/*
    Rosegarden
    A MIDI and audio sequencer and musical notation editor.

    This program is Copyright 2000-2008
        Guillaume Laurent   <glaurent@telegraph-road.org>,
        Chris Cannam        <cannam@all-day-breakfast.com>,
        Richard Bown        <richard.bown@ferventsoftware.com>

    The moral rights of Guillaume Laurent, Chris Cannam, and Richard
    Bown to claim authorship of this work have been asserted.

    Other copyrights also apply to some parts of this work.  Please
    see the AUTHORS file and individual file headers for details.

    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.  See the file
    COPYING included with this distribution for more information.
*/

#ifndef _RG_COMPOSITIONVIEW_H_
#define _RG_COMPOSITIONVIEW_H_

#include "base/Selection.h"
#include "CompositionModel.h"
#include "CompositionItem.h"
#include "gui/general/RosegardenScrollView.h"
#include <tqbrush.h>
#include <tqcolor.h>
#include <tqpen.h>
#include <tqpixmap.h>
#include <tqpoint.h>
#include <tqrect.h>
#include <tqstring.h>
#include "base/Event.h"


class TQWidget;
class TQWheelEvent;
class TQResizeEvent;
class TQPaintEvent;
class TQPainter;
class TQMouseEvent;
class TQEvent;


namespace Rosegarden
{

class SnapGrid;
class SegmentToolBox;
class SegmentTool;
class SegmentSelector;
class Segment;
class RosegardenGUIDoc;
class CompositionRect;


class CompositionView : public RosegardenScrollView 
{
    Q_OBJECT
  
public:
    CompositionView(RosegardenGUIDoc*, CompositionModel*,
                    TQWidget * parent=0, const char* name=0, WFlags f=0);

    void setPointerPos(int pos);
    int getPointerPos() { return m_pointerPos; }

    void setGuidesPos(int x, int y);
    void setGuidesPos(const TQPoint& p);
    void setDrawGuides(bool d);

    TQRect getSelectionRect() const { return m_selectionRect; }
    void setSelectionRectPos(const TQPoint& pos);
    void setSelectionRectSize(int w, int h);
    void setDrawSelectionRect(bool d);

    SnapGrid& grid() { return m_model->grid(); }

    CompositionItem getFirstItemAt(TQPoint pos);

    SegmentToolBox* getToolBox() { return m_toolBox; }

    CompositionModel* getModel() { return m_model; }

    void setTmpRect(const TQRect& r);
    void setTmpRect(const TQRect& r, const TQColor &c);
    const TQRect& getTmpRect() const { return m_tmpRect; }

    /**
     * Set the snap resolution of the grid to something suitable.
     * 
     * fineTool indicates whether the current tool is a fine-grain sort
     * (such as the resize or move tools) or a coarse one (such as the
     * segment creation pencil).  If the user is requesting extra-fine
     * resolution (through the setFineGrain method) that will also be
     * taken into account.
     */
    void setSnapGrain(bool fine);

    /**
     * Find out whether the user is requesting extra-fine resolution
     * (e.g. by holding Shift key).  This is seldom necessary -- most
     * client code will only need to query the snap grid that is
     * adjusted appropriately by the view when interactions take
     * place.
     */
    bool isFineGrain() const { return m_fineGrain; }

    /**
     * Find out whether the user is requesting to draw over an existing segment
     * with the pencil, by holding the Ctrl key.  This is used by the segment
     * pencil to decide whether to abort or not if a user attempts to draw over
     * an existing segment, and this is all necessary in order to avoid breaking
     * the double-click-to-open behavior.
     */
    bool pencilOverExisting() const { return m_pencilOverExisting; }

    /**
     * Set whether the segment items contain previews or not
     */
    void setShowPreviews(bool previews) { m_showPreviews = previews; }

    /**
     * Return whether the segment items contain previews or not
     */
    bool isShowingPreviews() { return m_showPreviews; }

