彻底改版2.0
This commit is contained in:
feiyangqingyun
480
third/qwtdemo/examples/realtime/scrollzoomer.cpp
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480
third/qwtdemo/examples/realtime/scrollzoomer.cpp
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#include <qevent.h>
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#include <qwt_plot_canvas.h>
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#include <qwt_plot_layout.h>
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#include <qwt_scale_engine.h>
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#include <qwt_scale_widget.h>
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#include "scrollbar.h"
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#include "scrollzoomer.h"
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class ScrollData
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{
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public:
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ScrollData():
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scrollBar( NULL ),
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position( ScrollZoomer::OppositeToScale ),
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mode( Qt::ScrollBarAsNeeded )
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{
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}
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~ScrollData()
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{
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delete scrollBar;
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}
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ScrollBar *scrollBar;
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ScrollZoomer::ScrollBarPosition position;
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Qt::ScrollBarPolicy mode;
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};
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ScrollZoomer::ScrollZoomer( QWidget *canvas ):
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QwtPlotZoomer( canvas ),
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d_cornerWidget( NULL ),
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d_hScrollData( NULL ),
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d_vScrollData( NULL ),
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d_inZoom( false )
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{
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for ( int axis = 0; axis < QwtPlot::axisCnt; axis++ )
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d_alignCanvasToScales[ axis ] = false;
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if ( !canvas )
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return;
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d_hScrollData = new ScrollData;
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d_vScrollData = new ScrollData;
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}
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ScrollZoomer::~ScrollZoomer()
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{
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delete d_cornerWidget;
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delete d_vScrollData;
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delete d_hScrollData;
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}
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void ScrollZoomer::rescale()
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{
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QwtScaleWidget *xScale = plot()->axisWidget( xAxis() );
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QwtScaleWidget *yScale = plot()->axisWidget( yAxis() );
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if ( zoomRectIndex() <= 0 )
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{
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if ( d_inZoom )
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{
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xScale->setMinBorderDist( 0, 0 );
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yScale->setMinBorderDist( 0, 0 );
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QwtPlotLayout *layout = plot()->plotLayout();
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for ( int axis = 0; axis < QwtPlot::axisCnt; axis++ )
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layout->setAlignCanvasToScale( axis, d_alignCanvasToScales[ axis ] );
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d_inZoom = false;
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}
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}
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else
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{
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if ( !d_inZoom )
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{
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/*
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We set a minimum border distance.
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Otherwise the canvas size changes when scrolling,
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between situations where the major ticks are at
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the canvas borders (requiring extra space for the label)
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and situations where all labels can be painted below/top
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or left/right of the canvas.
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*/
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int start, end;
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xScale->getBorderDistHint( start, end );
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xScale->setMinBorderDist( start, end );
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yScale->getBorderDistHint( start, end );
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yScale->setMinBorderDist( start, end );
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QwtPlotLayout *layout = plot()->plotLayout();
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for ( int axis = 0; axis < QwtPlot::axisCnt; axis++ )
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{
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d_alignCanvasToScales[axis] =
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layout->alignCanvasToScale( axis );
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}
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layout->setAlignCanvasToScales( false );
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d_inZoom = true;
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}
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}
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QwtPlotZoomer::rescale();
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updateScrollBars();
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}
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ScrollBar *ScrollZoomer::scrollBar( Qt::Orientation orientation )
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{
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ScrollBar *&sb = ( orientation == Qt::Vertical )
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? d_vScrollData->scrollBar : d_hScrollData->scrollBar;
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if ( sb == NULL )
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{
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sb = new ScrollBar( orientation, canvas() );
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sb->hide();
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connect( sb,
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SIGNAL( valueChanged( Qt::Orientation, double, double ) ),
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SLOT( scrollBarMoved( Qt::Orientation, double, double ) ) );
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}
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return sb;
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}
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ScrollBar *ScrollZoomer::horizontalScrollBar() const
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{
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return d_hScrollData->scrollBar;
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}
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ScrollBar *ScrollZoomer::verticalScrollBar() const
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{
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return d_vScrollData->scrollBar;
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}
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void ScrollZoomer::setHScrollBarMode( Qt::ScrollBarPolicy mode )
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{
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if ( hScrollBarMode() != mode )
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{
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d_hScrollData->mode = mode;
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updateScrollBars();
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}
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}
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void ScrollZoomer::setVScrollBarMode( Qt::ScrollBarPolicy mode )
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{
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if ( vScrollBarMode() != mode )
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{
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d_vScrollData->mode = mode;
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updateScrollBars();
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}
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}
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Qt::ScrollBarPolicy ScrollZoomer::hScrollBarMode() const
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{
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return d_hScrollData->mode;
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}
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Qt::ScrollBarPolicy ScrollZoomer::vScrollBarMode() const
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{
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return d_vScrollData->mode;
