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/****************************************************************************
**
** Copyright (C) 2022 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtPDF module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** 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.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
** Qt Foundation. The licenses are as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-2.0.html and
** https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
import QtQuick
import QtQuick.Controls
import QtQuick.Pdf
import QtQuick.Shapes
/*!
\qmltype PdfMultiPageView
\inqmlmodule QtQuick.Pdf
\brief A complete PDF viewer component for scrolling through multiple pages.
PdfMultiPageView provides a PDF viewer component that offers a user
experience similar to many common PDF viewer applications. It supports
flicking through the pages in the entire document, with narrow gaps between
the page images.
PdfMultiPageView also supports selecting text and copying it to the
clipboard, zooming in and out, clicking an internal link to jump to another
section in the document, rotating the view, and searching for text. The
\l {PDF Multipage Viewer Example} demonstrates how to use these features
in an application.
The implementation is a QML assembly of smaller building blocks that are
available separately. In case you want to make changes in your own version
of this component, you can copy the QML, which is installed into the
\c QtQuick/Pdf/qml module directory, and modify it as needed.
\sa PdfPageView, PdfScrollablePageView, PdfStyle
*/
Item {
/*!
\qmlproperty PdfDocument PdfMultiPageView::document
A PdfDocument object with a valid \c source URL is required:
\snippet multipageview.qml 0
*/
required property PdfDocument document
/*!
\qmlproperty PdfDocument PdfMultiPageView::selectedText
The selected text.
*/
property string selectedText
/*!
\qmlmethod void PdfMultiPageView::selectAll()
Selects all the text on the \l {currentPage}{current page}, and makes it
available as the system \l {QClipboard::Selection}{selection} on systems
that support that feature.
\sa copySelectionToClipboard()
*/
function selectAll() {
const currentItem = tableView.itemAtCell(tableView.cellAtPos(root.width / 2, root.height / 2))
if (currentItem)
currentItem.selection.selectAll()
}
/*!
\qmlmethod void PdfMultiPageView::copySelectionToClipboard()
Copies the selected text (if any) to the
\l {QClipboard::Clipboard}{system clipboard}.
\sa selectAll()
*/
function copySelectionToClipboard() {
const currentItem = tableView.itemAtCell(tableView.cellAtPos(root.width / 2, root.height / 2))
console.log(lcMPV, "currentItem", currentItem, "sel", currentItem.selection.text)
if (currentItem)
currentItem.selection.copyToClipboard()
}
// --------------------------------
// page navigation
/*!
\qmlproperty int PdfMultiPageView::currentPage
\readonly
This property holds the zero-based page number of the page visible in the
scrollable view. If there is no current page, it holds -1.
This property is read-only, and is typically used in a binding (or
\c onCurrentPageChanged script) to update the part of the user interface
that shows the current page number, such as a \l SpinBox.
\sa PdfPageNavigator::currentPage
*/
property alias currentPage: pageNavigator.currentPage
/*!
\qmlproperty bool PdfMultiPageView::backEnabled
\readonly
This property indicates if it is possible to go back in the navigation
history to a previous-viewed page.
\sa PdfPageNavigator::backAvailable, back()
*/
property alias backEnabled: pageNavigator.backAvailable
/*!
\qmlproperty bool PdfMultiPageView::forwardEnabled
\readonly
This property indicates if it is possible to go to next location in the
navigation history.
\sa PdfPageNavigator::forwardAvailable, forward()
*/
property alias forwardEnabled: pageNavigator.forwardAvailable
/*!
\qmlmethod void PdfMultiPageView::back()
Scrolls the view back to the previous page that the user visited most
recently; or does nothing if there is no previous location on the
navigation stack.
\sa PdfPageNavigator::back(), currentPage, backEnabled
*/
function back() { pageNavigator.back() }
/*!
\qmlmethod void PdfMultiPageView::forward()
Scrolls the view to the page that the user was viewing when the back()
method was called; or does nothing if there is no "next" location on the
navigation stack.
\sa PdfPageNavigator::forward(), currentPage
*/
function forward() { pageNavigator.forward() }
/*!
\qmlmethod void PdfMultiPageView::goToPage(int page)
Scrolls the view to the given \a page number, if possible.
\sa PdfPageNavigator::jump(), currentPage
*/
function goToPage(page) {
if (page === pageNavigator.currentPage)
return
goToLocation(page, Qt.point(-1, -1), 0)
}
/*!
