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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/***************************************************************************
* collapser.cc
*
* Mon Sep 15 09:48:46 CEST 2008
* Copyright 2008 Bent Bisballe Nyeng
* deva@aasimon.org
****************************************************************************/
/*
* This file is part of Pracro.
*
* Pracro 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.
*
* Pracro 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 Pracro; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*/
#include "collapser.h"
#include <QApplication>
#include <QHBoxLayout>
#include <QPainter>
#include <QLabel>
#include "debug.h"
#define ANIM_TIME 100 // ms
#define ANIM_INTERVAL 50 // ms
Collapser::Collapser(QWidget *current, QScrollArea *scroll)
{
current_widget = current;
scrollarea = scroll;
timer = new QTimer(this);
timer->setSingleShot(true);
timer->setInterval(ANIM_INTERVAL);
connect(timer, SIGNAL(timeout()), this, SLOT(anim()));
setLayout(new QHBoxLayout());
layout()->setContentsMargins(0,0,0,0);
connect(this, SIGNAL(scrollToViewSignal()),
this, SLOT(scrollToView()), Qt::QueuedConnection);
}
void Collapser::updateHeight()
{
int height = 16;
if(current_widget) {
QSize sz = current_widget->minimumSizeHint();
height = sz.height();
}
setFixedHeight(height);
}
QWidget *Collapser::currentWidget()
{
return current_widget;
}
void Collapser::animateToWidget(QWidget *widget, bool stv)
{
if(widget == current_widget) return;
emit animating(widget);
scroll_to_view = stv;
t_anim.start();
placeholder.grabFrom(current_widget);
if(current_widget) {
current_widget->setVisible(false);
layout()->removeWidget(current_widget);
}
placeholder.grabTo(widget);
if(widget) {
layout()->addWidget(&placeholder);
placeholder.setVisible(true);
}
current_widget = widget;
timer->start();
}
void Collapser::scrollToView()
{
if(scroll_to_view && scrollarea && current_widget) {
scrollarea->ensureWidgetVisible(current_widget);
}
}
void Collapser::anim()
{
double x = (double)(t_anim.elapsed()) / (double)ANIM_TIME;
double y = 1;
if(x < 1) {
y = x * x * x;
placeholder.setWeight(x);
// Make sure we don't 'bounce' around when animating to the same height.
int height;
if(placeholder.fromHeight() == placeholder.toHeight()) {
height = placeholder.toHeight();
} else {
height = (int)((1 - y) * placeholder.fromHeight() +
y * placeholder.toHeight());
}
setFixedHeight(height);
timer->start();
} else {
placeholder.setVisible(false);
layout()->removeWidget(&placeholder);
if(current_widget) {
layout()->addWidget(current_widget);
current_widget->setVisible(true);
}
setFixedHeight(placeholder.toHeight());
emit doneAnimating(current_widget);
emit scrollToViewSignal();
}
}
void Collapser::Placeholder::paintEvent(QPaintEvent *)
{
QPainter p(this);
p.setOpacity(1 - weight);
p.drawPixmap(rect(), pixmap_from, pixmap_from.rect());
p.setOpacity(weight);
p.drawPixmap(rect(), pixmap_to, pixmap_to.rect());
}
static QPixmap grab(QWidget *w, int &height, int width)
{
QPixmap pix;
QLabel lbl;
if(w == NULL) {
w = &lbl;
}
QSize sz = w->minimumSizeHint();
sz.setWidth(width);
w->resize(sz);
pix = QPixmap::grabWidget(w, 0, 0);
height = sz.height();
return pix;
}
void Collapser::Placeholder::grabFrom(QWidget *w)
{
weight = 0; // Reset
pixmap_from = grab(w, from_height, width());
}
void Collapser::Placeholder::grabTo(QWidget *w)
{
weight = 0; // Reset
pixmap_to = grab(w, to_height, width());
}
void Collapser::Placeholder::setWeight(double w)
{
weight = w * w * w;
}
int Collapser::Placeholder::fromHeight()
{
return from_height;
}
int Collapser::Placeholder::toHeight()
{
return to_height;
}
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