rowlayoutpl.cpp

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

    return maxHeight;
}

void cbRowLayoutPlugin::StickRightSideBars( cbBarInfo* pToBar )
{
    cbBarInfo* pBar  = pToBar->mpNext;
    cbBarInfo* pPrev = pToBar;

    while( pBar )
    {
        wxRect& cur  = pBar->mBounds;
        wxRect& prev = pPrev->mBounds;

        cur.x = prev.x + prev.width;

        pPrev = pBar;
        pBar  = pBar->mpNext;
    }
}

void cbRowLayoutPlugin::SlideLeftSideBars( cbBarInfo* pTheBar )
{
    // shift left-side-bars to the left (with respect to "theBar"),
    // so that they would not obscured by each other

    cbBarInfo* pBar  = pTheBar->mpPrev;
    cbBarInfo* pPrev = pTheBar;

    while( pBar )
    {
        wxRect& cur  = pBar->mBounds;
        wxRect& prev = pPrev->mBounds;

        if ( cur.x + cur.width > prev.x )

            cur.x = prev.x - cur.width;

        pPrev = pBar;
        pBar  = pBar->mpPrev;
    }
}

void cbRowLayoutPlugin::SlideRightSideBars( cbBarInfo* pTheBar )
{
    // shift right-side-bars to the right (with respect to "theBar"),
    // so that they would not be obscured by each other

    cbBarInfo* pBar  = pTheBar->mpNext;
    cbBarInfo* pPrev = pTheBar;

    while( pBar )
    {
        wxRect& cur  = pBar->mBounds;
        wxRect& prev = pPrev->mBounds;

        if ( cur.x < prev.x + prev.width )

            cur.x = prev.x + prev.width;

        pPrev = pBar;
        pBar  = pBar->mpNext;
    }
}

void cbRowLayoutPlugin::ShiftLeftTrashold( cbBarInfo* WXUNUSED(pTheBar), cbRowInfo& row )
{
    wxRect& first = row.mBars[0]->mBounds;

    if ( first.x < 0 )
    {
        row.mBars[0]->mBounds.x = 0;

        SlideRightSideBars( row.mBars[0] );
    }
}

void cbRowLayoutPlugin::ShiftRightTrashold( cbBarInfo* pTheBar, cbRowInfo& row )
{
    wxRect& theBar = pTheBar->mBounds;

    do
    {
        cbBarInfo* pBar = pTheBar;

        // calculate free spece on the left side

        int leftFreeSpc = 0;

        while( pBar )
        {
            wxRect& cur = pBar->mBounds;

            if ( pBar->mpPrev )
            {
                wxRect& prev = pBar->mpPrev->mBounds;

                leftFreeSpc += cur.x - prev.x - prev.width;
            }
            else
                leftFreeSpc += cur.x;

            if ( cur.x < 0 )
            {
                leftFreeSpc = 0;
                break;
            }

            pBar = pBar->mpPrev;
        }

        pBar = pTheBar;

        int rightOverflow = 0;

        if ( pTheBar->IsFixed() )

            while( pBar )
            {
                if ( !pBar->mpNext )
                {
                    wxRect& cur = pBar->mBounds;

                    if ( cur.x + cur.width > mpPane->mPaneWidth )

                        rightOverflow = cur.x + cur.width - mpPane->mPaneWidth;
                }

                pBar = pBar->mpNext;
            }

        if ( rightOverflow > 0 )
        {
            if ( leftFreeSpc <= 0 ) return;

            if ( pTheBar->mpNext )
            {
                wxRect& next = pTheBar->mpNext->mBounds;

                // if there's enough space on the left, move over one half-obscured
                // bar from the right to the left side with respect to "theBar"

                if ( next.width < leftFreeSpc )
                {
                    cbBarInfo* pNext = pTheBar->mpNext;

                    row.mBars.Remove( pNext );

                    row.mBars.Insert( pNext, row.mBars.Index( pTheBar ) );

                    next.x = theBar.x - next.width;

                    // re-setup mpPrev/mpNext references after insertion

                    mpPane->InitLinksForRow( &row );

                    // tighten things

                    StickRightSideBars( pTheBar );
                    SlideLeftSideBars ( pTheBar );

                    continue;
                }
            }

            int leftShift = ( rightOverflow > leftFreeSpc )
                            ? leftFreeSpc
                            : rightOverflow;

            theBar.x -= leftShift;

