Implement selection offers from compositor to clients.

It is a hack but works beautifully. It allows the compositor to
participate in copy-paste which becomes mandatory when there is UI
running in the compositor process.

Change-Id: I1993d8705a26159eff0c9947244b66e954b9f460
Sanity-Review: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Jørgen Lind <jorgen.lind@nokia.com>

5 files changed, 102 insertions, 5 deletions

diff --git a/src/compositor/wayland_wrapper/wayland_wrapper.pri b/src/compositor/wayland_wrapper/wayland_wrapper.pri
index 4c1f6ee13..843f3d6d4 100644
--- a/src/compositor/wayland_wrapper/wayland_wrapper.pri
+++ b/src/compositor/wayland_wrapper/wayland_wrapper.pri
@@ -20,7 +20,8 @@ HEADERS += \
     $$PWD/wlextendedsurface.h \
     $$PWD/wlextendedoutput.h \
     $$PWD/wlsubsurface.h \
-    $$PWD/wltouch.h
+    $$PWD/wltouch.h \
+    $$PWD/../../shared/qwaylandmimehelper.h
 
 SOURCES += \
     $$PWD/wlcompositor.cpp \
@@ -37,5 +38,8 @@ SOURCES += \
     $$PWD/wlextendedsurface.cpp \
     $$PWD/wlextendedoutput.cpp \
     $$PWD/wlsubsurface.cpp \
-    $$PWD/wltouch.cpp
+    $$PWD/wltouch.cpp \
+    $$PWD/../../shared/qwaylandmimehelper.cpp
+
+INCLUDEPATH += $$PWD/../../shared
 
diff --git a/src/compositor/wayland_wrapper/wlcompositor.cpp b/src/compositor/wayland_wrapper/wlcompositor.cpp
index 3c453d0a1..23e225255 100644
--- a/src/compositor/wayland_wrapper/wlcompositor.cpp
+++ b/src/compositor/wayland_wrapper/wlcompositor.cpp
@@ -402,8 +402,7 @@ void Compositor::feedRetainedSelectionData(QMimeData *data)
 
 void Compositor::overrideSelection(QMimeData *data)
 {
-    Q_UNUSED(data);
-    // ### TODO implement
+    m_data_device_manager->overrideSelection(*data);
 }
 
 bool Compositor::isDragging() const
diff --git a/src/compositor/wayland_wrapper/wldatadevice.cpp b/src/compositor/wayland_wrapper/wldatadevice.cpp
index f4b2f2b46..bdabf29a4 100644
--- a/src/compositor/wayland_wrapper/wldatadevice.cpp
+++ b/src/compositor/wayland_wrapper/wldatadevice.cpp
@@ -103,7 +103,9 @@ DataDevice::DataDevice(DataDeviceManager *data_device_manager, struct wl_client
 
 void DataDevice::sendSelectionFocus()
 {
-    //do for all clipboards
+    if (m_data_device_manager->offerFromCompositorToClient(m_data_device_resource))
+        return;
+
     DataSource *source = m_data_device_manager->currentSelectionSource();
     if (!source) {
         return;
diff --git a/src/compositor/wayland_wrapper/wldatadevicemanager.cpp b/src/compositor/wayland_wrapper/wldatadevicemanager.cpp
index ba8510bc5..d3e3fb784 100644
--- a/src/compositor/wayland_wrapper/wldatadevicemanager.cpp
+++ b/src/compositor/wayland_wrapper/wldatadevicemanager.cpp
@@ -45,11 +45,14 @@
 #include "wlinputdevice.h"
 #include "wlcompositor.h"
 #include "wldataoffer.h"
+#include "wlsurface.h"
+#include "qwaylandmimehelper.h"
 
 #include <QtCore/QDebug>
 #include <QtCore/QSocketNotifier>
 #include <fcntl.h>
 #include <QtCore/private/qcore_unix_p.h>
+#include <QtCore/QFile>
 
 namespace Wayland {
 
@@ -57,6 +60,7 @@ DataDeviceManager::DataDeviceManager(Compositor *compositor)
     : m_compositor(compositor)
     , m_current_selection_source(0)
     , m_retainedReadNotifier(0)
+    , m_compositorOwnsSelection(false)
 {
     wl_display_add_global(compositor->wl_display(), &wl_data_device_manager_interface, this, DataDeviceManager::bind_func_drag);
 }
@@ -69,6 +73,8 @@ void DataDeviceManager::setCurrentSelectionSource(DataSource *source)
         return;
     }
 
