ctrl_list.cpp
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上传日期:2009-03-27
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- /*****************************************************************************
- * ctrl_list.cpp
- *****************************************************************************
- * Copyright (C) 2003 VideoLAN
- * $Id: ctrl_list.cpp 8493 2004-08-22 10:38:26Z asmax $
- *
- * Authors: Cyril Deguet <asmax@via.ecp.fr>
- * Olivier Teuli鑢e <ipkiss@via.ecp.fr>
- *
- * 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 <math.h>
- #include "ctrl_list.hpp"
- #include "../src/os_factory.hpp"
- #include "../src/os_graphics.hpp"
- #include "../src/generic_bitmap.hpp"
- #include "../src/generic_font.hpp"
- #include "../utils/position.hpp"
- #include "../utils/ustring.hpp"
- #include "../events/evt_key.hpp"
- #include "../events/evt_mouse.hpp"
- #include "../events/evt_scroll.hpp"
- #include "vlc_keys.h"
- #ifdef sun
- # include "solaris_specific.h" // for lrint
- #endif
- #define SCROLL_STEP 0.05
- #define LINE_INTERVAL 1 // Number of pixels inserted between 2 lines
- CtrlList::CtrlList( intf_thread_t *pIntf, VarList &rList, GenericFont &rFont,
- uint32_t fgColor, uint32_t playColor, uint32_t bgColor1,
- uint32_t bgColor2, uint32_t selColor,
- const UString &rHelp, VarBool *pVisible ):
- CtrlGeneric( pIntf, rHelp, pVisible ), m_rList( rList ), m_rFont( rFont ),
- m_fgColor( fgColor ), m_playColor( playColor ), m_bgColor1( bgColor1 ),
- m_bgColor2( bgColor2 ), m_selColor( selColor ), m_pLastSelected( NULL ),
- m_pImage( NULL ), m_lastPos( 0 )
- {
- // Observe the list and position variables
- m_rList.addObserver( this );
- m_rList.getPositionVar().addObserver( this );
- makeImage();
- }
- CtrlList::~CtrlList()
- {
- m_rList.getPositionVar().delObserver( this );
- m_rList.delObserver( this );
- if( m_pImage )
- {
- delete m_pImage;
- }
- }
- void CtrlList::onUpdate( Subject<VarList> &rList )
- {
- autoScroll();
- m_pLastSelected = NULL;
- }
- void CtrlList::onUpdate( Subject<VarPercent> &rPercent )
- {
- // Get the size of the control
- const Position *pPos = getPosition();
- if( !pPos )
- {
- return;
- }
- int height = pPos->getHeight();
- // How many lines can be displayed ?
- int itemHeight = m_rFont.getSize() + LINE_INTERVAL;
- int maxItems = height / itemHeight;
- // Determine what is the first item to display
- VarPercent &rVarPos = m_rList.getPositionVar();
- int firstItem = 0;
- int excessItems = m_rList.size() - maxItems;
- if( excessItems > 0 )
- {
- // a simple (int)(...) causes rounding errors !
- #ifdef _MSC_VER
- # define lrint (int)
- #endif
- firstItem = lrint( (1.0 - rVarPos.get()) * (double)excessItems );
- }
- if( m_lastPos != firstItem )
- {
- // Redraw the control if the position has changed
- m_lastPos = firstItem;
- makeImage();
- notifyLayout();
- }
- }
- void CtrlList::onResize()
- {
- // Get the size of the control
- const Position *pPos = getPosition();
- if( !pPos )
- {
- return;
- }
- int height = pPos->getHeight();
- // How many lines can be displayed ?
