Test drag and drop

The dragwidget shows position of drag move events and
drop events, to help debugging.

Change-Id: Ie7313b74c6c11f527328cab9b851a868c31c4463
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@theqtcompany.com>
Reviewed-by: Morten Johan Sørvig <morten.sorvig@theqtcompany.com>

4 files changed, 300 insertions, 1 deletions

diff --git a/tests/manual/highdpi/dragwidget.cpp b/tests/manual/highdpi/dragwidget.cpp
new file mode 100644
index 0000000000..b203566696
--- /dev/null
+++ b/tests/manual/highdpi/dragwidget.cpp
@@ -0,0 +1,223 @@
+/****************************************************************************
+ **
+ ** Copyright (C) 2015 The Qt Company Ltd.
+ ** Contact: http://www.qt.io/licensing/
+ **
+ ** This file is part of the test suite of the Qt Toolkit.
+ **
+ ** $QT_BEGIN_LICENSE:LGPL21$
+ ** 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 The Qt Company. For licensing terms
+ ** and conditions see http://www.qt.io/terms-conditions. For further
+ ** information use the contact form at http://www.qt.io/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 or version 3 as published by the Free
+ ** Software Foundation and appearing in the file LICENSE.LGPLv21 and
+ ** LICENSE.LGPLv3 included in the packaging of this file. Please review the
+ ** following information to ensure the GNU Lesser General Public License
+ ** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
+ ** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+ **
+ ** As a special exception, The Qt Company gives you certain additional
+ ** rights. These rights are described in The Qt Company LGPL Exception
+ ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+ **
+ ** $QT_END_LICENSE$
+ **
+ ****************************************************************************/
+
+#include <QtWidgets>
+#include "dragwidget.h"
+
+class FramedLabel : public QLabel
+{
+public:
+    FramedLabel(const QString &text, QWidget *parent)
+        : QLabel(text, parent)
+    {
+        setAutoFillBackground(true);
+        setFrameShape(QFrame::Panel);
+        setFrameShadow(QFrame::Raised);
+    }
+};
+
+DragWidget::DragWidget(QString text, QWidget *parent)
+    : QWidget(parent), otherWindow(0)
+{
+    int x = 5;
+    int y = 5;
+
+    bool createChildWindow = text.isEmpty(); // OK, yes this is a hack...
+    if (text.isEmpty())
+        text = "You can drag from this window and drop text here";
+
+    QStringList words = text.split(' ');
+    foreach (QString word, words) {
+        if (!word.isEmpty()) {
+            FramedLabel *wordLabel = new FramedLabel(word, this);
+            wordLabel->move(x, y);
+            wordLabel->show();
+            x += wordLabel->width() + 2;
+            if (x >= 245) {
+                x = 5;
+                y += wordLabel->height() + 2;
+            }
+        }
+    }
+
+    /*
+    QPalette newPalette = palette();
+    newPalette.setColor(QPalette::Window, Qt::white);
+    setPalette(newPalette);
+    */
+
+    setAcceptDrops(true);
+    setMinimumSize(400, qMax(200, y));
+    setWindowTitle(tr("Draggable Text Window %1").arg(createChildWindow ? 1 : 2));
+    if (createChildWindow)
+        otherWindow = new DragWidget("Here is a second window that accepts drops");
+}
+
+void DragWidget::dragEnterEvent(QDragEnterEvent *event)
+{
+    if (event->mimeData()->hasText()) {
+        if (event->source() == this) {
+            event->setDropAction(Qt::MoveAction);
+            event->accept();
+        } else {
+            event->acceptProposedAction();
+        }
