author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Mon, 19 Apr 2010 14:02:13 +0300 | |
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permissions | -rw-r--r-- |
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/**************************************************************************** |
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** |
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** Copyright (C) 2008-2010 Nokia Corporation and/or its subsidiary(-ies). |
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** All rights reserved. |
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** Contact: Nokia Corporation (developer.feedback@nokia.com) |
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** |
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** This file is part of the HbCore module of the UI Extensions for Mobile. |
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** |
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** GNU Lesser General Public License Usage |
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** This file may be used under the terms of the GNU Lesser General Public |
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** License version 2.1 as published by the Free Software Foundation and |
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** appearing in the file LICENSE.LGPL included in the packaging of this file. |
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** Please review the following information to ensure the GNU Lesser General |
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** Public License version 2.1 requirements will be met: |
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** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. |
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** |
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** In addition, as a special exception, Nokia gives you certain additional |
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** rights. These rights are described in the Nokia Qt LGPL Exception |
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. |
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** |
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** If you have questions regarding the use of this file, please contact |
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** Nokia at developer.feedback@nokia.com. |
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** |
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****************************************************************************/ |
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#include "hbtapandholdgesture.h" |
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#include "hbtapandholdgesture_p.h" |
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#include "hbtapandholdgesturerecognizer_p.h" |
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#include <QWidget> |
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#include <QGesture> |
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#include <QEvent> |
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#include <QVariant> |
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#include <QGraphicsSceneEvent> |
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#include <QDebug> |
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/*! |
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\internal |
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\class HbTapAndHoldGestureRecognizer |
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\brief HbTapAndHoldGestureRecognizer implements a gesture for tap and hold. |
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*/ |
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/*! |
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\internal |
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\brief Default constructor. |
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*/ |
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HbTapAndHoldGestureRecognizer::HbTapAndHoldGestureRecognizer() |
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: |
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QGestureRecognizer() |
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{ |
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} |
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/*! |
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\internal |
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\brief Create new gesture object. |
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\param target Associated target. |
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*/ |
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QGesture* HbTapAndHoldGestureRecognizer::create(QObject* /*target*/) |
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{ |
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return new HbTapAndHoldGesture; |
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} |
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/*! |
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\internal |
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\brief Handle mouse press event. |
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\return State change information. |
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Mouse press event only needs to record the location and start short timer |
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before triggering. |
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*/ |
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QGestureRecognizer::Result HbTapAndHoldGestureRecognizer::HandleGraphicsSceneMousePress( |
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HbTapAndHoldGesture& gesture ) |
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{ |
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// Last position is automatically recorded before this event call. |
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// Press event only means, that gesture is starting, thus last position is |
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// also the starting position. |
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gesture.setProperty("startPos", gesture.property("position")); |
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gesture.priv->mTimerID = startTimer(gesture, HOLDTAP_ACTIVATION_USECS); |
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gesture.setHotSpot(gesture.property("startPos").toPointF()); |
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return QGestureRecognizer::MayBeGesture; |
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} |
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/*! |
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\internal |
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\brief Handle mouse move event. |
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\return State change information. |
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Mousemove -event should cancel the gesture, when finger has moved outside |
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the threshold. |
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*/ |
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QGestureRecognizer::Result HbTapAndHoldGestureRecognizer::HandleGraphicsSceneMouseMove( |
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HbTapAndHoldGesture& gesture ) |
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{ |
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// In case timer is not running, just cancel gesture.priv-> This is an unknown state. |
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if ( !gesture.priv->mRunningTime ) return QGestureRecognizer::CancelGesture; |
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// Makes sure that finger remains inside the movement threshold. |
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if ( gesture.outsideThreshold() ) |
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{ |
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// Finger has moved outside, so reset and cancel this gesture.priv-> |
