1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
|
// Copyright (C) 2022 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
import QtQuick
import QtQuick.Controls
import QtQuick.Pdf
import QtQuick.Shapes
/*!
\qmltype PdfScrollablePageView
\inqmlmodule QtQuick.Pdf
\brief A complete PDF viewer component to show one page a time, with scrolling.
PdfScrollablePageView provides a PDF viewer component that shows one page
at a time, with scrollbars to move around the page. It 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 pdfviewer 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, PdfMultiPageView, PdfStyle
*/
Flickable {
/*!
\qmlproperty PdfDocument PdfScrollablePageView::document
A PdfDocument object with a valid \c source URL is required:
\snippet multipageview.qml 0
*/
required property PdfDocument document
/*!
\qmlproperty int PdfScrollablePageView::status
This property holds the \l {QtQuick::Image::status}{rendering status} of
the \l {currentPage}{current page}.
\sa PdfPageImage::status
*/
property alias status: image.status
/*!
\qmlproperty PdfDocument PdfScrollablePageView::selectedText
The selected text.
*/
property alias selectedText: selection.text
/*!
\qmlmethod void PdfScrollablePageView::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() {
selection.selectAll()
}
/*!
\qmlmethod void PdfScrollablePageView::copySelectionToClipboard()
Copies the selected text (if any) to the
\l {QClipboard::Clipboard}{system clipboard}.
\sa selectAll()
*/
function copySelectionToClipboard() {
selection.copyToClipboard()
}
// --------------------------------
// page navigation
/*!
\qmlproperty int PdfScrollablePageView::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 PdfScrollablePageView::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 PdfScrollablePageView::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 PdfScrollablePageView::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 PdfScrollablePageView::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 PdfScrollablePageView::goToPage(int page)
Changes the view to the \a page, if possible.
\sa PdfPageNavigator::jump(), currentPage
*/
function goToPage(page) {
if (page === pageNavigator.currentPage)
return
goToLocation(page, Qt.point(0, 0), 0)
}
/*!
\qmlmethod void PdfScrollablePageView::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)
root.renderScale = zoom
pageNavigator.jump(page, location, zoom)
}
// --------------------------------
// page scaling
/*!
\qmlproperty real PdfScrollablePageView::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 PdfScrollablePageView::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
/*!
\qmlproperty size PdfScrollablePageView::sourceSize
This property holds the scaled width and height of the full-frame image.
\sa PdfPageImage::sourceSize
*/
property alias sourceSize: image.sourceSize
/*!
\qmlmethod void PdfScrollablePageView::resetScale()
Sets \l renderScale back to its default value of \c 1.
*/
function resetScale() {
paper.scale = 1
root.renderScale = 1
}
/*!
\qmlmethod void PdfScrollablePageView::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) {
const pagePointSize = document.pagePointSize(pageNavigator.currentPage)
root.renderScale = root.width / (paper.rot90 ? pagePointSize.height : pagePointSize.width)
console.log(lcSPV, "scaling", pagePointSize, "to fit", root.width, "rotated?", paper.rot90, "scale", root.renderScale)
root.contentX = 0
root.contentY = 0
}
/*!
\qmlmethod void PdfScrollablePageView::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 pagePointSize = document.pagePointSize(pageNavigator.currentPage)
root.renderScale = Math.min(
root.width / (paper.rot90 ? pagePointSize.height : pagePointSize.width),
root.height / (paper.rot90 ? pagePointSize.width : pagePointSize.height) )
root.contentX = 0
root.contentY = 0
}
// --------------------------------
// text search
/*!
