Java tutorial
/* * Copyright (C) 2014 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.v7.internal.app; import android.content.Context; import android.content.res.Configuration; import android.content.res.Resources; import android.graphics.drawable.Drawable; import android.support.annotation.Nullable; import android.support.v4.view.ViewCompat; import android.support.v4.view.WindowCompat; import android.support.v7.app.ActionBar; import android.support.v7.internal.view.WindowCallbackWrapper; import android.support.v7.appcompat.R; import android.support.v7.internal.view.menu.ListMenuPresenter; import android.support.v7.internal.view.menu.MenuBuilder; import android.support.v7.internal.view.menu.MenuPresenter; import android.support.v7.internal.widget.DecorToolbar; import android.support.v7.internal.widget.ToolbarWidgetWrapper; import android.support.v7.widget.Toolbar; import android.util.TypedValue; import android.view.ContextThemeWrapper; import android.view.KeyEvent; import android.view.LayoutInflater; import android.view.Menu; import android.view.MenuItem; import android.view.View; import android.view.Window; import android.widget.SpinnerAdapter; import java.util.ArrayList; /** * @hide */ public class ToolbarActionBar extends ActionBar { private DecorToolbar mDecorToolbar; private boolean mToolbarMenuPrepared; private Window.Callback mWindowCallback; private boolean mMenuCallbackSet; private boolean mLastMenuVisibility; private ArrayList<OnMenuVisibilityListener> mMenuVisibilityListeners = new ArrayList<OnMenuVisibilityListener>(); private Window mWindow; private ListMenuPresenter mListMenuPresenter; private final Runnable mMenuInvalidator = new Runnable() { @Override public void run() { populateOptionsMenu(); } }; private final Toolbar.OnMenuItemClickListener mMenuClicker = new Toolbar.OnMenuItemClickListener() { @Override public boolean onMenuItemClick(MenuItem item) { return mWindowCallback.onMenuItemSelected(Window.FEATURE_OPTIONS_PANEL, item); } }; public ToolbarActionBar(Toolbar toolbar, CharSequence title, Window window) { mDecorToolbar = new ToolbarWidgetWrapper(toolbar, false); mWindowCallback = new ToolbarCallbackWrapper(window.getCallback()); mDecorToolbar.setWindowCallback(mWindowCallback); toolbar.setOnMenuItemClickListener(mMenuClicker); mDecorToolbar.setWindowTitle(title); mWindow = window; } public Window.Callback getWrappedWindowCallback() { return mWindowCallback; } @Override public void setCustomView(View view) { setCustomView(view, new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT)); } @Override public void setCustomView(View view, LayoutParams layoutParams) { view.setLayoutParams(layoutParams); mDecorToolbar.setCustomView(view); } @Override public void setCustomView(int resId) { final LayoutInflater inflater = LayoutInflater.from(mDecorToolbar.getContext()); setCustomView(inflater.inflate(resId, mDecorToolbar.getViewGroup(), false)); } @Override public void setIcon(int resId) { mDecorToolbar.setIcon(resId); } @Override public void setIcon(Drawable icon) { mDecorToolbar.setIcon(icon); } @Override public void setLogo(int resId) { mDecorToolbar.setLogo(resId); } @Override public void setLogo(Drawable logo) { mDecorToolbar.setLogo(logo); } @Override public void setStackedBackgroundDrawable(Drawable d) { // This space for rent (do nothing) } @Override public void setSplitBackgroundDrawable(Drawable d) { // This space for rent (do nothing) } @Override public void setHomeButtonEnabled(boolean enabled) { // If the nav button on a Toolbar is present, it's enabled. No-op. } @Override public void setElevation(float elevation) { ViewCompat.setElevation(mDecorToolbar.getViewGroup(), elevation); } @Override public float getElevation() { return ViewCompat.getElevation(mDecorToolbar.getViewGroup()); } @Override public Context getThemedContext() { return mDecorToolbar.getContext(); } @Override