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reset(&gesture); |
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return QGestureRecognizer::CancelGesture; |
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105 |
} |
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106 |
|
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107 |
// Move events should be just ignored. |
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108 |
return QGestureRecognizer::Ignore; |
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109 |
} |
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110 |
|
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111 |
/*! |
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112 |
\internal |
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\brief Handles mouse release event. |
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\return State change information. |
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115 |
|
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When release happens, any timer running dictates, whether the gesture |
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should be considered as cancelled or finished. Both events needs to be |
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sent, so that UI may react correctly. |
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*/ |
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120 |
QGestureRecognizer::Result HbTapAndHoldGestureRecognizer::HandleGraphicsSceneMouseRelease( |
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HbTapAndHoldGesture& gesture ) |
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122 |
{ |
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// Check if the gesture is already been cancelled. This is an unknown state. |
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if ( !gesture.priv->mRunningTime ) return QGestureRecognizer::CancelGesture; |
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125 |
|
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// If release happens, before timer has expired, cancel the gesture.priv-> |
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if ( gesture.priv->mTimerID ) |
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128 |
{ |
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reset(&gesture); |
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return QGestureRecognizer::CancelGesture; |
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131 |
} |
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132 |
else |
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133 |
{ |
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// Gesture has succesfully executed. Reward the UI with finished event. |
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gesture.priv->mTimerID = 0; |
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gesture.priv->mRunningTime = 0; |
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return QGestureRecognizer::FinishGesture; |
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138 |
} |
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139 |
} |
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140 |
|
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141 |
/*! |
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142 |
\internal |
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\brief Handle timer event. |
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\return State change information. |
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145 |
|
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Timer is a heart of the tap and hold gesture and dictates its |
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behavior. There are three phases: not started - started - finished. |
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148 |
When the timer event is invoked, the state of the gesture is changed |
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and the timer event is consumed. |
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150 |
|
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\see HbTapAndHoldGestureRecognizer::HandleGesture() |
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152 |
*/ |
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153 |
QGestureRecognizer::Result HbTapAndHoldGestureRecognizer::HandleTimer( |
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154 |
HbTapAndHoldGesture& gesture, |
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155 |
QEvent& event) |
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156 |
{ |
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// React only to own timer event, please. |
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if ( gesture.priv->mTimerID == GetTimerID(event) ) |
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159 |
{ |
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// Handle the event and consume the timer event as it doesn't belong |
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// to anybody else. |
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return HandleGesture(gesture) | QGestureRecognizer::ConsumeEventHint; |
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163 |
} |
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164 |
else |
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165 |
{ |
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166 |
// Not our business. |
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167 |
return QGestureRecognizer::Ignore; |
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168 |
} |
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169 |
} |
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170 |
|
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171 |
/*! |
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172 |
\internal |
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\brief Handle event invoked by the timer. |
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\return State change information. |
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175 |
|
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176 |
Changes the hold and tap -gestures state, dictated by the expired timer. |
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177 |
Changes the state from Not started to started and from started to finished. |
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178 |
|
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\see HbTapAndHoldGestureRecognizer::HandleTimer() |
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180 |
*/ |
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181 |
QGestureRecognizer::Result HbTapAndHoldGestureRecognizer::HandleGesture( |
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182 |
HbTapAndHoldGesture& gesture) |
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183 |
{ |
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184 |
switch ( gesture.priv->mRunningTime ) |
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185 |
{ |
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// Time to invoke the started event. |
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case HOLDTAP_ACTIVATION_USECS: |
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gesture.priv->mTimerID = startTimer(gesture, HOLDTAP_DURATION_USECS); |
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189 |
return QGestureRecognizer::TriggerGesture; |
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190 |
|
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191 |
// Time to invoke finish event. |
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192 |
case HOLDTAP_DURATION_USECS: |
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gesture.priv->mTimerID = 0; |
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194 |
return QGestureRecognizer::FinishGesture; |
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195 |
|
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196 |
default: break; |
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197 |
} |
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198 |
|
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199 |
