Debugger: Add Image viewer with color picker and context menu.

Change-Id: I31673da5ba85e87c9819059a9e6806b5deecff1e
Reviewed-by: hjk <qthjk@ovi.com>

src/plugins/debugger/imageviewer.cpp

@@ -0,0 +1,170 @@
+/****************************************************************************
+**
+** Copyright (C) 2012 Digia Plc and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/legal
+**
+** This file is part of Qt Creator.
+**
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and Digia.  For licensing terms and
+** conditions see http://qt.digia.com/licensing.  For further information
+** use the contact form at http://qt.digia.com/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Digia gives you certain additional
+** rights.  These rights are described in the Digia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+****************************************************************************/
+
+#include "imageviewer.h"
+#include "debuggerinternalconstants.h"
+
+#include <coreplugin/editormanager/editormanager.h>
+#include <coreplugin/editormanager/ieditor.h>
+
+#include <QLabel>
+#include <QVBoxLayout>
+#include <QImage>
+#include <QPixmap>
+#include <QPoint>
+#include <QMouseEvent>
+#include <QScrollArea>
+#include <QMenu>
+#include <QAction>
+#include <QKeySequence>
+#include <QClipboard>
+#include <QApplication>
+#include <QPainter>
+#include <QDir>
+#include <QTemporaryFile>
+#include <QVariant>
+
+// Widget showing the image in a 1-pixel frame with context menu.
+class ImageWidget : public QWidget
+{
+    Q_OBJECT
+public:
+    explicit ImageWidget(QWidget *parent = 0) : QWidget(parent) {}
+
+    void setImage(const QImage &image);
+    const QImage &image() const { return  m_image; }
+
+signals:
+    void clicked(const QString &message);
+
+protected:
+    void paintEvent(QPaintEvent *);
+    void mousePressEvent(QMouseEvent *ev);
+
+private:
+    QImage m_image;
+};
+
+void ImageWidget::setImage(const QImage &image)
+{
+    setFixedSize(image.size() + QSize(2, 2));
+    m_image = image;
+}
+
+void ImageWidget::mousePressEvent(QMouseEvent *ev)
+{
+    const QPoint imagePos = ev->pos() - QPoint(1, 1);
+    if (m_image.isNull() || imagePos.x() < 0 || imagePos.y() < 0 || imagePos.x() >= m_image.width() || imagePos.y() >= m_image.height()) {
+        emit clicked(QString());
+    } else {
+        const QRgb color = m_image.pixel(imagePos);
+        const QString message =
+            ImageViewer::tr("Color at %1,%2: red: %3 green: %4 blue: %5 alpha: %6").
+            arg(imagePos.x()).arg(imagePos.y()).
+            arg(qRed(color)).arg(qGreen(color)).arg(qBlue(color)).arg(qAlpha(color));
+        emit clicked(message);
+    }
+}
+
+void ImageWidget::paintEvent(QPaintEvent *)
+{
+    if (m_image.isNull())
+        return;
+    QPainter painter(this);
+    QRect rect(QPoint(0, 0), m_image.size() + QSize(1, 1));
+    painter.drawRect(rect);
+    painter.drawImage(QPoint(1, 1), m_image);
+}
+
+ImageViewer::ImageViewer(QWidget *parent)
+    : QWidget(parent)
+    , m_scrollArea(new QScrollArea(this))
+    , m_imageWidget(new ImageWidget)
+    , m_infoLabel(new QLabel)
+{
+    QVBoxLayout *mainLayout = new QVBoxLayout(this);
+    mainLayout->addWidget(m_infoLabel);
+    mainLayout->addWidget(m_scrollArea);
+    m_scrollArea->setWidget(m_imageWidget);
+    connect(m_imageWidget, SIGNAL(clicked(QString)), this, SLOT(clicked(QString)));
+}
+
+void ImageViewer::setImage(const QImage &i)
+{
+    m_imageWidget->setImage(i);
+    m_info = tr("Size: %1x%2, %3 byte, format: %4, depth: %5")
+            .arg(i.width()).arg(i.height()).arg(i.byteCount()).arg(i.format()).arg(i.depth());
+    clicked(QString());
+}
+
+void ImageViewer::clicked(const QString &message)
+{
+    const QString text = m_info + QLatin1Char('\n')
+        + (message.isEmpty() ? tr("<Click to display color>") : message);
+    m_infoLabel->setText(text);
+}
+
+// Open Qt Creator's image viewer
+static void openImageViewer(const QImage &image)
+{
+    QString fileName = QDir::tempPath();
+    if (!fileName.endsWith(QLatin1Char('/')))
+        fileName += QLatin1Char('/');
+    fileName += QLatin1String("qtcreatorXXXXXX.png");
+    {
+        QTemporaryFile temporaryFile(fileName);
+        temporaryFile.setAutoRemove(false);
+        image.save(&temporaryFile);
+        fileName = temporaryFile.fileName();
+        temporaryFile.close();
+    }
+    if (Core::IEditor *e = Core::EditorManager::instance()->openEditor(fileName))
+        e->setProperty(Debugger::Constants::OPENED_BY_DEBUGGER, QVariant(true));
+}
+
+void ImageViewer::contextMenuEvent(QContextMenuEvent *ev)
+{
+    // Offer copy and open in Creator's image viewer.
+    const QImage &image = m_imageWidget->image();
+    const bool hasImage = !image.isNull();
+    QMenu menu;
+    QAction *copyAction = menu.addAction(tr("Copy Image"));
+    copyAction->setShortcut(QKeySequence::Copy);
+    QAction *imageViewerAction = menu.addAction(tr("Open Image Viewer"));
+    copyAction->setEnabled(hasImage);
+    imageViewerAction->setEnabled(hasImage);
+    QAction *action = menu.exec(ev->globalPos());
+    if (action == copyAction) {
+        QApplication::clipboard()->setImage(image);
+    } else if (action == imageViewerAction) {
+        openImageViewer(image);
+    }
+}
+
+#include "imageviewer.moc"