[mac] Implement dragging of multiple tabs.

chrome/browser/ui/cocoa/tabs/tab_window_controller.h

 // Copyright (c) 2012 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.
 
 #ifndef CHROME_BROWSER_UI_COCOA_TABS_TAB_WINDOW_CONTROLLER_H_
 #define CHROME_BROWSER_UI_COCOA_TABS_TAB_WINDOW_CONTROLLER_H_
 
 // A class acting as the Objective-C window controller for a window that has
 // tabs which can be dragged around. Tabs can be re-arranged within the same
 // window or dragged into other TabWindowController windows. This class doesn't
@@ skipping 41 matching lines @@
 // Returns YES if it is ok to constrain the window's frame to fit the screen.
 - (BOOL)shouldConstrainFrameRect;
 
 // A collection of methods, stubbed out in this base class, that provide
 // the implementation of tab dragging based on whatever model is most
 // appropriate.
 
 // Layout the tabs based on the current ordering of the model.
 - (void)layoutTabs;
 
-// Creates a new window by pulling the given tab out and placing it in
+// Creates a new window by pulling the given tabs out and placing it in
 // the new window. Returns the controller for the new window. The size of the
 // new window will be the same size as this window.
-- (TabWindowController*)detachTabToNewWindow:(TabView*)tabView;
+- (TabWindowController*)detachTabsToNewWindow:(NSArray*)tabViews
+                                   draggedTab:(NSView*)draggedTab;
 
 // Make room in the tab strip for |tab| at the given x coordinate. Will hide the
 // new tab button while there's a placeholder. Subclasses need to call the
 // superclass implementation.
 - (void)insertPlaceholderForTab:(TabView*)tab frame:(NSRect)frame;
 
 // Removes the placeholder installed by |-insertPlaceholderForTab:atLocation:|
 // and restores the new tab button. Subclasses need to call the superclass
 // implementation.
 - (void)removePlaceholder;
@@ skipping 16 matching lines @@
 // Returns whether or not |tab| can still be fully seen in the tab strip or if
 // its current position would cause it be obscured by things such as the edge
 // of the window or the window decorations. Returns YES only if the entire tab
 // is visible. The default implementation always returns YES.
 - (BOOL)isTabFullyVisible:(TabView*)tab;
 
 // Called to check if the receiver can receive dragged tabs from
 // source.  Return YES if so.  The default implementation returns NO.
 - (BOOL)canReceiveFrom:(TabWindowController*)source;
 
-// Move a given tab view to the location of the current placeholder. If there is
+// Move given tab views to the location of the current placeholder. If there is
 // no placeholder, it will go at the end. |controller| is the window controller
 // of a tab being dropped from a different window. It will be nil if the drag is
 // within the window, otherwise the tab is removed from that window before being
 // placed into this one. The implementation will call |-removePlaceholder| since
 // the drag is now complete.  This also calls |-layoutTabs| internally so
 // clients do not need to call it again.
-- (void)moveTabView:(NSView*)view
-     fromController:(TabWindowController*)controller;
+- (void)moveTabViews:(NSArray*)views
+      fromController:(TabWindowController*)controller;
 
 // Number of tabs in the tab strip. Useful, for example, to know if we're
 // dragging the only tab in the window. This includes pinned tabs (both live
 // and not).
 - (NSInteger)numberOfTabs;
 
 // YES if there are tabs in the tab strip which have content, allowing for
 // the notion of tabs in the tab strip that are placeholders but currently have
 // no content.
 - (BOOL)hasLiveTabs;
 
+// Returns all tab views.
+- (NSArray*)tabViews;
+
 // Return the view of the active tab.
 - (NSView*)activeTabView;
 
 // The title of the active tab.
 - (NSString*)activeTabTitle;
 
 // Called to check whether or not this controller's window has a tab strip (YES
 // if it does, NO otherwise). The default implementation returns YES.
 - (BOOL)hasTabStrip;
 
@@ skipping 11 matching lines @@
 // Tells the tab strip to forget about this tab in preparation for it being
 // put into a different tab strip, such as during a drop on another window.
 - (void)detachTabView:(NSView*)view;
 
 // Called when the size of the window content area has changed. Override to
 // position specific views. Base class implementation does nothing.
 - (void)layoutSubviews;
 @end
 
 #endif  // CHROME_BROWSER_UI_COCOA_TABS_TAB_WINDOW_CONTROLLER_H_