DO NOT COMMIT: [Mac] Refactor keyboard shortcut handling so it can be reused in Views.

chrome/browser/ui/cocoa/chrome_event_processing_window.mm

Index: chrome/browser/ui/cocoa/chrome_event_processing_window.mm
diff --git a/chrome/browser/ui/cocoa/chrome_event_processing_window.mm b/chrome/browser/ui/cocoa/chrome_event_processing_window.mm
index 4dd2c644a574850fc78ae54c78c0da9b3a7c252b..6f27d46893af42b32bbb5be44528ba68c8ea0f48 100644
--- a/chrome/browser/ui/cocoa/chrome_event_processing_window.mm
+++ b/chrome/browser/ui/cocoa/chrome_event_processing_window.mm
@@ -5,184 +5,65 @@
 #import "chrome/browser/ui/cocoa/chrome_event_processing_window.h"
 
 #include "base/logging.h"
-#include "chrome/browser/global_keyboard_shortcuts_mac.h"
-#include "chrome/browser/ui/browser_commands.h"
-#include "chrome/browser/ui/browser_finder.h"
-#import "chrome/browser/ui/cocoa/browser_window_controller_private.h"
-#import "chrome/browser/ui/cocoa/tabs/tab_strip_controller.h"
-#import "content/public/browser/render_widget_host_view_mac_base.h"
-
-namespace {
-
-// Type of functions listed in global_keyboard_shortcuts_mac.h.
-typedef int (*KeyToCommandMapper)(bool, bool, bool, bool, int, unichar);
-
-// If the event is for a Browser window, and the key combination has an
-// associated command, execute the command.
-bool HandleExtraKeyboardShortcut(
-    NSEvent* event,
-    NSWindow* window,
-    KeyToCommandMapper command_for_keyboard_shortcut) {
-  // Extract info from |event|.
-  NSUInteger modifers = [event modifierFlags];
-  const bool command = modifers & NSCommandKeyMask;
-  const bool shift = modifers & NSShiftKeyMask;
-  const bool control = modifers & NSControlKeyMask;
-  const bool option = modifers & NSAlternateKeyMask;
-  const int key_code = [event keyCode];
-  const unichar key_char = KeyCharacterForEvent(event);
-
-  int cmd = command_for_keyboard_shortcut(command, shift, control, option,
-                                          key_code, key_char);
-
-  if (cmd == -1)
-    return false;
-
-  // Only handle event if this is a browser window.
-  Browser* browser = chrome::FindBrowserWithWindow(window);
-  if (!browser)
-    return false;
-
-  chrome::ExecuteCommand(browser, cmd);
-  return true;
-}
-
-bool HandleExtraWindowKeyboardShortcut(NSEvent* event, NSWindow* window) {
-  return HandleExtraKeyboardShortcut(event, window,
-                                     CommandForWindowKeyboardShortcut);
-}
+#import "chrome/browser/ui/cocoa/chrome_command_dispatcher_delegate.h"
 
-bool HandleDelayedWindowKeyboardShortcut(NSEvent* event, NSWindow* window) {
-  return HandleExtraKeyboardShortcut(event, window,
-                                     CommandForDelayedWindowKeyboardShortcut);
-}
-
-bool HandleExtraBrowserKeyboardShortcut(NSEvent* event, NSWindow* window) {
-  return HandleExtraKeyboardShortcut(event, window,
-                                     CommandForBrowserKeyboardShortcut);
-}
+@implementation ChromeEventProcessingWindow
 
-// Duplicate the given key event, but changing the associated window.
-NSEvent* KeyEventForWindow(NSWindow* window, NSEvent* event) {
-  NSEventType event_type = [event type];
-
-  // Convert the event's location from the original window's coordinates into
-  // our own.
-  NSPoint location = [event locationInWindow];
-  location = [[event window] convertBaseToScreen:location];
-  location = [window convertScreenToBase:location];
-
-  // Various things *only* apply to key down/up.
-  bool is_a_repeat = false;
-  NSString* characters = nil;
-  NSString* charactors_ignoring_modifiers = nil;
-  if (event_type == NSKeyDown || event_type == NSKeyUp) {
-    is_a_repeat = [event isARepeat];
-    characters = [event characters];
-    charactors_ignoring_modifiers = [event charactersIgnoringModifiers];
+- (instancetype)initWithContentRect:(NSRect)contentRect
+                          styleMask:(NSUInteger)windowStyle
+                            backing:(NSBackingStoreType)bufferingType
+                              defer:(BOOL)deferCreation {
+  if ((self = [super initWithContentRect:contentRect
+                               styleMask:windowStyle
+                                 backing:bufferingType
+                                   defer:deferCreation])) {
+    commandDispatcher_.reset([[CommandDispatcher alloc] initWithOwner:self]);
+    commandDispatcherDelegate_.reset(
+        [[ChromeCommandDispatcherDelegate alloc] init]);
+    [commandDispatcher_ setDelegate:commandDispatcherDelegate_];
+    [self setCommandHandler:commandDispatcherDelegate_];
   }
-
-  // This synthesis may be slightly imperfect: we provide nil for the context,
-  // since I (viettrungluu) am sceptical that putting in the original context
-  // (if one is given) is valid.
-  return [NSEvent keyEventWithType:event_type
-                          location:location
-                     modifierFlags:[event modifierFlags]
-                         timestamp:[event timestamp]
-                      windowNumber:[window windowNumber]
-                           context:nil
-                        characters:characters
-       charactersIgnoringModifiers:charactors_ignoring_modifiers
-                         isARepeat:is_a_repeat
-                           keyCode:[event keyCode]];
+  return self;
 }
 
