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Diffstat (limited to 'examples/qml/tutorials/extending-qml-advanced/advanced6-Property-value-source')
8 files changed, 319 insertions, 0 deletions
diff --git a/examples/qml/tutorials/extending-qml-advanced/advanced6-Property-value-source/People/Main.qml b/examples/qml/tutorials/extending-qml-advanced/advanced6-Property-value-source/People/Main.qml new file mode 100644 index 000000000..254265a80 --- /dev/null +++ b/examples/qml/tutorials/extending-qml-advanced/advanced6-Property-value-source/People/Main.qml @@ -0,0 +1,27 @@ +// Copyright (C) 2022 The Qt Company Ltd. +// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause + +import People + +BirthdayParty { + HappyBirthdaySong on announcement { name: "Bob Jones" } + + onPartyStarted: (time) => { console.log("This party started rockin' at " + time); } + + host: Boy { + name: "Bob Jones" + shoe_size: 12 + } + + Boy { + name: "Leo Hodges" + BirthdayParty.rsvp: "2009-07-06" + } + Boy { + name: "Jack Smith" + } + Girl { + name: "Anne Brown" + BirthdayParty.rsvp: "2009-07-01" + } +} diff --git a/examples/qml/tutorials/extending-qml-advanced/advanced6-Property-value-source/People/qmldir b/examples/qml/tutorials/extending-qml-advanced/advanced6-Property-value-source/People/qmldir new file mode 100644 index 000000000..a2bd9515a --- /dev/null +++ b/examples/qml/tutorials/extending-qml-advanced/advanced6-Property-value-source/People/qmldir @@ -0,0 +1,3 @@ +module People +typeinfo coercion.qmltypes +Main 1.0 Main.qml diff --git a/examples/qml/tutorials/extending-qml-advanced/advanced6-Property-value-source/advanced6-Property-value-source.pyproject b/examples/qml/tutorials/extending-qml-advanced/advanced6-Property-value-source/advanced6-Property-value-source.pyproject new file mode 100644 index 000000000..fe2980fa9 --- /dev/null +++ b/examples/qml/tutorials/extending-qml-advanced/advanced6-Property-value-source/advanced6-Property-value-source.pyproject @@ -0,0 +1,4 @@ +{ + "files": ["main.py", "birthdayparty.py", "happybirthdaysong.py", "person.py", + "People/Main.qml", "People/qmldir"] +} diff --git a/examples/qml/tutorials/extending-qml-advanced/advanced6-Property-value-source/birthdayparty.py b/examples/qml/tutorials/extending-qml-advanced/advanced6-Property-value-source/birthdayparty.py new file mode 100644 index 000000000..eacb5201d --- /dev/null +++ b/examples/qml/tutorials/extending-qml-advanced/advanced6-Property-value-source/birthdayparty.py @@ -0,0 +1,89 @@ +# Copyright (C) 2022 The Qt Company Ltd. +# SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause + +from PySide6.QtCore import QDate, QObject, ClassInfo, Property, QTime, Signal +from PySide6.QtQml import QmlAnonymous, QmlAttached, QmlElement, ListProperty + +from person import Person + + +# To be used on the @QmlElement decorator +# (QML_IMPORT_MINOR_VERSION is optional) +QML_IMPORT_NAME = "People" +QML_IMPORT_MAJOR_VERSION = 1 + + +@QmlAnonymous +class BirthdayPartyAttached(QObject): + rsvp_changed = Signal() + + def __init__(self, parent=None): + super().__init__(parent) + self._rsvp = QDate() + + @Property(QDate, notify=rsvp_changed, final=True) + def rsvp(self): + return self._rsvp + + @rsvp.setter + def rsvp(self, d): + if self._rsvp != d: + self._rsvp = d + self.rsvp_changed.emit() + + +@QmlElement +@ClassInfo(DefaultProperty="guests") +@QmlAttached(BirthdayPartyAttached) +class BirthdayParty(QObject): + + announcement_changed = Signal() + host_changed = Signal() + guests_changed = Signal() + partyStarted = Signal(QTime) + + def __init__(self, parent=None): + super().