ZoomControls.java

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package com.navigine.view.widgets;
 
import android.content.Context;
import android.graphics.Color;
import android.graphics.drawable.ShapeDrawable;
import android.graphics.drawable.shapes.RoundRectShape;
import android.view.Gravity;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.FrameLayout;
import android.widget.LinearLayout;
 
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
 
import com.navigine.view.widgets.ZoomControlsConfig;

public class ZoomControls extends FrameLayout {

    public interface OnZoomInListener {
        void onZoomIn();
    }

    public interface OnZoomOutListener {
        void onZoomOut();
    }
 
    private OnZoomInListener onZoomInListener;
    private OnZoomOutListener onZoomOutListener;
    private ZoomControlsConfig config;

    public ZoomControls(@NonNull Context context, OnZoomInListener onZoomIn, OnZoomOutListener onZoomOut) {
        this(context, onZoomIn, onZoomOut, null);
    }

    public ZoomControls(@NonNull Context context, OnZoomInListener onZoomIn, OnZoomOutListener onZoomOut,
                       @Nullable ZoomControlsConfig config) {
        super(context);
        this.onZoomInListener = onZoomIn;
        this.onZoomOutListener = onZoomOut;
        this.config = config;
        setupUI();
    }
 
    private void setupUI() {
        ZoomControlsConfig c = config != null ? config : ZoomControlsConfig.defaultConfig();
        int textColor = c.getTextColor() != null ? c.getTextColor() : WidgetStyles.BASE_BLACK;
        int bgColor = c.getButtonBackgroundColor() != null ? c.getButtonBackgroundColor() : WidgetStyles.BUTTON_BACKGROUND_COLOR;
 
        Button zoomInButton = new Button(getContext(), null, android.R.attr.borderlessButtonStyle);
        if (c.getZoomInIcon() != null) {
            zoomInButton.setCompoundDrawablesWithIntrinsicBounds(null, c.getZoomInIcon(), null, null);
            zoomInButton.setText("");
        } else {
            zoomInButton.setText("+");
        }
        zoomInButton.setTextSize(WidgetStyles.BUTTON_FONT_SIZE);
        zoomInButton.setTextColor(textColor);
        zoomInButton.setBackground(createRoundedBackground(true, bgColor));
        zoomInButton.setPadding(0, 0, 0, 0);
        zoomInButton.setStateListAnimator(null);
 
        Button zoomOutButton = new Button(getContext(), null, android.R.attr.borderlessButtonStyle);
        if (c.getZoomOutIcon() != null) {
            zoomOutButton.setCompoundDrawablesWithIntrinsicBounds(null, c.getZoomOutIcon(), null, null);
            zoomOutButton.setText("");
        } else {
            zoomOutButton.setText("−");
        }
        zoomOutButton.setTextSize(WidgetStyles.BUTTON_FONT_SIZE);
        zoomOutButton.setTextColor(textColor);
        zoomOutButton.setBackground(createRoundedBackground(false, bgColor));
        zoomOutButton.setPadding(0, 0, 0, 0);
        zoomOutButton.setStateListAnimator(null);
 
        zoomInButton.setOnClickListener(v -> {
            if (onZoomInListener != null) {
                onZoomInListener.onZoomIn();
            }
        });
        zoomOutButton.setOnClickListener(v -> {
            if (onZoomOutListener != null) {
                onZoomOutListener.onZoomOut();
            }
        });
 
        LinearLayout stack = new LinearLayout(getContext());
        stack.setOrientation(LinearLayout.VERTICAL);
        stack.setBackgroundColor(Color.TRANSPARENT);
 
        stack.setElevation(dpToPx((int) WidgetStyles.SHADOW_ELEVATION));
        if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.P) {
            stack.setOutlineAmbientShadowColor(WidgetStyles.SHADOW_COLOR);
            stack.setOutlineSpotShadowColor(WidgetStyles.SHADOW_COLOR);
        }
 
        LinearLayout.LayoutParams btnLp = new LinearLayout.LayoutParams(
                ViewGroup.LayoutParams.MATCH_PARENT, 0, 1f);
        stack.addView(zoomInButton, btnLp);
        stack.addView(zoomOutButton, btnLp);
 
