slideshowui.cpp

Trolltech公司发布的图形界面操作系统。可在qt-embedded-2.3.10平台上编译为嵌入式图形界面操作系统。

/**********************************************************************
** Copyright (C) 2000-2005 Trolltech AS.  All rights reserved.
**
** This file is part of the Qtopia Environment.
** 
** 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.
** 
** A copy of the GNU GPL license version 2 is included in this package as 
** LICENSE.GPL.
**
** 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.
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** the code of this program with Qtopia applications copyrighted, developed
** and distributed by Trolltech under the terms of the Qtopia Personal Use
** License Agreement. You must comply with the GNU General Public License
** in all respects for all of the code used other than the applications
** licensed under the Qtopia Personal Use License Agreement. If you modify
** this file, you may extend this exception to your version of the file,
** but you are not obligated to do so. If you do not wish to do so, delete
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**********************************************************************/

#include "slideshowui.h"

#include <qtopia/image.h>

#include <qpainter.h>
#include <qcolor.h>
#include <qfontmetrics.h>

SlideShowUI::SlideShowUI( QWidget* parent, const char* name, WFlags f )
    : QWidget( parent, name, f | Qt::WResizeNoErase | Qt::WRepaintNoErase ),
    display_name( false )
{ }

void SlideShowUI::setImage( const DocLnk& lnk )
{
    // Clear buffer, update image, update fitted name and update display
    image_buffer.resize( 0, 0 );
    image = lnk;
    if( display_name ) calculateFittedName();
    update();
}

void SlideShowUI::paintEvent( QPaintEvent* )
{
#define NAME_POSX 2
#define NAME_POSY 2
#define NAME_COLOR QColor( 162, 190, 0 )
#define SHADOW_OFFSET 1

    // If image not loaded, load image into buffer
    if( image_buffer.isNull() && !image.file().isNull() ) {
        // Scale image to fit within the current widget dimensions
        // while keeping the original width:height ratio
        // Load scaled image to buffer
        image_buffer = Image::loadScaled( image.file(), width(), height() );
        // Update image position
        image_position.setX( ( width() - image_buffer.width() ) / 2 );
        image_position.setY( ( height() - image_buffer.height() ) / 2 );
    }
    
    QPainter painter( this );
    
    // If image has transparency, fill background and draw image
    // Otherwise, draw image and fill remaining background
    if( image_buffer.hasAlpha() ) {
        painter.fillRect( rect(), Qt::black );
        painter.drawPixmap( image_position, image_buffer );
    } else {
        painter.drawPixmap( image_position, image_buffer );
        QRect region( image_buffer.rect() );
        region.moveBy( image_position.x(), image_position.y() );
        painter.setClipRegion( QRegion( rect() ).subtract( region ) );
        painter.setClipping( true );
        painter.fillRect( rect(), Qt::black );
        painter.setClipping( false );
    }
        
    // If display name, draw fitted name onto widget
    if( display_name ) {
        // Draw shadow
        painter.setPen( Qt::black );
        painter.drawText( NAME_POSX + SHADOW_OFFSET, 
           painter.fontInfo().pointSize() + NAME_POSY + SHADOW_OFFSET, 
           fitted_name );
        // Draw fitted name
        painter.setPen( NAME_COLOR );
        painter.drawText( NAME_POSX, painter.fontInfo().pointSize() + NAME_POSY, 
            fitted_name );
    }
}

void SlideShowUI::resizeEvent( QResizeEvent* )
{
    // Update image position
    image_position.setX( ( width() - image_buffer.width() ) / 2 );
    image_position.setY( ( height() - image_buffer.height() ) / 2 );
    
    // If display name, calculate fitted name
    if( display_name ) calculateFittedName();
}

#ifdef QTOPIA_PHONE
void SlideShowUI::keyPressEvent( QKeyEvent* e )
{
    if( e->key() == Qt::Key_Back ) {
        emit pressed();
        e->accept();
    }
}
#endif

void SlideShowUI::mousePressEvent( QMouseEvent* )
{
    emit pressed();
}

void SlideShowUI::calculateFittedName()
{
    fitted_name = image.name();
    
    QFontMetrics font_metrics( font() );
    // If name is larger than the current width, reduce name
    if( font_metrics.width( fitted_name ) > width() - NAME_POSX ) {
        fitted_name = "...";
        int i = 0;
        // Add to fitted name while fitted name is less than current width
            while( !image.name()[ i ].isNull() && 
                font_metrics.width( fitted_name + image.name()[i] ) < 
                    width() - NAME_POSX )
                fitted_name += image.name()[i++];
        fitted_name.remove( 0, 3 );
        fitted_name += "...";
    }
}