package grimbo.android.demo.slidingmenu;
import android.content.Context;
import android.os.Handler;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.view.ViewTreeObserver.OnGlobalLayoutListener;
import android.widget.HorizontalScrollView;
/**
* A HorizontalScrollView (HSV) implementation that disallows touch events (so no scrolling can be done by the user).
*
* This HSV MUST contain a single ViewGroup as its only child, and this ViewGroup will be used to display the children Views
* passed in to the initViews() method.
*/
public class MyHorizontalScrollView extends HorizontalScrollView {
public MyHorizontalScrollView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
init(context);
}
public MyHorizontalScrollView(Context context, AttributeSet attrs) {
super(context, attrs);
init(context);
}
public MyHorizontalScrollView(Context context) {
super(context);
init(context);
}
void init(Context context) {
// remove the fading as the HSV looks better without it
setHorizontalFadingEdgeEnabled(false);
setVerticalFadingEdgeEnabled(false);
}
/**
* @param children
* The child Views to add to parent.
* @param scrollToViewIdx
* The index of the View to scroll to after initialisation.
* @param sizeCallback
* A SizeCallback to interact with the HSV.
*/
public void initViews(View[] children, int scrollToViewIdx, SizeCallback sizeCallback) {
// A ViewGroup MUST be the only child of the HSV
ViewGroup parent = (ViewGroup) getChildAt(0);
// Add all the children, but add them invisible so that the layouts are calculated, but you can't see the Views
for (int i = 0; i < children.length; i++) {
children[i].setVisibility(View.INVISIBLE);
parent.addView(children[i]);
}
// Add a layout listener to this HSV
// This listener is responsible for arranging the child views.
OnGlobalLayoutListener listener = new MyOnGlobalLayoutListener(parent, children, scrollToViewIdx, sizeCallback);
getViewTreeObserver().addOnGlobalLayoutListener(listener);
}
@Override
public boolean onTouchEvent(MotionEvent ev) {
// Do not allow touch events.
return false;
}
@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
// Do not allow touch events.
return false;
}
/**
* An OnGlobalLayoutListener impl that passes on the call to onGlobalLayout to a SizeCallback, before removing all the Views
* in the HSV and adding them again with calculated widths and heights.
*/
class MyOnGlobalLayoutListener implements OnGlobalLayoutListener {
ViewGroup parent;
View[] children;
int scrollToViewIdx;
int scrollToViewPos = 0;
SizeCallback sizeCallback;
/**
* @param parent
* The parent to which the child Views should be added.
* @param children
* The child Views to add to parent.
* @param scrollToViewIdx
* The index of the View to scroll to after initialisation.
* @param sizeCallback
* A SizeCallback to interact with the HSV.
*/
public MyOnGlobalLayoutListener(ViewGroup parent, View[] children, int scrollToViewIdx, SizeCallback sizeCallback) {
this.parent = parent;
this.children = children;
this.scrollToViewIdx = scrollToViewIdx;
this.sizeCallback = sizeCallback;
}
@Override
public void onGlobalLayout() {
// System.out.println("onGlobalLayout");
final HorizontalScrollView me = MyHorizontalScrollView.this;
// The listener will remove itself as a layout listener to the HSV
me.getViewTreeObserver().removeGlobalOnLayoutListener(this);
// Allow the SizeCallback to 'see' the Views before we remove them and re-add them.
// This lets the SizeCallback prepare View sizes, ahead of calls to SizeCallback.getViewSize().
sizeCallback.onGlobalLayout();
parent.removeViewsInLayout(0, children.length);
final int w = me.getMeasuredWidth();
final int h = me.getMeasuredHeight();
// System.out.println("w=" + w + ", h=" + h);
// Add each view in turn, and apply the width and height returned by the SizeCallback.
int[] dims = new int[2];
scrollToViewPos = 0;
for (int i = 0; i < children.length; i++) {
sizeCallback.getViewSize(i, w, h, dims);
// System.out.println("addView w=" + dims[0] + ", h=" + dims[1]);
children[i].setVisibility(View.VISIBLE);
parent.addView(children[i], dims[0], dims[1]);
if (i < scrollToViewIdx) {
scrollToViewPos += dims[0];
}
}
// For some reason we need to post this action, rather than call immediately.
// If we try immediately, it will not scroll.
new Handler().post(new Runnable() {
@Override
public void run() {
me.scrollBy(scrollToViewPos, 0);
}
});
}
}
/**
* Callback interface to interact with the HSV.
*/
public interface SizeCallback {
/**
* Used to allow clients to measure Views before re-adding them.
*/
public void onGlobalLayout();
/**
* Used by clients to specify the View dimensions.
*
* @param idx
* Index of the View.
* @param w
* Width of the parent View.
* @param h
* Height of the parent View.
* @param dims
* dims[0] should be set to View width. dims[1] should be set to View height.
*/
public void getViewSize(int idx, int w, int h, int[] dims);
}
}
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