Drag and Drop of files on the application

It is now possible to drag and drop files directly on the application.
The files will then be successively opened by the application. The last
one to be opened will be in the active window.

Sources/documentwindow.cpp

@@ -0,0 +1,106 @@
+// -------------------------------------------------------------------------------------------------
+/**
+ *  @file
+ *  @brief
+ *  @author Gerolf Reinwardt
+ *  @date   30.01.2011
+ *
+ *  Copyright (c) 2011, Gerolf Reinwardt. All rights reserved.
+ *
+ *  Simplified BSD License
+ *
+ *  Redistribution and use in source and binary forms, with or without modification, are
+ *  permitted provided that the following conditions are met:
+ *
+ *  1. Redistributions of source code must retain the above copyright notice, this list of
+ *     conditions and the following disclaimer.
+ *
+ *  2. Redistributions in binary form must reproduce the above copyright notice, this list
+ *     of conditions and the following disclaimer in the documentation and/or other materials
+ *     provided with the distribution.
+ *
+ *  THIS SOFTWARE IS PROVIDED BY <COPYRIGHT HOLDER> ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ *  FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> OR
+ *  CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ *  SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ *  ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ *  ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ *  The views and conclusions contained in the software and documentation are those of the
+ *  authors and should not be interpreted as representing official policies, either expressed
+ *  or implied, of Gerolf Reinwardt.
+ */
+// -------------------------------------------------------------------------------------------------
+
+// ----- general includes --------------------------------------------------------------------------
+#include <QDragEnterEvent>
+#include <QDragLeaveEvent>
+#include <QDragMoveEvent>
+#include <QDropEvent>
+#include <QMimeData>
+#include <QUrl>
+#include <QList>
+
+// ----- local includes ----------------------------------------------------------------------------
+#include "documentwindow.h"
+
+
+// ----- construction ------------------------------------------------------------------------------
+DocumentWindow::DocumentWindow(QWidget* parent, Qt::WindowFlags flags) :
+    QMainWindow(parent, flags)
+{
+    setAcceptDrops(true);
+}
+
+DocumentWindow::~DocumentWindow()
+{
+}
+
+// ----- operators ---------------------------------------------------------------------------------
+// ----- methods -----------------------------------------------------------------------------------
+// ----- accessors ---------------------------------------------------------------------------------
+// ----- public slots ------------------------------------------------------------------------------
+// ----- protected slots ---------------------------------------------------------------------------
+// ----- events ------------------------------------------------------------------------------------
+void DocumentWindow::dragEnterEvent(QDragEnterEvent* event)
+{
+    // if some actions should not be usable, like move, this code must be adopted
+    event->acceptProposedAction();
+}
+
+void DocumentWindow::dragMoveEvent(QDragMoveEvent* event)
+{
+    // if some actions should not be usable, like move, this code must be adopted
+    event->acceptProposedAction();
+}
+
+
+void DocumentWindow::dragLeaveEvent(QDragLeaveEvent* event)
+{
+    event->accept();
+}
+
+void DocumentWindow::dropEvent(QDropEvent* event)
+{
+    const QMimeData* mimeData = event->mimeData();
+
+    if (mimeData->hasUrls())
+    {
+        QStringList pathList;
+        QList<QUrl> urlList = mimeData->urls();
+
+        for (int i = 0; i < urlList.size() && i < 32; ++i)
+        {
+            pathList.append(urlList.at(i).toLocalFile());
+        }
+
+        if(openFiles(pathList))
+            event->acceptProposedAction();
+    }
+}
+
+// ----- private slots -----------------------------------------------------------------------------
+// ----- private helpers ---------------------------------------------------------------------------