+    m_compositorOwnsSelection = false;
+
     finishReadFromClient();
 
     m_current_selection_source = source;
@@ -210,4 +216,72 @@ struct wl_data_device_manager_interface DataDeviceManager::drag_interface = {
     DataDeviceManager::get_data_device
 };
 
+void DataDeviceManager::overrideSelection(const QMimeData &mimeData)
+{
+    QStringList formats = mimeData.formats();
+    if (formats.isEmpty())
+        return;
+
+    m_retainedData.clear();
+    foreach (const QString &format, formats)
+        m_retainedData.setData(format, mimeData.data(format));
+
+    m_compositor->feedRetainedSelectionData(&m_retainedData);
+
+    m_compositorOwnsSelection = true;
+
+    InputDevice *dev = m_compositor->defaultInputDevice();
+    Surface *focusSurface = dev->keyboardFocus();
+    if (focusSurface)
+        offerFromCompositorToClient(
+                    dev->dataDevice(focusSurface->base()->resource.client)->dataDeviceResource());
+}
+
+bool DataDeviceManager::offerFromCompositorToClient(wl_resource *clientDataDeviceResource)
+{
+    if (!m_compositorOwnsSelection)
+        return false;
+
+    wl_client *client = clientDataDeviceResource->client;
+    qDebug("compositor offers %d types to %p", m_retainedData.formats().count(), client);
+
+    struct wl_resource *selectionOffer =
+             wl_client_new_object(client, &wl_data_offer_interface, &compositor_offer_interface, this);
+    wl_resource_post_event(clientDataDeviceResource, WL_DATA_DEVICE_DATA_OFFER, selectionOffer);
+    foreach (const QString &format, m_retainedData.formats()) {
+        QByteArray ba = format.toLatin1();
+        wl_resource_post_event(selectionOffer, WL_DATA_OFFER_OFFER, ba.constData());
+    }
+    wl_resource_post_event(clientDataDeviceResource, WL_DATA_DEVICE_SELECTION, selectionOffer);
+
+    return true;
+}
+
+void DataDeviceManager::comp_accept(wl_client *, wl_resource *, uint32_t, const char *)
+{
+}
+
+void DataDeviceManager::comp_receive(wl_client *client, wl_resource *resource, const char *mime_type, int32_t fd)
+{
+    DataDeviceManager *self = static_cast<DataDeviceManager *>(resource->data);
+    qDebug("client %p wants data for type %s from compositor", client, mime_type);
+    QByteArray content = QWaylandMimeHelper::getByteArray(&self->m_retainedData, QString::fromLatin1(mime_type));
+    if (!content.isEmpty()) {
+        QFile f;
+        if (f.open(fd, QIODevice::WriteOnly))
+            f.write(content);
+    }
+    close(fd);
+}
+
+void DataDeviceManager::comp_destroy(wl_client *, wl_resource *)
+{
+}
+
+const struct wl_data_offer_interface DataDeviceManager::compositor_offer_interface = {
+    DataDeviceManager::comp_accept,
+    DataDeviceManager::comp_receive,
+    DataDeviceManager::comp_destroy
+};
+
 } //namespace
diff --git a/src/compositor/wayland_wrapper/wldatadevicemanager.h b/src/compositor/wayland_wrapper/wldatadevicemanager.h
index af26cb0e9..75844d207 100644
--- a/src/compositor/wayland_wrapper/wldatadevicemanager.h
+++ b/src/compositor/wayland_wrapper/wldatadevicemanager.h
@@ -71,6 +71,9 @@ public:
 
     void sourceDestroyed(DataSource *source);
 
+    void overrideSelection(const QMimeData &mimeData);
+    bool offerFromCompositorToClient(wl_resource *clientDataDeviceResource);
+
 private slots:
     void readFromClient(int fd);
 
@@ -102,6 +105,21 @@ private:
     int m_retainedReadIndex;
     QByteArray m_retainedReadBuf;
 
+    bool m_compositorOwnsSelection;
+
+
+    static void comp_accept(struct wl_client *client,
+                            struct wl_resource *resource,
+                            uint32_t time,
+                            const char *type);
+    static void comp_receive(struct wl_client *client,
+                             struct wl_resource *resource,
+                             const char *mime_type,
+                             int32_t fd);
+    static void comp_destroy(struct wl_client *client,
+                             struct wl_resource *resource);
+
+    static const struct wl_data_offer_interface compositor_offer_interface;
 };
 
 }