FloatingToolbar.java

/*
   Floating toolbar for RDP session controls
 
   Copyright 2026 Ibrahim Sevinc <ibrahim.sevinc.mail@gmail.com>
 
   This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0.
   If a copy of the MPL was not distributed with this file, You can obtain one at
   http://mozilla.org/MPL/2.0/.
*/
 
package com.freerdp.freerdpcore.presentation;
 
import android.app.Activity;
import android.view.GestureDetector;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewTreeObserver;
import android.widget.LinearLayout;
 
import com.freerdp.freerdpcore.R;
 
public class FloatingToolbar
{
  public interface Listener
  {
    void onToggleTouchPointer();
    void onToggleSysKeyboard();
    void onToggleExtKeyboard();
  }
 
  private enum Edge
  {
    LEFT,
    RIGHT,
    TOP,
    BOTTOM
  }
 
  private final LinearLayout container;
  private final LinearLayout buttons;
  private boolean expanded = false;
  private int insetLeft = 0, insetTop = 0, insetRight = 0, insetBottom = 0;
  private Edge snappedEdge = Edge.LEFT;
  private float snappedFraction = 0.4f;
 
  public void setInsets(int left, int top, int right, int bottom)
  {
    insetLeft = left;
    insetTop = top;
    insetRight = right;
    insetBottom = bottom;
  }
 
  public FloatingToolbar(Activity activity, Listener listener)
  {
    container = activity.findViewById(R.id.floating_toolbar_container);
    buttons = activity.findViewById(R.id.floating_toolbar_buttons);
    View handle = activity.findViewById(R.id.floating_toolbar_handle);
    setTooltip(handle);
 
    GestureDetector gestureDetector =
        new GestureDetector(activity, new GestureDetector.SimpleOnGestureListener() {
          @Override public boolean onSingleTapConfirmed(MotionEvent e)
          {
            toggle();
            return true;
          }
        });
 
    View.OnTouchListener dragListener = buildDragListener(activity, gestureDetector, handle);
    container.setOnTouchListener(dragListener);
    handle.setOnTouchListener(dragListener);
    for (int i = 0; i < buttons.getChildCount(); i++)
      buttons.getChildAt(i).setOnTouchListener(dragListener);
 
    bindButton(activity, R.id.floating_toolbar_touch_pointer, listener::onToggleTouchPointer);
    bindButton(activity, R.id.floating_toolbar_sys_keyboard, listener::onToggleSysKeyboard);
    bindButton(activity, R.id.floating_toolbar_ext_keyboard, listener::onToggleExtKeyboard);
 
    ViewTreeObserver vto = container.getViewTreeObserver();
    vto.addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
      @Override public void onGlobalLayout()
      {
        container.getViewTreeObserver().removeOnGlobalLayoutListener(this);
        View parent = (View)container.getParent();
        if (parent == null)
          return;
        positionInitial(parent);
        parent.addOnLayoutChangeListener((v, left, top, right, bottom, oldLeft, oldTop,
                                          oldRight, oldBottom) -> {
          if (right - left != oldRight - oldLeft || bottom - top != oldBottom - oldTop)
            resnapToSameEdge();
        });
      }
    });
  }
 
  private void positionInitial(View parent)
  {
    container.setOrientation(LinearLayout.VERTICAL);
    buttons.setOrientation(LinearLayout.VERTICAL);
    snappedEdge = Edge.LEFT;
    snappedFraction = 0.4f;
    float ph = parent.getHeight();
    float ch = container.getHeight();
    container.setX(insetLeft);
    container.setY(
        Math.max(insetTop, insetTop + snappedFraction * (ph - insetTop - insetBottom - ch)));
  }
 
  private void resnapToSameEdge()
  {
    View parent = (View)container.getParent();
    if (parent == null)
      return;
 
    int orientation = (snappedEdge == Edge.LEFT || snappedEdge == Edge.RIGHT)
                          ? LinearLayout.VERTICAL
                          : LinearLayout.HORIZONTAL;
    container.setOrientation(orientation);
    buttons.setOrientation(orientation);
 
    container.post(() -> {
      float pw = parent.getWidth(), ph = parent.getHeight();
      float w = container.getWidth(), h = container.getHeight();
      float tx, ty;
      switch (snappedEdge)
      {
        case LEFT:
          tx = insetLeft;
          ty = insetTop + snappedFraction * (ph - insetTop - insetBottom - h);
          break;
        case RIGHT:
          tx = pw - w - insetRight;
          ty = insetTop + snappedFraction * (ph - insetTop - insetBottom - h);
          break;
        case TOP:
          tx = insetLeft + snappedFraction * (pw - insetLeft - insetRight - w);
          ty = insetTop;
          break;
        default:
          tx = insetLeft + snappedFraction * (pw - insetLeft - insetRight - w);
          ty = ph - h - insetBottom;
          break;
      }
      tx = Math.max(insetLeft, Math.min(tx, pw - w - insetRight));
      ty = Math.max(insetTop, Math.min(ty, ph - h - insetBottom));
      container.animate().x(tx).y(ty).setDuration(250).start();
    });
  }
 
