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qtermwidget-packaging/lib/TerminalDisplay.h

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/*
Copyright 2007-2008 by Robert Knight <robertknight@gmail.com>
Copyright 1997,1998 by Lars Doelle <lars.doelle@on-line.de>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301 USA.
*/
#ifndef TERMINALDISPLAY_H
#define TERMINALDISPLAY_H
// Qt
#include <QColor>
#include <QPointer>
#include <QWidget>
// Konsole
#include "Filter.h"
#include "Character.h"
#include "qtermwidget.h"
//#include "konsole_export.h"
#define KONSOLEPRIVATE_EXPORT
class QDrag;
class QDragEnterEvent;
class QDropEvent;
class QLabel;
class QTimer;
class QEvent;
class QGridLayout;
class QKeyEvent;
class QScrollBar;
class QShowEvent;
class QHideEvent;
class QTimerEvent;
class QWidget;
//class KMenu;
namespace Konsole
{
enum MotionAfterPasting
{
// No move screenwindow after pasting
NoMoveScreenWindow = 0,
// Move start of screenwindow after pasting
MoveStartScreenWindow = 1,
// Move end of screenwindow after pasting
MoveEndScreenWindow = 2
};
extern unsigned short vt100_graphics[32];
class ScreenWindow;
/**
* A widget which displays output from a terminal emulation and sends input keypresses and mouse activity
* to the terminal.
*
* When the terminal emulation receives new output from the program running in the terminal,
* it will update the display by calling updateImage().
*
* TODO More documentation
*/
class KONSOLEPRIVATE_EXPORT TerminalDisplay : public QWidget
{
Q_OBJECT
public:
/** Constructs a new terminal display widget with the specified parent. */
TerminalDisplay(QWidget *parent=0);
virtual ~TerminalDisplay();
/** Returns the terminal color palette used by the display. */
const ColorEntry* colorTable() const;
/** Sets the terminal color palette used by the display. */
void setColorTable(const ColorEntry table[]);
/**
* Sets the seed used to generate random colors for the display
* (in color schemes that support them).
*/
void setRandomSeed(uint seed);
/**
* Returns the seed used to generate random colors for the display
* (in color schemes that support them).
*/
uint randomSeed() const;
/** Sets the opacity of the terminal display. */
void setOpacity(qreal opacity);
/** Sets the background image of the terminal display. */
void setBackgroundImage(QString backgroundImage);
/**
* Specifies whether the terminal display has a vertical scroll bar, and if so whether it
* is shown on the left or right side of the display.
*/
void setScrollBarPosition(QTermWidget::ScrollBarPosition position);
/**
* Sets the current position and range of the display's scroll bar.
*
* @param cursor The position of the scroll bar's thumb.
* @param lines The maximum value of the scroll bar.
*/
void setScroll(int cursor, int lines);
/**
* Scroll to the bottom of the terminal (reset scrolling).
*/
void scrollToEnd();
/**
* Returns the display's filter chain. When the image for the display is updated,
* the text is passed through each filter in the chain. Each filter can define
* hotspots which correspond to certain strings (such as URLs or particular words).
* Depending on the type of the hotspots created by the filter ( returned by Filter::Hotspot::type() )
* the view will draw visual cues such as underlines on mouse-over for links or translucent
* rectangles for markers.
*
* To add a new filter to the view, call:
* viewWidget->filterChain()->addFilter( filterObject );
*/
FilterChain* filterChain() const;
/**
* Updates the filters in the display's filter chain. This will cause
* the hotspots to be updated to match the current image.
*
* WARNING: This function can be expensive depending on the
* image size and number of filters in the filterChain()
*
* TODO - This API does not really allow efficient usage. Revise it so
* that the processing can be done in a better way.
*
* eg:
* - Area of interest may be known ( eg. mouse cursor hovering
* over an area )
*/
void processFilters();
/**
* Returns a list of menu actions created by the filters for the content
* at the given @p position.
