chrome/browser/ui/cocoa/location_bar/autocomplete_text_field.h

   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 #ifndef CHROME_BROWSER_UI_COCOA_AUTOCOMPLETE_TEXT_FIELD_H_
   6 #define CHROME_BROWSER_UI_COCOA_AUTOCOMPLETE_TEXT_FIELD_H_
   7
   8 #import <Cocoa/Cocoa.h>
   9
  10 #include "base/mac/scoped_nsobject.h"
  11 #import "chrome/browser/ui/cocoa/styled_text_field.h"
  12 #import "chrome/browser/ui/cocoa/url_drop_target.h"
  13
  14 @class AutocompleteTextFieldCell;
  15
  16 // AutocompleteTextField intercepts UI actions for forwarding to
  17 // OmniboxViewMac (*), and provides a custom look.  It works
  18 // together with AutocompleteTextFieldEditor (mostly for intercepting
  19 // user actions) and AutocompleteTextFieldCell (mostly for custom
  20 // drawing).
  21 //
  22 // For historical reasons, chrome/browser/autocomplete is the core
  23 // implementation of the Omnibox.  Chrome code seems to vary between
  24 // autocomplete and Omnibox in describing this.
  25 //
  26 // (*) OmniboxViewMac is a view in the MVC sense for the
  27 // Chrome internals, though it's really more of a mish-mash of model,
  28 // view, and controller.
  29
  30 // Provides a hook so that we can call directly down to
  31 // OmniboxViewMac rather than traversing the delegate chain.
  32 class AutocompleteTextFieldObserver {
  33  public:
  34   // Called before changing the selected range of the field.
  35   virtual NSRange SelectionRangeForProposedRange(NSRange proposed_range) = 0;
  36
  37   // Called when the control-key state changes while the field is
  38   // first responder.
  39   virtual void OnControlKeyChanged(bool pressed) = 0;
  40
  41   // Called when the user pastes into the field.
  42   virtual void OnPaste() = 0;
  43
  44   // Return |true| if there is a selection to copy.
  45   virtual bool CanCopy() = 0;
  46
  47   // Clears the |pboard| and adds the field's current selection.
  48   // Called when the user does a copy or drag.
  49   virtual void CopyToPasteboard(NSPasteboard* pboard) = 0;
  50
  51   // Returns true if the Show URL option should be available.
  52   virtual bool ShouldEnableShowURL() = 0;
  53
  54   // Shows the underlying URL.  See OmniboxView::ShowURL().
  55   virtual void ShowURL() = 0;
  56
  57   // Returns true if the current clipboard text supports paste and go
  58   // (or paste and search).
  59   virtual bool CanPasteAndGo() = 0;
  60
  61   // Returns the appropriate "Paste and Go" or "Paste and Search"
  62   // context menu string, depending on what is currently in the
  63   // clipboard.  Must not be called unless CanPasteAndGo() returns
  64   // true.
  65   virtual int GetPasteActionStringId() = 0;
  66
  67   // Called when the user initiates a "paste and go" or "paste and
  68   // search" into the field.
  69   virtual void OnPasteAndGo() = 0;
  70
  71   // Called when the field's frame changes.
  72   virtual void OnFrameChanged() = 0;
  73
  74   // Called when the popup is no longer appropriate, such as when the
  75   // field's window loses focus or a page action is clicked.
  76   virtual void ClosePopup() = 0;
  77
  78   // Called when the user begins editing the field, for every edit,
  79   // and when the user is done editing the field.
  80   virtual void OnDidBeginEditing() = 0;
  81   virtual void OnBeforeChange() = 0;
  82   virtual void OnDidChange() = 0;
  83   virtual void OnDidEndEditing() = 0;
  84
  85   // NSResponder translates certain keyboard actions into selectors
  86   // passed to -doCommandBySelector:.  The selector is forwarded here,
  87   // return true if |cmd| is handled, false if the caller should
  88   // handle it.
