listviews.cpp

video linux conference

/*****************************************************************************
 * ListViews.h: BeOS interface list view class implementation
 *****************************************************************************
 * Copyright (C) 1999, 2000, 2001 VideoLAN
 * $Id: ListViews.cpp 10101 2005-03-02 16:47:31Z robux4 $
 *
 * Authors: Stephan Aßmus <[e-mail]>
 *
 * 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., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
 *****************************************************************************/

#include <stdio.h>
#include <malloc.h>

#include <Bitmap.h>
#include <Entry.h>
#include <String.h>

/* VLC headers */
#include <vlc/vlc.h>
#include <vlc/intf.h>

#include "InterfaceWindow.h"
#include "ListViews.h"
#include "MsgVals.h"

#define MAX_DRAG_HEIGHT        200.0
#define ALPHA                170
#define TEXT_OFFSET            20.0

/*****************************************************************************
 * PlaylistItem class
 *****************************************************************************/
PlaylistItem::PlaylistItem( const char *name )
    : BStringItem( name ),
      fName( "" )
{
    entry_ref ref;
    if ( get_ref_for_path( name, &ref) == B_OK )
        fName.SetTo( ref.name );
}

PlaylistItem::~PlaylistItem()
{
}

/*****************************************************************************
 * PlaylistItem::DrawItem
 *****************************************************************************/
void
PlaylistItem::Draw( BView *owner, BRect frame, bool tintedLine,
                    uint32 mode, bool active, bool playing )
{
    rgb_color color = (rgb_color){ 255, 255, 255, 255 };
    if ( tintedLine )
        color = tint_color( color, 1.04 );
    // background
    if ( IsSelected() )
        color = tint_color( color, B_DARKEN_2_TINT );
    owner->SetLowColor( color );
    owner->FillRect( frame, B_SOLID_LOW );
    // label
    owner->SetHighColor( 0, 0, 0, 255 );
    font_height fh;
    owner->GetFontHeight( &fh );
    const char* text = Text();
    switch ( mode )
    {
        case DISPLAY_NAME:
            if ( fName.CountChars() > 0 )
                text = fName.String();
            break;
        case DISPLAY_PATH:
        default:
            break;
    }
    BString truncatedString( text );
    owner->TruncateString( &truncatedString, B_TRUNCATE_MIDDLE,
                           frame.Width() - TEXT_OFFSET - 4.0 );
    owner->DrawString( truncatedString.String(),
                       BPoint( frame.left + TEXT_OFFSET,
                               frame.top + fh.ascent + 1.0 ) );
    // playmark
    if ( active )
    {
        rgb_color black = (rgb_color){ 0, 0, 0, 255 };
        rgb_color green = (rgb_color){ 0, 255, 0, 255 };
        BRect r( 0.0, 0.0, 10.0, 10.0 );
        r.OffsetTo( frame.left + 4.0,
                    ceilf( ( frame.top + frame.bottom ) / 2.0 ) - 5.0 );
        if ( !playing )
            green = tint_color( color, B_DARKEN_1_TINT );
        rgb_color lightGreen = tint_color( green, B_LIGHTEN_2_TINT );
        rgb_color darkGreen = tint_color( green, B_DARKEN_2_TINT );
        BPoint arrow[3];
        arrow[0] = r.LeftTop();
        arrow[1] = r.LeftBottom();
        arrow[2].x = r.right;
        arrow[2].y = ( r.top + r.bottom ) / 2.0;
        owner->BeginLineArray( 6 );
            // black outline
            owner->AddLine( arrow[0], arrow[1], black );
            owner->AddLine( BPoint( arrow[1].x + 1.0, arrow[1].y - 1.0 ),
                            arrow[2], black );
            owner->AddLine( arrow[0], arrow[2], black );
            // inset arrow
            arrow[0].x += 1.0;
            arrow[0].y += 2.0;
            arrow[1].x += 1.0;
            arrow[1].y -= 2.0;
            arrow[2].x -= 2.0;
            // highlights and shadow
            owner->AddLine( arrow[1], arrow[2], darkGreen );
            owner->AddLine( arrow[0], arrow[2], lightGreen );
            owner->AddLine( arrow[0], arrow[1], lightGreen );
        owner->EndLineArray();
        // fill green
        arrow[0].x += 1.0;
        arrow[0].y += 1.0;
        arrow[1].x += 1.0;
        arrow[1].y -= 1.0;
        arrow[2].x -= 2.0;
        owner->SetHighColor( green );
        owner->FillPolygon( arrow, 3 );
    }
}

