wasm: move DataTransfer to dom::

Change-Id: I069292154bafd1c08a0d0f2e8a62052f596a80f3
Done-with: [email protected]
Reviewed-by: Lorn Potter <[email protected]>

8 files changed, 194 insertions, 157 deletions

diff --git a/src/corelib/platform/wasm/qstdweb.cpp b/src/corelib/platform/wasm/qstdweb.cpp
index 38ade571bda..2de5fca0402 100644
--- a/src/corelib/platform/wasm/qstdweb.cpp
+++ b/src/corelib/platform/wasm/qstdweb.cpp
@@ -376,112 +376,6 @@ bool jsHaveAsyncify() { return false; }
 bool jsHaveJspi() { return false; }
 
 #endif
-
-struct DataTransferReader
-{
-public:
-    using DoneCallback = std::function<void(std::unique_ptr<QMimeData>)>;
-
-    static std::shared_ptr<CancellationFlag> read(emscripten::val webDataTransfer,
-                                                  std::function<QVariant(QByteArray)> imageReader,
-                                                  DoneCallback onCompleted)
-    {
-        auto cancellationFlag = std::make_shared<CancellationFlag>();
-        (new DataTransferReader(std::move(onCompleted), std::move(imageReader), cancellationFlag))
-                ->read(webDataTransfer);
-        return cancellationFlag;
-    }
-
-    ~DataTransferReader() = default;
-
-private:
-    DataTransferReader(DoneCallback onCompleted, std::function<QVariant(QByteArray)> imageReader,
-                       std::shared_ptr<CancellationFlag> cancellationFlag)
-        : mimeData(std::make_unique<QMimeData>()),
-          imageReader(std::move(imageReader)),
-          onCompleted(std::move(onCompleted)),
-          cancellationFlag(cancellationFlag)
-    {
-    }
-
-    void read(emscripten::val webDataTransfer)
-    {
-        enum class ItemKind {
-            File,
-            String,
-        };
-
-        const auto items = webDataTransfer["items"];
-        for (int i = 0; i < items["length"].as<int>(); ++i) {
-            const auto item = items[i];
-            const auto itemKind =
-                    item["kind"].as<std::string>() == "string" ? ItemKind::String : ItemKind::File;
-            const auto itemMimeType = QString::fromStdString(item["type"].as<std::string>());
-
-            switch (itemKind) {
-            case ItemKind::File: {
-                ++fileCount;
-
-                qstdweb::File file(item.call<emscripten::val>("getAsFile"));
-
-                QByteArray fileContent(file.size(), Qt::Uninitialized);
-                file.stream(fileContent.data(), [this, itemMimeType, fileContent]() {
-                    if (!fileContent.isEmpty()) {
-                        if (itemMimeType.startsWith("image/"_L1)) {
-                            mimeData->setImageData(imageReader(fileContent));
-                        } else {
-                            mimeData->setData(itemMimeType, fileContent.data());
-                        }
-                    }
-                    ++doneCount;
-                    onFileRead();
-                });
-                break;
-            }
-            case ItemKind::String:
-                if (itemMimeType.contains("STRING"_L1, Qt::CaseSensitive)
-                    || itemMimeType.contains("TEXT"_L1, Qt::CaseSensitive)) {
-                    break;
-                }
-                QString a;
-                const QString data = QString::fromEcmaString(webDataTransfer.call<emscripten::val>(
-                        "getData", emscripten::val(itemMimeType.toStdString())));
-
-                if (!data.isEmpty()) {
-                    if (itemMimeType == "text/html"_L1)
-                        mimeData->setHtml(data);
-                    else if (itemMimeType.isEmpty() || itemMimeType == "text/plain"_L1)
-                        mimeData->setText(data); // the type can be empty
-                    else
-                        mimeData->setData(itemMimeType, data.toLocal8Bit());
-                }
-                break;
-            }
-        }
-
-        onFileRead();
-    }
-
-    void onFileRead()
-    {
-        Q_ASSERT(doneCount <= fileCount);
-        if (doneCount < fileCount)
-            return;
-
-        std::unique_ptr<DataTransferReader> deleteThisLater(this);
-        if (!cancellationFlag.expired())
-            onCompleted(std::move(mimeData));
-    }
-
-    int fileCount = 0;
-    int doneCount = 0;
-    std::unique_ptr<QMimeData> mimeData;
-    std::function<QVariant(QByteArray)> imageReader;
-    DoneCallback onCompleted;
-
-    std::weak_ptr<CancellationFlag> cancellationFlag;
-};
-
 } // namespace
 
