Unity 8
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 bool forceNonInteractive: false
27  property alias scopes: dashContentList.model
28  property alias currentIndex: dashContentList.currentIndex
29  property int workaroundRestoreIndex: -1
30  readonly property string currentScopeId: dashContentList.currentItem ? dashContentList.currentItem.scopeId : ""
31  readonly property var currentScope: dashContentList.currentItem ? dashContentList.currentItem.theScope : null
32  readonly property bool subPageShown: dashContentList.currentItem && dashContentList.currentItem.item ?
33  dashContentList.currentItem.item.subPageShown : false
34  readonly property bool processing: dashContentList.currentItem && dashContentList.currentItem.item
35  && dashContentList.currentItem.item.processing || false
36  readonly property bool pageHeaderTotallyVisible: dashContentList.currentItem && dashContentList.currentItem.item
37  && dashContentList.currentItem.item.pageHeaderTotallyVisible || false
38 
39  signal scopeLoaded(string scopeId)
40  signal gotoScope(string scopeId)
41  signal openScope(var scope)
42  signal closePreview()
43 
44  // If we set the current scope index before the scopes have been added,
45  // then we need to wait until the loaded signals gets emitted from the scopes
46  property var set_current_index: undefined
47  Connections {
48  target: scopes
49  onLoadedChanged: {
50  if (scopes.loaded && set_current_index != undefined) {
51  setCurrentScopeAtIndex(set_current_index[0], set_current_index[1], set_current_index[2]);
52  set_current_index = undefined;
53  }
54  }
55  onRowsMoved: {
56  // FIXME This is to workaround a Qt bug with the model moving the current item
57  // when the list is ListView.SnapOneItem and ListView.StrictlyEnforceRange
58  // together with the code in Dash.qml
59  if (row == dashContentList.currentIndex || start == dashContentList.currentIndex) {
60  dashContent.workaroundRestoreIndex = dashContentList.currentIndex;
61  dashContentList.currentIndex = -1;
62  }
63  }
64  }
65 
66  Connections {
67  target: UriHandler
68  onOpened: dashContentList.currentItem.theScope.performQuery(uris[0])
69  }
70 
71  function setCurrentScopeAtIndex(index, animate, reset) {
72  // if the scopes haven't loaded yet, then wait until they are.
73  if (!scopes.loaded) {
74  set_current_index = [ index, animate, reset ]
75  return;
76  }
77 
78  var storedMoveDuration = dashContentList.highlightMoveDuration
79  var storedMoveSpeed = dashContentList.highlightMoveVelocity
80  if (!animate) {
81  dashContentList.highlightMoveVelocity = units.gu(4167)
82  dashContentList.highlightMoveDuration = 0
83  }
84 
85  set_current_index = undefined;
86 
87  if (dashContentList.count > index) {
88  dashContentList.currentIndex = index
89 
90  if (reset) {
91  dashContentList.currentItem.item.positionAtBeginning()
92  }
93  }
94 
95  if (!animate) {
96  dashContentList.highlightMoveDuration = storedMoveDuration
97  dashContentList.highlightMoveVelocity = storedMoveSpeed
98  }
99  }
100 
101  Item {
102  id: dashContentListHolder
103 
104  anchors.fill: parent
105 
106  DashBackground {
107  anchors.fill: parent
108  }
109 
110  ListView {
111  id: dashContentList
112  objectName: "dashContentList"
113 
114  interactive: !dashContent.forceNonInteractive && dashContent.scopes.loaded && currentItem
115  && !currentItem.moving && !currentItem.navigationDisableParentInteractive && !currentItem.subPageShown
116  anchors.fill: parent
117  orientation: ListView.Horizontal
118  boundsBehavior: Flickable.DragAndOvershootBounds
119  flickDeceleration: units.gu(625)
120  maximumFlickVelocity: width * 5
121  snapMode: ListView.SnapOneItem
122  highlightMoveDuration: 250
123  highlightRangeMode: ListView.StrictlyEnforceRange