/*****************************************************************************
 * DragSortableListView class
 *****************************************************************************/
DragSortableListView::DragSortableListView( BRect frame, const char* name,
                                            list_view_type type, uint32 resizingMode,
                                            uint32 flags )
    : BListView( frame, name, type, resizingMode, flags ),
      fDropRect( 0.0, 0.0, -1.0, -1.0 ),
      fDropIndex( -1 )
{
    SetViewColor( B_TRANSPARENT_32_BIT );
}

DragSortableListView::~DragSortableListView()
{
}

/*****************************************************************************
 * DragSortableListView::Draw
 *****************************************************************************/
void
DragSortableListView::Draw( BRect updateRect )
{
    int32 firstIndex = IndexOf( updateRect.LeftTop() );
    int32 lastIndex = IndexOf( updateRect.RightBottom() );
    if ( firstIndex >= 0 )
    {
        if ( lastIndex < firstIndex )
            lastIndex = CountItems() - 1;
        // update rect contains items
        BRect r( updateRect );
        for ( int32 i = firstIndex; i <= lastIndex; i++)
        {
            r = ItemFrame( i );
            DrawListItem( this, i, r );
        }
        updateRect.top = r.bottom + 1.0;
        if ( updateRect.IsValid() )
        {
            SetLowColor( 255, 255, 255, 255 );
            FillRect( updateRect, B_SOLID_LOW );
        }
    }
    else
    {
        SetLowColor( 255, 255, 255, 255 );
        FillRect( updateRect, B_SOLID_LOW );
    }
    // drop anticipation indication
    if ( fDropRect.IsValid() )
    {
        SetHighColor( 255, 0, 0, 255 );
        StrokeRect( fDropRect );
    }
}

/*****************************************************************************
 * DragSortableListView::InitiateDrag
 *****************************************************************************/
bool
DragSortableListView::InitiateDrag( BPoint point, int32 index, bool )
{
    bool success = false;
    BListItem* item = ItemAt( CurrentSelection( 0 ) );
    if ( !item )
    {
        // workarround a timing problem
        Select( index );
        item = ItemAt( index );
    }
    if ( item )
    {
        // create drag message
        BMessage msg( B_SIMPLE_DATA );
        MakeDragMessage( &msg );
        // figure out drag rect
        float width = Bounds().Width();
        BRect dragRect(0.0, 0.0, width, -1.0);
        // figure out, how many items fit into our bitmap
        int32 numItems;
        bool fade = false;
        for (numItems = 0; BListItem* item = ItemAt( CurrentSelection( numItems ) ); numItems++) {
            dragRect.bottom += ceilf( item->Height() ) + 1.0;
            if ( dragRect.Height() > MAX_DRAG_HEIGHT ) {
                fade = true;
                dragRect.bottom = MAX_DRAG_HEIGHT;
                numItems++;
                break;
            }
        }
        BBitmap* dragBitmap = new BBitmap( dragRect, B_RGB32, true );
        if ( dragBitmap && dragBitmap->IsValid() ) {
            if ( BView *v = new BView( dragBitmap->Bounds(), "helper", B_FOLLOW_NONE, B_WILL_DRAW ) ) {
                dragBitmap->AddChild( v );
                dragBitmap->Lock();
                BRect itemBounds( dragRect) ;
                itemBounds.bottom = 0.0;
                // let all selected items, that fit into our drag_bitmap, draw
                for ( int32 i = 0; i < numItems; i++ ) {
                    int32 index = CurrentSelection( i );
                    BListItem* item = ItemAt( index );
                    itemBounds.bottom = itemBounds.top + ceilf( item->Height() );
                    if ( itemBounds.bottom > dragRect.bottom )
                        itemBounds.bottom = dragRect.bottom;
                    DrawListItem( v, index, itemBounds );
                    itemBounds.top = itemBounds.bottom + 1.0;
                }
                // make a black frame arround the edge
                v->SetHighColor( 0, 0, 0, 255 );
                v->StrokeRect( v->Bounds() );
                v->Sync();
    