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}
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void ScrollZoomer::setHScrollBarPosition( ScrollBarPosition pos )
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{
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if ( d_hScrollData->position != pos )
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{
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d_hScrollData->position = pos;
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updateScrollBars();
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}
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}
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void ScrollZoomer::setVScrollBarPosition( ScrollBarPosition pos )
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{
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if ( d_vScrollData->position != pos )
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{
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d_vScrollData->position = pos;
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updateScrollBars();
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}
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}
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ScrollZoomer::ScrollBarPosition ScrollZoomer::hScrollBarPosition() const
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{
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return d_hScrollData->position;
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}
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ScrollZoomer::ScrollBarPosition ScrollZoomer::vScrollBarPosition() const
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{
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return d_vScrollData->position;
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}
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void ScrollZoomer::setCornerWidget( QWidget *w )
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{
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if ( w != d_cornerWidget )
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{
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if ( canvas() )
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{
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delete d_cornerWidget;
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d_cornerWidget = w;
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if ( d_cornerWidget->parent() != canvas() )
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d_cornerWidget->setParent( canvas() );
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updateScrollBars();
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}
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}
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}
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QWidget *ScrollZoomer::cornerWidget() const
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{
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return d_cornerWidget;
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}
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bool ScrollZoomer::eventFilter( QObject *object, QEvent *event )
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{
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if ( object == canvas() )
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{
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switch( event->type() )
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{
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case QEvent::Resize:
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{
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int left, top, right, bottom;
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canvas()->getContentsMargins( &left, &top, &right, &bottom );
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QRect rect;
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rect.setSize( static_cast<QResizeEvent *>( event )->size() );
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rect.adjust( left, top, -right, -bottom );
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layoutScrollBars( rect );
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break;
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}
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case QEvent::ChildRemoved:
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{
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const QObject *child =
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static_cast<QChildEvent *>( event )->child();
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if ( child == d_cornerWidget )
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d_cornerWidget = NULL;
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else if ( child == d_hScrollData->scrollBar )
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d_hScrollData->scrollBar = NULL;
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else if ( child == d_vScrollData->scrollBar )
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d_vScrollData->scrollBar = NULL;
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break;
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}
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default:
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break;
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}
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}
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return QwtPlotZoomer::eventFilter( object, event );
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}
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bool ScrollZoomer::needScrollBar( Qt::Orientation orientation ) const
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{
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Qt::ScrollBarPolicy mode;
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double zoomMin, zoomMax, baseMin, baseMax;
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if ( orientation == Qt::Horizontal )
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{
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mode = d_hScrollData->mode;
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baseMin = zoomBase().left();
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baseMax = zoomBase().right();
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zoomMin = zoomRect().left();
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zoomMax = zoomRect().right();
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}
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else
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{
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mode = d_vScrollData->mode;
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baseMin = zoomBase().top();
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baseMax = zoomBase().bottom();
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zoomMin = zoomRect().top();
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zoomMax = zoomRect().bottom();
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}
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bool needed = false;
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switch( mode )
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{
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case Qt::ScrollBarAlwaysOn:
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needed = true;
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break;
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case Qt::ScrollBarAlwaysOff:
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needed = false;
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break;
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default:
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{
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if ( baseMin < zoomMin || baseMax > zoomMax )
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needed = true;
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break;
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}
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}
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return needed;
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}
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void ScrollZoomer::updateScrollBars()
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{
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if ( !canvas() )
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return;
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const int xAxis = QwtPlotZoomer::xAxis();
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const int yAxis = QwtPlotZoomer::yAxis();
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int xScrollBarAxis = xAxis;
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if ( hScrollBarPosition() == OppositeToScale )
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xScrollBarAxis = oppositeAxis( xScrollBarAxis );
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int yScrollBarAxis = yAxis;
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if ( vScrollBarPosition() == OppositeToScale )
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yScrollBarAxis = oppositeAxis( yScrollBarAxis );
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QwtPlotLayout *layout = plot()->plotLayout();
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bool showHScrollBar = needScrollBar( Qt::Horizontal );
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if ( showHScrollBar )
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{
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ScrollBar *sb = scrollBar( Qt::Horizontal );
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sb->setPalette( plot()->palette() );
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sb->setInverted( !plot()->axisScaleDiv( xAxis ).isIncreasing() );
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sb->setBase( zoomBase().left(), zoomBase().right() );
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sb->moveSlider( zoomRect().left(), zoomRect().right() );
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if ( !sb->isVisibleTo( canvas() ) )
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{
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sb->show();
