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package com.android.camera.ui;
import static android.view.View.MeasureSpec.makeMeasureSpec;
import android.graphics.Rect;
import android.view.MotionEvent;
import android.view.View.MeasureSpec;
import javax.microedition.khronos.opengles.GL11;
public class GLListView extends GLView {
private static final String TAG = "GLListView";
private static final int MOTION_THRESHOLD = 15;
private static final int INDEX_NONE = -1;
private static final int MOTION_NONE = -1;
private Model mModel;
private int mHighlightIndex = INDEX_NONE;
private GLView mHighlightView;
private NinePatchTexture mHighLight;
private NinePatchTexture mScrollbar;
private int mVisibleStart = 0; // inclusive
private int mVisibleEnd = 0; // exclusive
private int mMotionStartY = MOTION_NONE;
private boolean mHasMeasured = false;
private boolean mHasMoved = false;
private OnItemSelectedListener mOnItemSelectedListener;
static public interface Model {
public int size();
public GLView getView(int index);
public boolean isSelectable(int index);
}
static public interface OnItemSelectedListener {
public void onItemSelected(GLView view, int position);
}
public void setHighLight(NinePatchTexture highLight) {
mHighLight = highLight;
}
public void setDataModel(Model model) {
mModel = model;
mScrollY = 0;
requestLayout();
}
public void setOnItemSelectedListener(OnItemSelectedListener l) {
mOnItemSelectedListener = l;
}
@Override
protected void render(GLRootView root, GL11 gl) {
root.clipRect(0, 0, getWidth(), getHeight());
if (mHighlightIndex != INDEX_NONE) {
GLView view = mModel.getView(mHighlightIndex);
Rect bounds = view.bounds();
if (mHighLight != null) {
int width = bounds.width();
int height = bounds.height();
mHighLight.setSize(width, height);
if (mHighLight.bind(root, gl)) {
root.draw2D(bounds.left - mScrollX,
bounds.top - mScrollY, width, height);
}
}
}
super.render(root, gl);
root.clearClip();
if (mScrollbar != null && mScrollHeight > getHeight()) {
int width = this.mScrollbar.getIntrinsicWidth();
int height = getHeight() * getHeight() / mScrollHeight;
mScrollbar.setSize(width, height);
if (mScrollbar.bind(root, gl)) {
int yoffset = mScrollY * getHeight() / mScrollHeight;
root.draw2D(getWidth() - width, yoffset, width, height);
}
}
}
@Override
protected void onMeasure(int widthSpec, int heightSpec) {
int heightMode = MeasureSpec.getMode(heightSpec);
int widthMode = MeasureSpec.getMode(widthSpec);
// first get the total height
int height = 0;
int maxWidth = 0;
for (int i = 0, n = mModel.size(); i < n; ++i) {
GLView view = mModel.getView(i);
view.measure(widthSpec, MeasureSpec.UNSPECIFIED);
height += view.getMeasuredHeight();
maxWidth = Math.max(maxWidth, view.getMeasuredWidth());
}
// if we need to show the scroll bar ...
