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281 lines
8.6 KiB
281 lines
8.6 KiB
/* This file is part of the KDE project
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Copyright (C) 2000 Keunwoo Lee <klee@cs.washington.edu>
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Library General Public License for more details.
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You should have received a copy of the GNU Library General Public License
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along with this library; see the file COPYING.LIB. If not, write to
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the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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Boston, MA 02110-1301, USA.
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*/
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#ifndef KACCELGEN_H
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#define KACCELGEN_H
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#include <tqmap.h>
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#include <tqstring.h>
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#include <tqstringlist.h>
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#include <kdelibs_export.h>
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/**
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* Provides functions that, given a collection of QStrings, will
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* automatically and intelligently assign menu accelerators to the
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* QStrings in the collection.
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*
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* NOTE: When this file speaks of "accelerators", we really mean
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* accelerators as defined by the KDE User Interface Guidelines. We
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* do NOT mean "shortcuts", which are what's handled by most other KDE
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* libraries with "accel" in the name.
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*
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* In the Qt library, the mechanism for adding a keyboard accelerator
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* to a menu item is to insert an '&' before the letter. Since we
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* usually don't want to disturb the original collection, the idiom in
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* these functions is to populate a "target" TQStringList parameter
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* with the input collectin's QStrings, plus possibly some added '&'
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* characters.
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*
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* That is the mechanism. Here is the policy, in order of decreasing
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* importance (it may seem like these are implementation details, but
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* IMHO the policy is an important part of the interface):
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*
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* 1. If the string already contains an '&' character, skip this
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* string, because we consider such strings to be "user-specified"
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* accelerators.
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*
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* 2. No accelerator may clash with a previously defined accelerator,
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* including any legal (alphanumeric) user-specified accelerator
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* anywhere in the collection
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*
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* 3. Prefer alphanumerics at the start of the string.
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*
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* 4. Otherwise, prefer alphanumerics at the start of a word.
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*
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* 5. Otherwise, choose any alphanumeric character not already
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* taken. If no such character is available, give up & skip this
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* string.
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*
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* A typical use of these functions would be to automatically assign
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* accelerators to a dynamically populated popup menu. For example,
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* the core code was written to automatically set accelerators for the
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* "Load View Profile" popup menu for Konqueror. We quickly realized
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* that it would be useful to make this facility more generally
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* available, so I abstracted it out into a set of templates.
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*
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* TODO:
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*
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* + Add sugar functions for more collections.
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*
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* + Add more Deref classes so that we can access a wider variety of
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* collections.
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* */
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namespace KAccelGen
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{
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// HELPERS
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/**
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* Static dereference class, for use as a template parameter.
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*/
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template <class Iter>
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class Deref
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{
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public:
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static TQString deref(Iter i) { return *i; }
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};
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/**
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* Static dereference class that calls the key() method on its
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* target; for use as a template parameter.
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*/
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template <class Iter>
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class Deref_Key
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{
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public:
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static TQString deref(Iter i) { return i.key(); }
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};
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/**
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* Helper to determine if the given offset in the string could be a
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* legal alphanumeric accelerator.
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*
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* @param str base string
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* @param index offset to check
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*/
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inline bool
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isLegalAccelerator(const TQString& str, uint index)
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{
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return index < str.length()
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&& str[index].isLetterOrNumber();
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}
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/**
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* Loads all legal predefined accelerators in the (implicitly
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* specified) collection into the given TQMap.
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*
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* @param begin start iterator
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* @param end (last+1) iterator
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* @param keys map to store output
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*/
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template <class Iter, class Deref>
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inline void
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loadPredefined(Iter begin, Iter end, TQMap<TQChar,bool>& keys)
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{
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for (Iter i = begin; i != end; ++i) {
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TQString item = Deref::deref(i);
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int user_ampersand = item.tqfind(TQChar('&'));
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if( user_ampersand >= 0 ) {
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// Sanity check. Note that we don't try to find an
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// accelerator if the user shoots him/herself in the foot
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// by adding a bad '&'.