- int itemHeight = m_rFont.getSize() + LINE_INTERVAL;
- int maxItems = height / itemHeight;
- // Update the position variable
- VarPercent &rVarPos = m_rList.getPositionVar();
- int excessItems = m_rList.size() - maxItems;
- if( excessItems > 0 )
- {
- double newVal = 1.0 - (double)m_lastPos / excessItems;
- if( newVal >= 0 )
- {
- // Change the position to keep the same first displayed item
- rVarPos.set( 1.0 - (double)m_lastPos / excessItems );
- }
- else
- {
- // We cannot keep the current first item
- m_lastPos = excessItems;
- }
- }
- makeImage();
- notifyLayout();
- }
- void CtrlList::onPositionChange()
- {
- makeImage();
- notifyLayout();
- }
- void CtrlList::handleEvent( EvtGeneric &rEvent )
- {
- if( rEvent.getAsString().find( "key:down" ) != string::npos )
- {
- int key = ((EvtKey&)rEvent).getKey();
- VarList::Iterator it = m_rList.begin();
- bool previousWasSelected = false;
- while( it != m_rList.end() )
- {
- VarList::Iterator next = it;
- ++next;
- if( key == KEY_UP )
- {
- // Scroll up one item
- if( it != m_rList.begin() || &*it != m_pLastSelected )
- {
- bool nextWasSelected = ( &*next == m_pLastSelected );
- (*it).m_selected = nextWasSelected;
- if( nextWasSelected )
- {
- m_pLastSelected = &*it;
- }
- }
- }
- else if( key == KEY_DOWN )
- {
- // Scroll down one item
- if( next != m_rList.end() || &*it != m_pLastSelected )
- {
- (*it).m_selected = previousWasSelected;
- }
- if( previousWasSelected )
- {
- m_pLastSelected = &*it;
- previousWasSelected = false;
- }
- else
- {
- previousWasSelected = ( &*it == m_pLastSelected );
- }
- }
- it = next;
- }
- // Redraw the control
- makeImage();
- notifyLayout();
- }
- else if( rEvent.getAsString().find( "mouse:left" ) != string::npos )
- {
- EvtMouse &rEvtMouse = (EvtMouse&)rEvent;
- const Position *pos = getPosition();
- int yPos = m_lastPos + ( rEvtMouse.getYPos() - pos->getTop() ) /
- (m_rFont.getSize() + LINE_INTERVAL);
- VarList::Iterator it;
- int index = 0;
- if( rEvent.getAsString().find( "mouse:left:down:ctrl,shift" ) !=
- string::npos )
- {
- // Flag to know if the current item must be selected
- bool select = false;
- for( it = m_rList.begin(); it != m_rList.end(); it++ )
- {
- bool nextSelect = select;
- if( index == yPos || &*it == m_pLastSelected )
- {
- if( select )
- {
- nextSelect = false;
- }
- else
- {
- select = true;
- nextSelect = true;
- }
- }
- (*it).m_selected = (*it).m_selected || select;
- select = nextSelect;
- index++;
- }
- }
- else if( rEvent.getAsString().find( "mouse:left:down:ctrl" ) !=
- string::npos )
- {
- for( it = m_rList.begin(); it != m_rList.end(); it++ )
- {
- if( index == yPos )
- {
- (*it).m_selected = ! (*it).m_selected;
- m_pLastSelected = &*it;
- break;
- }
- index++;
- }
- }
- else if( rEvent.getAsString().find( "mouse:left:down:shift" ) !=
- string::npos )
- {
- // Flag to know if the current item must be selected
- bool select = false;
- for( it = m_rList.begin(); it != m_rList.end(); it++ )
- {
- bool nextSelect = select;
- if( index == yPos || &*it == m_pLastSelected )
- {
- if( select )
- {
- nextSelect = false;
- }
- else
- {
- select = true;
- nextSelect = true;
- }
- }
- (*it).m_selected = select;
- select = nextSelect;
- index++;
- }
- }
- else if( rEvent.getAsString().find( "mouse:left:down" ) !=
- string::npos )
- {
- for( it = m_rList.begin(); it != m_rList.end(); it++ )
- {
- if( index == yPos )
- {
- (*it).m_selected = true;
- m_pLastSelected = &*it;
- }
- else
- {
- (*it).m_selected = false;
- }
- index++;
- }
- }
- else if( rEvent.getAsString().find( "mouse:left:dblclick" ) !=
- string::npos )
- {
- for( it = m_rList.begin(); it != m_rList.end(); it++ )
- {
- if( index == yPos )
- {
- (*it).m_selected = true;
- m_pLastSelected = &*it;
- // Execute the action associated to this item
- m_rList.action( &*it );
- }
- else
- {
- (*it).m_selected = false;
- }
- index++;
- }
- }
- // Redraw the control
- makeImage();
- notifyLayout();
- }
- else if( rEvent.getAsString().find( "scroll" ) != string::npos )
- {
- int direction = ((EvtScroll&)rEvent).getDirection();
- double percentage = m_rList.getPositionVar().get();
- if( direction == EvtScroll::kUp )
- {
- percentage += SCROLL_STEP;
- }
- else
- {
- percentage -= SCROLL_STEP;
- }
- m_rList.getPositionVar().set( percentage );
- }
- }
- bool CtrlList::mouseOver( int x, int y ) const
- {
- const Position *pPos = getPosition();
- if( pPos )
- {
- int width = pPos->getWidth();
- int height = pPos->getHeight();
- return ( x >= 0 && x <= width && y >= 0 && y <= height );
- }
- return false;
- }
- void CtrlList::draw( OSGraphics &rImage, int xDest, int yDest )
- {
- if( m_pImage )
- {
- rImage.drawGraphics( *m_pImage, 0, 0, xDest, yDest );
- }
- }
- void CtrlList::autoScroll()
- {
- // Get the size of the control
- const Position *pPos = getPosition();
- if( !pPos )
- {
- return;
- }
- int height = pPos->getHeight();
- // How many lines can be displayed ?
