listviews.cpp

VLC媒体播放程序

/*****************************************************************************
 * ListViews.h: BeOS interface list view class implementation
 *****************************************************************************
 * Copyright (C) 1999, 2000, 2001 VideoLAN
 * $Id: ListViews.cpp,v 1.6 2004/01/26 16:52:31 zorglub Exp $
 *
 * 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 "VlcWrapper.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:
			{