public boolean isTitleTruncated() { return super.isTitleTruncated(); } @Override public void setHomeAsUpIndicator(Drawable indicator) { mDecorToolbar.setNavigationIcon(indicator); } @Override public void setHomeAsUpIndicator(int resId) { mDecorToolbar.setNavigationIcon(resId); } @Override public void setHomeActionContentDescription(CharSequence description) { mDecorToolbar.setNavigationContentDescription(description); } @Override public void setDefaultDisplayHomeAsUpEnabled(boolean enabled) { // Do nothing } @Override public void setHomeActionContentDescription(int resId) { mDecorToolbar.setNavigationContentDescription(resId); } @Override public void setShowHideAnimationEnabled(boolean enabled) { // This space for rent; no-op. } @Override public void onConfigurationChanged(Configuration config) { super.onConfigurationChanged(config); } @Override public void setListNavigationCallbacks(SpinnerAdapter adapter, OnNavigationListener callback) { mDecorToolbar.setDropdownParams(adapter, new NavItemSelectedListener(callback)); } @Override public void setSelectedNavigationItem(int position) { switch (mDecorToolbar.getNavigationMode()) { case NAVIGATION_MODE_LIST: mDecorToolbar.setDropdownSelectedPosition(position); break; default: throw new IllegalStateException("setSelectedNavigationIndex not valid for current navigation mode"); } } @Override public int getSelectedNavigationIndex() { return -1; } @Override public int getNavigationItemCount() { return 0; } @Override public void setTitle(CharSequence title) { mDecorToolbar.setTitle(title); } @Override public void setTitle(int resId) { mDecorToolbar.setTitle(resId != 0 ? mDecorToolbar.getContext().getText(resId) : null); } @Override public void setWindowTitle(CharSequence title) { mDecorToolbar.setWindowTitle(title); } @Override public void setSubtitle(CharSequence subtitle) { mDecorToolbar.setSubtitle(subtitle); } @Override public void setSubtitle(int resId) { mDecorToolbar.setSubtitle(resId != 0 ? mDecorToolbar.getContext().getText(resId) : null); } @Override public void setDisplayOptions(@DisplayOptions int options) { setDisplayOptions(options, 0xffffffff); } @Override public void setDisplayOptions(@DisplayOptions int options, @DisplayOptions int mask) { final int currentOptions = mDecorToolbar.getDisplayOptions(); mDecorToolbar.setDisplayOptions(options & mask | currentOptions & ~mask); } @Override public void setDisplayUseLogoEnabled(boolean useLogo) { setDisplayOptions(useLogo ? DISPLAY_USE_LOGO : 0, DISPLAY_USE_LOGO); } @Override public void setDisplayShowHomeEnabled(boolean showHome) { setDisplayOptions(showHome ? DISPLAY_SHOW_HOME : 0, DISPLAY_SHOW_HOME); } @Override public void setDisplayHomeAsUpEnabled(boolean showHomeAsUp) { setDisplayOptions(showHomeAsUp ? DISPLAY_HOME_AS_UP : 0, DISPLAY_HOME_AS_UP); } @Override public void setDisplayShowTitleEnabled(boolean showTitle) { setDisplayOptions(showTitle ? DISPLAY_SHOW_TITLE : 0, DISPLAY_SHOW_TITLE); } @Override public void setDisplayShowCustomEnabled(boolean showCustom) { setDisplayOptions(showCustom ? DISPLAY_SHOW_CUSTOM : 0, DISPLAY_SHOW_CUSTOM); } @Override public void setBackgroundDrawable(@Nullable Drawable d) { mDecorToolbar.setBackgroundDrawable(d); } @Override public View getCustomView() { return mDecorToolbar.getCustomView(); } @Override public CharSequence getTitle() { return mDecorToolbar.getTitle(); } @Override public CharSequence getSubtitle() { return mDecorToolbar.getSubtitle(); } @Override public int getNavigationMode() { return NAVIGATION_MODE_STANDARD; } @Override public void setNavigationMode(@NavigationMode int mode) { if (mode == ActionBar.NAVIGATION_MODE_TABS) { throw new IllegalArgumentException("Tabs not supported in this configuration"); } mDecorToolbar.setNavigationMode(mode); } @Override public int getDisplayOptions() { return mDecorToolbar.getDisplayOptions(); } @Override