__init__(parent) + self._announcement = "" + self._host = None + self._guests = [] + + def startParty(self): + self.partyStarted.emit(QTime.currentTime()) + + @Property(Person, notify=host_changed, final=True) + def host(self): + return self._host + + @host.setter + def host(self, h): + if self._host != h: + self._host = h + self.host_changed.emit() + + @Property(str, notify=announcement_changed, final=True) + def announcement(self): + return self._announcement + + @announcement.setter + def announcement(self, a): + if self._announcement != a: + self._announcement = a + self.announcement_changed.emit() + print(a) + + def guest(self, n): + return self._guests[n] + + def guestCount(self): + return len(self._guests) + + def appendGuest(self, guest): + self._guests.append(guest) + self.guests_changed.emit() + + @staticmethod + def qmlAttachedProperties(self, o): + return BirthdayPartyAttached(o) + + guests = ListProperty(Person, appendGuest, notify=guests_changed, final=True) diff --git a/examples/qml/tutorials/extending-qml-advanced/advanced6-Property-value-source/doc/advanced6-Property-value-source.rst b/examples/qml/tutorials/extending-qml-advanced/advanced6-Property-value-source/doc/advanced6-Property-value-source.rst new file mode 100644 index 000000000..4e1dc393a --- /dev/null +++ b/examples/qml/tutorials/extending-qml-advanced/advanced6-Property-value-source/doc/advanced6-Property-value-source.rst @@ -0,0 +1,43 @@ +.. _qml-advanced/advanced6-property-value-source: + +Extending QML (advanced) - Property Value Source +================================================ + +This is the last of a series of 6 examples forming a tutorial using the example +of a birthday party to demonstrate some of the advanced features of QML. + +During the party the guests have to sing for the host. It would be handy if the +program could display the lyrics customized for the occasion to help the +guests. To this end, a property value source is used to generate the verses of +the song over time. + +.. literalinclude:: happybirthdaysong.py + :lineno-start: 13 + :lines: 13-49 + +The class ``HappyBirthdaySong`` is added as a value source. It must inherit +from ``QQmlPropertyValueSource`` and implement its interface. The +``setTarget()`` function is used to define which property this source acts +upon. In this case, the value source writes to the ``announcement`` property of +the ``BirthdayParty`` to display the lyrics over time. It has an internal timer +that causes the ``announcement`` property of the party to be set to the next +line of the lyrics repeatedly. + +In QML, a ``HappyBirthdaySong`` is instantiated inside the ``BirthdayParty``. +The ``on`` keyword in its signature is used to specify the property that the +value source targets, in this case ``announcement``. The ``name`` property of +the ``HappyBirthdaySong`` object is also bound to the name of the host of the +party. + +.. literalinclude:: People/Main.qml + :lineno-start: 6 + :lines: 6-7 + +The program displays the time at which the party started using the +``partyStarted`` signal and then prints the following happy birthday verses +over and over:: + + Happy birthday to you, + Happy birthday to you, + Happy birthday dear Bob Jones, + Happy birthday to you! diff --git a/examples/qml/tutorials/extending-qml-advanced/advanced6-Property-value-source/happybirthdaysong.py b/examples/qml/tutorials/extending-qml-advanced/advanced6-Property-value-source/happybirthdaysong.py new file mode 100644 index 000000000..c35f9bffa --- /dev/null +++ b/examples/qml/tutorials/extending-qml-advanced/advanced6-Property-value-source/happybirthdaysong.py @@ -0,0 +1,49 @@ +# Copyright (C) 2022 The Qt Company Ltd. +# SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause + +from PySide6.QtCore import QTimer, Property, Signal, Slot +from PySide6.QtQml import QmlElement, QPyQmlPropertyValueSource + +# To be used on the @QmlElement decorator +# (QML_IMPORT_MINOR_VERSION is optional) +QML_IMPORT_NAME = "People" +QML_IMPORT_MAJOR_VERSION = 1 + + +@QmlElement +class HappyBirthdaySong(QPyQmlPropertyValueSource): + name_changed = Signal() + + def __init__(self, parent=None): + super().