--- a/ginebra/flickcharm.cpp Fri Jun 11 16:23:26 2010 +0100
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,313 +0,0 @@
-/*
-* Copyright (c) 2008 Nokia Corporation and/or its subsidiary(-ies).
-* All rights reserved.
-* This component and the accompanying materials are made available
-* under the terms of "Eclipse Public License v1.0"
-* which accompanies this distribution, and is available
-* at the URL "http://www.eclipse.org/legal/epl-v10.html".
-*
-* Initial Contributors:
-* Nokia Corporation - initial contribution.
-*
-* Contributors:
-*
-* Description:
-*
-*/
-
-
-#include "flickcharm.h"
-
-#include <QAbstractScrollArea>
-#include <QApplication>
-#include <QBasicTimer>
-#include <QEvent>
-#include <QHash>
-#include <QList>
-#include <QMouseEvent>
-#include <QScrollBar>
-#include "qwebframe.h"
-#include "qwebview.h"
-
-#include <QDebug>
-
-struct FlickData {
- typedef enum { Steady, Pressed, ManualScroll, AutoScroll, Stop } State;
- State state;
- QWidget *widget;
- QPoint pressPos;
- QPoint offset;
- QPoint dragPos;
- QPoint speed;
- QList<QEvent*> ignored;
-};
-
-class FlickCharmPrivate
-{
-public:
- QHash<QWidget*, FlickData*> flickData;
- QBasicTimer ticker;
-};
-
-FlickCharm::FlickCharm(QObject *parent): QObject(parent)
-{
- d = new FlickCharmPrivate;
-}
-
-FlickCharm::~FlickCharm()
-{
- delete d;
-}
-
-void FlickCharm::activateOn(QWidget *widget)
-{
- QAbstractScrollArea *scrollArea = dynamic_cast<QAbstractScrollArea*>(widget);
- if (scrollArea) {
- scrollArea->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
- scrollArea->setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
-
- QWidget *viewport = scrollArea->viewport();
-
- viewport->installEventFilter(this);
- scrollArea->installEventFilter(this);
-
- d->flickData.remove(viewport);
- d->flickData[viewport] = new FlickData;
- d->flickData[viewport]->widget = widget;
- d->flickData[viewport]->state = FlickData::Steady;
-
- return;
- }
-
- QWebView *webView = dynamic_cast<QWebView*>(widget);
- if (webView) {
- QWebFrame *frame = webView->page()->mainFrame();
- frame->setScrollBarPolicy(Qt::Vertical, Qt::ScrollBarAlwaysOff);
- frame->setScrollBarPolicy(Qt::Horizontal, Qt::ScrollBarAlwaysOff);
-
- webView->installEventFilter(this);
-
- d->flickData.remove(webView);
- d->flickData[webView] = new FlickData;
- d->flickData[webView]->widget = webView;
- d->flickData[webView]->state = FlickData::Steady;
-
- return;
- }
-
- qWarning() << "FlickCharm only works on QAbstractScrollArea (and derived classes)";
- qWarning() << "or QWebView (and derived classes)";
-}
-
-void FlickCharm::deactivateFrom(QWidget *widget)
-{
- QAbstractScrollArea *scrollArea = dynamic_cast<QAbstractScrollArea*>(widget);
- if (scrollArea) {
- QWidget *viewport = scrollArea->viewport();
-
- viewport->removeEventFilter(this);
- scrollArea->removeEventFilter(this);
-
- delete d->flickData[viewport];
- d->flickData.remove(viewport);
-
- return;
- }
-
- QWebView *webView = dynamic_cast<QWebView*>(widget);
- if (webView) {
- webView->removeEventFilter(this);
-
- delete d->flickData[webView];
- d->flickData.remove(webView);
-
- return;
- }
-}
-
-static QPoint scrollOffset(QWidget *widget)
-{
- int x = 0, y = 0;
-
- QAbstractScrollArea *scrollArea = dynamic_cast<QAbstractScrollArea*>(widget);
- if (scrollArea) {
- x = scrollArea->horizontalScrollBar()->value();
- y = scrollArea->verticalScrollBar()->value();
- }
-
- QWebView *webView = dynamic_cast<QWebView*>(widget);
- if (webView) {
- QWebFrame *frame = webView->page()->mainFrame();
- x = frame->evaluateJavaScript("window.scrollX").toInt();
- y = frame->evaluateJavaScript("window.scrollY").toInt();
- }
-
- return QPoint(x, y);
-}
-
-static void setScrollOffset(QWidget *widget, const QPoint &p)
-{
- QAbstractScrollArea *scrollArea = dynamic_cast<QAbstractScrollArea*>(widget);
- if (scrollArea) {
- scrollArea->horizontalScrollBar()->setValue(p.x());
- scrollArea->verticalScrollBar()->setValue(p.y());
- }
-
- widget->update(); // hab - added to force repainting of overlapping widgets.
