QtLayout.java

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// Copyright (C) 2022 The Qt Company Ltd.
// Copyright (C) 2012 BogDan Vatra <bogdan@kde.org>
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
 
package org.qtproject.qt.android;
 
import android.app.Activity;
import android.content.Context;
import android.graphics.Rect;
import android.os.Build;
import android.util.Log;
import android.util.AttributeSet;
import android.util.DisplayMetrics;
import android.view.Display;
import android.view.View;
import android.view.ViewGroup;
import android.view.WindowInsets;
import android.view.WindowManager;
import android.graphics.Insets;
import android.view.WindowMetrics;
import android.content.res.Configuration;
import android.content.res.Resources;
 
public class QtLayout extends ViewGroup
{
    private Runnable m_startApplicationRunnable;
 
    private int m_activityDisplayRotation = -1;
    private int m_ownDisplayRotation = -1;
    private int m_nativeOrientation = -1;
 
    public void setActivityDisplayRotation(int rotation)
    {
        m_activityDisplayRotation = rotation;
    }
 
    public void setNativeOrientation(int orientation)
    {
        m_nativeOrientation = orientation;
    }
 
    public int displayRotation()
    {
        return m_ownDisplayRotation;
    }
 
    public QtLayout(Context context, Runnable startRunnable)
    {
        super(context);
        m_startApplicationRunnable = startRunnable;
    }
 
    public QtLayout(Context context, AttributeSet attrs)
    {
        super(context, attrs);
    }
 
    public QtLayout(Context context, AttributeSet attrs, int defStyle)
    {
        super(context, attrs, defStyle);
    }
 
    @Override
    protected void onSizeChanged (int w, int h, int oldw, int oldh)
    {
        Activity activity = (Activity)getContext();
        if (activity == null)
            return;
 
        final WindowManager windowManager = activity.getWindowManager();
        Display display;
 
        final WindowInsets rootInsets = getRootWindowInsets();
 
        int insetLeft = 0;
        int insetTop = 0;
 
        int maxWidth = 0;
        int maxHeight = 0;
 
        if (android.os.Build.VERSION.SDK_INT < Build.VERSION_CODES.R) {
            display = windowManager.getDefaultDisplay();
 
            final DisplayMetrics maxMetrics = new DisplayMetrics();
            display.getRealMetrics(maxMetrics);
            maxWidth = maxMetrics.widthPixels;
            maxHeight = maxMetrics.heightPixels;
 
            insetLeft = rootInsets.getStableInsetLeft();
            insetTop = rootInsets.getStableInsetTop();
        } else {
            display = activity.getDisplay();
 
            final WindowMetrics maxMetrics = windowManager.getMaximumWindowMetrics();
            maxWidth = maxMetrics.getBounds().width();
            maxHeight = maxMetrics.getBounds().height();
 
            insetLeft = rootInsets.getInsetsIgnoringVisibility(WindowInsets.Type.systemBars()).left;
            insetTop = rootInsets.getInsetsIgnoringVisibility(WindowInsets.Type.systemBars()).top;
        }
 
        final DisplayMetrics displayMetrics = activity.getResources().getDisplayMetrics();
        double xdpi = displayMetrics.xdpi;
        double ydpi = displayMetrics.ydpi;
        double density = displayMetrics.density;
        double scaledDensity = displayMetrics.scaledDensity;
        float refreshRate = display.getRefreshRate();
 
        QtNative.setApplicationDisplayMetrics(maxWidth, maxHeight, insetLeft,
                                              insetTop, w, h,
                                              xdpi,ydpi,scaledDensity, density,
                                              refreshRate);
 
        int newRotation = display.getRotation();
        if (m_ownDisplayRotation != m_activityDisplayRotation
            && newRotation == m_activityDisplayRotation) {
            // If the saved rotation value does not match the one from the
            // activity, it means that we got orientation change before size
            // change, and the value was cached. So we need to notify about
            // orientation change now.
            QtNative.handleOrientationChanged(newRotation, m_nativeOrientation);
        }
        m_ownDisplayRotation = newRotation;
 
        if (m_startApplicationRunnable != null) {
            m_startApplicationRunnable.run();
            m_startApplicationRunnable = null;
        }
    }
 
