rowdragpl.cpp

wxGTK 是 wxWidgets 的 linux GTK+ (>2.2.3)版本。wxWidgets 是一个跨平台的 GUI 框架

/////////////////////////////////////////////////////////////////////////////
// Name:        rowdragpl.cpp
// Purpose:     cbRowDragPlugin implementation.
// Author:      Aleksandras Gluchovas
// Modified by:
// Created:     06/10/98
// RCS-ID:      $Id: rowdragpl.cpp,v 1.9 2006/04/26 16:27:18 PC Exp $
// Copyright:   (c) Aleksandras Gluchovas
// Licence:     wxWindows licence
/////////////////////////////////////////////////////////////////////////////

// For compilers that support precompilation, includes "wx.h".
#include "wx/wxprec.h"

#ifdef __BORLANDC__
#pragma hdrstop
#endif

#ifndef WX_PRECOMP
#include "wx/wx.h"
#endif

#include "wx/fl/rowdragpl.h"

#define MINIMAL_ROW_DRAG_OFS  5

// parameters for row-hints of NC-look

#define TRIANGLE_OFFSET       2
#define TRIANGLE_TO_PAT_GAP   2
#define PAT_OFFSET            2
#define COLLAPSED_ICON_WIDTH  45
#define COLLAPSED_ICON_HEIGHT 9
#define ROW_DRAG_HINT_WIDTH   10
#define ICON_TRIAN_WIDTH      6
#define ICON_TRIAN_HEIGHT     3

/***** Implementation for class cbHiddenBarInfo *****/

IMPLEMENT_DYNAMIC_CLASS( cbHiddenBarInfo, wxObject )

/***** Implementation for class cbRowDragPlugin *****/

IMPLEMENT_DYNAMIC_CLASS( cbRowDragPlugin, cbPluginBase )

BEGIN_EVENT_TABLE( cbRowDragPlugin, cbPluginBase )

    EVT_PL_LEFT_DOWN          ( cbRowDragPlugin::OnLButtonDown        )
    EVT_PL_LEFT_UP              ( cbRowDragPlugin::OnLButtonUp          )
    EVT_PL_MOTION              ( cbRowDragPlugin::OnMouseMove          )

    EVT_PL_DRAW_PANE_DECOR    ( cbRowDragPlugin::OnDrawPaneBackground )

END_EVENT_TABLE()

// FIXME:: how to eliminated these cut and pasted constructors?

cbRowDragPlugin::cbRowDragPlugin(void)

    : mHightColor          ( 192, 192, 255 ),
      mLowColor            ( 192, 192, 192 ),
      mTrianInnerColor     ( 0,0,255 ),
      mTrianInnerPen       ( mTrianInnerColor, 1, wxSOLID ),
 
      mDragStarted         ( false ),
      mDecisionMode        ( false ),
      mCurDragOfs          ( 0 ),
      mCaptureIsOn         ( false ),
      mSvTopMargin         ( -1 ),
      mSvBottomMargin      ( -1 ),
      mSvLeftMargin        ( -1 ),
      mSvRightMargin       ( -1 ),
   
      mpPaneImage          ( NULL ),
      mpRowImage           ( NULL ),
      mpCombinedImage        ( NULL ),

      mpRowInFocus         ( NULL ),
      mCollapsedIconInFocus( -1 ),
      
      mpPane               ( NULL )
{
}

cbRowDragPlugin::cbRowDragPlugin( wxFrameLayout* pLayout, int paneMask )

    : cbPluginBase( pLayout, paneMask ),
      
         mHightColor          ( 192, 192, 255 ),
      mLowColor            ( 192, 192, 192 ),
      mTrianInnerColor     ( 0,0,255 ),
      mTrianInnerPen       ( mTrianInnerColor, 1, wxSOLID ),
   
      mDragStarted         ( false ),
      mDecisionMode        ( false ),
      mCurDragOfs          ( 0 ),
      mCaptureIsOn         ( false ),
      mSvTopMargin         ( -1 ),
      mSvBottomMargin      ( -1 ),
      mSvLeftMargin        ( -1 ),
      mSvRightMargin       ( -1 ),
      
      mpPaneImage          ( NULL ),
      mpRowImage           ( NULL ),
      mpCombinedImage        ( NULL ),

      mpRowInFocus         ( NULL ),
      mCollapsedIconInFocus( -1 ),
      
      mpPane               ( NULL )
{
}

cbRowDragPlugin::~cbRowDragPlugin()
{
}

// handlers for plugin events
void cbRowDragPlugin::OnMouseMove( cbMotionEvent& event )
{
    // short-cuts
    wxPoint pos = event.mPos;
    mpPane      = event.mpPane;

    mpPane->PaneToFrame( &pos.x, &pos.y );

    if ( !mDragStarted )
    {
        if ( mDecisionMode && mpRowInFocus )
        {
            int ofs;

            if ( mpPane->IsHorizontal() )

                ofs = pos.y - mDragOrigin.y;
            else
                ofs = pos.x - mDragOrigin.x;