Sources/documentwindow.h

@@ -0,0 +1,173 @@
+// -------------------------------------------------------------------------------------------------
+/**
+ *  @file
+ *  @brief
+ *  @author Gerolf Reinwardt
+ *  @date   30. march 2011
+ *
+ *  Copyright (c) 2011, Gerolf Reinwardt. All rights reserved.
+ *
+ *  Simplified BSD License
+ *
+ *  Redistribution and use in source and binary forms, with or without modification, are
+ *  permitted provided that the following conditions are met:
+ *
+ *  1. Redistributions of source code must retain the above copyright notice, this list of
+ *     conditions and the following disclaimer.
+ *
+ *  2. Redistributions in binary form must reproduce the above copyright notice, this list
+ *     of conditions and the following disclaimer in the documentation and/or other materials
+ *     provided with the distribution.
+ *
+ *  THIS SOFTWARE IS PROVIDED BY <COPYRIGHT HOLDER> ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ *  FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> OR
+ *  CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ *  SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ *  ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ *  ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ *  The views and conclusions contained in the software and documentation are those of the
+ *  authors and should not be interpreted as representing official policies, either expressed
+ *  or implied, of Gerolf Reinwardt.
+ */
+// -------------------------------------------------------------------------------------------------
+
+#ifndef WIDGET_H
+#define WIDGET_H
+
+// ----- general includes --------------------------------------------------------------------------
+#include <QMainWindow>
+#include <QStringList>
+
+// ----- local includes ----------------------------------------------------------------------------
+// ----- pre defines -------------------------------------------------------------------------------
+
+// ----- class definition --------------------------------------------------------------------------
+/**
+ *  @short
+ *
+ *  The usage is fairly easy. Derive your own MainWindow class from DocumentWindow instead of QMainWindow
+ *  and implement the pure virtual function openFiles.
+ *
+ *  @code
+    MainWindow::MainWindow(QWidget* parent, Qt::WindowFlags flags) :
+        DocumentWindow(parent, flags)
+    {
+        ...
+ 
+        setWindowTitle(tr("MDI"));
+        setUnifiedTitleAndToolBarOnMac(true);
+    }
+    @endcode
+ *
+ *  Aditionally, the openFiles must be implermented:
+ *
+ *  @code
+        bool MyClass::openFiles(const QStringList& pathList)
+        {
+            bool success = true;
+            for (int i = 0; i < pathList.size() && i < 32; ++i)
+            {
+                MdiChild *child = createMdiChild();
+                if (child->loadFile(pathList.at(i)))
+                {
+                    statusBar()->showMessage(tr("File loaded"), 2000);
+                    child->show();
+                }
+                else
+                {
+                    child->close();
+                }
+            }
+            return success;
+        }
+    @endcode
+ *
+ */
+class DocumentWindow : public QMainWindow
+{
+    Q_OBJECT
+public:
+    // ----- enums ---------------------------------------------------------------------------------
+    // ----- construction --------------------------------------------------------------------------
+    /**
+     *  Constructor.
+     *
+     *  Creates a DocumentWindow with a given @arg parent and @arg flags.
+     */
+    explicit DocumentWindow(QWidget* parent = 0, Qt::WindowFlags flags = 0);
+
+    /**
+     *  Destructor
+     */
+    ~DocumentWindow();
+
+    // ----- operators -----------------------------------------------------------------------------
+    // ----- methods -------------------------------------------------------------------------------
+    // ----- accessors -----------------------------------------------------------------------------
+    // ----- members -------------------------------------------------------------------------------
+
+protected:
+    // ----- events --------------------------------------------------------------------------------
+    /**
+     *  this event is called when the mouse enters the widgets area during a drag/drop operation
+     */
+    void dragEnterEvent(QDragEnterEvent* event);
+
+    /**
+     *  this event is called when the mouse moves inside the widgets area during a drag/drop operation
+     */
+    void dragMoveEvent(QDragMoveEvent* event);
+
+    /**
+     *  this event is called when the mouse leaves the widgets area during a drag/drop operation
+     */
+    void dragLeaveEvent(QDragLeaveEvent* event);
+
+    /**
+     *  this event is called when the drop operation is initiated at the widget
+     */
+    void dropEvent(QDropEvent* event);
+
+    // ----- helpers -------------------------------------------------------------------------------
+    /**
+     *  This method must be implemented by the client. It is used to opened the dropped files.
+     *
+     *  @param pathList list of urls given by the drop event
+     *  @retval true if successfull otherwise false
+     *
+     *  Here is an example implementation:
+     *
+     *  @code
+        bool MyClass::openFiles(const QStringList& pathList)
+        {
+            bool success = true;
+            for (int i = 0; i < pathList.size() && i < 32; ++i)
+            {
+                MdiChild *child = createMdiChild();
+                if (child->loadFile(pathList.at(i)))
+                {
+                    statusBar()->showMessage(tr("File loaded"), 2000);
+                    child->show();
+                }
+                else
+                {
+                    child->close();
+                }
+            }
+            return success;
+        }
+        @endcode
+     */
+    virtual bool openFiles(const QStringList& pathList) = 0;
+
+private:
+    // ----- privat helpers ------------------------------------------------------------------------
+    // ----- members -------------------------------------------------------------------------------
+    // ----- not allowed members -------------------------------------------------------------------
+};
+
+#endif // WIDGET_H

