Since Qt 4.5 it is possible to have translucient windows. The tooltip approach having a delegate and custom drawing + animation code for transparent tooltips has now been replaced by a translucient window where any kind of (animated) widget can be embedded. Still a lot of finetuning has to be done, but maybe this code can be part of kdelibs in KDE 4.5 (systemsettings currently used the Dolphin tooltips code).

Additionally the tooltip uses now KMetaDataWidget instead of using KMetaInfo. This assures that no blocking of the application will occur even if there is a buggy Strigi analyzer that ignores the maximum size-setting and might block the retrieving of the meta data.

BUG: 182941
BUG: 195878

svn path=/trunk/KDE/kdebase/apps/; revision=1044485

1 files changed, 93 insertions, 0 deletions

diff --git a/src/tooltips/ktooltipwindow.cpp b/src/tooltips/ktooltipwindow.cpp
new file mode 100644
index 000000000..9a1cb45eb
--- /dev/null
+++ b/src/tooltips/ktooltipwindow.cpp
@@ -0,0 +1,93 @@
+/*******************************************************************************
+ *   Copyright (C) 2008 by Fredrik Höglund <[email protected]>                   *
+ *   Copyright (C) 2008 by Konstantin Heil <[email protected]> *
+ *   Copyright (C) 2009 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 "ktooltipwindow_p.h"
+
+#include <kcolorscheme.h>
+
+#include <QPainter>
+#include <QVBoxLayout>
+
+#ifdef Q_WS_X11
+    #include <QX11Info>
+#endif
+
+KToolTipWindow::KToolTipWindow(QWidget* content) :
+    QWidget(0)
+{
+    setAttribute(Qt::WA_TranslucentBackground);
+    setWindowFlags(Qt::ToolTip | Qt::FramelessWindowHint);
+
+    QVBoxLayout* layout = new QVBoxLayout(this);
+    layout->addWidget(content);
+}
+
+KToolTipWindow::~KToolTipWindow()
+{
+}
+
+void KToolTipWindow::paintEvent(QPaintEvent* event)
+{
+    Q_UNUSED(event);
+
+    QPainter painter(this);
+
+    QColor toColor = palette().brush(QPalette::ToolTipBase).color();
+    QColor fromColor = KColorScheme::shade(toColor, KColorScheme::LightShade, 0.2);
+
+#ifdef Q_WS_X11
+    const bool haveAlphaChannel = QX11Info::isCompositingManagerRunning();
+#else
+    const bool haveAlphaChannel = false;
+#endif
+    if (haveAlphaChannel) {
+        painter.setRenderHint(QPainter::Antialiasing);
+        painter.translate(0.5, 0.5);
+        toColor.setAlpha(220);
+        fromColor.setAlpha(220);
+    }
+
+    QLinearGradient gradient(QPointF(0.0, 0.0), QPointF(width(), height()));
+    gradient.setColorAt(0.0, fromColor);
+    gradient.setColorAt(1.0, toColor);
+    painter.setPen(Qt::NoPen);
+    painter.setBrush(gradient);
+
+    const QRect rect(0, 0, width(), height());
+    const qreal radius = 5;
+
+    QPainterPath path;
+    path.moveTo(rect.left(), rect.top() + radius);
+    arc(path, rect.left()  + radius, rect.top()    + radius, radius, 180, -90);
+    arc(path, rect.right() - radius, rect.top()    + radius, radius,  90, -90);
+    arc(path, rect.right() - radius, rect.bottom() - radius, radius,   0, -90);
+    arc(path, rect.left()  + radius, rect.bottom() - radius, radius, 270, -90);
+    path.closeSubpath();
+
+    painter.drawPath(path);
+}
+
+void KToolTipWindow::arc(QPainterPath& path, qreal cx, qreal cy, qreal radius, qreal angle, qreal sweeplength)
+{
+    path.arcTo(cx-radius, cy-radius, radius * 2, radius * 2, angle, sweeplength);
+}
+
+#include "ktooltipwindow_p.moc"