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1 /**************************************************************************** |
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2 ** |
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3 ** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies). |
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4 ** All rights reserved. |
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5 ** Contact: Nokia Corporation (qt-info@nokia.com) |
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6 ** |
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7 ** This file is part of the QtDeclarative module of the Qt Toolkit. |
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8 ** |
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9 ** $QT_BEGIN_LICENSE:LGPL$ |
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10 ** No Commercial Usage |
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11 ** This file contains pre-release code and may not be distributed. |
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12 ** You may use this file in accordance with the terms and conditions |
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13 ** contained in the Technology Preview License Agreement accompanying |
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14 ** this package. |
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15 ** |
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16 ** GNU Lesser General Public License Usage |
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17 ** Alternatively, this file may be used under the terms of the GNU Lesser |
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18 ** General Public License version 2.1 as published by the Free Software |
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19 ** Foundation and appearing in the file LICENSE.LGPL included in the |
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20 ** packaging of this file. Please review the following information to |
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21 ** ensure the GNU Lesser General Public License version 2.1 requirements |
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22 ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. |
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23 ** |
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24 ** In addition, as a special exception, Nokia gives you certain additional |
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25 ** rights. These rights are described in the Nokia Qt LGPL Exception |
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26 ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. |
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27 ** |
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28 ** If you have questions regarding the use of this file, please contact |
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29 ** Nokia at qt-info@nokia.com. |
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30 ** |
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31 ** |
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32 ** |
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33 ** |
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34 ** |
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35 ** |
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36 ** |
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37 ** |
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38 ** $QT_END_LICENSE$ |
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39 ** |
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40 ****************************************************************************/ |
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41 |
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42 #include "private/qdeclarativebehavior_p.h" |
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43 |
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44 #include "private/qdeclarativeanimation_p.h" |
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45 #include "private/qdeclarativetransition_p.h" |
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46 |
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47 #include <qdeclarativecontext.h> |
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48 #include <qdeclarativeinfo.h> |
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49 #include <qdeclarativeproperty_p.h> |
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50 #include <qdeclarativeguard_p.h> |
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51 #include <qdeclarativeengine_p.h> |
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52 |
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53 #include <private/qobject_p.h> |
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54 |
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55 QT_BEGIN_NAMESPACE |
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56 |
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57 class QDeclarativeBehaviorPrivate : public QObjectPrivate |
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58 { |
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59 Q_DECLARE_PUBLIC(QDeclarativeBehavior) |
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60 public: |
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61 QDeclarativeBehaviorPrivate() : animation(0), enabled(true), finalized(false) {} |
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62 |
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63 QDeclarativeProperty property; |
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64 QVariant currentValue; |
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65 QVariant targetValue; |
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66 QDeclarativeGuard<QDeclarativeAbstractAnimation> animation; |
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67 bool enabled; |
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68 bool finalized; |
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69 }; |
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70 |
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71 /*! |
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72 \qmlclass Behavior QDeclarativeBehavior |
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73 \since 4.7 |
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74 \brief The Behavior element allows you to specify a default animation for a property change. |
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75 |
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76 Behaviors provide one way to specify \l{qdeclarativeanimation.html}{animations} in QML. |
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77 |
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78 In the example below, the rectangle will use a bounce easing curve over 200 millisecond for any changes to its y property: |
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79 \code |
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80 Rectangle { |
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81 width: 20; height: 20 |
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82 color: "#00ff00" |
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83 y: 200 // initial value |
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84 Behavior on y { |
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85 NumberAnimation { |
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86 easing.type: Easing.OutBounce |
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87 easing.amplitude: 100 |
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88 duration: 200 |
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89 } |
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90 } |
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91 } |
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92 \endcode |
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93 |
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94 Currently only a single Behavior may be specified for a property; |
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95 this Behavior can be enabled and disabled via the \l{enabled} property. |
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96 |
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97 \sa QtDeclarative |
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98 */ |
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99 |
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100 |
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101 QDeclarativeBehavior::QDeclarativeBehavior(QObject *parent) |
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102 : QObject(*(new QDeclarativeBehaviorPrivate), parent) |
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103 { |
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104 } |