    /**
     * clear all seg rect cache
     */
    void clearSegmentRectsCache(bool clearPreviews = false);

    /// Return the selected Segments if we're currently using a "Selector"
    SegmentSelection getSelectedSegments();

    bool haveSelection() const { return m_model->haveSelection(); }

    void updateSelectionContents();

    /**
     * Set and hide a text float on this canvas - it can contain
     * anything and can be left to timeout or you can hide it
     * explicitly.
     *
     */
    void setTextFloat(int x, int y, const TQString &text);
    void hideTextFloat() { m_drawTextFloat = false; }

    void setShowSegmentLabels(bool b) { m_showSegmentLabels = b; }

    void setBackgroundPixmap(const TQPixmap &m);

    void endAudioPreviewGeneration();

public slots:
    void scrollRight();
    void scrollLeft();
    void slotContentsMoving(int x, int y);

    /// Set the current segment editing tool
    void slotSetTool(const TQString& toolName);

    // This method only operates if we're of the "Selector"
    // tool type - it's called from the View to enable it
    // to automatically set the selection of Segments (say
    // by Track).
    //
    void slotSelectSegments(const SegmentSelection &segment);

    // These are sent from the top level app when it gets key
    // depresses relating to selection add (usually SHIFT) and
    // selection copy (usually CONTROL)
    //
    void slotSetSelectAdd(bool value);
    void slotSetSelectCopy(bool value);

    void slotSetFineGrain(bool value);
    void slotSetPencilOverExisting(bool value);

    // Show and hige the splitting line on a Segment
    //
    void slotShowSplitLine(int x, int y);
    void slotHideSplitLine();

    void slotExternalWheelEvent(TQWheelEvent*);

    // TextFloat timer
    void slotTextFloatTimeout();

    void slotUpdateSegmentsDrawBuffer();
    void slotUpdateSegmentsDrawBuffer(const TQRect&);

    void slotRefreshColourCache();

    void slotNewMIDIRecordingSegment(Segment*);
    void slotNewAudioRecordingSegment(Segment*);
    // no longer used, see RosegardenGUIDoc::insertRecordedMidi
//     void slotRecordMIDISegmentUpdated(Segment*, timeT updatedFrom);
    void slotStoppedRecording();

    void slotUpdateSize();

signals:
    void editSegment(Segment*); // use default editor
    void editSegmentNotation(Segment*);
    void editSegmentMatrix(Segment*);
    void editSegmentAudio(Segment*);
    void editSegmentEventList(Segment*);
    void audioSegmentAutoSplit(Segment*);
    void editRepeat(Segment*, timeT);

    void setPointerPosition(timeT);

    void showContextHelp(const TQString &);

protected:
    virtual bool event(TQEvent *);

    virtual void contentsMousePressEvent(TQMouseEvent*);
    virtual void contentsMouseReleaseEvent(TQMouseEvent*);
    virtual void contentsMouseDoubleClickEvent(TQMouseEvent*);
    virtual void contentsMouseMoveEvent(TQMouseEvent*);

    virtual void viewportPaintEvent(TQPaintEvent*);
    virtual void resizeEvent(TQResizeEvent*);

    virtual void enterEvent(TQEvent *);
    virtual void leaveEvent(TQEvent *);

    virtual void viewportPaintRect(TQRect);
    
    /**
     * if something changed, returns true and sets rect accordingly
     * sets 'scroll' if some scrolling occurred
     */
    bool checkScrollAndRefreshDrawBuffer(TQRect &, bool& scroll);
    void refreshSegmentsDrawBuffer(const TQRect&);
    void refreshArtifactsDrawBuffer(const TQRect&);
    void drawArea(TQPainter * p, const TQRect& rect);
    void drawAreaAudioPreviews(TQPainter * p, const TQRect& rect);
    void drawAreaArtifacts(TQPainter * p, const TQRect& rect);
    void drawRect(const TQRect& rect, TQPainter * p, const TQRect& clipRect,
                  bool isSelected = false, int intersectLvl = 0, bool fill = true);
    void drawCompRect(const CompositionRect& r, TQPainter *p, const TQRect& clipRect,
                      int intersectLvl = 0, bool fill = true);
    void drawCompRectLabel(const CompositionRect& r, TQPainter *p, const TQRect& clipRect);
    void drawIntersections(const CompositionModel::rectcontainer&, TQPainter * p, const TQRect& clipRect);

