qt 6.5.1 original

examples/widgets/tools/customcompleter/textedit.cpp

@@ -0,0 +1,137 @@
+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#include "textedit.h"
+#include <QCompleter>
+#include <QKeyEvent>
+#include <QAbstractItemView>
+#include <QtDebug>
+#include <QApplication>
+#include <QModelIndex>
+#include <QAbstractItemModel>
+#include <QScrollBar>
+
+//! [0]
+TextEdit::TextEdit(QWidget *parent)
+    : QTextEdit(parent)
+{
+    setPlainText(tr("This TextEdit provides autocompletions for words that have more than"
+                    " 3 characters. You can trigger autocompletion using ") +
+                    QKeySequence("Ctrl+E").toString(QKeySequence::NativeText));
+}
+//! [0]
+
+//! [1]
+TextEdit::~TextEdit()
+{
+}
+//! [1]
+
+//! [2]
+void TextEdit::setCompleter(QCompleter *completer)
+{
+    if (c)
+        c->disconnect(this);
+
+    c = completer;
+
+    if (!c)
+        return;
+
+    c->setWidget(this);
+    c->setCompletionMode(QCompleter::PopupCompletion);
+    c->setCaseSensitivity(Qt::CaseInsensitive);
+    QObject::connect(c, QOverload<const QString &>::of(&QCompleter::activated),
+                     this, &TextEdit::insertCompletion);
+}
+//! [2]
+
+//! [3]
+QCompleter *TextEdit::completer() const
+{
+    return c;
+}
+//! [3]
+
+//! [4]
+void TextEdit::insertCompletion(const QString &completion)
+{
+    if (c->widget() != this)
+        return;
+    QTextCursor tc = textCursor();
+    int extra = completion.length() - c->completionPrefix().length();
+    tc.movePosition(QTextCursor::Left);
+    tc.movePosition(QTextCursor::EndOfWord);
+    tc.insertText(completion.right(extra));
+    setTextCursor(tc);
+}
+//! [4]
+
+//! [5]
+QString TextEdit::textUnderCursor() const
+{
+    QTextCursor tc = textCursor();
+    tc.select(QTextCursor::WordUnderCursor);
+    return tc.selectedText();
+}
+//! [5]
+
+//! [6]
+void TextEdit::focusInEvent(QFocusEvent *e)
+{
+    if (c)
+        c->setWidget(this);
+    QTextEdit::focusInEvent(e);
+}
+//! [6]
+
+//! [7]
+void TextEdit::keyPressEvent(QKeyEvent *e)
+{
+    if (c && c->popup()->isVisible()) {
+        // The following keys are forwarded by the completer to the widget
+       switch (e->key()) {
+       case Qt::Key_Enter:
+       case Qt::Key_Return:
+       case Qt::Key_Escape:
+       case Qt::Key_Tab:
+       case Qt::Key_Backtab:
+            e->ignore();
+            return; // let the completer do default behavior
+       default:
+           break;
+       }
+    }
+
+    const bool isShortcut = (e->modifiers().testFlag(Qt::ControlModifier) && e->key() == Qt::Key_E); // CTRL+E
+    if (!c || !isShortcut) // do not process the shortcut when we have a completer
+        QTextEdit::keyPressEvent(e);
+//! [7]
+
+//! [8]
+    const bool ctrlOrShift = e->modifiers().testFlag(Qt::ControlModifier) ||
+                             e->modifiers().testFlag(Qt::ShiftModifier);
+    if (!c || (ctrlOrShift && e->text().isEmpty()))
+        return;
+
+    static QString eow("~!@#$%^&*()_+{}|:\"<>?,./;'[]\\-="); // end of word
+    const bool hasModifier = (e->modifiers() != Qt::NoModifier) && !ctrlOrShift;
+    QString completionPrefix = textUnderCursor();
+
+    if (!isShortcut && (hasModifier || e->text().isEmpty()|| completionPrefix.length() < 3
+                      || eow.contains(e->text().right(1)))) {
+        c->popup()->hide();
+        return;
+    }
+
+    if (completionPrefix != c->completionPrefix()) {
+        c->setCompletionPrefix(completionPrefix);
+        c->popup()->setCurrentIndex(c->completionModel()->index(0, 0));
+    }
+    QRect cr = cursorRect();
+    cr.setWidth(c->popup()->sizeHintForColumn(0)
+                + c->popup()->verticalScrollBar()->sizeHint().width());
+    c->complete(cr); // popup it up!
+}
+//! [8]
+