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/* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
package org.mozilla.gecko.home;
import org.mozilla.gecko.R;
import org.mozilla.gecko.ThumbnailHelper;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Rect;
import android.util.AttributeSet;
import android.view.ContextMenu.ContextMenuInfo;
import android.view.View;
import android.widget.AbsListView;
import android.widget.GridView;
/**
* A grid view of top and pinned sites.
* Each cell in the grid is a TopSitesGridItemView.
*/
public class TopSitesGridView extends GridView {
private static final String LOGTAG = "GeckoTopSitesGridView";
// Listener for editing pinned sites.
public static interface OnEditPinnedSiteListener {
public void onEditPinnedSite(int position, String searchTerm);
}
// Max number of top sites that needs to be shown.
private final int mMaxSites;
// Number of columns to show.
private final int mNumColumns;
// Horizontal spacing in between the rows.
private final int mHorizontalSpacing;
// Vertical spacing in between the rows.
private final int mVerticalSpacing;
// Measured width of this view.
private int mMeasuredWidth;
// Measured height of this view.
private int mMeasuredHeight;
// A dummy View used to measure the required size of the child Views.
private final TopSitesGridItemView dummyChildView;
// Context menu info.
private TopSitesGridContextMenuInfo mContextMenuInfo;
// Whether we're handling focus changes or not. This is used
// to avoid infinite re-layouts when using this GridView as
// a ListView header view (see bug 918044).
private boolean mIsHandlingFocusChange;
public TopSitesGridView(Context context) {
this(context, null);
}
public TopSitesGridView(Context context, AttributeSet attrs) {
this(context, attrs, R.attr.topSitesGridViewStyle);
}
public TopSitesGridView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
mMaxSites = getResources().getInteger(R.integer.number_of_top_sites);
mNumColumns = getResources().getInteger(R.integer.number_of_top_sites_cols);
setNumColumns(mNumColumns);
TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.TopSitesGridView, defStyle, 0);
mHorizontalSpacing = a.getDimensionPixelOffset(R.styleable.TopSitesGridView_android_horizontalSpacing, 0x00);
mVerticalSpacing = a.getDimensionPixelOffset(R.styleable.TopSitesGridView_android_verticalSpacing, 0x00);
a.recycle();
dummyChildView = new TopSitesGridItemView(context);
// Set a default LayoutParams on the child, if it doesn't have one on its own.
AbsListView.LayoutParams params = (AbsListView.LayoutParams) dummyChildView.getLayoutParams();
if (params == null) {
params = new AbsListView.LayoutParams(AbsListView.LayoutParams.WRAP_CONTENT,
AbsListView.LayoutParams.WRAP_CONTENT);
dummyChildView.setLayoutParams(params);
}
}
@Override
protected void onFocusChanged(boolean gainFocus, int direction, Rect previouslyFocusedRect) {
mIsHandlingFocusChange = true;
super.onFocusChanged(gainFocus, direction, previouslyFocusedRect);
mIsHandlingFocusChange = false;
}
@Override
public void requestLayout() {
if (!mIsHandlingFocusChange) {
super.requestLayout();
}
}
@Override
public int getColumnWidth() {
// This method will be called from onMeasure() too.
// It's better to use getMeasuredWidth(), as it is safe in this case.
final int totalHorizontalSpacing = mNumColumns > 0 ? (mNumColumns - 1) * mHorizontalSpacing : 0;
return (getMeasuredWidth() - getPaddingLeft() - getPaddingRight() - totalHorizontalSpacing) / mNumColumns;
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
// Sets the padding for this view.
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
final int measuredWidth = getMeasuredWidth();
if (measuredWidth == mMeasuredWidth) {
// Return the cached values as the width is the same.
setMeasuredDimension(mMeasuredWidth, mMeasuredHeight);
return;
}
final int columnWidth = getColumnWidth();
// Measure the exact width of the child, and the height based on the width.
// Note: the child (and TopSitesThumbnailView) takes care of calculating its height.
int childWidthSpec = MeasureSpec.makeMeasureSpec(columnWidth, MeasureSpec.EXACTLY);
int childHeightSpec = MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED);
dummyChildView.measure(childWidthSpec, childHeightSpec);
final int childHeight = dummyChildView.getMeasuredHeight();
// This is the maximum width of the contents of each child in the grid.
// Use this as the target width for thumbnails.
final int thumbnailWidth = dummyChildView.getMeasuredWidth() - dummyChildView.getPaddingLeft() - dummyChildView.getPaddingRight();
ThumbnailHelper.getInstance().setThumbnailWidth(thumbnailWidth);
// Number of rows required to show these top sites.
final int rows = (int) Math.ceil((double) mMaxSites / mNumColumns);
final int childrenHeight = childHeight * rows;
final int totalVerticalSpacing = rows > 0 ? (rows - 1) * mVerticalSpacing : 0;
// Total height of this view.
final int measuredHeight = childrenHeight + getPaddingTop() + getPaddingBottom() + totalVerticalSpacing;
setMeasuredDimension(measuredWidth, measuredHeight);
mMeasuredWidth = measuredWidth;
mMeasuredHeight = measuredHeight;
}
@Override
public ContextMenuInfo getContextMenuInfo() {
return mContextMenuInfo;
}
public void setContextMenuInfo(TopSitesGridContextMenuInfo contextMenuInfo) {
mContextMenuInfo = contextMenuInfo;
}
/**
* Stores information regarding the creation of the context menu for a GridView item.
*/
public static class TopSitesGridContextMenuInfo extends HomeContextMenuInfo {
public int type = -1;
public TopSitesGridContextMenuInfo(View targetView, int position, long id) {
super(targetView, position, id);
this.itemType = RemoveItemType.HISTORY;
}
}
}
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