240 lines
7.9 KiB
JavaScript
240 lines
7.9 KiB
JavaScript
/****************************************************************************
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**
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** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
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** All rights reserved.
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** Contact: Nokia Corporation (qt-info@nokia.com)
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**
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** This file is part of the Qt Components project.
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**
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** $QT_BEGIN_LICENSE:BSD$
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** You may use this file under the terms of the BSD license as follows:
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**
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** "Redistribution and use in source and binary forms, with or without
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** modification, are permitted provided that the following conditions are
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** met:
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** * Redistributions of source code must retain the above copyright
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** notice, this list of conditions and the following disclaimer.
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** * Redistributions in binary form must reproduce the above copyright
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** notice, this list of conditions and the following disclaimer in
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** the documentation and/or other materials provided with the
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** distribution.
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** * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor
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** the names of its contributors may be used to endorse or promote
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** products derived from this software without specific prior written
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** permission.
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**
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** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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// Page stack. Items are page containers.
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var pageStack = [];
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// Page component cache map. Key is page url, value is page component.
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var componentCache = {};
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// Returns the page stack depth.
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function getDepth() {
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return pageStack.length;
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}
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// Pushes a page on the stack.
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function push(page, properties, replace, immediate) {
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// page order sanity check
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if ((!replace && page == currentPage)
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|| (replace && pageStack.length > 1
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&& page == pageStack[pageStack.length - 2].page)) {
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throw new Error("Cannot navigate so that the resulting page stack has two consecutive entries of the same page instance.");
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}
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// figure out if more than one page is being pushed
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var pages;
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if (page instanceof Array) {
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pages = page;
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page = pages.pop();
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if (page.createObject === undefined && page.parent === undefined && typeof page != "string") {
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properties = properties || page.properties;
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page = page.page;
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}
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}
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// get the current container
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var oldContainer = pageStack[pageStack.length - 1];
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// pop the old container off the stack if this is a replace
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if (oldContainer && replace) {
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pageStack.pop();
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}
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// push any extra defined pages onto the stack
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if (pages) {
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var i;
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for (i = 0; i < pages.length; i++) {
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var tPage = pages[i];
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var tProps;
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if (tPage.createObject === undefined && tPage.parent === undefined && typeof tPage != "string") {
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tProps = tPage.properties;
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tPage = tPage.page;
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}
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pageStack.push(initPage(tPage, tProps));
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}
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}
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// initialize the page
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var container = initPage(page, properties);
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// push the page container onto the stack
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pageStack.push(container);
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depth = pageStack.length;
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currentPage = container.page;
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// perform page transition
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immediate = immediate || !oldContainer;
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var orientationChange = false;
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if (oldContainer) {
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orientationChange = orientationChanges(oldContainer.page, container.page);
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oldContainer.pushExit(replace, immediate, orientationChange);
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}
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// sync tool bar
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var tools = container.page.tools || null;
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if (toolBar) {
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toolBar.setTools(tools, immediate ? "set" : replace ? "replace" : "push");
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}
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container.pushEnter(immediate, orientationChange);
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return container.page;
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}
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// Initializes a page and its container.
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function initPage(page, properties) {
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var container = containerComponent.createObject(root);
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var pageComp;
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if (page.createObject) {
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// page defined as component
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pageComp = page;
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} else if (typeof page == "string") {
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// page defined as string (a url)
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pageComp = componentCache[page];
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if (!pageComp) {
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pageComp = componentCache[page] = Qt.createComponent(page);
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}
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}
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if (pageComp) {
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if (pageComp.status == Component.Error) {
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throw new Error("Error while loading page: " + pageComp.errorString());
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} else {
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// instantiate page from component
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page = pageComp.createObject(container, properties || {});
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}
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} else {
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// copy properties to the page
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for (var prop in properties) {
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if (properties.hasOwnProperty(prop)) {
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page[prop] = properties[prop];
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}
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}
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}
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container.page = page;
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if (page.parent == null) {
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container.owner = container;
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} else {
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container.owner = page.parent;
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}
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// the page has to be reparented if
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if (page.parent != container) {
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page.parent = container;
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}
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if (page.pageStack !== undefined) {
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page.pageStack = root;
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}
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page.anchors.fill = container
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return container;
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}
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// Pops a page off the stack.
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function pop(page, immediate) {
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// make sure there are enough pages in the stack to pop
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if (pageStack.length > 1) {
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//unwind to itself means no pop
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if (page !== undefined && page == pageStack[pageStack.length - 1].page) {
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return
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}
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// pop the current container off the stack and get the next container
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var oldContainer = pageStack.pop();
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var container = pageStack[pageStack.length - 1];
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if (page !== undefined) {
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// an unwind target has been specified - pop until we find it
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while (page != container.page && pageStack.length > 1) {
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container.cleanup();
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pageStack.pop();
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container = pageStack[pageStack.length - 1];
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}
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}
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depth = pageStack.length;
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currentPage = container.page;
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// perform page transition
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var orientationChange = orientationChanges(oldContainer.page, container.page);
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oldContainer.popExit(immediate, orientationChange);
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container.popEnter(immediate, orientationChange);
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// sync tool bar
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var tools = container.page.tools || null;
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if (toolBar) {
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toolBar.setTools(tools, immediate ? "set" : "pop");
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}
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return oldContainer.page;
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} else {
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return null;
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}
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}
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// Checks if the orientation changes between oldPage and newPage
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function orientationChanges(oldPage, newPage) {
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return newPage.orientationLock != PageOrientation.Automatic
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&& newPage.orientationLock != PageOrientation.LockPrevious
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&& newPage.orientationLock != oldPage.orientationLock
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}
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// Clears the page stack.
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function clear() {
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var container;
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while (container = pageStack.pop()) {
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container.cleanup();
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}
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depth = 0;
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currentPage = null;
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}
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// Iterates through all pages in the stack (top to bottom) to find a page.
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function find(func) {
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for (var i = pageStack.length - 1; i >= 0; i--) {
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var page = pageStack[i].page;
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if (func(page)) {
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return page;
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}
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}
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return null;
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}
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