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https://bitbucket.org/smil3y/kde-workspace.git
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91 lines
3 KiB
QML
91 lines
3 KiB
QML
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/**
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* Copyright (C) 2012 Marco Martin <mart@kde.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Library General Public License as
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* published by the Free Software Foundation; either version 2, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this program; if not, write to the
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* Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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import QtQuick 1.1
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/**
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* This item can load any qml component, just like a Loader. Important
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* difference, the component will only be loaded when the "when" property is
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* satisfied (ie evaluates to true) in this way it's easy to have big (and
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* memory expensive) parts of the user interface load only when a certain
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* condition is satisfied. For instance the contents of the tabs of a TabBar
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* can be loaded only when they become the current page.
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*/
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Item {
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id: root
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/**
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* type:bool
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* Condition that tells when to load the declarative component
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*/
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property alias when: loader.when
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/**
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* type:variant
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* It can be a string with a path name of a qml file or a Component. It's
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* the component that will be loaded when "when" is true. If the component
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* changes the old instantiated component will be deleted and the new one
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* will be loaded instead.
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*/
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property alias source: loader.conditionalSource
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/**
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* type:Item
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* The item instantiated from component, if any.
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*/
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property alias item: loader.item
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implicitWidth: loader.item ? loader.item.implicitWidth : 0
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implicitHeight: loader.item ? loader.item.implicitHeight : 0
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Loader {
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id: loader
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anchors.fill: parent
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property bool when: false
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property variant conditionalSource
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//internal
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property variant oldConditionalSource
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onWhenChanged: loadTimer.restart()
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onConditionalSourceChanged: loadTimer.restart()
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Timer {
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id: loadTimer
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interval: 0
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onTriggered: {
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if (loader.when &&
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(loader.item === null ||
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loader.conditionalSource !== loader.oldConditionalSource)) {
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if (typeof(loader.conditionalSource) === "string") {
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loader.source = loader.conditionalSource
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} else {
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loader.sourceComponent = loader.conditionalSource
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}
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loader.oldConditionalSource = loader.conditionalSource
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loader.item.visible = true
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loader.item.anchors.fill = loader.item.parent
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}
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}
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}
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}
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}
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