return QGestureRecognizer::Ignore; |
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200 |
} |
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201 |
|
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202 |
/*! |
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203 |
\internal |
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\brief Checks whether the events needs to be reacted or not |
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\param event Event to be analyzed. |
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\return True, if the event is mouse event or timer event, otherwise False. |
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207 |
*/ |
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208 |
bool HbTapAndHoldGestureRecognizer::IsInterestingEvent(QEvent& event) |
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209 |
{ |
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210 |
return ( event.type() >= QEvent::GraphicsSceneMouseMove && |
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event.type() <= QEvent::GraphicsSceneMouseRelease ) || |
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event.type() == QEvent::Timer; |
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} |
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/*! |
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\internal |
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\brief Retrieves the timer event from the event from the event. |
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\param event Event for investigation. |
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\return Valid timer ID |
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*/ |
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int HbTapAndHoldGestureRecognizer::GetTimerID(QEvent& event) |
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{ |
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// It is already safe to presume the event is timer event, because |
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// the test is already made. |
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QTimerEvent* te = static_cast<QTimerEvent*>(&event); |
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return te->timerId(); |
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} |
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/*! |
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\internal |
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\brief Recognizes and handles events and converts them to gesture events. |
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\param state Associated gesture.priv-> |
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\param watched Object that needs attention. |
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\param event Event invoked the this function call. |
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\return State change information. |
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\relates QGestureRecognizer |
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*/ |
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QGestureRecognizer::Result HbTapAndHoldGestureRecognizer::recognize( |
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QGesture *state, QObject * /*watched*/, QEvent *event) |
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{ |
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// Don't even try to handle cases, when any of the pointers is NULL. |
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if (!state || !event) return QGestureRecognizer::Ignore; |
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// Ignore events which are not gesture events. |
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if ( !IsInterestingEvent(*event) ) return QGestureRecognizer::Ignore; |
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|
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HbTapAndHoldGesture& gesture = *static_cast<HbTapAndHoldGesture*>(state); |
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gesture.update(*event); |
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|
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QGestureRecognizer::Result result(QGestureRecognizer::Ignore); |
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switch (event->type()) { |
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case QEvent::GraphicsSceneMousePress: return HandleGraphicsSceneMousePress(gesture); |
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case QEvent::GraphicsSceneMouseRelease: return HandleGraphicsSceneMouseRelease(gesture); |
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case QEvent::GraphicsSceneMouseMove: return HandleGraphicsSceneMouseMove(gesture); |
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case QEvent::Timer: return HandleTimer(gesture, *event); |
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|
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case QEvent::TouchBegin: |
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case QEvent::TouchUpdate: |
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case QEvent::TouchEnd: return QGestureRecognizer::Ignore; |
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default: break; |
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} |
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return QGestureRecognizer::Ignore; |
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} |
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|
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/*! |
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\internal |
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\brief Clears all values for recognizer and gesture.priv-> |
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\param state Associated gesture.priv-> |
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\relates QGestureRecognizer |
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*/ |
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void HbTapAndHoldGestureRecognizer::reset(QGesture *state) |
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{ |
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QGestureRecognizer::reset(state); |
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HbTapAndHoldGesture& gesture = *static_cast<HbTapAndHoldGesture*>(state); |
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if ( gesture.priv->mTimerID ) |
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{ |
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gesture.killTimer(gesture.priv->mTimerID); |
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} |
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|
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gesture.setProperty("startPos", QVariant()); |
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gesture.setProperty("tapRadius", QVariant()); |
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gesture.priv->mTimerID = 0; |
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gesture.priv->mRunningTime = 0; |
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} |
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/*! |
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\internal |
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\brief Starts brand new timer. |
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\param msecs Timer runtime in microseconds |
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\return ID of the timer |
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*/ |
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int HbTapAndHoldGestureRecognizer::startTimer( |
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HbTapAndHoldGesture& gesture, |
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int msecs) |
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{ |
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gesture.priv->mRunningTime = msecs; |
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return gesture.startTimer(msecs); |
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} |
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301 |