            StickRightSideBars( pTheBar );
            SlideLeftSideBars ( pTheBar );

            break;

        } // end of if ( rightOverflow )
        else
            break;

    } while(1);
}

void cbRowLayoutPlugin::InsertBefore( cbBarInfo* pBeforeBar,
                                      cbBarInfo* pTheBar,
                                      cbRowInfo& row        )
{
    if ( pBeforeBar )

        row.mBars.Insert( pTheBar, row.mBars.Index( pBeforeBar ) );
    else
        row.mBars.Add( pTheBar );

    pTheBar->mpRow = &row;
}

void cbRowLayoutPlugin::DoInsertBar( cbBarInfo* pTheBar, cbRowInfo& row )
{
    wxRect& theBar = pTheBar->mBounds;

    /* OLD STUFF::
    if ( theBar.x < 0 && !node_to_bar( pTheBar ).IsFixed() )
    {
        // AI::
        theBar.width += theBar.x;
        theBar.x = 0;
    } */

    size_t i;
    for ( i = 0; i != row.mBars.Count(); ++i )
    {
        cbBarInfo& bar = *row.mBars[i];

        wxRect& cur = bar.mBounds;

        // if bar hits the left edge
        if ( theBar.x <= cur.x )
        {
            InsertBefore( &bar, pTheBar, row );
            return;
        }

        else
        // if bar hits the right edge
        if ( theBar.x <= cur.x + cur.width )
        {
            if ( theBar.x + theBar.width > cur.x + cur.width )
            {
                InsertBefore( bar.mpNext, pTheBar, row );
                return;
            }

            // otherwise the bar lies within the bounds of current bar

            int leftDist  = theBar.x - cur.x;
            int rightDist = cur.x + cur.width - (theBar.x + theBar.width);

            if ( leftDist < rightDist )

                InsertBefore( &bar, pTheBar, row );
            else
                InsertBefore( bar.mpNext, pTheBar, row );

            return;
        }
    }

    InsertBefore( NULL, pTheBar, row ); // insert at the end
}

// evnet handlers

void cbRowLayoutPlugin::OnInsertBar( cbInsertBarEvent& event )
{
    cbBarInfo* pBarToInsert = event.mpBar;
    cbRowInfo* pIntoRow     = event.mpRow;
    mpPane                  = event.mpPane;

    if ( !pBarToInsert->IsFixed() )

        AdjustLengthOfInserted( pIntoRow, pBarToInsert );

    DoInsertBar( pBarToInsert, *pIntoRow );

    mpPane->InitLinksForRow( pIntoRow ); // relink "mpNext/mpPrev"s

    // perform relayouting of the bars after insertion

    // init bar location info
    pBarToInsert->mAlignment = event.mpPane->mAlignment;
    pBarToInsert->mRowNo     = event.mpPane->GetRowIndex( pIntoRow );

#ifdef __EXPERIMENTAL

    if ( !pIntoRow->mHasOnlyFixedBars || !pBarToInsert->IsFixed() )

        RecalcLengthRatios( pIntoRow );

#endif

    MinimzeNotFixedBars( pIntoRow, pBarToInsert );

    SlideLeftSideBars ( pBarToInsert );
    SlideRightSideBars( pBarToInsert );

    ShiftLeftTrashold ( pBarToInsert, *pIntoRow );
    ShiftRightTrashold( pBarToInsert, *pIntoRow );

    mpPane->SyncRowFlags( pIntoRow );

    CheckIfAtTheBoundary( pBarToInsert, *pIntoRow );

    if ( event.mpPane->IsHorizontal() )

        pBarToInsert->mState = wxCBAR_DOCKED_HORIZONTALLY;
    else
        pBarToInsert->mState = wxCBAR_DOCKED_VERTICALLY;

    if ( !pIntoRow->mHasOnlyFixedBars )
    {

#ifdef __EXPERIMENTAL

        ExpandNotFixedBars( pIntoRow );
#else

        RelayoutNotFixedBarsAround( pBarToInsert, pIntoRow );
        RecalcLengthRatios( pIntoRow );

#endif

        DetectBarHandles( pIntoRow );

