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koffice/lib/kofficeui/KoGuides.h

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// -*- Mode: c++; c-basic-offset: 4; indent-tabs-mode: nil; tab-width: 4; -*-
/* This file is part of the KDE project
Copyright (C) 2005 Thorsten Zachmann <zachmann@kde.org>
Copyright (C) 2005 Casper Boemann Rasmussen <cbr@boemann.dk>
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public License
along with this library; see the file COPYING.LIB. If not, write to
the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.
*/
#ifndef KOGUIDES_H
#define KOGUIDES_H
#include <tqevent.h>
#include <tqobject.h>
#include <koffice_export.h>
class TQPaintDevice;
class KoPoint;
class KoRect;
class KoView;
class KoZoomHandler;
class KOFFICEUI_EXPORT KoGuides : public TQObject
{
Q_OBJECT
public:
/**
* @brief Constructor
*
* @param view The view in which the guides will be shown
* @param zoomHandler The zoom handler of the view
*/
KoGuides( KoView *view, KoZoomHandler *zoomHandler );
/**
* @brief Destructor
*/
~KoGuides();
/**
* @brief Paint the guides
*
* @param painter with which the guides are painted
*/
void paintGuides( TQPainter &painter );
typedef int SnapStatus;
static const SnapStatus SNAP_NONE, SNAP_HORIZ, SNAP_VERT, SNAP_BOTH;
/**
* @brief Handle mousePressEvent
*
* This checks if a mousePressEvent would affect a guide line.
* If the mouse is pressed over a guide line it gets selected.
* Guide lines which were select get unselect.
* If also the Ctrl Key is pressed the selection of the guide
* gets toggled.
* If no guide is under the position all guides get deselected.
*
* @param e TQMouseEvent
*
* @return true if the event was handled
* @return false otherwise
* The event counts a not handled when only guides where
* deselected.
*/
bool mousePressEvent( TQMouseEvent *e );
/**
* @brief Handle mouseMoveEvent
*
* If the mouse button is pressed and a guide was selected it moves the
* selected guides.
* If the mouse is moved over a guide line the cursor gets updated.
*
* @param e TQMouseEvent
*
* @return true if the event was handled (guide moved, cursor changed as
* guide lies below)
* @return false otherwise
*/
bool mouseMoveEvent( TQMouseEvent *e );
/**
*
* @param e TQMouseEvent
*
* @return true if the event was handled
* @return false otherwise
*/
bool mouseReleaseEvent( TQMouseEvent *e );
/**
*
* @param e TQKeyEvent
*
* @return true if the event was handled
* @return false otherwise
*/
bool keyPressEvent( TQKeyEvent *e );
/**
* @brief Set the guide lines.
*
* This removes all existing guides and set up new ones at the positions given.
*
* @param horizontalPos A list of the position of the horizontal guide lines.
* @param verticalPos A list of the position of the vertical guide lines.
*/
void setGuideLines( const TQValueList<double> &horizontalPos, const TQValueList<double> &verticalPos );
/**
* @brief Set the positions for snapping of auto guide lines
*
* This removes all existing auto guide lines and set up new ones at the positions given.
*
* @param horizontalPos A list of the position of the horizontal guide lines.
* @param verticalPos A list of the position of the vertical guide lines.
*/
void setAutoGuideLines( const TQValueList<double> &horizontalPos, const TQValueList<double> &verticalPos );
/**
* @brief Get the position of the guide lines
*
* This filles the passed lists with the positions of the guide lines.
* The lists will be emptied before any positions are added.
*
* @param horizontalPos A list of the position of the horizontal guide lines.
* @param verticalPos A list of the position of the vertical guide lines.
*/
void getGuideLines( TQValueList<double> &horizontalPos, TQValueList<double> &verticalPos ) const;
/**
* @brief Snap rect to guidelines
*
* This looks for a guide which is in reach for the guide as defined in snap.
* This method has the abillity to combine more calls. The snapStatus and diff args are both input and
* output. On first call you should set snapStatus to 0. The return value would then show in which
* directions it has snapped. If you combine several KoGuides you can let these output arguments
* be input for the next koGuide. That way you'll always catch the nearest guide.
*
* @param rect the rect which should be snapped
* @param snap the distance within the guide should snap - but always snap if already snapped
* @param snapStatus if horiz,vert or both directions are snapped (both in and out param).
* @param diff distance away from guide. Only valid if status is snapping (both in and out param)
*/
void snapToGuideLines( KoRect &rect, int snap, SnapStatus &snapStatus, KoPoint &diff );
/**
* @brief Snap rect to guidelines
*
* This looks fo a guide which is in reach for the guide as defined in snap.
*
* @param pos the position which should be snapped
* @param snap the distance wherein the guide should snap - but always snap if already snapped
* @param snapStatus if horiz,vert or both directions are snapped (both in and out param)
* @param diff distance away from guide. Only valid if status is snapping (both in and out param)
*/
void snapToGuideLines( KoPoint &pos, int snap, SnapStatus &snapStatus, KoPoint &diff );
/**
* @brief repaint guides if any changed snapping status
*
* This issues a paint request if any guides have changed snapping status.
*
* @param snappedRect the rect after it has been snapped
*/
void repaintSnapping( const KoRect &snappedRect );
/**
* @brief repaint guides if any changed snapping status
*
* This issues a paint request if any guides have changed snapping status.
