Java tutorial
/******************************************************************************* * Copyright (c) 2007, 2012 Wind River Systems, Inc. and others. * All rights reserved. This program and the accompanying materials * are made available under the terms of the Eclipse Public License v1.0 * which accompanies this distribution, and is available at * http://www.eclipse.org/legal/epl-v10.html * * Contributors: * Anton Leherbauer (Wind River Systems) - initial API and implementation *******************************************************************************/ package org.eclipse.cdt.internal.ui.text; import org.eclipse.compare.CompareConfiguration; import org.eclipse.compare.CompareUI; import org.eclipse.compare.structuremergeviewer.ICompareInput; import org.eclipse.jface.action.ToolBarManager; import org.eclipse.jface.preference.IPreferenceStore; import org.eclipse.jface.preference.PreferenceConverter; import org.eclipse.jface.resource.JFaceResources; import org.eclipse.jface.text.IInformationControlCreator; import org.eclipse.jface.text.IInformationControlExtension2; import org.eclipse.jface.viewers.Viewer; import org.eclipse.swt.SWT; import org.eclipse.swt.custom.ViewForm; import org.eclipse.swt.events.DisposeEvent; import org.eclipse.swt.events.DisposeListener; import org.eclipse.swt.events.MouseAdapter; import org.eclipse.swt.events.MouseEvent; import org.eclipse.swt.events.MouseMoveListener; import org.eclipse.swt.graphics.Color; import org.eclipse.swt.graphics.Font; import org.eclipse.swt.graphics.GC; import org.eclipse.swt.graphics.Point; import org.eclipse.swt.graphics.RGB; import org.eclipse.swt.graphics.Rectangle; import org.eclipse.swt.layout.GridData; import org.eclipse.swt.layout.GridLayout; import org.eclipse.swt.widgets.Composite; import org.eclipse.swt.widgets.Control; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.Label; import org.eclipse.swt.widgets.Shell; import org.eclipse.cdt.ui.CUIPlugin; import org.eclipse.cdt.ui.PreferenceConstants; import org.eclipse.cdt.internal.ui.text.c.hover.SourceViewerInformationControl; /** * Abstract class for "quick" compare views in light-weight controls. * * @since 5.0 */ public abstract class AbstractCompareViewerInformationControl extends org.eclipse.jface.text.AbstractInformationControl implements IInformationControlExtension2, DisposeListener { protected class CompareViewerControl extends ViewForm { private CompareConfiguration fCompareConfiguration; private Viewer fViewer; public CompareViewerControl(Composite parent, int styles, CompareConfiguration cc) { super(parent, styles & ~SWT.BORDER); verticalSpacing = 0; fCompareConfiguration = cc; } public CompareConfiguration getCompareConfiguration() { return fCompareConfiguration; } public void setInput(ICompareInput input) { if (fViewer == null) { fViewer = createContentViewer(this, input, fCompareConfiguration); setContent(fViewer.getControl()); } fViewer.setInput(input); } } private CompareViewerControl fCompareViewerControl; private ICompareInput fCompareInput; private Color fBackgroundColor; private boolean fIsSystemBackgroundColor = true; private Label fTitleLabel; /** * Creates a compare viewer information control with the given shell as parent. * * @param parent the parent shell * @param isResizable flag indicating whether the control is resizable */ public AbstractCompareViewerInformationControl(Shell parent, boolean isResizable) { super(parent, isResizable); // Create all controls create(); } /** * Creates a compare viewer information control with the given shell as parent. * * @param parent * @param toolBarManager */ public AbstractCompareViewerInformationControl(Shell parent, ToolBarManager toolBarManager) { super(parent, toolBarManager); // Create all controls create(); } private void initializeColors() { IPreferenceStore store = CUIPlugin.getDefault().getPreferenceStore(); RGB bgRGB; if (store.getBoolean(PreferenceConstants.EDITOR_SOURCE_HOVER_BACKGROUND_COLOR_SYSTEM_DEFAULT)) { bgRGB = SourceViewerInformationControl.getVisibleBackgroundColor(getShell().getDisplay()); } else { bgRGB = PreferenceConverter.getColor(store, PreferenceConstants.EDITOR_SOURCE_HOVER_BACKGROUND_COLOR); } if (bgRGB != null) { fBackgroundColor = new Color(getShell().getDisplay(), bgRGB); fIsSystemBackgroundColor = false; } else { fBackgroundColor = getShell().getDisplay().getSystemColor(SWT.COLOR_INFO_BACKGROUND); fIsSystemBackgroundColor = true; } } @Override protected void createContent(Composite parent) { initializeColors(); Composite content = new Composite(parent, SWT.NONE); final GridLayout gridLayout = new GridLayout(); gridLayout.marginWidth = 0; gridLayout.marginHeight = 0; gridLayout.verticalSpacing = 0; content.setLayout(gridLayout); if (hasHeader()) { createTitleLabel(content); } CompareConfiguration compareConfig = new CompareConfiguration(); compareConfig.setLeftEditable(false); compareConfig.setRightEditable(false); fCompareViewerControl = createCompareViewerControl(content, SWT.NONE, compareConfig); addDisposeListener(this); } protected CompareViewerControl createCompareViewerControl(Composite parent, int style, CompareConfiguration compareConfig) { CompareViewerControl compareViewer = new