Java tutorial
/******************************************************************************* * Copyright (c) 2000, 2019 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 java.io.IOException; import java.io.InputStream; import org.eclipse.swt.SWT; import org.eclipse.swt.custom.MovementEvent; import org.eclipse.swt.custom.MovementListener; import org.eclipse.swt.custom.StyleRange; import org.eclipse.swt.custom.StyledText; import org.eclipse.swt.custom.TextChangeListener; import org.eclipse.swt.custom.TextChangedEvent; import org.eclipse.swt.custom.TextChangingEvent; import org.eclipse.swt.events.ControlListener; import org.eclipse.swt.events.SelectionListener; import org.eclipse.swt.graphics.Color; import org.eclipse.swt.graphics.Image; import org.eclipse.swt.graphics.ImageData; import org.eclipse.swt.graphics.Point; import org.eclipse.swt.layout.GridData; import org.eclipse.swt.layout.GridLayout; import org.eclipse.swt.widgets.Button; import org.eclipse.swt.widgets.Composite; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.Group; import org.eclipse.swt.widgets.Label; import org.eclipse.swt.widgets.TabFolder; import org.eclipse.swt.widgets.Widget; class StyledTextTab extends ScrollableTab { /* Example widgets and groups that contain them */ StyledText styledText; Group styledTextGroup, styledTextStyleGroup; /* Style widgets added to the "Style" group */ Button wrapButton, readOnlyButton, fullSelectionButton; /* Buttons for adding StyleRanges to StyledText */ Button boldButton, italicButton, redButton, yellowButton, underlineButton, strikeoutButton, resetButton; Image boldImage, italicImage, redImage, yellowImage, underlineImage, strikeoutImage; /* Other widgets added to the "Other" group */ Button mouseNavigatorButton; /* Variables for saving state. */ String text; StyleRange[] styleRanges; /** * Creates the Tab within a given instance of ControlExample. */ StyledTextTab(ControlExample instance) { super(instance); } /** * Creates a bitmap image. */ Image createBitmapImage(Display display, String name) { InputStream sourceStream = ControlExample.class.getResourceAsStream(name + ".bmp"); InputStream maskStream = ControlExample.class.getResourceAsStream(name + "_mask.bmp"); ImageData source = new ImageData(sourceStream); ImageData mask = new ImageData(maskStream); Image result = new Image(display, source, mask); try { sourceStream.close(); maskStream.close(); } catch (IOException e) { e.printStackTrace(); } return result; } /** * Creates the "Control" widget children. */ @Override void createControlWidgets() { super.createControlWidgets(); /* Add a group for modifying the StyledText widget */ createStyledTextStyleGroup(); } /** * Creates the "Example" group. */ @Override void createExampleGroup() { super.createExampleGroup(); /* Create a group for the styled text widget */ styledTextGroup = new Group(exampleGroup, SWT.NONE); styledTextGroup.setLayout(new GridLayout()); styledTextGroup.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true)); styledTextGroup.setText("StyledText"); } /** * Creates the "Example" widgets. */ @Override void createExampleWidgets() { /* Compute the widget style */ int style = getDefaultStyle(); if (singleButton.getSelection()) style |= SWT.SINGLE; if (multiButton.getSelection()) style |= SWT.MULTI; if (horizontalButton.getSelection()) style |= SWT.H_SCROLL; if (verticalButton.getSelection()) style |= SWT.V_SCROLL; if (wrapButton.getSelection()) style |= SWT.WRAP; if (readOnlyButton.getSelection()) style |= SWT.READ_ONLY; if (borderButton.getSelection()) style |= SWT.BORDER; if (fullSelectionButton.getSelection()) style |= SWT.FULL_SELECTION; /* Create the example widgets */ styledText = new StyledText(styledTextGroup, style); styledText.setText(ControlExample.getResourceString("Example_string")); styledText.append("\n"); styledText.append(ControlExample.getResourceString("One_Two_Three")); if (text != null) { styledText.setText(text); text = null; } if (styleRanges != null) { styledText.setStyleRanges(styleRanges); styleRanges = null; } } /** * Creates the "Style" group. */ @Override void createStyleGroup() { super.createStyleGroup(); /* Create the extra widgets */ wrapButton = new Button(styleGroup, SWT.CHECK); wrapButton.setText("SWT.WRAP"); readOnlyButton = new Button(styleGroup, SWT.CHECK); readOnlyButton.setText("SWT.READ_ONLY"); fullSelectionButton = new Button(styleGroup, SWT.CHECK); fullSelectionButton.setText("SWT.FULL_SELECTION"); } /** * Creates the "StyledText Style" group. */ void createStyledTextStyleGroup() { styledTextStyleGroup = new