Fix build

src/widgets/imagelabel.cpp

@@ -0,0 +1,87 @@
+// Copyright(c) 2017-2018 Alejandro Sirgo Rica & Contributors
+//
+// This file is part of Flameshot.
+//
+//     Flameshot 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 3 of the License, or
+//     (at your option) any later version.
+//
+//     Flameshot 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 Flameshot.  If not, see <http://www.gnu.org/licenses/>.
+
+// This code is a modified version of the KDE software Spectacle
+// /src/Gui/KSImageWidget.cpp commit cbbd6d45f6426ccbf1a82b15fdf98613ccccbbe9
+
+#include "imagelabel.h"
+
+ImageLabel::ImageLabel(QWidget *parent):
+    QLabel(parent), m_pixmap(QPixmap())
+{
+    m_DSEffect = new QGraphicsDropShadowEffect(this);
+
+    m_DSEffect->setBlurRadius(5);
+    m_DSEffect->setOffset(0);
+    m_DSEffect->setColor(QColor(Qt::black));
+
+    setGraphicsEffect(m_DSEffect);
+    setCursor(Qt::OpenHandCursor);
+    setAlignment(Qt::AlignCenter);
+    setMinimumSize(size());
+}
+
+void ImageLabel::setScreenshot(const QPixmap &pixmap) {
+    m_pixmap = pixmap;
+    const QString tooltip = QStringLiteral("%1x%2 px").arg(m_pixmap.width())
+            .arg(m_pixmap.height());
+    setToolTip(tooltip);
+    setScaledPixmap();
+}
+
+void ImageLabel::setScaledPixmap() {
+    const qreal scale = qApp->devicePixelRatio();
+    QPixmap scaledPixmap = m_pixmap.scaled(size() * scale, Qt::KeepAspectRatio,
+                                           Qt::SmoothTransformation);
+    scaledPixmap.setDevicePixelRatio(scale);
+    setPixmap(scaledPixmap);
+}
+
+// drag handlers
+
+void ImageLabel::mousePressEvent(QMouseEvent *event) {
+    if (event->button() == Qt::LeftButton) {
+        m_dragStartPosition = event->pos();
+        setCursor(Qt::ClosedHandCursor);
+    }
+}
+
+void ImageLabel::mouseReleaseEvent(QMouseEvent *event) {
+    if (event->button() == Qt::LeftButton) {
+        setCursor(Qt::OpenHandCursor);
+    }
+}
+
+void ImageLabel::mouseMoveEvent(QMouseEvent *event)
+{
+    if (!(event->buttons() & Qt::LeftButton)) {
+        return;
+    }
+    if ((event->pos() - m_dragStartPosition).manhattanLength() <
+            QGuiApplication::styleHints()->startDragDistance())
+    {
+        return;
+    }
+    setCursor(Qt::OpenHandCursor);
+    emit dragInitiated();
+}
+
+// resize handler
+void ImageLabel::resizeEvent(QResizeEvent *event) {
+    Q_UNUSED(event);
+    setScaledPixmap();
+}