__init__(parent) + + self.m_target = None + self.m_name = "" + self.m_line = -1 + self.m_lyrics = [] + + self.m_timer = QTimer(self) + self.m_timer.timeout.connect(self.advance) + self.m_timer.start(1000) + + def setTarget(self, property): + self.m_target = property + + @Property(str, notify=name_changed, final=True) + def name(self): + return self.m_name + + @name.setter + def name(self, n): + if self.m_name != n: + self.m_name = n + self.m_lyrics = ["Happy birthday to you,", + "Happy birthday to you,", + f"Happy birthday dear {self.m_name},", + "Happy birthday to you!", + ""] + + @Slot() + def advance(self): + self.m_line = (self.m_line + 1) % len(self.m_lyrics) + self.m_target.write(self.m_lyrics[self.m_line]) diff --git a/examples/qml/tutorials/extending-qml-advanced/advanced6-Property-value-source/main.py b/examples/qml/tutorials/extending-qml-advanced/advanced6-Property-value-source/main.py new file mode 100644 index 000000000..ea412a547 --- /dev/null +++ b/examples/qml/tutorials/extending-qml-advanced/advanced6-Property-value-source/main.py @@ -0,0 +1,53 @@ +# Copyright (C) 2022 The Qt Company Ltd. +# SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause + +"""PySide6 port of the + qml/examples/qml/tutorials/extending-qml-advanced/advanced6-Property-value-source example + from Qt v6.x""" + +from pathlib import Path +import sys + +from PySide6.QtCore import QCoreApplication +from PySide6.QtQml import QQmlComponent, QQmlEngine, qmlAttachedPropertiesObject + +from person import Boy, Girl # noqa: F401 +from birthdayparty import BirthdayParty +from happybirthdaysong import HappyBirthdaySong # noqa: F401 + + +app = QCoreApplication(sys.argv) +engine = QQmlEngine() +engine.addImportPath(Path(__file__).parent) +component = QQmlComponent(engine) +component.loadFromModule("People", "Main") +party = component.create() +if not party: + print(component.errors()) + del engine + sys.exit(-1) +host = party.host +print(f"{host.name} is having a birthday!") +if isinstance(host, Boy): + print("He is inviting:") +else: + print("She is inviting:") +for g in range(party.guestCount()): + guest = party.guest(g) + name = guest.name + + rsvp_date = None + attached = qmlAttachedPropertiesObject(BirthdayParty, guest, False) + if attached: + rsvp_date = attached.rsvp.toString() + if rsvp_date: + print(f" {name} RSVP date: {rsvp_date}") + else: + print(f" {name} RSVP date: Hasn't RSVP'd") + +party.startParty() + +r = app.exec() + +del engine +sys.exit(r) diff --git a/examples/qml/tutorials/extending-qml-advanced/advanced6-Property-value-source/person.py b/examples/qml/tutorials/extending-qml-advanced/advanced6-Property-value-source/person.py new file mode 100644 index 000000000..503aaf65e --- /dev/null +++ b/examples/qml/tutorials/extending-qml-advanced/advanced6-Property-value-source/person.py @@ -0,0 +1,51 @@ +# Copyright (C) 2022 The Qt Company Ltd. +# SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause + +from PySide6.QtCore import QObject, Property, Signal +from PySide6.QtQml import QmlAnonymous, QmlElement + +# To be used on the @QmlElement decorator +# (QML_IMPORT_MINOR_VERSION is optional) +QML_IMPORT_NAME = "People" +QML_IMPORT_MAJOR_VERSION = 1 + + +@QmlAnonymous +class Person(QObject): + name_changed = Signal() + shoe_size_changed = Signal() + + def __init__(self, parent=None): + super().__init__(parent) + self._name = '' + self._shoe_size = 0 + + @Property(str, notify=name_changed, final=True) + def name(self): + return self._name + + @name.setter + def name(self, n): + if self._name != n: + self._name = n + self.name_changed.emit() + + @Property(int, notify=shoe_size_changed, final=True) + def shoe_size(self): + return self._shoe_size + + @shoe_size.setter + def shoe_size(self, s): + self._shoe_size = s + + +@QmlElement +class Boy(Person): + def __init__(self, parent=None): + super().__init__(parent) + + +@QmlElement +class Girl(Person): + def __init__(self, parent=None): + super().__init__(parent) |