-
- QWebView *webView = dynamic_cast<QWebView*>(widget);
- QWebFrame *frame = webView ? webView->page()->mainFrame() : 0;
- if (frame)
- frame->evaluateJavaScript(QString("window.scrollTo(%1,%2);").arg(p.x()).arg(p.y()));
-}
-
-static QPoint deaccelerate(const QPoint &speed, int a = 1, int max = 64)
-{
- int x = qBound(-max, speed.x(), max);
- int y = qBound(-max, speed.y(), max);
- x = (x == 0) ? x : (x > 0) ? qMax(0, x - a) : qMin(0, x + a);
- y = (y == 0) ? y : (y > 0) ? qMax(0, y - a) : qMin(0, y + a);
- return QPoint(x, y);
-}
-
-bool FlickCharm::eventFilter(QObject *object, QEvent *event)
-{
-
- if (!object->isWidgetType())
- return false;
-
- QEvent::Type type = event->type();
- if (type != QEvent::MouseButtonPress &&
- type != QEvent::MouseButtonRelease &&
- type != QEvent::MouseMove)
- return false;
-
- QMouseEvent *mouseEvent = dynamic_cast<QMouseEvent*>(event);
- if (!mouseEvent || mouseEvent->modifiers() != Qt::NoModifier)
- return false;
-
- QWidget *viewport = dynamic_cast<QWidget*>(object);
- FlickData *data = d->flickData.value(viewport);
- if (!viewport || !data || data->ignored.removeAll(event))
- return false;
-
- if (type == QEvent::MouseMove){
- //Throw away spurious mouse moves on mac
- if(data->pressPos == mouseEvent->pos()){
- return false;
- }
- }
- bool consumed = false;
- switch (data->state) {
-
- case FlickData::Steady:
-
- if (mouseEvent->type() == QEvent::MouseButtonPress)
- if (mouseEvent->buttons() == Qt::LeftButton) {
- consumed = true;
- data->state = FlickData::Pressed;
- data->pressPos = mouseEvent->pos();
- data->offset = scrollOffset(data->widget);
- }
- break;
-
- case FlickData::Pressed:
-
- if (mouseEvent->type() == QEvent::MouseButtonRelease) {
- consumed = true;
- data->state = FlickData::Steady;
-
- QMouseEvent *event1 = new QMouseEvent(QEvent::MouseButtonPress,
- data->pressPos, Qt::LeftButton,
- Qt::LeftButton, Qt::NoModifier);
- QMouseEvent *event2 = new QMouseEvent(*mouseEvent);
-
- data->ignored << event1;
- data->ignored << event2;
- QApplication::postEvent(object, event1);
- QApplication::postEvent(object, event2);
- }
- if (mouseEvent->type() == QEvent::MouseMove) {
- consumed = true;
- data->state = FlickData::ManualScroll;
- data->dragPos = QCursor::pos();
- if (!d->ticker.isActive())
- d->ticker.start(20, this);
- }
- break;
-
- case FlickData::ManualScroll:
- if (mouseEvent->type() == QEvent::MouseMove) {
- consumed = true;
- QPoint delta = mouseEvent->pos() - data->pressPos;
- setScrollOffset(data->widget, data->offset - delta);
- }
- if (mouseEvent->type() == QEvent::MouseButtonRelease) {
- consumed = true;
- data->state = FlickData::AutoScroll;
- }
- break;
-
- case FlickData::AutoScroll:
- if (mouseEvent->type() == QEvent::MouseButtonPress) {
- consumed = true;
- data->state = FlickData::Stop;
- data->speed = QPoint(0, 0);
- }
- if (mouseEvent->type() == QEvent::MouseButtonRelease) {
- consumed = true;
- data->state = FlickData::Steady;
- data->speed = QPoint(0, 0);
- }
- break;
-
- case FlickData::Stop:
- if (mouseEvent->type() == QEvent::MouseButtonRelease) {
- consumed = true;
- data->state = FlickData::Steady;
- }
- if (mouseEvent->type() == QEvent::MouseMove) {
- consumed = true;
- data->state = FlickData::ManualScroll;
- data->dragPos = QCursor::pos();
- if (!d->ticker.isActive())
- d->ticker.start(20, this);
- }
- break;
-
- default:
- break;
- }
-
- return consumed;
-}
-
-void FlickCharm::timerEvent(QTimerEvent *event)
-{
- int count = 0;
- QHashIterator<QWidget*, FlickData*> item(d->flickData);
- while (item.hasNext()) {
- item.next();
- FlickData *data = item.value();
-
- if (data->state == FlickData::ManualScroll) {
- count++;
- data->speed = QCursor::pos() - data->dragPos;
- data->dragPos = QCursor::pos();
- }
-
- if (data->state == FlickData::AutoScroll) {
- count++;
- data->speed = deaccelerate(data->speed);
- QPoint p = scrollOffset(data->widget);
- setScrollOffset(data->widget, p - data->speed);
- if (data->speed == QPoint(0, 0))
- data->state = FlickData::Steady;
- }
- }
-
- if (!count)
- d->ticker.stop();
-
- QObject::timerEvent(event);
-}