com.badlogic.gdx.scenes.scene2d.ui.Stack Maven / Gradle / Ivy
Show all versions of gdx Show documentation
/*******************************************************************************
* Copyright (c) 2011, Nathan Sweet
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of the nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
******************************************************************************/
package com.badlogic.gdx.scenes.scene2d.ui;
import com.badlogic.gdx.scenes.scene2d.Actor;
import com.badlogic.gdx.scenes.scene2d.Touchable;
import com.badlogic.gdx.scenes.scene2d.utils.Layout;
import com.badlogic.gdx.utils.Array;
import com.badlogic.gdx.utils.SnapshotArray;
/** A stack is a container that sizes its children to its size and positions them at 0,0 on top of each other.
*
* The preferred and min size of the stack is the largest preferred and min size of any children. The max size of the stack is the
* smallest max size of any children.
* @author Nathan Sweet */
public class Stack extends WidgetGroup {
private float prefWidth, prefHeight, minWidth, minHeight, maxWidth, maxHeight;
private boolean sizeInvalid = true;
public Stack () {
setTransform(false);
setWidth(150);
setHeight(150);
setTouchable(Touchable.childrenOnly);
}
public Stack (Actor... actors) {
this();
for (Actor actor : actors)
addActor(actor);
}
public void invalidate () {
super.invalidate();
sizeInvalid = true;
}
private void computeSize () {
sizeInvalid = false;
prefWidth = 0;
prefHeight = 0;
minWidth = 0;
minHeight = 0;
maxWidth = 0;
maxHeight = 0;
SnapshotArray children = getChildren();
for (int i = 0, n = children.size; i < n; i++) {
Actor child = children.get(i);
float childMaxWidth, childMaxHeight;
if (child instanceof Layout) {
Layout layout = (Layout)child;
prefWidth = Math.max(prefWidth, layout.getPrefWidth());
prefHeight = Math.max(prefHeight, layout.getPrefHeight());
minWidth = Math.max(minWidth, layout.getMinWidth());
minHeight = Math.max(minHeight, layout.getMinHeight());
childMaxWidth = layout.getMaxWidth();
childMaxHeight = layout.getMaxHeight();
} else {
prefWidth = Math.max(prefWidth, child.getWidth());
prefHeight = Math.max(prefHeight, child.getHeight());
minWidth = Math.max(minWidth, child.getWidth());
minHeight = Math.max(minHeight, child.getHeight());
childMaxWidth = 0;
childMaxHeight = 0;
}
if (childMaxWidth > 0) maxWidth = maxWidth == 0 ? childMaxWidth : Math.min(maxWidth, childMaxWidth);
if (childMaxHeight > 0) maxHeight = maxHeight == 0 ? childMaxHeight : Math.min(maxHeight, childMaxHeight);
}
}
public void add (Actor actor) {
addActor(actor);
}
public void layout () {
if (sizeInvalid) computeSize();
float width = getWidth(), height = getHeight();
Array children = getChildren();
for (int i = 0, n = children.size; i < n; i++) {
Actor child = children.get(i);
child.setBounds(0, 0, width, height);
if (child instanceof Layout) ((Layout)child).validate();
}
}
public float getPrefWidth () {
if (sizeInvalid) computeSize();
return prefWidth;
}
public float getPrefHeight () {
if (sizeInvalid) computeSize();
return prefHeight;
}
public float getMinWidth () {
if (sizeInvalid) computeSize();
return minWidth;
}
public float getMinHeight () {
if (sizeInvalid) computeSize();
return minHeight;
}
public float getMaxWidth () {
if (sizeInvalid) computeSize();
return maxWidth;
}
public float getMaxHeight () {
if (sizeInvalid) computeSize();
return maxHeight;
}
}