Sources/stlviewer.cpp

@@ -29,6 +29,7 @@
 #include <QDockWidget>
 #include <QVBoxLayout>
 #include <QSettings>
+#include <QMdiArea>
 
 #include <iostream>
 #include <fstream>
@@ -41,7 +42,7 @@
 #include "settingsdialog.h"
 
 STLViewer::STLViewer(QWidget *parent, Qt::WFlags flags)
-    :   QMainWindow(parent, flags)
+    :   DocumentWindow(parent, flags)
 {
     mdiArea = new QMdiArea;
     mdiArea->setHorizontalScrollBarPolicy(Qt::ScrollBarAsNeeded);
@@ -69,6 +70,40 @@ STLViewer::STLViewer(QWidget *parent, Qt::WFlags flags)
 
 STLViewer::~STLViewer() {}
 
+void STLViewer::openFile(const QString& path)
+{
+    QMdiSubWindow *existing = findGLMdiChild(path);
+    if(existing)
+    {
+        mdiArea->setActiveSubWindow(existing);
+    }
+    else
+    {
+        GLMdiChild *child = createGLMdiChild();
+        if(child->loadFile(path))
+        {
+            statusBar()->showMessage(tr("File loaded"), 2000);
+            child->show();
+        }
+        else
+        {
+            setActiveSubWindow(child);
+            mdiArea->closeActiveSubWindow();
+            //child->close();
+        }
+    }
+}
+
+bool STLViewer::openFiles(const QStringList& pathList)
+{
+    bool success = true;
+    for (int i = 0; i < pathList.size() && i < 32; ++i)
+    {
+        openFile(pathList.at(i));
+    }
+    return success;
+}
+
 void STLViewer::closeEvent(QCloseEvent *event)
 {
     mdiArea->closeAllSubWindows();
@@ -102,24 +137,7 @@ void STLViewer::open()
     if(!fileName.isEmpty())
     {
         curDir = QFileInfo(fileName).filePath();
-        QMdiSubWindow *existing = findGLMdiChild(fileName);
-        if(existing)
-        {
-            mdiArea->setActiveSubWindow(existing);
-            return;
-        }
-        GLMdiChild *child = createGLMdiChild();
-        if(child->loadFile(fileName))
-        {
-            statusBar()->showMessage(tr("File loaded"), 2000);
-            child->show();
-        }
-        else
-        {
-            setActiveSubWindow(child);
-            mdiArea->closeActiveSubWindow();
-            //child->close();
-        }
+        openFile(fileName);
     }
 }
 
@@ -445,7 +463,7 @@ void STLViewer::createActions()
     connect(showSettingsDialogAct, SIGNAL(triggered()), this, SLOT(showSettingsDialog()));
 
     closeAct = new QAction(tr("Cl&ose"), this);
-    closeAct->setShortcut(tr("Ctrl+W"));
+    //closeAct->setShortcut(tr("Ctrl+W"));
     closeAct->setStatusTip(tr("Close the active window"));
     connect(closeAct, SIGNAL(triggered()), mdiArea, SLOT(closeActiveSubWindow()));