Cocoa: Implement Drag-and-Drop.

Implement drag and drop support for drags originating
from outside Qt. Port mime and pasteboard code from
Qt 4. Use QSimpleDrag from from platform support to
implement internal Qt drags.

Change-Id: I5b664a95ebb00f48de2bd21c24dfb579af16123e
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@nokia.com>

1 files changed, 74 insertions, 0 deletions

diff --git a/src/plugins/platforms/cocoa/qnsview.mm b/src/plugins/platforms/cocoa/qnsview.mm
index a43b3fe893..9ed3332ba5 100644
--- a/src/plugins/platforms/cocoa/qnsview.mm
+++ b/src/plugins/platforms/cocoa/qnsview.mm
@@ -46,7 +46,9 @@
 #include "qnsview.h"
 #include "qcocoawindow.h"
 #include "qcocoahelpers.h"
+#include "qcocoaautoreleasepool.h"
 #include "qmultitouch_mac_p.h"
+#include "qcocoadrag.h"
 
 #include <QtGui/QWindowSystemInterface>
 #include <QtCore/QDebug>
@@ -72,6 +74,7 @@ static QTouchDevice *touchDevice = 0;
         m_cgImage = 0;
         m_window = 0;
         m_buttons = Qt::NoButton;
+        currentCustomDragTypes = 0;
         if (!touchDevice) {
             touchDevice = new QTouchDevice;
             touchDevice->setType(QTouchDevice::TouchPad);
@@ -109,6 +112,7 @@ static QTouchDevice *touchDevice = 0;
     m_accessibleRoot = window->accessibleRoot();
 #endif
 
+    [self registerDragTypes];
     [self setPostsFrameChangedNotifications : YES];
     [[NSNotificationCenter defaultCenter] addObserver:self
                                           selector:@selector(updateGeometry)
@@ -471,4 +475,74 @@ static QTouchDevice *touchDevice = 0;
     [self handleKeyEvent : theEvent eventType :int(QEvent::KeyRelease)];
 }
 
+-(void)registerDragTypes
+{
+    QCocoaAutoReleasePool pool;
+    // ### Custom types disabled.
+    QStringList customTypes;  // = qEnabledDraggedTypes();
+    if (currentCustomDragTypes == 0 || *currentCustomDragTypes != customTypes) {
+        if (currentCustomDragTypes == 0)
+            currentCustomDragTypes = new QStringList();
+        *currentCustomDragTypes = customTypes;
+        const NSString* mimeTypeGeneric = @"com.trolltech.qt.MimeTypeName";
+        NSMutableArray *supportedTypes = [NSMutableArray arrayWithObjects:NSColorPboardType,
+                       NSFilenamesPboardType, NSStringPboardType,
+                       NSFilenamesPboardType, NSPostScriptPboardType, NSTIFFPboardType,
+                       NSRTFPboardType, NSTabularTextPboardType, NSFontPboardType,
+                       NSRulerPboardType, NSFileContentsPboardType, NSColorPboardType,
+                       NSRTFDPboardType, NSHTMLPboardType, NSPICTPboardType,
+                       NSURLPboardType, NSPDFPboardType, NSVCardPboardType,
+                       NSFilesPromisePboardType, NSInkTextPboardType,
+                       NSMultipleTextSelectionPboardType, mimeTypeGeneric, nil];
+        // Add custom types supported by the application.
+        for (int i = 0; i < customTypes.size(); i++) {
+           [supportedTypes addObject:QCFString::toNSString(customTypes[i])];
+        }
+        [self registerForDraggedTypes:supportedTypes];
+    }
+}
+
+- (NSDragOperation)draggingEntered:(id <NSDraggingInfo>)sender
+{
+    return [self handleDrag : sender];
+}
+
+- (NSDragOperation)draggingUpdated:(id <NSDraggingInfo>)sender
+{
+    return [self handleDrag : sender];
+}
+
+// Sends drag update to Qt, return the action
+- (NSDragOperation)handleDrag:(id <NSDraggingInfo>)sender
+{
+    NSPoint windowPoint = [self convertPoint: [sender draggingLocation] fromView: nil];
+    QPoint qt_windowPoint(windowPoint.x, windowPoint.y);
+    Qt::DropActions qtAllowed = qt_mac_mapNSDragOperations([sender draggingSourceOperationMask]);
+    QCocoaDropData mimeData([sender draggingPasteboard]);
+
+    QPlatformDragQtResponse response = QWindowSystemInterface::handleDrag(m_window, &mimeData, qt_windowPoint, qtAllowed);
+    return qt_mac_mapDropAction(response.acceptedAction());
+}
+
+- (void)draggingExited:(id <NSDraggingInfo>)sender
+{
+    NSPoint windowPoint = [self convertPoint: [sender draggingLocation] fromView: nil];
+    QPoint qt_windowPoint(windowPoint.x, windowPoint.y);
+
+    // Send 0 mime data to indicate drag exit
+    QWindowSystemInterface::handleDrag(m_window, 0 ,qt_windowPoint, Qt::IgnoreAction);
+}
+
+// called on drop, send the drop to Qt and return if it was accepted.
+- (BOOL)performDragOperation:(id <NSDraggingInfo>)sender
+{
+    NSPoint windowPoint = [self convertPoint: [sender draggingLocation] fromView: nil];
+    QPoint qt_windowPoint(windowPoint.x, windowPoint.y);
+    Qt::DropActions qtAllowed = qt_mac_mapNSDragOperations([sender draggingSourceOperationMask]);
+    QCocoaDropData mimeData([sender draggingPasteboard]);
+
+    QPlatformDropQtResponse response = QWindowSystemInterface::handleDrop(m_window, &mimeData, qt_windowPoint, qtAllowed);
+    return response.isAccepted();
+}
+
 @end