File indexing completed on 2024-12-08 06:39:03

 #include <QKeySequence>
 
 #include "kglobalshortcutinfo_p.h"
 #include "sequencehelpers_p.h"
 
 namespace Utils
 {
 QKeySequence reverseKey(const QKeySequence &key)
 {
     int k[maxSequenceLength] = {0, 0, 0, 0};
     int count = key.count();
     for (int i = 0; i < count; i++) {
         k[count - i - 1] = key[i].toCombined();
     }
 
     return QKeySequence(k[0], k[1], k[2], k[3]);
 }
 
 QKeySequence cropKey(const QKeySequence &key, int count)
 {
     if (count < 1) {
         return key;
     }
 
     // Key is shorter than count we want to cut off
     if (key.count() < count) {
         return QKeySequence();
     }
 
     int k[maxSequenceLength] = {0, 0, 0, 0};
     // cut from beginning
     for (int i = count; i < key.count(); i++) {
         k[i - count] = key[i].toCombined();
     }
 
     return QKeySequence(k[0], k[1], k[2], k[3]);
 }
 
 bool contains(const QKeySequence &key, const QKeySequence &other)
 {
     int minLength = std::min(key.count(), other.count());
 
     // There's an empty key, assume it matches nothing
     if (!minLength) {
         return false;
     }
 
     bool ret = false;
     for (int i = 0; i <= other.count() - minLength; i++) {
         QKeySequence otherCropped = cropKey(other, i);
         if (key.matches(otherCropped) == QKeySequence::PartialMatch || reverseKey(key).matches(reverseKey(otherCropped)) == QKeySequence::PartialMatch) {
             ret = true;
             break;
         }
     }
 
     return ret;
 }
 
 bool matchSequences(const QKeySequence &key, const QList<QKeySequence> &keys)
 {
     // Since we're testing sequences, we need to check for all possible matches
     // between existing and new sequences.
 
     // Let's assume we have (Alt+B, Alt+F, Alt+G) assigned. Examples of bad shortcuts are:
     // 1) Exact matching: (Alt+B, Alt+F, Alt+G)
     // 2) Sequence shadowing: (Alt+B, Alt+F)
     // 3) Sequence being shadowed: (Alt+B, Alt+F, Alt+G, <any key>)
     // 4) Shadowing at the end: (Alt+F, Alt+G)
     // 5) Being shadowed from the end: (<any key>, Alt+B, Alt+F, Alt+G)
 
     for (const QKeySequence &otherKey : keys) {
         if (otherKey.isEmpty()) {
             continue;
         }
         if (key.matches(otherKey) == QKeySequence::ExactMatch || contains(key, otherKey) || contains(otherKey, key)) {
             return true;
         }
     }
     return false;
 }
 
 QKeySequence mangleKey(const QKeySequence &key)
 {
     // Qt triggers both shortcuts that include Shift+Backtab and Shift+Tab
     // when user presses Shift+Tab. Make no difference here.
     int k[maxSequenceLength] = {0, 0, 0, 0};
     for (int i = 0; i < key.count(); i++) {
         // Qt triggers both shortcuts that include Shift+Backtab and Shift+Tab
         // when user presses Shift+Tab. Make no difference here.
         int keySym = key[i].toCombined() & ~Qt::KeyboardModifierMask;
         int keyMod = key[i].toCombined() & Qt::KeyboardModifierMask;
         if ((keyMod & Qt::SHIFT) && (keySym == Qt::Key_Backtab || keySym == Qt::Key_Tab)) {
             k[i] = keyMod | Qt::Key_Tab;
         } else {
             k[i] = key[i].toCombined();
         }
     }
 
     return QKeySequence(k[0], k[1], k[2], k[3]);
 }
 
 } // namespace Utils