1/*
2 * Copyright (C) 2010 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package android.support.v7.internal.view.menu;
18
19import android.content.Context;
20import android.content.res.Configuration;
21import android.content.res.Resources;
22import android.content.res.TypedArray;
23import android.graphics.Rect;
24import android.graphics.drawable.Drawable;
25import android.os.Build;
26import android.support.v4.view.GravityCompat;
27import android.support.v4.view.ViewCompat;
28import android.support.v7.appcompat.R;
29import android.support.v7.internal.text.AllCapsTransformationMethod;
30import android.support.v7.internal.widget.CompatTextView;
31import android.support.v7.widget.ActionMenuView;
32import android.support.v7.widget.ListPopupWindow;
33import android.text.TextUtils;
34import android.text.method.TransformationMethod;
35import android.util.AttributeSet;
36import android.view.Gravity;
37import android.view.MotionEvent;
38import android.view.View;
39import android.widget.Toast;
40
41import java.util.Locale;
42
43/**
44 * @hide
45 */
46public class ActionMenuItemView extends CompatTextView
47        implements MenuView.ItemView, View.OnClickListener, View.OnLongClickListener,
48        ActionMenuView.ActionMenuChildView {
49
50    private static final String TAG = "ActionMenuItemView";
51
52    private MenuItemImpl mItemData;
53    private CharSequence mTitle;
54    private Drawable mIcon;
55    private MenuBuilder.ItemInvoker mItemInvoker;
56    private ListPopupWindow.ForwardingListener mForwardingListener;
57    private PopupCallback mPopupCallback;
58
59    private boolean mAllowTextWithIcon;
60    private boolean mExpandedFormat;
61    private int mMinWidth;
62    private int mSavedPaddingLeft;
63
64    private static final int MAX_ICON_SIZE = 32; // dp
65    private int mMaxIconSize;
66
67    public ActionMenuItemView(Context context) {
68        this(context, null);
69    }
70
71    public ActionMenuItemView(Context context, AttributeSet attrs) {
72        this(context, attrs, 0);
73    }
74
75    public ActionMenuItemView(Context context, AttributeSet attrs, int defStyle) {
76        super(context, attrs, defStyle);
77        final Resources res = context.getResources();
78        mAllowTextWithIcon = res.getBoolean(
79                R.bool.abc_config_allowActionMenuItemTextWithIcon);
80        TypedArray a = context.obtainStyledAttributes(attrs,
81                R.styleable.ActionMenuItemView, defStyle, 0);
82        mMinWidth = a.getDimensionPixelSize(
83                R.styleable.ActionMenuItemView_android_minWidth, 0);
84        a.recycle();
85
86        final float density = res.getDisplayMetrics().density;
87        mMaxIconSize = (int) (MAX_ICON_SIZE * density + 0.5f);
88
89        setOnClickListener(this);
90        setOnLongClickListener(this);
91
92        setTransformationMethod(new AllCapsTransformationMethod(context));
93
94        mSavedPaddingLeft = -1;
95    }
96
97    public void onConfigurationChanged(Configuration newConfig) {
98        if (Build.VERSION.SDK_INT >= 8) {
99            super.onConfigurationChanged(newConfig);
100        }
101
102        mAllowTextWithIcon = getContext().getResources().getBoolean(
103                R.bool.abc_config_allowActionMenuItemTextWithIcon);
104        updateTextButtonVisibility();
105    }
106
107    @Override
108    public void setPadding(int l, int t, int r, int b) {
109        mSavedPaddingLeft = l;
110        super.setPadding(l, t, r, b);
111    }
112
113    public MenuItemImpl getItemData() {
114        return mItemData;
115    }
116
117    public void initialize(MenuItemImpl itemData, int menuType) {
118        mItemData = itemData;
119
120        setIcon(itemData.getIcon());
121        setTitle(itemData.getTitleForItemView(this)); // Title only takes effect if there is no icon
122        setId(itemData.getItemId());
123
124        setVisibility(itemData.isVisible() ? View.VISIBLE : View.GONE);
125        setEnabled(itemData.isEnabled());
126        if (itemData.hasSubMenu()) {
127            if (mForwardingListener == null) {
128                mForwardingListener = new ActionMenuItemForwardingListener();
129            }
130        }
131    }
132
133    @Override
134    public boolean onTouchEvent(MotionEvent e) {
135        if (mItemData.hasSubMenu() && mForwardingListener != null
136                && mForwardingListener.onTouch(this, e)) {
137            return true;
138        }
139        return super.onTouchEvent(e);
140    }
141
142    @Override
143    public void onClick(View v) {
144        if (mItemInvoker != null) {
145            mItemInvoker.invokeItem(mItemData);
146        }
147    }
148
149    public void setItemInvoker(MenuBuilder.ItemInvoker invoker) {
150        mItemInvoker = invoker;
151    }
152
153    public void setPopupCallback(PopupCallback popupCallback) {
154        mPopupCallback = popupCallback;
155    }
156
157    public boolean prefersCondensedTitle() {
158        return true;
159    }
160
161    public void setCheckable(boolean checkable) {
162        // TODO Support checkable action items
163    }
164
165    public void setChecked(boolean checked) {
166        // TODO Support checkable action items
167    }
168
169    public void setExpandedFormat(boolean expandedFormat) {
170        if (mExpandedFormat != expandedFormat) {
171            mExpandedFormat = expandedFormat;
172            if (mItemData != null) {
173                mItemData.actionFormatChanged();
174            }
175        }
176    }
177
178    private void updateTextButtonVisibility() {
179        boolean visible = !TextUtils.isEmpty(mTitle);
180        visible &= mIcon == null ||
181                (mItemData.showsTextAsAction() && (mAllowTextWithIcon || mExpandedFormat));
182
183        setText(visible ? mTitle : null);
184    }
185
186    public void setIcon(Drawable icon) {
187        mIcon = icon;
188        if (icon != null) {
189            int width = icon.getIntrinsicWidth();
190            int height = icon.getIntrinsicHeight();
191            if (width > mMaxIconSize) {
192                final float scale = (float) mMaxIconSize / width;
193                width = mMaxIconSize;
194                height *= scale;
195            }
196            if (height > mMaxIconSize) {
197                final float scale = (float) mMaxIconSize / height;
198                height = mMaxIconSize;
199                width *= scale;
200            }
201            icon.setBounds(0, 0, width, height);
202        }
203        setCompoundDrawables(icon, null, null, null);
204
205        updateTextButtonVisibility();
206    }
207
208    public boolean hasText() {
209        return !TextUtils.isEmpty(getText());
210    }
211
212    public void setShortcut(boolean showShortcut, char shortcutKey) {
213        // Action buttons don't show text for shortcut keys.
