mirror of https://codeberg.org/tom79/Fedilab
Fix issue #225 - Set Focus on images
Thomas
2 years ago
parent
6219c010d0
commit
965676484a
@ -0,0 +1,249 @@
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package app.fedilab.android.helper;
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import android.content.Context;
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import android.graphics.Canvas;
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import android.graphics.Paint;
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import android.graphics.Rect;
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import android.util.AttributeSet;
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import android.util.SparseArray;
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import android.view.MotionEvent;
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import android.view.View;
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import androidx.core.content.res.ResourcesCompat;
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import java.util.HashSet;
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import java.util.Random;
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import app.fedilab.android.R;
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//Original work at https://stackoverflow.com/a/17830245
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public class CirclesDrawingView extends View {
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// Radius limit in pixels
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private final static int RADIUS_LIMIT = 100;
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private static final int CIRCLES_LIMIT = 1;
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private final Random mRadiusGenerator = new Random();
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/**
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* All available circles
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*/
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private final HashSet<CircleArea> mCircles = new HashSet<>(CIRCLES_LIMIT);
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private final SparseArray<CircleArea> mCirclePointer = new SparseArray<>(CIRCLES_LIMIT);
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/**
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* Paint to draw circles
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*/
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private Paint mCirclePaint;
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private CircleArea touchedCircle;
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/**
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* Default constructor
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*
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* @param ct {@link android.content.Context}
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*/
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public CirclesDrawingView(final Context ct) {
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super(ct);
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init(ct);
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}
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public CirclesDrawingView(final Context ct, final AttributeSet attrs) {
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super(ct, attrs);
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init(ct);
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}
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public CirclesDrawingView(final Context ct, final AttributeSet attrs, final int defStyle) {
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super(ct, attrs, defStyle);
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init(ct);
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}
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public CircleArea getTouchedCircle() {
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return this.touchedCircle;
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}
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private void init(final Context ct) {
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// Generate bitmap used for background
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mCirclePaint = new Paint();
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mCirclePaint.setColor(ResourcesCompat.getColor(getContext().getResources(), R.color.cyanea_accent, getContext().getTheme()));
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mCirclePaint.setStrokeWidth(10);
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mCirclePaint.setStyle(Paint.Style.STROKE);
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}
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@Override
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public void onDraw(final Canvas canv) {
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// background bitmap to cover all area
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for (CircleArea circle : mCircles) {
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canv.drawCircle(circle.centerX, circle.centerY, circle.radius, mCirclePaint);
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}
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}
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@Override
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public boolean onTouchEvent(final MotionEvent event) {
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boolean handled = false;
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int xTouch;
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int yTouch;
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int pointerId;
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int actionIndex = event.getActionIndex();
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// get touch event coordinates and make transparent circle from it
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switch (event.getActionMasked()) {
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case MotionEvent.ACTION_DOWN:
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// it's the first pointer, so clear all existing pointers data
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clearCirclePointer();
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xTouch = (int) event.getX(0);
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yTouch = (int) event.getY(0);
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// check if we've touched inside some circle
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touchedCircle = obtainTouchedCircle(xTouch, yTouch);
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touchedCircle.centerX = xTouch;
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touchedCircle.centerY = yTouch;
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mCirclePointer.put(event.getPointerId(0), touchedCircle);
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invalidate();
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handled = true;
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break;
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case MotionEvent.ACTION_POINTER_DOWN:
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// It secondary pointers, so obtain their ids and check circles
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pointerId = event.getPointerId(actionIndex);
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xTouch = (int) event.getX(actionIndex);
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yTouch = (int) event.getY(actionIndex);
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// check if we've touched inside some circle
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touchedCircle = obtainTouchedCircle(xTouch, yTouch);
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mCirclePointer.put(pointerId, touchedCircle);
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touchedCircle.centerX = xTouch;
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touchedCircle.centerY = yTouch;
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invalidate();
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handled = true;
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break;
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case MotionEvent.ACTION_MOVE:
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final int pointerCount = event.getPointerCount();
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for (actionIndex = 0; actionIndex < pointerCount; actionIndex++) {
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// Some pointer has moved, search it by pointer id
