Android Open Source - android-floating-action-button Floating Actions Menu

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License

The source code is released under:

Apache License

Java Source Code

package in.sahildave.floatingactionbutton;
// w ww  .  j  a  v  a  2s  .  c  o  m
import android.animation.AnimatorSet;
import android.animation.ObjectAnimator;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.drawable.Drawable;
import android.graphics.drawable.LayerDrawable;
import android.os.Parcel;
import android.os.Parcelable;
import android.support.annotation.ColorRes;
import android.support.annotation.NonNull;
import android.util.AttributeSet;
import android.view.ContextThemeWrapper;
import android.view.View;
import android.view.ViewGroup;
import android.view.animation.DecelerateInterpolator;
import android.view.animation.Interpolator;
import android.view.animation.OvershootInterpolator;
import android.widget.TextView;

public class FloatingActionsMenu extends ViewGroup {
    public static final int EXPAND_UP = 0;
    public static final int EXPAND_DOWN = 1;
    public static final int EXPAND_LEFT = 2;
    public static final int EXPAND_RIGHT = 3;

    private static final int ANIMATION_DURATION = 300;
    private static final float COLLAPSED_PLUS_ROTATION = 0f;
    private static final float EXPANDED_PLUS_ROTATION = 90f + 45f;

    private int mPlusButtonPlusColor;
    private int mPlusButtonColorNormal;
    private int mPlusButtonColorPressed;
    private int mExpandDirection;

    private int mButtonSpacing;
    private int mLabelsMargin;
    private int mLabelsVerticalOffset;

    private boolean mExpanded;

    private AnimatorSet mExpandAnimation = new AnimatorSet().setDuration(ANIMATION_DURATION);
    private AnimatorSet mCollapseAnimation = new AnimatorSet().setDuration(ANIMATION_DURATION);
    private PlusFloatingActionButton mPlusButton;
    private RotatingDrawable mRotatingDrawable;
    private int mLabelsStyle;
    private int mButtonsCount;

    public FloatingActionsMenu(Context context) {
        this(context, null);
    }

    public FloatingActionsMenu(Context context, AttributeSet attrs) {
        super(context, attrs);
        init(context, attrs);
    }

    public FloatingActionsMenu(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        init(context, attrs);
    }

    private void init(Context context, AttributeSet attributeSet) {
        mButtonSpacing = (int) (getResources().getDimension(R.dimen.fab_actions_spacing) - getResources().getDimension(R.dimen.fab_shadow_radius) - getResources().getDimension(R.dimen.fab_shadow_offset));
        mLabelsMargin = getResources().getDimensionPixelSize(R.dimen.fab_labels_margin);
        mLabelsVerticalOffset = getResources().getDimensionPixelSize(R.dimen.fab_shadow_offset);

        TypedArray attr = context.obtainStyledAttributes(attributeSet, R.styleable.FloatingActionsMenu, 0, 0);
        mPlusButtonPlusColor = attr.getColor(R.styleable.FloatingActionsMenu_fab_addButtonPlusIconColor, getColor(android.R.color.white));
        mPlusButtonColorNormal = attr.getColor(R.styleable.FloatingActionsMenu_fab_addButtonColorNormal, getColor(android.R.color.holo_blue_dark));
        mPlusButtonColorPressed = attr.getColor(R.styleable.FloatingActionsMenu_fab_addButtonColorPressed, getColor(android.R.color.holo_blue_light));
        mExpandDirection = attr.getInt(R.styleable.FloatingActionsMenu_fab_expandDirection, EXPAND_UP);
        mLabelsStyle = attr.getResourceId(R.styleable.FloatingActionsMenu_fab_labelStyle, 0);
        attr.recycle();

        if (mLabelsStyle != 0 && expandsHorizontally()) {
            throw new IllegalStateException("Action labels in horizontal expand orientation is not supported.");
        }

        createAddButton(context);
    }

    private boolean expandsHorizontally() {
        return mExpandDirection == EXPAND_LEFT || mExpandDirection == EXPAND_RIGHT;
    }

    private static class RotatingDrawable extends LayerDrawable {
        public RotatingDrawable(Drawable drawable) {
            super(new Drawable[] { drawable });
        }

        private float mRotation;

        @SuppressWarnings("UnusedDeclaration")
        public float getRotation() {
            return mRotation;
        }

        @SuppressWarnings("UnusedDeclaration")
        public void setRotation(float rotation) {
            mRotation = rotation;
            invalidateSelf();
        }