 ArrayBuffer::ArrayBuffer(uint32_t size)
@@ -948,13 +842,6 @@ bool canBlockCallingThread()
     return haveAsyncify() || !emscripten_is_main_runtime_thread();
 }
 
-std::shared_ptr<CancellationFlag>
-readDataTransfer(emscripten::val webDataTransfer, std::function<QVariant(QByteArray)> imageReader,
-                 std::function<void(std::unique_ptr<QMimeData>)> onDone)
-{
-    return DataTransferReader::read(webDataTransfer, std::move(imageReader), std::move(onDone));
-}
-
 BlobIODevice::BlobIODevice(Blob blob)
     : m_blob(blob)
 {
diff --git a/src/corelib/platform/wasm/qstdweb_p.h b/src/corelib/platform/wasm/qstdweb_p.h
index 110e2c10ac4..707d96704b3 100644
--- a/src/corelib/platform/wasm/qstdweb_p.h
+++ b/src/corelib/platform/wasm/qstdweb_p.h
@@ -290,11 +290,6 @@ namespace qstdweb {
     {
     };
 
-    Q_CORE_EXPORT std::shared_ptr<CancellationFlag>
-    readDataTransfer(emscripten::val webObject, std::function<QVariant(QByteArray)> imageReader,
-                     std::function<void(std::unique_ptr<QMimeData>)> onDone);
-
-
 #if QT_CONFIG(thread)
     template<class T>
     T proxyCall(std::function<T()> task, emscripten::ProxyingQueue *queue)
diff --git a/src/plugins/platforms/wasm/qwasmclipboard.cpp b/src/plugins/platforms/wasm/qwasmclipboard.cpp
index 8916a946d4a..9c7088067eb 100644
--- a/src/plugins/platforms/wasm/qwasmclipboard.cpp
+++ b/src/plugins/platforms/wasm/qwasmclipboard.cpp
@@ -71,24 +71,15 @@ static void qClipboardPasteTo(val event)
     event.call<void>("preventDefault"); // prevent browser from handling drop event
 
     static std::shared_ptr<qstdweb::CancellationFlag> readDataCancellation = nullptr;
-    readDataCancellation = qstdweb::readDataTransfer(
-            event["clipboardData"],
-            [](QByteArray fileContent) {
-                QImage image;
-                image.loadFromData(fileContent, nullptr);
-                return image;
-            },
-            [event](std::unique_ptr<QMimeData> data) {
-                if (data->formats().isEmpty())
-                    return;
-
-                // Persist clipboard data so that the app can read it when handling the CTRL+V
-                QWasmIntegration::get()->clipboard()->QPlatformClipboard::setMimeData(
-                        data.release(), QClipboard::Clipboard);
-
-                QWindowSystemInterface::handleKeyEvent(0, QEvent::KeyPress, Qt::Key_V,
-                                                       Qt::ControlModifier, "V");
-            });
+    dom::DataTransfer transfer(event["clipboardData"]);
+    auto data = transfer.toMimeDataWithFile();
+    if (data->formats().isEmpty())
+        return;
+    // Persist clipboard data so that the app can read it when handling the CTRL+V
+    QWasmIntegration::get()->clipboard()->QPlatformClipboard::setMimeData(data,
+                                                                          QClipboard::Clipboard);
+    QWindowSystemInterface::handleKeyEvent(0, QEvent::KeyPress, Qt::Key_V,
+                                            Qt::ControlModifier, "V");
 }
 
