Android Open Source - GestureViews Gesture Layout

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License

The source code is released under:

Apache License

Java Source Code

package com.alexvasilkov.gestures.widgets;
/*from  w  w w. j  ava  2  s  .  c o m*/
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Matrix;
import android.graphics.Rect;
import android.graphics.RectF;
import android.support.v4.view.ViewPager;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.view.ViewParent;
import android.widget.FrameLayout;
import com.alexvasilkov.gestures.GesturesController;
import com.alexvasilkov.gestures.GesturesControllerPagerFix;
import com.alexvasilkov.gestures.State;

/**
 * Gestures controlled layout.
 * <p/>
 * Note: only one children is eligible here.
 */
public class GestureLayout extends FrameLayout implements GesturesController.OnStateChangedListener {

    private final GesturesControllerPagerFix mController;

    private final Matrix mMatrix = new Matrix();
    private final Matrix mMatrixInverse = new Matrix();

    private final RectF mTmpFloatRect = new RectF();
    private final float[] mTmpPointArray = new float[2];

    private MotionEvent mCurrentMotionEvent;

    public GestureLayout(Context context) {
        this(context, null, 0);
    }

    public GestureLayout(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
    }

    public GestureLayout(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);

        mController = new GesturesControllerPagerFix(context, this);
    }

    /**
     * Makes scrolling between different {@link GestureLayout}
     * within given {@link android.support.v4.view.ViewPager} smoother.
     *
     * @see com.alexvasilkov.gestures.GesturesControllerPagerFix#fixViewPagerScroll(android.support.v4.view.ViewPager)
     */
    public void fixViewPagerScroll(ViewPager pager) {
        mController.fixViewPagerScroll(pager);
    }

    /**
     * Makes scrolling between different {@link GestureLayout}
     * within given {@link android.support.v4.view.ViewPager} smoother.
     *
     * @see com.alexvasilkov.gestures.GesturesControllerPagerFix#fixViewPagerScroll(android.support.v4.view.ViewPager, boolean)
     */
    public void fixViewPagerScroll(ViewPager pager, boolean allowSmoothScroll) {
        mController.fixViewPagerScroll(pager, allowSmoothScroll);
    }

    /**
     * Returns {@link com.alexvasilkov.gestures.GesturesController}
     * which is a main engine for {@link GestureImageView}.
     * <p/>
     * Use it to apply settings, modify view state and so on.
     */
    public GesturesController getController() {
        return mController;
    }

    @Override
    public boolean dispatchTouchEvent(MotionEvent event) {
        mCurrentMotionEvent = event;
        // We should remap given event back to original coordinates so children can correctly respond to it
        MotionEvent invertedEvent = applyMatrix(event, mMatrixInverse);
        try {
            return super.dispatchTouchEvent(invertedEvent);
        } finally {
            invertedEvent.recycle();
        }
    }

    @Override
    public ViewParent invalidateChildInParent(int[] location, Rect dirty) {
        // Invalidating correct rectangle
        applyMatrix(dirty, mMatrix);
        return super.invalidateChildInParent(location, dirty);
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        // Passing original event to controller
        return mController.onTouch(this, mCurrentMotionEvent);
    }

    @Override
    protected void onSizeChanged(int w, int h, int oldw, int oldh) {
        super.onSizeChanged(w, h, oldw, oldh);

        mController.getSettings().setViewport(w - getPaddingLeft() - getPaddingRight(),
                h - getPaddingTop() - getPaddingBottom());
        mController.updateState();
    }

    @Override
    protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
        super.onLayout(changed, left, top, right, bottom);

        View child = getChildCount() == 0 ? null : getChildAt(0);
        if (child != null) {
            mController.getSettings().setSize(child.getWidth(), child.getHeight());
            mController.updateState();
        }
    }

    @Override
    public void onStateChanged(State state) {
        state.get(mMatrix);
        mMatrix.invert(mMatrixInverse);
        invalidate();
    }

    @Override
    protected void dispatchDraw(Canvas canvas) {
        canvas.save();
        canvas.concat(mMatrix);
        super.dispatchDraw(canvas);
        canvas.restore();
    }

    @Override
    public void addView(View child, int index, ViewGroup.LayoutParams params) {
        if (getChildCount() != 0) throw new IllegalArgumentException("GestureLayout can contain only one child");
        super.addView(child, index, params);
    }


    private MotionEvent applyMatrix(MotionEvent event, Matrix matrix) {
        MotionEvent copy = MotionEvent.obtain(event);
        mTmpPointArray[0] = event.getX();
        mTmpPointArray[1] = event.getY();
        matrix.mapPoints(mTmpPointArray);
        copy.setLocation(mTmpPointArray[0], mTmpPointArray[1]);
        return copy;
    }

    private void applyMatrix(Rect rect, Matrix matrix) {
        mTmpFloatRect.set(rect.left, rect.top, rect.right, rect.bottom);
        matrix.mapRect(mTmpFloatRect);
        rect.set(Math.round(mTmpFloatRect.left), Math.round(mTmpFloatRect.top),
                Math.round(mTmpFloatRect.right), Math.round(mTmpFloatRect.bottom));
    }

}

Java Source Code List

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