text: /****************************************************************************
  **
  ** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
  ** Contact: http://www.qt-project.org/legal
  **
  ** This file is part of the QtWidgets module of the Qt Toolkit.
  **
  ** $QT_BEGIN_LICENSE:LGPL$
  ** Commercial License Usage
  ** Licensees holding valid commercial Qt licenses may use this file in
  ** accordance with the commercial license agreement provided with the
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  ** Alternatively, this file may be used under the terms of the GNU Lesser
  ** General Public License version 2.1 as published by the Free Software
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  ** GNU General Public License Usage
  ** Alternatively, this file may be used under the terms of the GNU
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  ****************************************************************************/
  
  #ifndef QPLAINTEXTEDIT_P_H
  #define QPLAINTEXTEDIT_P_H
  
  //
  //  W A R N I N G
  //  -------------
  //
  // This file is not part of the Qt API.  It exists purely as an
  // implementation detail.  This header file may change from version to
  // version without notice, or even be removed.
  //
  // We mean it.
  //
  
  #include "private/qabstractscrollarea_p.h"
  #include "QtGui/qtextdocumentfragment.h"
  #include "QtWidgets/qscrollbar.h"
  #include "QtGui/qtextcursor.h"
  #include "QtGui/qtextformat.h"
  #include "QtWidgets/qmenu.h"
  #include "QtGui/qabstracttextdocumentlayout.h"
  #include "QtCore/qbasictimer.h"
  #include "private/qwidgettextcontrol_p.h"
  #include "qplaintextedit.h"
  
  #ifndef QT_NO_TEXTEDIT
  
  QT_BEGIN_NAMESPACE
  
  class QMimeData;
  
  class QPlainTextEdit;
  class ExtraArea;
  
  class QPlainTextEditControl : public QWidgetTextControl
  {
      Q_OBJECT
  public:
      QPlainTextEditControl(QPlainTextEdit *parent);
  
  
      QMimeData *createMimeDataFromSelection() const;
      bool canInsertFromMimeData(const QMimeData *source) const;
      void insertFromMimeData(const QMimeData *source);
      int hitTest(const QPointF &point, Qt::HitTestAccuracy = Qt::FuzzyHit) const;
      QRectF blockBoundingRect(const QTextBlock &block) const;
      inline QRectF cursorRect(const QTextCursor &cursor) const {
          QRectF r = QWidgetTextControl::cursorRect(cursor);
          r.setLeft(qMax(r.left(), (qreal) 0.));
          return r;
      }
      inline QRectF cursorRect() { return cursorRect(textCursor()); }
      void ensureCursorVisible() {
          textEdit->ensureCursorVisible();
          emit microFocusChanged();
      }
  
  
      QPlainTextEdit *textEdit;
      int topBlock;
      QTextBlock firstVisibleBlock() const;
  
      QVariant loadResource(int type, const QUrl &name) {
          return textEdit->loadResource(type, name);
      }
  
  };
  
  
  class QPlainTextEditPrivate : public QAbstractScrollAreaPrivate
  {
      Q_DECLARE_PUBLIC(QPlainTextEdit)
  public:
      QPlainTextEditPrivate();
  
      void init(const QString &txt = QString());
      void _q_repaintContents(const QRectF &contentsRect);
  
      inline QPoint mapToContents(const QPoint &point) const
          { return QPoint(point.x() + horizontalOffset(), point.y() + verticalOffset()); }
  
      void _q_adjustScrollbars();
      void _q_verticalScrollbarActionTriggered(int action);
      void ensureViewportLayouted();
      void relayoutDocument();
  
      void pageUpDown(QTextCursor::MoveOperation op, QTextCursor::MoveMode moveMode, bool moveCursor = true);
  
      inline int horizontalOffset() const
          { return (q_func()->isRightToLeft() ? (hbar->maximum() - hbar->value()) : hbar->value()); }
      qreal verticalOffset(int topBlock, int topLine) const;
      qreal verticalOffset() const;
  
      inline void sendControlEvent(QEvent *e)
          { control->processEvent(e, QPointF(horizontalOffset(), verticalOffset()), viewport); }
  
      void updateDefaultTextOption();
  
      QPlainTextEditControl *control;
  
      bool tabChangesFocus;
  
      QBasicTimer autoScrollTimer;
      QPoint autoScrollDragPos;
  
      QPlainTextEdit::LineWrapMode lineWrap;
      QTextOption::WrapMode wordWrap;
  
      uint showCursorOnInitialShow : 1;
      uint backgroundVisible : 1;
      uint centerOnScroll : 1;
      uint inDrag : 1;
      uint clickCausedFocus : 1;
  
      int topLine;
      qreal topLineFracture; // for non-int sized fonts
  
      void setTopLine(int visualTopLine, int dx = 0);
      void setTopBlock(int newTopBlock, int newTopLine, int dx = 0);
  
      void ensureVisible(int position, bool center, bool forceCenter = false);
      void ensureCursorVisible(bool center = false);
      void updateViewport();
  
      QPointer<QPlainTextDocumentLayout> documentLayoutPtr;
  
      void append(const QString &text, Qt::TextFormat format = Qt::AutoText);
  
      qreal pageUpDownLastCursorY;
      bool pageUpDownLastCursorYIsValid;
  
  
  #ifdef QT_KEYPAD_NAVIGATION
      QBasicTimer deleteAllTimer;
  #endif
  
      void _q_cursorPositionChanged();
      void _q_modificationChanged(bool);
  
      int originalOffsetY;
      QString placeholderText;
  };
  
  QT_END_NAMESPACE
  
  #endif // QT_NO_TEXTEDIT
  
  #endif // QPLAINTEXTEDIT_P_H
  