Fix selection rect after porting from QFontMetrics::width()

[dolphin.git] / src / kitemviews / kitemlistgroupheader.cpp

diff --git a/src/kitemviews/kitemlistgroupheader.cpp b/src/kitemviews/kitemlistgroupheader.cpp
index 5aac02c829d8c39673d755cde35691f0713d008c..0c495693cb6317c632dc29fcb8844b9e72190e6c 100644 (file)
--- a/src/kitemviews/kitemlistgroupheader.cpp
+++ b/src/kitemviews/kitemlistgroupheader.cpp
@@ -1,8 +1,7 @@
 /***************************************************************************
  *   Copyright (C) 2011 by Peter Penz <peter.penz19@gmail.com>             *
  *                                                                         *
- *   Based on the Itemviews NG project from Trolltech Labs:                *
- *   http://qt.gitorious.org/qt-labs/itemviews-ng                          *
+ *   Based on the Itemviews NG project from Trolltech Labs                 *
  *                                                                         *
  *   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  *
@@ -20,18 +19,25 @@
  *   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA            *
  ***************************************************************************/
 
-#include "kitemlistgroupheader.h"
+#include "kstandarditemlistgroupheader.h"
 
 #include "kitemlistview.h"
 
+#include <QGraphicsSceneResizeEvent>
 #include <QPainter>
-
-#include <KDebug>
+#include <QStyleOptionGraphicsItem>
 
 KItemListGroupHeader::KItemListGroupHeader(QGraphicsWidget* parent) :
-    QGraphicsWidget(parent, 0),
+    QGraphicsWidget(parent),
+    m_dirtyCache(true),
     m_role(),
-    m_data()
+    m_data(),
+    m_styleOption(),
+    m_scrollOrientation(Qt::Vertical),
+    m_itemIndex(-1),
+    m_separatorColor(),
+    m_roleColor(),
+    m_roleBounds()
 {
 }
 
@@ -69,34 +75,163 @@ QVariant KItemListGroupHeader::data() const
     return m_data;
 }
 
-QSizeF KItemListGroupHeader::sizeHint(Qt::SizeHint which, const QSizeF& constraint) const
+void KItemListGroupHeader::setStyleOption(const KItemListStyleOption& option)
+{
+    if (m_styleOption == option) {
+        return;
+    }
+
+    const KItemListStyleOption previous = m_styleOption;
+    m_styleOption = option;
+    m_dirtyCache = true;
+    styleOptionChanged(option, previous);
+}
+
+const KItemListStyleOption& KItemListGroupHeader::styleOption() const
+{
+    return m_styleOption;
+}
+
+void KItemListGroupHeader::setScrollOrientation(Qt::Orientation orientation)
+{
+    if (m_scrollOrientation != orientation) {
+        const Qt::Orientation previous = m_scrollOrientation;
+        m_scrollOrientation = orientation;
+        if (orientation == Qt::Vertical) {
+            m_dirtyCache = true;
+        }
+        scrollOrientationChanged(orientation, previous);
+    }
+}
+
+void KItemListGroupHeader::setItemIndex(int index)
+{
+    if (m_itemIndex != index) {
+        const int previous = m_itemIndex;
+        m_itemIndex = index;
+        m_dirtyCache = true;
+        itemIndexChanged(m_itemIndex, previous);
+    }
+}
+
+int KItemListGroupHeader::itemIndex() const
+{
+    return m_itemIndex;
+}
+
+Qt::Orientation KItemListGroupHeader::scrollOrientation() const
 {
-    Q_UNUSED(which);
-    Q_UNUSED(constraint);
-    return QSizeF();
+    return m_scrollOrientation;
 }
 
 void KItemListGroupHeader::paint(QPainter* painter, const QStyleOptionGraphicsItem* option, QWidget* widget)
 {
-    Q_UNUSED(option);
-    Q_UNUSED(widget);
-    painter->setPen(Qt::darkGreen);
-    painter->setBrush(QColor(0, 255, 0, 50));
-    painter->drawRect(rect());
+    Q_UNUSED(painter)
+    Q_UNUSED(option)
+    Q_UNUSED(widget)
+
+    if (m_dirtyCache) {
+        updateCache();
+    }
 
