mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-11-05 08:35:26 +00:00
267 lines
8.8 KiB
C++
267 lines
8.8 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
|
|
*
|
|
* The contents of this file are subject to the Netscape Public
|
|
* License Version 1.1 (the "License"); you may not use this file
|
|
* except in compliance with the License. You may obtain a copy of
|
|
* the License at http://www.mozilla.org/NPL/
|
|
*
|
|
* Software distributed under the License is distributed on an "AS
|
|
* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
|
|
* implied. See the License for the specific language governing
|
|
* rights and limitations under the License.
|
|
*
|
|
* The Original Code is mozilla.org code.
|
|
*
|
|
* The Initial Developer of the Original Code is Netscape
|
|
* Communications Corporation. Portions created by Netscape are
|
|
* Copyright (C) 1998 Netscape Communications Corporation. All
|
|
* Rights Reserved.
|
|
*
|
|
* Contributor(s):
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include "opaque_ptr.h"
|
|
#include "own_ptr.h"
|
|
#include "cached.h"
|
|
#include <list.h>
|
|
#include <algo.h>
|
|
|
|
/*
|
|
Note:
|
|
some warnings are generated because a list of items that have |own_ptr| members doesn't like
|
|
the template constructor that builds from a const reference to another such list. I'll try to
|
|
do the right thing soon... one can't construct an |own_ptr| from a |const own_ptr&| since the
|
|
source object must yield ownership, this changing state.
|
|
*/
|
|
|
|
#pragma mark -- class CSelector --
|
|
|
|
|
|
/*
|
|
CSelector
|
|
|
|
A pane displaying a list of `selectors' (icons w/labels).
|
|
|
|
With this API, at most one selector can be `active', i.e., the currently selected one. If we decide to implement
|
|
multiple selection, then the right thing to do might be: rethink `active' or `selected' as `should be shown', and
|
|
put a |bool| to that effect in the |Selector| struct.
|
|
|
|
Whenever the active selector changes, we |BroadcastMessage(msg_ActiveSelectorChanged, this)|.
|
|
Clients then use something like |static_cast<const CNavCenterSelectorPane*>(ioParam)->active_selector()|
|
|
to get the new active selector.
|
|
|
|
To reduce the volume of code and APIs, clients can ask for the underlying list of selectors displayed by the pane,
|
|
and make changes directly to that list. Right now they get an actual reference to the list. I want to change that
|
|
to some kind of `ticket' that acts like a reference to the list, but automatically notifies the pane that the
|
|
list has changed when the ticket is destucted. In the mean time, after a client has modified the list, but before
|
|
they have called |notice_selectors_changed()|, the pane will not acurately reflect the contents of the list, and
|
|
the results of |active_selector(void)| are not necessarily valid. See below.
|
|
|
|
This class knows nothing about PowerPlant or the macFE. It could be (and maybe should be)
|
|
XP code if we so desired.
|
|
*/
|
|
|
|
template<class T>
|
|
class CSelector
|
|
{
|
|
public:
|
|
|
|
// bitfield constants for the image mode
|
|
enum {
|
|
kSelected = 1, kIcon = 2, kText = 4
|
|
};
|
|
|
|
typedef list<T> SelectorList;
|
|
typedef SelectorList::iterator iterator;
|
|
typedef SelectorList::const_iterator const_iterator;
|
|
|
|
|
|
class equals_selector
|
|
// ...a predicate for finding a particular selector, given an |opaque_ptr<Selector>|.
|
|
{
|
|
public:
|
|
explicit
|
|
equals_selector( opaque_ptr<T> ptr_to_desired_selector )
|
|
: _ptr_to_desired_selector(ptr_to_desired_selector)
|
|
{
|
|
// nothing else to do
|
|
}
|
|
|
|
bool
|
|
operator()( const T& selector )
|
|
{
|
|
return opaque_ptr<T>(&selector) == _ptr_to_desired_selector;
|
|
}
|
|
|
|
private:
|
|
opaque_ptr<T> _ptr_to_desired_selector;
|
|
};
|
|
|
|
|
|
// constructor and destructor
|
|
CSelector ( unsigned long inImageMode, size_t inCellHeight )
|
|
: _image_mode(inImageMode), _cell_height(inCellHeight) { };
|
|
virtual ~CSelector ( ) { };
|
|
|
|
|
|
const SelectorList&
|
|
selectors() const
|
|
// Return the list of |Selector|s for clients to _examine_.
|
|
{
|
|
return _selector_list;
|
|
}
|
|
|
|
SelectorList&
|
|
selectors()
|
|
// Return the list of |Selector|s for clients to _modify_. Clients must call |notice_selectors_changed()| if they do.
|
|
{
|
|
return _selector_list;
|
|
}
|
|
|
|
virtual void notice_selectors_changed();
|
|
// Clients call after modifying the list of |Selector|s. Among other things, the page will |Refresh()|.
|
|
|
|
/*
|
|
Note: |notice_selectors_changed()| will notice if the active selector has been removed from the list
|
|
and will broadcast that the selector has changed, i.e., you are saying `currently, no selector is active'.
|
|
If you were about to activate a new selector, then you should call |active_selector(iter)| _before_
|
|
calling |notice_selectors_changed()| to minimize the number of broadcasts.
