content/browser/web_contents/web_drag_dest_mac.mm

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #import "content/browser/web_contents/web_drag_dest_mac.h"
   6
   7 #import <Carbon/Carbon.h>
   8
   9 #include "base/strings/sys_string_conversions.h"
  10 #include "content/browser/renderer_host/render_view_host_impl.h"
  11 #include "content/browser/web_contents/web_contents_impl.h"
  12 #include "content/public/browser/web_contents_delegate.h"
  13 #include "content/public/browser/web_drag_dest_delegate.h"
  14 #include "content/public/common/drop_data.h"
  15 #include "third_party/WebKit/public/web/WebInputEvent.h"
  16 #import "third_party/mozilla/NSPasteboard+Utils.h"
  17 #include "ui/base/clipboard/custom_data_helper.h"
  18 #import "ui/base/dragdrop/cocoa_dnd_util.h"
  19 #include "ui/base/window_open_disposition.h"
  20
  21 using blink::WebDragOperationsMask;
  22 using content::DropData;
  23 using content::OpenURLParams;
  24 using content::Referrer;
  25 using content::WebContentsImpl;
  26
  27 namespace {
  28
  29 int GetModifierFlags() {
  30   int modifier_state = 0;
  31   UInt32 currentModifiers = GetCurrentKeyModifiers();
  32   if (currentModifiers & ::shiftKey)
  33     modifier_state |= blink::WebInputEvent::ShiftKey;
  34   if (currentModifiers & ::controlKey)
  35     modifier_state |= blink::WebInputEvent::ControlKey;
  36   if (currentModifiers & ::optionKey)
  37     modifier_state |= blink::WebInputEvent::AltKey;
  38   if (currentModifiers & ::cmdKey)
  39       modifier_state |= blink::WebInputEvent::MetaKey;
  40
  41   // The return value of 1 << 0 corresponds to the left mouse button,
  42   // 1 << 1 corresponds to the right mouse button,
  43   // 1 << n, n >= 2 correspond to other mouse buttons.
  44   NSUInteger pressedButtons = [NSEvent pressedMouseButtons];
  45
  46   if (pressedButtons & (1 << 0))
  47       modifier_state |= blink::WebInputEvent::LeftButtonDown;
  48   if (pressedButtons & (1 << 1))
  49       modifier_state |= blink::WebInputEvent::RightButtonDown;
  50   if (pressedButtons & (1 << 2))
  51       modifier_state |= blink::WebInputEvent::MiddleButtonDown;
  52
  53   return modifier_state;
  54 }
  55
  56 }  // namespace
  57
  58 @implementation WebDragDest
  59
  60 // |contents| is the WebContentsImpl representing this tab, used to communicate
  61 // drag&drop messages to WebCore and handle navigation on a successful drop
  62 // (if necessary).
  63 - (id)initWithWebContentsImpl:(WebContentsImpl*)contents {
  64   if ((self = [super init])) {
  65     webContents_ = contents;
  66     canceled_ = false;
  67   }
  68   return self;
  69 }
  70
  71 - (DropData*)currentDropData {
  72   return dropData_.get();
  73 }
  74
  75 - (void)setDragDelegate:(content::WebDragDestDelegate*)delegate {
  76   delegate_ = delegate;
  77 }
  78
  79 // Call to set whether or not we should allow the drop. Takes effect the
  80 // next time |-draggingUpdated:| is called.
  81 - (void)setCurrentOperation:(NSDragOperation)operation {
  82   currentOperation_ = operation;
  83 }
  84
  85 // Given a point in window coordinates and a view in that window, return a
  86 // flipped point in the coordinate system of |view|.
  87 - (NSPoint)flipWindowPointToView:(const NSPoint&)windowPoint
  88                             view:(NSView*)view {
  89   DCHECK(view);
  90   NSPoint viewPoint =  [view convertPoint:windowPoint fromView:nil];
  91   NSRect viewFrame = [view frame];
  92   viewPoint.y = viewFrame.size.height - viewPoint.y;
  93   return viewPoint;
  94 }
  95
  96 // Given a point in window coordinates and a view in that window, return a
  97 // flipped point in screen coordinates.
  98 - (NSPoint)flipWindowPointToScreen:(const NSPoint&)windowPoint
  99                               view:(NSView*)view {
 100   DCHECK(view);
 101   NSPoint screenPoint = [[view window] convertBaseToScreen:windowPoint];
 102   NSScreen* screen = [[view window] screen];
 103   NSRect screenFrame = [screen frame];
 104   screenPoint.y = screenFrame.size.height - screenPoint.y;
 105   return screenPoint;
 106 }
 107
 108 // Return YES if the drop site only allows drops that would navigate.  If this
 109 // is the case, we don't want to pass messages to the renderer because there's
 110 // really no point (i.e., there's nothing that cares about the mouse position or
 111 // entering and exiting).  One example is an interstitial page (e.g., safe
 112 // browsing warning).
