Qt Reference Documentation

StyleLoader.js Example File

examples/symbian/scalefm/core/StyleLoader.js
 /****************************************************************************
 **
 ** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
 ** All rights reserved.
 ** Contact: Nokia Corporation (qt-info@nokia.com)
 **
 ** This file is part of the Qt Components project.
 **
 ** $QT_BEGIN_LICENSE:BSD$
 ** 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 Nokia Corporation and its Subsidiary(-ies) 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."
 ** $QT_END_LICENSE$
 **
 ****************************************************************************/

 var sourcePath
 var prevPath = ""
 var object = null

 function roundNearestFive(value) {
     return Math.round(value / 5.0) * 5
 }

 function path(componentName, source) {
     var id = componentName.lastIndexOf("/")
     if (id < 0)
         id = componentName.lastIndexOf("\\")
     var src = ""
     if (id >= 0)
         src += componentName.substr(0, id + 1)
     src += source
     src += componentName.substr(id + 1)
     return src
 }

 function displayCategory() {
     switch (screen.displayCategory) {
         case Screen.Small: return "Small"
         case Screen.Normal: return "Normal"
         case Screen.Large: return "Large"
         case Screen.ExtraLarge:
         default:  return "ExtraLarge"
     }
 }

 function displayDensity() {
     switch (screen.density) {
         case Screen.Low: return "Low"
         case Screen.Medium: return "Medium"
         case Screen.High: return "High"
         case Screen.ExtraHigh:
         default:  return "ExtraHigh"
     }
 }

 function loadStyle(componentName, container, forceFallback) {
     var source = ""
     var fallback = source

     if (!forceFallback)
         source = Math.max(screen.width, screen.height) + "_" + Math.min(screen.width, screen.height) + "/" + roundNearestFive(screen.dpi) + "/"

     sourcePath = path(componentName, source)
     if (sourcePath != prevPath) {
         console.log("Loading: " + sourcePath)
         var component = Qt.createComponent(sourcePath)
         if (component.status != Component.Ready) {
             console.log("File not found, falling back to categories")
             var category = displayCategory() + "/" + displayDensity() + "/"
             sourcePath = path(componentName, category)
             if (sourcePath != prevPath) {
                 console.log("Loading: " + sourcePath)
                 component = Qt.createComponent(sourcePath)
                 if (component.status != Component.Ready) {
                     console.log("File not found, falling back to default")
                     sourcePath = path(componentName, fallback)
                     if (sourcePath != prevPath) {
                         console.log("Loading: " + sourcePath)
                         component = Qt.createComponent(sourcePath)
                         if (component.status != Component.Ready)
                             console.log("Default file not found!")
                     }
                 }
             }
         }
         if (component.status == Component.Ready) {
             object = component.createObject(container)
             prevPath = sourcePath
         }
     }
     return object
 }