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.MenuListener.menuHiddenAdapter; import static org.eclipse.swt.events.SelectionListener.widgetSelectedAdapter; import org.eclipse.swt.SWT; import org.eclipse.swt.events.SelectionAdapter; import org.eclipse.swt.events.SelectionEvent; import org.eclipse.swt.graphics.Image; import org.eclipse.swt.graphics.Point; import org.eclipse.swt.graphics.Rectangle; import org.eclipse.swt.layout.GridData; import org.eclipse.swt.layout.GridLayout; import org.eclipse.swt.widgets.Button; import org.eclipse.swt.widgets.Control; import org.eclipse.swt.widgets.CoolBar; import org.eclipse.swt.widgets.CoolItem; import org.eclipse.swt.widgets.Group; import org.eclipse.swt.widgets.Item; import org.eclipse.swt.widgets.Menu; import org.eclipse.swt.widgets.MenuItem; import org.eclipse.swt.widgets.Text; import org.eclipse.swt.widgets.ToolBar; import org.eclipse.swt.widgets.ToolItem; import org.eclipse.swt.widgets.Widget; class CoolBarTab extends Tab { /* Example widgets and group that contains them */ CoolBar coolBar; CoolItem pushItem, dropDownItem, radioItem, checkItem, textItem; Group coolBarGroup; /* Style widgets added to the "Style" group */ Button horizontalButton, verticalButton; Button dropDownButton, flatButton; /* Other widgets added to the "Other" group */ Button lockedButton; Point[] sizes; int[] wrapIndices; int[] order; /** * Creates the Tab within a given instance of ControlExample. */ CoolBarTab(ControlExample instance) { super(instance); } /** * Creates the "Other" group. */ @Override void createOtherGroup() { super.createOtherGroup(); /* Create display controls specific to this example */ lockedButton = new Button(otherGroup, SWT.CHECK); lockedButton.setText(ControlExample.getResourceString("Locked")); /* Add the listeners */ lockedButton.addSelectionListener(widgetSelectedAdapter(event -> setWidgetLocked())); } /** * Creates the "Example" group. */ @Override void createExampleGroup() { super.createExampleGroup(); coolBarGroup = new Group(exampleGroup, SWT.NONE); coolBarGroup.setLayout(new GridLayout()); coolBarGroup.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true)); coolBarGroup.setText("CoolBar"); } /** * Creates the "Example" widgets. */ @Override void createExampleWidgets() { int style = getDefaultStyle(), itemStyle = 0; /* Compute the widget, item, and item toolBar styles */ int toolBarStyle = SWT.FLAT; boolean vertical = false; if (horizontalButton.getSelection()) { style |= SWT.HORIZONTAL; toolBarStyle |= SWT.HORIZONTAL; } if (verticalButton.getSelection()) { style |= SWT.VERTICAL; toolBarStyle |= SWT.VERTICAL; vertical = true; } if (borderButton.getSelection()) style |= SWT.BORDER; if (flatButton.getSelection()) style |= SWT.FLAT; if (dropDownButton.getSelection()) itemStyle |= SWT.DROP_DOWN; /* * Create the example widgets. */ coolBar = new CoolBar(coolBarGroup, style); /* Create the push button toolbar cool item */ ToolBar toolBar = new ToolBar(coolBar, toolBarStyle); ToolItem item = new ToolItem(toolBar, SWT.PUSH); item.setImage(instance.images[ControlExample.ciClosedFolder]); item.setToolTipText("SWT.PUSH"); item = new ToolItem(toolBar, SWT.PUSH); item.setImage(instance.images[ControlExample.ciOpenFolder]); item.setToolTipText("SWT.PUSH"); item = new ToolItem(toolBar, SWT.PUSH); item.setImage(instance.images[ControlExample.ciTarget]); item.setToolTipText("SWT.PUSH"); item = new ToolItem(toolBar, SWT.SEPARATOR); item = new ToolItem(toolBar, SWT.PUSH); item.setImage(instance.images[ControlExample.ciClosedFolder]); item.setToolTipText("SWT.PUSH"); item = new ToolItem(toolBar, SWT.PUSH); item.setImage(instance.images[ControlExample.ciOpenFolder]); item.setToolTipText("SWT.PUSH"); pushItem = new