*/
QList<QAction*> filterActions(const QPoint& position);
/** Returns true if the cursor is set to blink or false otherwise. */
bool blinkingCursor() { return _hasBlinkingCursor; }
/** Specifies whether or not the cursor blinks. */
void setBlinkingCursor(bool blink);
/** Specifies whether or not text can blink. */
void setBlinkingTextEnabled(bool blink);
void setCtrlDrag(bool enable) { _ctrlDrag=enable; }
bool ctrlDrag() { return _ctrlDrag; }
/**
* This enum describes the methods for selecting text when
* the user triple-clicks within the display.
*/
enum TripleClickMode
{
/** Select the whole line underneath the cursor. */
SelectWholeLine,
/** Select from the current cursor position to the end of the line. */
SelectForwardsFromCursor
};
/** Sets how the text is selected when the user triple clicks within the display. */
void setTripleClickMode(TripleClickMode mode) { _tripleClickMode = mode; }
/** See setTripleClickSelectionMode() */
TripleClickMode tripleClickMode() { return _tripleClickMode; }
void setLineSpacing(uint);
uint lineSpacing() const;
void emitSelection(bool useXselection,bool appendReturn);
/**
* Sets the shape of the keyboard cursor. This is the cursor drawn
* at the position in the terminal where keyboard input will appear.
*
* In addition the terminal display widget also has a cursor for
* the mouse pointer, which can be set using the QWidget::setCursor()
* method.
*
* Defaults to BlockCursor
*/
void setKeyboardCursorShape(QTermWidget::KeyboardCursorShape shape);
/**
* Returns the shape of the keyboard cursor. See setKeyboardCursorShape()
*/
QTermWidget::KeyboardCursorShape keyboardCursorShape() const;
/**
* Sets the color used to draw the keyboard cursor.
*
* The keyboard cursor defaults to using the foreground color of the character
* underneath it.
*
* @param useForegroundColor If true, the cursor color will change to match
* the foreground color of the character underneath it as it is moved, in this
* case, the @p color parameter is ignored and the color of the character
* under the cursor is inverted to ensure that it is still readable.
* @param color The color to use to draw the cursor. This is only taken into
* account if @p useForegroundColor is false.
*/
void setKeyboardCursorColor(bool useForegroundColor , const QColor& color);
/**
* Returns the color of the keyboard cursor, or an invalid color if the keyboard
* cursor color is set to change according to the foreground color of the character
* underneath it.
*/
QColor keyboardCursorColor() const;
/**
* Returns the number of lines of text which can be displayed in the widget.
*
* This will depend upon the height of the widget and the current font.
* See fontHeight()
*/
int lines() { return _lines; }
/**
* Returns the number of characters of text which can be displayed on
* each line in the widget.
*
* This will depend upon the width of the widget and the current font.
* See fontWidth()
*/
int columns() { return _columns; }
/**
* Returns the height of the characters in the font used to draw the text in the display.
*/
int fontHeight() { return _fontHeight; }
/**
* Returns the width of the characters in the display.
* This assumes the use of a fixed-width font.
*/
int fontWidth() { return _fontWidth; }
void setSize(int cols, int lins);
void setFixedSize(int cols, int lins);
// reimplemented
QSize sizeHint() const;
/**
* Sets which characters, in addition to letters and numbers,
* are regarded as being part of a word for the purposes
* of selecting words in the display by double clicking on them.
*
* The word boundaries occur at the first and last characters which
* are either a letter, number, or a character in @p wc
*
* @param wc An array of characters which are to be considered parts
* of a word ( in addition to letters and numbers ).
*/
void setWordCharacters(const QString& wc);
/**
* Returns the characters which are considered part of a word for the
* purpose of selecting words in the display with the mouse.
*
* @see setWordCharacters()
*/
QString wordCharacters() { return _wordCharacters; }
/**
* Sets the type of effect used to alert the user when a 'bell' occurs in the
* terminal session.
*
* The terminal session can trigger the bell effect by calling bell() with
* the alert message.
*/
void setBellMode(int mode);
/**
* Returns the type of effect used to alert the user when a 'bell' occurs in
* the terminal session.