        @Override
        public void draw(Canvas canvas) {
            canvas.save();
            canvas.rotate(mRotation, getBounds().centerX(), getBounds().centerY());
            super.draw(canvas);
            canvas.restore();
        }
    }

    private void createAddButton(Context context) {
        mPlusButton = new PlusFloatingActionButton(context) {
            @Override
            void updateBackground() {
                mPlusColor = mPlusButtonPlusColor;
                mColorNormal = mPlusButtonColorNormal;
                mColorPressed = mPlusButtonColorPressed;
                super.updateBackground();
            }

            @Override
            Drawable getIconDrawable() {
                final RotatingDrawable rotatingDrawable = new RotatingDrawable(super.getIconDrawable());
                mRotatingDrawable = rotatingDrawable;

                final OvershootInterpolator interpolator = new OvershootInterpolator();

                final ObjectAnimator collapseAnimator = ObjectAnimator.ofFloat(rotatingDrawable, "rotation", EXPANDED_PLUS_ROTATION, COLLAPSED_PLUS_ROTATION);
                final ObjectAnimator expandAnimator = ObjectAnimator.ofFloat(rotatingDrawable, "rotation", COLLAPSED_PLUS_ROTATION, EXPANDED_PLUS_ROTATION);

                collapseAnimator.setInterpolator(interpolator);
                expandAnimator.setInterpolator(interpolator);

                mExpandAnimation.play(expandAnimator);
                mCollapseAnimation.play(collapseAnimator);

                return rotatingDrawable;
            }
        };

        mPlusButton.setId(R.id.fab_expand_menu_button);
        mPlusButton.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                toggle();
            }
        });

        addView(mPlusButton, super.generateDefaultLayoutParams());
    }

    public void addButton(FloatingActionButton button) {
        addView(button, mButtonsCount - 1);
        mButtonsCount++;

        if (mLabelsStyle != 0) {
            createLabels();
        }
    }

    private int getColor(@ColorRes int id) {
        return getResources().getColor(id);
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        measureChildren(widthMeasureSpec, heightMeasureSpec);

        int width = 0;
        int height = 0;

        int maxLabelWidth = 0;

        for (int i = 0; i < mButtonsCount; i++) {
            View child = getChildAt(i);

            switch (mExpandDirection) {
                case EXPAND_UP:
                case EXPAND_DOWN:
                    width = Math.max(width, child.getMeasuredWidth());
                    height += child.getMeasuredHeight();
                    break;
                case EXPAND_LEFT:
                case EXPAND_RIGHT:
                    width += child.getMeasuredWidth();
                    height = Math.max(height, child.getMeasuredHeight());
                    break;
            }

            if (!expandsHorizontally()) {
                TextView label = (TextView) child.getTag(R.id.fab_label);
                if (label != null) {
                    maxLabelWidth = Math.max(maxLabelWidth, label.getMeasuredWidth());
                }
            }
        }

        if (!expandsHorizontally()) {
            width += maxLabelWidth + mLabelsMargin;
        }

        switch (mExpandDirection) {
            case EXPAND_UP:
            case EXPAND_DOWN:
                height += mButtonSpacing * (getChildCount() - 1);
                height = adjustForOvershoot(height);
                break;
            case EXPAND_LEFT:
            case EXPAND_RIGHT:
                width += mButtonSpacing * (getChildCount() - 1);
                width = adjustForOvershoot(width);
                break;
        }

        setMeasuredDimension(width, height);
    }

    private int adjustForOvershoot(int dimension) {
        return dimension * 12 / 10;
    }

    @Override
    protected void onLayout(boolean changed, int l, int t, int r, int b) {
        switch (mExpandDirection) {
            case EXPAND_UP:
            case EXPAND_DOWN:
                boolean expandUp = mExpandDirection == EXPAND_UP;

                int plusButtonY = expandUp ? b - t - mPlusButton.getMeasuredHeight() : 0;
                int plusButtonLeft = r - l - mPlusButton.getMeasuredWidth();
                mPlusButton.layout(plusButtonLeft, plusButtonY, plusButtonLeft + mPlusButton.getMeasuredWidth(), plusButtonY + mPlusButton.getMeasuredHeight());

                int labelsRight = plusButtonLeft - mLabelsMargin;

                int nextY = expandUp ?
                        plusButtonY - mButtonSpacing :
                        plusButtonY + mPlusButton.getMeasuredHeight() + mButtonSpacing;

                for (int i = mButtonsCount - 1; i >= 0; i--) {
                    final View child = getChildAt(i);

                    if (child == mPlusButton) continue;

                    int childX = plusButtonLeft + (mPlusButton.getMeasuredWidth() - child.getMeasuredWidth()) / 2;
                    int childY = expandUp ? nextY - child.getMeasuredHeight() : nextY;
                    child.layout(childX, childY, childX + child.getMeasuredWidth(), childY + child.getMeasuredHeight());

                    float collapsedTranslation = plusButtonY - childY;
                    float expandedTranslation = 0f;

                    child.setTranslationY(mExpanded ? expandedTranslation : collapsedTranslation);
                    child.setAlpha(mExpanded ? 1f : 0f);

