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<h1 class="title">FlipBar.qml Example File</h1>
<span class="subtitle">demos/tweetsearch/content/FlipBar.qml</span>
<!-- $$$demos/tweetsearch/content/FlipBar.qml-description -->
<div class="descr"> <a name="details"></a>
<pre class="qml">
<span class="comment">/****************************************************************************
**
** Copyright (C) 2017 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** BSD License Usage
** Alternatively, you may use this file under the terms of the BSD license
** as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
** * Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** * Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in
** the documentation and/or other materials provided with the
** distribution.
** * Neither the name of The Qt Company Ltd nor the names of its
** contributors may be used to endorse or promote products derived
** from this software without specific prior written permission.
**
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
**
** $QT_END_LICENSE$
**
****************************************************************************/</span>
import QtQuick 2.0
<span class="type"><a href="qml-qtquick-item.html">Item</a></span> {
<span class="name">id</span>: <span class="name">container</span>
property <span class="type">int</span> <span class="name">animDuration</span>: <span class="number">300</span>
property <span class="type"><a href="qml-qtquick-item.html">Item</a></span> <span class="name">front</span>: <span class="name">Item</span> {}
property <span class="type"><a href="qml-qtquick-item.html">Item</a></span> <span class="name">back</span>: <span class="name">Item</span> {}
property <span class="type">real</span> <span class="name">factor</span>: <span class="number">0.1</span> <span class="comment">// amount the edges fold in for the 3D effect</span>
property <span class="type">alias</span> <span class="name">delta</span>: <span class="name">effect</span>.<span class="name">delta</span>
property <span class="type"><a href="qml-qtquick-item.html">Item</a></span> <span class="name">cur</span>: <span class="name">frontShown</span> ? <span class="name">front</span> : <span class="name">back</span>
property <span class="type"><a href="qml-qtquick-item.html">Item</a></span> <span class="name">noncur</span>: <span class="name">frontShown</span> ? <span class="name">back</span> : <span class="name">front</span>
<span class="keyword">function</span> <span class="name">swap</span>() {
var <span class="name">tmp</span> = <span class="name">front</span>;
<span class="name">front</span> <span class="operator">=</span> <span class="name">back</span>;
<span class="name">back</span> <span class="operator">=</span> <span class="name">tmp</span>;
<span class="name">resync</span>();
}
<span class="name">width</span>: <span class="name">cur</span>.<span class="name">width</span>
<span class="name">height</span>: <span class="name">cur</span>.<span class="name">height</span>
<span class="name">onFrontChanged</span>: <span class="name">resync</span>();
<span class="name">onBackChanged</span>: <span class="name">resync</span>();
<span class="keyword">function</span> <span class="name">resync</span>() {<span class="comment">//TODO: Are the items ever actually visible?</span>
<span class="name">back</span>.<span class="name">parent</span> <span class="operator">=</span> <span class="name">container</span>;
<span class="name">front</span>.<span class="name">parent</span> <span class="operator">=</span> <span class="name">container</span>;
<span class="name">frontShown</span> ? <span class="name">back</span>.<span class="name">visible</span> <span class="operator">=</span> <span class="number">false</span> : <span class="name">front</span>.<span class="name">visible</span> <span class="operator">=</span> <span class="number">false</span>;
}
property <span class="type">bool</span> <span class="name">frontShown</span>: <span class="number">true</span>
<span class="name">onFrontShownChanged</span>: {
<span class="name">back</span>.<span class="name">visible</span> <span class="operator">=</span> !<span class="name">frontShown</span>
<span class="name">front</span>.<span class="name">visible</span> <span class="operator">=</span> <span class="name">frontShown</span>
}
<span class="keyword">function</span> <span class="name">flipUp</span>(<span class="name">start</span>) {
<span class="name">effect</span>.<span class="name">visible</span> <span class="operator">=</span> <span class="number">true</span>;
<span class="name">effect</span>.<span class="name">sourceA</span> <span class="operator">=</span> <span class="name">effect</span>.<span class="name">source1</span>
<span class="name">effect</span>.<span class="name">sourceB</span> <span class="operator">=</span> <span class="name">effect</span>.<span class="name">source2</span>
<span class="keyword">if</span> (<span class="name">start</span> <span class="operator">==</span> <span class="name">undefined</span>)
<span class="name">start</span> <span class="operator">=</span> <span class="number">1.0</span>;
<span class="name">deltaAnim</span>.<span class="name">from</span> <span class="operator">=</span> <span class="name">start</span>;
<span class="name">deltaAnim</span>.<span class="name">to</span> <span class="operator">=</span> <span class="number">0.0</span>
<span class="name">dAnim</span>.<span class="name">start</span>();
