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/*
* Copyright (C) 2011 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 android.widget;
import android.content.Context;
import android.graphics.Canvas;
import android.util.AttributeSet;
import android.view.View;
/**
* Space is a lightweight View subclass that may be used to create gaps between components
* in general purpose layouts.
*/
public final class Space extends View {
/**
* {@inheritDoc}
*/
public Space(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
super(context, attrs, defStyleAttr, defStyleRes);
if (getVisibility() == VISIBLE) {
setVisibility(INVISIBLE);
}
}
/**
* {@inheritDoc}
*/
public Space(Context context, AttributeSet attrs, int defStyleAttr) {
this(context, attrs, defStyleAttr, 0);
}
/**
* {@inheritDoc}
*/
public Space(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
/**
* {@inheritDoc}
*/
public Space(Context context) {
//noinspection NullableProblems
this(context, null);
}
/**
* Draw nothing.
*
* @param canvas an unused parameter.
*/
@Override
public void draw(Canvas canvas) {
}
/**
* Compare to: {@link View#getDefaultSize(int, int)}
* If mode is AT_MOST, return the child size instead of the parent size
* (unless it is too big).
*/
private static int getDefaultSize2(int size, int measureSpec) {
int result = size;
int specMode = MeasureSpec.getMode(measureSpec);
int specSize = MeasureSpec.getSize(measureSpec);
switch (specMode) {
case MeasureSpec.UNSPECIFIED:
result = size;
break;
case MeasureSpec.AT_MOST:
result = Math.min(size, specSize);
break;
case MeasureSpec.EXACTLY:
result = specSize;
break;
}
return result;
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
setMeasuredDimension(
getDefaultSize2(getSuggestedMinimumWidth(), widthMeasureSpec),
getDefaultSize2(getSuggestedMinimumHeight(), heightMeasureSpec));
}
}
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