                    LayoutParams params = (LayoutParams) child.getLayoutParams();
                    params.mCollapseDir.setFloatValues(expandedTranslation, collapsedTranslation);
                    params.mExpandDir.setFloatValues(collapsedTranslation, expandedTranslation);
                    params.setAnimationsTarget(child);

                    View label = (View) child.getTag(R.id.fab_label);
                    if (label != null) {
                        int labelLeft = labelsRight - label.getMeasuredWidth();
                        int labelTop = childY - mLabelsVerticalOffset + (child.getMeasuredHeight() - label.getMeasuredHeight()) / 2;

                        label.layout(labelLeft, labelTop, labelsRight, labelTop + label.getMeasuredHeight());

                        label.setTranslationY(mExpanded ? expandedTranslation : collapsedTranslation);
                        label.setAlpha(mExpanded ? 1f : 0f);

                        LayoutParams labelParams = (LayoutParams) label.getLayoutParams();
                        labelParams.mCollapseDir.setFloatValues(expandedTranslation, collapsedTranslation);
                        labelParams.mExpandDir.setFloatValues(collapsedTranslation, expandedTranslation);
                        labelParams.setAnimationsTarget(label);
                    }

                    nextY = expandUp ?
                            childY - mButtonSpacing :
                            childY + child.getMeasuredHeight() + mButtonSpacing;
                }
                break;

            case EXPAND_LEFT:
            case EXPAND_RIGHT:
                boolean expandLeft = mExpandDirection == EXPAND_LEFT;

                int addButtonX = expandLeft ? r - l - mPlusButton.getMeasuredWidth() : 0;
                mPlusButton.layout(addButtonX, 0, addButtonX + mPlusButton.getMeasuredWidth(), mPlusButton.getMeasuredHeight());

                int nextX = expandLeft ?
                        addButtonX - mButtonSpacing :
                        addButtonX + mPlusButton.getMeasuredWidth() + mButtonSpacing;

                for (int i = mButtonsCount - 1; i >= 0; i--) {
                    final View child = getChildAt(i);

                    if (child == mPlusButton) continue;

                    int childX = expandLeft ? nextX - child.getMeasuredWidth() : nextX;
                    int childY = (mPlusButton.getMeasuredHeight() - child.getMeasuredHeight()) / 2;
                    child.layout(childX, childY, childX + child.getMeasuredWidth(), childY + child.getMeasuredHeight());

                    float collapsedTranslation = addButtonX - childX;
                    float expandedTranslation = 0f;

                    child.setTranslationX(mExpanded ? expandedTranslation : collapsedTranslation);
                    child.setAlpha(mExpanded ? 1f : 0f);

                    LayoutParams params = (LayoutParams) child.getLayoutParams();
                    params.mCollapseDir.setFloatValues(expandedTranslation, collapsedTranslation);
                    params.mExpandDir.setFloatValues(collapsedTranslation, expandedTranslation);
                    params.setAnimationsTarget(child);

                    nextX = expandLeft ?
                            childX - mButtonSpacing :
                            childX + child.getMeasuredWidth() + mButtonSpacing;
                }

                break;
        }
    }

    @Override
    protected ViewGroup.LayoutParams generateDefaultLayoutParams() {
        return new LayoutParams(super.generateDefaultLayoutParams());
    }

    @Override
    public ViewGroup.LayoutParams generateLayoutParams(AttributeSet attrs) {
        return new LayoutParams(super.generateLayoutParams(attrs));
    }

    @Override
    protected ViewGroup.LayoutParams generateLayoutParams(ViewGroup.LayoutParams p) {
        return new LayoutParams(super.generateLayoutParams(p));
    }

