ViewManager.java revision 9a67c82089e43d37f5038c74b0e1dca8edc4ac8a 
1/*
2 * Copyright (C) 2009 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.webkit;
18
19import android.view.View;
20import android.widget.AbsoluteLayout;
21
22import java.util.ArrayList;
23
24class ViewManager {
25    private final WebView mWebView;
26    private final ArrayList<ChildView> mChildren = new ArrayList<ChildView>();
27    private boolean mHidden;
28    private boolean mReadyToDraw;
29
30    class ChildView {
31        int x;
32        int y;
33        int width;
34        int height;
35        View mView; // generic view to show
36
37        ChildView() {
38        }
39
40        void setBounds(int x, int y, int width, int height) {
41            this.x = x;
42            this.y = y;
43            this.width = width;
44            this.height = height;
45        }
46
47        void attachView(int x, int y, int width, int height) {
48            if (mView == null) {
49                return;
50            }
51            setBounds(x, y, width, height);
52            final AbsoluteLayout.LayoutParams lp =
53                    new AbsoluteLayout.LayoutParams(ctvD(width), ctvD(height),
54                            ctvX(x), ctvY(y));
55            mWebView.mPrivateHandler.post(new Runnable() {
56                public void run() {
57                    // This method may be called multiple times. If the view is
58                    // already attached, just set the new LayoutParams,
59                    // otherwise attach the view and add it to the list of
60                    // children.
61                    if (mView.getParent() != null) {
62                        mView.setLayoutParams(lp);
63                    } else {
64                        attachViewOnUIThread(lp);
65                    }
66                }
67            });
68        }
69
70        void attachViewOnUIThread(AbsoluteLayout.LayoutParams lp) {
71            mWebView.addView(mView, lp);
72            mChildren.add(this);
73            if (!mReadyToDraw) {
74                mView.setVisibility(View.GONE);
75            }
76        }
77
78        void removeView() {
79            if (mView == null) {
80                return;
81            }
82            mWebView.mPrivateHandler.post(new Runnable() {
83                public void run() {
84                    removeViewOnUIThread();
85                }
86            });
87        }
88
89        void removeViewOnUIThread() {
90            mWebView.removeView(mView);
91            mChildren.remove(this);
92        }
93    }
94
95    ViewManager(WebView w) {
96        mWebView = w;
97    }
98
99    ChildView createView() {
100        return new ChildView();
101    }
102
103    /**
104     * Shorthand for calling mWebView.contentToViewDimension.  Used when
105     * obtaining a view dimension from a content dimension, whether it be in x
106     * or y.
107     */
108    private int ctvD(int val) {
109        return mWebView.contentToViewDimension(val);
110    }
111
112    /**
113     * Shorthand for calling mWebView.contentToViewX.  Used when obtaining a
114     * view x coordinate from a content x coordinate.
115     */
116    private int ctvX(int val) {
117        return mWebView.contentToViewX(val);
118    }
119
120    /**
121     * Shorthand for calling mWebView.contentToViewY.  Used when obtaining a
122     * view y coordinate from a content y coordinate.
123     */
124    private int ctvY(int val) {
125        return mWebView.contentToViewY(val);
126    }
127
128    void scaleAll() {
129        for (ChildView v : mChildren) {
130            View view = v.mView;
131            AbsoluteLayout.LayoutParams lp =
132                    (AbsoluteLayout.LayoutParams) view.getLayoutParams();
133            lp.width = ctvD(v.width);
134            lp.height = ctvD(v.height);
135            lp.x = ctvX(v.x);
136            lp.y = ctvY(v.y);
137            view.setLayoutParams(lp);
138        }
139    }
140
141    void hideAll() {
142        if (mHidden) {
143            return;
144        }
145        for (ChildView v : mChildren) {
146            v.mView.setVisibility(View.GONE);
147        }
148        mHidden = true;
149    }
150
151    void showAll() {
152        if (!mHidden) {
153            return;
154        }
155        for (ChildView v : mChildren) {
156            v.mView.setVisibility(View.VISIBLE);
157        }
158        mHidden = false;
159    }
160
161    void postResetStateAll() {
162        mWebView.mPrivateHandler.post(new Runnable() {
163            public void run() {
164                mReadyToDraw = false;
165            }
166        });
167    }
168
169    void postReadyToDrawAll() {
170        mWebView.mPrivateHandler.post(new Runnable() {
171            public void run() {
172                mReadyToDraw = true;
173                for (ChildView v : mChildren) {
174                    v.mView.setVisibility(View.VISIBLE);
175                }
176            }
177        });
178    }
179}
180