Add PdfLinkDelegate instead of link decoration style properties

This simplifies PdfStyle somewhat. PdfLinkDelegate could still be
replaced or augmented via file selectors, but we don't expect to
need to, since link delegates are already non-visual.

[ChangeLog][QtPDF] A PdfLinkDelegate will now be instantiated on top of
each hyperlink in the PdfMultiPageView, PdfScrollablePageView and
PdfPageView components, for event handling and to provide tapped() and
contextMenuRequested() signals. It is non-visual by default, but can be
customized, for example to draw underlines under hyperlinks if the PDF
documents are not expected to have them already.

Change-Id: Ib3726e7220a0c3858db564ca8d53a04625a11950
Reviewed-by: Richard Moe Gustavsen <richard.gustavsen@qt.io>

1 files changed, 193 insertions, 0 deletions

diff --git a/tests/manual/quick/pdf/underscoredLinks.qml b/tests/manual/quick/pdf/underscoredLinks.qml
new file mode 100644
index 000000000..845ffec37
--- /dev/null
+++ b/tests/manual/quick/pdf/underscoredLinks.qml
@@ -0,0 +1,193 @@
+/****************************************************************************
+**
+** Copyright (C) 2022 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the examples of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:BSD$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** BSD License Usage
+** Alternatively, you may use this file under the terms of the BSD license
+** as follows:
+**
+** "Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are
+** met:
+**   * Redistributions of source code must retain the above copyright
+**     notice, this list of conditions and the following disclaimer.
+**   * Redistributions in binary form must reproduce the above copyright
+**     notice, this list of conditions and the following disclaimer in
+**     the documentation and/or other materials provided with the
+**     distribution.
+**   * Neither the name of The Qt Company Ltd nor the names of its
+**     contributors may be used to endorse or promote products derived
+**     from this software without specific prior written permission.
+**
+**
+** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+import QtQuick
+import QtQuick.Controls
+import QtQuick.Dialogs
+import QtQuick.Pdf
+import QtQuick.Shapes
+
+ApplicationWindow {
+    id: root
+    width: 800
+    height: 940
+    color: "darkgrey"
+    title: doc.source
+    visible: true
+
+    property PdfDocument doc: PdfDocument { source: "test.pdf" }
+
+    Component.onCompleted: {
+        if (Application.arguments.length > 2)
+            doc.source = Application.arguments[Application.arguments.length - 1]
+    }
+    FileDialog {
+        id: fileDialog
+        title: "Open a PDF file"
+        nameFilters: [ "PDF files (*.pdf)" ]
+        onAccepted: doc.source = selectedFile
+    }
+    ScrollView {
+        anchors.fill: parent
+        contentWidth: paper.width
+        contentHeight: paper.height
+
+        Rectangle {
+            id: paper
+            width: image.width
+            height: image.height
+            PdfPageImage {
+                id: image
+                document: doc
+
+                property real zoomFactor: Math.sqrt(2)
+
+                Shortcut {
+                    sequence: StandardKey.MoveToNextPage
+                    enabled: image.currentFrame < image.frameCount - 1
+                    onActivated: image.currentFrame++
+                }
+                Shortcut {
+                    sequence: StandardKey.MoveToPreviousPage
+                    enabled: image.currentFrame > 0
+                    onActivated: image.currentFrame--
+                }
+                Shortcut {
+                    sequence: StandardKey.ZoomIn
+                    enabled: image.sourceSize.width < 5000
+                    onActivated: {
+                        image.sourceSize.width = image.implicitWidth * image.zoomFactor
+                        image.sourceSize.height = image.implicitHeight * image.zoomFactor
+                    }
+                }
+                Shortcut {
+                    sequence: StandardKey.ZoomOut
+                    enabled: image.width > 50
+                    onActivated: {
+                        image.sourceSize.width = image.implicitWidth / image.zoomFactor
+                        image.sourceSize.height = image.implicitHeight / image.zoomFactor
+                    }
+                }
+                Shortcut {
+                    sequence: "Ctrl+0"
+                    onActivated: image.sourceSize = undefined
+                }
+                Shortcut {
+                    sequence: StandardKey.Open
+                    onActivated: fileDialog.open()
+                }
+                Shortcut {
+                    sequence: StandardKey.Quit
+                    onActivated: Qt.quit()
+                }
+            }
+
+            Menu {
+                id: linkContextMenu
+                property var currentLink
+                MenuItem {
+                    text: "Go"
+                    onTriggered: {
+                        if (linkContextMenu.currentLink.page >= 0)
+                            image.currentFrame = linkContextMenu.currentLink.page
+                        else
+                            Qt.openUrlExternally(linkContextMenu.currentLink.url)
+                    }
+                }
+                MenuItem {
+                    text: "Copy"
+                    onTriggered: linkContextMenu.currentLink.copyToClipboard()
+                }
+            }
+
+            Repeater {
+                model: PdfLinkModel {
+                    id: linkModel
+                    document: doc
+                    page: image.currentFrame
+                }
+                delegate: PdfLinkDelegate {
+                    x: rect.x
+                    y: rect.y
+                    width: rect.width
+                    height: rect.height
+                    onTapped:
+                        (link) => {
+                            if (link.page >= 0)
+                                image.currentFrame = link.page
+                            else
+                                Qt.openUrlExternally(url)
+                        }
+                    onContextMenuRequested:
+                        (link) => {
+                            linkContextMenu.currentLink = link
+                            linkContextMenu.x = x
+                            linkContextMenu.y = y
+                            linkContextMenu.open()
+                        }
+                    Shape {
+                        anchors.fill: parent
+                        ShapePath {
+                            strokeWidth: 1
+                            strokeColor: palette.link
+                            strokeStyle: ShapePath.DashLine
+                            dashPattern: [ 1, 4 ]
+                            startX: 0; startY: height
+                            PathLine { x: width; y: height }
+                        }
+                    }
+                }
+            }
+        }
+    }
+    Label {
+        anchors { bottom: parent.bottom; right: parent.right; margins: 6 }
+        text: "page " + (image.currentFrame + 1) + " of " + doc.pageCount
+    }
+}