<span class="name">frontShown</span> <span class="operator">=</span> <span class="number">false</span>;
}
<span class="keyword">function</span> <span class="name">flipDown</span>(<span class="name">start</span>) {
<span class="name">effect</span>.<span class="name">visible</span> <span class="operator">=</span> <span class="number">true</span>;
<span class="name">effect</span>.<span class="name">sourceA</span> <span class="operator">=</span> <span class="name">effect</span>.<span class="name">source1</span>
<span class="name">effect</span>.<span class="name">sourceB</span> <span class="operator">=</span> <span class="name">effect</span>.<span class="name">source2</span>
<span class="keyword">if</span> (<span class="name">start</span> <span class="operator">==</span> <span class="name">undefined</span>)
<span class="name">start</span> <span class="operator">=</span> <span class="number">0.0</span>;
<span class="name">deltaAnim</span>.<span class="name">from</span> <span class="operator">=</span> <span class="name">start</span>;
<span class="name">deltaAnim</span>.<span class="name">to</span> <span class="operator">=</span> <span class="number">1.0</span>
<span class="name">dAnim</span>.<span class="name">start</span>();
<span class="name">frontShown</span> <span class="operator">=</span> <span class="number">true</span>;
}
<span class="type"><a href="qml-qtquick-shadereffect.html">ShaderEffect</a></span> {
<span class="name">id</span>: <span class="name">effect</span>
<span class="name">width</span>: <span class="name">cur</span>.<span class="name">width</span>
<span class="name">height</span>: <span class="name">cur</span>.<span class="name">height</span>
property <span class="type">real</span> <span class="name">factor</span>: <span class="name">container</span>.<span class="name">factor</span> <span class="operator">*</span> <span class="name">width</span>
property <span class="type">real</span> <span class="name">delta</span>: <span class="number">1.0</span>
<span class="name">mesh</span>: <span class="name">GridMesh</span> { <span class="name">resolution</span>: <span class="name">Qt</span>.<span class="name">size</span>(<span class="number">8</span>,<span class="number">2</span>) }
SequentialAnimation on <span class="name">delta</span> {
<span class="name">id</span>: <span class="name">dAnim</span>
<span class="name">running</span>: <span class="number">false</span>
<span class="type"><a href="qml-qtquick-numberanimation.html">NumberAnimation</a></span> {
<span class="name">id</span>: <span class="name">deltaAnim</span>
<span class="name">duration</span>: <span class="name">animDuration</span><span class="comment">//expose anim</span>
}
}
property <span class="type">variant</span> <span class="name">sourceA</span>: <span class="name">source1</span>
property <span class="type">variant</span> <span class="name">sourceB</span>: <span class="name">source1</span>
property <span class="type">variant</span> <span class="name">source1</span>: <span class="name">ShaderEffectSource</span> {
<span class="name">sourceItem</span>: <span class="name">front</span>
<span class="name">hideSource</span>: <span class="name">effect</span>.<span class="name">visible</span>
}
property <span class="type">variant</span> <span class="name">source2</span>: <span class="name">ShaderEffectSource</span> {
<span class="name">sourceItem</span>: <span class="name">back</span>
<span class="name">hideSource</span>: <span class="name">effect</span>.<span class="name">visible</span>
}
<span class="name">fragmentShader</span>: <span class="string">"
uniform lowp float qt_Opacity;
uniform sampler2D sourceA;
uniform sampler2D sourceB;
uniform highp float delta;
varying highp vec2 qt_TexCoord0;
void main() {
highp vec4 tex = vec4(qt_TexCoord0.x, qt_TexCoord0.y * 2.0, qt_TexCoord0.x, (qt_TexCoord0.y-0.5) * 2.0);
highp float shade = clamp(delta*2.0, 0.5, 1.0);
highp vec4 col;
if (qt_TexCoord0.y < 0.5) {
col = texture2D(sourceA, tex.xy) * (shade);
} else {
col = texture2D(sourceB, tex.zw) * (1.5 - shade);
col.w = 1.0;
}
gl_FragColor = col * qt_Opacity;
}
"</span>
property <span class="type">real</span> <span class="name">h</span>: <span class="name">height</span>
<span class="name">vertexShader</span>: <span class="string">"
uniform highp float delta;
uniform highp float factor;
uniform highp float h;
uniform highp mat4 qt_Matrix;
attribute highp vec4 qt_Vertex;
attribute highp vec2 qt_MultiTexCoord0;
varying highp vec2 qt_TexCoord0;
void main() {
highp vec4 pos = qt_Vertex;
if (qt_MultiTexCoord0.y == 0.0)
pos.x += factor * (1. - delta) * (qt_MultiTexCoord0.x * -2.0 + 1.0);
else if (qt_MultiTexCoord0.y == 1.0)
pos.x += factor * (delta) * (qt_MultiTexCoord0.x * -2.0 + 1.0);
else
pos.y = delta * h;
gl_Position = qt_Matrix * pos;
qt_TexCoord0 = qt_MultiTexCoord0;
}"</span>
}
}
</pre>
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<!-- @@@demos/tweetsearch/content/FlipBar.qml -->
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Documentation contributions included herein are the copyrights of
their respective owners.<br> The documentation provided herein is licensed under the terms of the <a href="http://www.gnu.org/licenses/fdl.html">GNU Free Documentation License version 1.3</a> as published by the Free Software Foundation.<br> Qt and respective logos are trademarks of The Qt Company Ltd. in Finland and/or other countries worldwide. All other trademarks are property
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