Ubuntu UI Toolkit

Merge lp:~tpeeters/ubuntu-ui-toolkit/cppHeader into lp:ubuntu-ui-toolkit/staging

  1. cppHeader
  2. Merge into staging
Proposed by Tim Peeters
Status: Merged
Approved by: Tim Peeters
Approved revision: 1681
Merged at revision: 1648
Proposed branch: lp:~tpeeters/ubuntu-ui-toolkit/cppHeader
Merge into: lp:ubuntu-ui-toolkit/staging
Diff against target: 908 lines (+775/-7)
10 files modified
components.api (+4/-0)
src/Ubuntu/Components/ListItems/1.2/ListItemHeader.qml (+1/-0)
src/Ubuntu/Components/ListItems/1.3/ListItemHeader.qml (+1/-0)
src/Ubuntu/Components/ListItems/ListItems.pro (+2/-2)
src/Ubuntu/Components/ListItems/qmldir (+3/-3)
src/Ubuntu/Components/plugin/plugin.cpp (+2/-0)
src/Ubuntu/Components/plugin/plugin.pri (+4/-2)
src/Ubuntu/Components/plugin/ucheader.cpp (+328/-0)
src/Ubuntu/Components/plugin/ucheader.h (+76/-0)
tests/unit_x11/tst_components/tst_header.qml (+354/-0)
To merge this branch: bzr merge lp:~tpeeters/ubuntu-ui-toolkit/cppHeader
Reviewer Review Type Date Requested Status
PS Jenkins bot continuous-integration Approve
Zsombor Egri Approve
Review via email: mp+271347@code.launchpad.net

Commit message

New Header C++ component.

Description of the change

New Header C++ component.

This will be used as the application header in following MRs.

Note that I had to disable the docs of the ListItems.Header by renaming ListItems/1.x/Header.qml to ListItemsHeader.qml and marking the component as deprecated. If I do not do this, The list item header 'hijacks" the properties of Ubuntu.Components.Header defined with \qmlproperty Header::flickable (for example).

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PS Jenkins bot (ps-jenkins) wrote :

FAILED: Continuous integration, rev:1652
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FAILED: Continuous integration, rev:1653
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FAILED: Continuous integration, rev:1654
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    FAILURE: http://jenkins.qa.ubuntu.com/job/ubuntu-sdk-team-ubuntu-ui-toolkit-staging-vivid-amd64-ci/966/console
    FAILURE: http://jenkins.qa.ubuntu.com/job/ubuntu-sdk-team-ubuntu-ui-toolkit-staging-vivid-armhf-ci/968/console
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PASSED: Continuous integration, rev:1655
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FAILED: Continuous integration, rev:1656
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    FAILURE: http://jenkins.qa.ubuntu.com/job/ubuntu-sdk-team-ubuntu-ui-toolkit-staging-vivid-armhf-ci/972/console
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FAILED: Continuous integration, rev:1658
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    FAILURE: http://jenkins.qa.ubuntu.com/job/ubuntu-sdk-team-ubuntu-ui-toolkit-staging-vivid-amd64-ci/972/console
    FAILURE: http://jenkins.qa.ubuntu.com/job/ubuntu-sdk-team-ubuntu-ui-toolkit-staging-vivid-armhf-ci/974/console
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PASSED: Continuous integration, rev:1663
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Zsombor Egri (zsombi) wrote :

Nice tests! I see you included some bug guards as well.

I have commented inline, reply on each if you want to keep the inline commenting active. I'll see them inline.

review: Needs Fixing
Revision history for this message
Tim Peeters (tpeeters) wrote :

All the proposed changes done (see inline comments), except the flickable.topMargin PropertyChange and the CPO. I'll push an update later with those two.

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PASSED: Continuous integration, rev:1673
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Zsombor Egri (zsombi) wrote :

Do you expect to be able to override the Header properties? if not (especially exposed and flickable, but I think all) then please make them FINAL!!!!

Also, see 2 comments inline. ListItem.header tests woudl be welcome!!!

review: Needs Fixing
Revision history for this message
Tim Peeters (tpeeters) wrote :

> Do you expect to be able to override the Header properties? if not (especially
> exposed and flickable, but I think all) then please make them FINAL!!!!
>
> Also, see 2 comments inline. ListItem.header tests woudl be welcome!!!

I made the properties FINAL in r1676.

About the ListItem.header I am not sure what to test. You can have code like this:
Item {
  Header {
    flickable: listView
  }
  ListView {
    id: listView
    anchors.fill: parent
    model: 50
  }
}

here the Header works exactly like with a Flickable, so no additional tests are needed.

Alternatively you can have code like this:

ListView {
    model: 50
    headerPositioning: ListView.PullBackHeader
    header: Component {
        Header { }
    }
}

here, (since you don't set the flickable of the header), the Header does not manipulate its y-value so it is positioned like any Item. What would I have to test there?

The two cases give similar results, but there is a difference when scrolling, and then releasing while the header is partially exposed: in the first case it will either show or hide completely (depending on how much it was exposed), it the second case it will just stay where it is.

