ctrl_text.cpp
上传用户:riyaled888
上传日期:2009-03-27
资源大小:7338k
文件大小:10k
- /*****************************************************************************
- * ctrl_text.cpp
- *****************************************************************************
- * Copyright (C) 2003 VideoLAN
- * $Id: ctrl_text.cpp 8347 2004-08-01 20:46:01Z 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 "ctrl_text.hpp"
- #include "../events/evt_generic.hpp"
- #include "../events/evt_mouse.hpp"
- #include "../src/generic_bitmap.hpp"
- #include "../src/generic_font.hpp"
- #include "../src/os_factory.hpp"
- #include "../src/os_graphics.hpp"
- #include "../src/os_timer.hpp"
- #include "../utils/position.hpp"
- #include "../utils/ustring.hpp"
- #include "../utils/var_text.hpp"
- #define MOVING_TEXT_STEP 1
- #define MOVING_TEXT_DELAY 30
- #define SEPARATOR_STRING " "
- CtrlText::CtrlText( intf_thread_t *pIntf, VarText &rVariable,
- const GenericFont &rFont, const UString &rHelp,
- uint32_t color, VarBool *pVisible ):
- CtrlGeneric( pIntf, rHelp, pVisible ), m_fsm( pIntf ),
- m_rVariable( rVariable ), m_cmdToManual( this, &transToManual ),
- m_cmdManualMoving( this, &transManualMoving ),
- m_cmdManualStill( this, &transManualStill ),
- m_cmdMove( this, &transMove ),
- m_pEvt( NULL ), m_rFont( rFont ), m_color( color ),
- m_pImg( NULL ), m_pImgDouble( NULL ), m_pCurrImg( NULL ),
- m_xPos( 0 ), m_xOffset( 0 )
- {
- m_pTimer = OSFactory::instance( getIntf() )->createOSTimer(
- Callback( this, &updateText ) );
- // States
- m_fsm.addState( "still" );
- m_fsm.addState( "moving" );
- m_fsm.addState( "manual1" );
- m_fsm.addState( "manual2" );
- m_fsm.addState( "outStill" );
- m_fsm.addState( "outMoving" );
- // Transitions
- m_fsm.addTransition( "still", "mouse:left:down", "manual1",
- &m_cmdToManual );
- m_fsm.addTransition( "manual1", "mouse:left:up", "moving",
- &m_cmdManualMoving );
- m_fsm.addTransition( "moving", "mouse:left:down", "manual2",
- &m_cmdToManual );
- m_fsm.addTransition( "manual2", "mouse:left:up", "still",
- &m_cmdManualStill );
- m_fsm.addTransition( "manual1", "motion", "manual1", &m_cmdMove );
- m_fsm.addTransition( "manual2", "motion", "manual2", &m_cmdMove );
- m_fsm.addTransition( "still", "leave", "outStill" );
- m_fsm.addTransition( "outStill", "enter", "still" );
- m_fsm.addTransition( "moving", "leave", "outMoving" );
- m_fsm.addTransition( "outMoving", "enter", "moving" );
- // Initial state
- m_fsm.setState( "moving" );
- // Observe the variable
- m_rVariable.addObserver( this );
- // Set the text
- displayText( m_rVariable.get() );
- }
- CtrlText::~CtrlText()
- {
- m_rVariable.delObserver( this );
- if( m_pTimer )
- {
- delete m_pTimer;
- }
- if( m_pImg )
- {
- delete m_pImg;
- }
- if( m_pImgDouble )
- {
- delete m_pImgDouble;
- }
- }
- void CtrlText::handleEvent( EvtGeneric &rEvent )
- {
- // Save the event to use it in callbacks
- m_pEvt = &rEvent;
- m_fsm.handleTransition( rEvent.getAsString() );
- }
- bool CtrlText::mouseOver( int x, int y ) const
- {
- if( m_pCurrImg )
- {
- // We have 3 different ways of deciding when to return true here:
- // 1) the mouse is exactly over the text (so if you click between two
- // letters, the text control doesn't catch the event)
- // 2) the mouse is over the rectangle of the control
- // 3) the mouse is over the rectangle of the visible text
- // I don't know which one is the best...