 113 - (BOOL)onlyAllowsNavigation {
 114   return webContents_->ShowingInterstitialPage();
 115 }
 116
 117 // Messages to send during the tracking of a drag, usually upon receiving
 118 // calls from the view system. Communicates the drag messages to WebCore.
 119
 120 - (NSDragOperation)draggingEntered:(id<NSDraggingInfo>)info
 121                               view:(NSView*)view {
 122   // Save off the RVH so we can tell if it changes during a drag. If it does,
 123   // we need to send a new enter message in draggingUpdated:.
 124   currentRVH_ = webContents_->GetRenderViewHost();
 125
 126   // Fill out a DropData from pasteboard.
 127   scoped_ptr<DropData> dropData;
 128   dropData.reset(new DropData());
 129   [self populateDropData:dropData.get()
 130              fromPasteboard:[info draggingPasteboard]];
 131
 132   NSDragOperation mask = [info draggingSourceOperationMask];
 133
 134   // Give the delegate an opportunity to cancel the drag.
 135   canceled_ = !webContents_->GetDelegate()->CanDragEnter(
 136       webContents_,
 137       *dropData,
 138       static_cast<WebDragOperationsMask>(mask));
 139   if (canceled_)
 140     return NSDragOperationNone;
 141
 142   if ([self onlyAllowsNavigation]) {
 143     if ([[info draggingPasteboard] containsURLData])
 144       return NSDragOperationCopy;
 145     return NSDragOperationNone;
 146   }
 147
 148   if (delegate_) {
 149     delegate_->DragInitialize(webContents_);
 150     delegate_->OnDragEnter();
 151   }
 152
 153   dropData_.swap(dropData);
 154
 155   // Create the appropriate mouse locations for WebCore. The draggingLocation
 156   // is in window coordinates. Both need to be flipped.
 157   NSPoint windowPoint = [info draggingLocation];
 158   NSPoint viewPoint = [self flipWindowPointToView:windowPoint view:view];
 159   NSPoint screenPoint = [self flipWindowPointToScreen:windowPoint view:view];
 160   webContents_->GetRenderViewHost()->DragTargetDragEnter(
 161       *dropData_,
 162       gfx::Point(viewPoint.x, viewPoint.y),
 163       gfx::Point(screenPoint.x, screenPoint.y),
 164       static_cast<WebDragOperationsMask>(mask),
 165       GetModifierFlags());
 166
 167   // We won't know the true operation (whether the drag is allowed) until we
 168   // hear back from the renderer. For now, be optimistic:
 169   currentOperation_ = NSDragOperationCopy;
 170   return currentOperation_;
 171 }
 172
 173 - (void)draggingExited:(id<NSDraggingInfo>)info {
 174   DCHECK(currentRVH_);
 175   if (currentRVH_ != webContents_->GetRenderViewHost())
 176     return;
 177
 178   if (canceled_)
 179     return;
 180
 181   if ([self onlyAllowsNavigation])
 182     return;
 183
 184   if (delegate_)
 185     delegate_->OnDragLeave();
 186
 187   webContents_->GetRenderViewHost()->DragTargetDragLeave();
 188   dropData_.reset();
 189 }
 190
 191 - (NSDragOperation)draggingUpdated:(id<NSDraggingInfo>)info
 192                               view:(NSView*)view {
 193   DCHECK(currentRVH_);
 194   if (currentRVH_ != webContents_->GetRenderViewHost())
 195     [self draggingEntered:info view:view];
 196
 197   if (canceled_)
 198     return NSDragOperationNone;
 199
 200   if ([self onlyAllowsNavigation]) {
 201     if ([[info draggingPasteboard] containsURLData])
 202       return NSDragOperationCopy;
 203     return NSDragOperationNone;
 204   }
 205
 206   // Create the appropriate mouse locations for WebCore. The draggingLocation
 207   // is in window coordinates.
 208   NSPoint windowPoint = [info draggingLocation];
 209   NSPoint viewPoint = [self flipWindowPointToView:windowPoint view:view];
 210   NSPoint screenPoint = [self flipWindowPointToScreen:windowPoint view:view];
 211   NSDragOperation mask = [info draggingSourceOperationMask];
 212   webContents_->GetRenderViewHost()->DragTargetDragOver(
 213       gfx::Point(viewPoint.x, viewPoint.y),
 214       gfx::Point(screenPoint.x, screenPoint.y),
 215       static_cast<WebDragOperationsMask>(mask),
 216       GetModifierFlags());
 217
 218   if (delegate_)
 219     delegate_->OnDragOver();
 220
 221   return currentOperation_;
 222 }
 223
 224 - (BOOL)performDragOperation:(id<NSDraggingInfo>)info
 225                               view:(NSView*)view {
 226   if (currentRVH_ != webContents_->GetRenderViewHost())
 227     [self draggingEntered:info view:view];
 228
 229   // Check if we only allow navigation and navigate to a url on the pasteboard.
