kmpdfkit_demo/lib/widgets/events.dart

import 'package:flutter/services.dart';
import 'package:kmpdfkit_demo/widgets/contains.dart';
import 'package:kmpdfkit_demo/widgets/models/annot_bean.dart';

import 'models/annot_attribute_bean.dart';

const _methodChannel = MethodChannel(ChannelNames.eventCPDFReaderView);
const _modifyAnnotAttrChannel =
    MethodChannel(ChannelNames.eventModifyAnnotationAttr);

//Listen to PDFReaderView events.
const _readerViewCallBackEventChannel =
    EventChannel(ChannelNames.eventReaderViewCallback);

const _contextMenuHelperEventChannel =
    EventChannel(ChannelNames.eventReaderViewContextMenuHelper);

const _focusedChangeEventChannel =
    EventChannel(ChannelNames.eventFocusedChange);

typedef CancelListener = void Function();

enum eventSinkId {
  readerViewCallBack,
  readerViewContextMenuHelper,
  readerViewFocusedChange
}

/// Listen to PDFReaderView events<br>
/// onTapMainDocArea : Click CPDFReaderView display area callback
/// onMoveToChild : The pdf document is moved to the specified page, and the page number is returned by 'pageIndex'
/// onRecordLastJumpNum : Returns the page number of the last record and returns the page number via the 'pageIndex' parameter
/// onScrolling : CPDFReaderView page sliding monitoring
/// onScrollEnd : CPDFReaderView page sliding end monitoring
///
///Please use in addOnPlatformViewCreatedListener
///```dart
///              ..addOnPlatformViewCreatedListener((id) {
///                 setReaderViewCallbackListener(
///                     onTapMainDocArea: () {
///                       print("onTapMainDocArea");
///                     },
///                     onMoveToChild: (pageIndex) {},
///                     onScrolling: () {},
///                     onScrollEnd: () {},
///                     onRecordLastJumpPageNum: (pageIndex) {});
///               })
///```
///
CancelListener setReaderViewCallbackListener(
    {VoidCallback? onTapMainDocArea,
    Function(int pageIndex)? onMoveToChild,
    VoidCallback? onScrolling,
    VoidCallback? onScrollEnd,
    Function(int pageIndex)? onRecordLastJumpPageNum}) {
  var subscription = _readerViewCallBackEventChannel
      .receiveBroadcastStream(eventSinkId.readerViewCallBack.index)
      .listen((data) {
    Map<dynamic, dynamic> result = data;
    String eventType = result[EventParameters.eventType];
    switch (eventType) {
      case EventParameters.onTapMainDocArea:
        if (onTapMainDocArea != null) {
          onTapMainDocArea();
        }
        break;
      case EventParameters.onMoveToChild:
        if (onMoveToChild != null) {
          int pageIndex = result[EventParameters.pageIndex];
          onMoveToChild(pageIndex);
        }
        break;
      case EventParameters.onRecordLastJumpPageNum:
        if (onRecordLastJumpPageNum != null) {
          int pageIndex = result[EventParameters.pageIndex];
          onRecordLastJumpPageNum(pageIndex);
        }

        break;
      case EventParameters.onScrollEnd:
        if (onScrollEnd != null) {
          onScrollEnd();
        }
        break;
      case EventParameters.onScrolling:
        if (onScrolling != null) {
          onScrolling();
        }
        break;
      default:
        break;
    }
  }, cancelOnError: true);
  return () {
    subscription.cancel();
  };
}

/// Set up an event channel for "cpdfreaderview" to trigger an event when the user clicks on the "Properties" menu item.
/// When the event is triggered, the native side will return the selected annotation type and related properties.
/// The Flutter side will display an annotation property adjustment interface
/// based on the returned annotation type and properties, allowing users to modify the annotation properties.
/// After modifying the annotation properties, the Flutter side will
/// send the modified property values back to the native side to update
/// the annotation in the PDF file.
/// ```dart
///     setReaderViewContextMenuHelperListener((annotBean) {
///       //show annotation attribute options widget
///       _showAttributeOptionsModalBottomSheet(context, annotBean,(AnnotAttributeBean bean) {
///         modifyAnnotationAttribute(
///             annotationType: annotBean.annotType, bean: bean);
///       }, (){
///         dismissModifyAnnotationAttribute();
///       });
///     });
///
/// ```
void setReaderViewContextMenuHelperListener(
    Function(AnnotBean) showAnnotationAttributeOptions) {
  _contextMenuHelperEventChannel.receiveBroadcastStream({
    EventParameters.eventType: eventSinkId.readerViewContextMenuHelper.name
  }).listen((event) {
    Map<dynamic, dynamic> result = event;
    String annotType = result[EventParameters.annotType];
    AnnotationType type = AnnotationType.values.byName(annotType);
    showAnnotationAttributeOptions(AnnotBean(
      annotType: type,
      attributeBean: AnnotAttributeBean.parseMapValue(type, result),
    ));
  }, cancelOnError: true);
}

