File indexing completed on 2024-06-16 05:01:27

 /* Copyright (C) 2009, 2011, 2013 by Glad Deschrijver <glad.deschrijver@gmail.com>
    Copyright (C) 2013 Thomas Lübking <thomas.luebking@gmail.com>
    Copyright (C) 2006 - 2015 Jan Kundrát <jkt@kde.org>
 
    This file is part of the Trojita Qt IMAP e-mail client,
    http://trojita.flaska.net/
 
    This program is free software; you can redistribute it and/or
    modify it under the terms of the GNU General Public License as
    published by the Free Software Foundation; either version 2 of
    the License or (at your option) version 3 or any later version
    accepted by the membership of KDE e.V. (or its successor approved
    by the membership of KDE e.V.), which shall act as a proxy
    defined in Section 14 of version 3 of the license.
 
    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.
 
    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
 #include <QAbstractItemView>
 #include <QCompleter>
 #include <QKeyEvent>
 #include "Common/InvokeMethod.h"
 #include "Gui/LineEdit.h"
 #include "UiUtils/IconLoader.h"
 
 LineEdit::LineEdit(const QString &text, QWidget *parent)
     : QLineEdit(text, parent), m_historyEnabled(false), m_historyPosition(0)
 {
     setClearButtonEnabled(true);
     connect(this, &QLineEdit::editingFinished, this, [this](){
         emit textEditingFinished(this->text());
     });
 }
 
 LineEdit::LineEdit(QWidget *parent)
     : LineEdit(QString(), parent)
 {
 }
 
 bool LineEdit::isHistoryEnabled()
 {
     return m_historyEnabled;
 }
 
 void LineEdit::setHistoryEnabled(bool enabled)
 {
     if (enabled == m_historyEnabled)
         return;
     m_historyEnabled = enabled;
     if (m_historyEnabled) {
         // queued so we learn and update the history list *after* the user selected an item from popup
         connect(this, &QLineEdit::returnPressed, this, &LineEdit::learnEntry, Qt::QueuedConnection);
         QCompleter *completer = new QCompleter(QStringList(), this);
         completer->setCaseSensitivity(Qt::CaseInsensitive);
         completer->setCompletionMode(QCompleter::InlineCompletion);
         setCompleter(completer);
     } else {
         disconnect(this, &QLineEdit::returnPressed, this, &LineEdit::learnEntry);
         delete completer();
         setCompleter(nullptr);
     }
 }
 
 bool LineEdit::eventFilter(QObject *o, QEvent *e)
 {
     if (e->type() == QEvent::Hide && o == completer()->popup()) {
         // next event cycle, the popup is deleted by the change and "return true" does not help
         // connect queued to not manipulate the history *during* selection from popup, but *after*
         CALL_LATER_NOARG(this, restoreInlineCompletion);
     }
     return false;
 }
 
 void LineEdit::keyReleaseEvent(QKeyEvent *ke)
 {
     if (ke->key() == Qt::Key_Escape) {
         QLineEdit::keyReleaseEvent(ke);
         emit escapePressed();
         return;
     }
 
     if (!m_historyEnabled || completer()->completionMode() == QCompleter::UnfilteredPopupCompletion ||
         !(ke->key() == Qt::Key_Up || ke->key() == Qt::Key_Down)) {
         // irrelevant events -> ignore
         QLineEdit::keyReleaseEvent(ke);
         return;
     }
 
     // this manages the shell-a-like history and
     // triggers a popdown (when pressing "down" arrow from current entry)
 
     QAbstractItemModel *m = completer()->model();
     int historyCount = m->rowCount();
 
     if (ke->key() == Qt::Key_Up) {
         // shell-a-like history navigation
         if (m_historyPosition == historyCount) {
             m_currentText = text();
             if (historyCount && m->index(m_historyPosition - 1,0).data().toString() == m_currentText) {
                 // user still sees entry he entered (into history) last - skip that one.
                 --m_historyPosition;
             }
         }
         if (--m_historyPosition < 0) {
             m_historyPosition = historyCount;
             setText(m_currentText);
         } else {
             setText(m->index(m_historyPosition,0).data().toString());
         }
     } else if (ke->key() == Qt::Key_Down) {
         if (m_historyPosition + 1 < historyCount && m->index(m_historyPosition + 1,0).data().toString() == m_currentText) {
             // user still sees entry he entered (into history) last - skip that one.
             ++m_historyPosition;
         }
         if (++m_historyPosition == historyCount) {
             // returning from shell-a-like journey
             setText(m_currentText);
         } else if (m_historyPosition > historyCount) {
             // trigger pop...down ;-)
             completer()->setCompletionMode(QCompleter::UnfilteredPopupCompletion);
             completer()->complete(); // make a popup
             completer()->popup()->removeEventFilter(this); // protected against accidental double filtering
             completer()->popup()->installEventFilter(this); // to restore inline completion when it closes
             m_historyPosition = historyCount; // fix value to "current" (it's usually historyCount + 1 now)
         } else {
             // shell-a-like history navigation
             setText(m->index(m_historyPosition,0).data().toString());
         }
     }
     QLineEdit::keyReleaseEvent(ke);
 }
 
 void LineEdit::learnEntry()
 {
     QAbstractItemModel *m = completer()->model();
     int rows = m->rowCount();
     for (int i = 0; i < rows; ++i) {
         if (m->index(i,0).data() == text()) {
             m->removeRow(i);
             --rows;
             break;
         }
     }
     m->insertRows(rows, 1);
     m->setData(m->index(rows, 0), text(), Qt::DisplayRole);
     m_historyPosition = rows + 1;
 }
 
 void LineEdit::restoreInlineCompletion()
 {
     m_currentText = text(); // this was probably just updated by seleting from combobox
     completer()->setCompletionMode(QCompleter::InlineCompletion);
     CALL_LATER_NOARG(this, setFocus); // can't get in the second event cycle either
 }