*
* See setBellMode()
*/
int bellMode() { return _bellMode; }
/**
* This enum describes the different types of sounds and visual effects which
* can be used to alert the user when a 'bell' occurs in the terminal
* session.
*/
enum BellMode
{
/** A system beep. */
SystemBeepBell=0,
/**
* KDE notification. This may play a sound, show a passive popup
* or perform some other action depending on the user's settings.
*/
NotifyBell=1,
/** A silent, visual bell (eg. inverting the display's colors briefly) */
VisualBell=2,
/** No bell effects */
NoBell=3
};
void setSelection(const QString &t);
/**
* Reimplemented. Has no effect. Use setVTFont() to change the font
* used to draw characters in the display.
*/
virtual void setFont(const QFont &);
/** Returns the font used to draw characters in the display */
QFont getVTFont() { return font(); }
/**
* Sets the font used to draw the display. Has no effect if @p font
* is larger than the size of the display itself.
*/
void setVTFont(const QFont& font);
/**
* Specified whether anti-aliasing of text in the terminal display
* is enabled or not. Defaults to enabled.
*/
static void setAntialias( bool antialias ) { _antialiasText = antialias; }
/**
* Returns true if anti-aliasing of text in the terminal is enabled.
*/
static bool antialias() { return _antialiasText; }
/**
* Specifies whether characters with intense colors should be rendered
* as bold. Defaults to true.
*/
void setBoldIntense(bool value) { _boldIntense = value; }
/**
* Returns true if characters with intense colors are rendered in bold.
*/
bool getBoldIntense() { return _boldIntense; }
/**
* Sets whether or not the current height and width of the
* terminal in lines and columns is displayed whilst the widget
* is being resized.
*/
void setTerminalSizeHint(bool on) { _terminalSizeHint=on; }
/**
* Returns whether or not the current height and width of
* the terminal in lines and columns is displayed whilst the widget
* is being resized.
*/
bool terminalSizeHint() { return _terminalSizeHint; }
/**
* Sets whether the terminal size display is shown briefly
* after the widget is first shown.
*
* See setTerminalSizeHint() , isTerminalSizeHint()
*/
void setTerminalSizeStartup(bool on) { _terminalSizeStartup=on; }
/**
* Sets the status of the BiDi rendering inside the terminal display.
* Defaults to disabled.
*/
void setBidiEnabled(bool set) { _bidiEnabled=set; }
/**
* Returns the status of the BiDi rendering in this widget.
*/
bool isBidiEnabled() { return _bidiEnabled; }
/**
* Sets the terminal screen section which is displayed in this widget.
* When updateImage() is called, the display fetches the latest character image from the
* the associated terminal screen window.
*
* In terms of the model-view paradigm, the ScreenWindow is the model which is rendered
* by the TerminalDisplay.
*/
void setScreenWindow( ScreenWindow* window );
/** Returns the terminal screen section which is displayed in this widget. See setScreenWindow() */
ScreenWindow* screenWindow() const;
static bool HAVE_TRANSPARENCY;
void setMotionAfterPasting(MotionAfterPasting action);
int motionAfterPasting();
// maps a point on the widget to the position ( ie. line and column )
// of the character at that point.
void getCharacterPosition(const QPoint& widgetPoint,int& line,int& column) const;
public slots:
/**
* Causes the terminal display to fetch the latest character image from the associated
* terminal screen ( see setScreenWindow() ) and redraw the display.
*/
void updateImage();
/** Essentially calles processFilters().
*/
void updateFilters();
/**
* Causes the terminal display to fetch the latest line status flags from the
* associated terminal screen ( see setScreenWindow() ).
*/
void updateLineProperties();
/** Copies the selected text to the clipboard. */
void copyClipboard();
/**
* Pastes the content of the clipboard into the
* display.
*/
void pasteClipboard();
/**
* Pastes the content of the selection into the
* display.
*/
void pasteSelection();
/**
* Changes whether the flow control warning box should be shown when the flow control
* stop key (Ctrl+S) are pressed.
