MacViews: Implemented Drag & Drop

ui/base/dragdrop/os_exchange_data_provider_mac.mm

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/base/dragdrop/os_exchange_data_provider_mac.h"
 
 #import <Cocoa/Cocoa.h>
 
 #include "base/logging.h"
+#include "base/memory/ptr_util.h"
 #include "base/pickle.h"
 #include "base/strings/sys_string_conversions.h"
 #include "base/strings/utf_string_conversions.h"
 #import "third_party/mozilla/NSPasteboard+Utils.h"
 #import "ui/base/clipboard/clipboard_util_mac.h"
+#import "ui/base/dragdrop/cocoa_dnd_util.h"
 #include "url/gurl.h"
 
+namespace {
+
+// The MIME type for the clipboard format for OSExchangeData.
+const std::string kClipboardFormatString = "chromium/x-os-exchange-data";

[tapted, 2016/05/31 11:49:57]

I don't really understand this bit -- what's the use case for the PickleData? Is
one of the kMimeTypeFoo constants in ui/base/clipboard/clipboard.h or
ui/base/clipboard/custom_data_helper.h a better fit?

[spqchan, 2016/05/31 23:06:12]

Ah, good point. I switched to kWebCustomDataPboardType.
PickleData is pretty much custom data, and is currently used by
BrowserActionDragData

+
+}  // namespace
+
 namespace ui {
 
 OSExchangeDataProviderMac::OSExchangeDataProviderMac()
     : pasteboard_(new ui::UniquePasteboard) {}
 
 OSExchangeDataProviderMac::OSExchangeDataProviderMac(
     scoped_refptr<ui::UniquePasteboard> pb)
     : pasteboard_(pb) {}
 
 OSExchangeDataProviderMac::~OSExchangeDataProviderMac() {
@@ skipping 135 matching lines @@
 
 bool OSExchangeDataProviderMac::HasFile() const {
   return [[pasteboard_->get() types] containsObject:NSFilenamesPboardType];
 }
 
 bool OSExchangeDataProviderMac::HasCustomFormat(
     const Clipboard::FormatType& format) const {
   return [[pasteboard_->get() types] containsObject:format.ToNSString()];
 }
 
+void OSExchangeDataProviderMac::SetDragImage(
+    const gfx::ImageSkia& image,
+    const gfx::Vector2d& cursor_offset) {
+  drag_image_ = image;
+  cursor_offset_ = cursor_offset;
+}
+
+const gfx::ImageSkia& OSExchangeDataProviderMac::GetDragImage() const {
+  return drag_image_;
+}
+
+const gfx::Vector2d& OSExchangeDataProviderMac::GetDragImageOffset() const {
+  return cursor_offset_;
+}
+
+NSData* OSExchangeDataProviderMac::GetNSDataForType(NSString* type) const {
+  return [pasteboard_->get() dataForType:type];
+}
+
+std::unique_ptr<OSExchangeData>
+OSExchangeDataProviderMac::CreateDataFromPasteboard(NSPasteboard* pasteboard) {
+  OSExchangeDataProviderMac* provider = new OSExchangeDataProviderMac();
+
+  for (NSPasteboardItem* item in [pasteboard pasteboardItems])
+    ClipboardUtil::AddDataToPasteboard(provider->pasteboard_->get(), item);
+
+  return base::WrapUnique(new OSExchangeData(provider));
+}
+
+NSArray* OSExchangeDataProviderMac::SupportedPasteboardTypes() {
+  return @[
+    base::SysUTF8ToNSString(kClipboardFormatString),
+    ui::ClipboardUtil::UTIForWebURLsAndTitles(), NSURLPboardType,
+    NSPasteboardTypeString, NSFilenamesPboardType
+  ];
+}
+
 ///////////////////////////////////////////////////////////////////////////////
 // OSExchangeData, public:
 
 // static
 OSExchangeData::Provider* OSExchangeData::CreateProvider() {
   return new OSExchangeDataProviderMac;
 }
 
 }  // namespace ui