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Zsombor Egri (zsombi) wrote :

Looks good now! Looking forward to see the code removals when we put these in Page :)

review: Approve
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FAILED: Continuous integration, rev:1679
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review: Needs Fixing (continuous-integration)
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FAILED: Autolanding.
More details in the following jenkins job:
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        deb: http://jenkins.qa.ubuntu.com/job/ubuntu-sdk-team-ubuntu-ui-toolkit-staging-vivid-armhf-autolanding/400/artifact/work/output/*zip*/output.zip
    UNSTABLE: http://jenkins.qa.ubuntu.com/job/ubuntu-sdk-team-ubuntu-ui-toolkit-staging-vivid-i386-autolanding/400

review: Needs Fixing (continuous-integration)
lp:~tpeeters/ubuntu-ui-toolkit/cppHeader updated
1681. By Tim Peeters

fix init

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Zsombor Egri (zsombi) wrote :

Still good :)

review: Approve
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PASSED: Continuous integration, rev:1681
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review: Approve (continuous-integration)
Revision history for this message
Tim Peeters (tpeeters) wrote :

CI approved it and jenkins?? set it back to "needs review"? Weird. I re-happroved it.

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1=== modified file 'components.api'
2--- components.api 2015-09-14 11:32:40 +0000
3+++ components.api 2015-09-23 11:35:46 +0000
4@@ -389,6 +389,10 @@
5 property bool useDeprecatedToolbar
6 Ubuntu.Components.ListItems.Header 1.3: Item
7 property string text
8+Ubuntu.Components.Header 1.3: StyledItem
9+ property bool exposed
10+ property Flickable flickable
11+ readonly property bool moving
12 Ubuntu.Components.Icon 1.0 0.1: Item
13 property color color
14 property color keyColor
15
16=== renamed file 'src/Ubuntu/Components/ListItems/1.2/Header.qml' => 'src/Ubuntu/Components/ListItems/1.2/ListItemHeader.qml'
17--- src/Ubuntu/Components/ListItems/1.2/Header.qml 2015-04-30 08:32:44 +0000
18+++ src/Ubuntu/Components/ListItems/1.2/ListItemHeader.qml 2015-09-23 11:35:46 +0000
19@@ -18,6 +18,7 @@
20
21 /*!
22 \qmltype Header
23+ \deprecated
24 \inqmlmodule Ubuntu.Components.ListItems 1.0
25 \ingroup ubuntu-listitems
26 \brief Header for grouping list items together
27
28=== renamed file 'src/Ubuntu/Components/ListItems/1.3/Header.qml' => 'src/Ubuntu/Components/ListItems/1.3/ListItemHeader.qml'
29--- src/Ubuntu/Components/ListItems/1.3/Header.qml 2015-04-29 07:21:29 +0000
30+++ src/Ubuntu/Components/ListItems/1.3/ListItemHeader.qml 2015-09-23 11:35:46 +0000
31@@ -18,6 +18,7 @@
32
33 /*!
34 \qmltype Header
35+ \deprecated
36 \inqmlmodule Ubuntu.Components.ListItems 1.0
37 \ingroup ubuntu-listitems
38 \brief Header for grouping list items together
39
40=== modified file 'src/Ubuntu/Components/ListItems/ListItems.pro'
41--- src/Ubuntu/Components/ListItems/ListItems.pro 2015-05-19 09:23:01 +0000
42+++ src/Ubuntu/Components/ListItems/ListItems.pro 2015-09-23 11:35:46 +0000
43@@ -6,7 +6,7 @@
44 1.2/Empty.qml \
45 1.2/Expandable.qml \
46 1.2/ExpandablesColumn.qml \
47- 1.2/Header.qml \
48+ 1.2/ListItemHeader.qml \
49 1.2/IconVisual.qml \
50 1.2/ImageWithFallback.qml \
51 1.2/ItemSelector.qml \
52@@ -25,7 +25,7 @@
53 1.3/Empty.qml \
54 1.3/Expandable.qml \
55 1.3/ExpandablesColumn.qml \
56- 1.3/Header.qml \
57+ 1.3/ListItemHeader.qml \
58 1.3/IconVisual.qml \
59 1.3/ImageWithFallback.qml \
60 1.3/ItemSelector.qml \
61
62=== modified file 'src/Ubuntu/Components/ListItems/qmldir'
63--- src/Ubuntu/Components/ListItems/qmldir 2015-05-02 13:27:39 +0000
64+++ src/Ubuntu/Components/ListItems/qmldir 2015-09-23 11:35:46 +0000
65@@ -3,7 +3,7 @@
66 Base 0.1 1.2/Base.qml
67 Caption 0.1 1.2/Caption.qml
68 Divider 0.1 1.2/Divider.qml
69-Header 0.1 1.2/Header.qml
70+Header 0.1 1.2/ListItemHeader.qml
71 internal IconVisual IconVisual.qml
72 internal LabelVisual LabelVisual.qml
73 MultiValue 0.1 1.2/MultiValue.qml
74@@ -23,7 +23,7 @@
75 Base 1.0 1.2/Base.qml
76 Caption 1.0 1.2/Caption.qml
77 Divider 1.0 1.2/Divider.qml
78-Header 1.0 1.2/Header.qml
79+Header 1.0 1.2/ListItemHeader.qml
80 MultiValue 1.0 1.2/MultiValue.qml
81 ItemSelector 1.0 1.2/ItemSelector.qml
82 ValueSelector 1.0 1.2/ValueSelector.qml
83@@ -41,7 +41,7 @@
84 Base 1.3 1.3/Base.qml
85 Caption 1.3 1.3/Caption.qml
86 Divider 1.3 1.3/Divider.qml