+    } else {
+        event->ignore();
+    }
+}
+
+void DragWidget::dragMoveEvent(QDragMoveEvent * event)
+{
+    dragPos = event->pos();
+    dragTimer.start(500, this);
+    update();
+}
+
+void DragWidget::dragLeaveEvent(QDragLeaveEvent *)
+{
+    dragTimer.stop();
+    update();
+}
+
+
+void DragWidget::dropEvent(QDropEvent *event)
+{
+    if (event->mimeData()->hasText()) {
+        const QMimeData *mime = event->mimeData();
+        QStringList pieces = mime->text().split(QRegExp("\\s+"),
+                             QString::SkipEmptyParts);
+        QPoint position = event->pos();
+        QPoint hotSpot;
+
+        QList<QByteArray> hotSpotPos = mime->data("application/x-hotspot").split(' ');
+        if (hotSpotPos.size() == 2) {
+            hotSpot.setX(hotSpotPos.first().toInt());
+            hotSpot.setY(hotSpotPos.last().toInt());
+        }
+        dropPos = position - hotSpot;
+        dropTimer.start(500, this);
+        update();
+
+        foreach (QString piece, pieces) {
+            FramedLabel *newLabel = new FramedLabel(piece, this);
+            newLabel->move(position - hotSpot);
+            newLabel->show();
+
+            position += QPoint(newLabel->width(), 0);
+        }
+
+        if (event->source() == this) {
+            event->setDropAction(Qt::MoveAction);
+            event->accept();
+        } else {
+            event->acceptProposedAction();
+        }
+    } else {
+        event->ignore();
+    }
+    foreach (QObject *child, children()) {
+        if (child->inherits("QWidget")) {
+            QWidget *widget = static_cast<QWidget *>(child);
+            if (!widget->isVisible())
+                widget->deleteLater();
+        }
+    }
+}
+
+void DragWidget::mousePressEvent(QMouseEvent *event)
+{
+    QLabel *child = static_cast<QLabel*>(childAt(event->pos()));
+    if (!child)
+        return;
+
+    QPoint hotSpot = event->pos() - child->pos();
+
+    QMimeData *mimeData = new QMimeData;
+    mimeData->setText(child->text());
+    mimeData->setData("application/x-hotspot",
+                      QByteArray::number(hotSpot.x()) + " " + QByteArray::number(hotSpot.y()));
+
+    QPixmap pixmap(child->size());
+    child->render(&pixmap);
+
+    QDrag *drag = new QDrag(this);
+    drag->setMimeData(mimeData);
+    drag->setPixmap(pixmap);
+    drag->setHotSpot(hotSpot);
+
+    Qt::DropAction dropAction = drag->exec(Qt::CopyAction | Qt::MoveAction, Qt::CopyAction);
+
+    if (dropAction == Qt::MoveAction)
+        child->close();
+}
+
+void DragWidget::timerEvent(QTimerEvent *e)
+{
+    if (e->timerId() == dragTimer.timerId())
+        dragTimer.stop();
+    if (e->timerId() == dropTimer.timerId())
+        dropTimer.stop();
+    update();
+}
+
+void DragWidget::paintEvent(QPaintEvent *)
+{
+    QPainter p(this);
+    p.fillRect(rect(), Qt::white);
+
+    if (dropTimer.isActive()) {
+        p.setBrush(Qt::red);
+        p.drawEllipse(dropPos, 50, 50);
+    }
+
+    if (dragTimer.isActive()) {
+        p.setPen(QPen(Qt::blue, 5));
+        QPoint p1 = (rect().topLeft()*3 + rect().bottomRight())/4;
+        QPoint p2 = (rect().topLeft() + rect().bottomRight()*3)/4;
+        p.drawLine(p1, dragPos);
+        p.drawLine(p2, dragPos);
+    }
+}
+
+void DragWidget::showEvent(QShowEvent *)
+{
+    if (otherWindow)
+        otherWindow->show();
+}
+
+void DragWidget::hideEvent(QHideEvent *)
+{
+    if (otherWindow)
+        otherWindow->hide();
+}
diff --git a/tests/manual/highdpi/dragwidget.h b/tests/manual/highdpi/dragwidget.h
