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/*
* Copyright (C) 2012 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.internal.widget;
import com.android.internal.app.ActionBarImpl;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Rect;
import android.util.AttributeSet;
import android.util.Log;
import android.view.View;
import android.widget.FrameLayout;
/**
* Special layout for the containing of an overlay action bar (and its
* content) to correctly handle fitting system windows when the content
* has request that its layout ignore them.
*/
public class ActionBarOverlayLayout extends FrameLayout {
private int mActionBarHeight;
private ActionBarImpl mActionBar;
private int mWindowVisibility = View.VISIBLE;
private View mContent;
private View mActionBarTop;
private ActionBarContainer mContainerView;
private ActionBarView mActionView;
private View mActionBarBottom;
private int mLastSystemUiVisibility;
private final Rect mZeroRect = new Rect(0, 0, 0, 0);
static final int[] mActionBarSizeAttr = new int [] {
com.android.internal.R.attr.actionBarSize
};
public ActionBarOverlayLayout(Context context) {
super(context);
init(context);
}
public ActionBarOverlayLayout(Context context, AttributeSet attrs) {
super(context, attrs);
init(context);
}
private void init(Context context) {
TypedArray ta = getContext().getTheme().obtainStyledAttributes(mActionBarSizeAttr);
mActionBarHeight = ta.getDimensionPixelSize(0, 0);
ta.recycle();
}
public void setActionBar(ActionBarImpl impl) {
mActionBar = impl;
if (getWindowToken() != null) {
// This is being initialized after being added to a window;
// make sure to update all state now.
mActionBar.setWindowVisibility(mWindowVisibility);
if (mLastSystemUiVisibility != 0) {
int newVis = mLastSystemUiVisibility;
onWindowSystemUiVisibilityChanged(newVis);
requestFitSystemWindows();
}
}
}
public void setShowingForActionMode(boolean showing) {
if (showing) {
// Here's a fun hack: if the status bar is currently being hidden,
// and the application has asked for stable content insets, then
// we will end up with the action mode action bar being shown
// without the status bar, but moved below where the status bar
// would be. Not nice. Trying to have this be positioned
// correctly is not easy (basically we need yet *another* content
// inset from the window manager to know where to put it), so
// instead we will just temporarily force the status bar to be shown.
if ((getWindowSystemUiVisibility() & (SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
| SYSTEM_UI_FLAG_LAYOUT_STABLE))
== (SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN | SYSTEM_UI_FLAG_LAYOUT_STABLE)) {
setDisabledSystemUiVisibility(SYSTEM_UI_FLAG_FULLSCREEN);
}
} else {
setDisabledSystemUiVisibility(0);
}
}
@Override
public void onWindowSystemUiVisibilityChanged(int visible) {
super.onWindowSystemUiVisibilityChanged(visible);
pullChildren();
final int diff = mLastSystemUiVisibility ^ visible;
mLastSystemUiVisibility = visible;
final boolean barVisible = (visible&SYSTEM_UI_FLAG_FULLSCREEN) == 0;
final boolean wasVisible = mActionBar != null ? mActionBar.isSystemShowing() : true;
if (mActionBar != null) {
if (barVisible) mActionBar.showForSystem();
else mActionBar.hideForSystem();
}
if ((diff&SYSTEM_UI_FLAG_LAYOUT_STABLE) != 0) {
if (mActionBar != null) {
requestFitSystemWindows();
}
}
}
@Override
protected void onWindowVisibilityChanged(int visibility) {
super.onWindowVisibilityChanged(visibility);
mWindowVisibility = visibility;
if (mActionBar != null) {
mActionBar.setWindowVisibility(visibility);
}
}
private boolean applyInsets(View view, Rect insets, boolean left, boolean top,
boolean bottom, boolean right) {
boolean changed = false;
FrameLayout.LayoutParams lp = (FrameLayout.LayoutParams)view.getLayoutParams();
if (left && lp.leftMargin != insets.left) {
changed = true;
lp.leftMargin = insets.left;
}
if (top && lp.topMargin != insets.top) {
changed = true;
lp.topMargin = insets.top;
}
if (right && lp.rightMargin != insets.right) {
changed = true;
lp.rightMargin = insets.right;
}
if (bottom && lp.bottomMargin != insets.bottom) {
changed = true;
lp.bottomMargin = insets.bottom;
}
return changed;
}
@Override
protected boolean fitSystemWindows(Rect insets) {
pullChildren();
final int vis = getWindowSystemUiVisibility();
final boolean stable = (vis & SYSTEM_UI_FLAG_LAYOUT_STABLE) != 0;
// The top and bottom action bars are always within the content area.
boolean changed = applyInsets(mActionBarTop, insets, true, true, false, true);
if (mActionBarBottom != null) {
changed |= applyInsets(mActionBarBottom, insets, true, false, true, true);
}
// If the window has not requested system UI layout flags, we need to
// make sure its content is not being covered by system UI... though it
// will still be covered by the action bar since they have requested it to
// overlay.
if ((vis & SYSTEM_UI_LAYOUT_FLAGS) == 0) {
changed |= applyInsets(mContent, insets, true, true, true, true);
// The insets are now consumed.
insets.set(0, 0, 0, 0);
} else {
changed |= applyInsets(mContent, mZeroRect, true, true, true, true);
}
if (stable || mActionBarTop.getVisibility() == VISIBLE) {
// The action bar creates additional insets for its content to use.
insets.top += mActionBarHeight;
}
if (mActionBar != null && mActionBar.hasNonEmbeddedTabs()) {
View tabs = mContainerView.getTabContainer();
if (stable || (tabs != null && tabs.getVisibility() == VISIBLE)) {
// If tabs are not embedded, adjust insets to account for them.
insets.top += mActionBarHeight;
}
}
if (mActionView.isSplitActionBar()) {
if (stable || (mActionBarBottom != null
&& mActionBarBottom.getVisibility() == VISIBLE)) {
// If action bar is split, adjust buttom insets for it.
insets.bottom += mActionBarHeight;
}
}
if (changed) {
requestLayout();
}
return super.fitSystemWindows(insets);
}
void pullChildren() {
if (mContent == null) {
mContent = findViewById(com.android.internal.R.id.content);
mActionBarTop = findViewById(com.android.internal.R.id.top_action_bar);
mContainerView = (ActionBarContainer)findViewById(
com.android.internal.R.id.action_bar_container);
mActionView = (ActionBarView) findViewById(com.android.internal.R.id.action_bar);
mActionBarBottom = findViewById(com.android.internal.R.id.split_action_bar);
}
}
}
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