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/*
* Copyright (C) 2021 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.taskbar;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Path;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import com.android.launcher3.R;
import com.android.launcher3.testing.TestLogging;
import com.android.launcher3.testing.TestProtocol;
import com.android.launcher3.util.TouchController;
import com.android.launcher3.views.BaseDragLayer;
import com.android.systemui.shared.system.ViewTreeObserverWrapper;
import com.android.systemui.shared.system.ViewTreeObserverWrapper.InsetsInfo;
import com.android.systemui.shared.system.ViewTreeObserverWrapper.OnComputeInsetsListener;
/**
* Top-level ViewGroup that hosts the TaskbarView as well as Views created by it such as Folder.
*/
public class TaskbarDragLayer extends BaseDragLayer<TaskbarActivityContext> {
private final Paint mTaskbarBackgroundPaint;
private final Path mInvertedLeftCornerPath, mInvertedRightCornerPath;
private final OnComputeInsetsListener mTaskbarInsetsComputer = this::onComputeTaskbarInsets;
// Initialized in init.
private TaskbarDragLayerController.TaskbarDragLayerCallbacks mControllerCallbacks;
private float mLeftCornerRadius, mRightCornerRadius;
private float mTaskbarBackgroundOffset;
public TaskbarDragLayer(@NonNull Context context) {
this(context, null);
}
public TaskbarDragLayer(@NonNull Context context, @Nullable AttributeSet attrs) {
this(context, attrs, 0);
}
public TaskbarDragLayer(@NonNull Context context, @Nullable AttributeSet attrs,
int defStyleAttr) {
this(context, attrs, defStyleAttr, 0);
}
public TaskbarDragLayer(@NonNull Context context, @Nullable AttributeSet attrs,
int defStyleAttr, int defStyleRes) {
super(context, attrs, 1 /* alphaChannelCount */);
mTaskbarBackgroundPaint = new Paint();
mTaskbarBackgroundPaint.setColor(getResources().getColor(R.color.taskbar_background));
mTaskbarBackgroundPaint.setAlpha(0);
mTaskbarBackgroundPaint.setFlags(Paint.ANTI_ALIAS_FLAG);
mTaskbarBackgroundPaint.setStyle(Paint.Style.FILL);
// Will be set in init(), but this ensures they are always non-null.
mInvertedLeftCornerPath = new Path();
mInvertedRightCornerPath = new Path();
}
public void init(TaskbarDragLayerController.TaskbarDragLayerCallbacks callbacks) {
mControllerCallbacks = callbacks;
// Create the paths for the inverted rounded corners above the taskbar. Start with a filled
// square, and then subtracting out a circle from the appropriate corner.
mLeftCornerRadius = mActivity.getLeftCornerRadius();
mRightCornerRadius = mActivity.getRightCornerRadius();
Path square = new Path();
square.addRect(0, 0, mLeftCornerRadius, mLeftCornerRadius, Path.Direction.CW);
Path circle = new Path();
circle.addCircle(mLeftCornerRadius, 0, mLeftCornerRadius, Path.Direction.CW);
mInvertedLeftCornerPath.op(square, circle, Path.Op.DIFFERENCE);
square.reset();
square.addRect(0, 0, mRightCornerRadius, mRightCornerRadius, Path.Direction.CW);
circle.reset();
circle.addCircle(0, 0, mRightCornerRadius, Path.Direction.CW);
mInvertedRightCornerPath.op(square, circle, Path.Op.DIFFERENCE);
recreateControllers();
}
@Override
public void recreateControllers() {
mControllers = new TouchController[] {mActivity.getDragController()};
}
private void onComputeTaskbarInsets(InsetsInfo insetsInfo) {
if (mControllerCallbacks != null) {
mControllerCallbacks.updateInsetsTouchability(insetsInfo);
mControllerCallbacks.updateContentInsets(insetsInfo.contentInsets);
}
}
protected void onDestroy() {
ViewTreeObserverWrapper.removeOnComputeInsetsListener(mTaskbarInsetsComputer);
}
@Override
protected void onAttachedToWindow() {
super.onAttachedToWindow();
ViewTreeObserverWrapper.addOnComputeInsetsListener(getViewTreeObserver(),
mTaskbarInsetsComputer);
}
@Override
protected void onDetachedFromWindow() {
super.onDetachedFromWindow();
onDestroy();
}
@Override
protected boolean canFindActiveController() {
// Unlike super class, we want to be able to find controllers when touches occur in the
// gesture area. For example, this allows Folder to close itself when touching the Taskbar.
return true;
}
@Override
public void onViewRemoved(View child) {
super.onViewRemoved(child);
if (mControllerCallbacks != null) {
mControllerCallbacks.onDragLayerViewRemoved();
}
}
@Override
protected void dispatchDraw(Canvas canvas) {
float backgroundHeight = mControllerCallbacks.getTaskbarBackgroundHeight()
* (1f - mTaskbarBackgroundOffset);
canvas.save();
canvas.translate(0, canvas.getHeight() - backgroundHeight);
// Draw the background behind taskbar content.
canvas.drawRect(0, 0, canvas.getWidth(), backgroundHeight, mTaskbarBackgroundPaint);
// Draw the inverted rounded corners above the taskbar.
canvas.translate(0, -mLeftCornerRadius);
canvas.drawPath(mInvertedLeftCornerPath, mTaskbarBackgroundPaint);
canvas.translate(0, mLeftCornerRadius);
canvas.translate(canvas.getWidth() - mRightCornerRadius, -mRightCornerRadius);
canvas.drawPath(mInvertedRightCornerPath, mTaskbarBackgroundPaint);
canvas.restore();
super.dispatchDraw(canvas);
}
/**
* Sets the alpha of the background color behind all the Taskbar contents.
* @param alpha 0 is fully transparent, 1 is fully opaque.
*/
protected void setTaskbarBackgroundAlpha(float alpha) {
mTaskbarBackgroundPaint.setAlpha((int) (alpha * 255));
invalidate();
}
/**
* Sets the translation of the background color behind all the Taskbar contents.
* @param offset 0 is fully onscreen, 1 is fully offscreen.
*/
protected void setTaskbarBackgroundOffset(float offset) {
mTaskbarBackgroundOffset = offset;
invalidate();
}
@Override
public boolean dispatchTouchEvent(MotionEvent ev) {
TestLogging.recordMotionEvent(TestProtocol.SEQUENCE_MAIN, "Touch event", ev);
return super.dispatchTouchEvent(ev);
}
}
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