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/*
* Copyright (C) 2011 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.android.swe.browser.view;
import android.database.DataSetObserver;
import android.graphics.Canvas;
import android.view.MotionEvent;
import android.view.View;
import android.widget.Adapter;
import java.util.ArrayList;
/**
* common code for pie views
*/
public abstract class BasePieView implements PieMenu.PieView {
protected Adapter mAdapter;
private DataSetObserver mObserver;
protected ArrayList<View> mViews;
protected OnLayoutListener mListener;
protected int mCurrent;
protected int mChildWidth;
protected int mChildHeight;
protected int mWidth;
protected int mHeight;
protected int mLeft;
protected int mTop;
public BasePieView() {
}
public void setLayoutListener(OnLayoutListener l) {
mListener = l;
}
public void setAdapter(Adapter adapter) {
mAdapter = adapter;
if (adapter == null) {
if (mAdapter != null) {
mAdapter.unregisterDataSetObserver(mObserver);
}
mViews = null;
mCurrent = -1;
} else {
mObserver = new DataSetObserver() {
@Override
public void onChanged() {
buildViews();
}
@Override
public void onInvalidated() {
mViews.clear();
}
};
mAdapter.registerDataSetObserver(mObserver);
setCurrent(0);
}
}
public void setCurrent(int ix) {
mCurrent = ix;
}
public Adapter getAdapter() {
return mAdapter;
}
protected void buildViews() {
if (mAdapter != null) {
final int n = mAdapter.getCount();
if (mViews == null) {
mViews = new ArrayList<View>(n);
} else {
mViews.clear();
}
mChildWidth = 0;
mChildHeight = 0;
for (int i = 0; i < n; i++) {
View view = mAdapter.getView(i, null, null);
view.measure(View.MeasureSpec.UNSPECIFIED,
View.MeasureSpec.UNSPECIFIED);
mChildWidth = Math.max(mChildWidth, view.getMeasuredWidth());
mChildHeight = Math.max(mChildHeight, view.getMeasuredHeight());
mViews.add(view);
}
}
}
/**
* this will be called before the first draw call
* needs to set top, left, width, height
*/
@Override
public void layout(int anchorX, int anchorY, boolean left, float angle,
int parentHeight) {
if (mListener != null) {
mListener.onLayout(anchorX, anchorY, left);
}
}
@Override
public abstract void draw(Canvas canvas);
protected void drawView(View view, Canvas canvas) {
final int state = canvas.save();
canvas.translate(view.getLeft(), view.getTop());
view.draw(canvas);
canvas.restoreToCount(state);
}
protected abstract int findChildAt(int y);
@Override
public boolean onTouchEvent(MotionEvent evt) {
int action = evt.getActionMasked();
int evtx = (int) evt.getX();
int evty = (int) evt.getY();
if ((evtx < mLeft) || (evtx >= mLeft + mWidth)
|| (evty < mTop) || (evty >= mTop + mHeight)) {
return false;
}
switch (action) {
case MotionEvent.ACTION_MOVE:
View v = mViews.get(mCurrent);
setCurrent(Math.max(0, Math.min(mViews.size() -1,
findChildAt(evty))));
View v1 = mViews.get(mCurrent);
if (v != v1) {
v.setPressed(false);
v1.setPressed(true);
}
break;
case MotionEvent.ACTION_UP:
mViews.get(mCurrent).performClick();
mViews.get(mCurrent).setPressed(false);
break;
default:
break;
}
return true;
}
}
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