From 74c1d61aa3547c80e1c7ee05397c76ccd6260fa7 Mon Sep 17 00:00:00 2001
From: Peter Penz <peter.penz19@gmail.com>
Date: Tue, 3 Nov 2009 21:48:27 +0000
Subject: 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 transparent tooltips has now been replaced by a translucient window where any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
---
 src/tooltips/ktooltipwindow.cpp | 93 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 93 insertions(+)
 create mode 100644 src/tooltips/ktooltipwindow.cpp

(limited to 'src/tooltips/ktooltipwindow.cpp')

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 <fredrik@kde.org>                   *
+ *   Copyright (C) 2008 by Konstantin Heil <konst.heil@stud.uni-heidelberg.de> *
+ *   Copyright (C) 2009 by Peter Penz <peter.penz@gmx.at>                      *
+ *                                                                             *
+ *   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"
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