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import QtQuick 2.0
import Qt.labs.presentation 1.0
Presentation {
id: deck
width: 600
height: 400
property bool inTransition: false;
property variant fromSlide;
property variant toSlide;
property int transitionTime: 2000;
BackgroundSwirls {}
ShaderEffectItem {
id: effect
anchors.fill: parent
visible: deck.inTransition
property variant source: ShaderEffectSource {
sourceItem: fromSlide;
smooth: true
sourceRect: Qt.rect(-fromSlide.x, -fromSlide.y, parent.width, parent.height);
}
property real ratio: 0
property real alpha: Math.pow(1 - ratio, 5);
property real amplitude: 0.1 * ratio
property real frequency: 20
property real time: 0
NumberAnimation on time { loops: Animation.Infinite; from: 0; to: Math.PI * 2; duration: 3000 }
fragmentShader:
"uniform highp float amplitude;" +
"uniform highp float frequency;" +
"uniform highp float time;" +
"uniform lowp float ratio;" +
"uniform lowp float alpha;" +
"uniform sampler2D source;" +
"varying highp vec2 qt_TexCoord0;" +
"void main() {" +
" highp vec2 p = sin(time + frequency * qt_TexCoord0);" +
" gl_FragColor = texture2D(source, qt_TexCoord0 + amplitude * vec2(p.y, -p.x)) * alpha;" +
"}"
}
SequentialAnimation {
id: transition
ScriptAction { script: {
deck.inTransition = true
fromSlide.opacity = 0
toSlide.visible = true
}
}
ParallelAnimation {
NumberAnimation { target: effect; property: "ratio"; from: 0; to: 1; duration: deck.transitionTime; easing.type: Easing.InQuad }
NumberAnimation { target: toSlide; property: "opacity"; from: 0; to: 1; duration: deck.transitionTime; easing.type: Easing.InQuart }
}
ScriptAction { script: {
deck.inTransition = false
fromSlide.visible = false
fromSlide.opacity = 0
toSlide.opacity = 1
}
}
}
function switchSlides(from, to)
{
if (deck.inTransition)
return false
deck.fromSlide = from
deck.toSlide = to
transition.running = true;
return true
}
}
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