() - BorderGap;
+    const int y = (height() - m_closeButton->height()) / 2;
+    m_closeButton->move(x, y);
+}
+
+void StatusBarMessageLabel::closeErrorMessage()
+{
+    if (!showPendingMessage()) {
+        reset();
+        setMessage(m_defaultText, DolphinStatusBar::Default);
+    }
+}
+
+bool StatusBarMessageLabel::showPendingMessage()
+{
+    if (!m_pendingMessages.isEmpty()) {
+        reset();
+        setMessage(m_pendingMessages.takeFirst(), DolphinStatusBar::Error);
+        return true;
+    }
+    return false;
+}
+
+void StatusBarMessageLabel::reset()
+{
+    m_text.clear();
+    m_type = DolphinStatusBar::Default;
+}
+
+#include "statusbarmessagelabel.moc"