\qmlmethod void PdfMultiPageView::goToLocation(int page, point location, real zoom)
Scrolls the view to the \a location on the \a page, if possible,
and sets the \a zoom level.
\sa PdfPageNavigator::jump(), currentPage
*/
function goToLocation(page, location, zoom) {
if (zoom > 0) {
pageNavigator.jumping = true // don't call pageNavigator.update() because we will jump() instead
root.renderScale = zoom
pageNavigator.jumping = false
}
pageNavigator.jump(page, location, zoom) // actually jump
}
/*!
\qmlproperty int PdfMultiPageView::currentPageRenderingStatus
This property holds the \l {QtQuick::Image::status}{rendering status} of
the \l {currentPage}{current page}.
\sa PdfPageImage::status
*/
property int currentPageRenderingStatus: Image.Null
// --------------------------------
// page scaling
/*!
\qmlproperty real PdfMultiPageView::renderScale
This property holds the ratio of pixels to points. The default is \c 1,
meaning one point (1/72 of an inch) equals 1 logical pixel.
\sa PdfPageImage::status
*/
property real renderScale: 1
/*!
\qmlproperty real PdfMultiPageView::pageRotation
This property holds the clockwise rotation of the pages.
The default value is \c 0 degrees (that is, no rotation relative to the
orientation of the pages as stored in the PDF file).
\sa PdfPageImage::rotation
*/
property real pageRotation: 0
/*!
\qmlmethod void PdfMultiPageView::resetScale()
Sets \l renderScale back to its default value of \c 1.
*/
function resetScale() { root.renderScale = 1 }
/*!
\qmlmethod void PdfMultiPageView::scaleToWidth(real width, real height)
Sets \l renderScale such that the width of the first page will fit into a
viewport with the given \a width and \a height. If the page is not rotated,
it will be scaled so that its width fits \a width. If it is rotated +/- 90
degrees, it will be scaled so that its width fits \a height.
*/
function scaleToWidth(width, height) {
root.renderScale = width / (tableView.rot90 ? tableView.firstPagePointSize.height : tableView.firstPagePointSize.width)
}
/*!
\qmlmethod void PdfMultiPageView::scaleToPage(real width, real height)
Sets \l renderScale such that the whole first page will fit into a viewport
with the given \a width and \a height. The resulting \l renderScale depends
on \l pageRotation: the page will fit into the viewport at a larger size if
it is first rotated to have a matching aspect ratio.
*/
function scaleToPage(width, height) {
const windowAspect = width / height
const pageAspect = tableView.firstPagePointSize.width / tableView.firstPagePointSize.height
if (tableView.rot90) {
if (windowAspect > pageAspect) {
root.renderScale = height / tableView.firstPagePointSize.width
} else {
root.renderScale = width / tableView.firstPagePointSize.height
}
} else {
if (windowAspect > pageAspect) {
root.renderScale = height / tableView.firstPagePointSize.height
} else {
root.renderScale = width / tableView.firstPagePointSize.width
}
}
}
// --------------------------------
// text search
/*!
\qmlproperty PdfSearchModel PdfMultiPageView::searchModel
This property holds a PdfSearchModel containing the list of search results
for a given \l searchString.
\sa PdfSearchModel
*/
property alias searchModel: searchModel
/*!
\qmlproperty string PdfMultiPageView::searchString
This property holds the search string that the user may choose to search
for. It is typically used in a binding to the
\l {QtQuick.Controls::TextField::text}{text} property of a TextField.
\sa searchModel
*/
property alias searchString: searchModel.searchString
/*!
\qmlmethod void PdfMultiPageView::searchBack()
Decrements the
\l{PdfSearchModel::currentResult}{searchModel's current result}
so that the view will jump to the previous search result.
*/
function searchBack() { --searchModel.currentResult }
/*!
\qmlmethod void PdfMultiPageView::searchForward()
Increments the
\l{PdfSearchModel::currentResult}{searchModel's current result}
so that the view will jump to the next search result.
