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Diffstat (limited to 'src/quick/jar/org/qtproject/qt/android/QtQuickView.java')
-rw-r--r-- | src/quick/jar/org/qtproject/qt/android/QtQuickView.java | 264 |
1 files changed, 264 insertions, 0 deletions
diff --git a/src/quick/jar/org/qtproject/qt/android/QtQuickView.java b/src/quick/jar/org/qtproject/qt/android/QtQuickView.java new file mode 100644 index 0000000000..0f8e999d96 --- /dev/null +++ b/src/quick/jar/org/qtproject/qt/android/QtQuickView.java @@ -0,0 +1,264 @@ +// Copyright (C) 2024 The Qt Company Ltd. +// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only + +package org.qtproject.qt.android; + +import android.content.Context; +import android.view.View; +import android.view.ViewGroup; +import android.util.Log; + +import java.security.InvalidParameterException; + +/** + * The QtQuickView class lets you easily add QML content to your Android app as a + * {@link android.view.View View}. QtQuickView instantiates a QQuickView with a given + * QML component source URI path and embeds it inside itself. You can add it in your Android app's + * layout as with any other View. QtQuickView is a good choice when you want to extend your non-Qt + * Android app with QML content but do not want to make the entire app using the Qt framework. + * It brings the power of Qt Quick into your Android app, making it possible to use various Qt Quick + * APIs, in Android Java or Kotlin apps. + * </p> + * <b>Note:</b> This class is a technical preview. It is subject to change, and no source nor + * binary compatibility guarantees exist. + * <p> + * <b>Known limitations:</b> + * <p><ul> + * <li> Only CMake is supported, not qmake. + * <li> Only one QtQuickView can be added to your app, adding multiple outcomes unknown. + * </ul><p> + * @see <a href="https://doc.qt.io/qt-6/qquickview.html">Qt QQuickView</a> + **/ +public class QtQuickView extends QtView { + private final static String TAG = "QtQuickView"; + + /** + * A callback that notifies clients when a signal is emitted from the QML root object. + **/ + @FunctionalInterface + public interface SignalListener<T> + { + /** + * Called on the Android UI thread when the signal has been emitted. + * @param signalName literal signal name + * @param value the value delivered by the signal or null if the signal is parameterless + **/ + void onSignalEmitted(String signalName, T value); + } + + /** + * A callback that notifies clients about the status of QML loading. + **/ + public interface StatusChangeListener + { + /** + * Called on the Android UI thread when the QML component status has changed. + * @param status The current status. The status can be STATUS_NULL, STATUS_READY, + * STATUS_LOADING or STATUS_ERROR. + **/ + void onStatusChanged(int status); + } + + /** + * QML loading status: No source is set or the root object has not been created yet. + **/ + public static final int STATUS_NULL = 0; + /** + * QML loading status: The QML view is loaded and the root object is available. + * Invoking methods that operate on the QML root object, i.e. + * {@link QtQuickView#setProperty() setProperty}, {@link QtQuickView#getProperty() getProperty}, + * and {@link QtQuickView#addSignalListener() addSignalListener} would succeed <b>only<b> if + * the current status is ready. + **/ + public static final int STATUS_READY = 1; + /** + * QML loading status: The QML view is loading the root object from network. + **/ + public static final int STATUS_LOADING = 2; + /** + * QML loading status: One or more errors has occurred. + **/ + public static final int STATUS_ERROR = 3; + + private String m_qmlUri; + private String[] m_qmlImportPaths = null; + private StatusChangeListener m_statusChangeListener = null; + private int m_lastStatus = STATUS_NULL; + private boolean m_hasQueuedStatus = false; + + native void createQuickView(String qmlUri, int width, int height, long parentWindowReference, + String[] qmlImportPaths); + native void setRootObjectProperty(long windowReference, String propertyName, Object value); + native Object getRootObjectProperty(long windowReference, String propertyName); + native int addRootObjectSignalListener(long windowReference, String signalName, Class argType, + Object listener); + native boolean removeRootObjectSignalListener(long windowReference, int signalListenerId); + + /** + * Creates a QtQuickView to load and view a QML component. Instantiating a QtQuickView will load + * the Qt libraries, including the app library specified by <code>appName</code>. Then it + * creates a QQuickView that loads the QML source specified by <code>qmlUri</code>. + * <p> + * @param context the parent Context + * @param qmlUri the URI of the main QML file + * @param appName the name of the Qt app library to load and start. This corresponds to the + * target name set in Qt app's CMakeLists.txt + * @throws InvalidParameterException if either qmlUri or appName is empty or null + * @see <a href="https://doc.qt.io/qt-6/qquickview.html">Qt QQuickView</a> + **/ + public QtQuickView(Context context, String qmlUri, String appName) + throws InvalidParameterException { + this(context, qmlUri, appName, null); + } + + /** + * Creates a QtQuickView to load and view a QML component. Instantiating a QtQuickView will load + * the Qt libraries, including the app library specified by appName. Then it creates a + * QQuickView that loads the QML source specified by qmlUri. This overload accepts an array of + * strings in the case where the QML application should load QML modules from custom paths. + * <p> + * @param context the parent Context + * @param qmlUri the URI of the main QML file + * @param appName the name of the Qt app library to load and start. This corresponds to + * the target name set in the Qt app's CMakeLists.txt + * @param qmlImportPaths an array of strings for additional