    @Override
    protected boolean checkLayoutParams(ViewGroup.LayoutParams p) {
        return super.checkLayoutParams(p);
    }

    private static Interpolator sExpandInterpolator = new OvershootInterpolator();
    private static Interpolator sCollapseInterpolator = new DecelerateInterpolator(3f);
    private static Interpolator sAlphaExpandInterpolator = new DecelerateInterpolator();

    private class LayoutParams extends ViewGroup.LayoutParams {

        private ObjectAnimator mExpandDir = new ObjectAnimator();
        private ObjectAnimator mExpandAlpha = new ObjectAnimator();
        private ObjectAnimator mCollapseDir = new ObjectAnimator();
        private ObjectAnimator mCollapseAlpha = new ObjectAnimator();

        public LayoutParams(ViewGroup.LayoutParams source) {
            super(source);

            mExpandDir.setInterpolator(sExpandInterpolator);
            mExpandAlpha.setInterpolator(sAlphaExpandInterpolator);
            mCollapseDir.setInterpolator(sCollapseInterpolator);
            mCollapseAlpha.setInterpolator(sCollapseInterpolator);

            mCollapseAlpha.setProperty(View.ALPHA);
            mCollapseAlpha.setFloatValues(1f, 0f);

            mExpandAlpha.setProperty(View.ALPHA);
            mExpandAlpha.setFloatValues(0f, 1f);

            switch (mExpandDirection) {
                case EXPAND_UP:
                case EXPAND_DOWN:
                    mCollapseDir.setProperty(View.TRANSLATION_Y);
                    mExpandDir.setProperty(View.TRANSLATION_Y);
                    break;
                case EXPAND_LEFT:
                case EXPAND_RIGHT:
                    mCollapseDir.setProperty(View.TRANSLATION_X);
                    mExpandDir.setProperty(View.TRANSLATION_X);
                    break;
            }

            mExpandAnimation.play(mExpandAlpha);
            mExpandAnimation.play(mExpandDir);

            mCollapseAnimation.play(mCollapseAlpha);
            mCollapseAnimation.play(mCollapseDir);
        }

        public void setAnimationsTarget(View view) {
            mCollapseAlpha.setTarget(view);
            mCollapseDir.setTarget(view);
            mExpandAlpha.setTarget(view);
            mExpandDir.setTarget(view);
        }
    }

    @Override
    protected void onFinishInflate() {
        super.onFinishInflate();

        bringChildToFront(mPlusButton);
        mButtonsCount = getChildCount();

        if (mLabelsStyle != 0) {
            createLabels();
        }
    }

    private void createLabels() {
        Context context = new ContextThemeWrapper(getContext(), mLabelsStyle);

        for (int i = 0; i < mButtonsCount; i++) {
            FloatingActionButton button = (FloatingActionButton) getChildAt(i);
            String title = button.getTitle();

            if (button == mPlusButton || title == null ||
                    button.getTag(R.id.fab_label) != null) continue;

            TextView label = new TextView(context);
            label.setText(button.getTitle());
            addView(label);

            button.setTag(R.id.fab_label, label);
        }
    }

    public void collapse() {
        if (mExpanded) {
            mExpanded = false;
            mCollapseAnimation.start();
            mExpandAnimation.cancel();
        }
    }

    public void toggle() {
        if (mExpanded) {
            collapse();
        } else {
            expand();
        }
    }

    public void expand() {
        if (!mExpanded) {
            mExpanded = true;
            mCollapseAnimation.cancel();
            mExpandAnimation.start();
        }
    }

    public boolean isExpanded() {
        return mExpanded;
    }

    @Override
    public Parcelable onSaveInstanceState() {
        Parcelable superState = super.onSaveInstanceState();
        SavedState savedState = new SavedState(superState);
        savedState.mExpanded = mExpanded;

        return savedState;
    }

    @Override
    public void onRestoreInstanceState(Parcelable state) {
        if (state instanceof SavedState) {
            SavedState savedState = (SavedState) state;
            mExpanded = savedState.mExpanded;

            if (mRotatingDrawable != null) {
                mRotatingDrawable.setRotation(mExpanded ? EXPANDED_PLUS_ROTATION : COLLAPSED_PLUS_ROTATION);
            }

            super.onRestoreInstanceState(savedState.getSuperState());
        } else {
            super.onRestoreInstanceState(state);
        }
    }

    public static class SavedState extends BaseSavedState {
        public boolean mExpanded;

        public SavedState(Parcelable parcel) {
            super(parcel);
        }

        private SavedState(Parcel in) {
            super(in);
            mExpanded = in.readInt() == 1;
        }

        @Override
        public void writeToParcel(@NonNull Parcel out, int flags) {
            super.writeToParcel(out, flags);
            out.writeInt(mExpanded ? 1 : 0);
        }

        public static final Creator<SavedState> CREATOR = new Creator<SavedState>() {

            @Override
            public SavedState createFromParcel(Parcel in) {
                return new SavedState(in);
            }

            @Override
            public SavedState[] newArray(int size) {
                return new SavedState[size];
            }
        };
    }
}

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