- #if 0
- return( x >= 0 && x < getPosition()->getWidth()
- && m_pCurrImg->hit( x - m_xPos, y ) );
- #endif
- #if 1
- return( x >= 0 && x < getPosition()->getWidth()
- && y >= 0 && y < getPosition()->getHeight() );
- #endif
- #if 0
- return( x >= 0 && x < getPosition()->getWidth()
- && y >= 0 && y < getPosition()->getHeight()
- && x < m_pCurrImg->getWidth() && x < m_pCurrImg->getHeight() );
- #endif
- }
- else
- {
- return false;
- }
- }
- void CtrlText::draw( OSGraphics &rImage, int xDest, int yDest )
- {
- if( m_pCurrImg )
- {
- // Compute the dimensions to draw
- int width = min( m_pCurrImg->getWidth() + m_xPos,
- getPosition()->getWidth() );
- int height = min( m_pCurrImg->getHeight(), getPosition()->getHeight() );
- // Draw the current image
- if( width > 0 && height > 0 )
- {
- rImage.drawBitmap( *m_pCurrImg, -m_xPos, 0, xDest, yDest,
- width, height );
- }
- }
- }
- void CtrlText::setText( const UString &rText, uint32_t color )
- {
- // Change the color
- if( color != 0xFFFFFFFF )
- {
- m_color = color;
- }
- // Change the text
- m_rVariable.set( rText );
- }
- void CtrlText::onUpdate( Subject<VarText> &rVariable )
- {
- displayText( m_rVariable.get() );
- }
- void CtrlText::displayText( const UString &rText )
- {
- // Create the images ('normal' and 'double') from the text
- // 'Normal' image
- if( m_pImg )
- {
- delete m_pImg;
- }
- m_pImg = m_rFont.drawString( rText, m_color );
- if( !m_pImg )
- {
- return;
- }
- // 'Double' image
- const UString doubleStringWithSep = rText + SEPARATOR_STRING + rText;
- if( m_pImgDouble )
- {
- delete m_pImgDouble;
- }
- m_pImgDouble = m_rFont.drawString( doubleStringWithSep, m_color );
- // Update the current image used, as if the control size had changed
- onChangePosition();
- m_xPos = 0;
- if( getPosition() )
- {
- // If the control was in the moving state, check if the scrolling is
- // still necessary
- const string &rState = m_fsm.getState();
- if( rState == "moving" || rState == "outMoving" )
- {
- if( m_pImg && m_pImg->getWidth() >= getPosition()->getWidth() )
- {
- m_pCurrImg = m_pImgDouble;
- m_pTimer->start( MOVING_TEXT_DELAY, false );
- }
- else
- {
- m_pTimer->stop();
- }
- }
- notifyLayout();
- }
- }
- void CtrlText::onChangePosition()
- {
- if( m_pImg && getPosition() )
- {
- if( m_pImg->getWidth() < getPosition()->getWidth() )
- {
- m_pCurrImg = m_pImg;
- }
- else
- {
- m_pCurrImg = m_pImgDouble;
- }
- }
- else
- {
- // m_pImg is a better default value than m_pImgDouble, but anyway we
- // don't care because the control is never drawn without position :)
- m_pCurrImg = m_pImg;
- }
- }
- void CtrlText::transToManual( SkinObject *pCtrl )
- {
- CtrlText *pThis = (CtrlText*)pCtrl;
- EvtMouse *pEvtMouse = (EvtMouse*)pThis->m_pEvt;
- // Compute the offset
- pThis->m_xOffset = pEvtMouse->getXPos() - pThis->m_xPos;
- pThis->m_pTimer->stop();
- pThis->captureMouse();
- }
- void CtrlText::transManualMoving( SkinObject *pCtrl )
- {
- CtrlText *pThis = (CtrlText*)pCtrl;
- pThis->releaseMouse();
- // Start the automatic movement, but only if the text is wider than the
- // control
- if( pThis->m_pImg &&
- pThis->m_pImg->getWidth() >= pThis->getPosition()->getWidth() )
- {
- // The current image may have been set incorrectly in displayText(), so
- // set the correct value
- pThis->m_pCurrImg = pThis->m_pImgDouble;
- pThis->m_pTimer->start( MOVING_TEXT_DELAY, false );
- }
- }
- void CtrlText::transManualStill( SkinObject *pCtrl )
- {
- CtrlText *pThis = (CtrlText*)pCtrl;
- pThis->releaseMouse();
- }
- void CtrlText::transMove( SkinObject *pCtrl )
- {
- CtrlText *pThis = (CtrlText*)pCtrl;
- EvtMouse *pEvtMouse = (EvtMouse*)pThis->m_pEvt;
- // Do nothing if the text fits in the control
- if( pThis->m_pImg &&
- pThis->m_pImg->getWidth() >= pThis->getPosition()->getWidth() )
- {
- // The current image may have been set incorrectly in displayText(), so
- // we set the correct value
- pThis->m_pCurrImg = pThis->m_pImgDouble;
- // Compute the new position of the left side, and make sure it is
- // in the correct range
- pThis->m_xPos = (pEvtMouse->getXPos() - pThis->m_xOffset);
- pThis->adjust( pThis->m_xPos );
- pThis->notifyLayout();
- }
- }
- void CtrlText::updateText( SkinObject *pCtrl )
- {
- CtrlText *pThis = (CtrlText*)pCtrl;
- pThis->m_xPos -= MOVING_TEXT_STEP;
- pThis->adjust( pThis->m_xPos );
- pThis->notifyLayout();
- }
- void CtrlText::adjust( int &position )
- {
- // {m_pImgDouble->getWidth() - m_pImg->getWidth()} is the period of the
- // bitmap; remember that the string used to generate m_pImgDouble is of the
- // form: "foo foo", the number of spaces being a parameter
- if( !m_pImg )
- {
- return;
- }
- position %= m_pImgDouble->getWidth() - m_pImg->getWidth();
- if( position > 0 )
- {
- position -= m_pImgDouble->getWidth() - m_pImg->getWidth();
- }
- }