        // do proportional resizing of not-fixed bars
        ApplyLengthRatios( pIntoRow );
    }

    // adjust the bar's docking state

    // a little bit of AI:
    // memorize bar's height and width, when docked in
    // the current orientation - by making the current
    // dimensions to be "preferred" ones for this docking state

    if ( !pBarToInsert->IsFixed() )
    {
        cbBarInfo& bar = *pBarToInsert;

        bar.mDimInfo.mSizes[ bar.mState ].x = bar.mBounds.width;
        bar.mDimInfo.mSizes[ bar.mState ].y = bar.mBounds.height;
    }
}

void cbRowLayoutPlugin::OnRemoveBar ( cbRemoveBarEvent& event )
{
    cbBarInfo* pBar = event.mpBar;
    mpPane          = event.mpPane;

    cbRowInfo* pRow = pBar->mpRow;

    mpLayout->GetUpdatesManager().OnBarWillChange( pBar, pRow, event.mpPane );

    // invalidate the whole row
    //pFirst->mpRowInfo->mMgrData.mPrevBounds.x = -1;

    pRow->mBars.Remove( pBar );

    // rest bar information after removing it from the row
    pBar->mpRow           = NULL;
    pBar->mHasLeftHandle  = false;
    pBar->mHasRightHandle = false;

    mpPane->InitLinksForRow( pRow ); // relink "mpNext/mpPrev"s

    if ( pRow->mBars.Count() == 0 )
    {
        // empty rows should not exist

        event.mpPane->GetRowList().Remove( pRow );

        delete pRow;

        mpPane->InitLinksForRows();
    }
    else
    {
        // force repainting of bars, in the row, from which the bar was removed

        // FIXME:: really needed?
        pRow->mBars[0]->mUMgrData.SetDirty(true);

        // re-setup mHasOnlyFixedBars flag for the row information
        event.mpPane->SyncRowFlags( pRow );

        DetectBarHandles( pRow );

        if ( !pRow->mHasOnlyFixedBars )

            ExpandNotFixedBars( pRow );
    }
}

void cbRowLayoutPlugin::OnLayoutRow( cbLayoutRowEvent& event )
{
    cbRowInfo* pRow = event.mpRow;
    mpPane          = event.mpPane;

    MinimzeNotFixedBars( pRow, NULL );

    if ( !pRow->mHasOnlyFixedBars )
    {
        // do proportional resizing of not-fixed bars
        ApplyLengthRatios( pRow );
    }

    cbBarInfo& lastBar  = *pRow->mBars[ pRow->mBars.Count() - 1 ];
    cbBarInfo& firstBar = *pRow->mBars[ 0 ];

    // FIXME:: Next line not used
    // wxRect& bounds = lastBar.mBounds;

    if ( lastBar.mBounds.x + lastBar.mBounds.width > mpPane->mPaneWidth )
    {
        lastBar.mBounds.x = mpPane->mPaneWidth - lastBar.mBounds.width;

        // first simulate left-row-edge friction

        SlideLeftSideBars( &lastBar );

        if ( firstBar.mBounds.x < 0 )
            firstBar.mBounds.x = 0;

        // then left-row-edge function, though this
        // may cause some of the right-side bars going
        // out of row bounds, but left-side always
        // has the highest "priority"

        SlideRightSideBars( &firstBar );
    }

    event.Skip(); // pass event to the next handler
}

void cbRowLayoutPlugin::OnLayoutRows( cbLayoutRowsEvent& event )
{
    mpPane       = event.mpPane;

    int curY = 0;

    // FIXME:: Next line not used.
    // RowArrayT& arr = mpPane->GetRowList();

    size_t i;
    for ( i = 0; i != mpPane->GetRowList().Count(); ++i )
    {
        cbRowInfo& row = *mpPane->GetRowList()[ i ];
        //mpPane->CalcLengthRatios(& row);

        // setup "has-handle" flags for rows, which depend on the existence
        // of not-fixed bars in the row

        if ( !row.mHasOnlyFixedBars )
        {
            if ( mpPane->mAlignment == FL_ALIGN_TOP ||
                 mpPane->mAlignment == FL_ALIGN_LEFT   )
            {
                row.mHasLowerHandle = true;

                row.mHasUpperHandle = false;
            }
            else
            {
                row.mHasUpperHandle = true;

                row.mHasLowerHandle = false;
            }
        }
        else
        {
            // otherwise, rows with fixed-bars only, have no height-resizing handles
            row.mHasUpperHandle = false;
            row.mHasLowerHandle = false;
        }