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105 |
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106 QDeclarativeBehavior::~QDeclarativeBehavior() |
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107 { |
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108 } |
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109 |
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110 /*! |
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111 \qmlproperty Animation Behavior::animation |
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112 \default |
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113 |
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114 The animation to use when the behavior is triggered. |
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115 */ |
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116 |
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117 QDeclarativeAbstractAnimation *QDeclarativeBehavior::animation() |
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118 { |
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119 Q_D(QDeclarativeBehavior); |
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120 return d->animation; |
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121 } |
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122 |
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123 void QDeclarativeBehavior::setAnimation(QDeclarativeAbstractAnimation *animation) |
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124 { |
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125 Q_D(QDeclarativeBehavior); |
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126 if (d->animation) { |
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127 qmlInfo(this) << tr("Cannot change the animation assigned to a Behavior."); |
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128 return; |
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129 } |
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130 |
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131 d->animation = animation; |
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132 if (d->animation) { |
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133 d->animation->setDefaultTarget(d->property); |
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134 d->animation->setDisableUserControl(); |
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135 } |
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136 } |
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137 |
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138 /*! |
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139 \qmlproperty bool Behavior::enabled |
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140 Whether the Behavior will be triggered when the property it is tracking changes. |
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141 |
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142 By default a Behavior is enabled. |
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143 */ |
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144 |
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145 bool QDeclarativeBehavior::enabled() const |
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146 { |
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147 Q_D(const QDeclarativeBehavior); |
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148 return d->enabled; |
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149 } |
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150 |
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151 void QDeclarativeBehavior::setEnabled(bool enabled) |
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152 { |
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153 Q_D(QDeclarativeBehavior); |
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154 if (d->enabled == enabled) |
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155 return; |
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156 d->enabled = enabled; |
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157 emit enabledChanged(); |
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158 } |
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159 |
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160 void QDeclarativeBehavior::write(const QVariant &value) |
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161 { |
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162 Q_D(QDeclarativeBehavior); |
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163 qmlExecuteDeferred(this); |
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164 if (!d->animation || !d->enabled || !d->finalized) { |
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165 QDeclarativePropertyPrivate::write(d->property, value, QDeclarativePropertyPrivate::BypassInterceptor | QDeclarativePropertyPrivate::DontRemoveBinding); |
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166 d->targetValue = value; |
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167 return; |
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168 } |
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169 |
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170 if (value == d->targetValue) |
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171 return; |
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172 |
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173 d->currentValue = d->property.read(); |
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174 d->targetValue = value; |
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175 |
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176 if (d->animation->qtAnimation()->duration() != -1) |
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177 d->animation->qtAnimation()->stop(); |
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178 |
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179 QDeclarativeStateOperation::ActionList actions; |
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180 QDeclarativeAction action; |
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181 action.property = d->property; |
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182 action.fromValue = d->currentValue; |
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183 action.toValue = value; |
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184 actions << action; |
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185 |
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186 QList<QDeclarativeProperty> after; |
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187 d->animation->transition(actions, after, QDeclarativeAbstractAnimation::Forward); |
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188 d->animation->qtAnimation()->start(); |
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189 if (!after.contains(d->property)) |
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190 QDeclarativePropertyPrivate::write(d->property, value, QDeclarativePropertyPrivate::BypassInterceptor | QDeclarativePropertyPrivate::DontRemoveBinding); |
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191 } |
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192 |
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193 void QDeclarativeBehavior::setTarget(const QDeclarativeProperty &property) |
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194 { |
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195 Q_D(QDeclarativeBehavior); |
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196 d->property = property; |
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197 d->currentValue = property.read(); |
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198 if (d->animation) |
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199 d->animation->setDefaultTarget(property); |
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200 |
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201 QDeclarativeEnginePrivate *engPriv = QDeclarativeEnginePrivate::get(qmlEngine(this)); |
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202 engPriv->registerFinalizedParserStatusObject(this, this->metaObject()->indexOfSlot("componentFinalized()")); |
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203 } |
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204 |
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205 void QDeclarativeBehavior::componentFinalized() |
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206 { |
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207 Q_D(QDeclarativeBehavior); |
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208 d->finalized = true; |
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209 } |
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210 |
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211 QT_END_NAMESPACE |