plasma-framework/declarativeimports/plasmacomponents/qml/TabBarLayout.qml

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/****************************************************************************
**
** Copyright 2011 Marco Martin <mart@kde.org>
**
** 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."
** $QT_END_LICENSE$
**
****************************************************************************/
import QtQuick 1.1
Item {
id: root
Component.onCompleted: priv.layoutChildren()
onChildrenChanged: priv.layoutChildren()
onWidthChanged: priv.layoutChildren()
onHeightChanged: priv.layoutChildren()
Keys.onPressed: {
if (event.key == Qt.Key_Right || event.key == Qt.Key_Left) {
if (event.key == Qt.Key_Right || priv.mirrored) {
var oldIndex = priv.currentButtonIndex()
if (oldIndex != root.children.length - 1) {
priv.tabGroup.currentTab = root.children[oldIndex + 1].tab
event.accepted = true
}
} else if (event.key == Qt.Key_Left || priv.mirrored) {
var oldIndex = priv.currentButtonIndex()
if (oldIndex != 0) {
priv.tabGroup.currentTab = root.children[oldIndex - 1].tab
event.accepted = true
}
}
}
}
focus: true
QtObject {
id: priv
property Item firstButton: root.children.length > 0 ? root.children[0] : null
property Item firstTab: firstButton ? (firstButton.tab != null ? firstButton.tab : null) : null
property Item tabGroup: firstTab ? (firstTab.parent ? firstTab.parent.parent : null) : null
property bool mirrored: root.LayoutMirroring.enabled
onMirroredChanged: layoutChildren()
function currentButtonIndex() {
for (var i = 0; i < root.children.length; ++i) {
if (root.children[i].tab == tabGroup.currentTab)
return i
}
return -1
}
function layoutChildren() {
var childCount = root.children.length
var contentWidth = 0
var contentHeight = 0
if (childCount != 0) {
var itemWidth = root.width / childCount
var itemIndex = mirrored ? childCount - 1 : 0
var increment = mirrored ? - 1 : 1
for (var i = 0; i < childCount; ++i, itemIndex += increment) {
var child = root.children[itemIndex]
child.x = i * itemWidth
child.y = 0
child.width = itemWidth
child.height = root.height
if (child.implicitWidth != undefined) {
contentWidth = Math.max(contentWidth, (child.implicitWidth + buttonFrame.margins.left*2 + buttonFrame.margins.right*2) * childCount)
contentHeight = Math.max(contentHeight, (child.implicitHeight + buttonFrame.margins.top + buttonFrame.margins.bottom))
}
}
}
root.implicitWidth = contentWidth
root.implicitHeight = contentHeight
}
}
}