CoolItem(coolBar, itemStyle); pushItem.setControl(toolBar); pushItem.addSelectionListener(new CoolItemSelectionListener()); /* Create the dropdown toolbar cool item */ toolBar = new ToolBar(coolBar, toolBarStyle); item = new ToolItem(toolBar, SWT.DROP_DOWN); item.setImage(instance.images[ControlExample.ciOpenFolder]); item.setToolTipText("SWT.DROP_DOWN"); item.addSelectionListener(new DropDownSelectionListener()); item = new ToolItem(toolBar, SWT.DROP_DOWN); item.setImage(instance.images[ControlExample.ciClosedFolder]); item.setToolTipText("SWT.DROP_DOWN"); item.addSelectionListener(new DropDownSelectionListener()); dropDownItem = new CoolItem(coolBar, itemStyle); dropDownItem.setControl(toolBar); dropDownItem.addSelectionListener(new CoolItemSelectionListener()); /* Create the radio button toolbar cool item */ toolBar = new ToolBar(coolBar, toolBarStyle); item = new ToolItem(toolBar, SWT.RADIO); item.setImage(instance.images[ControlExample.ciClosedFolder]); item.setToolTipText("SWT.RADIO"); item = new ToolItem(toolBar, SWT.RADIO); item.setImage(instance.images[ControlExample.ciClosedFolder]); item.setToolTipText("SWT.RADIO"); item = new ToolItem(toolBar, SWT.RADIO); item.setImage(instance.images[ControlExample.ciClosedFolder]); item.setToolTipText("SWT.RADIO"); radioItem = new CoolItem(coolBar, itemStyle); radioItem.setControl(toolBar); radioItem.addSelectionListener(new CoolItemSelectionListener()); /* Create the check button toolbar cool item */ toolBar = new ToolBar(coolBar, toolBarStyle); item = new ToolItem(toolBar, SWT.CHECK); item.setImage(instance.images[ControlExample.ciClosedFolder]); item.setToolTipText("SWT.CHECK"); item = new ToolItem(toolBar, SWT.CHECK); item.setImage(instance.images[ControlExample.ciTarget]); item.setToolTipText("SWT.CHECK"); item = new ToolItem(toolBar, SWT.CHECK); item.setImage(instance.images[ControlExample.ciOpenFolder]); item.setToolTipText("SWT.CHECK"); item = new ToolItem(toolBar, SWT.CHECK); item.setImage(instance.images[ControlExample.ciTarget]); item.setToolTipText("SWT.CHECK"); checkItem = new CoolItem(coolBar, itemStyle); checkItem.setControl(toolBar); checkItem.addSelectionListener(new CoolItemSelectionListener()); /* Create the text cool item */ if (!vertical) { Text text = new Text(coolBar, SWT.BORDER | SWT.SINGLE); textItem = new CoolItem(coolBar, itemStyle); textItem.setControl(text); textItem.addSelectionListener(new CoolItemSelectionListener()); Point textSize = text.computeSize(SWT.DEFAULT, SWT.DEFAULT); textSize = textItem.computeSize(textSize.x, textSize.y); textItem.setMinimumSize(textSize); textItem.setPreferredSize(textSize); textItem.setSize(textSize); } /* Set the sizes after adding all cool items */ CoolItem[] coolItems = coolBar.getItems(); for (CoolItem coolItem : coolItems) { Control control = coolItem.getControl(); Point size = control.computeSize(SWT.DEFAULT, SWT.DEFAULT); Point coolSize = coolItem.computeSize(size.x, size.y); if (control instanceof ToolBar) { ToolBar bar = (ToolBar) control; if (bar.getItemCount() > 0) { if (vertical) { size.y = bar.getItem(0).getBounds().height; } else { size.x = bar.getItem(0).getWidth(); } } } coolItem.setMinimumSize(size); coolItem.setPreferredSize(coolSize); coolItem.setSize(coolSize); } /* If we have saved state, restore it */ if (order != null && order.length == coolBar.getItemCount()) { coolBar.setItemLayout(order, wrapIndices, sizes); } else { coolBar.setWrapIndices(new int[] { 1, 3 }); } /* Add a listener to resize the group box to match the coolbar */ coolBar.addListener(SWT.Resize, event -> exampleGroup.layout()); } /** * Creates the "Style" group. */ @Override void createStyleGroup() { super.createStyleGroup(); /* Create the extra widgets */ horizontalButton = new Button(styleGroup, SWT.RADIO); horizontalButton.setText("SWT.HORIZONTAL"); verticalButton = new Button(styleGroup, SWT.RADIO); verticalButton.setText("SWT.VERTICAL"); borderButton = new Button(styleGroup, SWT.CHECK); borderButton.setText("SWT.BORDER"); flatButton = new Button(styleGroup, SWT.CHECK); flatButton.setText("SWT.FLAT"); Group itemGroup = new Group(styleGroup, SWT.NONE); itemGroup.setLayout(new GridLayout()); itemGroup.setLayoutData(new GridData(GridData.HORIZONTAL_ALIGN_FILL | GridData.VERTICAL_ALIGN_FILL)); itemGroup.setText(ControlExample.getResourceString("Item_Styles")); dropDownButton = new Button(itemGroup, SWT.CHECK); dropDownButton.setText("SWT.DROP_DOWN"); } /** * Disposes the "Example" widgets. */ @Override void disposeExampleWidgets() { /* store the state of the toolbar if applicable */ if (coolBar != null) { sizes = coolBar.getItemSizes(); wrapIndices = coolBar.getWrapIndices(); order = coolBar.getItemOrder(); } super.disposeExampleWidgets(); } /** * Gets the "Example" widget children's items, if any. * * @return an array containing the example widget children's items */ @Override Item[] getExampleWidgetItems() { return coolBar.getItems(); } /** * Gets the "Example" widget children. */ @Override Widget[] getExampleWidgets() { return new Widget[] { coolBar }; } /** * 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 short text for the tab folder item. */ @Override String getShortTabText() { return "CB"; } /** * Gets the text for the tab folder item. */ @Override String getTabText() { return "CoolBar"; } /** * Sets the state of the "Example" widgets. */ @Override void setExampleWidgetState() { super.setExampleWidgetState(); horizontalButton.setSelection((coolBar.getStyle() & SWT.HORIZONTAL) != 0); verticalButton.setSelection((coolBar.getStyle() & SWT.VERTICAL) != 0); borderButton.setSelection((coolBar.getStyle() & SWT.BORDER) != 0); flatButton.setSelection((coolBar.getStyle() & SWT.FLAT) != 0); dropDownButton.setSelection((coolBar.getItem(0).getStyle() & SWT.DROP_DOWN) != 0); lockedButton.setSelection(coolBar.getLocked()); if (!instance.startup) setWidgetLocked(); } /** * Sets the header visible state of the "Example" widgets. */ void setWidgetLocked() { coolBar.setLocked(lockedButton.getSelection()); } /** * Listens to widgetSelected() events on SWT.DROP_DOWN type ToolItems * and opens/closes a menu when appropriate. */ class DropDownSelectionListener extends SelectionAdapter { private Menu menu = null; private boolean visible = false; @Override public void widgetSelected(SelectionEvent event) { // Create the menu if it has not already been created if (menu == null) { // Lazy create the menu. menu = new Menu(shell, SWT.POP_UP | (coolBar.getStyle() & (SWT.RIGHT_TO_LEFT | SWT.LEFT_TO_RIGHT))); menu.addMenuListener(menuHiddenAdapter(e -> visible = false)); for (int i = 0; i < 9; ++i) { final String text = ControlExample.getResourceString("DropDownData_" + i); if (text.length() != 0) { MenuItem menuItem = new MenuItem(menu, SWT.NONE); menuItem.setText(text); /* * Add a menu selection listener so that the menu is hidden * when the user selects an item from the drop down menu. */ menuItem.addSelectionListener(widgetSelectedAdapter(e -> setMenuVisible(false))); } else { new MenuItem(menu, SWT.SEPARATOR); } } } /** * A selection event will be fired when a drop down tool * item is selected in the main area and in the drop * down arrow. Examine the event detail to determine * where the widget was selected. */ if (event.detail == SWT.ARROW) { /* * The drop down arrow was selected. */ if (visible) { // Hide the menu to give the Arrow the appearance of being a toggle button. setMenuVisible(false); } else { // Position the menu below