qtextcontrol.cpp

奇趣公司比较新的qt/emd版本

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#include "qtextcontrol_p.h"
#include "qtextcontrol_p_p.h"
#include "qlineedit.h"

#ifndef QT_NO_TEXTCONTROL

#include <qfont.h>
#include <qpainter.h>
#include <qevent.h>
#include <qdebug.h>
#include <qmime.h>
#include <qdrag.h>
#include <qclipboard.h>
#include <qmenu.h>
#include <qstyle.h>
#include <qtimer.h>
#include "private/qtextdocumentlayout_p.h"
#include "private/qtextedit_p.h"
#include "qtextdocument.h"
#include "private/qtextdocument_p.h"
#include "qtextlist.h"
#include "private/qtextcontrol_p.h"
#include "qgraphicssceneevent.h"
#include "qprinter.h"

#include <qtextformat.h>
#include <qdatetime.h>
#include <qapplication.h>
#include <limits.h>
#include <qtexttable.h>
#include <qvariant.h>
#include <qurl.h>
#include <qdesktopservices.h>
#include <qinputcontext.h>
#include <qtooltip.h>
#include <qstyleoption.h>

#ifndef QT_NO_SHORTCUT
#include <qkeysequence.h>
#define ACCEL_KEY(k) QString::fromLatin1("\t") + QString(QKeySequence(k))
#else
#define ACCEL_KEY(k) QString()
#endif

// could go into QTextCursor...
static QTextLine currentTextLine(const QTextCursor &cursor)
{
    const QTextBlock block = cursor.block();
    if (!block.isValid())
        return QTextLine();

    const QTextLayout *layout = block.layout();
    if (!layout)
        return QTextLine();

    const int relativePos = cursor.position() - block.position();
    return layout->lineForTextPosition(relativePos);
}

QTextControlPrivate::QTextControlPrivate()
    : doc(0), cursorOn(false), cursorIsFocusIndicator(false),
      interactionFlags(Qt::TextEditorInteraction),
#ifndef QT_NO_DRAGANDDROP
      mousePressed(false), mightStartDrag(false),
#endif
      lastSelectionState(false), ignoreAutomaticScrollbarAdjustement(false),
      overwriteMode(false),
      acceptRichText(true),
      preeditCursor(0), hideCursor(false),
      hasFocus(false),
#ifdef QT_KEYPAD_NAVIGATION
      hasEditFocus(false),
#endif
      layoutDirection(QApplication::layoutDirection()),
      isEnabled(true),
      hadSelectionOnMousePress(false),
      openExternalLinks(false)
{}

bool QTextControlPrivate::cursorMoveKeyEvent(QKeyEvent *e)
{
#ifdef QT_NO_SHORTCUT
    Q_UNUSED(e);
#endif

    Q_Q(QTextControl);
    if (cursor.isNull())
        return false;

    const QTextCursor oldSelection = cursor;
    const int oldCursorPos = cursor.position();

    QTextCursor::MoveMode mode = QTextCursor::MoveAnchor;
    QTextCursor::MoveOperation op = QTextCursor::NoMove;