87-Header 1.3 1.3/Header.qml
88+Header 1.3 1.3/ListItemHeader.qml
89 MultiValue 1.3 1.3/MultiValue.qml
90 ItemSelector 1.3 1.3/ItemSelector.qml
91 ValueSelector 1.3 1.3/ValueSelector.qml
92
93=== modified file 'src/Ubuntu/Components/plugin/plugin.cpp'
94--- src/Ubuntu/Components/plugin/plugin.cpp 2015-09-21 11:40:22 +0000
95+++ src/Ubuntu/Components/plugin/plugin.cpp 2015-09-23 11:35:46 +0000
96@@ -66,6 +66,7 @@
97 #include "ucactionitem.h"
98 #include "uchaptics.h"
99 #include "ucabstractbutton.h"
100+#include "ucheader.h"
101
102 #include <sys/types.h>
103 #include <unistd.h>
104@@ -240,6 +241,7 @@
105 qmlRegisterType<UCProportionalShape>(uri, 1, 3, "ProportionalShape");
106 qmlRegisterType<LiveTimer>(uri, 1, 3, "LiveTimer");
107 qmlRegisterType<UCAbstractButton>(uri, 1, 3, "AbstractButton");
108+ qmlRegisterType<UCHeader>(uri, 1, 3, "Header");
109 }
110
111 void UbuntuComponentsPlugin::initializeEngine(QQmlEngine *engine, const char *uri)
112
113=== modified file 'src/Ubuntu/Components/plugin/plugin.pri'
114--- src/Ubuntu/Components/plugin/plugin.pri 2015-09-21 11:40:22 +0000
115+++ src/Ubuntu/Components/plugin/plugin.pri 2015-09-23 11:35:46 +0000
116@@ -84,7 +84,8 @@
117 $$PWD/ucactionitem.h \
118 $$PWD/uchaptics.h \
119 $$PWD/ucabstractbutton.h \
120- $$PWD/ucthemingextension.h
121+ $$PWD/ucthemingextension.h \
122+ $$PWD/ucheader.h
123
124 SOURCES += $$PWD/plugin.cpp \
125 $$PWD/uctheme.cpp \
126@@ -141,7 +142,8 @@
127 $$PWD/ucactionitem.cpp \
128 $$PWD/uchaptics.cpp \
129 $$PWD/ucabstractbutton.cpp \
130- $$PWD/ucthemingextension.cpp
131+ $$PWD/ucthemingextension.cpp \
132+ $$PWD/ucheader.cpp
133
134 # adapters
135 SOURCES += $$PWD/adapters/alarmsadapter_organizer.cpp
136
137=== added file 'src/Ubuntu/Components/plugin/ucheader.cpp'
138--- src/Ubuntu/Components/plugin/ucheader.cpp 1970-01-01 00:00:00 +0000
139+++ src/Ubuntu/Components/plugin/ucheader.cpp 2015-09-23 11:35:46 +0000
140@@ -0,0 +1,328 @@
141+/*
142+ * Copyright 2015 Canonical Ltd.
143+ *
144+ * This program is free software; you can redistribute it and/or modify
145+ * it under the terms of the GNU Lesser General Public License as published by
146+ * the Free Software Foundation; version 3.
147+ *
148+ * This program is distributed in the hope that it will be useful,
149+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
150+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
151+ * GNU Lesser General Public License for more details.
152+ *
153+ * You should have received a copy of the GNU Lesser General Public License
154+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
155+ */
156+
157+#include "ucheader.h"
158+#include <QDebug>
159+#include <QtQuick/private/qquickflickable_p.h>
160+#include <QtQuick/private/qquickanchors_p.h>
161+#include <QtQuick/private/qquickanimation_p.h>
162+#include "ucubuntuanimation.h"
163+#include "ucunits.h"
164+#include "propertychange_p.h"
165+
166+
167+/*!
168+ \qmltype Header
169+ \instantiates UCHeader
170+ \inherits StyledItem
171+ \inqmlmodule Ubuntu.Components 1.3
172+ \ingroup ubuntu
173+ \since Ubuntu.Components 1.3
174+ \brief Header bar that can contain the title and controls for the current view.
175+
176+ The Header can be exposed and hidden by setting the
177+ \l exposed property, and when a \l flickable is set, the header will
178+ scroll together with the flickable and expose or hide when the
179+ Flickable movement ends.
180+
181+ \qml
182+ import QtQuick 2.4
183+ import Ubuntu.Components 1.3
184+
185+ Item {
186+ width: units.gu(50)
187+ height: units.gu(70)
188+
189+ Header {
190+ id: header
191+ width: parent.width
192+ height: units.gu(6)
193+ z: 1 // ensure the header goes on top of the flickable contents
194+ flickable: scrollableContent
195+
196+ Rectangle {
197+ // to visualize the header
198+ anchors.fill: parent
199+ color: UbuntuColors.blue
200+ }
201+ }
202+
203+ Flickable {
204+ id: scrollableContent
205+ anchors.fill: parent
206+ contentHeight: height * 2
207+ Label {
208+ text: "Flick me"
209+ }
210+ }
211+ }
212+ \endqml
213+
214+ The default z-value is 0, so declare the Header after any Items that it should
215+ overlay, or set its z-value to be larger than that of the other Items.
216+ The initial y-value is 0, but scrolling the flickable or setting \l exposed to
217+ false will change the y-value in the range from -height to 0.
218+*/
219+
220+UCUbuntuAnimation *UCHeader::s_ubuntuAnimation = new UCUbuntuAnimation();
221+