Group(controlGroup, SWT.NONE); styledTextStyleGroup.setText(ControlExample.getResourceString("StyledText_Styles")); styledTextStyleGroup.setLayout(new GridLayout(6, false)); GridData data = new GridData(GridData.HORIZONTAL_ALIGN_FILL); data.horizontalSpan = 2; styledTextStyleGroup.setLayoutData(data); /* Get images */ boldImage = createBitmapImage(display, "bold"); italicImage = createBitmapImage(display, "italic"); redImage = createBitmapImage(display, "red"); yellowImage = createBitmapImage(display, "yellow"); underlineImage = createBitmapImage(display, "underline"); strikeoutImage = createBitmapImage(display, "strikeout"); /* Create controls to modify the StyledText */ Label label = new Label(styledTextStyleGroup, SWT.NONE); label.setText(ControlExample.getResourceString("StyledText_Style_Instructions")); label.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, false, 4, 1)); resetButton = new Button(styledTextStyleGroup, SWT.PUSH); resetButton.setText(ControlExample.getResourceString("Clear")); resetButton.setLayoutData(new GridData(SWT.END, SWT.CENTER, true, false, 2, 1)); label = new Label(styledTextStyleGroup, SWT.NONE); label.setText(ControlExample.getResourceString("Bold")); label.setLayoutData(new GridData(SWT.END, SWT.CENTER, true, false)); boldButton = new Button(styledTextStyleGroup, SWT.PUSH); boldButton.setImage(boldImage); label = new Label(styledTextStyleGroup, SWT.NONE); label.setText(ControlExample.getResourceString("Underline")); label.setLayoutData(new GridData(SWT.END, SWT.CENTER, true, false)); underlineButton = new Button(styledTextStyleGroup, SWT.PUSH); underlineButton.setImage(underlineImage); label = new Label(styledTextStyleGroup, SWT.NONE); label.setText(ControlExample.getResourceString("Foreground_Style")); label.setLayoutData(new GridData(SWT.END, SWT.CENTER, true, false)); redButton = new Button(styledTextStyleGroup, SWT.PUSH); redButton.setImage(redImage); label = new Label(styledTextStyleGroup, SWT.NONE); label.setText(ControlExample.getResourceString("Italic")); label.setLayoutData(new GridData(SWT.END, SWT.CENTER, true, false)); italicButton = new Button(styledTextStyleGroup, SWT.PUSH); italicButton.setImage(italicImage); label = new Label(styledTextStyleGroup, SWT.NONE); label.setText(ControlExample.getResourceString("Strikeout")); label.setLayoutData(new GridData(SWT.END, SWT.CENTER, true, false)); strikeoutButton = new Button(styledTextStyleGroup, SWT.PUSH); strikeoutButton.setImage(strikeoutImage); label = new Label(styledTextStyleGroup, SWT.NONE); label.setText(ControlExample.getResourceString("Background_Style")); label.setLayoutData(new GridData(SWT.END, SWT.CENTER, true, false)); yellowButton = new Button(styledTextStyleGroup, SWT.PUSH); yellowButton.setImage(yellowImage); SelectionListener styleListener = widgetSelectedAdapter(e -> { Point sel = styledText.getSelectionRange(); if ((sel == null) || (sel.y == 0)) return; StyleRange style; for (int i = sel.x; i < sel.x + sel.y; i++) { StyleRange range = styledText.getStyleRangeAtOffset(i); if (range != null && e.widget != resetButton) { style = (StyleRange) range.clone(); style.start = i; style.length = 1; } else { style = new StyleRange(i, 1, null, null, SWT.NORMAL); } if (e.widget == boldButton) { style.fontStyle ^= SWT.BOLD; } else if (e.widget == italicButton) { style.fontStyle ^= SWT.ITALIC; } else if (e.widget == underlineButton) { style.underline = !style.underline; } else if (e.widget == strikeoutButton) { style.strikeout = !style.strikeout; } styledText.setStyleRange(style); } styledText.setSelectionRange(sel.x + sel.y, 0); }); SelectionListener colorListener = widgetSelectedAdapter(e -> { Point sel = styledText.getSelectionRange(); if ((sel == null) || (sel.y == 0)) return; Color fg = null, bg = null; if (e.widget == redButton) { fg = display.getSystemColor(SWT.COLOR_RED); } else if (e.widget == yellowButton) { bg = display.getSystemColor(SWT.COLOR_YELLOW); } StyleRange style; for (int i = sel.x; i < sel.x + sel.y; i++) { StyleRange range = styledText.getStyleRangeAtOffset(i); if (range != null) { style = (StyleRange) range.clone(); style.start = i; style.length = 1; if (fg != null) style.foreground = style.foreground != null ? null : fg; if (bg != null) style.background = style.background != null ? null : bg; } else { style = new StyleRange(i, 1, fg, bg, SWT.NORMAL); } styledText.setStyleRange(style); } styledText.setSelectionRange(sel.x + sel.y, 0); }); resetButton.addSelectionListener(styleListener); boldButton.addSelectionListener(styleListener); italicButton.addSelectionListener(styleListener); underlineButton.addSelectionListener(styleListener); strikeoutButton.addSelectionListener(styleListener); redButton.addSelectionListener(colorListener); yellowButton.addSelectionListener(colorListener); yellowButton.addDisposeListener(e -> { boldImage.dispose(); italicImage.dispose(); redImage.dispose(); yellowImage.dispose(); underlineImage.dispose(); strikeoutImage.dispose(); }); } /** * Creates the tab folder page. * * @param tabFolder org.eclipse.swt.widgets.TabFolder * @return the new page for the tab folder */ @Override Composite createTabFolderPage(TabFolder tabFolder) { super.createTabFolderPage(tabFolder); /* * Add a resize listener to the tabFolderPage so that * if the user types into the example widget to change * its preferred size, and then resizes the shell, we * recalculate the preferred size correctly. */ tabFolderPage.addControlListener(ControlListener.controlResizedAdapter(e -> setExampleWidgetSize())); return tabFolderPage; } /** * Creates the "Other" group. */ @Override void createOtherGroup() { super.createOtherGroup(); /* Create display controls specific to this example */ mouseNavigatorButton = new Button(otherGroup, SWT.CHECK); mouseNavigatorButton.setText(ControlExample.getResourceString("Mouse_Nav")); mouseNavigatorButton.addSelectionListener(widgetSelectedAdapter( event -> styledText.setMouseNavigatorEnabled(mouseNavigatorButton.getSelection()))); } /** * Disposes the "Example" widgets. */ @Override void disposeExampleWidgets() { /* store the state of the styledText if applicable */ if (styledText != null) { styleRanges = styledText.getStyleRanges(); text = styledText.getText(); } super.disposeExampleWidgets(); } /** * Gets the list of custom event names. * * @return an array containing custom event names */ @Override String[] getCustomEventNames() { return new String[] { "ExtendedModifyListener", "BidiSegmentListener", "LineBackgroundListener", "LineStyleListener", "PaintObjectListener", "TextChangeListener", "VerifyKeyListener", "WordMovementListener" }; } /** * Gets the "Example" widget children. */ @Override Widget[] getExampleWidgets() { return new Widget[] { styledText }; } /** * 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[] { "Alignment", "AlwaysShowScrollBars", "BlockSelection", "BottomMargin", "CaretOffset", "DoubleClickEnabled", "Editable", "HorizontalIndex", "HorizontalPixel", "Indent", "Justify", "LeftMargin", "LineSpacing", "Orientation", "RightMargin", "Selection", "Tabs", "TabStops", "Text", "TextLimit", "ToolTipText", "TopIndex", "TopMargin", "TopPixel", "WrapIndent", "WordWrap" }; } /** * Gets the text for the tab folder item. */ @Override String getTabText() { return "StyledText"; } /** * Hooks the custom listener specified by eventName. */ @Override void hookCustomListener(final String eventName) { if (eventName == "ExtendedModifyListener") { styledText.addExtendedModifyListener(event -> log(eventName, event)); } if (eventName == "BidiSegmentListener") { styledText.addBidiSegmentListener(event -> log(eventName, event)); } if (eventName == "LineBackgroundListener") { styledText.addLineBackgroundListener(event -> log(eventName, event)); } if (eventName == "LineStyleListener") { styledText.addLineStyleListener(event -> log(eventName, event)); } if (eventName == "PaintObjectListener") { styledText.addPaintObjectListener(event -> log(eventName, event)); } if (eventName == "TextChangeListener") { styledText.getContent().addTextChangeListener(new TextChangeListener() { @Override public void textChanged(TextChangedEvent event) { log(eventName + ".textChanged", event); } @Override public void textChanging(TextChangingEvent event) { log(eventName + ".textChanging", event); } @Override public void textSet(TextChangedEvent event) { log(eventName + ".textSet", event); } }); } if (eventName == "VerifyKeyListener") { styledText.addVerifyKeyListener(event -> log(eventName, event)); } if (eventName == "WordMovementListener") { styledText.addWordMovementListener(new MovementListener() { @Override public void getNextOffset(MovementEvent event) { log(eventName + ".getNextOffset", event); } @Override public void getPreviousOffset(MovementEvent event) { log(eventName + ".getPreviousOffset", event); } }); } } /** * Sets the state of the "Example" widgets. */ @Override void setExampleWidgetState() { super.setExampleWidgetState(); wrapButton.setSelection((styledText.getStyle() & SWT.WRAP) != 0); readOnlyButton.setSelection((styledText.getStyle() & SWT.READ_ONLY) != 0); fullSelectionButton.setSelection((styledText.getStyle() & SWT.FULL_SELECTION) != 0); horizontalButton.setEnabled((styledText.getStyle() & SWT.MULTI) != 0); verticalButton.setEnabled((styledText.getStyle() & SWT.MULTI) != 0); wrapButton.setEnabled((styledText.getStyle() & SWT.MULTI) != 0); } }