124 lines
3.8 KiB
C++
124 lines
3.8 KiB
C++
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// completertextedit.cpp
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#include "completertextedit.h"
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#include <QCoreApplication>
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#include <QAbstractItemView>
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#include <QCompleter>
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#include <QKeyEvent>
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#include <QString>
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#include <QTextCursor>
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CompleterTextEdit::CompleterTextEdit(QWidget *parent) :
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QTextEdit(parent), m_completer(NULL) {
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}
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QCompleter * CompleterTextEdit::GetCompleter() {
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return m_completer;
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}
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void CompleterTextEdit::setCompleter(QCompleter *completer)
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{
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m_completer = completer;
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if (m_completer) {
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m_completer->setWidget(this);
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connect(m_completer, SIGNAL(activated(QString)),
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this, SLOT(onCompleterActivated(QString)));
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}
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}
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void CompleterTextEdit::keyReleaseEvent(QKeyEvent *e)
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{
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QTextEdit::keyReleaseEvent(e);
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if(e->key()==Qt::Key_Comma) {
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// QCoreApplication::postEvent(this, new QKeyEvent(QEvent::KeyPress, Qt::Key_Space, Qt::NoModifier, 0));
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return;
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};
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}
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void CompleterTextEdit::mousePressEvent(QMouseEvent *e)
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{
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if (e->button() == Qt::MiddleButton) {
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QTextCursor cursor = textCursor();
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int pos1=cursor.selectionStart();
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int pos2=cursor.selectionEnd();
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QString text1=toPlainText();
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text1=text1.mid(pos1,pos2-pos1);
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// cursor.setPosition(0);
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cursor.clearSelection();
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QMouseEvent ss(e->type(),e->pos(),Qt::LeftButton,e->buttons(),e->modifiers());
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QTextEdit::mousePressEvent(&ss);
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QTextEdit::mouseReleaseEvent(&ss);
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QTextCursor cursor1 = textCursor();
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setTextCursor(cursor1);
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if(text1.lastIndexOf(0x2029)>=0) {
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text1.remove(0x2029);
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}
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textCursor().insertText(text1);
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}
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else QTextEdit::mousePressEvent(e);
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}
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void CompleterTextEdit::keyPressEvent(QKeyEvent *e) {
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if (m_completer) {
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if (m_completer->popup()->isVisible()) {
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switch(e->key()) {
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case Qt::Key_Escape:
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case Qt::Key_Enter:
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case Qt::Key_Return:
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case Qt::Key_Tab:
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e->ignore();
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return;
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default:
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break;
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}
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}
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QTextEdit::keyPressEvent(e);
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if(e->key()==Qt::Key_Comma) {
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this->insertPlainText(" ");
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}
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if(e->key()!=Qt::Key_Comma&&e->key()!=Qt::Key_Space
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&&e->key()!=Qt::Key_Up
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&&e->key()!=Qt::Key_Down
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&&e->key()!=Qt::Key_Left
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&&e->key()!=Qt::Key_Right
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) {
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QString completerPrefix = this->wordUnderCursor();
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m_completer->setCompletionPrefix(completerPrefix); // 通过设置QCompleter的前缀，来让Completer寻找关键词
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m_completer->complete();
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}
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}
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else {
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QTextEdit::keyPressEvent(e);
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}
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}
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void CompleterTextEdit::onCompleterActivated(const QString &completion) {
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QString completionPrefix = wordUnderCursor(),
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shouldInertText = completion;
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QTextCursor cursor = this->textCursor();
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if (!completion.contains(completionPrefix)) {// delete the previously typed.
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cursor.movePosition(QTextCursor::Left, QTextCursor::KeepAnchor, completionPrefix.size());
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cursor.clearSelection();
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} else { // 补全相应的字符
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shouldInertText = shouldInertText.replace(
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shouldInertText.indexOf(completionPrefix), completionPrefix.size(), "");
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}
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cursor.insertText(shouldInertText);
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}
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QString CompleterTextEdit::wordUnderCursor() { //不断向左移动cursor，并选中字符，并查看选中的单词中是否含有空格——空格作为单词的分隔符
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QTextCursor cursor = this->textCursor();
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int pos1=cursor.position();
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while (cursor.movePosition(QTextCursor::Left, QTextCursor::KeepAnchor)) {
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int pos2=cursor.position();
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if(pos2-pos1>1) {
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break;
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}
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pos1=pos2;
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if (cursor.selectedText().contains(" ")||cursor.selectedText().contains("\n")||cursor.selectedText().contains(",")||cursor.selectedText().contains("\r")) {
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break;
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}
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}
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QString cs=cursor.selectedText();
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cs=cs.remove(" ");
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cs=cs.remove(",");
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cs=cs.remove("\r");
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cs=cs.remove("\n");
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return cs;
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}
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