Java tutorial
/* 50AH-code ========= 50 Android Hacks (http://manning.com/sessa/) book source code Copyright (c) 2012 Manning Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */ /* * Copyright (C) 2010 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 com.actionbarsherlock.internal.view.menu; import java.util.HashSet; import java.util.Set; import android.content.Context; import android.content.res.TypedArray; import android.graphics.Rect; import android.graphics.drawable.Drawable; import android.os.Build; import android.text.TextUtils; import android.util.AttributeSet; import android.view.Gravity; import android.view.MotionEvent; import android.view.View; import android.view.accessibility.AccessibilityEvent; import android.widget.ImageButton; import android.widget.LinearLayout; import android.widget.Toast; import com.actionbarsherlock.R; import com.actionbarsherlock.internal.view.View_HasStateListenerSupport; import com.actionbarsherlock.internal.view.View_OnAttachStateChangeListener; import com.actionbarsherlock.internal.widget.CapitalizingButton; import static com.actionbarsherlock.internal.ResourcesCompat.getResources_getBoolean; /** * @hide */ public class ActionMenuItemView extends LinearLayout implements MenuView.ItemView, View.OnClickListener, View.OnLongClickListener, ActionMenuView.ActionMenuChildView, View_HasStateListenerSupport { //UNUSED private static final String TAG = "ActionMenuItemView"; private MenuItemImpl mItemData; private CharSequence mTitle; private MenuBuilder.ItemInvoker mItemInvoker; private ImageButton mImageButton; private CapitalizingButton mTextButton; private boolean mAllowTextWithIcon; private boolean mExpandedFormat; private int mMinWidth; private final Set<View_OnAttachStateChangeListener> mListeners = new HashSet<View_OnAttachStateChangeListener>(); public ActionMenuItemView(Context context) { this(context, null); } public ActionMenuItemView(Context context, AttributeSet attrs) { this(context, attrs, 0); } public ActionMenuItemView(Context context, AttributeSet attrs, int defStyle) { //TODO super(context, attrs, defStyle); super(context, attrs); mAllowTextWithIcon = getResources_getBoolean(context, R.bool.abs__config_allowActionMenuItemTextWithIcon); TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.SherlockActionMenuItemView, 0, 0); mMinWidth = a.getDimensionPixelSize(R.styleable.SherlockActionMenuItemView_android_minWidth, 0); a.recycle(); } @Override public void addOnAttachStateChangeListener(View_OnAttachStateChangeListener listener) { mListeners.add(listener); } @Override public void removeOnAttachStateChangeListener(View_OnAttachStateChangeListener listener) { mListeners.remove(listener); } @Override protected void onAttachedToWindow() { super.onAttachedToWindow(); for (View_OnAttachStateChangeListener listener : mListeners) { listener.onViewAttachedToWindow(this); } } @Override protected void onDetachedFromWindow() { super.onDetachedFromWindow(); for (View_OnAttachStateChangeListener listener : mListeners) { listener.onViewDetachedFromWindow(this); } } @Override public void onFinishInflate() { mImageButton = (ImageButton) findViewById(R.id.abs__imageButton); mTextButton = (CapitalizingButton) findViewById(R.id.abs__textButton); mImageButton.setOnClickListener(this); mTextButton.setOnClickListener(this); mImageButton.setOnLongClickListener(this); setOnClickListener(this); setOnLongClickListener(this); } public MenuItemImpl getItemData() { return mItemData; } public void initialize(MenuItemImpl itemData, int menuType) { mItemData = itemData; setIcon(itemData.getIcon()); setTitle(itemData.getTitleForItemView(this)); // Title only takes effect if there is no icon setId(itemData.getItemId()); setVisibility(itemData.isVisible() ? View.VISIBLE : View.GONE); setEnabled(itemData.isEnabled()); } @Override public void setEnabled(boolean enabled) { super.setEnabled(enabled); mImageButton.setEnabled(enabled); mTextButton.setEnabled(enabled); } public