- int itemHeight = m_rFont.getSize() + LINE_INTERVAL;
- int maxItems = height / itemHeight;
- // Find the current playing stream
- int playIndex = 0;
- VarList::ConstIterator it;
- for( it = m_rList.begin(); it != m_rList.end(); it++ )
- {
- if( (*it).m_playing )
- {
- break;
- }
- playIndex++;
- }
- if( it != m_rList.end() &&
- ( playIndex < m_lastPos || playIndex >= m_lastPos + maxItems ) )
- {
- // Scroll the list to have the playing stream visible
- VarPercent &rVarPos = m_rList.getPositionVar();
- rVarPos.set( 1.0 - (float)playIndex / (float)m_rList.size() );
- // The image will be changed by onUpdate(VarPercent&)
- }
- else
- {
- makeImage();
- notifyLayout();
- }
- }
- void CtrlList::makeImage()
- {
- if( m_pImage )
- {
- delete m_pImage;
- }
- // Get the size of the control
- const Position *pPos = getPosition();
- if( !pPos )
- {
- return;
- }
- int width = pPos->getWidth();
- int height = pPos->getHeight();
- int itemHeight = m_rFont.getSize() + LINE_INTERVAL;
- // Create an image
- OSFactory *pOsFactory = OSFactory::instance( getIntf() );
- m_pImage = pOsFactory->createOSGraphics( width, height );
- // Current background color
- uint32_t bgColor = m_bgColor1;
- // Draw the background
- VarList::ConstIterator it = m_rList[m_lastPos];
- for( int yPos = 0; yPos < height; yPos += itemHeight )
- {
- int rectHeight = __MIN( itemHeight, height - yPos );
- if( it != m_rList.end() )
- {
- uint32_t color = ( (*it).m_selected ? m_selColor : bgColor );
- m_pImage->fillRect( 0, yPos, width, rectHeight, color );
- it++;
- }
- else
- {
- m_pImage->fillRect( 0, yPos, width, rectHeight, bgColor );
- }
- // Flip the background color
- bgColor = ( bgColor == m_bgColor1 ? m_bgColor2 : m_bgColor1 );
- }
- // Draw the items
- int yPos = 0;
- for( it = m_rList[m_lastPos]; it != m_rList.end() && yPos < height; it++ )
- {
- UString *pStr = (UString*)((*it).m_cString.get());
- uint32_t color = ( (*it).m_playing ? m_playColor : m_fgColor );
- // Draw the text
- GenericBitmap *pText = m_rFont.drawString( *pStr, color, width );
- if( !pText )
- {
- return;
- }
- yPos += itemHeight - pText->getHeight();
- int ySrc = 0;
- if( yPos < 0 )
- {
- ySrc = - yPos;
- yPos = 0;
- }
- int lineHeight = __MIN( pText->getHeight() - ySrc, height - yPos );
- m_pImage->drawBitmap( *pText, 0, ySrc, 0, yPos, pText->getWidth(),
- lineHeight );
- yPos += (pText->getHeight() - ySrc );
- delete pText;
- }
- }