/* * Copyright (C) 2006 The Android Open Source Project * Modifications copyright (C) 2016 Yaroslav Pronin <[email protected]> * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package org.kore.kolabnotes.android.draweditor; import android.content.Context; import android.content.res.TypedArray; import androidx.annotation.IdRes; import android.util.AttributeSet; import android.view.View; import android.view.ViewGroup; import android.widget.LinearLayout; import org.kore.kolabnotes.android.R; import java.util.concurrent.atomic.AtomicInteger; /** * Created by yaroslav on 25.03.16. */ /** * This class is a complete copy RadioGroup except adaptation for ToolButton. */ public class ToolButtonGroup extends LinearLayout { // holds the checked id; the selection is empty by default private int mCheckedId = -1; // tracks children tool buttons checked state private ToolButton.OnCheckedChangeListener mChildOnCheckedChangeListener; // when true, mOnCheckedChangeListener discards events private boolean mProtectFromCheckedChange = false; private OnCheckedChangeListener mOnCheckedChangeListener; private PassThroughHierarchyChangeListener mPassThroughListener; private static final AtomicInteger sNextGeneratedId = new AtomicInteger(1); public ToolButtonGroup(Context context) { super(context); setOrientation(VERTICAL); init(); } public ToolButtonGroup(Context context, AttributeSet attrs) { super(context, attrs); // retrieve selected radio button as requested by the user in the // XML layout file TypedArray attributes = context.obtainStyledAttributes( attrs, R.styleable.ToolButtonGroup, android.R.attr.radioButtonStyle, 0); int value = attributes.getResourceId(R.styleable.ToolButtonGroup_checkedButton, View.NO_ID); if (value != View.NO_ID) { mCheckedId = value; } setOrientation(LinearLayout.HORIZONTAL); attributes.recycle(); init(); } private void init() { mChildOnCheckedChangeListener = new CheckedStateTracker(); mPassThroughListener = new PassThroughHierarchyChangeListener(); super.setOnHierarchyChangeListener(mPassThroughListener); } @Override public void setOnHierarchyChangeListener(OnHierarchyChangeListener listener) { // the user listener is delegated to our pass-through listener mPassThroughListener.mOnHierarchyChangeListener = listener; } @Override protected void onFinishInflate() { super.onFinishInflate(); // checks the appropriate radio button as requested in the XML file if (mCheckedId != -1) { mProtectFromCheckedChange = true; setCheckedStateForView(mCheckedId, true); mProtectFromCheckedChange = false; setCheckedId(mCheckedId); } } @Override public void addView(View child, int index, ViewGroup.LayoutParams params) { if (child instanceof ToolButton) { final ToolButton button = (ToolButton) child; if (button.isChecked()) { mProtectFromCheckedChange = true; if (mCheckedId != -1) { setCheckedStateForView(mCheckedId, false); } mProtectFromCheckedChange = false; setCheckedId(button.getId()); } } super.addView(child, index, params); } /** * <p>Sets the selection to the tool button whose identifier is passed in * parameter. Using -1 as the selection identifier clears the selection; * such an operation is equivalent to invoking {@link #clearCheck()}.</p> * * @param id the unique id of the tool button to select in this group * * @see #getCheckedToolButtonId() * @see #clearCheck() */ public void check(@IdRes int id) { // don't even bother if (id != -1 && (id == mCheckedId)) { return; } if (mCheckedId != -1) { setCheckedStateForView(mCheckedId, false); } if (id != -1) { setCheckedStateForView(id, true); } setCheckedId(id); } private void setCheckedId(@IdRes int id) { mCheckedId = id; if (mOnCheckedChangeListener != null) { mOnCheckedChangeListener.onCheckedChanged(this, mCheckedId); } } private void setCheckedStateForView(int viewId, boolean checked) { View checkedView = findViewById(viewId); if (checkedView != null && checkedView instanceof ToolButton) { ((ToolButton) checkedView).setChecked(checked); } } /** * <p>Returns the identifier of the selected tool button in this group. * Upon empty selection, the returned value is -1.</p> * * @return the unique id of the selected tool button in this group * * @see #check(int) * @see #clearCheck() * * @attr ref R.styleable#ToolGroup_checkedButton */ @IdRes public int getCheckedToolButtonId() { return mCheckedId; } /** * <p>Clears the selection. When the selection is cleared, no tool button * in this group is selected and {@link #getCheckedToolButtonId()} returns * null.</p> * * @see #check(int) * @see #getCheckedToolButtonId() */ public void clearCheck() { check(-1); } /** * <p>Register a callback to be invoked when the checked tool button * changes in this group.