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/*
* Copyright (C) 2016 Michael Bohlender, <michael.bohlender@kdemail.net>
* Copyright (C) 2017 Christian Mollekopf, <mollekopf@kolabsystems.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
import QtQuick 2.7
import QtQuick.Controls 2
import QtQuick.Layouts 1.1
import org.kube.framework 1.0 as Kube
import QtQml 2.2 as QtQml
FocusScope {
id: root
property alias model: repeater.model
property alias delegate: repeater.delegate
property alias contentHeight: flickable.contentHeight
property int currentIndex: -1
//We want to avoid interfering with scrolling as soon as the user starts to scroll. This is important if i.e. an html mail loads slowly.
//However, we have to maintain position as the initial items expand, so we have to react to contentHeight changes. scrollToEnd ensures both.
property bool scrollToEnd: true
property var currentItem: null
function setCurrentItem() {
if (currentItem) {
currentItem.isCurrentItem = false
}
if (currentIndex >= 0 && activeFocus) {
var item = repeater.itemAt(currentIndex)
if (item) {
item.isCurrentItem = true
currentItem = item
}
} else {
currentItem = null
}
}
onCurrentIndexChanged: {
setCurrentItem()
}
onActiveFocusChanged: {
setCurrentItem()
}
Flickable {
id: flickable
anchors.fill: parent
//Optimize for view quality
pixelAligned: true
contentWidth: width
contentHeight: col.height
function scrollToIndex(index) {
var item = repeater.itemAt(index)
if (item) {
var pos = item.y
var scrollToEndPos = (flickable.contentHeight - flickable.height)
//Avoid scrolling past the end
if (pos < scrollToEndPos) {
flickable.contentY = pos
} else {
flickable.contentY = scrollToEndPos
}
}
}
onMovementStarted: {
root.scrollToEnd = false
}
onContentHeightChanged: {
if (repeater.count && root.scrollToEnd) {
//Scroll to the last item
root.currentIndex = repeater.count - 1
flickable.scrollToIndex(root.currentIndex)
}
}
Column {
id: col
width: parent.width
spacing: 2
Repeater {
id: repeater
onCountChanged: {
for (var i = 0; i < count; i++) {
itemAt(i).index = i
}
root.scrollToEnd = true
flickable.scrollToIndex(root.currentIndex)
}
}
}
function incrementCurrentIndex() {
if (currentIndex < repeater.count - 1) {
currentIndex = currentIndex + 1
}
}
function decrementCurrentIndex() {
if (currentIndex > 0) {
currentIndex = currentIndex - 1
}
}
Keys.onDownPressed: {
incrementCurrentIndex()
scrollToIndex(currentIndex)
}
Keys.onUpPressed: {
decrementCurrentIndex()
scrollToIndex(currentIndex)
}
Kube.ScrollHelper {
id: scrollHelper
flickable: flickable
anchors.fill: parent
}
//Intercept all scroll events,
//necessary due to the webengineview
Kube.MouseProxy {
anchors.fill: parent
target: scrollHelper
forwardWheelEvents: true
}
ScrollBar.vertical: Kube.ScrollBar {}
}
}
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