*/
function searchForward() { ++searchModel.currentResult }
LoggingCategory {
id: lcMPV
name: "qt.pdf.multipageview"
}
id: root
PdfStyle { id: style }
TableView {
id: tableView
property bool debug: false
property point jumpLocationMargin: Qt.point(10, 10) // px away from viewport edges
anchors.fill: parent
anchors.leftMargin: 2
model: modelInUse && root.document ? root.document.pageCount : 0
// workaround to make TableView do scheduleRebuildTable(RebuildOption::All) in cases when forceLayout() doesn't
property bool modelInUse: true
function rebuild() {
modelInUse = false
modelInUse = true
}
// end workaround
rowSpacing: 6
property real rotationNorm: Math.round((360 + (root.pageRotation % 360)) % 360)
property bool rot90: rotationNorm == 90 || rotationNorm == 270
onRot90Changed: forceLayout()
onHeightChanged: forceLayout()
onWidthChanged: forceLayout()
property size firstPagePointSize: document?.status === PdfDocument.Ready ? document.pagePointSize(0) : Qt.size(1, 1)
property real pageHolderWidth: Math.max(root.width, ((rot90 ? document?.maxPageHeight : document?.maxPageWidth) ?? 0) * root.renderScale)
columnWidthProvider: function(col) { return document ? pageHolderWidth + vscroll.width + 2 : 0 }
rowHeightProvider: function(row) { return (rot90 ? document.pagePointSize(row).width : document.pagePointSize(row).height) * root.renderScale }
delegate: Rectangle {
id: pageHolder
color: tableView.debug ? "beige" : "transparent"
Text {
visible: tableView.debug
anchors { right: parent.right; verticalCenter: parent.verticalCenter }
rotation: -90; text: pageHolder.width.toFixed(1) + "x" + pageHolder.height.toFixed(1) + "\n" +
image.width.toFixed(1) + "x" + image.height.toFixed(1)
}
property alias selection: selection
Rectangle {
id: paper
width: image.width
height: image.height
rotation: root.pageRotation
anchors.centerIn: pinch.active ? undefined : parent
property size pagePointSize: document.pagePointSize(index)
property real pageScale: image.paintedWidth / pagePointSize.width
PdfPageImage {
id: image
document: root.document
currentFrame: index
asynchronous: true
fillMode: Image.PreserveAspectFit
width: paper.pagePointSize.width * root.renderScale
height: paper.pagePointSize.height * root.renderScale
property real renderScale: root.renderScale
property real oldRenderScale: 1
onRenderScaleChanged: {
image.sourceSize.width = paper.pagePointSize.width * renderScale * Screen.devicePixelRatio
image.sourceSize.height = 0
paper.scale = 1
searchHighlights.update()
}
onStatusChanged: {
if (index === pageNavigator.currentPage)
root.currentPageRenderingStatus = status
}
}
Shape {
anchors.fill: parent
visible: image.status === Image.Ready
onVisibleChanged: searchHighlights.update()
ShapePath {
strokeWidth: -1
fillColor: style.pageSearchResultsColor
scale: Qt.size(paper.pageScale, paper.pageScale)
PathMultiline {
id: searchHighlights
function update() {
// paths could be a binding, but we need to be able to "kick" it sometimes
paths = searchModel.boundingPolygonsOnPage(index)
}
}
}
Connections {
target: searchModel
// whenever the highlights on the _current_ page change, they actually need to change on _all_ pages
// (usually because the search string has changed)
function onCurrentPageBoundingPolygonsChanged() { searchHighlights.update() }
}
ShapePath {
strokeWidth: -1
fillColor: style.selectionColor
scale: Qt.size(paper.pageScale, paper.pageScale)
PathMultiline {
paths: selection.geometry
}
}
}
Shape {
anchors.fill: parent
visible: image.status === Image.Ready && searchModel.currentPage === index
ShapePath {
strokeWidth: style.currentSearchResultStrokeWidth
strokeColor: style.currentSearchResultStrokeColor
fillColor: "transparent"
scale: Qt.size(paper.pageScale, paper.pageScale)
PathMultiline {
paths: searchModel.currentResultBoundingPolygons
}
}
}
PinchHandler {
id: pinch
minimumScale: 0.1
maximumScale: root.renderScale < 4 ? 2 : 1
minimumRotation: root.pageRotation
maximumRotation: root.pageRotation
enabled: image.sourceSize.width < 5000
onActiveChanged:
if (active) {
paper.z = 10
} else {
paper.z = 0
