position.cpp
资源名称:vlc-1.0.5.zip [点击查看]
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上传日期:2020-07-06
资源大小:29949k
文件大小:8k
源码类别:
midi
开发平台:
Unix_Linux
- /*****************************************************************************
- * position.cpp
- *****************************************************************************
- * Copyright (C) 2003 the VideoLAN team
- * $Id: 6ba21cb3c094dc8d7b52e57e12d8d515da42c49a $
- *
- * Authors: Cyril Deguet <asmax@via.ecp.fr>
- * Olivier Teulière <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., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
- *****************************************************************************/
- #include "position.hpp"
- const string VarBox::m_type = "box";
- SkinsRect::SkinsRect( int left, int top, int right, int bottom ):
- m_left( left ), m_top( top ), m_right( right ), m_bottom( bottom )
- {
- }
- Position::Position( int left, int top, int right, int bottom,
- const GenericRect &rRect,
- Ref_t refLeftTop, Ref_t refRightBottom,
- bool xKeepRatio, bool yKeepRatio ):
- m_left( left ), m_top( top ), m_right( right ), m_bottom( bottom ),
- m_rRect( rRect ), m_refLeftTop( refLeftTop ),
- m_refRighBottom( refRightBottom ), m_xKeepRatio( xKeepRatio ),
- m_yKeepRatio( yKeepRatio )
- {
- // Here is how the resizing algorithm works:
- //
- // - if we "keep the ratio" (xkeepratio="true" in the XML), the relative
- // position of the control in the parent box (i.e. the given rRect) is
- // saved, and will be kept constant. The size of the control will not
- // be changed, only its position may vary. To do that, we consider the
- // part of the box to the left of the control (for an horizontal
- // resizing) and the part of the box to the right of the control,
- // and we make sure that the ratio between their widths is constant.
- //
- // - if we don't keep the ratio, the resizing algorithm is completely
- // different. We consider that the top left hand corner of the control
- // ("lefttop" attribute in the XML) is linked to one of the 4 corners
- // of the parent box ("lefttop", "leftbottom", "righttop" and
- // "rightbottom" values for the attribute). Same thing for the bottom
- // right hand corner ("rightbottom" attribute). When resizing occurs,
- // the linked corners will move together, and this will drive the
- // moving/resizing of the control.
- // Initialize the horizontal ratio
- if( m_xKeepRatio )
- {
- // First compute the width of the box minus the width of the control
- int freeSpace = m_rRect.getWidth() - (m_right - m_left);
- // Instead of computing left/right, we compute left/(left+right),
- // which is more convenient in my opinion.
- if( freeSpace != 0 )
- {
- m_xRatio = (double)m_left / (double)freeSpace;
- }
- else
- {
- // If the control has the same size as the box, we can't compute
- // the ratio in the same way (otherwise we would divide by zero).
- // So we consider that the intent was to keep the control centered
- // (if you are unhappy with this, go and fix your skin :))
- m_xRatio = 0.5;
- }
- }
- // Initial the vertical ratio
- if( m_yKeepRatio )
- {
- // First compute the height of the box minus the height of the control
- int freeSpace = m_rRect.getHeight() - (m_bottom - m_top);
- // Instead of computing top/bottom, we compute top/(top+bottom),
- // which is more convenient in my opinion.
- if( freeSpace != 0 )
- {
- m_yRatio = (double)m_top / (double)freeSpace;
- }
- else
- {
- // If the control has the same size as the box, we can't compute
- // the ratio in the same way (otherwise we would divide by zero).
- // So we consider that the intent was to keep the control centered
- // (if you are unhappy with this, go and fix your skin :))
- m_yRatio = 0.5;
- }
- }
- }
- int Position::getLeft() const
- {
- if( m_xKeepRatio )
- {
- // Ratio mode
- // First compute the width of the box minus the width of the control
- int freeSpace = m_rRect.getWidth() - (m_right - m_left);
- return m_rRect.getLeft() + (int)(m_xRatio * freeSpace);
- }
- else
- {
- switch( m_refLeftTop )
- {
- case kLeftTop:
- case kLeftBottom:
- return m_rRect.getLeft() + m_left;
- break;
- case kRightTop:
- case kRightBottom:
- return m_rRect.getLeft() + m_rRect.getWidth() + m_left - 1;
- break;
- }
- // Avoid a warning
- return 0;
- }
- }
- int Position::getTop() const
- {
- if( m_yKeepRatio )
- {
- // Ratio mode
- // First compute the height of the box minus the height of the control
- int freeSpace = m_rRect.getHeight() - (m_bottom - m_top);
- return m_rRect.getTop() + (int)(m_yRatio * freeSpace);
- }
- else
- {
- switch( m_refLeftTop )
- {
- case kLeftTop:
- case kRightTop:
- return m_rRect.getTop() + m_top;
- break;
- case kRightBottom:
- case kLeftBottom:
- return m_rRect.getTop() + m_rRect.getHeight() + m_top - 1;
- break;
- }
- // Avoid a warning
- return 0;
- }
- }
- int Position::getRight() const
- {
- if( m_xKeepRatio )
- {
- // Ratio mode
- // The width of the control being constant, we can use the result of
- // getLeft() (this will avoid rounding issues).
- return getLeft() + m_right - m_left;
- }
- else
- {
- switch( m_refRighBottom )
- {
- case kLeftTop:
- case kLeftBottom:
- return m_rRect.getLeft() + m_right;
- break;
- case kRightTop:
- case kRightBottom:
- return m_rRect.getLeft() + m_rRect.getWidth() + m_right - 1;
- break;
- }
- // Avoid a warning
- return 0;
- }
- }
- int Position::getBottom() const
- {
- if( m_yKeepRatio )
- {
- // Ratio mode
- // The height of the control being constant, we can use the result of
- // getTop() (this will avoid rounding issues).
- return getTop() + m_bottom - m_top;
- }
- else
- {
- switch( m_refRighBottom )
- {
- case kLeftTop:
- case kRightTop:
- return m_rRect.getTop() + m_bottom;
- break;
- case kLeftBottom:
- case kRightBottom:
- return m_rRect.getTop() + m_rRect.getHeight() + m_bottom - 1;
- break;
- }
- // Avoid a warning
- return 0;
- }
- }
- int Position::getWidth() const
- {
- return getRight() - getLeft() + 1;
- }
- int Position::getHeight() const
- {
- return getBottom() - getTop() + 1;
- }
- VarBox::VarBox( intf_thread_t *pIntf, int width, int height ):
- Variable( pIntf ), m_width( width ), m_height( height )
- {
- }
- int VarBox::getWidth() const
- {
- return m_width;
- }
- int VarBox::getHeight() const
- {
- return m_height;
- }
- void VarBox::setSize( int width, int height )
- {
- m_width = width;
- m_height = height;
- notify();
- }