io.flutter.embedding.engine.mutatorsstack.FlutterMutatorView Class Reference

Inheritance diagram for io.flutter.embedding.engine.mutatorsstack.FlutterMutatorView:

Public Member Functions
	FlutterMutatorView ( @NonNull Context context, float screenDensity, @Nullable AndroidTouchProcessor androidTouchProcessor)
	FlutterMutatorView (@NonNull Context context)
void	setOnDescendantFocusChangeListener (@NonNull OnFocusChangeListener userFocusListener)
void	unsetOnDescendantFocusChangeListener ()
void	readyToDisplay ( @NonNull FlutterMutatorsStack mutatorsStack, int left, int top, int width, int height)
void	draw (Canvas canvas)
void	dispatchDraw (Canvas canvas)
boolean	onInterceptTouchEvent (MotionEvent event)
boolean	requestSendAccessibilityEvent (View child, AccessibilityEvent event)
boolean	onTouchEvent (MotionEvent event)

Package Attributes
ViewTreeObserver.OnGlobalFocusChangeListener	activeFocusListener

Detailed Description

A view that applies the io.flutter.embedding.engine.mutatorsstack.FlutterMutatorsStack to its children.

Definition at line 25 of file FlutterMutatorView.java.

Constructor & Destructor Documentation

FlutterMutatorView() [1/2]

io.flutter.embedding.engine.mutatorsstack.FlutterMutatorView.FlutterMutatorView ( @NonNull Context  context, float  screenDensity, @Nullable AndroidTouchProcessor  androidTouchProcessor  )

inline

Initialize the FlutterMutatorView. Use this to set the screenDensity, which will be used to correct the final transform matrix.

Definition at line 39 of file FlutterMutatorView.java.

                                                             {
    super(context, null);
    this.screenDensity = screenDensity;
    this.androidTouchProcessor = androidTouchProcessor;
  }

FlutterMutatorView() [2/2]

io.flutter.embedding.engine.mutatorsstack.FlutterMutatorView.FlutterMutatorView ( @NonNull Context  context )

inline

Initialize the FlutterMutatorView.

Definition at line 49 of file FlutterMutatorView.java.

                                                      {
    this(context, 1, /* androidTouchProcessor=*/ null);
  }

Member Function Documentation

dispatchDraw()

void io.flutter.embedding.engine.mutatorsstack.FlutterMutatorView.dispatchDraw ( Canvas  canvas )

inline

Definition at line 126 of file FlutterMutatorView.java.

                                          {
    // Apply all the transforms on the child canvas.
    canvas.save();
 
    canvas.concat(getPlatformViewMatrix());
    super.dispatchDraw(canvas);
    canvas.restore();
  }

draw()

void io.flutter.embedding.engine.mutatorsstack.FlutterMutatorView.draw ( Canvas  canvas )

inline

Definition at line 107 of file FlutterMutatorView.java.

                                  {
    // Apply all clippings on the parent canvas.
    canvas.save();
    for (Path path : mutatorsStack.getFinalClippingPaths()) {
      // Reverse the current offset.
      //
      // The frame of this view includes the final offset of the bounding rect.
      // We need to apply all the mutators to the view, which includes the mutation that leads to
      // the final offset. We should reverse this final offset, both as a translate mutation and to
      // all the clipping paths
      Path pathCopy = new Path(path);
      pathCopy.offset(-left, -top);
      canvas.clipPath(pathCopy);
    }
    super.draw(canvas);
    canvas.restore();
  }

onInterceptTouchEvent()

boolean io.flutter.embedding.engine.mutatorsstack.FlutterMutatorView.onInterceptTouchEvent ( MotionEvent  event )

inline

Intercept the events here and do not propagate them to the child platform views.

Definition at line 160 of file FlutterMutatorView.java.

                                                          {
    return true;
  }

onTouchEvent()

boolean io.flutter.embedding.engine.mutatorsstack.FlutterMutatorView.onTouchEvent ( MotionEvent  event )

inline

Definition at line 181 of file FlutterMutatorView.java.