222+UCHeader::UCHeader(QQuickItem *parent)
223+ : UCStyledItemBase(parent)
224+ , m_flickable(Q_NULLPTR)
225+ , m_showHideAnimation(new QQuickNumberAnimation)
226+ , m_flickableTopMarginBackup(Q_NULLPTR)
227+ , m_previous_contentY(0)
228+ , m_exposed(true)
229+ , m_moving(false)
230+{
231+ m_showHideAnimation->setParent(this);
232+ m_showHideAnimation->setTargetObject(this);
233+ m_showHideAnimation->setProperty("y");
234+ m_showHideAnimation->setEasing(s_ubuntuAnimation->StandardEasing());
235+ m_showHideAnimation->setDuration(s_ubuntuAnimation->BriskDuration());
236+
237+ connect(m_showHideAnimation, SIGNAL(runningChanged(bool)),
238+ this, SLOT(_q_showHideAnimationRunningChanged()));
239+ connect(this, SIGNAL(heightChanged()), this, SLOT(_q_heightChanged()));
240+}
241+
242+UCHeader::~UCHeader() {
243+ if (m_flickable != Q_NULLPTR) {
244+ Q_ASSERT(m_flickableTopMarginBackup != Q_NULLPTR);
245+ delete m_flickableTopMarginBackup;
246+ }
247+}
248+
249+void UCHeader::_q_heightChanged() {
250+ updateFlickableMargins();
251+ if (m_exposed || (!m_flickable.isNull() && m_flickable->contentY() <= 0.0)) {
252+ // Header was exposed before, or the flickable is scrolled up close to
253+ // the top so that the header should be visible.
254+ show();
255+ } else {
256+ hide();
257+ }
258+}
259+
260+/*!
261+ * \qmlproperty Flickable Header::flickable
262+ *
263+ * When flickable is set, scrolling vertically in the flickable, or setting the
264+ * Flickable's y-value will move the header y-position by the same amount as the
265+ * flickable content movement. When scrolling the flickable, upon release, the header
266+ * will animate to fully exposed or fully hidden state, depending on whether it was
267+ * more or less than half exposed when the user stopped moving the flickable.
268+ *
269+ * When flickable is null, the header can be exposed or
270+ * hidden by setting the \l exposed property.
271+ *
272+ * The topMargin of the flickable will automatically be updated to always match
273+ * the height of the header. When changing the flickable, the topMargin of the previous
274+ * flickable is set to 0.
275+ *
276+ * It is permitted to use a ListView as the value of flickable, but this works
277+ * well only if the ListView.header property is not set. Alternatively,
278+ * a Header component may be used for ListView.header, but in that case the flickable
279+ * of the Header must be null.
280+ */
281+QQuickFlickable* UCHeader::flickable() {
282+ return m_flickable.data();
283+}
284+
285+void UCHeader::setFlickable(QQuickFlickable *flickable) {
286+ if (m_flickable == flickable) {
287+ return;
288+ }
289+ if (!m_flickable.isNull()) {
290+ Q_ASSERT(m_flickableTopMarginBackup != Q_NULLPTR);
291+
292+ // Finish the current header movement in case the current
293+ // flickable is disconnected while scrolling.
294+ _q_flickableMovementEnded();
295+ m_flickable->disconnect(this);
296+
297+ delete m_flickableTopMarginBackup; // Restores previous value/binding for topMargin.
298+ m_flickableTopMarginBackup = Q_NULLPTR;
299+ }
300+
301+ m_flickable = flickable;
302+ Q_EMIT flickableChanged();
303+
304+ Q_ASSERT(m_flickableTopMarginBackup == Q_NULLPTR);
305+ if (!m_flickable.isNull()) {
306+ m_flickableTopMarginBackup = new PropertyChange(m_flickable, "topMargin");
307+ connect(m_flickable, SIGNAL(contentYChanged()),
308+ this, SLOT(_q_scrolledContents()));
309+ connect(m_flickable, SIGNAL(movementEnded()),
310+ this, SLOT(_q_flickableMovementEnded()));
311+ connect(m_flickable, SIGNAL(contentHeightChanged()),
312+ this, SLOT(_q_contentHeightChanged()));
313+ connect(m_flickable, SIGNAL(interactiveChanged()),
314+ this, SLOT(_q_flickableInteractiveChanged()));
315+ m_previous_contentY = m_flickable->contentY();
316+ updateFlickableMargins();
317+ show();
318+ }
319+}
320+
321+void UCHeader::updateFlickableMargins() {
322+ if (m_flickable.isNull()) {
323+ return;
324+ }
325+ qreal headerHeight = height();
326+ qreal previousHeaderHeight = m_flickable->topMargin();
327+ if (headerHeight != previousHeaderHeight) {
328+ qreal previousContentY = m_flickable->contentY();
329+ PropertyChange::setValue(m_flickableTopMarginBackup, headerHeight);
330+ // Push down contents when header grows,
331+ // pull up contents when header shrinks.
332+ m_flickable->setContentY(previousContentY - headerHeight + previousHeaderHeight);
333+ }
334+}
335+
336+void UCHeader::show() {
337+ if (!m_exposed) {
338+ m_exposed = true;
339+ Q_EMIT exposedChanged();