|
|
*/
|
|
|
|
iterator find_active_selector();
|
|
// Return (an |iterator| pointing to) the active selector, or |selectors().end()| if no selector is active.
|
|
|
|
const_iterator find_active_selector() const
|
|
// Return (a |const_iterator| pointing to) the active selector, or |selectors().end()| if no selector is active.
|
|
{
|
|
return const_cast<CSelector*>(this)->find_active_selector();
|
|
}
|
|
|
|
iterator active_selector()
|
|
/*
|
|
Return (an |iterator| pointing to) the active selector, or |selectors().end()| if no selector is active.
|
|
The result may dangle if |notice_selectors_changed()| is pending (i.e., hasn't yet been called, though it needs to).
|
|
*/
|
|
{
|
|
if ( !_cached_active_selector.is_valid() )
|
|
_cached_active_selector = find_active_selector();
|
|
return _cached_active_selector;
|
|
}
|
|
|
|
const_iterator active_selector() const
|
|
/*
|
|
Return (a |const_iterator| pointing to) the active selector, or |selectors().end()| if no selector is active.
|
|
The result may dangle if |notice_selectors_changed()| is pending (i.e., hasn't yet been called, though it needs to).
|
|
*/
|
|
{
|
|
return const_cast<CSelector*>(this)->active_selector();
|
|
}
|
|
|
|
/*
|
|
The difference between |find_active_selector()| and |active_selector()| is that the latter may be faster,
|
|
but could return a dangling iterator if a client has erased the currently active selector from the
|
|
selector list (possibly as part of a larger change) and not yet called |notice_selectors_changed()|.
|
|
There are no guarantees for |active_selector()| while |notice_selectors_changed()| is pending (i.e., hasn't
|
|
yet been called, though a client has modified the list).
|
|
|
|
Both return an iterator equal to |selectors().end()| if there is no currently active selector (not guaranteed
|
|
in the case where |active_selector()| returns a dangling iterator).
|
|
|
|
The mnemonic for the difference is that |find_active_selector| actually has to go out and find it, while
|
|
|active_selector| can simply return a value.
|
|
*/
|
|
|
|
void active_selector( const_iterator iter );
|
|
// Make |*iter| the active |Selector|, and if that's a change then broadcast |msg_ActiveSelectorChanged| and |Refresh()| the pane.
|
|
|
|
virtual const_iterator find_selector_for_point ( const Point & inMouseLoc ) const ;
|
|
virtual size_t find_index_for_point ( const Point & inMouseLoc ) const ;
|
|
|
|
protected:
|
|
|
|
virtual void notice_active_selector_changed ( const_iterator inOldSelector );
|
|
|
|
// override to actually make use of a broadcaster implementation
|
|
virtual void broadcast_active_selector_changed ( ) = 0;
|
|
|
|
SelectorList _selector_list;
|
|
opaque_ptr<T> _active_selector;
|
|
cached<iterator> _cached_active_selector;
|
|
|
|
unsigned long _image_mode;
|
|
size_t _cell_height;
|
|
|
|
}; // class CSelector
|
|
|
|
|
|
#pragma mark -- IMPLEMENTATION --
|
|
|
|
|
|
template <class T>
|
|
void
|
|
CSelector<T>::notice_selectors_changed()
|
|
{
|
|
// Check that the active selector wasn't removed from this list...
|
|
const_iterator new_active_selector = find_active_selector();
|
|
if ( new_active_selector != _active_selector )
|
|
active_selector(new_active_selector); // ...it was! We'd better tell everybody, there is no active selection.
|
|
}
|
|
|
|
template <class T>
|
|
CSelector<T>::iterator
|
|
CSelector<T>::find_active_selector()
|
|
{
|
|
return find_if(selectors().begin(), selectors().end(), equals_selector(_active_selector));
|
|
}
|
|
|
|
|
|
template <class T>
|
|
void
|
|
CSelector<T>::active_selector( const_iterator iter )
|
|
{
|
|
const_iterator old_selector = active_selector(); // save old one
|
|
_active_selector = opaque_ptr<T>(&(*iter));
|
|
notice_active_selector_changed(old_selector);
|
|
}
|
|
|
|
|
|
template <class T>
|
|
void
|
|
CSelector<T>::notice_active_selector_changed ( const_iterator /*inNewSelector*/ )
|
|
{
|
|
_cached_active_selector.invalidate();
|
|
broadcast_active_selector_changed ( );
|
|
}
|
|
|
|
|
|
template <class T>
|
|
size_t
|
|
CSelector<T> :: find_index_for_point ( const Point & inMouseLoc ) const
|
|
{
|
|
return inMouseLoc.v / _cell_height;
|
|
}
|
|
|
|
|
|
//
|
|
// find_selector_for_point
|
|
//
|
|
// Given a point in image coordinates, return which selector the mouse
|
|
// is over.
|
|
//
|
|
template <class T>
|
|
CSelector<T>::const_iterator
|
|
CSelector<T> :: find_selector_for_point ( const Point & inMouseLoc ) const
|
|
{
|
|
size_t cell_index = find_index_for_point ( inMouseLoc );
|
|
if ( cell_index > selectors().size() )
|
|
return selectors().end();
|
|
|
|
const_iterator iter = selectors().begin();
|
|
advance ( iter, cell_index );
|
|
|
|
return iter;
|
|
|
|
} // find_selector_for_point
|