panelswitcher.cpp

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#include "panelswitcher.h"
#include <qapplication.h>
#include <qlayout.h>
#include <qobjectlist.h>
#include <qpixmap.h>
#include <qtimer.h>
#include <stdio.h>


CachingWidget::CachingWidget(QWidget *parent, const char *name)
	: QWidget(parent, name) {

	setBackgroundMode(NoBackground);
}

void CachingWidget::setCached(bool enable) {
	if(enable) {
		m_buffer= QPixmap::grabWidget(this);

		QObjectList *l= queryList("QWidget");
		QObjectListIt it(*l);
		QObject *obj;
		while((obj= it.current()) != NULL) {
			((QWidget*) obj)->hide();
			++it;
		}
		delete l;

	} else {
		m_buffer.resize(0, 0);

		QObjectList *l= queryList("QWidget");
		QObjectListIt it(*l);
		QObject *obj;
		while((obj= it.current()) != NULL) {
			((QWidget*) obj)->show();
			++it;
		}
		delete l;
	}
}

void CachingWidget::paintEvent(QPaintEvent *evt) {
	if(!m_buffer.isNull()) {
		QPainter p(this);
		p.drawPixmap(evt->rect().topLeft(), m_buffer, evt->rect());
	}
}

void CachingWidget::resizeEvent(QResizeEvent*) {
	setCached(false);
}

//--------------------------------//

PanelSwitcher::PanelSwitcher(QWidget *parent, const char *name)
	: QScrollView(parent, name)
	, m_curpanel(0)
	, m_oldpanel(0) {

	setVScrollBarMode(AlwaysOff);
	setHScrollBarMode(AlwaysOff);

	setFrameStyle(NoFrame);
}

void PanelSwitcher::showPanel(int index) {
	m_oldpanel= m_curpanel;
	m_curpanel= index;
	if(m_entries.at(m_curpanel) != NULL) {
		m_entries.at(m_curpanel)->setFocus();
		emit panelChanged();
	
		if(m_oldpanel != m_curpanel) {
			if(m_entries.at(m_oldpanel) != NULL && m_entries.at(m_oldpanel)->isA("CachingWidget")) {
				((CachingWidget*) m_entries.at(m_oldpanel))->show();
				((CachingWidget*) m_entries.at(m_oldpanel))->setCached(true);
			}
		
			if(m_entries.at(m_curpanel) != NULL && m_entries.at(m_curpanel)->isA("CachingWidget")) {
				((CachingWidget*) m_entries.at(m_curpanel))->show();
				((CachingWidget*) m_entries.at(m_curpanel))->setCached(true);
			}
		
			animate();
		}
	}
}

void PanelSwitcher::animate() {
	int ofsa, ofsb;
	for(int i= 0; i < 16; i++) {
		ofsa= contentsX();
		ofsb= m_curpanel* width();
	
		if(ofsa == ofsb)
			return;
	
		if(ofsa < ofsb) {
			ofsa+= 20;
			if(ofsa > ofsb)
				ofsa= ofsb;
		}
		if(ofsa > ofsb) {
			ofsa-= 20;
			if(ofsa < ofsb)
				ofsa= ofsb;
		}
		setContentsPos(ofsa, 0);

		if(ofsa == ofsb)
			break;
	}

	if(ofsa != ofsb) {
		QTimer::singleShot(0, this, SLOT(animate()));
		qApp->processOneEvent();

	} else {
		if(m_entries.at(m_oldpanel)!= NULL && m_entries.at(m_oldpanel)->isA("CachingWidget"))
			((CachingWidget*) m_entries.at(m_oldpanel))->setCached(false);
	
		if(m_entries.at(m_curpanel) != NULL && m_entries.at(m_curpanel)->isA("CachingWidget"))
			((CachingWidget*) m_entries.at(m_curpanel))->setCached(false);
	}
}

int PanelSwitcher::visibleIndex() const {
	return m_curpanel;
}

QWidget* PanelSwitcher::visiblePanel() {
	return m_entries.at(m_curpanel);
}

QWidget* PanelSwitcher::panelAt(int index) {
	return m_entries.at(index);
}

void PanelSwitcher::addPanel(QWidget *panel, uint index) {
	for(uint i= 0; i < index; i++)
		if(i >= m_entries.count())
			m_entries.append(NULL);
	m_entries.insert(index, panel);
	resizeContents(m_entries.count()* width(), height());

	addChild(panel, index* width(), 0);
	panel->resize(width(), height());
	panel->show();
}

void PanelSwitcher::resizeEvent(QResizeEvent *evt) {
	QScrollView::resizeEvent(evt);

	for(uint i= 0; i < m_entries.count(); i++) {
		if(m_entries.at(i) != NULL)
			m_entries.at(i)->setGeometry(i* width(), 0, width(), height());
	}
	resizeContents(m_entries.count()* width(), height());
	setContentsPos(m_curpanel* width(), 0);
}