124  // TODO Investigate if we can switch to a smaller cache buffer when/if UbuntuShape gets more performant
125  // 1073741823 is s^30 -1. A quite big number so that you have "infinite" cache, but not so
126  // big so that if you add if with itself you're outside the 2^31 int range
127  cacheBuffer: 1073741823
128  onMovementStarted: currentItem.item.showHeader();
129  clip: parent.x != 0
130 
131  // TODO QTBUG-40846 and QTBUG-40848
132  // The remove transition doesn't happen when removing the last item
133  // And can't work around it because index is reset to -1 regardless of
134  // ListView.delayRemove
135 
136  remove: Transition {
137  SequentialAnimation {
138  PropertyAction { property: "layer.enabled"; value: true }
139  PropertyAction { property: "ListView.delayRemove"; value: true }
140  ParallelAnimation {
141  PropertyAnimation { properties: "scale"; to: 0.25; duration: UbuntuAnimation.SnapDuration }
142  PropertyAnimation { properties: "y"; to: dashContent.height; duration: UbuntuAnimation.SnapDuration }
143  }
144  PropertyAction { property: "ListView.delayRemove"; value: false }
145  }
146  }
147  removeDisplaced: Transition {
148  PropertyAnimation { property: "x"; duration: UbuntuAnimation.SnapDecision }
149  }
150 
151  // If the number of items is less than the current index, then need to reset to another item.
152  onCountChanged: {
153  if (count > 0) {
154  if (currentIndex >= count) {
155  dashContent.setCurrentScopeAtIndex(count-1, true, true)
156  } else if (currentIndex < 0) {
157  // setting currentIndex directly, cause we don't want to loose set_current_index
158  dashContentList.currentIndex = 0
159  }
160  }
161  }
162 
163  delegate:
164  Loader {
165  id: loader
166  width: ListView.view.width
167  height: ListView.view.height
168  opacity: { // hide delegate if offscreen
169  var xPositionRelativetoView = ListView.view.contentX - x
170  return (xPositionRelativetoView > -width && xPositionRelativetoView < width) ? 1 : 0
171  }
172  asynchronous: true
173  source: "GenericScopeView.qml"
174  objectName: "scopeLoader" + index
175 
176  readonly property bool moving: item ? item.moving : false
177  readonly property bool navigationDisableParentInteractive: item ? item.navigationDisableParentInteractive : false
178  readonly property bool subPageShown: item ? item.subPageShown : false
179  readonly property var categoryView: item ? item.categoryView : null
180  readonly property var theScope: scope
181 
182  // these are needed for autopilot tests
183  readonly property string scopeId: scope.id
184  readonly property bool isCurrent: ListView.isCurrentItem
185  readonly property bool isLoaded: status == Loader.Ready
186 
187  onLoaded: {
188  item.objectName = scope.id
189  item.scope = Qt.binding(function() { return scope })
190  item.isCurrent = Qt.binding(function() { return visible && ListView.isCurrentItem })
191  dashContent.scopeLoaded(item.scope.id)
192  item.paginationCount = Qt.binding(function() { return dashContentList.count } )
193  item.paginationIndex = Qt.binding(function() { return dashContentList.currentIndex } )
194  item.visibleToParent = Qt.binding(function() { return loader.opacity != 0 });
195  item.holdingList = dashContentList;
196  item.forceNonInteractive = Qt.binding(function() { return dashContent.forceNonInteractive } )
197  }
198  Connections {
199  target: isCurrent ? scope : null
200  onGotoScope: {
201  // Note here scopeId is the signal parameter and not the loader property
202  dashContent.gotoScope(scopeId);
203  }
204  onOpenScope: {
205  dashContent.openScope(scope);
206  }
207  }
208  Connections {
209  target: dashContent
210  onClosePreview: if (item) item.closePreview()
211  }
212 
213  Component.onDestruction: active = false
214  }
215  }
216  }
217 }