///Converts the focused type from a string to an AnnotationType enum value.
void setReaderViewFocusedChangeListener(Function(AnnotationType) callback) {
  _focusedChangeEventChannel
      .receiveBroadcastStream(eventSinkId.readerViewFocusedChange.name)
      .listen((event) {
    String focusedType = event;
    //Converts the focused type from a string to an AnnotationType enum value.
    AnnotationType type = AnnotationType.values.byName(focusedType.toLowerCase());
    // If the focused type is a shape type, treat it as a general shape type.
    if(type.isShapeType){
      type = AnnotationType.shape;
    }
    // Calls the callback function with the determined AnnotationType value.
    callback(type);
  }, cancelOnError: true);
}

///This method is used to select annotations on the page and adjust their properties.
/// Before using this method, please make sure that an annotation object has been selected.
/// To use this method, you need to first call the "setReaderViewContextMenuHelperListener" method to set up the context menu.
/// ```dart
///     setReaderViewContextMenuHelperListener((annotBean) {
///       //show annotation attribute options widget
///       _showAttributeOptionsModalBottomSheet(context, annotBean,(AnnotAttributeBean bean) {
///         //modify annotation attribute
///         modifyAnnotationAttribute(
///             annotationType: annotBean.annotType, bean: bean);
///       }, (){
///         dismissModifyAnnotationAttribute();
///       });
///     });
///
/// ```
void modifyAnnotationAttribute(
    {required AnnotationType annotationType,
    required AnnotAttributeBean bean}) async {
  await _modifyAnnotAttrChannel.invokeMethod(
      Functions.modifyAnnotAttribute, bean.toMapValues(annotationType));
}

/// Please call this method after the annotation attribute adjustment interface is closed.
void dismissModifyAnnotationAttribute() async {
  await _modifyAnnotAttrChannel
      .invokeMethod(Functions.dismissModifyAnnotationAttr);
}

///get current CPDFReaderView scroll direction
///true : [ScrollDirection.vertical]
///false : [ScrollDirection.horizontal]
///```dart
/// bool isVertical = await scrollDirectionIsVerticalMode();
/// ```
Future<bool> scrollDirectionIsVerticalMode() async {
  String scrollDirection =
      await _methodChannel.invokeMethod(Functions.getScrollDirection);
  return scrollDirection == ScrollDirection.vertical;
}

/// set CPDFReaderView scroll direction
///```dart
///bool isVertical = await setScrollDirection(direction);
///
///```
/// Returns the current scroll direction
/// true : [ScrollDirection.vertical]
/// false : [ScrollDirection.horizontal]
///
Future<bool> setScrollDirection(String direction) async {
  String scrollDirection = await _methodChannel.invokeMethod(
      Functions.setScrollDirection,
      {EventParameters.scrollDirection: direction});
  return scrollDirection == ScrollDirection.vertical;
}

///Get the current CPDFReaderView page mode
///```dart
/// bool doublePage = await isDoublePage();
///
///```
Future<bool> isDoublePage() async {
  return await _methodChannel.invokeMethod(Functions.getPageMode);
}

///set page mode
///true: double page
///false: single page
///```dart
/// bool isDoublePage = await setPageMode(doublePage);
///
///```
Future<bool> setPageMode(bool doublePage) async {
  return await _methodChannel.invokeMethod(
      Functions.setPageMode, {EventParameters.isDoublePage: doublePage});
}

///Get whether 'CPDFReaderView' is in continuous scrolling mode
///```dart
///     bool isContinue = await isContinueMode();
/// ```
Future<bool> isContinueMode() async {
  return await _methodChannel.invokeMethod(Functions.getPageContinue);
}

///Set page scrolling mode
///true: continue Mode
///```dart
///     bool isContinueMode = await setIsContinueMode(isContinueMode);
/// ```
Future<bool> setIsContinueMode(bool isContinueMode) async {
  return await _methodChannel.invokeMethod(Functions.setPageContinue,
      {EventParameters.isContinueMode: isContinueMode});
}

