net.sf.mmm.client.ui.gwt.widgets.PopupMouseHandler.java Source code

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Here is the source code for net.sf.mmm.client.ui.gwt.widgets.PopupMouseHandler.java

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/* Copyright (c) The m-m-m Team, Licensed under the Apache License, Version 2.0
 * http://www.apache.org/licenses/LICENSE-2.0 */
package net.sf.mmm.client.ui.gwt.widgets;

import net.sf.mmm.client.ui.api.common.LengthProperty;
import net.sf.mmm.client.ui.api.common.Rectangle;
import net.sf.mmm.client.ui.gwt.widgets.handler.AbstractMouseDragHandler;
import net.sf.mmm.util.lang.api.Direction;

import com.google.gwt.dom.client.NativeEvent;
import com.google.gwt.event.dom.client.MouseDownEvent;
import com.google.gwt.user.client.Window;

/**
 * This class is the handler for mouse events to move an resize a {@link PopupWindow}.
 *
 * @author Joerg Hohwiller (hohwille at users.sourceforge.net)
 * @since 1.0.0
 */
class PopupMouseHandler extends AbstractMouseDragHandler {

    /** The {@link PopupWindow} to manage. */
    private final PopupWindow popupWindow;

    /** The resize {@link Direction} or <code>null</code> for move. */
    private final Direction resizeDirection;

    /** The current {@link Rectangle} of the {@link PopupWindow}. */
    private Rectangle popupRectangle;

    /** The minimum width of the {@link PopupWindow}. */
    private int minWidth;

    /** The minimum height of the {@link PopupWindow}. */
    private int minHeight;

    /**
     * The constructor.
     *
     * @param resizeDirection is the resize {@link Direction} or <code>null</code> for move.
     * @param popupWindow is the {@link PopupWindow}.
     */
    public PopupMouseHandler(PopupWindow popupWindow, Direction resizeDirection) {

        super();
        this.popupWindow = popupWindow;
        this.resizeDirection = resizeDirection;
    }

    /**
     * {@inheritDoc}
     */
    @Override
    protected boolean isActive() {

        if (this.resizeDirection == null) {
            if (!this.popupWindow.isMovable() || this.popupWindow.isMaximized()) {
                return false;
            }
        } else {
            if (!this.popupWindow.isResizable() || this.popupWindow.isMaximized()) {
                return false;
            }
        }
        return super.isActive();
    }

    /**
     * {@inheritDoc}
     */
    @Override
    protected void initializeOnMouseDown(MouseDownEvent event) {

        super.initializeOnMouseDown(event);
        this.popupRectangle = new Rectangle(this.popupWindow.getAbsoluteLeft(), this.popupWindow.getAbsoluteTop(),
                this.popupWindow.getOffsetWidth(), this.popupWindow.getOffsetHeight());

        int clientWidth = Window.getClientWidth();
        int clientHeight = Window.getClientHeight();
        this.minWidth = (int) LengthProperty.MIN_WIDTH.getLengthInPixel(this.popupWindow, clientWidth);
        this.minHeight = (int) LengthProperty.MIN_HEIGHT.getLengthInPixel(this.popupWindow, clientHeight);
        if (this.minWidth == 0) {
            this.minWidth = clientWidth / 10;
        }
        if (this.minHeight == 0) {
            this.minHeight = clientHeight / 10;
        }
    }

    /**
     * {@inheritDoc}
     */
    @Override
    protected void onMouseMove(int deltaX, int deltaY, NativeEvent nativeEvent) {

        Rectangle newRectangle;

        if (this.resizeDirection == null) {
            // move...
            Rectangle clippingArea = new Rectangle(0, 0,
                    Window.getClientWidth() + this.popupRectangle.getWidth() - 32,
                    Window.getClientHeight() + this.popupRectangle.getHeight() - 32);
            newRectangle = this.popupRectangle.moveBy(deltaX, deltaY).clipTo(clippingArea, true);
        } else {
            newRectangle = this.popupRectangle.resize(deltaX, deltaY, this.resizeDirection, this.minWidth,
                    this.minHeight);
        }
        this.popupWindow.setPixelSize(newRectangle.getWidth(), newRectangle.getHeight());
        this.popupWindow.setPopupPosition(newRectangle.getX(), newRectangle.getY());
    }

}