                uint8 *bits = (uint8 *)dragBitmap->Bits();
                int32 height = (int32)dragBitmap->Bounds().Height() + 1;
                int32 width = (int32)dragBitmap->Bounds().Width() + 1;
                int32 bpr = dragBitmap->BytesPerRow();
    
                if (fade) {
                    for ( int32 y = 0; y < height - ALPHA / 2; y++, bits += bpr ) {
                        uint8 *line = bits + 3;
                        for (uint8 *end = line + 4 * width; line < end; line += 4)
                            *line = ALPHA;
                    }
                    for ( int32 y = height - ALPHA / 2; y < height; y++, bits += bpr ) {
                        uint8 *line = bits + 3;
                        for (uint8 *end = line + 4 * width; line < end; line += 4)
                            *line = (height - y) << 1;
                    }
                } else {
                    for ( int32 y = 0; y < height; y++, bits += bpr ) {
                        uint8 *line = bits + 3;
                        for (uint8 *end = line + 4 * width; line < end; line += 4)
                            *line = ALPHA;
                    }
                }
                dragBitmap->Unlock();
                success = true;
            }
        }
        if (success)
            DragMessage( &msg, dragBitmap, B_OP_ALPHA, BPoint( 0.0, 0.0 ) );
        else {
            delete dragBitmap;
            DragMessage( &msg, dragRect.OffsetToCopy( point ), this );
        }
    }
    return success;
}

/*****************************************************************************
 * DragSortableListView::WindowActivated
 *****************************************************************************/
void
DragSortableListView::WindowActivated( bool active )
{
    // workarround for buggy focus indication of BScrollView
    if ( BView* view = Parent() )
        view->Invalidate();
}

/*****************************************************************************
 * DragSortableListView::MessageReceived
 *****************************************************************************/
void
DragSortableListView::MessageReceived(BMessage* message)
{
    switch ( message->what )
    {
        case B_MODIFIERS_CHANGED:
            ModifiersChanged();
            break;
        case B_SIMPLE_DATA:
        {
            DragSortableListView *list = NULL;
            if ( message->FindPointer( "list", (void **)&list ) == B_OK
                 && list == this )
            {
                int32 count = CountItems();
                if ( fDropIndex < 0 || fDropIndex > count )
                    fDropIndex = count;
                BList items;
                int32 index;
                for ( int32 i = 0; message->FindInt32( "index", i, &index ) == B_OK; i++ )
                    if ( BListItem* item = ItemAt(index) )
                        items.AddItem( (void*)item );
                if ( items.CountItems() > 0 )
                {
                    if ( modifiers() & B_SHIFT_KEY )
                        CopyItems( items, fDropIndex );
                    else
                        MoveItems( items, fDropIndex );
                }
                fDropIndex = -1;
            }
            break;
        }
        default:
            BListView::MessageReceived( message );
            break;
    }
}

/*****************************************************************************
 * DragSortableListView::MouseMoved
 *****************************************************************************/
void
DragSortableListView::MouseMoved(BPoint where, uint32 transit, const BMessage *msg)
{
    if ( msg && ( msg->what == B_SIMPLE_DATA || msg->what == MSG_SOUNDPLAY ) )
    {
        bool replaceAll = !msg->HasPointer("list") && !(modifiers() & B_SHIFT_KEY);
        switch ( transit )
        {
            case B_ENTERED_VIEW:
                // remember drag message
                // this is needed to react on modifier changes
                fDragMessageCopy = *msg;
            case B_INSIDE_VIEW:
            {
                if ( replaceAll )
                {
                    BRect r( Bounds() );
                    r.bottom--;    // compensate for scrollbar offset
                    _SetDropAnticipationRect( r );
                    fDropIndex = -1;
                }
                else
                {
                    // offset where by half of item height
                    BRect r( ItemFrame( 0 ) );
                    where.y += r.Height() / 2.0;
    
                    int32 index = IndexOf( where );
                    if ( index < 0 )
                        index = CountItems();
                    _SetDropIndex( index );