  89   // TODO(shess): For now, I think having the code which makes these
  90   // decisions closer to the other autocomplete code is worthwhile,
  91   // since it calls a wide variety of methods which otherwise aren't
  92   // clearly relevent to expose here.  But consider pulling more of
  93   // the OmniboxViewMac calls up to here.
  94   virtual bool OnDoCommandBySelector(SEL cmd) = 0;
  95
  96   // Called whenever the autocomplete text field gets focused.
  97   virtual void OnSetFocus(bool control_down) = 0;
  98
  99   // Called whenever the autocomplete text field is losing focus.
 100   virtual void OnKillFocus() = 0;
 101
 102   // Called before the text field handles a mouse down event.
 103   virtual void OnMouseDown(NSInteger button_number) = 0;
 104
 105   // Returns true if mouse down should select all.
 106   virtual bool ShouldSelectAllOnMouseDown() = 0;
 107
 108  protected:
 109   virtual ~AutocompleteTextFieldObserver() {}
 110 };
 111
 112 @interface AutocompleteTextField : StyledTextField<NSTextViewDelegate,
 113                                                    URLDropTarget> {
 114  @private
 115   // Undo manager for this text field.  We use a specific instance rather than
 116   // the standard undo manager in order to let us clear the undo stack at will.
 117   base::scoped_nsobject<NSUndoManager> undoManager_;
 118
 119   AutocompleteTextFieldObserver* observer_;  // weak, owned by location bar.
 120
 121   // Handles being a drag-and-drop target.
 122   base::scoped_nsobject<URLDropTargetHandler> dropHandler_;
 123
 124   // Holds current tooltip strings, to keep them from being dealloced.
 125   base::scoped_nsobject<NSMutableArray> currentToolTips_;
 126
 127   base::scoped_nsobject<NSString> suggestText_;
 128   base::scoped_nsobject<NSColor> suggestColor_;
 129 }
 130
 131 @property(nonatomic) AutocompleteTextFieldObserver* observer;
 132
 133 // Convenience method to return the cell, casted appropriately.
 134 - (AutocompleteTextFieldCell*)cell;
 135
 136 // Superclass aborts editing before changing the string, which causes
 137 // problems for undo.  This version modifies the field editor's
 138 // contents if the control is already being edited.
 139 - (void)setAttributedStringValue:(NSAttributedString*)aString;
 140
 141 // Clears the undo chain for this text field.
 142 - (void)clearUndoChain;
 143
 144 // Updates cursor and tooltip rects depending on the contents of the text field
 145 // e.g. the security icon should have a default pointer shown on hover instead
 146 // of an I-beam.
 147 - (void)updateMouseTracking;
 148
 149 // Return the appropriate menu for any decoration under |event|.
 150 - (NSMenu*)decorationMenuForEvent:(NSEvent*)event;
 151
 152 // Retains |tooltip| (in |currentToolTips_|) and adds this tooltip
 153 // via -[NSView addToolTipRect:owner:userData:].
 154 - (void)addToolTip:(NSString*)tooltip forRect:(NSRect)aRect;
 155
 156 // Sets the suggest text that shows at the end of the field's normal text.
 157 // This can't be simply appended to the field's text storage because that
 158 // will end any pending IME session.
 159 - (void)setGrayTextAutocompletion:(NSString*)suggestText
 160                         textColor:(NSColor*)suggestColor;
 161
 162 - (NSString*)suggestText;
 163 - (NSColor*)suggestColor;
 164
 165 @end
 166
 167 namespace autocomplete_text_field {
 168
 169 // Draw gray text suggestion in |controlView|.
 170 void DrawGrayTextAutocompletion(NSAttributedString* mainText,
 171                                 NSString* suggestText,
 172                                 NSColor* suggestColor,
 173                                 NSView* controlView,
 174                                 NSRect frame);
 175
 176 }  // namespace autocomplete_text_field
 177
 178 #endif  // CHROME_BROWSER_UI_COCOA_AUTOCOMPLETE_TEXT_FIELD_H_