public Tab newTab() { throw new UnsupportedOperationException("Tabs are not supported in toolbar action bars"); } @Override public void addTab(Tab tab) { throw new UnsupportedOperationException("Tabs are not supported in toolbar action bars"); } @Override public void addTab(Tab tab, boolean setSelected) { throw new UnsupportedOperationException("Tabs are not supported in toolbar action bars"); } @Override public void addTab(Tab tab, int position) { throw new UnsupportedOperationException("Tabs are not supported in toolbar action bars"); } @Override public void addTab(Tab tab, int position, boolean setSelected) { throw new UnsupportedOperationException("Tabs are not supported in toolbar action bars"); } @Override public void removeTab(Tab tab) { throw new UnsupportedOperationException("Tabs are not supported in toolbar action bars"); } @Override public void removeTabAt(int position) { throw new UnsupportedOperationException("Tabs are not supported in toolbar action bars"); } @Override public void removeAllTabs() { throw new UnsupportedOperationException("Tabs are not supported in toolbar action bars"); } @Override public void selectTab(Tab tab) { throw new UnsupportedOperationException("Tabs are not supported in toolbar action bars"); } @Override public Tab getSelectedTab() { throw new UnsupportedOperationException("Tabs are not supported in toolbar action bars"); } @Override public Tab getTabAt(int index) { throw new UnsupportedOperationException("Tabs are not supported in toolbar action bars"); } @Override public int getTabCount() { return 0; } @Override public int getHeight() { return mDecorToolbar.getHeight(); } @Override public void show() { // TODO: Consider a better transition for this. // Right now use no automatic transition so that the app can supply one if desired. mDecorToolbar.setVisibility(View.VISIBLE); } @Override public void hide() { // TODO: Consider a better transition for this. // Right now use no automatic transition so that the app can supply one if desired. mDecorToolbar.setVisibility(View.GONE); } @Override public boolean isShowing() { return mDecorToolbar.getVisibility() == View.VISIBLE; } @Override public boolean openOptionsMenu() { return mDecorToolbar.showOverflowMenu(); } @Override public boolean invalidateOptionsMenu() { mDecorToolbar.getViewGroup().removeCallbacks(mMenuInvalidator); ViewCompat.postOnAnimation(mDecorToolbar.getViewGroup(), mMenuInvalidator); return true; } @Override public boolean collapseActionView() { if (mDecorToolbar.hasExpandedActionView()) { mDecorToolbar.collapseActionView(); return true; } return false; } void populateOptionsMenu() { final Menu menu = getMenu(); final MenuBuilder mb = menu instanceof MenuBuilder ? (MenuBuilder) menu : null; if (mb != null) { mb.stopDispatchingItemsChanged(); } try { menu.clear(); if (!mWindowCallback.onCreatePanelMenu(Window.FEATURE_OPTIONS_PANEL, menu) || !mWindowCallback.onPreparePanel(Window.FEATURE_OPTIONS_PANEL, null, menu)) { menu.clear(); } } finally { if (mb != null) { mb.startDispatchingItemsChanged(); } } } @Override public boolean onMenuKeyEvent(KeyEvent event) { if (event.getAction() == KeyEvent.ACTION_UP) { openOptionsMenu(); } return true; } @Override public boolean onKeyShortcut(int keyCode, KeyEvent ev) { Menu menu = getMenu(); return menu != null ? menu.performShortcut(keyCode, ev, 0) : false; } public void addOnMenuVisibilityListener(OnMenuVisibilityListener listener) { mMenuVisibilityListeners.add(listener); } public void removeOnMenuVisibilityListener(OnMenuVisibilityListener listener) { mMenuVisibilityListeners.remove(listener); } public void dispatchMenuVisibilityChanged(boolean isVisible) { if (isVisible == mLastMenuVisibility) { return; } mLastMenuVisibility = isVisible; final int count = mMenuVisibilityListeners.size(); for (int i = 0; i < count; i++) { mMenuVisibilityListeners.get(i).onMenuVisibilityChanged(isVisible); } } private View getListMenuView(Menu menu) { ensureListMenuPresenter(menu); if (menu == null || mListMenuPresenter == null) { return null; } if (mListMenuPresenter.getAdapter().getCount() > 0) { return (View) mListMenuPresenter.getMenuView(mDecorToolbar.getViewGroup()); } return null; } private void ensureListMenuPresenter(Menu menu) { if (mListMenuPresenter == null && (menu instanceof MenuBuilder)) { MenuBuilder mb = (MenuBuilder) menu; Context context = mDecorToolbar.getContext(); final TypedValue outValue = new TypedValue(); final Resources.Theme widgetTheme = context.getResources().newTheme(); widgetTheme.setTo(context.getTheme()); // Apply the panelMenuListTheme widgetTheme.resolveAttribute(R.attr.panelMenuListTheme, outValue, true); if (outValue.resourceId != 0) { widgetTheme.applyStyle(outValue.resourceId, true); } else { widgetTheme.applyStyle(R.style.Theme_AppCompat_CompactMenu, true); } context = new ContextThemeWrapper(context, 0); context.getTheme().setTo(widgetTheme); // Finally create the list menu presenter mListMenuPresenter = new ListMenuPresenter(context, R.layout.abc_list_menu_item_layout); mListMenuPresenter.setCallback(new PanelMenuPresenterCallback()); mb.addMenuPresenter(mListMenuPresenter); } } private class ToolbarCallbackWrapper extends WindowCallbackWrapper { public ToolbarCallbackWrapper(Window.Callback wrapped) { super(wrapped); } @Override public boolean onPreparePanel(int featureId, View view, Menu menu) { final boolean result = super.onPreparePanel(featureId, view, menu); if (result && !mToolbarMenuPrepared) { mDecorToolbar.setMenuPrepared(); mToolbarMenuPrepared = true; } return result; } @Override public View onCreatePanelView(int featureId) { switch (featureId) { case Window.FEATURE_OPTIONS_PANEL: final Menu menu = mDecorToolbar.getMenu(); if (onPreparePanel(featureId, null, menu) && onMenuOpened(featureId, menu)) { return getListMenuView(menu); } break; } return super.onCreatePanelView(featureId); } } private Menu getMenu() { if (!mMenuCallbackSet) { mDecorToolbar.setMenuCallbacks(new ActionMenuPresenterCallback(), new MenuBuilderCallback()); mMenuCallbackSet = true; } return mDecorToolbar.getMenu(); } private final class ActionMenuPresenterCallback implements MenuPresenter.Callback { private boolean mClosingActionMenu; @Override public boolean onOpenSubMenu(MenuBuilder subMenu) { if (mWindowCallback != null) { mWindowCallback.onMenuOpened(WindowCompat.FEATURE_ACTION_BAR, subMenu); return true; } return false; } @Override public void onCloseMenu(MenuBuilder menu, boolean allMenusAreClosing) { if (mClosingActionMenu) { return; } mClosingActionMenu = true; mDecorToolbar.dismissPopupMenus(); if (mWindowCallback != null) { mWindowCallback.onPanelClosed(WindowCompat.FEATURE_ACTION_BAR, menu); } mClosingActionMenu = false; } } private final class PanelMenuPresenterCallback implements MenuPresenter.Callback { @Override public void onCloseMenu(MenuBuilder menu, boolean allMenusAreClosing) { if (mWindowCallback != null) { mWindowCallback.onPanelClosed(Window.FEATURE_OPTIONS_PANEL, menu); } } @Override public boolean onOpenSubMenu(MenuBuilder subMenu) { if (subMenu == null && mWindowCallback != null) { mWindowCallback.onMenuOpened(Window.FEATURE_OPTIONS_PANEL, subMenu); } return true; } } private final class MenuBuilderCallback implements MenuBuilder.Callback { @Override public boolean onMenuItemSelected(MenuBuilder menu, MenuItem item) { return false; } @Override public void onMenuModeChange(MenuBuilder menu) { if (mWindowCallback != null) { if (mDecorToolbar.isOverflowMenuShowing()) { mWindowCallback.onPanelClosed(WindowCompat.FEATURE_ACTION_BAR, menu); } else if (mWindowCallback.onPreparePanel(Window.FEATURE_OPTIONS_PANEL, null, menu)) { mWindowCallback.onMenuOpened(WindowCompat.FEATURE_ACTION_BAR, menu); } } } } }