and vertically aligned with the the drop down tool button. final ToolItem toolItem = (ToolItem) event.widget; final ToolBar toolBar = toolItem.getParent(); Rectangle toolItemBounds = toolItem.getBounds(); Point point = toolBar.toDisplay(new Point(toolItemBounds.x, toolItemBounds.y)); menu.setLocation(point.x, point.y + toolItemBounds.height); setMenuVisible(true); } } else { /* * Main area of drop down tool item selected. * An application would invoke the code to perform the action for the tool item. */ } } private void setMenuVisible(boolean visible) { menu.setVisible(visible); this.visible = visible; } } /** * Listens to widgetSelected() events on SWT.DROP_DOWN type CoolItems * and opens/closes a menu when appropriate. */ class CoolItemSelectionListener extends SelectionAdapter { private Menu menu = null; @Override public void widgetSelected(SelectionEvent event) { /** * A selection event will be fired when the cool item * is selected by its gripper or if the drop down arrow * (or 'chevron') is selected. Examine the event detail * to determine where the widget was selected. */ if (event.detail == SWT.ARROW) { /* If the popup menu is already up (i.e. user pressed arrow twice), * then dispose it. */ if (menu != null) { menu.dispose(); menu = null; return; } /* Get the cool item and convert its bounds to display coordinates. */ CoolItem coolItem = (CoolItem) event.widget; Rectangle itemBounds = coolItem.getBounds(); itemBounds.width = event.x - itemBounds.x; Point pt = coolBar.toDisplay(new Point(itemBounds.x, itemBounds.y)); itemBounds.x = pt.x; itemBounds.y = pt.y; /* Get the toolbar from the cool item. */ ToolBar toolBar = (ToolBar) coolItem.getControl(); ToolItem[] tools = toolBar.getItems(); int toolCount = tools.length; /* Convert the bounds of each tool item to display coordinates, * and determine which ones are past the bounds of the cool item. */ int i = 0; while (i < toolCount) { Rectangle toolBounds = tools[i].getBounds(); pt = toolBar.toDisplay(new Point(toolBounds.x, toolBounds.y)); toolBounds.x = pt.x; toolBounds.y = pt.y; Rectangle intersection = itemBounds.intersection(toolBounds); if (!intersection.equals(toolBounds)) break; i++; } /* Create a pop-up menu with items for each of the hidden buttons. */ menu = new Menu(shell, SWT.POP_UP | (coolBar.getStyle() & (SWT.RIGHT_TO_LEFT | SWT.LEFT_TO_RIGHT))); for (int j = i; j < toolCount; j++) { ToolItem tool = tools[j]; Image image = tool.getImage(); if (image == null) { new MenuItem(menu, SWT.SEPARATOR); } else { if ((tool.getStyle() & SWT.DROP_DOWN) != 0) { MenuItem menuItem = new MenuItem(menu, SWT.CASCADE); menuItem.setImage(image); String text = tool.getToolTipText(); if (text != null) menuItem.setText(text); Menu m = new Menu(menu); menuItem.setMenu(m); for (int k = 0; k < 9; ++k) { text = ControlExample.getResourceString("DropDownData_" + k); if (text.length() != 0) { MenuItem mi = new MenuItem(m, SWT.NONE); mi.setText(text); /* Application code to perform the action for the submenu item would go here. */ } else { new MenuItem(m, SWT.SEPARATOR); } } } else { MenuItem menuItem = new MenuItem(menu, SWT.NONE); menuItem.setImage(image); String text = tool.getToolTipText(); if (text != null) menuItem.setText(text); } /* Application code to perform the action for the menu item would go here. */ } } /* Display the pop-up menu at the lower left corner of the arrow button. * Dispose the menu when the user is done with it. */ pt = coolBar.toDisplay(new Point(event.x, event.y)); menu.setLocation(pt.x, pt.y); menu.setVisible(true); while (menu != null && !menu.isDisposed() && menu.isVisible()) { if (!display.readAndDispatch()) display.sleep(); } if (menu != null) { menu.dispose(); menu = null; } } } } }