package com.android.launcher3;
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import static com.android.launcher3.util.SystemUiController.FLAG_DARK_NAV;
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import static com.android.launcher3.util.SystemUiController.UI_STATE_ROOT_VIEW;
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import android.annotation.TargetApi;
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import android.app.ActivityManager;
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import android.content.Context;
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import android.graphics.Canvas;
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import android.graphics.Color;
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import android.graphics.Insets;
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import android.graphics.Paint;
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import android.graphics.Rect;
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import android.os.Build;
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import android.util.AttributeSet;
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import android.view.View;
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import android.view.ViewDebug;
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import android.view.WindowInsets;
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import java.util.Collections;
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import java.util.List;
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public class LauncherRootView extends InsettableFrameLayout {
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private final Rect mTempRect = new Rect();
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private final Launcher mLauncher;
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private final Paint mOpaquePaint;
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@ViewDebug.ExportedProperty(category = "launcher")
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private final Rect mConsumedInsets = new Rect();
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@ViewDebug.ExportedProperty(category = "launcher")
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private static final List<Rect> SYSTEM_GESTURE_EXCLUSION_RECT =
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Collections.singletonList(new Rect());
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private View mAlignedView;
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private WindowStateListener mWindowStateListener;
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@ViewDebug.ExportedProperty(category = "launcher")
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private boolean mDisallowBackGesture;
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public LauncherRootView(Context context, AttributeSet attrs) {
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super(context, attrs);
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mOpaquePaint = new Paint(Paint.ANTI_ALIAS_FLAG);
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mOpaquePaint.setColor(Color.BLACK);
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mOpaquePaint.setStyle(Paint.Style.FILL);
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mLauncher = Launcher.getLauncher(context);
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}
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@Override
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protected void onFinishInflate() {
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if (getChildCount() > 0) {
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// LauncherRootView contains only one child, which should be aligned
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// based on the horizontal insets.
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mAlignedView = getChildAt(0);
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}
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super.onFinishInflate();
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}
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private void handleSystemWindowInsets(Rect insets) {
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mConsumedInsets.setEmpty();
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boolean drawInsetBar = false;
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if (mLauncher.isInMultiWindowMode()
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&& (insets.left > 0 || insets.right > 0 || insets.bottom > 0)) {
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mConsumedInsets.left = insets.left;
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mConsumedInsets.right = insets.right;
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mConsumedInsets.bottom = insets.bottom;
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insets.set(0, insets.top, 0, 0);
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drawInsetBar = true;
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} else if ((insets.right > 0 || insets.left > 0) &&
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getContext().getSystemService(ActivityManager.class).isLowRamDevice()) {
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mConsumedInsets.left = insets.left;
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mConsumedInsets.right = insets.right;
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insets.set(0, insets.top, 0, insets.bottom);
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drawInsetBar = true;
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}
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mLauncher.getSystemUiController().updateUiState(
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UI_STATE_ROOT_VIEW, drawInsetBar ? FLAG_DARK_NAV : 0);
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// Update device profile before notifying th children.
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mLauncher.updateInsets(insets);
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boolean resetState = !insets.equals(mInsets);
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setInsets(insets);
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if (mAlignedView != null) {
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// Apply margins on aligned view to handle consumed insets.
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MarginLayoutParams lp = (MarginLayoutParams) mAlignedView.getLayoutParams();
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if (lp.leftMargin != mConsumedInsets.left || lp.rightMargin != mConsumedInsets.right ||
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lp.bottomMargin != mConsumedInsets.bottom) {
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lp.leftMargin = mConsumedInsets.left;
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lp.rightMargin = mConsumedInsets.right;
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lp.topMargin = mConsumedInsets.top;
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lp.bottomMargin = mConsumedInsets.bottom;
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mAlignedView.setLayoutParams(lp);
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}
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}
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if (resetState) {
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mLauncher.getStateManager().reapplyState(true /* cancelCurrentAnimation */);
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}
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}
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@Override
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public WindowInsets onApplyWindowInsets(WindowInsets insets) {
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mTempRect.set(insets.getSystemWindowInsetLeft(), insets.getSystemWindowInsetTop(),
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insets.getSystemWindowInsetRight(), insets.getSystemWindowInsetBottom());
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handleSystemWindowInsets(mTempRect);
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if (Utilities.ATLEAST_Q) {
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return insets.inset(mConsumedInsets.left, mConsumedInsets.top,
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mConsumedInsets.right, mConsumedInsets.bottom);
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} else {
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return insets.replaceSystemWindowInsets(mTempRect);
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}
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}
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@Override
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public void setInsets(Rect insets) {
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// If the insets haven't changed, this is a no-op. Avoid unnecessary layout caused by
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// modifying child layout params.
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if (!insets.equals(mInsets)) {
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super.setInsets(insets);
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}
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}
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public void dispatchInsets() {
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mLauncher.updateInsets(mInsets);
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super.setInsets(mInsets);
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}
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@Override
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protected void dispatchDraw(Canvas canvas) {
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super.dispatchDraw(canvas);
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// If the right inset is opaque, draw a black rectangle to ensure that is stays opaque.
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if (mConsumedInsets.right > 0) {
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int width = getWidth();
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canvas.drawRect(width - mConsumedInsets.right, 0, width, getHeight(), mOpaquePaint);
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}
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if (mConsumedInsets.left > 0) {
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canvas.drawRect(0, 0, mConsumedInsets.left, getHeight(), mOpaquePaint);
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}
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if (mConsumedInsets.bottom > 0) {
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int height = getHeight();
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canvas.drawRect(0, height - mConsumedInsets.bottom, getWidth(), height, mOpaquePaint);
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}
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}
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public void setWindowStateListener(WindowStateListener listener) {
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mWindowStateListener = listener;
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}
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@Override
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public void onWindowFocusChanged(boolean hasWindowFocus) {
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super.onWindowFocusChanged(hasWindowFocus);
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if (mWindowStateListener != null) {
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mWindowStateListener.onWindowFocusChanged(hasWindowFocus);
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}
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}
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@Override
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protected void onWindowVisibilityChanged(int visibility) {
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super.onWindowVisibilityChanged(visibility);
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if (mWindowStateListener != null) {
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mWindowStateListener.onWindowVisibilityChanged(visibility);
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}
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}
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@Override
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protected void onLayout(boolean changed, int l, int t, int r, int b) {
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super.onLayout(changed, l, t, r, b);
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SYSTEM_GESTURE_EXCLUSION_RECT.get(0).set(l, t, r, b);
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setDisallowBackGesture(mDisallowBackGesture);
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}
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@TargetApi(Build.VERSION_CODES.Q)
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public void setDisallowBackGesture(boolean disallowBackGesture) {
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if (!Utilities.ATLEAST_Q) {
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return;
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}
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mDisallowBackGesture = disallowBackGesture;
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setSystemGestureExclusionRects(mDisallowBackGesture
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? SYSTEM_GESTURE_EXCLUSION_RECT
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: Collections.emptyList());
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}
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public interface WindowStateListener {
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void onWindowFocusChanged(boolean hasFocus);
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void onWindowVisibilityChanged(int visibility);
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}
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}
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