Unity 8
 All Classes Functions
DashContent.qml
1 /*
2  * Copyright (C) 2013, 2014 Canonical, Ltd.
3  *
4  * This program is free software; you can redistribute it and/or modify
5  * it under the terms of the GNU General Public License as published by
6  * the Free Software Foundation; version 3.
7  *
8  * This program is distributed in the hope that it will be useful,
9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11  * GNU General Public License for more details.
12  *
13  * You should have received a copy of the GNU General Public License
14  * along with this program. If not, see <http://www.gnu.org/licenses/>.
15  */
16 
17 import QtQuick 2.0
18 import Ubuntu.Components 0.1
19 import Unity 0.2
20 import Utils 0.1
21 import "../Components"
22 
23 Item {
24  id: dashContent
25 
26  property alias scopes: dashContentList.model
27  readonly property alias currentIndex: dashContentList.currentIndex
28  readonly property string currentScopeId: dashContentList.currentItem ? dashContentList.currentItem.scopeId : ""
29  readonly property var currentScope: dashContentList.currentItem ? dashContentList.currentItem.theScope : null
30  readonly property bool subPageShown: dashContentList.currentItem && dashContentList.currentItem.item ?
31  dashContentList.currentItem.item.subPageShown : false
32  readonly property bool processing: dashContentList.currentItem && dashContentList.currentItem.item
33  && dashContentList.currentItem.item.processing || false
34  readonly property bool pageHeaderTotallyVisible: dashContentList.currentItem && dashContentList.currentItem.item
35  && dashContentList.currentItem.item.pageHeaderTotallyVisible || false
36 
37  signal scopeLoaded(string scopeId)
38  signal gotoScope(string scopeId)
39  signal openScope(var scope)
40  signal closePreview()
41 
42  // If we set the current scope index before the scopes have been added,
43  // then we need to wait until the loaded signals gets emitted from the scopes
44  property var set_current_index: undefined
45  Connections {
46  target: scopes
47  onLoadedChanged: {
48  if (scopes.loaded && set_current_index != undefined) {
49  setCurrentScopeAtIndex(set_current_index[0], set_current_index[1], set_current_index[2]);
50  set_current_index = undefined;
51  }
52  }
53  }
54 
55  Connections {
56  target: UriHandler
57  onOpened: dashContentList.currentItem.theScope.performQuery(uris[0])
58  }
59 
60  function setCurrentScopeAtIndex(index, animate, reset) {
61  // if the scopes haven't loaded yet, then wait until they are.
62  if (!scopes.loaded) {
63  set_current_index = [ index, animate, reset ]
64  return;
65  }
66 
67  var storedMoveDuration = dashContentList.highlightMoveDuration
68  var storedMoveSpeed = dashContentList.highlightMoveVelocity
69  if (!animate) {
70  dashContentList.highlightMoveVelocity = units.gu(4167)
71  dashContentList.highlightMoveDuration = 0
72  }
73 
74  set_current_index = undefined;
75 
76  if (dashContentList.count > index)
77  {
78  dashContentList.currentIndex = index
79 
80  if (reset) {
81  dashContentList.currentItem.item.positionAtBeginning()
82  }
83  }
84 
85  if (!animate) {
86  dashContentList.highlightMoveDuration = storedMoveDuration
87  dashContentList.highlightMoveVelocity = storedMoveSpeed
88  }
89  }
90 
91  Item {
92  id: dashContentListHolder
93 
94  anchors.fill: parent
95 
96  DashBackground {
97  anchors.fill: parent
98  }
99 
100  ListView {
101  id: dashContentList
102  objectName: "dashContentList"
103 
104  interactive: dashContent.scopes.loaded && currentItem && !currentItem.moving && !currentItem.navigationShown && !currentItem.subPageShown
105  anchors.fill: parent
106  orientation: ListView.Horizontal
107  boundsBehavior: Flickable.DragAndOvershootBounds
108  flickDeceleration: units.gu(625)
109  maximumFlickVelocity: width * 5
110  snapMode: ListView.SnapOneItem
111  highlightMoveDuration: 250
112  highlightRangeMode: ListView.StrictlyEnforceRange
113  // TODO Investigate if we can switch to a smaller cache buffer when/if UbuntuShape gets more performant
114  cacheBuffer: 1073741823
115  onMovementStarted: currentItem.item.showHeader();
116  clip: parent.x != 0
117 
118  // TODO QTBUG-40846 and QTBUG-40848
119  // The remove transition doesn't happen when removing the last item
120  // And can't work around it because index is reset to -1 regardless of
121  // ListView.delayRemove
122 
123  remove: Transition {
124  SequentialAnimation {
125  PropertyAction { property: "layer.enabled"; value: true }
126  PropertyAction { property: "ListView.delayRemove"; value: true }
127  ParallelAnimation {
128  PropertyAnimation { properties: "scale"; to: 0.25; duration: UbuntuAnimation.SnapDuration }
129  PropertyAnimation { properties: "y"; to: dashContent.height; duration: UbuntuAnimation.SnapDuration }
130  }
131  PropertyAction { property: "ListView.delayRemove"; value: false }
132  }
133  }
134  removeDisplaced: Transition {
135  PropertyAnimation { property: "x"; duration: UbuntuAnimation.SnapDecision }
136  }
137 
138  // If the number of items is less than the current index, then need to reset to another item.
139  onCountChanged: {
140  if (count > 0) {
141  if (currentIndex >= count) {
142  dashContent.setCurrentScopeAtIndex(count-1, true, true)
143  } else if (currentIndex < 0) {
144  // setting currentIndex directly, cause we don't want to loose set_current_index
145  dashContentList.currentIndex = 0
146  }
147  }
148  }
149 
150  delegate:
151  Loader {
152  width: ListView.view.width
153  height: ListView.view.height
154  opacity: { // hide delegate if offscreen
155  var xPositionRelativetoView = ListView.view.contentX - x
156  return (xPositionRelativetoView > -width && xPositionRelativetoView < width) ? 1 : 0
157  }
158  asynchronous: true
159  source: "GenericScopeView.qml"
160  objectName: scope.id + " loader"
161 
162  readonly property bool moving: item ? item.moving : false
163  readonly property bool navigationShown: item ? item.navigationShown : false
164  readonly property bool subPageShown: item ? item.subPageShown : false
165  readonly property var categoryView: item ? item.categoryView : null
166  readonly property var theScope: scope
167 
168  // these are needed for autopilot tests
169  readonly property string scopeId: scope.id
170  readonly property bool isCurrent: ListView.isCurrentItem
171  readonly property bool isLoaded: status == Loader.Ready
172 
173  onLoaded: {
174  item.objectName = scope.id
175  item.scope = Qt.binding(function() { return scope })
176  item.isCurrent = Qt.binding(function() { return visible && ListView.isCurrentItem })
177  dashContent.scopeLoaded(item.scope.id)
178  item.paginationCount = Qt.binding(function() { return dashContentList.count } )
179  item.paginationIndex = Qt.binding(function() { return dashContentList.currentIndex } )
180  }
181  Connections {
182  target: isCurrent ? scope : null
183  onGotoScope: {
184  // Note here scopeId is the signal parameter and not the loader property
185  dashContent.gotoScope(scopeId);
186  }
187  onOpenScope: {
188  dashContent.openScope(scope);
189  }
190  }
191  Connections {
192  target: dashContent
193  onClosePreview: if (item) item.closePreview()
194  }
195 
196  Component.onDestruction: active = false
197  }
198  }
199  }
200 }