</p> * * @param listener the callback to call on checked state change */ public void setOnCheckedChangeListener(OnCheckedChangeListener listener) { mOnCheckedChangeListener = listener; } @Override public LayoutParams generateLayoutParams(AttributeSet attrs) { return new ToolButtonGroup.LayoutParams(getContext(), attrs); } @Override protected boolean checkLayoutParams(ViewGroup.LayoutParams p) { return p instanceof ToolButtonGroup.LayoutParams; } @Override protected LinearLayout.LayoutParams generateDefaultLayoutParams() { return new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT); } @Override public CharSequence getAccessibilityClassName() { return ToolButtonGroup.class.getName(); } /** * <p>This set of layout parameters defaults the width and the height of * the children to {@link #WRAP_CONTENT} when they are not specified in the * XML file. Otherwise, this class ussed the value read from the XML file.</p> * * <p>See * {@link com.android.internal.R.styleable#LinearLayout_Layout LinearLayout Attributes} * for a list of all child view attributes that this class supports.</p> * */ public static class LayoutParams extends LinearLayout.LayoutParams { public LayoutParams(Context c, AttributeSet attrs) { super(c, attrs); } public LayoutParams(int w, int h) { super(w, h); } public LayoutParams(int w, int h, float initWeight) { super(w, h, initWeight); } public LayoutParams(ViewGroup.LayoutParams p) { super(p); } public LayoutParams(MarginLayoutParams source) { super(source); } /** * <p>Fixes the child's width to * {@link android.view.ViewGroup.LayoutParams#WRAP_CONTENT} and the child's * height to {@link android.view.ViewGroup.LayoutParams#WRAP_CONTENT} * when not specified in the XML file.</p> * * @param a the styled attributes set * @param widthAttr the width attribute to fetch * @param heightAttr the height attribute to fetch */ @Override protected void setBaseAttributes(TypedArray a, int widthAttr, int heightAttr) { if (a.hasValue(widthAttr)) { width = a.getLayoutDimension(widthAttr, "layout_width"); } else { width = WRAP_CONTENT; } if (a.hasValue(heightAttr)) { height = a.getLayoutDimension(heightAttr, "layout_height"); } else { height = WRAP_CONTENT; } } } /** * <p>Interface definition for a callback to be invoked when the checked * tool button changed in this group.</p> */ public interface OnCheckedChangeListener { /** * <p>Called when the checked tool button has changed. When the * selection is cleared, checkedId is -1.</p> * * @param group the group in which the checked tool button has changed * @param checkedId the unique identifier of the newly checked tool button */ public void onCheckedChanged(ToolButtonGroup group, @IdRes int checkedId); } /** * Portable version View.generateViewId() (for API 16) */ public static int generateViewId() { for (;;) { final int result = sNextGeneratedId.get(); // aapt-generated IDs have the high byte nonzero; clamp to the range under that. int newValue = result + 1; if (newValue > 0x00FFFFFF) newValue = 1; // Roll over to 1, not 0. if (sNextGeneratedId.compareAndSet(result, newValue)) { return result; } } } private class CheckedStateTracker implements ToolButton.OnCheckedChangeListener { public void onCheckedChanged(ToolButton buttonView, boolean isChecked) { // prevents from infinite recursion if (mProtectFromCheckedChange) { return; } mProtectFromCheckedChange = true; if (mCheckedId != -1) { setCheckedStateForView(mCheckedId, false); } mProtectFromCheckedChange = false; int id = buttonView.getId(); setCheckedId(id); } } /** * <p>A pass-through listener acts upon the events and dispatches them * to another listener. This allows the table layout to set its own internal * hierarchy change listener without preventing the user to setup his.</p> */ private class PassThroughHierarchyChangeListener implements ViewGroup.OnHierarchyChangeListener { private ViewGroup.OnHierarchyChangeListener mOnHierarchyChangeListener; public void onChildViewAdded(View parent, View child) { if (parent == ToolButtonGroup.this && child instanceof ToolButton) { int id = child.getId(); // generates an id if it's missing if (id == View.NO_ID) { id = generateViewId(); child.setId(id); } ((ToolButton) child).setOnCheckedChangeListener( mChildOnCheckedChangeListener); } if (mOnHierarchyChangeListener != null) { mOnHierarchyChangeListener.onChildViewAdded(parent, child); } } public void onChildViewRemoved(View parent, View child) { if (parent == ToolButtonGroup.this && child instanceof ToolButton) { ((ToolButton) child).setOnCheckedChangeListener(null); } if (mOnHierarchyChangeListener != null) { mOnHierarchyChangeListener.onChildViewRemoved(parent, child); } } } }