-    //painter->drawText(rect(), QString::number(m_index));
+    paintSeparator(painter, m_separatorColor);
+    paintRole(painter, m_roleBounds, m_roleColor);
 }
 
 void KItemListGroupHeader::roleChanged(const QByteArray& current, const QByteArray& previous)
 {
-    Q_UNUSED(current);
-    Q_UNUSED(previous);
+    Q_UNUSED(current)
+    Q_UNUSED(previous)
 }
 
 void KItemListGroupHeader::dataChanged(const QVariant& current, const QVariant& previous)
 {
-    Q_UNUSED(current);
-    Q_UNUSED(previous);
+    Q_UNUSED(current)
+    Q_UNUSED(previous)
+}
+
+void KItemListGroupHeader::styleOptionChanged(const KItemListStyleOption& current, const KItemListStyleOption& previous)
+{
+    Q_UNUSED(current)
+    Q_UNUSED(previous)
+}
+
+void KItemListGroupHeader::scrollOrientationChanged(Qt::Orientation current, Qt::Orientation previous)
+{
+    Q_UNUSED(current)
+    Q_UNUSED(previous)
+}
+
+void KItemListGroupHeader::itemIndexChanged(int current, int previous)
+{
+    Q_UNUSED(current)
+    Q_UNUSED(previous)
+}
+
+void KItemListGroupHeader::resizeEvent(QGraphicsSceneResizeEvent* event)
+{
+    QGraphicsWidget::resizeEvent(event);
+    if (event->oldSize().height() != event->newSize().height()) {
+        m_dirtyCache = true;
+    }
+}
+
+void KItemListGroupHeader::updateCache()
+{
+    Q_ASSERT(m_dirtyCache);
+
+    // Calculate the role- and line-color. No alphablending is used for
+    // performance reasons.
+    const QColor c1 = textColor();
+    const QColor c2 = baseColor();
+    m_separatorColor = mixedColor(c1, c2, 10);
+    m_roleColor = mixedColor(c1, c2, 60);
+
+    const int padding = qMax(1, m_styleOption.padding);
+    const int horizontalMargin = qMax(2, m_styleOption.horizontalMargin);
+
+    const QFontMetrics fontMetrics(m_styleOption.font);
+    const qreal roleHeight = fontMetrics.height();
+
+    const int y = (m_scrollOrientation == Qt::Vertical) ? padding : horizontalMargin;
+
+    m_roleBounds = QRectF(horizontalMargin + padding,
+                          y,
+                          size().width() - 2 * padding - horizontalMargin,
+                          roleHeight);
+
+    m_dirtyCache = false;
+}
+
+QColor KItemListGroupHeader::mixedColor(const QColor& c1, const QColor& c2, int c1Percent)
+{
+    Q_ASSERT(c1Percent >= 0 && c1Percent <= 100);
+
+    const int c2Percent = 100 - c1Percent;
+    return QColor((c1.red()   * c1Percent + c2.red()   * c2Percent) / 100,
+                  (c1.green() * c1Percent + c2.green() * c2Percent) / 100,
+                  (c1.blue()  * c1Percent + c2.blue()  * c2Percent) / 100);
+}
+
+QPalette::ColorRole KItemListGroupHeader::normalTextColorRole() const
+{
+    return QPalette::Text;
+}
+
+QPalette::ColorRole KItemListGroupHeader::normalBaseColorRole() const
+{
+    return QPalette::Window;
+}
+
+QColor KItemListGroupHeader::textColor() const
+{
+    const QPalette::ColorGroup group = isActiveWindow() ? QPalette::Active : QPalette::Inactive;
+    return styleOption().palette.color(group, normalTextColorRole());
+}
+
+QColor KItemListGroupHeader::baseColor() const
+{
+    const QPalette::ColorGroup group = isActiveWindow() ? QPalette::Active : QPalette::Inactive;
+    return styleOption().palette.color(group, normalBaseColorRole());
 }
 
-#include "kitemlistgroupheader.moc"