diff options
Diffstat (limited to 'src/plugins/platforms/wasm/qwasmdrag.cpp')
| -rw-r--r-- | src/plugins/platforms/wasm/qwasmdrag.cpp | 291 |
1 files changed, 291 insertions, 0 deletions
diff --git a/src/plugins/platforms/wasm/qwasmdrag.cpp b/src/plugins/platforms/wasm/qwasmdrag.cpp new file mode 100644 index 0000000000..d07a46618f --- /dev/null +++ b/src/plugins/platforms/wasm/qwasmdrag.cpp @@ -0,0 +1,291 @@ +// Copyright (C) 2023 The Qt Company Ltd. +// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only + +#include "qwasmdrag.h" + +#include "qwasmbase64iconstore.h" +#include "qwasmdom.h" +#include "qwasmevent.h" +#include "qwasmintegration.h" + +#include <qpa/qwindowsysteminterface.h> + +#include <QtCore/private/qstdweb_p.h> +#include <QtCore/qeventloop.h> +#include <QtCore/qmimedata.h> +#include <QtCore/qtimer.h> +#include <QFile> + +#include <functional> +#include <string> +#include <utility> + +QT_BEGIN_NAMESPACE + +namespace { + +QWindow *windowForDrag(QDrag *drag) +{ + QWindow *window = qobject_cast<QWindow *>(drag->source()); + if (window) + return window; + if (drag->source()->metaObject()->indexOfMethod("_q_closestWindowHandle()") == -1) + return nullptr; + + QMetaObject::invokeMethod(drag->source(), "_q_closestWindowHandle", + Q_RETURN_ARG(QWindow *, window)); + return window; +} + +} // namespace + +struct QWasmDrag::DragState +{ + class DragImage + { + public: + DragImage(const QPixmap &pixmap, const QMimeData *mimeData, QWindow *window); + ~DragImage(); + + emscripten::val htmlElement(); + + private: + emscripten::val generateDragImage(const QPixmap &pixmap, const QMimeData *mimeData); + emscripten::val generateDragImageFromText(const QMimeData *mimeData); + emscripten::val generateDefaultDragImage(); + emscripten::val generateDragImageFromPixmap(const QPixmap &pixmap); + + emscripten::val m_imageDomElement; + emscripten::val m_temporaryImageElementParent; + }; + + DragState(QDrag *drag, QWindow *window, std::function<void()> quitEventLoopClosure); + ~DragState(); + DragState(const QWasmDrag &other) = delete; + DragState(QWasmDrag &&other) = delete; + DragState &operator=(const QWasmDrag &other) = delete; + DragState &operator=(QWasmDrag &&other) = delete; + + QDrag *drag; + QWindow *window; + std::function<void()> quitEventLoopClosure; + std::unique_ptr<DragImage> dragImage; + Qt::DropAction dropAction = Qt::DropAction::IgnoreAction; +}; + +QWasmDrag::QWasmDrag() = default; + +QWasmDrag::~QWasmDrag() = default; + +QWasmDrag *QWasmDrag::instance() +{ + return static_cast<QWasmDrag *>(QWasmIntegration::get()->drag()); +} + +Qt::DropAction QWasmDrag::drag(QDrag *drag) +{ + Q_ASSERT_X(!m_dragState, Q_FUNC_INFO, "Drag already in progress"); + + QWindow *window = windowForDrag(drag); + if (!window) + return Qt::IgnoreAction; + + Qt::DropAction dragResult = Qt::IgnoreAction; + if (qstdweb::haveJspi()) { + QEventLoop loop; + m_dragState = std::make_unique<DragState>(drag, window, [&loop]() { loop.quit(); }); + loop.exec(); + dragResult = m_dragState->dropAction; + m_dragState.reset(); + } + + if (dragResult == Qt::IgnoreAction) + dragResult = QBasicDrag::drag(drag); + + return dragResult; +} + +void QWasmDrag::onNativeDragStarted(DragEvent *event) +{ + Q_ASSERT_X(event->type == EventType::DragStart, Q_FUNC_INFO, + "The event is not a DragStart event"); + // It is possible for a drag start event to arrive from another window. + if (!m_dragState || m_dragState->window != event->targetWindow) { + event->cancelDragStart(); + return; + } + + m_dragState->dragImage = std::make_unique<DragState::DragImage>( + m_dragState->drag->pixmap(), m_dragState->drag->mimeData(), event->targetWindow); + event->dataTransfer.setDragImage(m_dragState->dragImage->htmlElement(), + m_dragState->drag->hotSpot()); + event->dataTransfer.setDataFromMimeData(*m_dragState->drag->mimeData()); +} + +void QWasmDrag::onNativeDragOver(DragEvent *event) +{ + auto mimeDataPreview = event->dataTransfer.toMimeDataPreview(); + + const Qt::DropActions actions = m_dragState + ? m_dragState->drag->supportedActions() + : (Qt::DropAction::CopyAction | Qt::DropAction::MoveAction + | Qt::DropAction::LinkAction); + + const auto dragResponse = QWindowSystemInterface::handleDrag( + event->targetWindow, &*mimeDataPreview, event->pointInPage.toPoint(), actions, + event->mouseButton, event->modifiers); + event->acceptDragOver(); + if (dragResponse.isAccepted()) { + event->dataTransfer.setDropAction(dragResponse.acceptedAction()); + } else { + event->dataTransfer.setDropAction(Qt::DropAction::IgnoreAction); + } +} + +void QWasmDrag::onNativeDrop(DragEvent *event) +{ + QWasmWindow *wasmWindow = QWasmWindow::fromWindow(event->targetWindow); + + const auto screenElementPos = dom::mapPoint( + event->target(), wasmWindow->platformScreen()->element(), event->localPoint); + const auto screenPos = + wasmWindow->platformScreen()->mapFromLocal(screenElementPos); + const QPoint targetWindowPos = event->targetWindow->mapFromGlobal(screenPos).toPoint(); + + const Qt::DropActions actions = m_dragState + ? m_dragState->drag->supportedActions() + : (Qt::DropAction::CopyAction | Qt::DropAction::MoveAction + | Qt::DropAction::LinkAction); + Qt::MouseButton mouseButton = event->mouseButton; + QFlags<Qt::KeyboardModifier> modifiers = event->modifiers; + + // Accept the native drop event: We are going to async read any dropped + // files, but the browser expects that accepted state is set before any + // async calls. + event->acceptDrop(); + + const auto dropCallback = [&m_dragState = m_dragState, wasmWindow, targetWindowPos, + actions, mouseButton, modifiers](QMimeData *mimeData) { + + auto dropResponse = std::make_shared<QPlatformDropQtResponse>(true, Qt::DropAction::CopyAction); + *dropResponse = QWindowSystemInterface::handleDrop(wasmWindow->window(), mimeData, + targetWindowPos, actions, + mouseButton, modifiers); + + if (dropResponse->isAccepted()) + m_dragState->dropAction = dropResponse->acceptedAction(); + + delete mimeData; + }; + + event->dataTransfer.toMimeDataWithFile(dropCallback); +} + +void QWasmDrag::onNativeDragFinished(DragEvent *event) +{ + m_dragState->dropAction = event->dropAction; + m_dragState->quitEventLoopClosure(); +} + +QWasmDrag::DragState::DragImage::DragImage(const QPixmap &pixmap, const QMimeData *mimeData, + QWindow *window) + : m_temporaryImageElementParent(QWasmWindow::fromWindow(window)->containerElement()) +{ + m_imageDomElement = generateDragImage(pixmap, mimeData); + + m_imageDomElement.set("className", "hidden-drag-image"); + m_temporaryImageElementParent.call<void>("appendChild", m_imageDomElement); +} + +QWasmDrag::DragState::DragImage::~DragImage() +{ + m_temporaryImageElementParent.call<void>("removeChild", m_imageDomElement); +} + +emscripten::val QWasmDrag::DragState::DragImage::generateDragImage(const QPixmap &pixmap, + const QMimeData *mimeData) +{ + if (!pixmap.isNull()) + return generateDragImageFromPixmap(pixmap); + if (mimeData->hasFormat("text/plain")) + return generateDragImageFromText(mimeData); + return generateDefaultDragImage(); +} + +emscripten::val +QWasmDrag::DragState::DragImage::generateDragImageFromText(const QMimeData *mimeData) +{ + emscripten::val dragImageElement = + emscripten::val::global("document") + .call<emscripten::val>("createElement", emscripten::val("span")); + + constexpr qsizetype MaxCharactersInDragImage = 100; + + const auto text = QString::fromUtf8(mimeData->data("text/plain")); + dragImageElement.set( + "innerText", + text.first(qMin(qsizetype(MaxCharactersInDragImage), text.length())).toStdString()); + return dragImageElement; +} + +emscripten::val QWasmDrag::DragState::DragImage::generateDefaultDragImage() +{ + emscripten::val dragImageElement = + emscripten::val::global("document") + .call<emscripten::val>("createElement", emscripten::val("div")); + + auto innerImgElement = emscripten::val::global("document") + .call<emscripten::val>("createElement", emscripten::val("img")); + innerImgElement.set("src", + "data:image/" + std::string("svg+xml") + ";base64," + + std::string(Base64IconStore::get()->getIcon( + Base64IconStore::IconType::QtLogo))); + + constexpr char DragImageSize[] = "50px"; + + dragImageElement["style"].set("width", DragImageSize); + innerImgElement["style"].set("width", DragImageSize); + dragImageElement["style"].set("display", "flex"); + + dragImageElement.call<void>("appendChild", innerImgElement); + return dragImageElement; +} + +emscripten::val QWasmDrag::DragState::DragImage::generateDragImageFromPixmap(const QPixmap &pixmap) +{ + emscripten::val dragImageElement = + emscripten::val::global("document") + .call<emscripten::val>("createElement", emscripten::val("canvas")); + dragImageElement.set("width", pixmap.width()); + dragImageElement.set("height", pixmap.height()); + + dragImageElement["style"].set( + "width", std::to_string(pixmap.width() / pixmap.devicePixelRatio()) + "px"); + dragImageElement["style"].set( + "height", std::to_string(pixmap.height() / pixmap.devicePixelRatio()) + "px"); + + auto context2d = dragImageElement.call<emscripten::val>("getContext", emscripten::val("2d")); + auto imageData = context2d.call<emscripten::val>( + "createImageData", emscripten::val(pixmap.width()), emscripten::val(pixmap.height())); + + dom::drawImageToWebImageDataArray(pixmap.toImage().convertedTo(QImage::Format::Format_RGBA8888), + imageData, QRect(0, 0, pixmap.width(), pixmap.height())); + context2d.call<void>("putImageData", imageData, emscripten::val(0), emscripten::val(0)); + + return dragImageElement; +} + +emscripten::val QWasmDrag::DragState::DragImage::htmlElement() +{ + return m_imageDomElement; +} + +QWasmDrag::DragState::DragState(QDrag *drag, QWindow *window, + std::function<void()> quitEventLoopClosure) + : drag(drag), window(window), quitEventLoopClosure(std::move(quitEventLoopClosure)) +{ +} + +QWasmDrag::DragState::~DragState() = default; + +QT_END_NAMESPACE |