  private void toggle()
  {
    expanded = !expanded;
    buttons.setVisibility(expanded ? View.VISIBLE : View.GONE);
    snap();
  }
 
  private void bindButton(Activity activity, int id, Runnable action)
  {
    View v = activity.findViewById(id);
    if (v != null)
    {
      setTooltip(v);
      v.setOnClickListener(ignored -> action.run());
    }
  }
 
  private static void setTooltip(View v)
  {
    v.setTooltipText(v.getContentDescription());
  }
 
  private View.OnTouchListener buildDragListener(Activity activity,
                                                 GestureDetector gestureDetector, View handle)
  {
    int touchSlop = android.view.ViewConfiguration.get(activity).getScaledTouchSlop();
    return new View.OnTouchListener() {
      private float startX, startY, offsetX, offsetY;
      private boolean dragging;
 
      @Override public boolean onTouch(View v, MotionEvent e)
      {
        if (v == handle || v == container)
          gestureDetector.onTouchEvent(e);
 
        switch (e.getActionMasked())
        {
          case MotionEvent.ACTION_DOWN:
            startX = e.getRawX();
            startY = e.getRawY();
            offsetX = container.getX() - startX;
            offsetY = container.getY() - startY;
            dragging = false;
            v.onTouchEvent(e);
            break;
          case MotionEvent.ACTION_MOVE:
            if (!dragging && (Math.abs(e.getRawX() - startX) > touchSlop ||
                              Math.abs(e.getRawY() - startY) > touchSlop))
            {
              dragging = true;
              MotionEvent cancel = MotionEvent.obtain(e);
              cancel.setAction(MotionEvent.ACTION_CANCEL);
              v.onTouchEvent(cancel);
              cancel.recycle();
            }
            if (dragging)
              container.animate()
                  .x(e.getRawX() + offsetX)
                  .y(e.getRawY() + offsetY)
                  .setDuration(0)
                  .start();
            else
              v.onTouchEvent(e);
            break;
          case MotionEvent.ACTION_UP:
          case MotionEvent.ACTION_CANCEL:
            if (!dragging)
              v.onTouchEvent(e);
            snap();
            break;
        }
        return true;
      }
    };
  }
 
  private void snap()
  {
    View parent = (View)container.getParent();
    if (parent == null)
      return;
 
    float px = container.getX(), py = container.getY();
    float pw = parent.getWidth(), ph = parent.getHeight();
    float cw = container.getWidth(), ch = container.getHeight();
 
    float dLeft = px - insetLeft;
    float dRight = Math.max(0, pw - px - cw - insetRight);
    float dTop = py - insetTop;
    float dBottom = Math.max(0, ph - py - ch - insetBottom);
    float min = Math.min(Math.min(dLeft, dRight), Math.min(dTop, dBottom));
 
    if (min == dLeft)
      snappedEdge = Edge.LEFT;
    else if (min == dRight)
      snappedEdge = Edge.RIGHT;
    else if (min == dTop)
      snappedEdge = Edge.TOP;
    else
      snappedEdge = Edge.BOTTOM;
 
    int orientation = (snappedEdge == Edge.LEFT || snappedEdge == Edge.RIGHT)
                          ? LinearLayout.VERTICAL
                          : LinearLayout.HORIZONTAL;
    container.setOrientation(orientation);
    buttons.setOrientation(orientation);
 
    container.post(() -> {
      float w = container.getWidth(), h = container.getHeight();
      float tx = container.getX(), ty = container.getY();
      switch (snappedEdge)
      {
        case LEFT:
          tx = insetLeft;
          break;
        case RIGHT:
          tx = pw - w - insetRight;
          break;
        case TOP:
          ty = insetTop;
          break;
        case BOTTOM:
          ty = ph - h - insetBottom;
          break;
      }
      tx = Math.max(insetLeft, Math.min(tx, pw - w - insetRight));
      ty = Math.max(insetTop, Math.min(ty, ph - h - insetBottom));
      if (snappedEdge == Edge.LEFT || snappedEdge == Edge.RIGHT)
      {
        float available = ph - insetTop - insetBottom - h;
        snappedFraction =
            available > 0 ? Math.max(0f, Math.min(1f, (ty - insetTop) / available)) : 0.5f;
      }
      else
      {
        float available = pw - insetLeft - insetRight - w;
        snappedFraction =
            available > 0 ? Math.max(0f, Math.min(1f, (tx - insetLeft) / available)) : 0.5f;
      }
      container.animate().x(tx).y(ty).setDuration(250).start();
    });
  }
}