improve ui

qv2ray/v2/ui/QvAutoCompleteTextEdit.cpp

@@ -0,0 +1,167 @@
+/****************************************************************************
+**
+** Copyright (C) 2016 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the examples of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:BSD$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** BSD License Usage
+** Alternatively, you may use this file under the terms of the BSD license
+** as follows:
+**
+** "Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are
+** met:
+**   * Redistributions of source code must retain the above copyright
+**     notice, this list of conditions and the following disclaimer.
+**   * Redistributions in binary form must reproduce the above copyright
+**     notice, this list of conditions and the following disclaimer in
+**     the documentation and/or other materials provided with the
+**     distribution.
+**   * Neither the name of The Qt Company Ltd nor the names of its
+**     contributors may be used to endorse or promote products derived
+**     from this software without specific prior written permission.
+**
+**
+** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "QvAutoCompleteTextEdit.hpp"
+
+#include <QAbstractItemModel>
+#include <QAbstractItemView>
+#include <QApplication>
+#include <QCompleter>
+#include <QKeyEvent>
+#include <QModelIndex>
+#include <QScrollBar>
+#include <QStringListModel>
+#include <QToolTip>
+#include <QtDebug>
+
+namespace Qv2ray::ui::widgets
+{
+    AutoCompleteTextEdit::AutoCompleteTextEdit(const QString &prefix, const QStringList &sourceStrings, QWidget *parent) : QPlainTextEdit(parent)
+    {
+        this->prefix = prefix;
+        this->setLineWrapMode(QPlainTextEdit::NoWrap);
+        c = new QCompleter(this);
+        c->setModel(new QStringListModel(sourceStrings, c));
+        c->setWidget(this);
+        c->setCompletionMode(QCompleter::PopupCompletion);
+        c->setCaseSensitivity(Qt::CaseInsensitive);
+        QObject::connect(c, QOverload<const QString &>::of(&QCompleter::activated), this, &AutoCompleteTextEdit::insertCompletion);
+    }
+
+    AutoCompleteTextEdit::~AutoCompleteTextEdit()
+    {
+    }
+
+    void AutoCompleteTextEdit::insertCompletion(const QString &completion)
+    {
+        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);
+    }
+
+    QString AutoCompleteTextEdit::lineUnderCursor() const
+    {
+        QTextCursor tc = textCursor();
+        tc.select(QTextCursor::LineUnderCursor);
+        return tc.selectedText();
+    }
+
+    QString AutoCompleteTextEdit::wordUnderCursor() const
+    {
+        QTextCursor tc = textCursor();
+        tc.select(QTextCursor::WordUnderCursor);
+        return tc.selectedText();
+    }
+
+    void AutoCompleteTextEdit::focusInEvent(QFocusEvent *e)
+    {
+        if (c)
+            c->setWidget(this);
+
+        QPlainTextEdit::focusInEvent(e);
+    }
+
+    void AutoCompleteTextEdit::keyPressEvent(QKeyEvent *e)
+    {
+        const bool hasCtrlOrShiftModifier = e->modifiers().testFlag(Qt::ControlModifier) || e->modifiers().testFlag(Qt::ShiftModifier);
+        const bool hasOtherModifiers = (e->modifiers() != Qt::NoModifier) && !hasCtrlOrShiftModifier; // has other modifiers
+        //
+        const bool isSpace = (e->modifiers().testFlag(Qt::ShiftModifier) || e->modifiers().testFlag(Qt::NoModifier)) //
+                             && e->key() == Qt::Key_Space;
+        const bool isTab = (e->modifiers().testFlag(Qt::NoModifier) && e->key() == Qt::Key_Tab);
+        const bool isOtherSpace = e->text() == "　";
+        //
+        if (isSpace || isTab || isOtherSpace)
+        {
+            QToolTip::showText(this->mapToGlobal(QPoint(0, 0)), tr("You can not input space characters here."), this, QRect{}, 2000);
+            return;
+        }
+        //
+        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;
+            }
+        }
+
+        QPlainTextEdit::keyPressEvent(e);
+
+        if (!c || (hasCtrlOrShiftModifier && e->text().isEmpty()))
+            return;
+
+        // if we have other modifiers, or the text is empty, or the line does not start with our prefix.
+        if (hasOtherModifiers || e->text().isEmpty() || !lineUnderCursor().startsWith(prefix))
+        {
+            c->popup()->hide();
+            return;
+        }
+
+        if (auto word = wordUnderCursor(); word != c->completionPrefix())
+        {
+            c->setCompletionPrefix(word);
+            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!
+    }
+} // namespace Qv2ray::ui::widgets