    if (false) {
    }
#ifndef QT_NO_SHORTCUT
    if (e == QKeySequence::MoveToNextChar) {
            op = QTextCursor::Right;
    }
    else if (e == QKeySequence::MoveToPreviousChar) {
            op = QTextCursor::Left;
    }
    else if (e == QKeySequence::SelectNextChar) {
           op = QTextCursor::Right;
           mode = QTextCursor::KeepAnchor;
    }
    else if (e == QKeySequence::SelectPreviousChar) {
            op = QTextCursor::Left;
            mode = QTextCursor::KeepAnchor;
    }
    else if (e == QKeySequence::SelectNextWord) {
            op = QTextCursor::WordRight;
            mode = QTextCursor::KeepAnchor;
    }
    else if (e == QKeySequence::SelectPreviousWord) {
            op = QTextCursor::WordLeft;
            mode = QTextCursor::KeepAnchor;
    }
    else if (e == QKeySequence::SelectStartOfLine) {
            op = QTextCursor::StartOfLine;
            mode = QTextCursor::KeepAnchor;
    }
    else if (e == QKeySequence::SelectEndOfLine) {
            op = QTextCursor::EndOfLine;
            mode = QTextCursor::KeepAnchor;
    }
    else if (e == QKeySequence::SelectStartOfBlock) {
            op = QTextCursor::StartOfBlock;
            mode = QTextCursor::KeepAnchor;
    }
    else if (e == QKeySequence::SelectEndOfBlock) {
            op = QTextCursor::EndOfBlock;
            mode = QTextCursor::KeepAnchor;
    }
    else if (e == QKeySequence::SelectStartOfDocument) {
            op = QTextCursor::Start;
            mode = QTextCursor::KeepAnchor;
    }
    else if (e == QKeySequence::SelectEndOfDocument) {
            op = QTextCursor::End;
            mode = QTextCursor::KeepAnchor;
    }
    else if (e == QKeySequence::SelectPreviousLine) {
            op = QTextCursor::Up;
            mode = QTextCursor::KeepAnchor;
    }
    else if (e == QKeySequence::SelectNextLine) {
            op = QTextCursor::Down;
            mode = QTextCursor::KeepAnchor;
            {
                QTextBlock block = cursor.block();
                QTextLine line = currentTextLine(cursor);
                if (!block.next().isValid()
                    && line.isValid()
                    && line.lineNumber() == block.layout()->lineCount() - 1)
                    op = QTextCursor::End;
            }
    }
    else if (e == QKeySequence::SelectNextLine) {
            op = QTextCursor::Down;
            mode = QTextCursor::KeepAnchor;
            {
                QTextBlock block = cursor.block();
                QTextLine line = currentTextLine(cursor);
                if (!block.next().isValid()
                    && line.isValid()
                    && line.lineNumber() == block.layout()->lineCount() - 1)
                    op = QTextCursor::End;
            }
    }
    else if (e == QKeySequence::MoveToNextWord) {
            op = QTextCursor::WordRight;
    }
    else if (e == QKeySequence::MoveToPreviousWord) {
            op = QTextCursor::WordLeft;
    }
    else if (e == QKeySequence::MoveToEndOfBlock) {
            op = QTextCursor::EndOfBlock;
    }
    else if (e == QKeySequence::MoveToStartOfBlock) {
            op = QTextCursor::StartOfBlock;
    }
    else if (e == QKeySequence::MoveToNextLine) {
            op = QTextCursor::Down;
    }
    else if (e == QKeySequence::MoveToPreviousLine) {
            op = QTextCursor::Up;
    }
    else if (e == QKeySequence::MoveToPreviousLine) {
            op = QTextCursor::Up;
    }
    else if (e == QKeySequence::MoveToStartOfLine) {
            op = QTextCursor::StartOfLine;
    }
    else if (e == QKeySequence::MoveToEndOfLine) {
            op = QTextCursor::EndOfLine;
    }
    else if (e == QKeySequence::MoveToStartOfDocument) {
            op = QTextCursor::Start;
    }
    else if (e == QKeySequence::MoveToEndOfDocument) {
            op = QTextCursor::End;
    }
#endif // QT_NO_SHORTCUT
    else {
        return false;
    }

// Except for pageup and pagedown, Mac OS X has very different behavior, we don't do it all, but
// here's the breakdown:
// Shift still works as an anchor, but only one of the other keys can be down Ctrl (Command),
// Alt (Option), or Meta (Control).
// Command/Control + Left/Right -- Move to left or right of the line
//                 + Up/Down -- Move to top bottom of the file. (Control doesn't move the cursor)
// Option + Left/Right -- Move one word Left/right.
//        + Up/Down  -- Begin/End of Paragraph.
// Home/End Top/Bottom of file. (usually don't move the cursor, but will select)

    const bool moved = cursor.movePosition(op, mode);
    q->ensureCursorVisible();

    if (moved) {
        if (cursor.position() != oldCursorPos)
            emit q->cursorPositionChanged();
        emit q->microFocusChanged();
    }
#ifdef QT_KEYPAD_NAVIGATION
    else if (QApplication::keypadNavigationEnabled()
        && (e->key() == Qt::Key_Up || e->key() == Qt::Key_Down)) {
        return false;
    }
#endif

    selectionChanged(/*forceEmitSelectionChanged =*/(mode == QTextCursor::KeepAnchor));

    repaintOldAndNewSelection(oldSelection);

    return true;
}

void QTextControlPrivate::updateCurrentCharFormat()
{
    Q_Q(QTextControl);