*/
void setFlowControlWarningEnabled(bool enabled);
/**
* Returns true if the flow control warning box is enabled.
* See outputSuspended() and setFlowControlWarningEnabled()
*/
bool flowControlWarningEnabled() const
{ return _flowControlWarningEnabled; }
/**
* Causes the widget to display or hide a message informing the user that terminal
* output has been suspended (by using the flow control key combination Ctrl+S)
*
* @param suspended True if terminal output has been suspended and the warning message should
* be shown or false to indicate that terminal output has been resumed and that
* the warning message should disappear.
*/
void outputSuspended(bool suspended);
/**
* Sets whether the program whoose output is being displayed in the view
* is interested in mouse events.
*
* If this is set to true, mouse signals will be emitted by the view when the user clicks, drags
* or otherwise moves the mouse inside the view.
* The user interaction needed to create selections will also change, and the user will be required
* to hold down the shift key to create a selection or perform other mouse activities inside the
* view area - since the program running in the terminal is being allowed to handle normal mouse
* events itself.
*
* @param usesMouse Set to true if the program running in the terminal is interested in mouse events
* or false otherwise.
*/
void setUsesMouse(bool usesMouse);
/** See setUsesMouse() */
bool usesMouse() const;
void setBracketedPasteMode(bool bracketedPasteMode);
bool bracketedPasteMode() const;
/**
* Shows a notification that a bell event has occurred in the terminal.
* TODO: More documentation here
*/
void bell(const QString& message);
/**
* Sets the background of the display to the specified color.
* @see setColorTable(), setForegroundColor()
*/
void setBackgroundColor(const QColor& color);
/**
* Sets the text of the display to the specified color.
* @see setColorTable(), setBackgroundColor()
*/
void setForegroundColor(const QColor& color);
void selectionChanged();
signals:
/**
* Emitted when the user presses a key whilst the terminal widget has focus.
*/
void keyPressedSignal(QKeyEvent *e);
/**
* A mouse event occurred.
* @param button The mouse button (0 for left button, 1 for middle button, 2 for right button, 3 for release)
* @param column The character column where the event occurred
* @param line The character row where the event occurred
* @param eventType The type of event. 0 for a mouse press / release or 1 for mouse motion
*/
void mouseSignal(int button, int column, int line, int eventType);
void changedFontMetricSignal(int height, int width);
void changedContentSizeSignal(int height, int width);
/**
* Emitted when the user right clicks on the display, or right-clicks with the Shift
* key held down if usesMouse() is true.
*
* This can be used to display a context menu.
*/
void configureRequest(const QPoint& position);
/**
* When a shortcut which is also a valid terminal key sequence is pressed while
* the terminal widget has focus, this signal is emitted to allow the host to decide
* whether the shortcut should be overridden.
* When the shortcut is overridden, the key sequence will be sent to the terminal emulation instead
* and the action associated with the shortcut will not be triggered.
*
* @p override is set to false by default and the shortcut will be triggered as normal.
