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<?xml version="1.0" encoding="utf-8"?> | |
<resources> | |
<declare-styleable name="ForegroundLinearLayout"> | |
<attr name="android:foreground" /> | |
<attr name="android:foregroundInsidePadding" /> | |
<attr name="android:foregroundGravity" /> | |
</declare-styleable> | |
</resources> |
/* | |
* Copyright (C) 2006 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 your.package; | |
import android.content.Context; | |
import android.content.res.TypedArray; | |
import android.graphics.Canvas; | |
import android.graphics.Rect; | |
import android.graphics.drawable.Drawable; | |
import android.util.AttributeSet; | |
import android.view.Gravity; | |
import android.widget.LinearLayout; | |
import your.package.R; | |
public class ForegroundLinearLayout extends LinearLayout { | |
private Drawable mForeground; | |
private final Rect mSelfBounds = new Rect(); | |
private final Rect mOverlayBounds = new Rect(); | |
private int mForegroundGravity = Gravity.FILL; | |
protected boolean mForegroundInPadding = true; | |
boolean mForegroundBoundsChanged = false; | |
public ForegroundLinearLayout(Context context) { | |
super(context); | |
} | |
public ForegroundLinearLayout(Context context, AttributeSet attrs) { | |
this(context, attrs, 0); | |
} | |
public ForegroundLinearLayout(Context context, AttributeSet attrs, int defStyle) { | |
super(context, attrs, defStyle); | |
TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.ForegroundLinearLayout, | |
defStyle, 0); | |
mForegroundGravity = a.getInt( | |
R.styleable.ForegroundLinearLayout_android_foregroundGravity, mForegroundGravity); | |
final Drawable d = a.getDrawable(R.styleable.ForegroundLinearLayout_android_foreground); | |
if (d != null) { | |
setForeground(d); | |
} | |
mForegroundInPadding = a.getBoolean( | |
R.styleable.ForegroundLinearLayout_android_foregroundInsidePadding, true); | |
a.recycle(); | |
} | |
/** | |
* Describes how the foreground is positioned. | |
* | |
* @return foreground gravity. | |
* | |
* @see #setForegroundGravity(int) | |
*/ | |
public int getForegroundGravity() { | |
return mForegroundGravity; | |
} | |
/** | |
* Describes how the foreground is positioned. Defaults to START and TOP. | |
* | |
* @param foregroundGravity See {@link android.view.Gravity} | |
* | |
* @see #getForegroundGravity() | |
*/ | |
public void setForegroundGravity(int foregroundGravity) { | |
if (mForegroundGravity != foregroundGravity) { | |
if ((foregroundGravity & Gravity.RELATIVE_HORIZONTAL_GRAVITY_MASK) == 0) { | |
foregroundGravity |= Gravity.START; | |
} | |
if ((foregroundGravity & Gravity.VERTICAL_GRAVITY_MASK) == 0) { | |
foregroundGravity |= Gravity.TOP; | |
} | |
mForegroundGravity = foregroundGravity; | |
if (mForegroundGravity == Gravity.FILL && mForeground != null) { | |
Rect padding = new Rect(); | |
mForeground.getPadding(padding); | |
} | |
requestLayout(); | |
} | |
} | |
@Override | |
protected boolean verifyDrawable(Drawable who) { | |
return super.verifyDrawable(who) || (who == mForeground); | |
} | |
@Override | |
public void jumpDrawablesToCurrentState() { | |
super.jumpDrawablesToCurrentState(); | |
if (mForeground != null) mForeground.jumpToCurrentState(); | |
} | |
@Override | |
protected void drawableStateChanged() { | |
super.drawableStateChanged(); | |
if (mForeground != null && mForeground.isStateful()) { | |
mForeground.setState(getDrawableState()); | |
} | |
} | |
/** | |
* Supply a Drawable that is to be rendered on top of all of the child | |
* views in the frame layout. Any padding in the Drawable will be taken | |
* into account by ensuring that the children are inset to be placed | |
* inside of the padding area. | |
* | |
* @param drawable The Drawable to be drawn on top of the children. | |
*/ | |
public void setForeground(Drawable drawable) { | |
if (mForeground != drawable) { | |
if (mForeground != null) { | |
mForeground.setCallback(null); | |
unscheduleDrawable(mForeground); | |
} | |
mForeground = drawable; | |
if (drawable != null) { | |
setWillNotDraw(false); | |
drawable.setCallback(this); | |
if (drawable.isStateful()) { | |
drawable.setState(getDrawableState()); | |
} | |
if (mForegroundGravity == Gravity.FILL) { | |
Rect padding = new Rect(); | |
drawable.getPadding(padding); | |
} | |
} else { | |
setWillNotDraw(true); | |
} | |
requestLayout(); | |
invalidate(); | |
} | |
} | |
/** | |
* Returns the drawable used as the foreground of this FrameLayout. The | |
* foreground drawable, if non-null, is always drawn on top of the children. | |
* | |
* @return A Drawable or null if no foreground was set. | |
*/ | |
public Drawable getForeground() { | |
return mForeground; | |
} | |
@Override | |
protected void onLayout(boolean changed, int left, int top, int right, int bottom) { | |
super.onLayout(changed, left, top, right, bottom); | |
mForegroundBoundsChanged = changed; | |
} | |
@Override | |
protected void onSizeChanged(int w, int h, int oldw, int oldh) { | |
super.onSizeChanged(w, h, oldw, oldh); | |
mForegroundBoundsChanged = true; | |
} | |
@Override | |
public void draw(Canvas canvas) { | |
super.draw(canvas); | |
if (mForeground != null) { | |
final Drawable foreground = mForeground; | |
if (mForegroundBoundsChanged) { | |
mForegroundBoundsChanged = false; | |
final Rect selfBounds = mSelfBounds; | |
final Rect overlayBounds = mOverlayBounds; | |
final int w = getRight() - getLeft(); | |
final int h = getBottom() - getTop(); | |
if (mForegroundInPadding) { | |
selfBounds.set(0, 0, w, h); | |
} else { | |
selfBounds.set(getPaddingLeft(), getPaddingTop(), | |
w - getPaddingRight(), h - getPaddingBottom()); | |
} | |
Gravity.apply(mForegroundGravity, foreground.getIntrinsicWidth(), | |
foreground.getIntrinsicHeight(), selfBounds, overlayBounds); | |
foreground.setBounds(overlayBounds); | |
} | |
foreground.draw(canvas); | |
} | |
} | |
} |
For travelers, see the better solution by @gabrielemariotti in commit f5b5e4d6c87a247aff5b477cea13859338f813fa.
He has since corrected the logic to drawableHotspotChanged(float x, float y).
I had a problem (see http://stackoverflow.com/a/28015226/1696171) in AbsListViews and RecyclerViews.
https://github.com/NightlyNexus/cardslib/blob/master/library-core/src/main/java/it/gmariotti/cardslib/library/view/ForegroundLinearLayout.java
fixes the issue.
Using a RippleDrawable as the background causes it to bleed out of the layout bounds. Setting it to the foreground works fine, however.
Anyone know of a fix for this?
The simplest fix would probably be to give the ripple a mask so that it's clipped by the view's bounds.
minSdkVersion 17 it's getting crash and the log cat error "Caused by: java.lang.NoSuchMethodError: android.widget.LinearLayout.".
It might be not support for lower version ?
@gabrielemariotti Thank you for this solution.