///Get whether 'ComPDFReaderView' is in cover display mode
///```dart
///     bool isCoverPageMode = await isCoverPageMode();
/// ```
Future<bool> isCoverPageMode() async {
  return await _methodChannel.invokeMethod(Functions.isCoverPageMode);
}

///set is cover display mode
///true: is cover page mode
///```dart
///     bool isCoverPageMode = await setIsCoverPageMode(isCoverPageMode);
/// ```
Future<bool> setIsCoverPageMode(bool isCoverPageMode) async {
  return await _methodChannel.invokeMethod(Functions.setCoverPageMode,
      {EventParameters.isCoverPageMode: isCoverPageMode});
}

///Get 'ComPDFReaderView' whether to crop the display mode
///```dart
///     bool isCropMode = await isCropPageMode();
/// ```
Future<bool> isCropPageMode() async {
  return await _methodChannel.invokeMethod(Functions.isCropPageMode);
}

///set is crop display mode
///true: is crop page mode
///```dart
///     bool isCropMode = await setIsCropPageMode(isCropPageMode);
/// ```
Future<bool> setIsCropPageMode(bool isCropPageMode) async {
  return await _methodChannel.invokeMethod(Functions.setIsCropPageMode,
      {EventParameters.isCropPageMode: isCropPageMode});
}

/// get reader view background color
///```dart
///   int color = await getReadBackgroundColor();
///```
/// return current reader view background color
Future<int> getReadBackgroundColor() async {
  return await _methodChannel.invokeMethod(Functions.getReadBackgroundColor);
}

/// set reader view background color
/// Changing the appearance mode will change the PDF rendering style, but it does not modify the PDF on disk. To set the color mode:
/// normal color mode : #FFFFFF
/// Dark mode : #000000
/// Sepia mode : #FFEFBE
/// Reseda mode : #CDE6D0
/// Custom color mode : any hexadecimal value
///```dart
///   int color = await setReadBackgroundColor(backgroundColor);
///
///```
///return current reader view background color
Future<int> setReadBackgroundColor(int backgroundColor) async {
  return await _methodChannel.invokeMethod(Functions.setReadBackgroundColor,
      {EventParameters.readBackgroundColor: backgroundColor});
}

/// Get annotation attributes based on annotation type
///
/// ```dart
///     AnnotAttributeBean highlight = await getAnnotAttribute(AnnotType.highlight);
/// ```
/// return annotation attributes color and alpha
Future<AnnotAttributeBean> getAnnotAttribute(AnnotationType annotType) async {
  Map<dynamic, dynamic> annotAttrMap = await _methodChannel.invokeMethod(
      Functions.getAnnotAttribute, {EventParameters.annotType: annotType.name});
  return AnnotAttributeBean.parseMapValue(annotType, annotAttrMap)
    ..showShapeTypeWidget = true;
}

///set annotation attributes
///```dart
/// AnnotAttributeBean attr = await setAnnotAttribute(
///                   annotType: annotBean.annotType, color: color, alpha: alpha);
///```
/// return annotation attributes color and alpha
void setAnnotAttribute(
    {required AnnotationType annotationType,
    required AnnotAttributeBean bean}) async {
  await _methodChannel.invokeMethod(Functions.setAnnotAttribute, {
    EventParameters.annotType: annotationType.name,
    EventParameters.annotAttribute: bean.toMapValues(annotationType)
  });
}

/// set CPDFReaderView current focused type
/// This setting will change the type of action you swipe on CPDFReaderView
/// If you need to set it as a browsing state, please set
/// focusedType :[AnnotationType.unknown]
/// touchMode : [TouchMode.browse]
///
/// If you need to set to add Annotation state, please set
/// focusedType : [AnnotationType]
/// touchMode : [TouchMode.add_annot]
///```dart
///   setCPDFReaderViewFocusType(annotationType)
///```
///
void setCPDFReaderViewFocusType(AnnotationType annotationType) async {
  await _methodChannel.invokeMethod(Functions.setCurrentFocusedType, {
    EventParameters.touchMode: annotationType == AnnotationType.unknown
        ? TouchMode.browse.name
        : TouchMode.add_annot.name,
    EventParameters.focusedType: annotationType.name
  });
}


/// get pdf document file page total count
Future<int> getDocumentPageCount() async{
  Map<dynamic, dynamic> map = await _methodChannel.invokeMethod(Functions.getDocumentPageInfo);
  return map[EventParameters.documentPageCount];
}