QML实现酷炫的 Cover Flow 效果（PathView）

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前言

在 QML 中的 PathView 来实现一个 Cover Flow 图片切换效果，非常酷炫，并且代码也非常精简，先来看看效果图

这里写图片描述

源代码

Rectangle {    id:coverflow    color:"black"    property ListModel model    property int itemCount: 5    PathView{        id:pathView        model:coverflow.model        delegate: Item {            id:delegateItem            width: 200            height: 200            z:PathView.iconZ            scale:PathView.iconScale            Image{                id:image                source: url                width: delegateItem.width                height: delegateItem.height            }            ShaderEffect {                anchors.top: image.bottom                width: image.width                height: image.height;                anchors.left: image.left                property variant source: image;                property size sourceSize: Qt.size(0.5 / image.width, 0.5 / image.height);                fragmentShader:                        "varying highp vec2 qt_TexCoord0;                        uniform lowp sampler2D source;                        uniform lowp vec2 sourceSize;                        uniform lowp float qt_Opacity;                        void main() {                            lowp vec2 tc = qt_TexCoord0 * vec2(1, -1) + vec2(0, 1);                            lowp vec4 col = 0.25 * (texture2D(source, tc + sourceSize) + texture2D(source, tc- sourceSize)                            + texture2D(source, tc + sourceSize * vec2(1, -1))                            + texture2D(source, tc + sourceSize * vec2(-1, 1)));                            gl_FragColor = col * qt_Opacity * (1.0 - qt_TexCoord0.y) * 0.2;                        }"            }            transform: Rotation{                origin.x:image.width/2.0                origin.y:image.height/2.0                axis{x:0;y:1;z:0}                angle: delegateItem.PathView.iconAngle            }        }        path:coverFlowPath        pathItemCount: coverflow.itemCount        anchors.fill: parent        preferredHighlightBegin: 0.5        preferredHighlightEnd: 0.5    }    Path{        id:coverFlowPath        startX: 0        startY: coverflow.height/3        PathAttribute{name:"iconZ";value: 0}        PathAttribute{name:"iconAngle";value: 70}        PathAttribute{name:"iconScale";value: 0.6}        PathLine{x:coverflow.width/2;y:coverflow.height/3}        PathAttribute{name:"iconZ";value: 100}        PathAttribute{name:"iconAngle";value: 0}        PathAttribute{name:"iconScale";value: 1.0}        PathLine{x:coverflow.width;y:coverflow.height/3}        PathAttribute{name:"iconZ";value: 0}        PathAttribute{name:"iconAngle";value: -70}        PathAttribute{name:"iconScale";value: 0.6}        PathPercent{value:1.0}    }}

这里用ShaderEffect来实现图片的阴影倒影效果，之前的博客里面有介绍
Path中主要通过修改图片的 Z 值、缩放、以及旋转来改变图片属性达到我们想要的效果。

源码在这里，点击下载

本文参考http://www.qter.org/portal.php?mod=view&aid=20

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