Java tutorial
/* * Copyright 2009 Fred Sauer * * 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 com.mansi.client.board; import com.google.gwt.cell.client.EditTextCell; import com.google.gwt.dom.client.Style.Position; import com.google.gwt.user.client.Random; import com.google.gwt.user.client.ui.AbsolutePanel; import com.google.gwt.user.client.ui.HTML; import com.google.gwt.user.client.ui.HasHorizontalAlignment.HorizontalAlignmentConstant; import com.google.gwt.user.client.ui.HasVerticalAlignment.VerticalAlignmentConstant; import com.google.gwt.user.client.ui.HorizontalPanel; import com.google.gwt.user.client.ui.Label; import com.google.gwt.user.client.ui.VerticalPanel; import com.allen_sauer.gwt.dnd.client.DragController; import com.allen_sauer.gwt.dnd.client.PickupDragController; import com.allen_sauer.gwt.dnd.client.drop.HorizontalPanelDropController; import com.allen_sauer.gwt.dnd.client.drop.VerticalPanelDropController; import com.mansi.client.board.Example; import com.mansi.client.text.EditableLabel; import com.mansi.client.text.EditableLabelListener; /** * Example of columns that can be rearranged, with widget that can be moved within a column or * between columns. */ public final class InsertPanelExample extends Example { private static final int COLUMNS = 5; private static final int ROWS = 10; private static final int SPACING = 5; public InsertPanelExample() { // addStyleName(CSS_DEMO_INSERT_PANEL_EXAMPLE); int count = 0; // use the boundary panel as this composite's widget AbsolutePanel boundaryPanel = new AbsolutePanel(); boundaryPanel.setSize("100%", "100%"); setWidget(boundaryPanel); // initialize our column drag controller PickupDragController columnDragController = new PickupDragController(boundaryPanel, false); columnDragController.setBehaviorMultipleSelection(false); // initialize our widget drag controller PickupDragController widgetDragController = new PickupDragController(boundaryPanel, true); widgetDragController.setBehaviorMultipleSelection(false); // initialize horizontal panel to hold our columns HorizontalPanel horizontalPanel = new HorizontalPanel(); // horizontalPanel.setSize("100%", "100%"); horizontalPanel.setSpacing(SPACING); boundaryPanel.add(horizontalPanel); // initialize our column drop controller HorizontalPanelDropController columnDropController = new HorizontalPanelDropController(horizontalPanel); columnDragController.registerDropController(columnDropController); for (int col = 1; col <= COLUMNS; col++) { // initialize a vertical panel to hold the heading and a second vertical // panel VerticalPanel columnCompositePanel = new VerticalPanel(); // initialize inner vertical panel to hold individual widgets VerticalPanel verticalPanel = new VerticalPanelWithSpacer(); verticalPanel.setStyleName("compPanel"); verticalPanel.setSpacing(SPACING); horizontalPanel.add(columnCompositePanel); VerticalPanel widgetHolder = new VerticalPanel(); // initialize a widget drop controller for the current column VerticalPanelDropController widgetDropController = new VerticalPanelDropController(verticalPanel); widgetDragController.registerDropController(widgetDropController); final Label heading = new Label(); // Put together the column pieces final EditableLabel heading_temp = new EditableLabel(""); if (headings[col - 1] != null) { heading_temp.setText(headings[col - 1]); } else { heading_temp.setText("Column " + col); } final int column = col; EditableLabelListener listener = new EditableLabelListener() { @Override public void onLabelModified(String text, EditableLabel sender) { // TODO Auto-generated method stub heading.setText(""); heading_temp.setText(text); headings[column - 1] = heading_temp.getText(); System.out.println(headings[column - 1]); } }; heading_temp.addEditableLabelListener(listener); heading.addStyleName("heading"); heading.setSize("200px", "20px"); columnCompositePanel.add(heading_temp); columnCompositePanel.add(heading); widgetHolder.add(verticalPanel); widgetHolder.setSpacing(SPACING); widgetHolder.setStyleName("columns"); columnCompositePanel.setHeight("370px"); // columnCompositePanel.setSpacing(15); columnCompositePanel.add(widgetHolder); // make the column draggable by its heading columnDragController.makeDraggable(columnCompositePanel, heading); for (int row = 1; row <= ROWS; row++) { if (row < 5) { // initialize a widget HTML widget = new HTML("ID #" + ++count); widget.addStyleName("widget"); widget.setHeight("60px"); widget.setWidth("100px"); verticalPanel.add(widget); // make the widget draggable widgetDragController.makeDraggable(widget); } } } } @Override public String getDescription() { return "Allows drop to occur anywhere among the children of a supported <code>InsertPanel</code>."; } @Override public Class<?>[] getInvolvedClasses() { return new Class[] { InsertPanelExample.class, VerticalPanelDropController.class, VerticalPanelWithSpacer.class, HorizontalPanelDropController.class, PickupDragController.class, }; } }