Java tutorial
/* * Copyright 2014-2016 CyberVision, Inc. * * 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 org.kaaproject.kaa.server.admin.client.mvp.view.base; import org.kaaproject.avro.ui.gwt.client.AvroUiResources.AvroUiStyle; import org.kaaproject.avro.ui.gwt.client.input.InputEvent; import org.kaaproject.avro.ui.gwt.client.input.InputEventHandler; import org.kaaproject.avro.ui.gwt.client.widget.AlertPanel; import org.kaaproject.avro.ui.gwt.client.widget.AlertPanel.Type; import org.kaaproject.kaa.server.admin.client.KaaAdminResources.KaaAdminStyle; import org.kaaproject.kaa.server.admin.client.mvp.view.BaseDetailsView; import org.kaaproject.kaa.server.admin.client.util.Utils; import com.google.gwt.core.client.GWT; import com.google.gwt.event.dom.client.ChangeEvent; import com.google.gwt.event.dom.client.ChangeHandler; import com.google.gwt.event.dom.client.ClickEvent; import com.google.gwt.event.dom.client.ClickHandler; import com.google.gwt.event.dom.client.HasClickHandlers; import com.google.gwt.safehtml.shared.SafeHtmlUtils; import com.google.gwt.uibinder.client.UiBinder; import com.google.gwt.uibinder.client.UiField; import com.google.gwt.user.client.ui.Button; import com.google.gwt.user.client.ui.Composite; import com.google.gwt.user.client.ui.DockLayoutPanel; import com.google.gwt.user.client.ui.FlexTable; import com.google.gwt.user.client.ui.FlowPanel; import com.google.gwt.user.client.ui.HTMLPanel; import com.google.gwt.user.client.ui.HasHorizontalAlignment; import com.google.gwt.user.client.ui.HasVerticalAlignment; 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.google.gwt.user.client.ui.Widget; public abstract class BaseDetailsViewImpl extends Composite implements InputEventHandler, ChangeHandler, BaseDetailsView { interface BaseDetailsViewImplUiBinder extends UiBinder<Widget, BaseDetailsViewImpl> { } private static BaseDetailsViewImplUiBinder uiBinder = GWT.create(BaseDetailsViewImplUiBinder.class); protected static final String FULL_WIDTH = "100%"; protected static final int DEFAULT_TEXTBOX_SIZE = 255; @UiField public DockLayoutPanel dockPanel; @UiField public VerticalPanel northPanel; @UiField public HorizontalPanel topPanel; @UiField public Label subTitleLabel; @UiField public FlexTable detailsTable; @UiField public HTMLPanel requiredFieldsNoteLabel; @UiField(provided = true) public final AlertPanel errorPanel; @UiField public FlowPanel footer; @UiField(provided = true) public final KaaAdminStyle kaaAdminStyle; @UiField(provided = true) public final AvroUiStyle avroUiStyle; protected final boolean create; private boolean hasChanged = false; protected Presenter presenter; protected final boolean editable; public BaseDetailsViewImpl(boolean create) { this(create, true); } public BaseDetailsViewImpl(boolean create, boolean editable) { this.create = create; this.editable = editable; errorPanel = new AlertPanel(Type.ERROR); kaaAdminStyle = Utils.kaaAdminStyle; avroUiStyle = Utils.avroUiStyle; initWidget(uiBinder.createAndBindUi(this)); constructTopPanel(); getTitileLabelWidget().setText(Utils.constants.title()); getSaveButtonWidget().setText(Utils.constants.save()); getCancelButtonWidget().setText(Utils.constants.cancel()); requiredFieldsNoteLabel.getElement().setInnerSafeHtml(SafeHtmlUtils .fromSafeConstant(Utils.messages.requiredFieldsNote(Utils.avroUiStyle.requiredField()))); if (create) { getTitileLabelWidget().setText(getCreateTitle()); getCancelButtonWidget().setVisible(true); } else { getTitileLabelWidget().setText(getViewTitle()); getBackButtonPanelWidget().setVisible(true); } subTitleLabel.setText(getSubTitle()); updateSaveButton(false, false); detailsTable.getColumnFormatter().setWidth(0, "200px"); detailsTable.getColumnFormatter().setWidth(1, "300px"); if (!create) { detailsTable.getColumnFormatter().setWidth(2, "300px"); } getSaveButtonWidget().addClickHandler(new ClickHandler() { @Override public void onClick(ClickEvent event) { updateSaveButton(false, false); hasChanged = false; } }); getSaveButtonWidget().setVisible(editable); requiredFieldsNoteLabel.setVisible(editable); initDetailsTable(); clearError(); } protected void updateNorthSize(int sizePx) { dockPanel.setWidgetSize(northPanel, sizePx); } protected Widget getBackButtonPanelWidget() { return backButtonPanelWidget; } protected Button getBackButtonWidget() { return backButtonWidget; } protected Label getTitileLabelWidget() { return titleLabelWidget; } protected Button getSaveButtonWidget() { return saveButtonWidget; } protected Button getCancelButtonWidget() { return cancelButtonWidget; } private Widget backButtonPanelWidget; private Button backButtonWidget; private