import paths to be passed to + QQmlEngine, or null if additional import paths are not required + * @throws InvalidParameterException if either qmlUri or appName is empty or null + * @see <a href="https://doc.qt.io/qt-6/qqmlengine.html">Qt QQmlEngine</a> + **/ + public QtQuickView(Context context, String qmlUri, String appName, String[] qmlImportPaths) + throws InvalidParameterException + { + super(context, appName); + if (qmlUri == null || qmlUri.isEmpty()) { + throw new InvalidParameterException( + "QtQuickView: argument 'qmlUri' may not be empty or null"); + } + m_qmlUri = qmlUri; + m_qmlImportPaths = qmlImportPaths; + } + + @Override + protected void createWindow(long parentWindowReference) { + createQuickView(m_qmlUri, getWidth(), getHeight(), parentWindowReference, m_qmlImportPaths); + } + + /** + * Sets the value of an existing property on the QML root object. The supported types are + * {@link java.lang.Integer}, {@link java.lang.Double}, {@link java.lang.Float}, + * {@link java.lang.Boolean} and {@link java.lang.String}. These types get converted to their + * corresponding QML types int, double/float, bool and string. This function does not add + * properties to the QML root object if they do not exist, but prints a warning. + * <p> + * @param propertyName the name of the existing root object property to set the value of + * @param value the value to set the property to + * @see <a href="https://doc.qt.io/qt-6/qml-int.html">QML int</a>, + * @see <a href="https://doc.qt.io/qt-6/qml-double.html">QML double/float</a>, + * @see <a href="https://doc.qt.io/qt-6/qml-bool.html">QML bool</a>, + * @see <a href="https://doc.qt.io/qt-6/qml-string.html">QML string</a>. + **/ + public void setProperty(String propertyName, Object value) + { + setRootObjectProperty(windowReference(), propertyName, value); + } + + /** + * Gets the value of an existing property of the QML root object. The supported types are + * {@link java.lang.Integer}, {@link java.lang.Double}, {@link java.lang.Float}, + * {@link java.lang.Boolean} and {@link java.lang.String}. These types get converted to their + * corresponding QML types int, double/float, bool and string. If the property does not + * exist or the status of the QML component is anything other than + * {@link QtQuickView#STATUS_READY STATUS_READY}, this function will return null. + * <p> + * @param propertyName the name of the existing root object property + * @throws ClassCastException if the returned type could not be casted to the requested type. + * @see <a href="https://doc.qt.io/qt-6/qml-int.html">QML int</a>, + * @see <a href="https://doc.qt.io/qt-6/qml-double.html">QML double/float</a>, + * @see <a href="https://doc.qt.io/qt-6/qml-bool.html">QML bool</a>, + * @see <a href="https://doc.qt.io/qt-6/qml-string.html">QML string</a>. + **/ + // getRootObjectProperty always returns a primitive type or an Object + // so it is safe to suppress the unchecked warning + @SuppressWarnings("unchecked") + public <T> T getProperty(String propertyName) + { + return (T)getRootObjectProperty(windowReference(), propertyName); + } + + /** + * Connects a SignalListener to a signal of the QML root object. + * <p> + * @param signalName the name of the root object signal + * @param argType the Class type of the signal argument + * @param listener an instance of the SignalListener interface + * @return a connection id between signal and listener or the existing connection id if there is + * an existing connection between the same signal and listener. Return a negative value + * if the signal does not exists on the QML root object. + **/ + public <T> int connectSignalListener(String signalName, Class<T> argType, + SignalListener<T> listener) + { + int signalListenerId = + addRootObjectSignalListener(windowReference(), signalName, argType, listener); + if (signalListenerId < 0) { + Log.w(TAG, "The signal " + signalName + " does not exist in the root object " + + "or the arguments do not match with the listener."); + } + return signalListenerId; + } + + /** + * Disconnects a SignalListener with a given id obtained from + * {@link QtQuickView#connectSignalListener() connectSignalListener} call, from listening to + * a signal. + * <p> + * @param signalListenerId the connection id + * @return Returns true if the connection id is valid and has been successfuly removed, + * otherwise returns false. + **/ + public boolean disconnectSignalListener(int signalListenerId) + { + return removeRootObjectSignalListener(windowReference(), signalListenerId); + } + + /** + * Gets the status of the QML component. + * <p> + * @return Returns STATUS_READY when the QML component is ready. Invoking methods that operate + * on the QML root object ({@link QtQuickView#setProperty() setProperty}, + * {@link QtQuickView#getProperty() getProperty}, and + * {@link QtQuickView#addSignalListener() addSignalListener}) would succeed <b>only</b> + * if the current STATUS_READY. It can also return STATUS_NULL, STATUS_LOADING, or + * STATUS_ERROR based on the status of see underlaying + * @see <a href="https://doc.qt.io/qt-6/qquickview.html">QQuickView</a> instance. + **/ + public int getStatus() + { + return m_lastStatus; + } + + /** + * Sets a StatusChangeListener to listen to status changes. + * <p> + * @param listener an instance of a StatusChangeListener interface + **/ + public void setStatusChangeListener(StatusChangeListener listener) + { + m_statusChangeListener = listener; + + if (m_hasQueuedStatus) { + QtNative.runAction(() -> { m_statusChangeListener.onStatusChanged(m_lastStatus); }); + m_hasQueuedStatus = false; + } + } + + private void handleStatusChange(int status) + { + m_lastStatus = status; + + if (m_statusChangeListener != null) + QtNative.runAction(() -> { m_statusChangeListener.onStatusChanged(status); }); + else + m_hasQueuedStatus = true; + } +} |