62 lines
1.4 KiB
QML
62 lines
1.4 KiB
QML
// Copyright (C) 2019 The Qt Company Ltd.
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// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
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import QtQuick 2.4
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import QtTest 1.1
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Item {
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id: root
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width: 500
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height: 500
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Timer {
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id: timer
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interval: 1
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running: true
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repeat: true
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onTriggered: {
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if (myCanvas.parent == root) {
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myCanvas.parent = null
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} else {
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myCanvas.parent = root
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}
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}
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}
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Canvas {
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id: myCanvas
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anchors.fill: parent
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property var paintContext: null
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function doPaint() {
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paintContext.fillStyle = Qt.rgba(1, 0, 0, 1);
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paintContext.fillRect(0, 0, width, height);
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requestAnimationFrame(doPaint);
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}
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onAvailableChanged: {
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if (available) {
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paintContext = getContext("2d")
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requestAnimationFrame(doPaint);
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}
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}
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}
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TestCase {
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name: "invalidContext"
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when: myCanvas.parent === null && myCanvas.paintContext !== null
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function test_paintContextInvalid() {
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verify(myCanvas.paintContext);
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var caught = false;
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try {
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console.log(myCanvas.paintContext.fillStyle);
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} catch(e) {
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caught = true;
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}
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verify(caught);
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timer.running = false
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}
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}
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}
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