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layout->setCanvasMargin( layout->canvasMargin( xScrollBarAxis )
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+ sb->extent(), xScrollBarAxis );
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}
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}
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else
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{
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if ( horizontalScrollBar() )
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{
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horizontalScrollBar()->hide();
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layout->setCanvasMargin( layout->canvasMargin( xScrollBarAxis )
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- horizontalScrollBar()->extent(), xScrollBarAxis );
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}
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}
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bool showVScrollBar = needScrollBar( Qt::Vertical );
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if ( showVScrollBar )
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{
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ScrollBar *sb = scrollBar( Qt::Vertical );
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sb->setPalette( plot()->palette() );
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sb->setInverted( !plot()->axisScaleDiv( yAxis ).isIncreasing() );
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sb->setBase( zoomBase().top(), zoomBase().bottom() );
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sb->moveSlider( zoomRect().top(), zoomRect().bottom() );
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if ( !sb->isVisibleTo( canvas() ) )
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{
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sb->show();
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layout->setCanvasMargin( layout->canvasMargin( yScrollBarAxis )
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+ sb->extent(), yScrollBarAxis );
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}
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}
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else
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{
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if ( verticalScrollBar() )
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{
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verticalScrollBar()->hide();
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layout->setCanvasMargin( layout->canvasMargin( yScrollBarAxis )
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- verticalScrollBar()->extent(), yScrollBarAxis );
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}
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}
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if ( showHScrollBar && showVScrollBar )
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{
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if ( d_cornerWidget == NULL )
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{
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d_cornerWidget = new QWidget( canvas() );
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d_cornerWidget->setAutoFillBackground( true );
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d_cornerWidget->setPalette( plot()->palette() );
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}
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d_cornerWidget->show();
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}
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else
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{
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if ( d_cornerWidget )
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d_cornerWidget->hide();
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}
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layoutScrollBars( canvas()->contentsRect() );
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plot()->updateLayout();
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}
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void ScrollZoomer::layoutScrollBars( const QRect &rect )
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{
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int hPos = xAxis();
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if ( hScrollBarPosition() == OppositeToScale )
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hPos = oppositeAxis( hPos );
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int vPos = yAxis();
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if ( vScrollBarPosition() == OppositeToScale )
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vPos = oppositeAxis( vPos );
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ScrollBar *hScrollBar = horizontalScrollBar();
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ScrollBar *vScrollBar = verticalScrollBar();
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const int hdim = hScrollBar ? hScrollBar->extent() : 0;
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const int vdim = vScrollBar ? vScrollBar->extent() : 0;
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if ( hScrollBar && hScrollBar->isVisible() )
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{
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int x = rect.x();
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int y = ( hPos == QwtPlot::xTop )
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? rect.top() : rect.bottom() - hdim + 1;
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int w = rect.width();
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if ( vScrollBar && vScrollBar->isVisible() )
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{
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if ( vPos == QwtPlot::yLeft )
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x += vdim;
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w -= vdim;
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}
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hScrollBar->setGeometry( x, y, w, hdim );
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}
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if ( vScrollBar && vScrollBar->isVisible() )
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{
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int pos = yAxis();
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if ( vScrollBarPosition() == OppositeToScale )
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pos = oppositeAxis( pos );
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int x = ( vPos == QwtPlot::yLeft )
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? rect.left() : rect.right() - vdim + 1;
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int y = rect.y();
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int h = rect.height();
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if ( hScrollBar && hScrollBar->isVisible() )
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{
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if ( hPos == QwtPlot::xTop )
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y += hdim;
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h -= hdim;
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}
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vScrollBar->setGeometry( x, y, vdim, h );
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}
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if ( hScrollBar && hScrollBar->isVisible() &&
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vScrollBar && vScrollBar->isVisible() )
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{
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if ( d_cornerWidget )
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{
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QRect cornerRect(
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vScrollBar->pos().x(), hScrollBar->pos().y(),
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vdim, hdim );
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d_cornerWidget->setGeometry( cornerRect );
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}
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}
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}
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void ScrollZoomer::scrollBarMoved(
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Qt::Orientation o, double min, double max )
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{
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Q_UNUSED( max );
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if ( o == Qt::Horizontal )
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moveTo( QPointF( min, zoomRect().top() ) );
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else
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moveTo( QPointF( zoomRect().left(), min ) );
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Q_EMIT zoomed( zoomRect() );
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}
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int ScrollZoomer::oppositeAxis( int axis ) const
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{
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switch( axis )
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{
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case QwtPlot::xBottom:
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return QwtPlot::xTop;
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case QwtPlot::xTop:
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return QwtPlot::xBottom;
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case QwtPlot::yLeft:
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return QwtPlot::yRight;
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case QwtPlot::yRight:
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return QwtPlot::yLeft;
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default:
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break;
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}
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return axis;
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}
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