void onClick(View v) { if (mItemInvoker != null) { mItemInvoker.invokeItem(mItemData); } } public void setItemInvoker(MenuBuilder.ItemInvoker invoker) { mItemInvoker = invoker; } public boolean prefersCondensedTitle() { return true; } public void setCheckable(boolean checkable) { // TODO Support checkable action items } public void setChecked(boolean checked) { // TODO Support checkable action items } public void setExpandedFormat(boolean expandedFormat) { if (mExpandedFormat != expandedFormat) { mExpandedFormat = expandedFormat; if (mItemData != null) { mItemData.actionFormatChanged(); } } } private void updateTextButtonVisibility() { boolean visible = !TextUtils.isEmpty(mTextButton.getText()); visible &= mImageButton.getDrawable() == null || (mItemData.showsTextAsAction() && (mAllowTextWithIcon || mExpandedFormat)); mTextButton.setVisibility(visible ? VISIBLE : GONE); } public void setIcon(Drawable icon) { mImageButton.setImageDrawable(icon); if (icon != null) { mImageButton.setVisibility(VISIBLE); } else { mImageButton.setVisibility(GONE); } updateTextButtonVisibility(); } public boolean hasText() { return mTextButton.getVisibility() != GONE; } public void setShortcut(boolean showShortcut, char shortcutKey) { // Action buttons don't show text for shortcut keys. } public void setTitle(CharSequence title) { mTitle = title; mTextButton.setTextCompat(mTitle); setContentDescription(mTitle); updateTextButtonVisibility(); } @Override public boolean dispatchPopulateAccessibilityEvent(AccessibilityEvent event) { onPopulateAccessibilityEvent(event); return true; } @Override public void onPopulateAccessibilityEvent(AccessibilityEvent event) { if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.ICE_CREAM_SANDWICH) { super.onPopulateAccessibilityEvent(event); } final CharSequence cdesc = getContentDescription(); if (!TextUtils.isEmpty(cdesc)) { event.getText().add(cdesc); } } @Override public boolean dispatchHoverEvent(MotionEvent event) { // Don't allow children to hover; we want this to be treated as a single component. if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.ICE_CREAM_SANDWICH) { return onHoverEvent(event); } return false; } public boolean showsIcon() { return true; } public boolean needsDividerBefore() { return hasText() && mItemData.getIcon() == null; } public boolean needsDividerAfter() { return hasText(); } @Override public boolean onLongClick(View v) { if (hasText()) { // Don't show the cheat sheet for items that already show text. return false; } final int[] screenPos = new int[2]; final Rect displayFrame = new Rect(); getLocationOnScreen(screenPos); getWindowVisibleDisplayFrame(displayFrame); final Context context = getContext(); final int width = getWidth(); final int height = getHeight(); final int midy = screenPos[1] + height / 2; final int screenWidth = context.getResources().getDisplayMetrics().widthPixels; Toast cheatSheet = Toast.makeText(context, mItemData.getTitle(), Toast.LENGTH_SHORT); if (midy < displayFrame.height()) { // Show along the top; follow action buttons cheatSheet.setGravity(Gravity.TOP | Gravity.RIGHT, screenWidth - screenPos[0] - width / 2, height); } else { // Show along the bottom center cheatSheet.setGravity(Gravity.BOTTOM | Gravity.CENTER_HORIZONTAL, 0, height); } cheatSheet.show(); return true; } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { super.onMeasure(widthMeasureSpec, heightMeasureSpec); final int widthMode = MeasureSpec.getMode(widthMeasureSpec); final int specSize = MeasureSpec.getSize(widthMeasureSpec); final int oldMeasuredWidth = getMeasuredWidth(); final int targetWidth = widthMode == MeasureSpec.AT_MOST ? Math.min(specSize, mMinWidth) : mMinWidth; if (widthMode != MeasureSpec.EXACTLY && mMinWidth > 0 && oldMeasuredWidth < targetWidth) { // Remeasure at exactly the minimum width. super.onMeasure(MeasureSpec.makeMeasureSpec(targetWidth, MeasureSpec.EXACTLY), heightMeasureSpec); } } }