 EMSCRIPTEN_BINDINGS(qtClipboardModule) {
@@ -300,4 +291,5 @@ void QWasmClipboard::writeToClipboard()
     val document = val::global("document");
     document.call<val>("execCommand", val("copy"));
 }
+
 QT_END_NAMESPACE
diff --git a/src/plugins/platforms/wasm/qwasmclipboard.h b/src/plugins/platforms/wasm/qwasmclipboard.h
index 4a21252c8ed..11e7e9f714d 100644
--- a/src/plugins/platforms/wasm/qwasmclipboard.h
+++ b/src/plugins/platforms/wasm/qwasmclipboard.h
@@ -7,6 +7,7 @@
 #include <QObject>
 
 #include <qpa/qplatformclipboard.h>
+#include <private/qstdweb_p.h>
 #include <QMimeData>
 
 #include <emscripten/bind.h>
diff --git a/src/plugins/platforms/wasm/qwasmdom.cpp b/src/plugins/platforms/wasm/qwasmdom.cpp
index ebb2dd4807a..845aef3bc10 100644
--- a/src/plugins/platforms/wasm/qwasmdom.cpp
+++ b/src/plugins/platforms/wasm/qwasmdom.cpp
@@ -8,12 +8,152 @@
 #include <QtCore/qrect.h>
 #include <QtGui/qimage.h>
 #include <private/qstdweb_p.h>
+#include <QtCore/qurl.h>
 