            // check if the item was dragged sufficeintly
            // far, enough to consider that user really intends 
            // to drag it

            if ( ofs >= MINIMAL_ROW_DRAG_OFS ||
                 ofs <= -MINIMAL_ROW_DRAG_OFS )
            {
                // DBG::
                //.wxPoint pos = event.mPos;
                //wxPoint drg = mDragOrigin;
                //int dif = event.mPos.x - mDragOrigin.x;

                mDragStarted  = true;
                mDecisionMode = false;
                mDragOrigin   = pos;

                PrepareForRowDrag();
                return;
            }

            // this plugin "eats" all mouse input while item is dragged,
            return;
        }

        cbRowInfo* pRow = GetFirstRow();

        bool focusFound = false;

        while( pRow )
        {
            if ( HitTestRowDragHint( pRow, pos ) )
            {
                CheckPrevItemInFocus( pRow, -1 );
                SetMouseCapture( true );

                focusFound = true;

                mpRowInFocus          = pRow;
                mCollapsedIconInFocus = -1;
                break;
            }

            pRow = pRow->mpNext;
        }

        if ( !focusFound )
        {
            int hrCnt = GetHRowsCountForPane( event.mpPane );

            for( int i = 0; i != hrCnt; ++i )
            {
                if ( HitTestCollapsedRowIcon( i, pos ) )
                {
                    CheckPrevItemInFocus( NULL, i );
                    SetMouseCapture( true );

                    focusFound = true;

                    mCollapsedIconInFocus = i;
                    mpRowInFocus          = NULL;
                    break;
                }
            }
        }

        if ( !focusFound && ItemIsInFocus() )
        {
            // kill focus from item previously been in focus
            UnhighlightItemInFocus();

            mpRowInFocus          = NULL;
            mCollapsedIconInFocus = -1;
            SetMouseCapture( false );
        }

        if ( !ItemIsInFocus() ) 

                // delegate it to other plugins
                event.Skip();
    }
    else
    {
        // otherwise mouse pointer moves, when dragging is started

        if ( mpPane->IsHorizontal() )
        {
            // row is dragged up or down;
            ShowDraggedRow( pos.y - mDragOrigin.y );
        }
        else
        {
            // row is dragged left or right
            ShowDraggedRow( pos.x - mDragOrigin.x );
        }

        // this plugin "eats" all mouse input while item is dragged,
    }
}

void cbRowDragPlugin::OnLButtonDown( cbLeftDownEvent& event )
{
    mpPane = event.mpPane;

    // DBG::
    wxASSERT( !mDragStarted && !mDecisionMode );

    if ( ItemIsInFocus() )
    {
        mDecisionMode = true;

        wxPoint pos = event.mPos;
        mpPane->PaneToFrame( &pos.x, &pos.y );

        mDragOrigin = pos;

        SetMouseCapture( true );
    }
    else
        // propagate event to other plugins
        event.Skip();
}

void cbRowDragPlugin::OnLButtonUp  ( cbLeftUpEvent& event )
{
    if ( !mDragStarted && !mDecisionMode ) 
    {
        event.Skip();
        return;
    }

    mpPane = event.mpPane;

    if ( mDecisionMode )
    {
        cbDockPane* pPane = mpPane;

        SetMouseCapture( false );

        mDecisionMode = false;
        mDragStarted  = false;

        wxPoint frmPos = event.mPos;
        pPane->PaneToFrame( &frmPos.x, &frmPos.y );

        if ( mpRowInFocus ) 
        {
            CollapseRow( mpRowInFocus );
            mpRowInFocus = 0;
        }
        else
        {
            ExpandRow( mCollapsedIconInFocus );
            mCollapsedIconInFocus = -1;
        }

        mpRowInFocus  = NULL;
        mpPane = pPane;

        pPane->FrameToPane( &frmPos.x, &frmPos.y );

        // give it another try after relayouting bars

        cbMotionEvent moveEvt( frmPos, pPane );
        this->OnMouseMove( moveEvt );

        // this plugin has "eaten" the mouse-up event

        return;
    }
    else
    {
        // otherwise, the dragged row was dropped, determine
        // where to insert it