CompareViewerControl(parent, style, compareConfig); return compareViewer; } protected Viewer createContentViewer(Composite parent, ICompareInput input, CompareConfiguration cc) { return CompareUI.findContentViewer(null, input, parent, cc); } private void createTitleLabel(Composite parent) { fTitleLabel = new Label(parent, SWT.LEFT); fTitleLabel.setLayoutData(new GridData(GridData.FILL_HORIZONTAL)); Label separator = new Label(parent, SWT.SEPARATOR | SWT.HORIZONTAL); separator.setLayoutData(new GridData(GridData.FILL_HORIZONTAL)); fTitleLabel.setFont(JFaceResources.getDialogFont()); Display display = parent.getDisplay(); Color foreground = display.getSystemColor(SWT.COLOR_TITLE_FOREGROUND); Color background = display.getSystemColor(SWT.COLOR_TITLE_BACKGROUND); fTitleLabel.setForeground(foreground); fTitleLabel.setBackground(background); addMoveSupport(fTitleLabel); } public void setTitleText(String titleText) { if (fTitleLabel != null) { fTitleLabel.setText(titleText); } } /** * Returns the compare viewer. * * @return the compare viewer. */ protected final CompareViewerControl getCompareViewer() { return fCompareViewerControl; } /** * Returns the compare configuration. * * @return the compare configuration. */ protected final CompareConfiguration getCompareConfiguration() { return fCompareViewerControl.getCompareConfiguration(); } /** * Returns <code>true</code> if the control has a header, <code>false</code> otherwise. * <p> * The default is to return <code>false</code>. * </p> * * @return <code>true</code> if the control has a header */ protected boolean hasHeader() { // default is to have no header return false; } protected Color getBackgroundColor() { return fBackgroundColor; } @Override public void setInformation(String content) { } @Override public void setInput(Object input) { if (input instanceof ICompareInput) { fCompareInput = (ICompareInput) input; if (fCompareViewerControl != null) { fCompareViewerControl.setInput(fCompareInput); } } else if (input instanceof String) { // do nothing } else { fCompareInput = null; if (fCompareViewerControl != null) { fCompareViewerControl.setInput(fCompareInput); } } } @Override public void setVisible(boolean visible) { super.setVisible(visible); if (!visible) { setInput(null); } } @Override public void dispose() { if (!fIsSystemBackgroundColor) { fBackgroundColor.dispose(); } super.dispose(); } /** * {@inheritDoc} * @param event can be null * <p> * Subclasses may extend. * </p> */ @Override public void widgetDisposed(DisposeEvent event) { fCompareViewerControl = null; } @Override public boolean hasContents() { return fCompareViewerControl != null && fCompareInput != null; } @Override public Point computeSizeHint() { // compute the preferred size int x = SWT.DEFAULT; int y = SWT.DEFAULT; Point size = getShell().computeSize(x, y); Point constraints = getSizeConstraints(); if (constraints != null) { if (size.x < constraints.x) x = constraints.x; if (size.y < constraints.y) y = constraints.y; } // recompute using the constraints if the preferred size is smaller than the constraints if (x != SWT.DEFAULT || y != SWT.DEFAULT) size = getShell().computeSize(x, y, false); return size; } @Override public void setFocus() { super.setFocus(); fCompareViewerControl.setFocus(); } @Override public Rectangle computeTrim() { Rectangle trim = super.computeTrim(); addInternalTrim(trim); return trim; } /** * Adds the internal trimmings to the given trim of the shell. * * @param trim the shell's trim, will be updated * @since 5.0 */ private void addInternalTrim(Rectangle trim) { Rectangle textTrim = fCompareViewerControl.computeTrim(0, 0, 0, 0); trim.x += textTrim.x; trim.y += textTrim.y; trim.width += textTrim.width; trim.height += textTrim.height; if (fTitleLabel != null) { trim.height += fTitleLabel.computeSize(SWT.DEFAULT, SWT.DEFAULT).y; } } @Override public Point computeSizeConstraints(int widthInChars, int heightInChars) { Font font = JFaceResources.getFont(PreferenceConstants.EDITOR_TEXT_FONT); GC gc = new GC(fCompareViewerControl); gc.setFont(font); int width = gc.getFontMetrics().getAverageCharWidth(); int height = gc.getFontMetrics().getHeight(); gc.dispose(); return new Point(widthInChars * width, heightInChars * height); } @Override public IInformationControlCreator getInformationPresenterControlCreator() { return null; } protected final void addMoveSupport(final Control control) { MouseAdapter moveSupport = new MouseAdapter() { private MouseMoveListener fMoveListener; private final Control fShell = getShell(); @Override public void mouseDown(MouseEvent e) { Point shellLoc = fShell.getLocation(); final int shellX = shellLoc.x; final int shellY = shellLoc.y; Point mouseLoc = control.toDisplay(e.x, e.y); final int mouseX = mouseLoc.x; final int mouseY = mouseLoc.y; fMoveListener = new MouseMoveListener() { @Override public void mouseMove(MouseEvent e2) { Point mouseLoc2 = control.toDisplay(e2.x, e2.y); int dx = mouseLoc2.x - mouseX; int dy = mouseLoc2.y - mouseY; fShell.setLocation(shellX + dx, shellY + dy); } }; control.addMouseMoveListener(fMoveListener); } @Override public void mouseUp(MouseEvent e) { control.removeMouseMoveListener(fMoveListener); fMoveListener = null; } }; control.addMouseListener(moveSupport); } }