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if( isLegalAccelerator(item, user_ampersand+1) ) {
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keys.insert(item[user_ampersand+1], true);
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}
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}
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}
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}
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// ///////////////////////////////////////////////////////////////////
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// MAIN USER FUNCTIONS
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/**
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* Main, maximally flexible template function that assigns
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* accelerators to the elements of a collection of QStrings. Clients
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* will seldom use this directly, as it's usually easier to use one of
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* the wrapper functions that simply takes a collection (see below).
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*
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* The Deref template parameter is a class containing a static
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* dereferencing function, modeled after the comparison class C in
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* Stroustrup 13.4.
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*
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* @param begin (you know)
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* @param end (you know)
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* @param target collection to store generated strings
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*/
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template <class Iter, class Iter_Deref >
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void
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generate(Iter begin, Iter end, TQStringList& target)
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{
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// Will keep track of used accelerator chars
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TQMap<TQChar,bool> used_accels;
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// Prepass to detect manually user-coded accelerators
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loadPredefined<Iter,Iter_Deref>(begin, end, used_accels);
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// Main pass
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for (Iter i = begin; i != end; ++i) {
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TQString item = Iter_Deref::deref(i);
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// Attempt to find a good accelerator, but only if the user
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// has not manually hardcoded one.
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int user_ampersand = item.tqfind(TQChar('&'));
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if( user_ampersand < 0 || item[user_ampersand+1] == '&') {
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bool found = false;
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uint found_idx;
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uint j;
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// Check word-starting letters first.
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for( j=0; j < item.length(); ++j ) {
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if( isLegalAccelerator(item, j)
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&& !used_accels.tqcontains(item[j])
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&& (0 == j || (j > 0 && item[j-1].isSpace())) ) {
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found = true;
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found_idx = j;
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break;
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}
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}
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if( !found ) {
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// No word-starting letter; search for any letter.
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for( j=0; j < item.length(); ++j ) {
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if( isLegalAccelerator(item, j)
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&& !used_accels.tqcontains(item[j]) ) {
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found = true;
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found_idx = j;
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break;
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}
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}
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}
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if( found ) {
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// Both upper and lower case marked as used
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used_accels.insert(item[j].upper(),true);
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used_accels.insert(item[j].lower(),true);
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item.insert(j,TQChar('&'));
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}
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}
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target.append( item );
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}
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}
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/**
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* Another convenience function; looks up the key instead of
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* dereferencing directly for the given iterator.
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*
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* @param begin
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* @param end
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* @param target
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*/
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template <class Iter>
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inline void
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generateFromKeys(Iter begin, Iter end, TQStringList& target)
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{
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generate< Iter, Deref_Key<Iter> >(begin, end, target);
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}
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/**
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* Convenience function; generates accelerators for all the items in
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* a TQStringList.
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*
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* @param source Strings for which to generate accelerators
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* @param target Output for accelerator-added strings */
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inline void
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generate(const TQStringList& source, TQStringList& target)
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{
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generate<TQStringList::ConstIterator, Deref<TQStringList::ConstIterator> >(source.begin(), source.end(), target);
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}
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/**
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* Convenience function; generates accelerators for all the values in
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* a TQMap<T,TQString>.
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*
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* @param source Map with input strings as VALUES.
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* @param target Output for accelerator-added strings */
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template <class Key>
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inline void
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generateFromValues(const TQMap<Key,TQString>& source, TQStringList& target)
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{
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generate<TQMapConstIterator<Key,TQString>, Deref_Key<TQMapConstIterator<Key,TQString> > >(source.begin(), source.end(), target);
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}
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/**
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* Convenience function; generates an accelerator mapping from all the
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* keys in a TQMap<TQString,T>
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*
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* @param source Map with input strings as KEYS.
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* @param target Output for accelerator-added strings */
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template <class Data>
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inline void
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generateFromKeys(const TQMap<TQString,Data>& source, TQStringList& target)
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{
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generateFromKeys(source.begin(), source.end(), target);
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}
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} // end namespace KAccelGen
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#endif
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