 230   if ([self onlyAllowsNavigation]) {
 231     NSPasteboard* pboard = [info draggingPasteboard];
 232     if ([pboard containsURLData]) {
 233       GURL url;
 234       ui::PopulateURLAndTitleFromPasteboard(&url, NULL, pboard, YES);
 235       webContents_->OpenURL(OpenURLParams(
 236           url, Referrer(), CURRENT_TAB, ui::PAGE_TRANSITION_AUTO_BOOKMARK,
 237           false));
 238       return YES;
 239     } else {
 240       return NO;
 241     }
 242   }
 243
 244   if (delegate_)
 245     delegate_->OnDrop();
 246
 247   currentRVH_ = NULL;
 248
 249   // Create the appropriate mouse locations for WebCore. The draggingLocation
 250   // is in window coordinates. Both need to be flipped.
 251   NSPoint windowPoint = [info draggingLocation];
 252   NSPoint viewPoint = [self flipWindowPointToView:windowPoint view:view];
 253   NSPoint screenPoint = [self flipWindowPointToScreen:windowPoint view:view];
 254   webContents_->GetRenderViewHost()->DragTargetDrop(
 255       gfx::Point(viewPoint.x, viewPoint.y),
 256       gfx::Point(screenPoint.x, screenPoint.y),
 257       GetModifierFlags());
 258
 259   dropData_.reset();
 260
 261   return YES;
 262 }
 263
 264 // Given |data|, which should not be nil, fill it in using the contents of the
 265 // given pasteboard. The types handled by this method should be kept in sync
 266 // with [WebContentsViewCocoa registerDragTypes].
 267 - (void)populateDropData:(DropData*)data
 268           fromPasteboard:(NSPasteboard*)pboard {
 269   DCHECK(data);
 270   DCHECK(pboard);
 271   NSArray* types = [pboard types];
 272
 273   data->did_originate_from_renderer =
 274       [types containsObject:ui::kChromeDragDummyPboardType];
 275
 276   // Get URL if possible. To avoid exposing file system paths to web content,
 277   // filenames in the drag are not converted to file URLs.
 278   ui::PopulateURLAndTitleFromPasteboard(&data->url,
 279                                         &data->url_title,
 280                                         pboard,
 281                                         NO);
 282
 283   // Get plain text.
 284   if ([types containsObject:NSStringPboardType]) {
 285     data->text = base::NullableString16(
 286         base::SysNSStringToUTF16([pboard stringForType:NSStringPboardType]),
 287         false);
 288   }
 289
 290   // Get HTML. If there's no HTML, try RTF.
 291   if ([types containsObject:NSHTMLPboardType]) {
 292     NSString* html = [pboard stringForType:NSHTMLPboardType];
 293     data->html = base::NullableString16(base::SysNSStringToUTF16(html), false);
 294   } else if ([types containsObject:ui::kChromeDragImageHTMLPboardType]) {
 295     NSString* html = [pboard stringForType:ui::kChromeDragImageHTMLPboardType];
 296     data->html = base::NullableString16(base::SysNSStringToUTF16(html), false);
 297   } else if ([types containsObject:NSRTFPboardType]) {
 298     NSString* html = [pboard htmlFromRtf];
 299     data->html = base::NullableString16(base::SysNSStringToUTF16(html), false);
 300   }
 301
 302   // Get files.
 303   if ([types containsObject:NSFilenamesPboardType]) {
 304     NSArray* files = [pboard propertyListForType:NSFilenamesPboardType];
 305     if ([files isKindOfClass:[NSArray class]] && [files count]) {
 306       for (NSUInteger i = 0; i < [files count]; i++) {
 307         NSString* filename = [files objectAtIndex:i];
 308         BOOL exists = [[NSFileManager defaultManager]
 309                            fileExistsAtPath:filename];
 310         if (exists) {
 311           data->filenames.push_back(ui::FileInfo(
 312               base::FilePath::FromUTF8Unsafe(base::SysNSStringToUTF8(filename)),
 313               base::FilePath()));
 314         }
 315       }
 316     }
 317   }
 318
 319   // TODO(pinkerton): Get file contents. http://crbug.com/34661
 320
 321   // Get custom MIME data.
 322   if ([types containsObject:ui::kWebCustomDataPboardType]) {
 323     NSData* customData = [pboard dataForType:ui::kWebCustomDataPboardType];
 324     ui::ReadCustomDataIntoMap([customData bytes],
 325                               [customData length],
 326                               &data->custom_data);
 327   }
 328 }
 329
 330 @end