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pointerId = event.getPointerId(actionIndex);
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xTouch = (int) event.getX(actionIndex);
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yTouch = (int) event.getY(actionIndex);
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touchedCircle = mCirclePointer.get(pointerId);
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if (null != touchedCircle) {
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touchedCircle.centerX = xTouch;
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touchedCircle.centerY = yTouch;
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}
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}
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invalidate();
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handled = true;
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break;
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case MotionEvent.ACTION_UP:
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clearCirclePointer();
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invalidate();
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handled = true;
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break;
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case MotionEvent.ACTION_POINTER_UP:
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// not general pointer was up
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pointerId = event.getPointerId(actionIndex);
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mCirclePointer.remove(pointerId);
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invalidate();
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handled = true;
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break;
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case MotionEvent.ACTION_CANCEL:
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handled = true;
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break;
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default:
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// do nothing
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break;
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}
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return super.onTouchEvent(event) || handled;
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}
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/**
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* Clears all CircleArea - pointer id relations
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*/
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private void clearCirclePointer() {
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mCirclePointer.clear();
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}
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/**
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* Search and creates new (if needed) circle based on touch area
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*
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* @param xTouch int x of touch
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* @param yTouch int y of touch
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* @return obtained {@link CircleArea}
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*/
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private CircleArea obtainTouchedCircle(final int xTouch, final int yTouch) {
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CircleArea touchedCircle = getTouchedCircle(xTouch, yTouch);
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if (null == touchedCircle) {
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touchedCircle = new CircleArea(xTouch, yTouch, mRadiusGenerator.nextInt(RADIUS_LIMIT) + RADIUS_LIMIT);
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if (mCircles.size() == CIRCLES_LIMIT) {
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// remove first circle
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mCircles.clear();
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}
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mCircles.add(touchedCircle);
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}
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return touchedCircle;
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}
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/**
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* Determines touched circle
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*
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* @param xTouch int x touch coordinate
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* @param yTouch int y touch coordinate
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* @return {@link CircleArea} touched circle or null if no circle has been touched
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*/
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private CircleArea getTouchedCircle(final int xTouch, final int yTouch) {
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CircleArea touched = null;
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for (CircleArea circle : mCircles) {
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if ((circle.centerX - xTouch) * (circle.centerX - xTouch) + (circle.centerY - yTouch) * (circle.centerY - yTouch) <= circle.radius * circle.radius) {
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touched = circle;
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break;
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}
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}
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return touched;
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}
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@Override
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protected void onMeasure(final int widthMeasureSpec, final int heightMeasureSpec) {
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super.onMeasure(widthMeasureSpec, heightMeasureSpec);
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new Rect(0, 0, getMeasuredWidth(), getMeasuredHeight());
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}
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/**
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* Stores data about single circle
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*/
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public static class CircleArea {
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public int centerX;
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public int centerY;
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int radius;
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CircleArea(int centerX, int centerY, int radius) {
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this.radius = radius;
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this.centerX = centerX;
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this.centerY = centerY;
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}
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@Override
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public String toString() {
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return "Circle[" + centerX + ", " + centerY + ", " + radius + "]";
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}
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}
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}
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@ -0,0 +1,10 @@
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<vector xmlns:android="http://schemas.android.com/apk/res/android"
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android:width="24dp"
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android:height="24dp"
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android:tint="#FFFFFF"
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android:viewportWidth="24"
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android:viewportHeight="24">
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<path
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android:fillColor="@android:color/white"
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android:pathData="M5,15L3,15v4c0,1.1 0.9,2 2,2h4v-2L5,19v-4zM5,5h4L9,3L5,3c-1.1,0 -2,0.9 -2,2v4h2L5,5zM19,3h-4v2h4v4h2L21,5c0,-1.1 -0.9,-2 -2,-2zM19,19h-4v2h4c1.1,0 2,-0.9 2,-2v-4h-2v4zM12,9c-1.66,0 -3,1.34 -3,3s1.34,3 3,3 3,-1.34 3,-3 -1.34,-3 -3,-3z" />
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</vector>
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