    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec)
    {
        int count = getChildCount();
 
        int maxHeight = 0;
        int maxWidth = 0;
 
        // Find out how big everyone wants to be
        measureChildren(widthMeasureSpec, heightMeasureSpec);
 
        // Find rightmost and bottom-most child
        for (int i = 0; i < count; i++) {
            View child = getChildAt(i);
            if (child.getVisibility() != GONE) {
                int childRight;
                int childBottom;
 
                QtLayout.LayoutParams lp
                        = (QtLayout.LayoutParams) child.getLayoutParams();
 
                childRight = lp.x + child.getMeasuredWidth();
                childBottom = lp.y + child.getMeasuredHeight();
 
                maxWidth = Math.max(maxWidth, childRight);
                maxHeight = Math.max(maxHeight, childBottom);
            }
        }
 
        // Check against minimum height and width
        maxHeight = Math.max(maxHeight, getSuggestedMinimumHeight());
        maxWidth = Math.max(maxWidth, getSuggestedMinimumWidth());
 
        setMeasuredDimension(resolveSize(maxWidth, widthMeasureSpec),
                resolveSize(maxHeight, heightMeasureSpec));
    }
 
    @Override
    protected ViewGroup.LayoutParams generateDefaultLayoutParams()
    {
        return new LayoutParams(android.view.ViewGroup.LayoutParams.WRAP_CONTENT,
                                android.view.ViewGroup.LayoutParams.WRAP_CONTENT,
                                0,
                                0);
    }
 
    @Override
    protected void onLayout(boolean changed, int l, int t, int r, int b)
    {
        int count = getChildCount();
 
        for (int i = 0; i < count; i++) {
            View child = getChildAt(i);
            if (child.getVisibility() != GONE) {
                QtLayout.LayoutParams lp =
                        (QtLayout.LayoutParams) child.getLayoutParams();
 
                int childLeft = lp.x;
                int childTop = lp.y;
                child.layout(childLeft, childTop,
                        childLeft + child.getMeasuredWidth(),
                        childTop + child.getMeasuredHeight());
 
            }
        }
    }
 
    // Override to allow type-checking of LayoutParams.
    @Override
    protected boolean checkLayoutParams(ViewGroup.LayoutParams p)
    {
        return p instanceof QtLayout.LayoutParams;
    }
 
    @Override
    protected ViewGroup.LayoutParams generateLayoutParams(ViewGroup.LayoutParams p)
    {
        return new LayoutParams(p);
    }
 
    public static class LayoutParams extends ViewGroup.LayoutParams
    {
        public int x;
        public int y;
 
        public LayoutParams(int width, int height, int x, int y)
        {
            super(width, height);
            this.x = x;
            this.y = y;
        }
 
        public LayoutParams(ViewGroup.LayoutParams source)
        {
            super(source);
        }
    }
 
    public void moveChild(View view, int index)
    {
        if (view == null)
            return;
 
        if (indexOfChild(view) == -1)
            return;
 
        detachViewFromParent(view);
        requestLayout();
        invalidate();
        attachViewToParent(view, index, view.getLayoutParams());
    }
 
    public void setLayoutParams(final View childView,
                                final ViewGroup.LayoutParams params,
                                final boolean forceRedraw)
    {
        // Invalid view
        if (childView == null)
            return;
 
        // Invalid params
        if (!checkLayoutParams(params))
            return;
 
        // View is already in the layout and can therefore be updated
        final boolean canUpdate = (this == childView.getParent());
 
        if (canUpdate) {
            childView.setLayoutParams(params);
            if (forceRedraw)
                invalidate();
        } else {
            addView(childView, params);
        }
    }
}