// 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
// know anything about the actual tab implementation or model, as that is fairly
// application-specific. It only provides an API to be overridden by subclasses
// to fill in the details.
#import <Cocoa/Cocoa.h>
#include "base/mac/scoped_nsobject.h"
@class FastResizeView;
@class FocusTracker;
@class TabStripView;
@class TabView;
@interface TabWindowController : NSWindowController<NSWindowDelegate> {
@private
base::scoped_nsobject<FastResizeView> tabContentArea_;
base::scoped_nsobject<TabStripView> tabStripView_;
// The child window used during dragging to achieve the opacity tricks.
NSWindow* overlayWindow_;
// The contentView of the original window that is moved (for the duration
// of the drag) to the |overlayWindow_|.
NSView* originalContentView_; // weak
base::scoped_nsobject<FocusTracker> focusBeforeOverlay_;
BOOL closeDeferred_; // If YES, call performClose: in removeOverlay:.
}
@property(readonly, nonatomic) TabStripView* tabStripView;
@property(readonly, nonatomic) FastResizeView* tabContentArea;
// This is the designated initializer for this class.
- (id)initTabWindowControllerWithTabStrip:(BOOL)hasTabStrip;
// Used during tab dragging to turn on/off the overlay window when a tab
// is torn off. If -deferPerformClose (below) is used, -removeOverlay will
// cause the controller to be autoreleased before returning.
- (void)showOverlay;
- (void)removeOverlay;
- (NSWindow*)overlayWindow;
// 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 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*)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;
// Returns whether one of the window's tabs is being dragged.
- (BOOL)isDragSessionActive;
// The follow return YES if tab dragging/tab tearing (off the tab strip)/window
// movement is currently allowed. Any number of things can choose to disable it,
// such as pending animations. The default implementations always return YES.
// Subclasses should override as appropriate.
- (BOOL)tabDraggingAllowed;
- (BOOL)tabTearingAllowed;
- (BOOL)windowMovementAllowed;
// Show or hide the new tab button. The button is hidden immediately, but
// waits until the next call to |-layoutTabs| to show it again.
- (void)showNewTabButton:(BOOL)show;
// 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 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)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;
// Gets whether a particular tab is draggable between windows.
- (BOOL)isTabDraggable:(NSView*)tabView;
// Tell the window that it needs to call performClose: as soon as the current
// drag is complete. This prevents a window (and its overlay) from going away
// during a drag.
- (void)deferPerformClose;
@end
@interface TabWindowController(ProtectedMethods)
// 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_