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