Merge pull request #176 from DevStaKat/master

interactionEndFrictionCoefficient param added
espresso3389 · Jun 18, 2024 · 2515409 · 2515409
2 parents 2a1cb05 + b365748
commit 2515409
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diff --git a/lib/src/widgets/pdf_viewer.dart b/lib/src/widgets/pdf_viewer.dart
@@ -429,6 +429,7 @@ class _PdfViewerState extends State<PdfViewer>
                       onInteractionEnd: widget.params.onInteractionEnd,
                       onInteractionStart: widget.params.onInteractionStart,
                       onInteractionUpdate: widget.params.onInteractionUpdate,
+                      interactionEndFrictionCoefficient: widget.params.interactionEndFrictionCoefficient,
                       onWheelDelta: widget.params.scrollByMouseWheel != null
                           ? _onWheelDelta
                           : null,

diff --git a/lib/src/widgets/pdf_viewer_params.dart b/lib/src/widgets/pdf_viewer_params.dart
@@ -38,6 +38,7 @@ class PdfViewerParams {
     this.onInteractionEnd,
     this.onInteractionStart,
     this.onInteractionUpdate,
+    this.interactionEndFrictionCoefficient = _kDrag,
     this.onDocumentChanged,
     this.calculateInitialPageNumber,
     this.calculateCurrentPageNumber,
@@ -190,6 +191,13 @@ class PdfViewerParams {
   /// See [InteractiveViewer.onInteractionUpdate] for details.
   final GestureScaleUpdateCallback? onInteractionUpdate;
 
+  /// See [InteractiveViewer.interactionEndFrictionCoefficient] for details.
+  final double interactionEndFrictionCoefficient;
+
+  // Used as the coefficient of friction in the inertial translation animation.
+  // This value was eyeballed to give a feel similar to Google Photos.
+  static const double _kDrag = 0.0000135;
+
   /// Function to notify that the document is loaded/changed.
   ///
   /// The function is called even if the document is null (it means the document is unloaded).
@@ -401,6 +409,8 @@ class PdfViewerParams {
         other.pageDropShadow != pageDropShadow ||
         other.panEnabled != panEnabled ||
         other.scaleEnabled != scaleEnabled ||
+        other.interactionEndFrictionCoefficient !=
+            interactionEndFrictionCoefficient ||
         other.scrollByMouseWheel != scrollByMouseWheel ||
         other.enableKeyboardNavigation != enableKeyboardNavigation ||
         other.scrollByArrowKey != scrollByArrowKey ||
@@ -434,6 +444,8 @@ class PdfViewerParams {
         other.onInteractionEnd == onInteractionEnd &&
         other.onInteractionStart == onInteractionStart &&
         other.onInteractionUpdate == onInteractionUpdate &&
+        other.interactionEndFrictionCoefficient ==
+            interactionEndFrictionCoefficient &&
         other.onDocumentChanged == onDocumentChanged &&
         other.calculateInitialPageNumber == calculateInitialPageNumber &&
         other.calculateCurrentPageNumber == calculateCurrentPageNumber &&
@@ -479,6 +491,7 @@ class PdfViewerParams {
         onInteractionEnd.hashCode ^
         onInteractionStart.hashCode ^
         onInteractionUpdate.hashCode ^
+        interactionEndFrictionCoefficient.hashCode ^
         onDocumentChanged.hashCode ^
         calculateInitialPageNumber.hashCode ^
         calculateCurrentPageNumber.hashCode ^