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/*
* Copyright (C) 2009 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.webkit;
import android.view.SurfaceView;
import android.view.View;
import android.widget.AbsoluteLayout;
import java.util.ArrayList;
class ViewManager {
private final WebView mWebView;
private final ArrayList<ChildView> mChildren = new ArrayList<ChildView>();
private boolean mHidden;
private boolean mReadyToDraw;
// Threshold at which a surface is prevented from further increasing in size
private final int MAX_SURFACE_THRESHOLD;
class ChildView {
int x;
int y;
int width;
int height;
View mView; // generic view to show
/* set to true if the view is a surface and it has exceeded the pixel
threshold specified in MAX_SURFACE_THRESHOLD.
*/
boolean isFixedSize = false;
ChildView() {
}
void setBounds(int x, int y, int width, int height) {
this.x = x;
this.y = y;
this.width = width;
this.height = height;
}
void attachView(int x, int y, int width, int height) {
if (mView == null) {
return;
}
setBounds(x, y, width, height);
mWebView.mPrivateHandler.post(new Runnable() {
public void run() {
// This method may be called multiple times. If the view is
// already attached, just set the new LayoutParams,
// otherwise attach the view and add it to the list of
// children.
AbsoluteLayout.LayoutParams lp = computeLayout(ChildView.this);
if (mView.getParent() != null) {
mView.setLayoutParams(lp);
} else {
attachViewOnUIThread(lp);
}
}
});
}
private void attachViewOnUIThread(AbsoluteLayout.LayoutParams lp) {
mWebView.addView(mView, lp);
mChildren.add(this);
if (!mReadyToDraw) {
mView.setVisibility(View.GONE);
}
}
void removeView() {
if (mView == null) {
return;
}
mWebView.mPrivateHandler.post(new Runnable() {
public void run() {
removeViewOnUIThread();
}
});
}
private void removeViewOnUIThread() {
mWebView.removeView(mView);
mChildren.remove(this);
}
}
ViewManager(WebView w) {
mWebView = w;
int pixelArea = w.getResources().getDisplayMetrics().widthPixels *
w.getResources().getDisplayMetrics().heightPixels;
/* set the threshold to be 275% larger than the screen size. The
percentage is simply an estimation and is not based on anything but
basic trial-and-error tests run on multiple devices.
*/
MAX_SURFACE_THRESHOLD = (int)(pixelArea * 2.75);
}
ChildView createView() {
return new ChildView();
}
/**
* Shorthand for calling mWebView.contentToViewDimension. Used when
* obtaining a view dimension from a content dimension, whether it be in x
* or y.
*/
private int ctvD(int val) {
return mWebView.contentToViewDimension(val);
}
/**
* Shorthand for calling mWebView.contentToViewX. Used when obtaining a
* view x coordinate from a content x coordinate.
*/
private int ctvX(int val) {
return mWebView.contentToViewX(val);
}
/**
* Shorthand for calling mWebView.contentToViewY. Used when obtaining a
* view y coordinate from a content y coordinate.
*/
private int ctvY(int val) {
return mWebView.contentToViewY(val);
}
/**
* This should only be called from the UI thread.
*/
private AbsoluteLayout.LayoutParams computeLayout(ChildView v) {
// if the surface has exceed a predefined threshold then fix the size
// of the surface.
if (!v.isFixedSize && (v.width * v.height) > MAX_SURFACE_THRESHOLD
&& v.mView instanceof SurfaceView) {
((SurfaceView)v.mView).getHolder().setFixedSize(v.width, v.height);
v.isFixedSize = true;
}
AbsoluteLayout.LayoutParams lp =
(AbsoluteLayout.LayoutParams) v.mView.getLayoutParams();
if (lp == null)
lp = new AbsoluteLayout.LayoutParams(ctvD(v.width), ctvD(v.height),
ctvX(v.x), ctvY(v.y));
else {
lp.width = ctvD(v.width);
lp.height = ctvD(v.height);
lp.x = ctvX(v.x);
lp.y = ctvY(v.y);
}
return lp;
}
void scaleAll() {
for (ChildView v : mChildren) {
v.mView.setLayoutParams(computeLayout(v));
}
}
void hideAll() {
if (mHidden) {
return;
}
for (ChildView v : mChildren) {
v.mView.setVisibility(View.GONE);
}
mHidden = true;
}
void showAll() {
if (!mHidden) {
return;
}
for (ChildView v : mChildren) {
v.mView.setVisibility(View.VISIBLE);
}
mHidden = false;
}
void postResetStateAll() {
mWebView.mPrivateHandler.post(new Runnable() {
public void run() {
mReadyToDraw = false;
}
});
}
void postReadyToDrawAll() {
mWebView.mPrivateHandler.post(new Runnable() {
public void run() {
mReadyToDraw = true;
for (ChildView v : mChildren) {
v.mView.setVisibility(View.VISIBLE);
}
}
});
}
ChildView hitTest(int contentX, int contentY) {
if (mHidden) {
return null;
}
for (ChildView v : mChildren) {
if (v.mView.getVisibility() == View.VISIBLE) {
if (contentX >= v.x && contentX < (v.x + v.width)
&& contentY >= v.y && contentY < (v.y + v.height)) {
return v;
}
}
}
return null;
}
}
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