-}  // namespace
-
-@implementation ChromeEventProcessingWindow
-
 - (BOOL)handleExtraKeyboardShortcut:(NSEvent*)event {
-  return HandleExtraBrowserKeyboardShortcut(event, self) ||
-         HandleExtraWindowKeyboardShortcut(event, self) ||
-         HandleDelayedWindowKeyboardShortcut(event, self);
+  return [commandDispatcherDelegate_ handleExtraKeyboardShortcut:event
+                                                          window:self];
 }
 
-- (BOOL)performKeyEquivalent:(NSEvent*)event {
-  // Some extension commands have higher priority than web content, and some
-  // have lower priority. Regardless of whether the event is being
-  // redispatched, let the extension system try to handle the event.
-  NSWindow* window = event.window;
-  if (window) {
-    BrowserWindowController* controller = [window windowController];
-    if ([controller respondsToSelector:@selector(handledByExtensionCommand:
-                                                                  priority:)]) {
-      ui::AcceleratorManager::HandlerPriority priority =
-          redispatchingEvent_ ? ui::AcceleratorManager::kNormalPriority
-                              : ui::AcceleratorManager::kHighPriority;
-      if ([controller handledByExtensionCommand:event priority:priority])
-        return YES;
-    }
-  }
+// CommandDispatchingWindow implementation.
 
-  if (redispatchingEvent_)
-    return NO;
+@synthesize commandHandler;
 
-  // Give the web site a chance to handle the event. If it doesn't want to
-  // handle it, it will call us back with one of the |handle*| methods above.
-  NSResponder* r = [self firstResponder];
-  if ([r conformsToProtocol:@protocol(RenderWidgetHostViewMacBase)])
-    return [r performKeyEquivalent:event];
+- (BOOL)redispatchKeyEvent:(NSEvent*)event {
+  return [commandDispatcher_ redispatchKeyEvent:event];
+}
 
-  // Handle per-window shortcuts like cmd-1, but do not handle browser-level
-  // shortcuts like cmd-left (else, cmd-left would do history navigation even
-  // if e.g. the Omnibox has focus).
-  if (HandleExtraWindowKeyboardShortcut(event, self))
-    return YES;
+- (BOOL)defaultPerformKeyEquivalent:(NSEvent*)event {
+  return [super performKeyEquivalent:event];
+}
 
-  if ([super performKeyEquivalent:event])
-    return YES;
+- (BOOL)validateUserInterfaceItem:(id<NSValidatedUserInterfaceItem>)item {
+  return [[self commandHandler] validateUserInterfaceItem:item window:self];
+}
 
-  // Handle per-window shortcuts like Esc after giving everybody else a chance
-  // to handle them
-  return HandleDelayedWindowKeyboardShortcut(event, self);
+- (void)commandDispatch:(id)sender {
+  [[self commandHandler] commandDispatch:sender window:self];
 }
 
-- (BOOL)redispatchKeyEvent:(NSEvent*)event {
-  DCHECK(event);
-  NSEventType eventType = [event type];
-  if (eventType != NSKeyDown &&
-      eventType != NSKeyUp &&
-      eventType != NSFlagsChanged) {
-    NOTREACHED();
-    return YES;  // Pretend it's been handled in an effort to limit damage.
-  }
+- (void)commandDispatchUsingKeyModifiers:(id)sender {
+  [[self commandHandler] commandDispatchUsingKeyModifiers:sender window:self];
+}
 
-  // Ordinarily, the event's window should be this window. However, when
-  // switching between normal and fullscreen mode, we switch out the window, and
-  // the event's window might be the previous window (or even an earlier one if
-  // the renderer is running slowly and several mode switches occur). In this
-  // rare case, we synthesize a new key event so that its associate window
-  // (number) is our own.
-  if ([event window] != self)
-    event = KeyEventForWindow(self, event);
-
-  // Redispatch the event.
-  eventHandled_ = YES;
-  redispatchingEvent_ = YES;
-  [NSApp sendEvent:event];
-  redispatchingEvent_ = NO;
-
-  // If the event was not handled by [NSApp sendEvent:], the sendEvent:
-  // method below will be called, and because |redispatchingEvent_| is YES,
-  // |eventHandled_| will be set to NO.
-  return eventHandled_;
+// NSWindow overrides.
+
+- (BOOL)performKeyEquivalent:(NSEvent*)event {
+  return [commandDispatcher_ performKeyEquivalent:event];
 }
 
 - (void)sendEvent:(NSEvent*)event {
-  if (!redispatchingEvent_)
+  if (![commandDispatcher_ preSendEvent:event])
     [super sendEvent:event];
-  else
-    eventHandled_ = NO;
 }
 
 @end  // ChromeEventProcessingWindow