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Implement document progress feature #537

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Implement document progress feature #537

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2e40a0a
Implement document progress feature
Oct 17, 2024
78c9e2e
fix for zoom
Oct 17, 2024
970b78a
Fix documentProgress zoom projection calculation.
Oct 20, 2024
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3 changes: 3 additions & 0 deletions packages/pdfx/README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -116,6 +116,9 @@ _pdfController.nextPage(duration: Duration(milliseconds: 250), curve: Curves.eas

// Animate to previous page
_pdfController.previousPage(duration: Duration(milliseconds: 250), curve: Curves.easeOut);

// Get document progrees 0.0 - start, 1.0 - end
_pdfController.documentProgress;
```
### Additional pdf info:
```dart
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6 changes: 6 additions & 0 deletions packages/pdfx/lib/src/viewer/pinch/pdf_controller_pinch.dart
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Expand Up @@ -36,6 +36,12 @@ class PdfControllerPinch extends TransformationController
_PdfViewPinchState? _state;
PdfDocument? _document;

// Provide document progress.
// document start documentProgress = 0.0,
// document end documentProgress = 1.0,
double _documentProgress = 0;
double get documentProgress => _documentProgress;

/// Actual page number wrapped with ValueNotifier
@override
late final ValueNotifier<int> pageListenable = ValueNotifier(initialPage);
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11 changes: 11 additions & 0 deletions packages/pdfx/lib/src/viewer/pinch/pdf_view_pinch.dart
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Expand Up @@ -289,6 +289,17 @@ class _PdfViewPinchState extends State<PdfViewPinch>
final r = m.row0[0];
final exposed = Rect.fromLTWH(
-m.row0[3], -m.row1[3], _lastViewSize!.width, _lastViewSize!.height);

if (_lastViewSize?.height != null) {
final rawDocumentProgress =
((exposed.bottom / r - _lastViewSize!.height) /
(_docSize!.height - _lastViewSize!.height));
const precisionFactor = 10000;
_controller._documentProgress =
((rawDocumentProgress * precisionFactor).round() / precisionFactor)
.clamp(0.0, 1.0);
}

var pagesToUpdate = 0;
var changeCount = 0;
_visiblePages.clear();
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