const centroidInPoints = Qt.point(pinch.centroid.position.x / root.renderScale,
pinch.centroid.position.y / root.renderScale)
const centroidInFlickable = tableView.mapFromItem(paper, pinch.centroid.position.x, pinch.centroid.position.y)
const newSourceWidth = image.sourceSize.width * paper.scale
const ratio = newSourceWidth / image.sourceSize.width
console.log(lcMPV, "pinch ended on page", index, "with centroid", pinch.centroid.position, centroidInPoints, "wrt flickable", centroidInFlickable,
"page at", pageHolder.x.toFixed(2), pageHolder.y.toFixed(2),
"contentX/Y were", tableView.contentX.toFixed(2), tableView.contentY.toFixed(2))
if (ratio > 1.1 || ratio < 0.9) {
const centroidOnPage = Qt.point(centroidInPoints.x * root.renderScale * ratio, centroidInPoints.y * root.renderScale * ratio)
paper.scale = 1
paper.x = 0
paper.y = 0
root.renderScale *= ratio
tableView.forceLayout()
if (tableView.rotationNorm == 0) {
tableView.contentX = pageHolder.x + tableView.originX + centroidOnPage.x - centroidInFlickable.x
tableView.contentY = pageHolder.y + tableView.originY + centroidOnPage.y - centroidInFlickable.y
} else if (tableView.rotationNorm == 90) {
tableView.contentX = pageHolder.x + tableView.originX + image.height - centroidOnPage.y - centroidInFlickable.x
tableView.contentY = pageHolder.y + tableView.originY + centroidOnPage.x - centroidInFlickable.y
} else if (tableView.rotationNorm == 180) {
tableView.contentX = pageHolder.x + tableView.originX + image.width - centroidOnPage.x - centroidInFlickable.x
tableView.contentY = pageHolder.y + tableView.originY + image.height - centroidOnPage.y - centroidInFlickable.y
} else if (tableView.rotationNorm == 270) {
tableView.contentX = pageHolder.x + tableView.originX + centroidOnPage.y - centroidInFlickable.x
tableView.contentY = pageHolder.y + tableView.originY + image.width - centroidOnPage.x - centroidInFlickable.y
}
console.log(lcMPV, "contentX/Y adjusted to", tableView.contentX.toFixed(2), tableView.contentY.toFixed(2), "y @top", pageHolder.y)
tableView.returnToBounds()
}
}
grabPermissions: PointerHandler.CanTakeOverFromAnything
}
DragHandler {
id: textSelectionDrag
acceptedDevices: PointerDevice.Mouse | PointerDevice.Stylus
target: null
}
TapHandler {
id: mouseClickHandler
acceptedDevices: PointerDevice.Mouse | PointerDevice.Stylus
}
TapHandler {
id: touchTapHandler
acceptedDevices: PointerDevice.TouchScreen
onTapped: {
selection.clear()
selection.forceActiveFocus()
}
}
Repeater {
model: PdfLinkModel {
id: linkModel
document: root.document
page: image.currentFrame
}
delegate: PdfLinkDelegate {
x: rectangle.x * paper.pageScale
y: rectangle.y * paper.pageScale
width: rectangle.width * paper.pageScale
height: rectangle.height * paper.pageScale
visible: image.status === Image.Ready
onTapped:
(link) => {
if (link.page >= 0)
root.goToLocation(link.page, link.location, link.zoom)
else
Qt.openUrlExternally(url)
}
}
}
PdfSelection {
id: selection
anchors.fill: parent
document: root.document
page: image.currentFrame
renderScale: image.renderScale
from: textSelectionDrag.centroid.pressPosition
to: textSelectionDrag.centroid.position
hold: !textSelectionDrag.active && !mouseClickHandler.pressed
onTextChanged: root.selectedText = text
focus: true
}
}
}
ScrollBar.vertical: ScrollBar {
id: vscroll
property bool moved: false
onPositionChanged: moved = true
onPressedChanged: if (pressed) {
// When the user starts scrolling, push the location where we came from so the user can go "back" there
const cell = tableView.cellAtPos(root.width / 2, root.height / 2)
const currentItem = tableView.itemAtCell(cell)
const currentLocation = currentItem
? Qt.point((tableView.contentX - currentItem.x + tableView.jumpLocationMargin.x) / root.renderScale,
(tableView.contentY - currentItem.y + tableView.jumpLocationMargin.y) / root.renderScale)
: Qt.point(0, 0) // maybe the delegate wasn't loaded yet
pageNavigator.jump(cell.y, currentLocation, root.renderScale)
}
onActiveChanged: if (!active ) {
// When the scrollbar stops moving, tell navstack where we are, so as to update currentPage etc.