*/
void overrideShortcutCheck(QKeyEvent* keyEvent,bool& override);
void isBusySelecting(bool);
void sendStringToEmu(const char*);
// qtermwidget signals
void copyAvailable(bool);
void termGetFocus();
void termLostFocus();
void notifyBell(const QString&);
void usesMouseChanged();
protected:
virtual bool event( QEvent * );
virtual void paintEvent( QPaintEvent * );
virtual void showEvent(QShowEvent*);
virtual void hideEvent(QHideEvent*);
virtual void resizeEvent(QResizeEvent*);
virtual void fontChange(const QFont &font);
virtual void focusInEvent(QFocusEvent* event);
virtual void focusOutEvent(QFocusEvent* event);
virtual void keyPressEvent(QKeyEvent* event);
virtual void mouseDoubleClickEvent(QMouseEvent* ev);
virtual void mousePressEvent( QMouseEvent* );
virtual void mouseReleaseEvent( QMouseEvent* );
virtual void mouseMoveEvent( QMouseEvent* );
virtual void extendSelection( const QPoint& pos );
virtual void wheelEvent( QWheelEvent* );
virtual bool focusNextPrevChild( bool next );
// drag and drop
virtual void dragEnterEvent(QDragEnterEvent* event);
virtual void dropEvent(QDropEvent* event);
void doDrag();
enum DragState { diNone, diPending, diDragging };
struct _dragInfo {
DragState state;
QPoint start;
QDrag *dragObject;
} dragInfo;
// classifies the 'ch' into one of three categories
// and returns a character to indicate which category it is in
//
// - A space (returns ' ')
// - Part of a word (returns 'a')
// - Other characters (returns the input character)
QChar charClass(QChar ch) const;
void clearImage();
void mouseTripleClickEvent(QMouseEvent* ev);
// reimplemented
virtual void inputMethodEvent ( QInputMethodEvent* event );
virtual QVariant inputMethodQuery( Qt::InputMethodQuery query ) const;
protected slots:
void scrollBarPositionChanged(int value);
void blinkEvent();
void blinkCursorEvent();
//Renables bell noises and visuals. Used to disable further bells for a short period of time
//after emitting the first in a sequence of bell events.
void enableBell();
private slots:
void swapColorTable();
void tripleClickTimeout(); // resets possibleTripleClick
private:
// -- Drawing helpers --
// determine the width of this text
int textWidth(int startColumn, int length, int line) const;
// determine the area that encloses this series of characters
QRect calculateTextArea(int topLeftX, int topLeftY, int startColumn, int line, int length);
// divides the part of the display specified by 'rect' into
// fragments according to their colors and styles and calls
// drawTextFragment() to draw the fragments
void drawContents(QPainter &paint, const QRect &rect);
// draws a section of text, all the text in this section
// has a common color and style
void drawTextFragment(QPainter& painter, const QRect& rect,
const QString& text, const Character* style);
// draws the background for a text fragment
// if useOpacitySetting is true then the color's alpha value will be set to
// the display's transparency (set with setOpacity()), otherwise the background
// will be drawn fully opaque
void drawBackground(QPainter& painter, const QRect& rect, const QColor& color,
bool useOpacitySetting);
// draws the cursor character
void drawCursor(QPainter& painter, const QRect& rect , const QColor& foregroundColor,
const QColor& backgroundColor , bool& invertColors);
// draws the characters or line graphics in a text fragment
void drawCharacters(QPainter& painter, const QRect& rect, const QString& text,
const Character* style, bool invertCharacterColor);
// draws a string of line graphics
void drawLineCharString(QPainter& painter, int x, int y,
const QString& str, const Character* attributes);
// draws the preedit string for input methods
void drawInputMethodPreeditString(QPainter& painter , const QRect& rect);
// --
// maps an area in the character image to an area on the widget
QRect imageToWidget(const QRect& imageArea) const;
// the area where the preedit string for input methods will be draw
QRect preeditRect() const;
// shows a notification window in the middle of the widget indicating the terminal's
// current size in columns and lines
void showResizeNotification();
// scrolls the image by a number of lines.
// 'lines' may be positive ( to scroll the image down )
// or negative ( to scroll the image up )
// 'region' is the part of the image to scroll - currently only
// the top, bottom and height of 'region' are taken into account,
// the left and right are ignored.
void scrollImage(int lines , const QRect& region);
void calcGeometry();
void propagateSize();
void updateImageSize();
void makeImage();
void paintFilters(QPainter& painter);
// returns a region covering all of the areas of the widget which contain
// a hotspot
QRegion hotSpotRegion() const;
// returns the position of the cursor in columns and lines
QPoint cursorPosition() const;
// redraws the cursor
void updateCursor();
bool handleShortcutOverrideEvent(QKeyEvent* event);
// the window onto the terminal screen which this display
// is currently showing.