340+ if (m_showHideAnimation->isRunning()) {
341+ // The header was in the process of hiding.
342+ m_showHideAnimation->stop();
343+ }
344+ }
345+ if (isComponentComplete()) {
346+ m_showHideAnimation->setFrom(y());
347+ m_showHideAnimation->setTo(0.0);
348+ m_showHideAnimation->start();
349+ } else {
350+ this->setY(0.0);
351+ if (m_moving) {
352+ m_moving = false;
353+ Q_EMIT movingChanged();
354+ }
355+ }
356+}
357+
358+void UCHeader::hide() {
359+ if (m_exposed) {
360+ m_exposed = false;
361+ Q_EMIT exposedChanged();
362+ if (m_showHideAnimation->isRunning()) {
363+ // The header was in the process of showing.
364+ m_showHideAnimation->stop();
365+ }
366+ }
367+ if (isComponentComplete()) {
368+ m_showHideAnimation->setFrom(y());
369+ m_showHideAnimation->setTo(-1.0*height());
370+ m_showHideAnimation->start();
371+ } else {
372+ this->setY(-1.0*height());
373+ if (m_moving) {
374+ m_moving = false;
375+ Q_EMIT movingChanged();
376+ }
377+ }
378+}
379+
380+void UCHeader::_q_showHideAnimationRunningChanged() {
381+ if (!m_showHideAnimation->isRunning()) {
382+ // Animation finished.
383+ Q_ASSERT(m_moving);
384+ m_moving = false;
385+ Q_EMIT movingChanged();
386+ } else if (!m_moving) {
387+ // Animation started.
388+ m_moving = true;
389+ Q_EMIT movingChanged();
390+ } // else: Transition from flickable movement to showHideAnimation running.
391+}
392+
393+/*!
394+ * \qmlproperty bool Header::exposed
395+ * Exposes and hides the header by animating its y-value between -height and 0
396+ * to move it in or out of its parent Item. The value of exposed can be set directly,
397+ * or it will be automatically updated when the user exposes or hides the Header
398+ * by scrolling the Header's \l flickable.
399+ */
400+void UCHeader::setExposed(bool exposed) {
401+ if (exposed) {
402+ show();
403+ } else {
404+ hide();
405+ }
406+}
407+
408+/*!
409+ * \qmlproperty bool Header::moving
410+ * \readonly
411+ * Indicates whether the header is currently moving, either because contentY of
412+ * the \l flickable changes (due to user interaction or by setting it directly),
413+ * or because the header is animating in or out because the value of \l exposed
414+ * was updated.
415+ */
416+bool UCHeader::moving() {
417+ return m_moving;
418+}
419+
420+// Called when moving due to user interaction with the flickable, or by
421+// setting m_flickable.contentY programatically.
422+void UCHeader::_q_scrolledContents() {
423+ Q_ASSERT(!m_flickable.isNull());
424+ // Avoid moving the header when rebounding or being dragged over the bounds.
425+ if (!m_flickable->isAtYBeginning() && !m_flickable->isAtYEnd()) {
426+ qreal dy = m_flickable->contentY() - m_previous_contentY;
427+ // Restrict the header y between -height and 0.
428+ qreal clampedY = qMin(qMax(-height(), y() - dy), 0.0);
429+ setY(clampedY);
430+ }
431+ m_previous_contentY = m_flickable->contentY();
432+ if (!m_moving) {
433+ m_moving = true;
434+ Q_EMIT movingChanged();
435+ }
436+ if (!m_flickable->isMoving()) {
437+ // m_flickable.contentY was set directly, so no user flicking.
438+ _q_flickableMovementEnded();
439+ }
440+}
441+
442+void UCHeader::_q_flickableMovementEnded() {
443+ Q_ASSERT(!m_flickable.isNull());
444+ if ((m_flickable->contentY() < 0)
445+ || (y() > -height()/2.0)) {
446+ show();
447+ } else {
448+ hide();
449+ }
450+}
451+
452+void UCHeader::_q_contentHeightChanged() {
453+ Q_ASSERT(!m_flickable.isNull());
454+ if (m_flickable->height() >= m_flickable->contentHeight()) {
455+ // The user cannot scroll down to expose the header, so ensure
456+ // that it is visible.
457+ show();
458+ }
459+}
460+
461+void UCHeader::_q_flickableInteractiveChanged() {
462+ Q_ASSERT(!m_flickable.isNull());
463+ if (!m_flickable->isInteractive()) {
464+ // The user cannot scroll down to expose the header, so ensure
465+ // that it is visible.
466+ show();
467+ }
468+}
469
470=== added file 'src/Ubuntu/Components/plugin/ucheader.h'
471--- src/Ubuntu/Components/plugin/ucheader.h 1970-01-01 00:00:00 +0000
472+++ src/Ubuntu/Components/plugin/ucheader.h 2015-09-23 11:35:46 +0000
473@@ -0,0 +1,76 @@
474+/*
475+ * Copyright 2015 Canonical Ltd.
476+ *
477+ * This program is free software; you can redistribute it and/or modify
478+ * it under the terms of the GNU Lesser General Public License as published by
479+ * the Free Software Foundation; version 3.
480+ *
481+ * This program is distributed in the hope that it will be useful,
