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[Side Sheet] Added
LeftSheetDelegate and left sheet support for sta…
…ndard and coplanar side sheets. Standard and coplanar side sheets now support sliding and dragging from the left side, as well as automatic RTL mirroring when `layout_gravity` is set to `start` or `end`. Change the sheet edge by setting `layout_gravity` on the side sheet view in XML or programmatically. PiperOrigin-RevId: 518048965
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129 changes: 129 additions & 0 deletions
129
lib/java/com/google/android/material/sidesheet/LeftSheetDelegate.java
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| /* | ||
| * Copyright (C) 2023 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. | ||
| */ | ||
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| package com.google.android.material.sidesheet; | ||
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| import static java.lang.Math.max; | ||
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| import android.view.View; | ||
| import android.view.ViewGroup.MarginLayoutParams; | ||
| import androidx.annotation.NonNull; | ||
| import androidx.coordinatorlayout.widget.CoordinatorLayout; | ||
| import com.google.android.material.sidesheet.Sheet.SheetEdge; | ||
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| /** | ||
| * A delegate for {@link SideSheetBehavior} to handle positioning logic for sheets based on the left | ||
| * edge of the screen that expand from left to right. | ||
| */ | ||
| final class LeftSheetDelegate extends SheetDelegate { | ||
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| final SideSheetBehavior<? extends View> sheetBehavior; | ||
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| LeftSheetDelegate(@NonNull SideSheetBehavior<? extends View> sheetBehavior) { | ||
| this.sheetBehavior = sheetBehavior; | ||
| } | ||
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| @SheetEdge | ||
| @Override | ||
| int getSheetEdge() { | ||
| return SideSheetBehavior.EDGE_LEFT; | ||
| } | ||
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| /** Returns the sheet's offset in pixels from the origin edge when hidden. */ | ||
| @Override | ||
| int getHiddenOffset() { | ||
| // Return the parent's width in pixels, which results in the sheet being offset entirely off of | ||
| // screen. | ||
| return -sheetBehavior.getChildWidth() - sheetBehavior.getInnerMargin(); | ||
| } | ||
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| /** Returns the sheet's offset in pixels from the origin edge when expanded. */ | ||
| @Override | ||
| int getExpandedOffset() { | ||
| // Calculate the expanded offset based on the width of the content. | ||
| return max(0, sheetBehavior.getParentInnerEdge() + sheetBehavior.getInnerMargin()); | ||
| } | ||
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| /** Whether the view has been released from a drag close to the origin edge. */ | ||
| @Override | ||
| boolean isReleasedCloseToOriginEdge(@NonNull View releasedChild) { | ||
| // To be considered released close to the origin (left) edge, the released child's right must | ||
| // be at least halfway to the origin (left) edge of the screen. | ||
| return releasedChild.getRight() < (getExpandedOffset() - getHiddenOffset()) / 2; | ||
| } | ||
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| @Override | ||
| boolean isSwipeSignificant(float xVelocity, float yVelocity) { | ||
| return SheetUtils.isSwipeMostlyHorizontal(xVelocity, yVelocity) | ||
| && Math.abs(xVelocity) > sheetBehavior.getSignificantVelocityThreshold(); | ||
| } | ||
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| @Override | ||
| boolean shouldHide(@NonNull View child, float velocity) { | ||
| final float newLeft = child.getLeft() + velocity * sheetBehavior.getHideFriction(); | ||
| return Math.abs(newLeft) > sheetBehavior.getHideThreshold(); | ||
| } | ||
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| @Override | ||
| <V extends View> int getOuterEdge(@NonNull V child) { | ||
| return child.getRight() + sheetBehavior.getInnerMargin(); | ||
| } | ||
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| @Override | ||
| float calculateSlideOffset(int left) { | ||
| float hiddenOffset = getHiddenOffset(); | ||
| float sheetWidth = getExpandedOffset() - hiddenOffset; | ||
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| return (left - hiddenOffset) / sheetWidth; | ||
| } | ||
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| @Override | ||
| void updateCoplanarSiblingLayoutParams( | ||
| @NonNull MarginLayoutParams coplanarSiblingLayoutParams, int sheetLeft, int sheetRight) { | ||
| int parentWidth = sheetBehavior.getParentWidth(); | ||
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| // Wait until the sheet partially enters the screen to avoid an initial content jump to the | ||
| // right edge of the screen. | ||
| if (sheetLeft <= parentWidth) { | ||
| coplanarSiblingLayoutParams.leftMargin = sheetRight; | ||
| } | ||
| } | ||
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| @Override | ||
| public int getParentInnerEdge(@NonNull CoordinatorLayout parent) { | ||
| return parent.getLeft(); | ||
| } | ||
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| @Override | ||
| int calculateInnerMargin(@NonNull MarginLayoutParams marginLayoutParams) { | ||
| return marginLayoutParams.leftMargin; | ||
| } | ||
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| @Override | ||
| int getMinViewPositionHorizontal() { | ||
| return -sheetBehavior.getChildWidth(); | ||
| } | ||
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| @Override | ||
| int getMaxViewPositionHorizontal() { | ||
| return sheetBehavior.getInnerMargin(); | ||
| } | ||
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| @Override | ||
| boolean isExpandingOutwards(float xVelocity) { | ||
| return xVelocity > 0; | ||
| } | ||
| } |
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