Java tutorial
/* * Copyright (C) 2015 The Android Open Source Project * * 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 android.support.design.internal; import android.content.Context; import android.content.res.ColorStateList; import android.graphics.Color; import android.graphics.drawable.ColorDrawable; import android.graphics.drawable.Drawable; import android.graphics.drawable.StateListDrawable; import android.support.annotation.RestrictTo; import android.support.design.R; import android.support.v4.content.res.ResourcesCompat; import android.support.v4.graphics.drawable.DrawableCompat; import android.support.v4.view.AccessibilityDelegateCompat; import android.support.v4.view.ViewCompat; import android.support.v4.view.accessibility.AccessibilityEventCompat; import android.support.v4.view.accessibility.AccessibilityNodeInfoCompat; import android.support.v4.widget.TextViewCompat; import android.support.v7.view.menu.MenuItemImpl; import android.support.v7.view.menu.MenuView; import android.support.v7.widget.LinearLayoutCompat; import android.util.AttributeSet; import android.util.TypedValue; import android.view.LayoutInflater; import android.view.View; import android.view.ViewStub; import android.widget.CheckedTextView; import android.widget.FrameLayout; import static android.support.annotation.RestrictTo.Scope.LIBRARY_GROUP; /** * @hide */ @RestrictTo(LIBRARY_GROUP) public class NavigationMenuItemView extends ForegroundLinearLayout implements MenuView.ItemView { private static final int[] CHECKED_STATE_SET = { android.R.attr.state_checked }; private final int mIconSize; private boolean mNeedsEmptyIcon; boolean mCheckable; private final CheckedTextView mTextView; private FrameLayout mActionArea; private MenuItemImpl mItemData; private ColorStateList mIconTintList; private boolean mHasIconTintList; private Drawable mEmptyDrawable; private final AccessibilityDelegateCompat mAccessibilityDelegate = new AccessibilityDelegateCompat() { @Override public void onInitializeAccessibilityNodeInfo(View host, AccessibilityNodeInfoCompat info) { super.onInitializeAccessibilityNodeInfo(host, info); info.setCheckable(mCheckable); } }; public NavigationMenuItemView(Context context) { this(context, null); } public NavigationMenuItemView(Context context, AttributeSet attrs) { this(context, attrs, 0); } public NavigationMenuItemView(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); setOrientation(HORIZONTAL); LayoutInflater.from(context).inflate(R.layout.design_navigation_menu_item, this, true); mIconSize = context.getResources().getDimensionPixelSize(R.dimen.design_navigation_icon_size); mTextView = (CheckedTextView) findViewById(R.id.design_menu_item_text); mTextView.setDuplicateParentStateEnabled(true); ViewCompat.setAccessibilityDelegate(mTextView, mAccessibilityDelegate); } @Override public void initialize(MenuItemImpl itemData, int menuType) { mItemData = itemData; setVisibility(itemData.isVisible() ? VISIBLE : GONE); if (getBackground() == null) { ViewCompat.setBackground(this, createDefaultBackground()); } setCheckable(itemData.isCheckable()); setChecked(itemData.isChecked()); setEnabled(itemData.isEnabled()); setTitle(itemData.getTitle()); setIcon(itemData.getIcon()); setActionView(itemData.getActionView()); adjustAppearance(); } private boolean shouldExpandActionArea() { return mItemData.getTitle() == null && mItemData.getIcon() == null && mItemData.getActionView() != null; } private void adjustAppearance() { if (shouldExpandActionArea()) { // Expand the actionView area mTextView.setVisibility(View.GONE); if (mActionArea != null) { LinearLayoutCompat.LayoutParams params = (LinearLayoutCompat.LayoutParams) mActionArea .getLayoutParams(); params.width = LinearLayoutCompat.LayoutParams.MATCH_PARENT; mActionArea.setLayoutParams(params); } } else { mTextView.setVisibility(View.VISIBLE); if (mActionArea != null) { LinearLayoutCompat.LayoutParams params = (LinearLayoutCompat.LayoutParams) mActionArea .getLayoutParams(); params.width = LinearLayoutCompat.LayoutParams.WRAP_CONTENT; mActionArea.setLayoutParams(params); } } } public void recycle() { if (mActionArea != null) { mActionArea.removeAllViews(); } mTextView.setCompoundDrawables(null, null, null, null); } private void setActionView(View actionView) { if (actionView != null) { if (mActionArea == null) { mActionArea = (FrameLayout) ((ViewStub) findViewById(R.id.design_menu_item_action_area_stub)) .inflate(); } mActionArea.removeAllViews(); mActionArea.addView(actionView); } } private StateListDrawable createDefaultBackground() { TypedValue value = new TypedValue(); if (getContext().getTheme().resolveAttribute(android.support.v7.appcompat.R.attr.colorControlHighlight, value, true)) { StateListDrawable drawable = new StateListDrawable(); drawable.addState(CHECKED_STATE_SET, new ColorDrawable(value.data)); drawable.addState(EMPTY_STATE_SET, new ColorDrawable(Color.TRANSPARENT)); return drawable; } return null; } @Override public MenuItemImpl getItemData() { return mItemData; } @Override public void setTitle(CharSequence title) { mTextView.setText(title); } @Override public void setCheckable(boolean checkable) { refreshDrawableState(); if (mCheckable != checkable) { mCheckable = checkable; mAccessibilityDelegate.sendAccessibilityEvent(mTextView, AccessibilityEventCompat.TYPE_WINDOW_CONTENT_CHANGED); } } @Override public void setChecked(boolean checked) { refreshDrawableState(); mTextView.setChecked(checked); } @Override public void setShortcut(boolean showShortcut, char shortcutKey) { } @Override public void setIcon(Drawable icon) { if (icon != null) { if (mHasIconTintList) { Drawable.ConstantState state = icon.getConstantState(); icon = DrawableCompat.wrap(state == null ? icon : state.newDrawable()).mutate(); DrawableCompat.setTintList(icon, mIconTintList); } icon.setBounds(0, 0, mIconSize, mIconSize); } else if (mNeedsEmptyIcon) { if (mEmptyDrawable == null) { mEmptyDrawable = ResourcesCompat.getDrawable(getResources(), R.drawable.navigation_empty_icon, getContext().getTheme()); if (mEmptyDrawable != null) { mEmptyDrawable.setBounds(0, 0, mIconSize, mIconSize); } } icon = mEmptyDrawable; } TextViewCompat.setCompoundDrawablesRelative(mTextView, icon, null, null, null); } @Override public boolean prefersCondensedTitle() { return false; } @Override public boolean showsIcon() { return true; } @Override protected int[] onCreateDrawableState(int extraSpace) { final int[] drawableState = super.onCreateDrawableState(extraSpace + 1); if (mItemData != null && mItemData.isCheckable() && mItemData.isChecked()) { mergeDrawableStates(drawableState, CHECKED_STATE_SET); } return drawableState; } void setIconTintList(ColorStateList tintList) { mIconTintList = tintList; mHasIconTintList = mIconTintList != null; if (mItemData != null) { // Update the icon so that the tint takes effect setIcon(mItemData.getIcon()); } } public void setTextAppearance(int textAppearance) { TextViewCompat.setTextAppearance(mTextView, textAppearance); } public void setTextColor(ColorStateList colors) { mTextView.setTextColor(colors); } public void setNeedsEmptyIcon(boolean needsEmptyIcon) { mNeedsEmptyIcon = needsEmptyIcon; } }