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// Copyright 2016 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#import "ui/views/cocoa/drag_drop_client_mac.h"
#include "base/mac/mac_util.h"
#include "base/run_loop.h"
#include "base/strings/sys_string_conversions.h"
#import "components/remote_cocoa/app_shim/bridged_content_view.h"
#import "components/remote_cocoa/app_shim/native_widget_ns_window_bridge.h"
#include "ui/base/dragdrop/drag_drop_types.h"
#include "ui/base/dragdrop/mojom/drag_drop_types.mojom.h"
#import "ui/base/dragdrop/os_exchange_data_provider_mac.h"
#include "ui/gfx/image/image_skia_util_mac.h"
#include "ui/views/drag_utils.h"
#include "ui/views/widget/native_widget_mac.h"
namespace views {
DragDropClientMac::DragDropClientMac(
remote_cocoa::NativeWidgetNSWindowBridge* bridge,
View* root_view)
: drop_helper_(root_view), bridge_(bridge) {
DCHECK(bridge);
}
DragDropClientMac::~DragDropClientMac() = default;
void DragDropClientMac::StartDragAndDrop(
std::unique_ptr<ui::OSExchangeData> data,
int operation,
ui::mojom::DragEventSource source) {
exchange_data_ = std::move(data);
source_operation_ = operation;
is_drag_source_ = true;
const ui::OSExchangeDataProviderMac& provider_mac =
static_cast<const ui::OSExchangeDataProviderMac&>(
exchange_data_->provider());
// Release capture before beginning the dragging session. Capture may have
// been acquired on the mouseDown, but capture is not required during the
// dragging session and the mouseUp that would release it will be suppressed.
bridge_->ReleaseCapture();
// Synthesize an event for dragging, since we can't be sure that
// [NSApp currentEvent] will return a valid dragging event.
NSWindow* window = bridge_->ns_window();
NSEvent* event =
[NSEvent mouseEventWithType:NSEventTypeLeftMouseDragged
location:window.mouseLocationOutsideOfEventStream
modifierFlags:0
timestamp:NSApp.currentEvent.timestamp
windowNumber:window.windowNumber
context:nil
eventNumber:0
clickCount:1
pressure:1.0];
NSImage* image = gfx::NSImageFromImageSkia(provider_mac.GetDragImage());
DCHECK(!NSEqualSizes(image.size, NSZeroSize));
NSArray<NSDraggingItem*>* drag_items = provider_mac.GetDraggingItems();
if (!drag_items) {
// The source of this data is ultimately the OS, and while this shouldn't be
// nil, it is documented as possibly being so if things are broken. If so,
// fail early rather than try to start a drag of a nil item list and making
// things worse.
return;
}
// At this point the mismatch between the Views drag API, which assumes a
// single drag item, and the macOS drag API, which allows for multiple items,
// is encountered. For now, set the dragging frame and image on the first
// item, and set nil images for the remaining items. In the future, when Views
// becomes more capable in the area of the clipboard, revisit this.
// Create the frame to cause the mouse to be centered over the image, with the
// image slightly above the mouse pointer for visibility.
NSRect dragging_frame =
NSMakeRect(event.locationInWindow.x - image.size.width / 2,
event.locationInWindow.y - image.size.height / 4,
image.size.width, image.size.height);
for (NSUInteger i = 0; i < drag_items.count; ++i) {
if (i == 0) {
[drag_items[i] setDraggingFrame:dragging_frame contents:image];
} else {
[drag_items[i] setDraggingFrame:NSMakeRect(0, 0, 1, 1) contents:nil];
}
}
[bridge_->ns_view() beginDraggingSessionWithItems:drag_items
event:event
source:bridge_->ns_view()];
// Since Drag and drop is asynchronous on the Mac, spin a nested run loop for
// consistency with other platforms.
base::RunLoop run_loop(base::RunLoop::Type::kNestableTasksAllowed);
quit_closure_ = run_loop.QuitClosure();
run_loop.Run();
}
NSDragOperation DragDropClientMac::DragUpdate(id<NSDraggingInfo> sender) {
if (!exchange_data_) {
exchange_data_ = std::make_unique<OSExchangeData>(
ui::OSExchangeDataProviderMac::CreateProviderWrappingPasteboard(
sender.draggingPasteboard));
source_operation_ = ui::DragDropTypes::NSDragOperationToDragOperation(
sender.draggingSourceOperationMask);
}
last_operation_ = drop_helper_.OnDragOver(
*exchange_data_,
LocationInView(sender.draggingLocation, sender.draggingDestinationWindow),
source_operation_);
return ui::DragDropTypes::DragOperationToNSDragOperation(last_operation_);
}
NSDragOperation DragDropClientMac::Drop(id<NSDraggingInfo> sender) {
// OnDrop may delete |this|, so clear |exchange_data_| first.
std::unique_ptr<ui::OSExchangeData> exchange_data = std::move(exchange_data_);
ui::mojom::DragOperation drag_operation = drop_helper_.OnDrop(
*exchange_data, LocationInView([sender draggingLocation]),
last_operation_);
return ui::DragDropTypes::DragOperationToNSDragOperation(
static_cast<int>(drag_operation));
}
void DragDropClientMac::EndDrag() {
exchange_data_.reset();
is_drag_source_ = false;
// Allow a test to invoke EndDrag() without spinning the nested run loop.
if (!quit_closure_.is_null()) {
std::move(quit_closure_).Run();
}
}
void DragDropClientMac::DragExit() {
drop_helper_.OnDragExit();
if (!is_drag_source_) {
exchange_data_.reset();
}
}
gfx::Point DragDropClientMac::LocationInView(NSPoint point) const {
NSRect content_rect =
[bridge_->ns_window() contentRectForFrameRect:bridge_->ns_window().frame];
return gfx::Point(point.x, NSHeight(content_rect) - point.y);
}
// In immersive fullscreen, the `NSToolbarFullScreenWindow` hosts both the tab
// strip and toolbar. Convert the point to the corresponding hosted view's
// coordinates.
gfx::Point DragDropClientMac::LocationInView(
NSPoint point,
NSWindow* destination_window) const {
if (remote_cocoa::IsNSToolbarFullScreenWindow(destination_window)) {
NSView* overlay_view = [destination_window.contentView hitTest:point];
point = [overlay_view convertPoint:point fromView:nil];
}
return LocationInView(point);
}
} // namespace views
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