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// Copyright (C) 2016 Olivier Goffart <ogoffart@woboq.com>
// 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.annotation.SuppressLint;
import android.app.Activity;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.drawable.Drawable;
import android.util.DisplayMetrics;
import android.util.Log;
import android.util.TypedValue;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewTreeObserver;
import android.widget.ImageView;
import android.widget.PopupWindow;
/* This view represents one of the handle (selection or cursor handle) */
@SuppressLint("ViewConstructor")
class CursorView extends ImageView
{
private final CursorHandle mHandle;
// The coordinate which where clicked
private float m_offsetX;
private float m_offsetY;
private boolean m_pressed = false;
CursorView (Context context, CursorHandle handle) {
super(context);
mHandle = handle;
}
// Called when the handle was moved programmatically , with the delta amount in pixels
public void adjusted(int dx, int dy) {
m_offsetX += dx;
m_offsetY += dy;
}
@Override
public boolean onTouchEvent(MotionEvent ev) {
switch (ev.getActionMasked()) {
case MotionEvent.ACTION_DOWN: {
m_offsetX = ev.getRawX();
m_offsetY = ev.getRawY() + (float) getHeight() / 2;
m_pressed = true;
break;
}
case MotionEvent.ACTION_MOVE: {
if (!m_pressed)
return false;
mHandle.updatePosition(Math.round(ev.getRawX() - m_offsetX),
Math.round(ev.getRawY() - m_offsetY));
break;
}
case MotionEvent.ACTION_UP:
case MotionEvent.ACTION_CANCEL:
m_pressed = false;
break;
}
return true;
}
}
// Helper class that manages a cursor or selection handle
class CursorHandle implements ViewTreeObserver.OnPreDrawListener
{
private static final String QtTag = "QtCursorHandle";
private final View m_layout;
private CursorView m_cursorView = null;
private PopupWindow m_popup = null;
private final int m_id;
private final int m_attr;
private final Activity m_activity;
private int m_posX = 0;
private int m_posY = 0;
private int m_lastX;
private int m_lastY;
int tolerance;
private final boolean m_rtl;
int m_yShift;
public CursorHandle(Activity activity, View layout, int id, int attr, boolean rtl) {
m_activity = activity;
m_id = id;
m_attr = attr;
m_layout = layout;
DisplayMetrics metrics = activity.getResources().getDisplayMetrics();
m_yShift = (int)TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_MM, 1f, metrics);
tolerance = Math.min(1, (int)(m_yShift / 2f));
m_lastX = m_lastY = -1 - tolerance;
m_rtl = rtl;
}
private void initOverlay(){
if (m_popup != null)
return;
Context context = m_layout.getContext();
int[] attrs = {m_attr};
TypedArray a = context.getTheme().obtainStyledAttributes(attrs);
Drawable drawable = a.getDrawable(0);
m_cursorView = new CursorView(context, this);
m_cursorView.setImageDrawable(drawable);
m_popup = new PopupWindow(context, null, android.R.attr.textSelectHandleWindowStyle);
m_popup.setSplitTouchEnabled(true);
m_popup.setClippingEnabled(false);
m_popup.setContentView(m_cursorView);
if (drawable != null) {
m_popup.setWidth(drawable.getIntrinsicWidth());
m_popup.setHeight(drawable.getIntrinsicHeight());
} else {
Log.w(QtTag, "initOverlay(): cannot get width/height for popup " +
"from null drawable for attribute " + m_attr);
}
m_layout.getViewTreeObserver().addOnPreDrawListener(this);
}
// Show the handle at a given position (or move it if it is already shown)
public void setPosition(final int x, final int y){
initOverlay();
final int[] layoutLocation = new int[2];
m_layout.getLocationOnScreen(layoutLocation);
// These values are used for handling split screen case
final int[] activityLocation = new int[2];
final int[] activityLocationInWindow = new int[2];
m_activity.getWindow().getDecorView().getLocationOnScreen(activityLocation);
m_activity.getWindow().getDecorView().getLocationInWindow(activityLocationInWindow);
int x2 = x + layoutLocation[0] - activityLocation[0];
int y2 = y + layoutLocation[1] + m_yShift + (activityLocationInWindow[1] - activityLocation[1]);
if (m_id == QtInputDelegate.IdCursorHandle) {
x2 -= m_popup.getWidth() / 2 ;
} else if ((m_id == QtInputDelegate.IdLeftHandle && !m_rtl) || (m_id == QtInputDelegate.IdRightHandle && m_rtl)) {
x2 -= m_popup.getWidth() * 3 / 4;
} else {
x2 -= m_popup.getWidth() / 4;
}
if (m_popup.isShowing()) {
m_popup.update(x2, y2, -1, -1);
m_cursorView.adjusted(x - m_posX, y - m_posY);
} else {
m_popup.showAtLocation(m_layout, 0, x2, y2);
}
m_posX = x;
m_posY = y;
}
public int bottom()
{
initOverlay();
final int[] location = new int[2];
m_cursorView.getLocationOnScreen(location);
return location[1] + m_cursorView.getHeight();
}
public void hide() {
if (m_popup != null) {
m_popup.dismiss();
}
}
public int width()
{
return m_cursorView.getDrawable().getIntrinsicWidth();
}
// The handle was dragged by a given relative position
public void updatePosition(int x, int y) {
y -= m_yShift;
if (Math.abs(m_lastX - x) > tolerance || Math.abs(m_lastY - y) > tolerance) {
QtInputDelegate.handleLocationChanged(m_id, x + m_posX, y + m_posY);
m_lastX = x;
m_lastY = y;
}
}
@Override
public boolean onPreDraw() {
// This hook is called when the view location is changed
// For example if the keyboard appears.
// Adjust the position of the handle accordingly
if (m_popup != null && m_popup.isShowing())
setPosition(m_posX, m_posY);
return true;
}
}
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