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// Copyright 2013 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/download/drag_download_item.h"
#import <Cocoa/Cocoa.h>
#include "base/apple/foundation_util.h"
#include "components/download/public/common/download_item.h"
#include "ui/gfx/image/image.h"
#include "ui/gfx/native_widget_types.h"
#include "ui/views/widget/widget.h"
// Cocoa intends a smart dragging source, while `DragDownloadItem()` is a simple
// "start dragging this" fire-and-forget. This is a generic source just good
// enough to satisfy AppKit.
@interface DragDownloadItemSource : NSObject<NSDraggingSource>
@end
@implementation DragDownloadItemSource
- (NSDragOperation)draggingSession:(NSDraggingSession*)session
sourceOperationMaskForDraggingContext:(NSDraggingContext)context {
return NSDragOperationEvery;
}
@end
namespace {
id<NSDraggingSource> GetDraggingSource() {
static id<NSDraggingSource> source = [[DragDownloadItemSource alloc] init];
return source;
}
} // namespace
void DragDownloadItem(const download::DownloadItem* download,
const gfx::Image* icon,
gfx::NativeView native_view) {
DCHECK_EQ(download::DownloadItem::COMPLETE, download->GetState());
DCHECK(native_view);
NSView* view = native_view.GetNativeNSView();
NSPoint current_position = view.window.mouseLocationOutsideOfEventStream;
current_position =
[view backingAlignedRect:NSMakeRect(current_position.x,
current_position.y, 0, 0)
options:NSAlignAllEdgesOutward]
.origin;
// If this drag was initiated from a views::Widget, that widget may have
// mouse capture. Drags via View::DoDrag() usually release it. The code below
// bypasses that, so release manually. See https://crbug.com/863377.
views::Widget* widget =
views::Widget::GetWidgetForNativeView(gfx::NativeView(view));
if (widget)
widget->ReleaseCapture();
NSURL* file_url = base::apple::FilePathToNSURL(download->GetTargetFilePath());
NSDraggingItem* file_item =
[[NSDraggingItem alloc] initWithPasteboardWriter:file_url];
if (icon) {
NSImage* file_image = icon->ToNSImage();
NSSize image_size = file_image.size;
NSRect image_rect = NSMakeRect(current_position.x - image_size.width / 2,
current_position.y - image_size.height / 2,
image_size.width, image_size.height);
[file_item setDraggingFrame:image_rect contents:file_image];
} else {
// 16x16 placeholder, corresponding to IconLoader::IconSize::SMALL.
NSRect placeholder_rect =
NSMakeRect(current_position.x - 8, current_position.y - 8, 16, 16);
[file_item setDraggingFrame:placeholder_rect contents:nil];
}
// Synthesize a drag event, since we don't have access to the actual event
// that initiated a drag (possibly consumed by the Web UI, for example).
NSEvent* dragEvent = [NSEvent mouseEventWithType:NSEventTypeLeftMouseDragged
location:current_position
modifierFlags:0
timestamp:NSApp.currentEvent.timestamp
windowNumber:view.window.windowNumber
context:nil
eventNumber:0
clickCount:1
pressure:1.0];
// Run the drag operation.
[view beginDraggingSessionWithItems:@[ file_item ]
event:dragEvent
source:GetDraggingSource()];
}
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