if ((mScrollbar != null && (heightMode == MeasureSpec.AT_MOST
|| heightMode == MeasureSpec.EXACTLY))
&& height > MeasureSpec.getSize(heightSpec)) {
if (widthMode != MeasureSpec.UNSPECIFIED) {
int cWidthSpec = widthSpec - mScrollbar.getIntrinsicWidth();
height = 0;
for (int i = 0, n = mModel.size(); i < n; ++i) {
GLView view = mModel.getView(i);
view.measure(cWidthSpec, MeasureSpec.UNSPECIFIED);
height += view.getMeasuredHeight();
maxWidth = Math.max(maxWidth, view.getMeasuredWidth());
}
}
maxWidth += mScrollbar.getIntrinsicWidth();
}
mScrollHeight = height;
mHasMeasured = true;
new MeasureHelper(this)
.setPreferedContentSize(maxWidth, height)
.measure(widthSpec, heightSpec);
}
@Override
public int getComponentCount() {
return mVisibleEnd - mVisibleStart;
}
@Override
public GLView getComponent(int index) {
if (index < 0 || index >= mVisibleEnd - mVisibleStart) {
throw new ArrayIndexOutOfBoundsException(index);
}
return mModel.getView(mVisibleStart + index);
}
@Override
public void requestLayout() {
mHasMeasured = false;
super.requestLayout();
}
@Override
protected void onLayout(
boolean change, int left, int top, int right, int bottom) {
if (!mHasMeasured || mMeasuredWidth != (right - left)) {
measure(makeMeasureSpec(right - left, MeasureSpec.EXACTLY),
makeMeasureSpec(bottom - top, MeasureSpec.EXACTLY));
}
int width = mScrollHeight > (bottom - top) && mScrollbar != null
? right - left - mScrollbar.getIntrinsicWidth()
: right - left;
int yoffset = 0;
for (int i = 0, n = mModel.size(); i < n; ++i) {
GLView item = mModel.getView(i);
int nextOffset = yoffset + item.getMeasuredHeight();
item.layout(0, yoffset, width, nextOffset);
yoffset = nextOffset;
}
setScrollPosition(mScrollY, true);
}
private void setScrollPosition(int position, boolean force) {
int height = getHeight();
position = Math.max(0, position);
position = Math.min(mScrollHeight - height, position);
if (!force && position == mScrollY) return;
mScrollY = position;
int n = mModel.size();
int start = 0;
int end = 0;
for (start = 0; start < n; ++start) {
if (position < mModel.getView(start).mBounds.bottom) break;
}
position += height;
for (end = start; end < n; ++ end) {
if (position <= mModel.getView(end).mBounds.top) break;
}
setVisibleRange(start , end);
invalidate();
}
private void setVisibleRange(int start, int end) {
if (start == mVisibleStart && end == mVisibleEnd) return;
mVisibleStart = start;
mVisibleEnd = end;
}
@Override
protected boolean dispatchTouchEvent(MotionEvent event) {
return onTouch(event);
}
@Override @SuppressWarnings("fallthrough")
protected boolean onTouch(MotionEvent event) {
int y = (int) event.getY();
switch (event.getAction()) {
case MotionEvent.ACTION_MOVE:
if ((mMotionStartY != MOTION_NONE) && (mHasMoved
|| Math.abs(y - mMotionStartY) > MOTION_THRESHOLD)) {
setHighlightItem(null, INDEX_NONE);
setScrollPosition(mScrollY + mMotionStartY - y, false);
mMotionStartY = y;
mHasMoved = true;
} else {
findAndSetHighlightItem(y);
}
break;
case MotionEvent.ACTION_DOWN:
mHasMoved = false;
mMotionStartY = mScrollHeight > getHeight() ? y : MOTION_NONE;
break;
case MotionEvent.ACTION_UP:
if (!mHasMoved) {
if (mOnItemSelectedListener != null && mHighlightView != null) {
mOnItemSelectedListener
.onItemSelected(mHighlightView, mHighlightIndex);
}
mHasMoved = false;
}
case MotionEvent.ACTION_CANCEL:
case MotionEvent.ACTION_OUTSIDE:
setHighlightItem(null, INDEX_NONE);
}
return true;
}
private void findAndSetHighlightItem(int y) {
int position = y + mScrollY;
for (int i = mVisibleStart, n = mVisibleEnd; i < n; ++i) {
GLView child = mModel.getView(i);
if (child.mBounds.bottom > position) {
if (mModel.isSelectable(i)) {
setHighlightItem(child, i);
return;
}
break;
}
}
setHighlightItem(null, INDEX_NONE);
}
private void setHighlightItem(GLView view, int index) {
if (index == mHighlightIndex) return;
mHighlightIndex = index;
mHighlightView = view;
if (mHighLight != null) invalidate();
}
public void setScroller(NinePatchTexture scrollbar) {
this.mScrollbar = scrollbar;
requestLayout();
}
}
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