        FrameLayout.LayoutParams stackLp = new FrameLayout.LayoutParams(
                ViewGroup.LayoutParams.MATCH_PARENT,
                ViewGroup.LayoutParams.MATCH_PARENT
        );
        stack.setLayoutParams(stackLp);
 
        addView(stack);
    }
 
    private ShapeDrawable createRoundedBackground(boolean isTopButton) {
        return createRoundedBackground(isTopButton, WidgetStyles.BUTTON_BACKGROUND_COLOR);
    }
 
    private ShapeDrawable createRoundedBackground(boolean isTopButton, int color) {
        float radius = dpToPx((int) WidgetStyles.BORDER_RADIUS);
        float[] radii = isTopButton
                ? new float[]{radius, radius, radius, radius, 0, 0, 0, 0}
                : new float[]{0, 0, 0, 0, radius, radius, radius, radius};
 
        ShapeDrawable drawable = new ShapeDrawable(new RoundRectShape(radii, null, null));
        drawable.getPaint().setAntiAlias(true);
        drawable.getPaint().setColor(color);
        return drawable;
    }
 
    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        ZoomControlsConfig c = config != null ? config : ZoomControlsConfig.defaultConfig();
        float widthDp = c.getButtonWidth() > 0 ? c.getButtonWidth() : WidgetStyles.STANDARD_BUTTON_WIDTH;
        float heightDp = c.getZoomControlsHeight() > 0 ? c.getZoomControlsHeight() : WidgetStyles.ZOOM_CONTROLS_HEIGHT;
        int width = dpToPx((int) widthDp);
        int height = dpToPx((int) heightDp);
        int widthSpec = MeasureSpec.makeMeasureSpec(width, MeasureSpec.EXACTLY);
        int heightSpec = MeasureSpec.makeMeasureSpec(height, MeasureSpec.EXACTLY);
        super.onMeasure(widthSpec, heightSpec);
    }

    public void applyConfig(@Nullable ZoomControlsConfig newConfig) {
        config = newConfig;
        if (getChildCount() > 0) {
            View stack = getChildAt(0);
            if (stack instanceof android.widget.LinearLayout) {
                android.widget.LinearLayout linearLayout = (android.widget.LinearLayout) stack;
                if (linearLayout.getChildCount() >= 2) {
                    ZoomControlsConfig c = config != null ? config : ZoomControlsConfig.defaultConfig();
                    int textColor = c.getTextColor() != null ? c.getTextColor() : WidgetStyles.BASE_BLACK;
                    int bgColor = c.getButtonBackgroundColor() != null ? c.getButtonBackgroundColor() : WidgetStyles.BUTTON_BACKGROUND_COLOR;
                    View zoomIn = linearLayout.getChildAt(0);
                    View zoomOut = linearLayout.getChildAt(1);
                    if (zoomIn instanceof Button) {
                        Button btn = (Button) zoomIn;
                        btn.setTextColor(textColor);
                        btn.setBackground(createRoundedBackground(true, bgColor));
                        if (c.getZoomInIcon() != null) {
                            btn.setCompoundDrawablesWithIntrinsicBounds(null, c.getZoomInIcon(), null, null);
                            btn.setText("");
                        } else {
                            btn.setCompoundDrawablesWithIntrinsicBounds(null, null, null, null);
                            btn.setText("+");
                        }
                    }
                    if (zoomOut instanceof Button) {
                        Button btn = (Button) zoomOut;
                        btn.setTextColor(textColor);
                        btn.setBackground(createRoundedBackground(false, bgColor));
                        if (c.getZoomOutIcon() != null) {
                            btn.setCompoundDrawablesWithIntrinsicBounds(null, c.getZoomOutIcon(), null, null);
                            btn.setText("");
                        } else {
                            btn.setCompoundDrawablesWithIntrinsicBounds(null, null, null, null);
                            btn.setText("−");
                        }
                    }
                }
            }
        }
    }
 
    private int dpToPx(int dp) {
        return (int) (dp * getResources().getDisplayMetrics().density + 0.5f);
    }
}