*
* @param snappedPoint the point after it has been snapped
*/
void repaintSnapping( const KoPoint &snappedPoint, SnapStatus snapStatus );
/**
* @brief repaint guides so none is snapped
*
* This issues a paint request if any guides have changed snapping status.
* It also effectively un-snaps all since it doesn't take an argument
*/
void repaintAfterSnapping( );
/**
* @brief Find the closesed disance to the next guide within the given distance
*
* @param rect The rect which should be snapped
* @param diff distance in which too look for the closesed guide. The parameter is updated
* with the closesed distance to a guide if one is found (both in and out param)
*/
void diffNextGuide( KoRect &rect, KoPoint &diff );
public slots:
/**
* @brief Move Guide
*
* This slot can be connected to void KoRuler::moveGuide( const TQPoint &, bool, int );
* It will add a new guide when you move from the ruler to the canvas. After that it
* moves the guide.
*
* @param pos The pos of the mouse
* @param horizontal true if the guide is horizontal, false if vertical
* @param rulerWidth The witdth of the ruler as the pos is seen from the ruler widget.
*/
void moveGuide( const TQPoint &pos, bool horizontal, int rulerWidth );
/**
* @brief Add Guide
*
* This slot can be connected to void KoRuler::addGuide( const TQPoint &, bool, int );
* It will finish the inserting of a guide from moveGuide().
*
* @param pos The pos of the mouse
* @param horizontal true if the guide is horizontal, false if vertical
* @param rulerWidth The witdth of the ruler as the pos is seen from the ruler widget.
*/
void addGuide( const TQPoint &pos, bool horizontal, int rulerWidth );
signals:
/**
* @brief Signal that shows that the guide lines are changed
*
* This signal is emmited when the guide lines are changed ( moved / deleted )
*
* @param view The view in which the guide lines are changed.
*/
void guideLinesChanged( KoView * view );
/**
* @brief This signal is emitted when guides start/stop moving.
*
* @param state true when starting moving guides, false when stopping.
*/
void moveGuides( bool state );
/**
* @brief This signal is emitted when guides start/stop painting.
*
* With this signal it is possible to only repaint the guides in the paint
* method of the canvas. Just set/unset a flag when this signal is emmited.
* This signal is emitted before and after a repaint is done.
*
* @param state true when starting painting guides, false when stopping.
*/
void paintGuides( bool state );
private slots:
/**
* @brief Execute a dialog to set the position of the guide
*/
void slotChangePosition();
/**
* @brief remove all selected guides
*/
void slotRemove();
private:
/// Strukt holding the data of a guide line
struct KoGuideLine
{
KoGuideLine( Qt::Orientation o, double pos, bool a = false )
: orientation( o )
, position( pos )
, selected( false )
, snapping( false )
, automatic( a )
{}
Qt::Orientation orientation;
double position;
bool selected; // if this guide is selected
bool snapping; // if this guide is being snapped to
bool automatic; // if this is a atomatic guide line
};
/**
* @brief Paint the canvas
*/
void paint();
/**
* @brief Add a guide line with the orientation o at the position pos
*
* @param pos where to insert the guide
* @param o orientation of the guide line
*/
void add( Qt::Orientation o, TQPoint &pos );
/**
* @brief Select a guide
*
* @param gd guide to select
*/
void select( KoGuideLine *guideLine );
/**
* @brief Unselect a guide
*
* @param gd guide to unselect
*/
void unselect( KoGuideLine *guideLine );
/**
* @brief Unselect all selected KoGuideLineData
*
* @return true, when selection was changed
* @return false otherwise
*/
bool unselectAll();
/**
* @brief remove all selected guides
*/
void removeSelected();
/**
* @brief Check if at least one guide is selected
*
* @return true if at least on guide is seleted
* @return false otherwise
*/
bool hasSelected();
/**
* @brief Find a guide
*
* This function looks for a guide at x or y pos. The position can differ by
* diff.
*
* @param x x position to look for a guide
* @param y y position to look for a guide
* @param diff how far next to a guide sould it also be found
*
* @return the fould guide
* @return 0 if none is found
*/
KoGuideLine * find( KoPoint &p, double diff );
/**
* @brief Move selected guides.
*
* This moves all selected guides around. If more than one guide is selected it makes
* sure the guides are not moved of the canvas.
*
* @param pos position of the mouse
*/
void moveSelectedBy( TQPoint &p );
/**
* @brief Map pos from screen
*
* @param pos on screen
*
* @return pos in document
*/
KoPoint mapFromScreen( const TQPoint & pos );
/**
* @brief Map pos to screen
*
* @param pos in document
*
* @return pos on screen
*/
TQPoint mapToScreen( const KoPoint & pos );
/**
* @brief Check if the both values are nearly the same.
*
* @param a first value
* @param a second value
*
* @return true if they are the same
* @return false otherwise
*/
bool virtuallyEqual( double a, double b ) { return TQABS( a - b ) < 1E-4; }
/// view
KoView * m_view;
/// zoom handler of the view
KoZoomHandler * m_zoomHandler;
enum GuideLineType
{
GL,
GL_SELECTED,
GL_AUTOMATIC,
GL_END
};
/// array of list of the different guide line types
TQValueList<KoGuideLine *> m_guideLines[GL_END];
/// used to save the last mouse position
TQPoint m_lastPoint;
/// true if a guide is selected at the moment
bool m_mouseSelected;
/// true if a guide is inserted at the moment
bool m_insertGuide;
/// popup menu
class Popup;
Popup * m_popup;
};
#endif /* KOGUIDES_H */