Java tutorial
/* * Copyright 2000-2018 Vaadin Ltd. * * 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.vaadin.client.ui.gridlayout; import java.util.Map.Entry; import com.google.gwt.user.client.ui.Widget; import com.vaadin.client.ComponentConnector; import com.vaadin.client.ConnectorHierarchyChangeEvent; import com.vaadin.client.DirectionalManagedLayout; import com.vaadin.client.VCaption; import com.vaadin.client.communication.StateChangeEvent; import com.vaadin.client.ui.AbstractComponentContainerConnector; import com.vaadin.client.ui.LayoutClickEventHandler; import com.vaadin.client.ui.VGridLayout; import com.vaadin.client.ui.VGridLayout.Cell; import com.vaadin.client.ui.layout.VLayoutSlot; import com.vaadin.shared.Connector; import com.vaadin.shared.ui.Connect; import com.vaadin.shared.ui.LayoutClickRpc; import com.vaadin.shared.ui.MarginInfo; import com.vaadin.shared.ui.gridlayout.GridLayoutServerRpc; import com.vaadin.shared.ui.gridlayout.GridLayoutState; import com.vaadin.shared.ui.gridlayout.GridLayoutState.ChildComponentData; import com.vaadin.ui.GridLayout; @Connect(GridLayout.class) public class GridLayoutConnector extends AbstractComponentContainerConnector implements DirectionalManagedLayout { private static boolean fontLoadingCallbackRegistered = false; private LayoutClickEventHandler clickEventHandler = new LayoutClickEventHandler(this) { @Override protected ComponentConnector getChildComponent(com.google.gwt.user.client.Element element) { return getWidget().getComponent(element); } @Override protected LayoutClickRpc getLayoutClickRPC() { return getRpcProxy(GridLayoutServerRpc.class); } }; @Override public void init() { super.init(); getWidget().client = getConnection(); getLayoutManager().registerDependency(this, getWidget().spacingMeasureElement); if (!fontLoadingCallbackRegistered) { fontLoadingCallbackRegistered = true; registerFontLoadedCallback(); } } private static native void registerFontLoadedCallback() /*-{ try { if (!$doc.fonts) { // perform delayed forced refresh setTimeout(function() { $wnd.vaadin.forceLayout(); }, 300); } else if ($doc.fonts.status == 'loading') { $doc.fonts.ready.then(function () { $wnd.vaadin.forceLayout(); }); } } catch(err) { // just rely on the normal rendering being close to correct } }-*/; @Override public void onUnregister() { VGridLayout layout = getWidget(); getLayoutManager().unregisterDependency(this, layout.spacingMeasureElement); // Unregister caption size dependencies for (ComponentConnector child : getChildComponents()) { Cell cell = layout.widgetToCell.get(child.getWidget()); cell.slot.setCaption(null); } } @Override public GridLayoutState getState() { return (GridLayoutState) super.getState(); } @Override public void onStateChanged(StateChangeEvent stateChangeEvent) { super.onStateChanged(stateChangeEvent); clickEventHandler.handleEventHandlerRegistration(); getWidget().hideEmptyRowsAndColumns = getState().hideEmptyRowsAndColumns; initSize(); for (Entry<Connector, ChildComponentData> entry : getState().childData.entrySet()) { ComponentConnector child = (ComponentConnector) entry.getKey(); Cell cell = getCell(child); ChildComponentData childComponentData = entry.getValue(); cell.updateCell(childComponentData); } VGridLayout layout = getWidget(); layout.colExpandRatioArray = getState().colExpand; layout.rowExpandRatioArray = getState().rowExpand; layout.updateMarginStyleNames(new MarginInfo(getState().marginsBitmask)); layout.updateSpacingStyleName(getState().spacing); getLayoutManager().setNeedsLayout(this); } private Cell getCell(ComponentConnector child) { VGridLayout layout = getWidget(); Cell cell = layout.widgetToCell.get(child.getWidget()); if (cell == null) { ChildComponentData childComponentData = getState().childData.get(child); int row = childComponentData.row1; int col = childComponentData.column1; cell = layout.createNewCell(row, col); } return cell; } @Override public void onConnectorHierarchyChange(ConnectorHierarchyChangeEvent event) { VGridLayout layout = getWidget(); // clean non rendered components for (ComponentConnector oldChild : event.getOldChildren()) { if (oldChild.getParent() == this) { continue; } Widget childWidget = oldChild.getWidget(); layout.remove(childWidget); } initSize(); for (ComponentConnector componentConnector : getChildComponents()) { Cell cell = getCell(componentConnector); cell.setComponent(componentConnector, getChildComponents()); } } private void initSize() { VGridLayout layout = getWidget(); int cols = getState().columns; int rows = getState().rows; layout.columnWidths = new int[cols]; layout.rowHeights = new int[rows]; layout.explicitRowRatios = getState().explicitRowRatios; layout.explicitColRatios = getState().explicitColRatios; layout.setSize(rows, cols); } @Override public void updateCaption(ComponentConnector childConnector) { VGridLayout layout = getWidget(); Cell cell = layout.widgetToCell.get(childConnector.getWidget()); if (VCaption.isNeeded(childConnector)) { VLayoutSlot layoutSlot = cell.slot; VCaption caption = layoutSlot.getCaption(); if (caption == null) { caption = new VCaption(childConnector, getConnection()); Widget widget = childConnector.getWidget(); layout.setCaption(widget, caption); } caption.updateCaption(); } else { layout.setCaption(childConnector.getWidget(), null); getLayoutManager().setNeedsLayout(this); } } @Override public VGridLayout getWidget() { return (VGridLayout) super.getWidget(); } @Override public void layoutVertically() { getWidget().updateHeight(); } @Override public void layoutHorizontally() { getWidget().updateWidth(); } @Override protected void updateWidgetSize(String newWidth, String newHeight) { // Prevent the element from momentarily shrinking to zero size // when the size is set to undefined by a state change but before // it is recomputed in the layout phase. This may affect scroll // position in some cases; see #13386. if (!isUndefinedHeight()) { getWidget().setHeight(newHeight); } if (!isUndefinedWidth()) { getWidget().setWidth(newWidth); } } }