482+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
483+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
484+ * GNU Lesser General Public License for more details.
485+ *
486+ * You should have received a copy of the GNU Lesser General Public License
487+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
488+ */
489+
490+#ifndef UCHEADER_H
491+#define UCHEADER_H
492+
493+#include "ucstyleditembase.h"
494+#include <QtCore/QPointer>
495+
496+class QQuickFlickable;
497+class QQuickNumberAnimation;
498+class UCUbuntuAnimation;
499+class PropertyChange;
500+
501+class UCHeader : public UCStyledItemBase
502+{
503+ Q_OBJECT
504+ Q_PROPERTY(QQuickFlickable* flickable READ flickable WRITE setFlickable NOTIFY flickableChanged FINAL)
505+ Q_PROPERTY(bool exposed MEMBER m_exposed WRITE setExposed NOTIFY exposedChanged FINAL)
506+ Q_PROPERTY(bool moving READ moving NOTIFY movingChanged FINAL)
507+
508+public:
509+ explicit UCHeader(QQuickItem *parent = 0);
510+ ~UCHeader();
511+
512+ QQuickFlickable* flickable();
513+ void setFlickable(QQuickFlickable* flickable);
514+ void setExposed(bool exposed);
515+ bool moving();
516+
517+Q_SIGNALS:
518+ void flickableChanged();
519+ void exposedChanged();
520+ void movingChanged();
521+
522+protected:
523+ void show();
524+ void hide();
525+
526+private Q_SLOTS:
527+ void _q_scrolledContents();
528+ void _q_showHideAnimationRunningChanged();
529+ void _q_flickableMovementEnded();
530+ void _q_contentHeightChanged();
531+ void _q_flickableInteractiveChanged();
532+ void _q_heightChanged();
533+
534+private:
535+ QPointer<QQuickFlickable> m_flickable;
536+ QQuickNumberAnimation* m_showHideAnimation;
537+ PropertyChange* m_flickableTopMarginBackup;
538+
539+ qreal m_previous_contentY;
540+ bool m_exposed:1;
541+ bool m_moving:1;
542+
543+ // used to set the easing and duration of m_showHideAnimation
544+ static UCUbuntuAnimation *s_ubuntuAnimation;
545+
546+ void updateFlickableMargins();
547+};
548+
549+#endif // UCHEADER_H
550
551=== added file 'tests/unit_x11/tst_components/tst_header.qml'
552--- tests/unit_x11/tst_components/tst_header.qml 1970-01-01 00:00:00 +0000
553+++ tests/unit_x11/tst_components/tst_header.qml 2015-09-23 11:35:46 +0000
554@@ -0,0 +1,354 @@
555+/*
556+ * Copyright (C) 2015 Canonical Ltd.
557+ *
558+ * This program is free software; you can redistribute it and/or modify
559+ * it under the terms of the GNU Lesser General Public License as published by
560+ * the Free Software Foundation; version 3.
561+ *
562+ * This program is distributed in the hope that it will be useful,
563+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
564+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
565+ * GNU Lesser General Public License for more details.
566+ *
567+ * You should have received a copy of the GNU Lesser General Public License
568+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
569+ */
570+
571+import QtQuick 2.4
572+import Ubuntu.Components 1.3
573+import Ubuntu.Test 1.0
574+
575+Item {
576+ id: root
577+ width: units.gu(50)
578+ height: units.gu(70)
579+
580+ property real initialHeaderHeight: units.gu(6)
581+
582+ Header {
583+ id: header
584+ flickable: flickable
585+ z:1
586+ width: parent.width
587+ height: root.initialHeaderHeight
588+
589+ Rectangle {
590+ // to visualize the header
591+ anchors.fill: parent
592+ color: UbuntuColors.red
593+ opacity: 0.5
594+ border {
595+ color: "black"
596+ width: 2
597+ }
598+ }
599+ }
600+
601+ Flickable {
602+ id: flickable
603+ anchors.fill: parent
604+ contentHeight: height * 2
605+
606+ Grid {
607+ id: switchGrid
608+ columns: 2
609+ spacing: units.gu(1)
610+ anchors {
611+ top: parent.top
612+ left: parent.left
613+ margins: units.gu(5)
614+ }
615+ Switch {
616+ id: lockedSwitch
617+ checked: null === header.flickable
618+ function trigger() {
619+ if (header.flickable) {
620+ header.flickable = null;
621+ } else {
622+ header.flickable = flickable;
623+ }
624+ }
625+ }
626+ Label {
627+ text: "header locked"
628+ }
629+ Switch {
630+ id: hiddenSwitch
631+ checked: header.exposed
632+ function trigger() {
633+ header.exposed = !header.exposed;
634+ }
635+ }
636+ Label {
637+ text: "header exposed"
638+ }
639+ Item {
640+ width: 1
641+ height: 1
642+ }
643+ }
644+ Button {
645+ id: contentYButton
646+ anchors {
647+ top: switchGrid.bottom
648+ topMargin: units.gu(4)
649+ horizontalCenter: parent.horizontalCenter
650+ }
651+ property real newY: flickable.contentY == 0 ? -header.height : 0