    void drawPointer(TQPainter * p, const TQRect& clipRect);
    void drawGuides(TQPainter * p, const TQRect& clipRect);
    void drawTextFloat(TQPainter * p, const TQRect& clipRect);

    void initStepSize();
    void releaseCurrentItem();

    static TQColor mixBrushes(TQBrush a, TQBrush b);

    SegmentSelector* getSegmentSelectorTool();

protected slots:
    void slotSegmentsDrawBufferNeedsRefresh() {
        m_segmentsDrawBufferRefresh =
            TQRect(contentsX(), contentsY(), visibleWidth(), visibleHeight());
    }

    void slotSegmentsDrawBufferNeedsRefresh(TQRect r) {
        m_segmentsDrawBufferRefresh |=
            (TQRect(contentsX(), contentsY(), visibleWidth(), visibleHeight())
             & r);
    }

    void slotArtifactsDrawBufferNeedsRefresh() {
        m_artifactsDrawBufferRefresh = 
            TQRect(contentsX(), contentsY(), visibleWidth(), visibleHeight());
        updateContents();
    }

    void slotArtifactsDrawBufferNeedsRefresh(TQRect r) {
        m_artifactsDrawBufferRefresh |=
            (TQRect(contentsX(), contentsY(), visibleWidth(), visibleHeight())
             & r);
        updateContents(r);
    }

    void slotAllDrawBuffersNeedRefresh() {
        slotSegmentsDrawBufferNeedsRefresh();
        slotArtifactsDrawBufferNeedsRefresh();
    }

    void slotAllDrawBuffersNeedRefresh(TQRect r) {
        slotSegmentsDrawBufferNeedsRefresh(r);
        slotArtifactsDrawBufferNeedsRefresh(r);
    }

    void slotToolHelpChanged(const TQString &);

protected:         

    //--------------- Data members ---------------------------------

    CompositionModel* m_model;
    CompositionItem m_currentItem;

    SegmentTool*    m_tool;
    SegmentToolBox* m_toolBox;

    bool         m_showPreviews;
    bool         m_showSegmentLabels;
    bool         m_fineGrain;
    bool         m_pencilOverExisting;

    int          m_minWidth;

    int          m_stepSize;
    TQColor       m_rectFill;
    TQColor       m_selectedRectFill;

    int          m_pointerPos;
    TQColor       m_pointerColor;
    int          m_pointerWidth;
    TQPen         m_pointerPen;

    TQRect        m_tmpRect;
    TQColor       m_tmpRectFill;
    TQPoint       m_splitLinePos;

    TQColor       m_trackDividerColor;

    bool         m_drawGuides;
    TQColor       m_guideColor;
    int          m_topGuidePos;
    int          m_foreGuidePos;

    bool         m_drawSelectionRect;
    TQRect        m_selectionRect;

    bool         m_drawTextFloat;
    TQString      m_textFloatText;
    TQPoint       m_textFloatPos;

    TQPixmap      m_segmentsDrawBuffer;
    TQPixmap      m_artifactsDrawBuffer;
    TQRect        m_segmentsDrawBufferRefresh;
    TQRect        m_artifactsDrawBufferRefresh;
    int          m_lastBufferRefreshX;
    int          m_lastBufferRefreshY;
    int          m_lastPointerRefreshX;
    TQPixmap      m_backgroundPixmap;

    TQString      m_toolContextHelp;
    bool         m_contextHelpShown;

    mutable CompositionModel::AudioPreviewDrawData m_audioPreviewRects;
    mutable CompositionModel::RectRanges m_notationPreviewRects;
};


}

#endif