\qmlproperty PdfSearchModel PdfScrollablePageView::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 PdfScrollablePageView::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 PdfScrollablePageView::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 PdfScrollablePageView::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 }
// --------------------------------
// implementation
id: root
PdfStyle { id: style }
contentWidth: paper.width
contentHeight: paper.height
ScrollBar.vertical: ScrollBar {
onActiveChanged:
if (!active ) {
const currentLocation = Qt.point((root.contentX + root.width / 2) / root.renderScale,
(root.contentY + root.height / 2) / root.renderScale)
pageNavigator.update(pageNavigator.currentPage, currentLocation, root.renderScale)
}
}
ScrollBar.horizontal: ScrollBar {
onActiveChanged:
if (!active ) {
const currentLocation = Qt.point((root.contentX + root.width / 2) / root.renderScale,
(root.contentY + root.height / 2) / root.renderScale)
pageNavigator.update(pageNavigator.currentPage, currentLocation, root.renderScale)
}
}
onRenderScaleChanged: {
image.sourceSize.width = document.pagePointSize(pageNavigator.currentPage).width *
renderScale * Screen.devicePixelRatio
image.sourceSize.height = 0
paper.scale = 1
const currentLocation = Qt.point((root.contentX + root.width / 2) / root.renderScale,
(root.contentY + root.height / 2) / root.renderScale)
pageNavigator.update(pageNavigator.currentPage, currentLocation, root.renderScale)
}
PdfSearchModel {
id: searchModel
document: root.document === undefined ? null : root.document
onCurrentResultChanged: pageNavigator.jump(currentResultLink)
}
PdfPageNavigator {
id: pageNavigator
onJumped: function(current) {
root.renderScale = current.zoom
const dx = Math.max(0, current.location.x * root.renderScale - root.width / 2) - root.contentX
const dy = Math.max(0, current.location.y * root.renderScale - root.height / 2) - root.contentY
// don't jump if location is in the viewport already, i.e. if the "error" between desired and actual contentX/Y is small
if (Math.abs(dx) > root.width / 3)
root.contentX += dx
if (Math.abs(dy) > root.height / 3)
root.contentY += dy
console.log(lcSPV, "going to zoom", current.zoom, "loc", current.location,
"on page", current.page, "ended up @", root.contentX + ", " + root.contentY)
}
onCurrentPageChanged: searchModel.currentPage = currentPage
property url documentSource: root.document.source
onDocumentSourceChanged: {
pageNavigator.clear()
root.resetScale()
root.contentX = 0
root.contentY = 0
}
}
LoggingCategory {
id: lcSPV
name: "qt.pdf.singlepageview"
}
Rectangle {
id: paper
width: rot90 ? image.height : image.width
height: rot90 ? image.width : image.height
property real rotationModulus: Math.abs(root.pageRotation % 180)
property bool rot90: rotationModulus > 45 && rotationModulus < 135
PdfPageImage {
id: image
document: root.document
currentFrame: pageNavigator.currentPage
asynchronous: true
fillMode: Image.PreserveAspectFit
rotation: root.pageRotation
anchors.centerIn: parent
property real pageScale: image.paintedWidth / document.pagePointSize(pageNavigator.currentPage).width
Shape {
anchors.fill: parent
visible: image.status === Image.Ready
ShapePath {
strokeWidth: -1
fillColor: style.pageSearchResultsColor
scale: Qt.size(image.pageScale, image.pageScale)
PathMultiline {
paths: searchModel.currentPageBoundingPolygons
}
}
ShapePath {
strokeWidth: style.currentSearchResultStrokeWidth
strokeColor: style.currentSearchResultStrokeColor
fillColor: "transparent"
scale: Qt.size(image.pageScale, image.pageScale)
PathMultiline {
paths: searchModel.currentResultBoundingPolygons
}
}
ShapePath {
fillColor: style.selectionColor
scale: Qt.size(image.pageScale, image.pageScale)
PathMultiline {
paths: selection.geometry
}
}
}
Repeater {
model: PdfLinkModel {
id: linkModel
document: root.document
page: pageNavigator.currentPage
}
delegate: PdfLinkDelegate {
x: rectangle.x * image.pageScale
y: rectangle.y * image.pageScale
width: rectangle.width * image.pageScale
height: rectangle.height * image.pageScale
visible: image.status === Image.Ready
onTapped:
(link) => {
if (link.page >= 0)
pageNavigator.jump(link.page, link.location, link.zoom)
else
Qt.openUrlExternally(url)
}
}
}
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.focus = true
}
}
}
PdfSelection {
id: selection
anchors.fill: parent
document: root.document
page: pageNavigator.currentPage
renderScale: image.pageScale == 0 ? 1.0 : image.pageScale
from: textSelectionDrag.centroid.pressPosition
to: textSelectionDrag.centroid.position
hold: !textSelectionDrag.active && !mouseClickHandler.pressed
focus: true
}
PinchHandler {
id: pinch
minimumScale: 0.1
maximumScale: root.renderScale < 4 ? 2 : 1
minimumRotation: 0
maximumRotation: 0
enabled: image.sourceSize.width < 5000
onActiveChanged:
if (!active) {
const centroidInPoints = Qt.point(pinch.centroid.position.x / root.renderScale,
pinch.centroid.position.y / root.renderScale)
const centroidInFlickable = root.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(lcSPV, "pinch ended with centroid", pinch.centroid.position, centroidInPoints, "wrt flickable", centroidInFlickable,
"page at", paper.x.toFixed(2), paper.y.toFixed(2),
"contentX/Y were", root.contentX.toFixed(2), root.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.contentX = centroidOnPage.x - centroidInFlickable.x
root.contentY = centroidOnPage.y - centroidInFlickable.y
root.renderScale *= ratio // onRenderScaleChanged calls pageNavigator.update() so we don't need to here
console.log(lcSPV, "contentX/Y adjusted to", root.contentX.toFixed(2), root.contentY.toFixed(2))
} else {
paper.x = 0
paper.y = 0
}
}
grabPermissions: PointerHandler.CanTakeOverFromAnything
}
}
}
|