src/com/android/launcher3/touch/PortraitPagedViewHandler.java

/*
 * Copyright (C) 2019 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.android.launcher3.touch;

import static com.android.launcher3.LauncherAnimUtils.VIEW_TRANSLATE_X;
import static com.android.launcher3.LauncherAnimUtils.VIEW_TRANSLATE_Y;
import static com.android.launcher3.touch.SingleAxisSwipeDetector.VERTICAL;

import android.content.res.Resources;
import android.graphics.PointF;
import android.graphics.Rect;
import android.graphics.RectF;
import android.util.FloatProperty;
import android.view.MotionEvent;
import android.view.Surface;
import android.view.VelocityTracker;
import android.view.View;
import android.view.accessibility.AccessibilityEvent;
import android.widget.LinearLayout;

import com.android.launcher3.DeviceProfile;
import com.android.launcher3.PagedView;
import com.android.launcher3.Utilities;
import com.android.launcher3.util.OverScroller;

public class PortraitPagedViewHandler implements PagedOrientationHandler {

    @Override
    public int getPrimaryValue(int x, int y) {
        return x;
    }

    @Override
    public int getSecondaryValue(int x, int y) {
        return y;
    }

    @Override
    public void delegateScrollTo(PagedView pagedView, int secondaryScroll, int primaryScroll) {
        pagedView.superScrollTo(primaryScroll, secondaryScroll);
    }

    @Override
    public void delegateScrollBy(PagedView pagedView, int unboundedScroll, int x, int y) {
        pagedView.scrollTo(unboundedScroll + x, pagedView.getScrollY() + y);
    }

    @Override
    public void scrollerStartScroll(OverScroller scroller, int newPosition) {
        scroller.startScroll(newPosition - scroller.getCurrPos(), scroller.getCurrPos());
    }

    @Override
    public void getCurveProperties(PagedView view, Rect insets, CurveProperties out) {
        out.scroll = view.getScrollX();
        out.halfPageSize = view.getNormalChildWidth() / 2;
        out.halfScreenSize = view.getMeasuredWidth() / 2;
        out.screenCenter = insets.left + view.getPaddingLeft() + out.scroll + out.halfPageSize;
        out.pageParentScale = view.getScaleX();
    }

    @Override
    public boolean isGoingUp(float displacement, boolean isRtl) {
        // Ignore rtl since it only affects X value displacement, Y displacement doesn't change
        return displacement < 0;
    }

    @Override
    public boolean isLayoutNaturalToLauncher() {
        return true;
    }

    @Override
    public void adjustFloatingIconStartVelocity(PointF velocity) {
        //no-op
    }

    @Override
    public void delegateScrollTo(PagedView pagedView, int primaryScroll) {
        pagedView.superScrollTo(primaryScroll, pagedView.getScrollY());
    }

    @Override
    public <T> void set(T target, Int2DAction<T> action, int param) {
        action.call(target, param, 0);
    }

    @Override
    public <T> void set(T target, Float2DAction<T> action, float param) {
        action.call(target, param, 0);
    }

    @Override
    public float getPrimaryDirection(MotionEvent event, int pointerIndex) {
        return event.getX(pointerIndex);
    }

    @Override
    public float getPrimaryVelocity(VelocityTracker velocityTracker, int pointerId) {
        return velocityTracker.getXVelocity(pointerId);
    }

    @Override
    public int getMeasuredSize(View view) {
        return view.getMeasuredWidth();
    }

    @Override
    public float getPrimarySize(RectF rect) {
        return rect.width();
    }

    @Override
    public int getClearAllScrollOffset(View view, boolean isRtl) {
        return (isRtl ? view.getPaddingRight() : - view.getPaddingLeft()) / 2;
    }

    @Override
    public int getSecondaryDimension(View view) {
        return view.getHeight();
    }

    @Override
    public FloatProperty<View> getPrimaryViewTranslate() {
        return VIEW_TRANSLATE_X;
    }

    @Override
    public FloatProperty<View> getSecondaryViewTranslate() {
        return VIEW_TRANSLATE_Y;
    }

    @Override
    public void setPrimaryAndResetSecondaryTranslate(View view, float translation) {
        view.setTranslationX(translation);
        view.setTranslationY(0);
    }

    @Override
    public int getPrimaryScroll(View view) {
        return view.getScrollX();
    }

    @Override
    public float getPrimaryScale(View view) {
        return view.getScaleX();
    }

    @Override
    public void setMaxScroll(AccessibilityEvent event, int maxScroll) {
        event.setMaxScrollX(maxScroll);
    }

    @Override
    public boolean getRecentsRtlSetting(Resources resources) {
        return !Utilities.isRtl(resources);
    }

    @Override
    public float getDegreesRotated() {
        return 0;
    }

    @Override
    public int getRotation() {
        return Surface.ROTATION_0;
    }

    @Override
    public int getChildStart(View view) {
        return view.getLeft();
    }

    @Override
    public float getChildStartWithTranslation(View view) {
        return view.getLeft() + view.getTranslationX();
    }

    @Override
    public int getCenterForPage(View view, Rect insets) {
        return (view.getPaddingTop() + view.getMeasuredHeight() + insets.top
            - insets.bottom - view.getPaddingBottom()) / 2;
    }

    @Override
    public int getScrollOffsetStart(View view, Rect insets) {
        return insets.left + view.getPaddingLeft();
    }

    @Override
    public int getScrollOffsetEnd(View view, Rect insets) {
        return view.getWidth() - view.getPaddingRight() - insets.right;
    }

    @Override
    public SingleAxisSwipeDetector.Direction getOppositeSwipeDirection() {
        return VERTICAL;
    }

    @Override
    public int getPrimaryTranslationDirectionFactor() {
        return 1;
    }

    @Override
    public int getTaskDismissDirectionFactor() {
        return -1;
    }

    @Override
    public int getTaskDragDisplacementFactor(boolean isRtl) {
        // Ignore rtl since it only affects X value displacement, Y displacement doesn't change
        return 1;
    }

    @Override
    public float getTaskMenuX(float x, View thumbnailView) {
        return x;
    }

    @Override
    public float getTaskMenuY(float y, View thumbnailView) {
        return y;
    }

    @Override
    public int getTaskMenuWidth(View view) {
        return view.getMeasuredWidth();
    }

    @Override
    public int getTaskMenuLayoutOrientation(boolean canRecentsActivityRotate,
        LinearLayout taskMenuLayout) {
        return canRecentsActivityRotate ? taskMenuLayout.getOrientation() : LinearLayout.VERTICAL;
    }

    @Override
    public void setLayoutParamsForTaskMenuOptionItem(LinearLayout.LayoutParams lp) {
        // no-op, defaults are fine
    }

    @Override
    public ChildBounds getChildBounds(View child, int childStart, int pageCenter,
        boolean layoutChild) {
        final int childWidth = child.getMeasuredWidth();
        final int childRight = childStart + childWidth;
        final int childHeight = child.getMeasuredHeight();
        final int childTop = pageCenter - childHeight / 2;
        if (layoutChild) {
            child.layout(childStart, childTop, childRight, childTop + childHeight);
        }
        return new ChildBounds(childWidth, childHeight, childRight, childTop);
    }

    @Override
    public int getDistanceToBottomOfRect(DeviceProfile dp, Rect rect) {
        return dp.heightPx - rect.bottom;
    }
}