const cell = tableView.cellAtPos(root.width / 2, root.height / 2)
const currentItem = tableView.itemAtCell(cell)
const currentLocation = currentItem
? Qt.point((tableView.contentX - currentItem.x + tableView.jumpLocationMargin.x) / root.renderScale,
(tableView.contentY - currentItem.y + tableView.jumpLocationMargin.y) / root.renderScale)
: Qt.point(0, 0) // maybe the delegate wasn't loaded yet
pageNavigator.update(cell.y, currentLocation, root.renderScale)
}
}
ScrollBar.horizontal: ScrollBar { }
}
onRenderScaleChanged: {
// if pageNavigator.jumped changes the scale, don't turn around and update the stack again;
// and don't force layout either, because positionViewAtCell() will do that
if (pageNavigator.jumping)
return
// make TableView rebuild from scratch, because otherwise it doesn't know the delegates are changing size
tableView.rebuild()
const cell = tableView.cellAtPos(root.width / 2, root.height / 2)
const currentItem = tableView.itemAtCell(cell)
if (currentItem) {
const currentLocation = Qt.point((tableView.contentX - currentItem.x + tableView.jumpLocationMargin.x) / root.renderScale,
(tableView.contentY - currentItem.y + tableView.jumpLocationMargin.y) / root.renderScale)
pageNavigator.update(cell.y, currentLocation, renderScale)
}
}
PdfPageNavigator {
id: pageNavigator
property bool jumping: false
property int previousPage: 0
onJumped: function(current) {
jumping = true
if (current.zoom > 0)
root.renderScale = current.zoom
const pageSize = root.document.pagePointSize(current.page)
if (current.location.y < 0) {
// invalid to indicate that a specific location was not needed,
// so attempt to position the new page just as the current page is
const previousPageDelegate = tableView.itemAtCell(0, previousPage)
const currentYOffset = previousPageDelegate
? tableView.contentY - previousPageDelegate.y
: 0
tableView.positionViewAtRow(current.page, Qt.AlignTop, currentYOffset)
console.log(lcMPV, "going from page", previousPage, "to", current.page, "offset", currentYOffset,
"ended up @", tableView.contentX.toFixed(1) + ", " + tableView.contentY.toFixed(1))
} else if (current.rectangles.length > 0) {
// jump to a search result and position the covered area within the viewport
pageSize.width *= root.renderScale
pageSize.height *= root.renderScale
const rectPts = current.rectangles[0]
const rectPx = Qt.rect(rectPts.x * root.renderScale - tableView.jumpLocationMargin.x,
rectPts.y * root.renderScale - tableView.jumpLocationMargin.y,
rectPts.width * root.renderScale + tableView.jumpLocationMargin.x * 2,
rectPts.height * root.renderScale + tableView.jumpLocationMargin.y * 2)
tableView.positionViewAtCell(0, current.page, TableView.Contain, Qt.point(0, 0), rectPx)
console.log(lcMPV, "going to zoom", root.renderScale, "rect", rectPx, "on page", current.page,
"ended up @", tableView.contentX.toFixed(1) + ", " + tableView.contentY.toFixed(1))
} else {
// jump to a page and position the given location relative to the top-left corner of the viewport
pageSize.width *= root.renderScale
pageSize.height *= root.renderScale
const rectPx = Qt.rect(current.location.x * root.renderScale - tableView.jumpLocationMargin.x,
current.location.y * root.renderScale - tableView.jumpLocationMargin.y,
tableView.jumpLocationMargin.x * 2, tableView.jumpLocationMargin.y * 2)
tableView.positionViewAtCell(0, current.page, TableView.AlignLeft | TableView.AlignTop, Qt.point(0, 0), rectPx)
console.log(lcMPV, "going to zoom", root.renderScale, "loc", current.location, "on page", current.page,
"ended up @", tableView.contentX.toFixed(1) + ", " + tableView.contentY.toFixed(1))
}
jumping = false
previousPage = current.page
}
property url documentSource: root.document.source
onDocumentSourceChanged: {
pageNavigator.clear()
root.resetScale()
tableView.contentX = 0
tableView.contentY = 0
}
}
PdfSearchModel {
id: searchModel
document: root.document === undefined ? null : root.document
onCurrentResultChanged: pageNavigator.jump(currentResultLink)
}
}
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