214    }
215
216    public void setTitle(CharSequence title) {
217        mTitle = title;
218
219        setContentDescription(mTitle);
220        updateTextButtonVisibility();
221    }
222
223    public boolean showsIcon() {
224        return true;
225    }
226
227    public boolean needsDividerBefore() {
228        return hasText() && mItemData.getIcon() == null;
229    }
230
231    public boolean needsDividerAfter() {
232        return hasText();
233    }
234
235    @Override
236    public boolean onLongClick(View v) {
237        if (hasText()) {
238            // Don't show the cheat sheet for items that already show text.
239            return false;
240        }
241
242        final int[] screenPos = new int[2];
243        final Rect displayFrame = new Rect();
244        getLocationOnScreen(screenPos);
245        getWindowVisibleDisplayFrame(displayFrame);
246
247        final Context context = getContext();
248        final int width = getWidth();
249        final int height = getHeight();
250        final int midy = screenPos[1] + height / 2;
251        int referenceX = screenPos[0] + width / 2;
252        if (ViewCompat.getLayoutDirection(v) == ViewCompat.LAYOUT_DIRECTION_LTR) {
253            final int screenWidth = context.getResources().getDisplayMetrics().widthPixels;
254            referenceX = screenWidth - referenceX; // mirror
255        }
256        Toast cheatSheet = Toast.makeText(context, mItemData.getTitle(), Toast.LENGTH_SHORT);
257        if (midy < displayFrame.height()) {
258            // Show along the top; follow action buttons
259            cheatSheet.setGravity(Gravity.TOP | GravityCompat.END, referenceX, height);
260        } else {
261            // Show along the bottom center
262            cheatSheet.setGravity(Gravity.BOTTOM | Gravity.CENTER_HORIZONTAL, 0, height);
263        }
264        cheatSheet.show();
265        return true;
266    }
267
268    @Override
269    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
270        final boolean textVisible = hasText();
271        if (textVisible && mSavedPaddingLeft >= 0) {
272            super.setPadding(mSavedPaddingLeft, getPaddingTop(),
273                    getPaddingRight(), getPaddingBottom());
274        }
275
276        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
277
278        final int widthMode = MeasureSpec.getMode(widthMeasureSpec);
279        final int widthSize = MeasureSpec.getSize(widthMeasureSpec);
280        final int oldMeasuredWidth = getMeasuredWidth();
281        final int targetWidth = widthMode == MeasureSpec.AT_MOST ? Math.min(widthSize, mMinWidth)
282                : mMinWidth;
283
284        if (widthMode != MeasureSpec.EXACTLY && mMinWidth > 0 && oldMeasuredWidth < targetWidth) {
285            // Remeasure at exactly the minimum width.
286            super.onMeasure(MeasureSpec.makeMeasureSpec(targetWidth, MeasureSpec.EXACTLY),
287                    heightMeasureSpec);
288        }
289
290        if (!textVisible && mIcon != null) {
291            // TextView won't center compound drawables in both dimensions without
292            // a little coercion. Pad in to center the icon after we've measured.
293            final int w = getMeasuredWidth();
294            final int dw = mIcon.getBounds().width();
295            super.setPadding((w - dw) / 2, getPaddingTop(), getPaddingRight(), getPaddingBottom());
296        }
297    }
298
299    private class ActionMenuItemForwardingListener extends ListPopupWindow.ForwardingListener {
300        public ActionMenuItemForwardingListener() {
301            super(ActionMenuItemView.this);
302        }
303
304        @Override
305        public ListPopupWindow getPopup() {
306            if (mPopupCallback != null) {
307                return mPopupCallback.getPopup();
308            }
309            return null;
310        }
311
312        @Override
313        protected boolean onForwardingStarted() {
314            // Call the invoker, then check if the expected popup is showing.
315            if (mItemInvoker != null && mItemInvoker.invokeItem(mItemData)) {
316                final ListPopupWindow popup = getPopup();
317                return popup != null && popup.isShowing();
318            }
319            return false;
320        }
321
322        @Override
323        protected boolean onForwardingStopped() {
324            final ListPopupWindow popup = getPopup();
325            if (popup != null) {
326                popup.dismiss();
327                return true;
328            }
329            return false;
330        }
331    }
332
333    public static abstract class PopupCallback {
334        public abstract ListPopupWindow getPopup();
335    }
336}
337