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autocomplete_text_field.h

// Copyright (c) 2009 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_COCOA_AUTOCOMPLETE_TEXT_FIELD_H_
#define CHROME_BROWSER_COCOA_AUTOCOMPLETE_TEXT_FIELD_H_

#import <Cocoa/Cocoa.h>

#include "base/cocoa_protocols_mac.h"
#include "base/scoped_nsobject.h"
#import "chrome/browser/cocoa/styled_text_field.h"
#import "chrome/browser/cocoa/url_drop_target.h"

@class AutocompleteTextFieldCell;

// AutocompleteTextField intercepts UI actions for forwarding to
// AutocompleteEditViewMac (*), and provides a custom look.  It works
// together with AutocompleteTextFieldEditor (mostly for intercepting
// user actions) and AutocompleteTextFieldCell (mostly for custom
// drawing).
//
// For historical reasons, chrome/browser/autocomplete is the core
// implementation of the Omnibox.  Chrome code seems to vary between
// autocomplete and Omnibox in describing this.
//
// (*) AutocompleteEditViewMac is a view in the MVC sense for the
// Chrome internals, though it's really more of a mish-mash of model,
// view, and controller.

// Provides a hook so that we can call directly down to
// AutocompleteEditViewMac rather than traversing the delegate chain.
class AutocompleteTextFieldObserver {
 public:
  // Called when the control-key state changes while the field is
  // first responder.
  virtual void OnControlKeyChanged(bool pressed) = 0;

  // Called when the user pastes into the field.
  virtual void OnPaste() = 0;

  // Called when the user copies the text.
  virtual void OnCopy() = 0;

  // Returns true if the current clipboard text supports paste and go
  // (or paste and search).
  virtual bool CanPasteAndGo() = 0;

  // Returns the appropriate "Paste and Go" or "Paste and Search"
  // context menu string, depending on what is currently in the
  // clipboard.  Must not be called unless CanPasteAndGo() returns
  // true.
  virtual int GetPasteActionStringId() = 0;

  // Called when the user initiates a "paste and go" or "paste and
  // search" into the field.
  virtual void OnPasteAndGo() = 0;

  // Called when the field's frame changes.
  virtual void OnFrameChanged() = 0;

  // Called when the window containing the field loses focus.
  virtual void OnDidResignKey() = 0;

  // Called when the user begins editing the field, for every edit,
  // and when the user is done editing the field.
  virtual void OnDidBeginEditing() = 0;
  virtual void OnDidChange() = 0;
  virtual void OnDidEndEditing() = 0;

  // NSResponder translates certain keyboard actions into selectors
  // passed to -doCommandBySelector:.  The selector is forwarded here,
  // return true if |cmd| is handled, false if the caller should
  // handle it.
  // TODO(shess): For now, I think having the code which makes these
  // decisions closer to the other autocomplete code is worthwhile,
  // since it calls a wide variety of methods which otherwise aren't
  // clearly relevent to expose here.  But consider pulling more of
  // the AutocompleteEditViewMac calls up to here.
  virtual bool OnDoCommandBySelector(SEL cmd) = 0;
};

@interface AutocompleteTextField : StyledTextField<NSTextViewDelegate,
                                                   URLDropTarget> {
 @private
  // Undo manager for this text field.  We use a specific instance rather than
  // the standard undo manager in order to let us clear the undo stack at will.
  scoped_nsobject<NSUndoManager> undoManager_;

  AutocompleteTextFieldObserver* observer_;  // weak, owned by location bar.

  // Handles being a drag-and-drop target.
  scoped_nsobject<URLDropTargetHandler> dropHandler_;

  // Holds current tooltip strings, to keep them from being dealloced.
  scoped_nsobject<NSMutableArray> currentToolTips_;
}

@property AutocompleteTextFieldObserver* observer;

// Convenience method to return the cell, casted appropriately.
- (AutocompleteTextFieldCell*)autocompleteTextFieldCell;

// Superclass aborts editing before changing the string, which causes
// problems for undo.  This version modifies the field editor's
// contents if the control is already being edited.
- (void)setAttributedStringValue:(NSAttributedString*)aString;

// Clears the undo chain for this text field.
- (void)clearUndoChain;

// Updates cursor and tooltip rects depending on the contents of the text field
// e.g. the security icon should have a default pointer shown on hover instead
// of an I-beam.
- (void)updateCursorAndToolTipRects;

// Return the appropriate menu for any page actions under event.
// Returns nil if no menu is present for the action, or if the event
// is not over an action.
- (NSMenu*)actionMenuForEvent:(NSEvent*)event;

@end

#endif  // CHROME_BROWSER_COCOA_AUTOCOMPLETE_TEXT_FIELD_H_

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