Label titleLabelWidget; private Button saveButtonWidget; private Button cancelButtonWidget; protected void constructTopPanel() { FlowPanel panel = new FlowPanel(); panel.setSize("100%", "100%"); topPanel.setHorizontalAlignment(HasHorizontalAlignment.ALIGN_LEFT); topPanel.setVerticalAlignment(HasVerticalAlignment.ALIGN_MIDDLE); topPanel.add(panel); topPanel.setCellHeight(panel, "100%"); HorizontalPanel horizontalPanel = new HorizontalPanel(); horizontalPanel.setHeight("100%"); panel.add(horizontalPanel); HorizontalPanel backButtonPanel = new HorizontalPanel(); backButtonPanel.setHeight("100%"); backButtonPanel.addStyleName(Utils.kaaAdminStyle.bAppPaddedPanel()); backButtonPanel.setVisible(false); horizontalPanel.setHorizontalAlignment(HasHorizontalAlignment.ALIGN_LEFT); horizontalPanel.setVerticalAlignment(HasVerticalAlignment.ALIGN_MIDDLE); horizontalPanel.add(backButtonPanel); horizontalPanel.setCellHeight(backButtonPanel, "100%"); backButtonPanelWidget = backButtonPanel; Button backButton = new Button(); backButton.addStyleName(Utils.kaaAdminStyle.bAppBackButton()); backButtonPanel.setHorizontalAlignment(HasHorizontalAlignment.ALIGN_LEFT); backButtonPanel.setVerticalAlignment(HasVerticalAlignment.ALIGN_MIDDLE); backButtonPanel.add(backButton); backButtonPanel.setCellHeight(backButton, "100%"); backButtonWidget = backButton; Label titleLabel = new Label(); titleLabel.addStyleName(Utils.kaaAdminStyle.bAppContentTitle()); horizontalPanel.setHorizontalAlignment(HasHorizontalAlignment.ALIGN_LEFT); horizontalPanel.setVerticalAlignment(HasVerticalAlignment.ALIGN_MIDDLE); horizontalPanel.add(titleLabel); horizontalPanel.setCellHeight(titleLabel, "100%"); titleLabelWidget = titleLabel; HorizontalPanel buttonsPanel = new HorizontalPanel(); buttonsPanel.setHeight("100%"); buttonsPanel.addStyleName(Utils.avroUiStyle.buttonsPanel()); horizontalPanel.setHorizontalAlignment(HasHorizontalAlignment.ALIGN_LEFT); horizontalPanel.setVerticalAlignment(HasVerticalAlignment.ALIGN_MIDDLE); horizontalPanel.add(buttonsPanel); horizontalPanel.setCellHeight(buttonsPanel, "100%"); Button saveButton = new Button(); buttonsPanel.setHorizontalAlignment(HasHorizontalAlignment.ALIGN_LEFT); buttonsPanel.setVerticalAlignment(HasVerticalAlignment.ALIGN_MIDDLE); buttonsPanel.add(saveButton); buttonsPanel.setCellHeight(saveButton, "100%"); saveButtonWidget = saveButton; Button cancelButton = new Button(); cancelButton.setVisible(false); buttonsPanel.setHorizontalAlignment(HasHorizontalAlignment.ALIGN_LEFT); buttonsPanel.setVerticalAlignment(HasVerticalAlignment.ALIGN_MIDDLE); buttonsPanel.add(cancelButton); buttonsPanel.setCellHeight(cancelButton, "100%"); cancelButtonWidget = cancelButton; } @Override public void reset() { clearError(); resetImpl(); updateSaveButton(false, false); hasChanged = false; } @Override public boolean hasChanged() { return hasChanged; } @Override public void setBackEnabled(boolean enabled) { getBackButtonPanelWidget().setVisible(!create && enabled); } @Override public void setCancelEnabled(boolean enabled) { getCancelButtonWidget().setVisible(create && enabled); } @Override public HasClickHandlers getBackButton() { return getBackButtonWidget(); } @Override public HasClickHandlers getSaveButton() { return getSaveButtonWidget(); } @Override public HasClickHandlers getCancelButton() { return getCancelButtonWidget(); } @Override public void setPresenter(Presenter presenter) { this.presenter = presenter; } @Override public void setTitle(String title) { getTitileLabelWidget().setText(title); } @Override public void clearError() { errorPanel.setMessage(""); errorPanel.setVisible(false); } @Override public void setErrorMessage(String message) { errorPanel.setMessage(message); errorPanel.setVisible(true); } @Override public void onInputChanged(InputEvent event) { fireChanged(); } @Override public void onChange(ChangeEvent event) { fireChanged(); } protected void fireChanged() { boolean valid = true; valid &= validate(); updateSaveButton(valid, !valid); hasChanged = true; } protected abstract String getCreateTitle(); protected abstract String getViewTitle(); protected abstract String getSubTitle(); protected abstract void initDetailsTable(); protected abstract void resetImpl(); protected abstract boolean validate(); protected void updateSaveButton(boolean enabled, boolean invalid) { if (create || invalid) { getSaveButtonWidget().setText(create ? Utils.constants.add() : Utils.constants.save()); } else { getSaveButtonWidget().setText(enabled ? Utils.constants.save() : Utils.constants.saved()); } getSaveButtonWidget().setEnabled(enabled); } protected FlowPanel getFooter() { return footer; } }