652+ onClicked: flickable.contentY = newY;
653+ text: "Set contentY to " + newY
654+ }
655+ Label {
656+ anchors {
657+ top : contentYButton.bottom
658+ horizontalCenter: parent.horizontalCenter
659+ topMargin: units.gu(8)
660+ }
661+ text: "Flick me"
662+ }
663+ }
664+
665+ Rectangle {
666+ id: reparentTestItem
667+ anchors {
668+ right: parent.right
669+ bottom: parent.bottom
670+ }
671+ height: units.gu(15)
672+ width: parent.width / 2
673+ color: "blue"
674+
675+ Label {
676+ anchors {
677+ horizontalCenter: parent.horizontalCenter
678+ bottom: parent.bottom
679+ }
680+ text: "Click to reparent"
681+ color: "white"
682+ }
683+
684+ MouseArea {
685+ anchors.fill: parent
686+ onClicked: {
687+ if (header.parent === root) {
688+ header.parent = reparentTestItem;
689+ } else {
690+ header.parent = root;
691+ }
692+ }
693+ }
694+ }
695+
696+ Flickable {
697+ id: otherFlickable
698+ property real initialTopMargin: 123
699+ topMargin: initialTopMargin
700+ height: units.gu(10)
701+ contentHeight: units.gu(20);
702+ }
703+
704+ Header {
705+ id: otherHeader
706+ }
707+
708+ UbuntuTestCase {
709+ name: "Header"
710+ when: windowShown
711+ id: testCase
712+
713+ function initTestCase() {
714+ wait_for_exposed(true, "Header is not exposed initially.");
715+ compare(otherHeader.flickable, null, "Flickable not null by default.");
716+ compare(header.flickable, flickable, "Flickable not properly intialized.");
717+ // note: moving may be true briefly due to header height changes, but
718+ // it does not change in the initialization after wait_for_exposed() above.
719+ compare(header.moving, false, "Header moving initially.");
720+ }
721+
722+ function init() {
723+ flickable.contentHeight = 2*flickable.height;
724+ flickable.interactive = true;
725+ flickable.contentY = -header.height;
726+ header.exposed = true;
727+ wait_for_exposed(true);
728+ }
729+
730+ function scroll(dy) {
731+ var p = centerOf(flickable);
732+ // Use mouseWheel to scroll because mouseDrag is very unreliable
733+ // and does not properly handle negative values for dy.
734+ mouseWheel(flickable, p.x, p.y, 0,dy);
735+ }
736+
737+ function scroll_down() {
738+ scroll(-2.0*header.height);
739+ }
740+
741+ function scroll_up() {
742+ scroll(header.height);
743+ }
744+
745+ function wait_for_exposed(exposed, errorMessage) {
746+ tryCompare(header, "exposed", exposed, 5000, errorMessage);
747+ // wait for the animation to finish:
748+ tryCompare(header, "moving", false, 5000, "Header still moving?");
749+ if (exposed) {
750+ compare(header.y, 0, errorMessage +
751+ " y-value/exposed mismatch for exposed header!");
752+ } else {
753+ compare(header.y, -header.height, errorMessage +
754+ " y-value/exposed mismatch for hidden header!");
755+ }
756+ }
757+
758+ function test_reparent_width() {
759+ // test initial header width:
760+ compare(header.parent, root);
761+ compare(header.width, root.width);
762+ compare(header.y, 0);
763+
764+ // test width update when changing parent:
765+ header.parent = reparentTestItem;
766+ compare(header.parent, reparentTestItem);
767+ compare(header.width, reparentTestItem.width);
768+ compare(header.y, 0);
769+
770+ // test width update when changing width of parent:
771+ var old_width = reparentTestItem.width;
772+ reparentTestItem.width = units.gu(5);
773+ compare(header.width, reparentTestItem.width);
774+ compare(header.y, 0);
775+
776+ // revert to original parent:
777+ header.parent = root;
778+ compare(header.parent, root);
779+ compare(header.width, root.width);
780+ compare(header.y, 0);
781+ reparentTestItem.width = old_width;
782+ }
783+
784+ function test_height_change() {
785+ // first scroll down for this test, the following test repeats
786+ // the cases at the top of the flickable.
787+ scroll_down();
788+ header.height = units.gu(15);
789+ wait_for_exposed(true, "Increasing header height hides header.");
790+ scroll_down();
791+ header.exposed = false;
792+ wait_for_exposed(false, "Header with height set does not hide.");
793+ header.height = units.gu(2);
794+ wait_for_exposed(false, "Decreasing header height exposes it.");
795+ header.exposed = true;
796+ wait_for_exposed(true, "Header with decreased height does not expose.");
797+
798+ // revert to initial state
799+ header.height = root.initialHeaderHeight;
800+ flickable.contentY = -header.height;
801+ wait_for_exposed(true, "Setting flickable.contentY hides the header.");
802+ }
803+
804+ function test_height_change_at_top() {