    QTextCharFormat fmt = cursor.charFormat();
    if (fmt == lastCharFormat)
        return;
    lastCharFormat = fmt;

    emit q->currentCharFormatChanged(fmt);
    emit q->microFocusChanged();
}

void QTextControlPrivate::indent()
{
    QTextBlockFormat blockFmt = cursor.blockFormat();

    QTextList *list = cursor.currentList();
    if (!list) {
        QTextBlockFormat modifier;
        modifier.setIndent(blockFmt.indent() + 1);
        cursor.mergeBlockFormat(modifier);
    } else {
        QTextListFormat format = list->format();
        format.setIndent(format.indent() + 1);

        if (list->itemNumber(cursor.block()) == 1)
            list->setFormat(format);
        else
            cursor.createList(format);
    }
}

void QTextControlPrivate::outdent()
{
    QTextBlockFormat blockFmt = cursor.blockFormat();

    QTextList *list = cursor.currentList();

    if (!list) {
        QTextBlockFormat modifier;
        modifier.setIndent(blockFmt.indent() - 1);
        cursor.mergeBlockFormat(modifier);
    } else {
        QTextListFormat listFmt = list->format();
        listFmt.setIndent(listFmt.indent() - 1);
        list->setFormat(listFmt);
    }
}

void QTextControlPrivate::gotoNextTableCell()
{
    QTextTable *table = cursor.currentTable();
    QTextTableCell cell = table->cellAt(cursor);

    int newColumn = cell.column() + cell.columnSpan();
    int newRow = cell.row();

    if (newColumn >= table->columns()) {
        newColumn = 0;
        ++newRow;
        if (newRow >= table->rows())
            table->insertRows(table->rows(), 1);
    }

    cell = table->cellAt(newRow, newColumn);
    cursor = cell.firstCursorPosition();
}

void QTextControlPrivate::gotoPreviousTableCell()
{
    QTextTable *table = cursor.currentTable();
    QTextTableCell cell = table->cellAt(cursor);

    int newColumn = cell.column() - 1;
    int newRow = cell.row();

    if (newColumn < 0) {
        newColumn = table->columns() - 1;
        --newRow;
        if (newRow < 0)
            return;
    }

    cell = table->cellAt(newRow, newColumn);
    cursor = cell.firstCursorPosition();
}

void QTextControlPrivate::createAutoBulletList()
{
    cursor.beginEditBlock();

    QTextBlockFormat blockFmt = cursor.blockFormat();

    QTextListFormat listFmt;
    listFmt.setStyle(QTextListFormat::ListDisc);
    listFmt.setIndent(blockFmt.indent() + 1);

    blockFmt.setIndent(0);
    cursor.setBlockFormat(blockFmt);

    cursor.createList(listFmt);

    cursor.endEditBlock();
}

void QTextControlPrivate::init(Qt::TextFormat format, const QString &text, QTextDocument *document)
{
    setContent(format, text, document);
    doc->setUndoRedoEnabled(interactionFlags & Qt::TextEditable);
}

void QTextControlPrivate::setContent(Qt::TextFormat format, const QString &text, QTextDocument *document)
{
    Q_Q(QTextControl);

    // for use when called from setPlainText. we may want to re-use the currently
    // set char format then.
    const QTextCharFormat charFormatForInsertion = cursor.charFormat();

    bool clearDocument = true;
    if (!doc) {
        palette = QApplication::palette("QTextControl");

        if (document) {
            doc = document;
            clearDocument = false;
        } else {