QPointer<ScreenWindow> _screenWindow;
bool _allowBell;
QGridLayout* _gridLayout;
bool _fixedFont; // has fixed pitch
int _fontHeight; // height
int _fontWidth; // width
int _fontAscent; // ascend
bool _boldIntense; // Whether intense colors should be rendered with bold font
int _leftMargin; // offset
int _topMargin; // offset
int _lines; // the number of lines that can be displayed in the widget
int _columns; // the number of columns that can be displayed in the widget
int _usedLines; // the number of lines that are actually being used, this will be less
// than 'lines' if the character image provided with setImage() is smaller
// than the maximum image size which can be displayed
int _usedColumns; // the number of columns that are actually being used, this will be less
// than 'columns' if the character image provided with setImage() is smaller
// than the maximum image size which can be displayed
int _contentHeight;
int _contentWidth;
Character* _image; // [lines][columns]
// only the area [usedLines][usedColumns] in the image contains valid data
int _imageSize;
QVector<LineProperty> _lineProperties;
ColorEntry _colorTable[TABLE_COLORS];
uint _randomSeed;
bool _resizing;
bool _terminalSizeHint;
bool _terminalSizeStartup;
bool _bidiEnabled;
bool _mouseMarks;
bool _bracketedPasteMode;
QPoint _iPntSel; // initial selection point
QPoint _pntSel; // current selection point
QPoint _tripleSelBegin; // help avoid flicker
int _actSel; // selection state
bool _wordSelectionMode;
bool _lineSelectionMode;
bool _preserveLineBreaks;
bool _columnSelectionMode;
QClipboard* _clipboard;
QScrollBar* _scrollBar;
QTermWidget::ScrollBarPosition _scrollbarLocation;
QString _wordCharacters;
int _bellMode;
bool _blinking; // hide text in paintEvent
bool _hasBlinker; // has characters to blink
bool _cursorBlinking; // hide cursor in paintEvent
bool _hasBlinkingCursor; // has blinking cursor enabled
bool _allowBlinkingText; // allow text to blink
bool _ctrlDrag; // require Ctrl key for drag
TripleClickMode _tripleClickMode;
bool _isFixedSize; //Columns / lines are locked.
QTimer* _blinkTimer; // active when hasBlinker
QTimer* _blinkCursorTimer; // active when hasBlinkingCursor
//QMenu* _drop;
QString _dropText;
int _dndFileCount;
bool _possibleTripleClick; // is set in mouseDoubleClickEvent and deleted
// after QApplication::doubleClickInterval() delay
QLabel* _resizeWidget;
QTimer* _resizeTimer;
bool _flowControlWarningEnabled;
//widgets related to the warning message that appears when the user presses Ctrl+S to suspend
//terminal output - informing them what has happened and how to resume output
QLabel* _outputSuspendedLabel;
uint _lineSpacing;
bool _colorsInverted; // true during visual bell
QSize _size;
QRgb _blendColor;
QPixmap _backgroundImage;
// list of filters currently applied to the display. used for links and
// search highlight
TerminalImageFilterChain* _filterChain;
QRegion _mouseOverHotspotArea;
QTermWidget::KeyboardCursorShape _cursorShape;
// custom cursor color. if this is invalid then the foreground
// color of the character under the cursor is used
QColor _cursorColor;
MotionAfterPasting mMotionAfterPasting;
struct InputMethodData
{
QString preeditString;
QRect previousPreeditRect;
};
InputMethodData _inputMethodData;
static bool _antialiasText; // do we antialias or not
//the delay in milliseconds between redrawing blinking text
static const int TEXT_BLINK_DELAY = 500;
static const int DEFAULT_LEFT_MARGIN = 1;
static const int DEFAULT_TOP_MARGIN = 1;
public:
static void setTransparencyEnabled(bool enable)
{
HAVE_TRANSPARENCY = enable;
}
};
class AutoScrollHandler : public QObject
{
Q_OBJECT
public:
AutoScrollHandler(QWidget* parent);
protected:
virtual void timerEvent(QTimerEvent* event);
virtual bool eventFilter(QObject* watched,QEvent* event);
private:
QWidget* widget() const { return static_cast<QWidget*>(parent()); }
int _timerId;
};
}
#endif // TERMINALDISPLAY_H
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