805+ // Near the top, changing the header height exposes the header
806+ // to avoid the header becoming inaccessible because it cannot
807+ // be pulled down.
808+ header.exposed = false;
809+ wait_for_exposed(false);
810+ header.height = units.gu(15);
811+ wait_for_exposed(true, "Increasing header height at top hides header.");
812+
813+ // making the header smaller does not need to expose it, because there is
814+ // enough space to pull it down.
815+
816+ // revert to original state.
817+ header.height = root.initialHeaderHeight;
818+ flickable.contentY = -header.height;
819+ header.exposed = true;
820+ wait_for_exposed(true);
821+ }
822+
823+ function test_set_exposed_to_hide_and_show() {
824+ header.exposed = false;
825+ wait_for_exposed(false, "Cannot hide header by setting visible to false.");
826+ header.exposed = true;
827+ wait_for_exposed(true, "Cannot show header by setting visible to true.");
828+
829+ // change the value of exposed twice quickly:
830+ header.exposed = false;
831+ header.exposed = true;
832+ wait_for_exposed(true, "Quickly hiding and showing header does not result in exposed header.");
833+
834+ // and the other way around:
835+ header.exposed = false;
836+ wait_for_exposed(false);
837+ header.exposed = true;
838+ header.exposed = false;
839+ wait_for_exposed(false, "Quickly showing and hiding header does not result in hidden header.");
840+
841+ header.exposed = true;
842+ wait_for_exposed(true);
843+ }
844+
845+ function test_scroll_updates_visible() {
846+ scroll_down();
847+ wait_for_exposed(false, "Scrolling down does not hide header.");
848+ scroll_up();
849+ wait_for_exposed(true, "Scrolling up does not show header.");
850+ }
851+
852+ function test_flickable_margins() {
853+ compare(flickable.topMargin, header.height, "Flickable top margin does not match header height.");
854+ header.height = units.gu(15);
855+ wait_for_exposed(true, "Increasing header height at top hides header.");
856+ compare(flickable.topMargin, header.height, "Updating header height does not update flickable top margin.");
857+
858+ header.height = root.initialHeaderHeight; // revert
859+ wait_for_exposed(true, "Reverting header height at top hides header.");
860+ compare(flickable.topMargin, header.height, "Reverting header height does not revert flickable top margin.");
861+
862+ compare(otherFlickable.topMargin, otherFlickable.initialTopMargin, "Flickable top margin is not initialized properly.");
863+ header.flickable = otherFlickable;
864+ compare(otherFlickable.topMargin, header.height, "Setting flickable does not update flickable top margin.");
865+ compare(flickable.topMargin, 0, "Changing the flickable does not reset the previous flickable top margin to 0.");
866+
867+ header.flickable = flickable;
868+ compare(otherFlickable.topMargin, otherFlickable.initialTopMargin, "Reverting flickable does not restore the other flickable top margin.");
869+ compare(flickable.topMargin, header.height, "Reverting flickable breaks flickable top margin.");
870+ }
871+
872+ function test_flickable_contentHeight_bug1156573() {
873+ var old_height = flickable.contentHeight;
874+ header.exposed = false;
875+ wait_for_exposed(false);
876+ flickable.contentHeight = flickable.height / 2;
877+ wait_for_exposed(true, "Small content height does not expose the header.");
878+
879+ // revert:
880+ flickable.contentHeight = old_height;
881+ compare(header.exposed, true, "Reverting flickable content height hides the header.");
882+ }
883+
884+ function test_flickable_interactive() {
885+ header.exposed = false;
886+ wait_for_exposed(false);
887+ flickable.interactive = false;
888+ wait_for_exposed(true, "Making flickable not interactive does not expose the header.");
889+
890+ // revert:
891+ flickable.interactive = true;
892+ compare(header.exposed, true, "Reverting flickable exposed hides the header.");
893+ }
894+
895+ function test_scroll_disconnected_flickable() {
896+ var hy = header.y;
897+ header.flickable = null;
898+ scroll_down();
899+ compare(header.y, hy, "Header scrolls when disconnected flickable scrolls down.");
900+ wait_for_exposed(true, "Scrolling down disconnected flickable hides header.");
901+ scroll_up();
902+ compare(header.y, hy, "Header scrolls when disconnected flickable scrolls up.");
903+ wait_for_exposed(true, "Scrolling up disconnected flickable hides header.");
904+
905+ header.flickable = flickable;
906+ }
907+ }
908+}

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