        // setup vertical positions for items in the row

        row.mRowY = curY;

        row.mRowWidth  = mpPane->mPaneWidth;
        row.mRowHeight = CalcRowHeight( row );

        LayoutItemsVertically( row );

        if ( row.mHasUpperHandle )
            row.mRowHeight += mpPane->mProps.mResizeHandleSize;
        if ( row.mHasLowerHandle )
            row.mRowHeight += mpPane->mProps.mResizeHandleSize;

        curY += row.mRowHeight;
    }

    event.Skip(); // pass event to the next handler - other hookeds plugin
                  // may also add some "refinements" to the layout now
}

void cbRowLayoutPlugin::OnResizeRow( cbResizeRowEvent& event )
{
    // extract resize-event info
    int     ofs            = event.mHandleOfs;
    bool    forUpperHandle = event.mForUpperHandle;
    cbRowInfo* pTheRow     = event.mpRow;
            mpPane         = event.mpPane;

    // FIXME:: Next line not used.
    //int     newHeight      = pTheRow->mRowHeight;

    if ( forUpperHandle )
    {
        // calculate available free space from above,
        // which can be obtained by squeezing not-fixed height rows

        cbRowInfo* pRow = pTheRow->mpPrev;

        while( pRow )
        {
            pRow = pRow->mpPrev;
        }
    }
    else
    {
        // calculate available free space from below,
        // which can be obtained by squeezing not-fixed height rows

        cbRowInfo* pRow = pTheRow->mpNext;

        while( pRow )
        {
            pRow = pRow->mpNext;
        }
    }

    mpLayout->GetUpdatesManager().OnStartChanges();

    int clientSize;

    // allow user adjusting pane vs. client-area space, for upper-handle

    if ( mpPane->IsHorizontal() )

        clientSize = mpLayout->GetClientHeight();
    else
        clientSize = mpLayout->GetClientWidth();

    if ( forUpperHandle && ofs < -clientSize )
    {
        int needed = -(ofs + clientSize);

        cbRowInfo* pRow = mpPane->GetRowList()[ 0 ];

        // start squeezing rows from the top row towards bottom

        while( pRow != pTheRow && needed )
        {
            // only not-fixed rows can be squeezed

            if ( !pRow->mHasOnlyFixedBars )
            {
                int prevHeight = pRow->mRowHeight;

                int newHeight  = wxMax( event.mpPane->GetMinimalRowHeight( pRow ),
                                        prevHeight - needed );

                if ( newHeight != prevHeight )
                {
                    event.mpPane->SetRowHeight( pRow, newHeight );

                    needed -= prevHeight - pRow->mRowHeight;
                }
            }

            pRow = pRow->mpNext;
        }
    }

    // allow user adjusting pane vs. client-area space, for lower-handle

    if ( !forUpperHandle && ofs > clientSize )
    {
        int needed = ofs - clientSize;

        cbRowInfo* pRow = mpPane->GetRowList()[ mpPane->GetRowList().Count() - 1 ];

        // start squeezing rows from the bottom towards the top row

        while( pRow && needed )
        {
            // only not-fixed rows can be squeezed

            if ( !pRow->mHasOnlyFixedBars )
            {
                int prevHeight = pRow->mRowHeight;

                int newHeight  = wxMax( event.mpPane->GetMinimalRowHeight( pRow ),
                                        prevHeight - needed );

                if ( newHeight != prevHeight )
                {
                    event.mpPane->SetRowHeight( pRow, newHeight );

                    needed -= prevHeight - pRow->mRowHeight;
                }
            }

            pRow = pRow->mpPrev;
        }
    }

    if ( forUpperHandle )

        event.mpPane->SetRowHeight( pTheRow, pTheRow->mRowHeight + (-ofs) );
    else
        event.mpPane->SetRowHeight( pTheRow, pTheRow->mRowHeight +   ofs  );

    mpLayout->RecalcLayout(false);

    mpLayout->GetUpdatesManager().OnFinishChanges();
    mpLayout->GetUpdatesManager().UpdateNow();
}