        // restore initial pane appearence
        ShowPaneImage();
        FinishOnScreenDraw();

        cbRowInfo* pRow = GetFirstRow();

        mpLayout->GetUpdatesManager().OnStartChanges();

        pRow->mUMgrData.SetDirty(true);

        cbBarInfo* pBar = mpRowInFocus->mBars[0];

        while ( pBar )
        {
            pBar->mUMgrData.SetDirty(true);

            if ( pBar->mpBarWnd )
            {
                // do complete refresh
                pBar->mpBarWnd->Show(false);
                pBar->mpBarWnd->Show(true);
            }

            pBar = pBar->mpNext;
        }

        while( pRow )
        {
            if ( mCurDragOfs < pRow->mRowY )
            {
                InsertDraggedRowBefore( pRow );
                break;
            }

            pRow = pRow->mpNext;
        }

        if ( pRow == NULL ) InsertDraggedRowBefore( NULL );

        mpRowInFocus = NULL;

        mpLayout->RecalcLayout(false);

        // finish change "transaction"
        mpLayout->GetUpdatesManager().OnFinishChanges();
        mpLayout->GetUpdatesManager().UpdateNow();

        // finish drag action
        SetMouseCapture( false );
        mDragStarted = false;
    }
}

void cbRowDragPlugin::OnDrawPaneBackground ( cbDrawPaneDecorEvent& event )
{
    mpPane = event.mpPane;

    // FIXME:: this may harm operation of other plugins

    if ( GetNextHandler() && mpPane->GetRowList().GetCount() )
    {
        // first, let other plugins add their decorations now
    
        GetNextHandler()->ProcessEvent( event );
        event.Skip(false);
    }

    wxClientDC dc( &mpLayout->GetParentFrame() );

    dc.SetClippingRegion( mpPane->mBoundsInParent.x,
                          mpPane->mBoundsInParent.y,
                          mpPane->mBoundsInParent.width,
                          mpPane->mBoundsInParent.height );

    int cnt = GetHRowsCountForPane( event.mpPane );

    if ( cnt > 0 ) 

        DrawCollapsedRowsBorder( dc );

    if ( mpPane->GetRowList().GetCount() )
    
        DrawRowsDragHintsBorder( dc );

    cbRowInfo* pRow = GetFirstRow();

    while( pRow )
    {
        DrawRowDragHint( pRow, dc, false );
        pRow = pRow->mpNext;
    }

    for( int i = 0; i != cnt; ++i )

        DrawCollapsedRowIcon(i, dc, false );
}

int cbRowDragPlugin::GetHRowsCountForPane( cbDockPane* pPane )
{
    wxNode* pNode = mHiddenBars.GetFirst();

    int maxIconNo = -1;

    while( pNode )
    {
        cbHiddenBarInfo* pHBInfo = (cbHiddenBarInfo*)pNode->GetData();

        if ( pHBInfo->mAlignment == pPane->mAlignment )

            maxIconNo = wxMax( maxIconNo, pHBInfo->mIconNo );

        pNode = pNode->GetNext();
    }

    return ( maxIconNo + 1 );
}

int cbRowDragPlugin::GetCollapsedRowIconHeight()
{
    return COLLAPSED_ICON_HEIGHT;
}

int cbRowDragPlugin::GetRowDragHintWidth()
{
    return ROW_DRAG_HINT_WIDTH;
}

void cbRowDragPlugin::SetPaneMargins()
{
    int hiddenRowsCnt = GetHRowsCountForPane( mpPane );

    if ( mSvTopMargin == -1 )
    {
        mSvTopMargin    = mpPane->mTopMargin;
        mSvBottomMargin    = mpPane->mBottomMargin;
        mSvLeftMargin   = mpPane->mLeftMargin;
        mSvRightMargin  = mpPane->mRightMargin;
    }

    if ( mpPane->IsHorizontal() )
    {
        mpPane->mTopMargin    = mSvTopMargin;
        mpPane->mBottomMargin = ( hiddenRowsCnt == 0 ) 
                                ?  mSvBottomMargin 
                                :  mSvBottomMargin + GetCollapsedRowIconHeight();

        mpPane->mLeftMargin   = mSvLeftMargin + GetRowDragHintWidth();
        mpPane->mRightMargin  = mSvRightMargin;
    }
    else
    {
        mpPane->mTopMargin    = mSvTopMargin;
        mpPane->mBottomMargin = mSvBottomMargin + GetRowDragHintWidth();

        mpPane->mLeftMargin   = mSvLeftMargin;
        mpPane->mRightMargin  = ( hiddenRowsCnt == 0 ) ?
                                mSvRightMargin : mSvRightMargin + GetCollapsedRowIconHeight();
    }
}

void cbRowDragPlugin::OnInitPlugin()
{
    cbDockPane** panes = mpLayout->GetPanesArray();

    for( int i = 0; i != MAX_PANES; ++i )

        if ( panes[i]->MatchesMask( mPaneMask ) )
        {
            mpPane = panes[i];

            SetPaneMargins();
        }