Java tutorial
/******************************************************************************* * Copyright (c) 2000, 2017 IBM Corporation and others. * * This program and the accompanying materials * are made available under the terms of the Eclipse Public License 2.0 * which accompanies this distribution, and is available at * https://www.eclipse.org/legal/epl-2.0/ * * SPDX-License-Identifier: EPL-2.0 * * Contributors: * IBM Corporation - initial API and implementation *******************************************************************************/ package org.eclipse.swt.examples.controlexample; import static org.eclipse.swt.events.SelectionListener.widgetSelectedAdapter; import org.eclipse.swt.SWT; import org.eclipse.swt.events.ControlListener; import org.eclipse.swt.graphics.Rectangle; import org.eclipse.swt.layout.FillLayout; import org.eclipse.swt.layout.GridData; import org.eclipse.swt.widgets.Button; import org.eclipse.swt.widgets.Composite; import org.eclipse.swt.widgets.Group; import org.eclipse.swt.widgets.List; import org.eclipse.swt.widgets.Sash; import org.eclipse.swt.widgets.Text; import org.eclipse.swt.widgets.Widget; class SashTab extends Tab { /* Example widgets and groups that contain them */ Sash hSash, vSash; Composite sashComp; Group sashGroup; List list1, list2, list3; Text text; Button smoothButton; static String[] ListData0 = { ControlExample.getResourceString("ListData0_0"), ControlExample.getResourceString("ListData0_1"), ControlExample.getResourceString("ListData0_2"), ControlExample.getResourceString("ListData0_3"), ControlExample.getResourceString("ListData0_4"), ControlExample.getResourceString("ListData0_5"), ControlExample.getResourceString("ListData0_6"), ControlExample.getResourceString("ListData0_7"), ControlExample.getResourceString("ListData0_8") }; static String[] ListData1 = { ControlExample.getResourceString("ListData1_0"), ControlExample.getResourceString("ListData1_1"), ControlExample.getResourceString("ListData1_2"), ControlExample.getResourceString("ListData1_3"), ControlExample.getResourceString("ListData1_4"), ControlExample.getResourceString("ListData1_5"), ControlExample.getResourceString("ListData1_6"), ControlExample.getResourceString("ListData1_7"), ControlExample.getResourceString("ListData1_8") }; /* Constants */ static final int SASH_WIDTH = 3; static final int SASH_LIMIT = 20; /** * Creates the Tab within a given instance of ControlExample. */ SashTab(ControlExample instance) { super(instance); } /** * Creates the "Example" group. */ @Override void createExampleGroup() { super.createExampleGroup(); exampleGroup.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true)); exampleGroup.setLayout(new FillLayout()); /* Create a group for the sash widgets */ sashGroup = new Group(exampleGroup, SWT.NONE); FillLayout layout = new FillLayout(); layout.marginHeight = layout.marginWidth = 5; sashGroup.setLayout(layout); sashGroup.setText("Sash"); } /** * Creates the "Example" widgets. */ @Override void createExampleWidgets() { /* * Create the page. This example does not use layouts. */ int style = getDefaultStyle(); sashComp = new Composite(sashGroup, SWT.BORDER | style); /* Create the list and text widgets */ list1 = new List(sashComp, SWT.V_SCROLL | SWT.H_SCROLL | SWT.BORDER); list1.setItems(ListData0); list2 = new List(sashComp, SWT.V_SCROLL | SWT.H_SCROLL | SWT.BORDER); list2.setItems(ListData1); text = new Text(sashComp, SWT.MULTI | SWT.BORDER); text.setText(ControlExample.getResourceString("Multi_line")); /* Create the sashes */ style = smoothButton.getSelection() ? SWT.SMOOTH : SWT.NONE; vSash = new Sash(sashComp, SWT.VERTICAL | style); hSash = new Sash(sashComp, SWT.HORIZONTAL | style); /* Add the listeners */ hSash.addSelectionListener(widgetSelectedAdapter(event -> { Rectangle rect = vSash.getParent().getClientArea(); event.y = Math.min(Math.max(event.y, SASH_LIMIT), rect.height - SASH_LIMIT); if (event.detail != SWT.DRAG) { hSash.setBounds(event.x, event.y, event.width, event.height); layout(); } })); vSash.addSelectionListener(widgetSelectedAdapter(event -> { Rectangle rect = vSash.getParent().getClientArea(); event.x = Math.min(Math.max(event.x, SASH_LIMIT), rect.width - SASH_LIMIT); if (event.detail != SWT.DRAG) { vSash.setBounds(event.x, event.y, event.width, event.height); layout(); } })); sashComp.addControlListener(ControlListener.controlResizedAdapter(e -> resized())); } /** * Creates the "Size" group. The "Size" group contains * controls that allow the user to change the size of * the example widgets. */ @Override void createSizeGroup() { } /** * Creates the "Style" group. */ @Override void createStyleGroup() { super.createStyleGroup(); /* Create the extra widgets */ smoothButton = new Button(styleGroup, SWT.CHECK); smoothButton.setText("SWT.SMOOTH"); } @Override void disposeExampleWidgets() { sashComp.dispose(); sashComp = null; } /** * Gets the "Example" widget children. */ @Override Widget[] getExampleWidgets() { return new Widget[] { hSash, vSash }; } /** * Returns a list of set/get API method names (without the set/get prefix) * that can be used to set/get values in the example control(s). */ @Override String[] getMethodNames() { return new String[] { "ToolTipText" }; } /** * Gets the text for the tab folder item. */ @Override String getTabText() { return "Sash"; } /** * Layout the list and text widgets according to the new * positions of the sashes..events.SelectionEvent */ void layout() { Rectangle clientArea = sashComp.getClientArea(); Rectangle hSashBounds = hSash.getBounds(); Rectangle vSashBounds = vSash.getBounds(); list1.setBounds(0, 0, vSashBounds.x, hSashBounds.y); list2.setBounds(vSashBounds.x + vSashBounds.width, 0, clientArea.width - (vSashBounds.x + vSashBounds.width), hSashBounds.y); text.setBounds(0, hSashBounds.y + hSashBounds.height, clientArea.width, clientArea.height - (hSashBounds.y + hSashBounds.height)); /** * If the horizontal sash has been moved then the vertical * sash is either too long or too short and its size must * be adjusted. */ vSashBounds.height = hSashBounds.y; vSash.setBounds(vSashBounds); } /** * Sets the size of the "Example" widgets. */ @Override void setExampleWidgetSize() { sashGroup.layout(true); } /** * Sets the state of the "Example" widgets. */ @Override void setExampleWidgetState() { super.setExampleWidgetState(); smoothButton.setSelection((hSash.getStyle() & SWT.SMOOTH) != 0); } /** * Handle the shell resized event. */ void resized() { /* Get the client area for the shell */ Rectangle clientArea = sashComp.getClientArea(); /* * Make list 1 half the width and half the height of the tab leaving room for the sash. * Place list 1 in the top left quadrant of the tab. */ Rectangle list1Bounds = new Rectangle(0, 0, (clientArea.width - SASH_WIDTH) / 2, (clientArea.height - SASH_WIDTH) / 2); list1.setBounds(list1Bounds); /* * Make list 2 half the width and half the height of the tab leaving room for the sash. * Place list 2 in the top right quadrant of the tab. */ list2.setBounds(list1Bounds.width + SASH_WIDTH, 0, clientArea.width - (list1Bounds.width + SASH_WIDTH), list1Bounds.height); /* * Make the text area the full width and half the height of the tab leaving room for the sash. * Place the text area in the bottom half of the tab. */ text.setBounds(0, list1Bounds.height + SASH_WIDTH, clientArea.width, clientArea.height - (list1Bounds.height + SASH_WIDTH)); /* Position the sashes */ vSash.setBounds(list1Bounds.width, 0, SASH_WIDTH, list1Bounds.height); hSash.setBounds(0, list1Bounds.height, clientArea.width, SASH_WIDTH); } }