                                                 {
    if (androidTouchProcessor == null) {
      return super.onTouchEvent(event);
    }
 
    final Matrix screenMatrix = new Matrix();
 
    switch (event.getAction()) {
      case MotionEvent.ACTION_DOWN:
        prevLeft = left;
        prevTop = top;
        screenMatrix.postTranslate(left, top);
        break;
      case MotionEvent.ACTION_MOVE:
        // While the view is dragged, use the left and top positions as
        // they were at the moment the touch event fired.
        screenMatrix.postTranslate(prevLeft, prevTop);
        prevLeft = left;
        prevTop = top;
        break;
      case MotionEvent.ACTION_UP:
      default:
        screenMatrix.postTranslate(left, top);
        break;
    }
    return androidTouchProcessor.onTouchEvent(event, screenMatrix);
  }

readyToDisplay()

void io.flutter.embedding.engine.mutatorsstack.FlutterMutatorView.readyToDisplay ( @NonNull FlutterMutatorsStack  mutatorsStack, int  left, int  top, int  width, int  height  )

inline

Pass the necessary parameters to the view so it can apply correct mutations to its children.

Definition at line 94 of file FlutterMutatorView.java.

                                                                                             {
    this.mutatorsStack = mutatorsStack;
    this.left = left;
    this.top = top;
    FrameLayout.LayoutParams layoutParams = new FrameLayout.LayoutParams(width, height);
    layoutParams.leftMargin = left;
    layoutParams.topMargin = top;
    setLayoutParams(layoutParams);
    setWillNotDraw(false);
  }

requestSendAccessibilityEvent()

boolean io.flutter.embedding.engine.mutatorsstack.FlutterMutatorView.requestSendAccessibilityEvent ( View  child, AccessibilityEvent  event  )

inline

Definition at line 165 of file FlutterMutatorView.java.

                                                                                     {
    final View embeddedView = getChildAt(0);
    if (embeddedView != null
        && embeddedView.getImportantForAccessibility()
            == View.IMPORTANT_FOR_ACCESSIBILITY_NO_HIDE_DESCENDANTS) {
      return false;
    }
    // Forward the request only if the embedded view is in the Flutter accessibility tree.
    // The embedded view may be ignored when the framework doesn't populate a SemanticNode
    // for the current platform view.
    // See AccessibilityBridge for more.
    return super.requestSendAccessibilityEvent(child, event);
  }

setOnDescendantFocusChangeListener()

void io.flutter.embedding.engine.mutatorsstack.FlutterMutatorView.setOnDescendantFocusChangeListener ( @NonNull OnFocusChangeListener  userFocusListener )

inline

Sets a focus change listener that notifies when the current view or any of its descendant views have received focus.

If there's an active focus listener, it will first remove the current listener, and then add the new one.

Parameters

userFocusListener

A user provided focus listener.

Definition at line 64 of file FlutterMutatorView.java.

                                                                                                   {
    unsetOnDescendantFocusChangeListener();
 
    final View mutatorView = this;
    final ViewTreeObserver observer = getViewTreeObserver();
    if (observer.isAlive() && activeFocusListener == null) {
      activeFocusListener =
          new ViewTreeObserver.OnGlobalFocusChangeListener() {
            @Override
            public void onGlobalFocusChanged(View oldFocus, View newFocus) {
              userFocusListener.onFocusChange(mutatorView, ViewUtils.childHasFocus(mutatorView));
            }
          };
      observer.addOnGlobalFocusChangeListener(activeFocusListener);
    }
  }

unsetOnDescendantFocusChangeListener()

void io.flutter.embedding.engine.mutatorsstack.FlutterMutatorView.unsetOnDescendantFocusChangeListener ( )

inline

Unsets any active focus listener.

Definition at line 82 of file FlutterMutatorView.java.

                                                     {
    final ViewTreeObserver observer = getViewTreeObserver();
    if (observer.isAlive() && activeFocusListener != null) {
      final ViewTreeObserver.OnGlobalFocusChangeListener currFocusListener = activeFocusListener;
      activeFocusListener = null;
      observer.removeOnGlobalFocusChangeListener(currFocusListener);
    }
  }

Member Data Documentation

activeFocusListener

ViewTreeObserver.OnGlobalFocusChangeListener io.flutter.embedding.engine.mutatorsstack.FlutterMutatorView.activeFocusListener

package

Definition at line 53 of file FlutterMutatorView.java.

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The documentation for this class was generated from the following file:

• shell/platform/android/io/flutter/embedding/engine/mutatorsstack/FlutterMutatorView.java