 #include <utility>
+#include <emscripten/wire.h>
 
 QT_BEGIN_NAMESPACE
 
 namespace dom {
+namespace {
+std::string dropActionToDropEffect(Qt::DropAction action)
+{
+    switch (action) {
+    case Qt::DropAction::CopyAction:
+        return "copy";
+    case Qt::DropAction::IgnoreAction:
+        return "none";
+    case Qt::DropAction::LinkAction:
+        return "link";
+    case Qt::DropAction::MoveAction:
+    case Qt::DropAction::TargetMoveAction:
+        return "move";
+    case Qt::DropAction::ActionMask:
+        Q_ASSERT(false);
+        return "";
+    }
+}
+} // namespace
+
+DataTransfer::DataTransfer(emscripten::val webDataTransfer) : webDataTransfer(webDataTransfer) { }
+
+DataTransfer::~DataTransfer() = default;
+
+DataTransfer::DataTransfer(const DataTransfer &other) = default;
+
+DataTransfer::DataTransfer(DataTransfer &&other) = default;
+
+DataTransfer &DataTransfer::operator=(const DataTransfer &other) = default;
+
+DataTransfer &DataTransfer::operator=(DataTransfer &&other) = default;
+
+void DataTransfer::setDragImage(emscripten::val element, const QPoint &hotspot)
+{
+    webDataTransfer.call<void>("setDragImage", element, emscripten::val(hotspot.x()),
+                               emscripten::val(hotspot.y()));
+}
+
+void DataTransfer::setData(std::string format, std::string data)
+{
+    webDataTransfer.call<void>("setData", emscripten::val(std::move(format)),
+                               emscripten::val(std::move(data)));
+}
+
+void DataTransfer::setDropAction(Qt::DropAction action)
+{
+    webDataTransfer.set("dropEffect", emscripten::val(dropActionToDropEffect(action)));
+}
+
+void DataTransfer::setDataFromMimeData(const QMimeData &mimeData)
+{
+    for (const auto &format : mimeData.formats()) {
+        auto data = mimeData.data(format);
+
+        auto encoded = format.startsWith("text/")
+                ? QString::fromLocal8Bit(data).toStdString()
+                : "QB64" + QString::fromLocal8Bit(data.toBase64()).toStdString();
+
+        setData(format.toStdString(), std::move(encoded));
+    }
+}
+
+QMimeData *DataTransfer::toMimeDataWithFile()
+{
+    QMimeData *resultMimeData = new QMimeData(); // QScopedPointer?
+
+    enum class ItemKind {
+        File,
+        String,
+    };
+
+    const auto items = webDataTransfer["items"];
+    QList<QUrl> uriList;
+    for (int i = 0; i < items["length"].as<int>(); ++i) {
+        const auto item = items[i];
+        const auto itemKind =
+                item["kind"].as<std::string>() == "string" ? ItemKind::String : ItemKind::File;
+        const auto itemMimeType = QString::fromStdString(item["type"].as<std::string>());
+
+        switch (itemKind) {
+        case ItemKind::File: {
+            m_webFile = item.call<emscripten::val>("getAsFile");
+            qstdweb::File webfile(m_webFile);
+            QUrl fileUrl(QStringLiteral("file:///") + QString::fromStdString(webfile.name()));
+            uriList.append(fileUrl);
+            break;
+        }
+        case ItemKind::String:
+            if (itemMimeType.contains("STRING", Qt::CaseSensitive)
+                || itemMimeType.contains("TEXT", Qt::CaseSensitive)) {
+                break;
+            }
+            QString a;
+            QString data = QString::fromEcmaString(webDataTransfer.call<emscripten::val>(
+                    "getData", emscripten::val(itemMimeType.toStdString())));
+
+            if (!data.isEmpty()) {
+                if (itemMimeType == "text/html")
+                    resultMimeData->setHtml(data);
+                else if (itemMimeType.isEmpty() || itemMimeType == "text/plain")
+                    resultMimeData->setText(data); // the type can be empty
+                else {
+                    // TODO improve encoding
+                    if (data.startsWith("QB64")) {
+                        data.remove(0, 4);
+                        resultMimeData->setData(itemMimeType,
+                                                  QByteArray::fromBase64(QByteArray::fromStdString(
+                                                          data.toStdString())));
+                    } else {
+                        resultMimeData->setData(itemMimeType, data.toLocal8Bit());
+                    }
+                }
+            }
+            break;
+        }
+    }
+    if (!uriList.isEmpty())
+        resultMimeData->setUrls(uriList);
+    return resultMimeData;
+}
+
+QMimeData *DataTransfer::toMimeDataPreview()
+{
+    auto data = new QMimeData();
+
+    QList<QUrl> uriList;
+    for (int i = 0; i < webDataTransfer["items"]["length"].as<int>(); ++i) {
+        const auto item = webDataTransfer["items"][i];
+        if (item["kind"].as<std::string>() == "file") {
+            uriList.append(QUrl("blob://placeholder"));
+        } else {
+            const auto itemMimeType = QString::fromStdString(item["type"].as<std::string>());
+            data->setData(itemMimeType, QByteArray());
+        }
+    }
+    data->setUrls(uriList);
+    return data;
+}
 
 void syncCSSClassWith(emscripten::val element, std::string cssClassName, bool flag)
 {
diff --git a/src/plugins/platforms/wasm/qwasmdom.h b/src/plugins/platforms/wasm/qwasmdom.h
index 853e54540ec..3ccafba534c 100644
--- a/src/plugins/platforms/wasm/qwasmdom.h
+++ b/src/plugins/platforms/wasm/qwasmdom.h
@@ -6,6 +6,8 @@
 
 #include <QtCore/qtconfigmacros.h>
 #include <QtCore/QPointF>
+#include <private/qstdweb_p.h>
+#include <QtCore/qnamespace.h>
 
 #include <emscripten/val.h>
 
@@ -15,10 +17,36 @@
 
 QT_BEGIN_NAMESPACE
 
+namespace qstdweb {
+    struct CancellationFlag;
+}
+
+class QMimeData;
 class QPoint;
 class QRect;
 
