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Plasma

textbrowser.cpp

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00001 /*
00002  *   Copyright 2009 Marco Martin <notmart@gmail.com>
00003  *
00004  *   This program is free software; you can redistribute it and/or modify
00005  *   it under the terms of the GNU Library General Public License as
00006  *   published by the Free Software Foundation; either version 2, or
00007  *   (at your option) any later version.
00008  *
00009  *   This program is distributed in the hope that it will be useful,
00010  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
00011  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00012  *   GNU General Public License for more details
00013  *
00014  *   You should have received a copy of the GNU Library General Public
00015  *   License along with this program; if not, write to the
00016  *   Free Software Foundation, Inc.,
00017  *   51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
00018  */
00019 
00020 #include "textbrowser.h"
00021 
00022 #include <QPainter>
00023 #include <QScrollBar>
00024 #include <QGraphicsSceneWheelEvent>
00025 
00026 #include <kmimetype.h>
00027 #include <ktextbrowser.h>
00028 
00029 #include "plasma/theme.h"
00030 #include "plasma/svg.h"
00031 #include "private/style_p.h"
00032 
00033 namespace Plasma
00034 {
00035 
00036 class TextBrowserPrivate
00037 {
00038 public:
00039     TextBrowserPrivate(TextBrowser *browser)
00040         : q(browser),
00041           native(0),
00042           savedMinimumHeight(0),
00043           savedMaximumHeight(QWIDGETSIZE_MAX),
00044           wasNotFixed(true)
00045     {
00046     }
00047 
00048     void setFixedHeight()
00049     {
00050         if (native && native->document() &&
00051             q->sizePolicy().verticalPolicy() == QSizePolicy::Fixed &&
00052             native->verticalScrollBarPolicy() == Qt::ScrollBarAlwaysOff) {
00053             native->document()->setTextWidth(q->size().width());
00054             QSize s = native->document()->size().toSize();
00055             if (wasNotFixed) {
00056                 savedMinimumHeight = q->minimumHeight();
00057                 savedMaximumHeight = q->maximumHeight();
00058                 wasNotFixed = false;
00059             }
00060             q->setMinimumHeight(s.height());
00061             q->setMaximumHeight(s.height());
00062         } else if (!wasNotFixed) {
00063             q->setMinimumHeight(savedMinimumHeight);
00064             q->setMaximumHeight(savedMaximumHeight);
00065             wasNotFixed = true;
00066         }
00067     }
00068 
00069 
00070     TextBrowser *q;
00071     KTextBrowser *native;
00072     Plasma::Style::Ptr style;
00073     int savedMinimumHeight;
00074     int savedMaximumHeight;
00075     bool wasNotFixed;
00076 };
00077 
00078 TextBrowser::TextBrowser(QGraphicsWidget *parent)
00079     : QGraphicsProxyWidget(parent),
00080       d(new TextBrowserPrivate(this))
00081 {
00082     KTextBrowser *native = new KTextBrowser;
00083     connect(native, SIGNAL(textChanged()), this, SIGNAL(textChanged()));
00084     connect(native, SIGNAL(textChanged()), this, SLOT(setFixedHeight()));
00085     setWidget(native);
00086     d->native = native;
00087     native->setAttribute(Qt::WA_NoSystemBackground);
00088     native->setFrameShape(QFrame::NoFrame);
00089     native->setTextBackgroundColor(Qt::transparent);
00090     native->viewport()->setAutoFillBackground(false);
00091     d->style = Plasma::Style::sharedStyle();
00092     native->verticalScrollBar()->setStyle(d->style.data());
00093     native->horizontalScrollBar()->setStyle(d->style.data());
00094 }
00095 
00096 TextBrowser::~TextBrowser()
00097 {
00098     delete d;
00099     Plasma::Style::doneWithSharedStyle();
00100 }
00101 
00102 void TextBrowser::setText(const QString &text)
00103 {
00104     //FIXME I'm not certain about using only the html methods. look at this again later.
00105     static_cast<KTextBrowser*>(widget())->setHtml(text);
00106 }
00107 
00108 QString TextBrowser::text() const
00109 {
00110     return static_cast<KTextBrowser*>(widget())->toHtml();
00111 }
00112 
00113 void TextBrowser::setHorizontalScrollBarPolicy(Qt::ScrollBarPolicy policy)
00114 {
00115     d->native->setHorizontalScrollBarPolicy(policy);
00116 }
00117 
00118 void TextBrowser::setVerticalScrollBarPolicy(Qt::ScrollBarPolicy policy)
00119 {
00120     d->native->setVerticalScrollBarPolicy(policy);
00121 }
00122 
00123 void TextBrowser::setStyleSheet(const QString &stylesheet)
00124 {
00125     widget()->setStyleSheet(stylesheet);
00126 }
00127 
00128 QString TextBrowser::styleSheet()
00129 {
00130     return widget()->styleSheet();
00131 }
00132 
00133 KTextBrowser *TextBrowser::nativeWidget() const
00134 {
00135     return static_cast<KTextBrowser*>(widget());
00136 }
00137 
00138 void TextBrowser::dataUpdated(const QString &sourceName, const Plasma::DataEngine::Data &data)
00139 {
00140     Q_UNUSED(sourceName)
00141 
00142     KTextBrowser *te = nativeWidget();
00143     te->clear();
00144 
00145     foreach (const QVariant &v, data) {
00146         if (v.canConvert(QVariant::String)) {
00147             te->append(v.toString() + '\n');
00148         }
00149     }
00150 }
00151 
00152 void TextBrowser::resizeEvent(QGraphicsSceneResizeEvent *event)
00153 {
00154     d->setFixedHeight();
00155     QGraphicsProxyWidget::resizeEvent(event);
00156 }
00157 
00158 void TextBrowser::wheelEvent(QGraphicsSceneWheelEvent *event)
00159 {
00160     if (d->native->verticalScrollBarPolicy() == Qt::ScrollBarAlwaysOff &&
00161         d->native->horizontalScrollBarPolicy() == Qt::ScrollBarAlwaysOff) {
00162         event->ignore();
00163     } else {
00164         QGraphicsProxyWidget::wheelEvent(event);
00165     }
00166 }
00167 
00168 } // namespace Plasma
00169 
00170 #include <textbrowser.moc>
00171 

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