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jnuit core
There is a newer version: 0.13
/*
 The MIT License (MIT)

 Copyright (c) 2013 devnewton 

 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
 in the Software without restriction, including without limitation the rights
 to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 copies of the Software, and to permit persons to whom the Software is
 furnished to do so, subject to the following conditions:

 The above copyright notice and this permission notice shall be included in
 all copies or substantial portions of the Software.

 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 THE SOFTWARE.
 */
package im.bci.jnuit.widgets;

import im.bci.jnuit.visitors.WidgetVisitor;

/**
 * Widget container with free (fixed position) layout.
 * @author devnewton
 */
public class Container extends Widget {

    private Widget focusedChild;

    @Override
    public Widget getFocusedChild() {
        if (null == focusedChild) {
            focusedChild = getTopLeftFocusableChild();
        }
        return focusedChild;
    }

    @Override
    public void onLeft() {
        if (isFocusSucked()) {
            super.onLeft();
        } else {
            final Widget currentFocusedChild = getFocusedChild();
            Widget closest = findClosestLeftFocusableWidget(currentFocusedChild);
            if (null != closest) {
                setFocusedChild(closest);
            }
        }
    }

    public boolean isFocusSucked() {
        final Widget currentFocusedChild = getFocusedChild();
        return null == currentFocusedChild || currentFocusedChild.isSuckingFocus();
    }

    @Override
    public void onRight() {
        if (isFocusSucked()) {
            super.onRight();
        } else {
            final Widget currentFocusedChild = getFocusedChild();
            Widget closest = findClosestRightFocusableWidget(currentFocusedChild);
            if (null != closest) {
                setFocusedChild(closest);
            }
        }
    }

    @Override
    public void onUp() {
        if (isFocusSucked()) {
            super.onUp();
        } else {
            final Widget currentFocusedChild = getFocusedChild();
            Widget closest = findClosestUpFocusableWidget(currentFocusedChild);
            if (null != closest) {
                setFocusedChild(closest);
            }
        }
    }

    @Override
    public void onDown() {
        if (isFocusSucked()) {
            super.onDown();
        } else {
            final Widget currentFocusedChild = getFocusedChild();
            Widget closest = findClosestDownFocusableWidget(currentFocusedChild);
            if (null != closest) {
                setFocusedChild(closest);
            }
        }
    }

    @Override
    public void onOK() {
        final Widget currentFocusedChild = getFocusedChild();
        if (null != currentFocusedChild) {
            if (currentFocusedChild.isFocusWhore() && !currentFocusedChild.isSuckingFocus()) {
                currentFocusedChild.suckFocus();
                return;
            }
        }
        super.onOK();
    }

    @Override
    public void onCancel() {
        if (isFocusSucked()) {
            super.onCancel();
        }
    }

    @Override
    public void onMouseMove(float mouseX, float mouseY) {
        for (Widget child : getChildren()) {
            if (mouseX >= child.getX() && mouseX <= (child.getX() + child.getWidth()) && mouseY >= child.getY() && mouseY <= (child.getY() + child.getHeight())) {
                if (child.isFocusable() && !isFocusSucked()) {
                    setFocusedChild(child);
                }
                child.onMouseMove(mouseX, mouseY);
            }
        }
    }

    public void setFocusedChild(Widget focusedChild) {
        this.focusedChild = focusedChild;
    }

    @Override
    public void accept(WidgetVisitor visitor) {
        visitor.visit(this);
    }
}