 namespace dom {
+struct DataTransfer
+{
+    explicit DataTransfer(emscripten::val webDataTransfer);
+    ~DataTransfer();
+    DataTransfer(const DataTransfer &other);
+    DataTransfer(DataTransfer &&other);
+    DataTransfer &operator=(const DataTransfer &other);
+    DataTransfer &operator=(DataTransfer &&other);
+
+    QMimeData *toMimeDataWithFile() ;
+    QMimeData *toMimeDataPreview();
+    void setDragImage(emscripten::val element, const QPoint &hotspot);
+    void setData(std::string format, std::string data);
+    void setDropAction(Qt::DropAction dropAction);
+    void setDataFromMimeData(const QMimeData &mimeData);
+
+    emscripten::val webDataTransfer;
+    emscripten::val m_webFile = emscripten::val::undefined();
+    qstdweb::File m_file;
+};
+
 inline emscripten::val document()
 {
     return emscripten::val::global("document");
diff --git a/src/plugins/platforms/wasm/qwasmevent.h b/src/plugins/platforms/wasm/qwasmevent.h
index 8ccbbb71045..c5c20a0b5e9 100644
--- a/src/plugins/platforms/wasm/qwasmevent.h
+++ b/src/plugins/platforms/wasm/qwasmevent.h
@@ -5,6 +5,7 @@
 #define QWASMEVENT_H
 
 #include "qwasmplatform.h"
+#include "qwasmdom.h"
 
 #include <QtCore/qglobal.h>
 #include <QtCore/qnamespace.h>
@@ -241,7 +242,7 @@ struct DragEvent : public MouseEvent
     void acceptDrop();
 
     Qt::DropAction dropAction;
-    emscripten::val dataTransfer;
+    dom::DataTransfer dataTransfer;
     QWindow *targetWindow;
 };
 
diff --git a/src/plugins/platforms/wasm/qwasmwindow.cpp b/src/plugins/platforms/wasm/qwasmwindow.cpp
index bf2fdf47736..fa7eed14640 100644
--- a/src/plugins/platforms/wasm/qwasmwindow.cpp
+++ b/src/plugins/platforms/wasm/qwasmwindow.cpp
@@ -114,7 +114,6 @@ QWasmWindow::QWasmWindow(QWindow *w, QWasmDeadKeySupport *deadKeySupport,
             std::make_unique<qstdweb::EventCallback>(m_qtWindow, "pointerenter", pointerCallback);
     m_pointerLeaveCallback =
             std::make_unique<qstdweb::EventCallback>(m_qtWindow, "pointerleave", pointerCallback);
-
     m_dropCallback = std::make_unique<qstdweb::EventCallback>(
             m_qtWindow, "drop", [this](emscripten::val event) {
                 if (processDrop(*DragEvent::fromWeb(event, window())))
@@ -538,25 +537,19 @@ bool QWasmWindow::processPointer(const PointerEvent &event)
 
 bool QWasmWindow::processDrop(const DragEvent &event)
 {
-    m_dropDataReadCancellationFlag = qstdweb::readDataTransfer(
-            event.dataTransfer,
-            [](QByteArray fileContent) {
-                QImage image;
-                image.loadFromData(fileContent, nullptr);
-                return image;
-            },
-            [this, event](std::unique_ptr<QMimeData> data) {
-                QWindowSystemInterface::handleDrag(window(), data.get(),
-                                                   event.pointInPage.toPoint(), event.dropAction,
-                                                   event.mouseButton, event.modifiers);
-
-                QWindowSystemInterface::handleDrop(window(), data.get(),
-                                                   event.pointInPage.toPoint(), event.dropAction,
-                                                   event.mouseButton, event.modifiers);
-
-                QWindowSystemInterface::handleDrag(window(), nullptr, QPoint(), Qt::IgnoreAction,
-                                                   {}, {});
-            });
+    dom::DataTransfer transfer(event.dataTransfer.webDataTransfer["clipboardData"]);
+    QMimeData *data = transfer.toMimeDataWithFile();
+    // TODO handle file
+    QWindowSystemInterface::handleDrag(window(), data,
+                                       event.pointInPage.toPoint(), event.dropAction,
+                                       event.mouseButton, event.modifiers);
+
+    QWindowSystemInterface::handleDrop(window(), data,
+                                       event.pointInPage.toPoint(), event.dropAction,
+                                       event.mouseButton, event.modifiers);
+
+    QWindowSystemInterface::handleDrag(window(), nullptr, QPoint(), Qt::IgnoreAction,
+                                       {}, {});
     return true;
 }