new file mode 100644
index 0000000000..0d9631e2f8
--- /dev/null
+++ b/tests/manual/highdpi/dragwidget.h
@@ -0,0 +1,68 @@
+/****************************************************************************
+ **
+ ** Copyright (C) 2015 The Qt Company Ltd.
+ ** Contact: http://www.qt.io/licensing/
+ **
+ ** This file is part of the test suite of the Qt Toolkit.
+ **
+ ** $QT_BEGIN_LICENSE:LGPL21$
+ ** 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 The Qt Company. For licensing terms
+ ** and conditions see http://www.qt.io/terms-conditions. For further
+ ** information use the contact form at http://www.qt.io/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 or version 3 as published by the Free
+ ** Software Foundation and appearing in the file LICENSE.LGPLv21 and
+ ** LICENSE.LGPLv3 included in the packaging of this file. Please review the
+ ** following information to ensure the GNU Lesser General Public License
+ ** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
+ ** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+ **
+ ** As a special exception, The Qt Company gives you certain additional
+ ** rights. These rights are described in The Qt Company LGPL Exception
+ ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+ **
+ ** $QT_END_LICENSE$
+ **
+ ****************************************************************************/
+
+#ifndef DRAGWIDGET_H
+#define DRAGWIDGET_H
+
+#include <QWidget>
+#include <QBasicTimer>
+
+QT_BEGIN_NAMESPACE
+class QDragEnterEvent;
+class QDropEvent;
+QT_END_NAMESPACE
+
+class DragWidget : public QWidget
+{
+public:
+    DragWidget(QString text = QString(), QWidget *parent = 0);
+
+protected:
+    void dragEnterEvent(QDragEnterEvent *event) Q_DECL_OVERRIDE;
+    void dragLeaveEvent(QDragLeaveEvent *event) Q_DECL_OVERRIDE;
+    void dropEvent(QDropEvent *event) Q_DECL_OVERRIDE;
+    void mousePressEvent(QMouseEvent *event) Q_DECL_OVERRIDE;
+    void dragMoveEvent(QDragMoveEvent * event) Q_DECL_OVERRIDE;
+    void paintEvent(QPaintEvent *) Q_DECL_OVERRIDE;
+    void timerEvent(QTimerEvent *event) Q_DECL_OVERRIDE;
+    void showEvent(QShowEvent *event) Q_DECL_OVERRIDE;
+    void hideEvent(QHideEvent *event) Q_DECL_OVERRIDE;
+private:
+    QPoint dragPos;
+    QPoint dropPos;
+    QBasicTimer dragTimer;
+    QBasicTimer dropTimer;
+    QWidget *otherWindow;
+};
+
+#endif // DRAGWIDGET_H
diff --git a/tests/manual/highdpi/highdpi.pro b/tests/manual/highdpi/highdpi.pro
index 842d98f110..7d6b42535e 100644
--- a/tests/manual/highdpi/highdpi.pro
+++ b/tests/manual/highdpi/highdpi.pro
@@ -6,7 +6,12 @@ CONFIG +=console
 CONFIG -= app_bundle
 CONFIG += c++11
 # Input
-SOURCES += main.cpp
+SOURCES += \
+        dragwidget.cpp \
+        main.cpp
+
+HEADERS += \
+        dragwidget.h
 
 RESOURCES += \
     highdpi.qrc
diff --git a/tests/manual/highdpi/main.cpp b/tests/manual/highdpi/main.cpp
index 0144ef6a80..691338f1e1 100644
--- a/tests/manual/highdpi/main.cpp
+++ b/tests/manual/highdpi/main.cpp
@@ -57,6 +57,8 @@
 #include <QDebug>
 #include <private/qhighdpiscaling_p.h>
 
+#include "dragwidget.h"
+
 class DemoContainerBase
 {
 public:
@@ -701,6 +703,7 @@ int main(int argc, char **argv)
     demoList << new DemoContainer<IconDrawing>("icondrawing", "Test icon drawing");
     demoList << new DemoContainer<Buttons>("buttons", "Test buttons");
     demoList << new DemoContainer<LinePainter>("linepainter", "Test line painting");
+    demoList << new DemoContainer<DragWidget>("draganddrop", "Test drag and drop");
 
 
     foreach (DemoContainerBase *demo, demoList)